Fri, 04 Jul 2008 23:51:33 BST CiteULike: Tag microstrip http://www.citeulike.org/tag/microstrip CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/thmsdmstr/article/1429922 <i>IEEE Trans. Microw. Theory Tech., Vol. 42, No. 3. (1994), pp. 501-504.</i><br /><br />This paper combines the layered Green's function and bound charge technique to characterize the capacitance matrix in arbitrary two-dimensional geometries. When there exists no infinite ground plane, the authors enforce the constraint that the sum of all free charges is zero. When arbitrary dielectrics are sandwiched between two parallel ground planes, they numerically differentiate the integral of a closed-form parallel-plate Green's function. Both CPU time and storage are reduced as a result Two-dimensional capacitance calculation in stratified and/or arbitrary dielectric media CC Huang IEEE Trans. Microw. Theory Tech., Vol. 42, No. 3. (1994), pp. 501-504. 2007-07-03T05:42:27-00:00 1994 IEEE Trans. Microw. Theory Tech. 42 3 501 504 capacitance dielectric microstrip http://www.citeulike.org/user/thmsdmstr/article/1439937 <i>Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 9, No. 2. (1999), pp. 57-59.</i><br /><br />An improved quasi-static integral spectral domain analysis (SDA) for multistrips on a layered insulator-semiconductor substrate is proposed. This method of analysis significantly improves previous quasi-static SDA, accounting for the series resistance of the line in addition to the shunt conductance considered in the conventional quasi-TEM SDA. An excellent agreement with the full-wave analysis results is obtained with considerably less computation time Improved quasi-static spectral domain analysis of microstrip lines on high-conductivity insulator-semiconductor substrates J Aguilera R Marques M Horno Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 9, No. 2. (1999), pp. 57-59. 2007-07-06T19:41:47-00:00 1999 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters] 9 2 57 59 microstrip p_tmlm qtm sda semiconductor http://www.citeulike.org/user/mbolding/article/341062 <i>Magn Reson Med, Vol. 47, No. 3. (March 2002), pp. 579-593.</i><br /><br />The performance modeling of RF resonators at high magnetic fields of 4.7 T and more requires a physical approach that goes beyond conventional lumped circuit concepts. The treatment of voltages and currents as variables in time and space leads to a coupled transmission line model, whereby the electric and magnetic fields are assumed static in planes orthogonal to the length of the resonator, but wave-like along its longitudinal axis. In this work a multiconductor transmission line (MTL) model is developed and successfully applied to analyze a 12-element unloaded and loaded microstrip line transverse electromagnetic (TEM) resonator coil for animal studies. The loading involves a homogeneous cylindrical dielectric insert of variable radius and length. This model formulation is capable of estimating the resonance spectrum, field distributions, and certain types of losses in the coil, while requiring only modest computational resources. The boundary element method is adopted to compute all relevant transmission line parameters needed to set up the transmission line matrices. Both the theoretical basis and its engineering implementation are discussed and the resulting model predictions are placed in context with measurements. A comparison between a conventional lumped circuit model and this distributed formulation is conducted, showing significant departures in the resonance response at higher frequencies. This MTL model is applied to simulate two small-bore animal systems: one of 7.5-cm inner diameter, tuned to 200 MHz (4.7 T for proton imaging), and one of 13.36-cm inner diameter, tuned to both 200 and 300 MHz (7 T). Coupled microstrip line transverse electromagnetic resonator model for high-field magnetic resonance imaging. G Bogdanov R Ludwig Magn Reson Med, Vol. 47, No. 3. (March 2002), pp. 579-593. 2005-10-04T19:14:34-00:00 2002 Magn Reson Med 0740-3194 47 3 579 593 coil microstrip mri http://www.citeulike.org/user/lutful/article/1169090 <i></i><br /><br />antenna W slot B : Ls2 slot A : Ls1 L1 L2 rectangular patch ground plane feed line h1 h2 Sl Sf cross slot y x Fig. 1. Geometry of proximity-coupled microstrip antenna rectangular patch with cross slot feed line ground plane slot A : Ls1 slot B : Ls2 L1 L2 Sf Sl h2 h1 Wf y x REFERENCES Electromagnetically Coupled Rectangular Patch Microstrip Antenna for Circular Polarization Min Jung 2007-03-17T17:22:02-00:00 antenna microstrip http://www.citeulike.org/user/lanand/article/817799 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 28, No. 10. (1980), pp. 1139-1143.</i><br /><br />Green's functions are developed for the analysis of triangular segments in microwave planer circuits. Three types of triangles (30/spl deg/-60/spl deg/ right-angle, equilateral and isosceles right-angled) are treated by placing additional image sources outside the triangular region. Green's Functions For Triangular Segments In Planar Microwave Circuits R Chadha KC Gupta Microwave Theory and Techniques, IEEE Transactions on, Vol. 28, No. 10. (1980), pp. 1139-1143. 2006-08-26T06:26:57-00:00 1980 Microwave Theory and Techniques, IEEE Transactions on 28 10 1139 1143 greens microstrip planar triangular http://www.citeulike.org/user/lanand/article/817765 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 31, No. 6. (1983), pp. 949-955.</i><br /><br />Analysis and optimized designs are presented of three types of single feed circularly polarized microstrip antennas, namely, a diagonal fed nearly square, a truncated-corners square and a square with a diagonal slot. The Green's function approach and the desegmentation methods are used. The resonant frequencies are calculated for two orthogonal modes which together yield circular polarization. Optimum feed locations are determined for the best impedance match to a<tex>50 Omega</tex>coaxial feed line. Axial-ratio bandwidths, voltage standing-wave ratio (VSWR) bandwidths and radiation patterns are evaluated and verified experimentally. Analysis and optimized design of single feed circularly polarized microstrip antennas P Sharma K Gupta Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 31, No. 6. (1983), pp. 949-955. 2006-08-26T05:55:47-00:00 1983 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 31 6 949 955 cp greens microstrip segmentation http://www.citeulike.org/user/lanand/article/598555 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 39, No. 4. (1991), pp. 660-665.</i><br /><br />A Lagrangian approach is used to formulate the electromagnetic scattering properties of a linear microstrip resonator. The resonator design includes a center microstrip separated from the source and output loads by dielectric gaps. The gaps of the resonator are represented by capacitively coupled π-networks whereas the Lagrangian is formulated in the discrete limit such that the equations of motion transform into two boundary conditions, relating the waves on the two sides of the gap in terms of two lumped capacitors. The effective capacitors expressed in the boundary conditions are actually the capacitances experienced by the even and odd excitation modes of the system, respectively. The calculations, therefore take into account the characteristic impedance, effective dielectric constant, conductivity of the metal strip and the ground plane, and dielectric loss tangent of the dielectric material. In addition, the two capacitor values representing the gaps are included in a consistent manner with the above parameters by the application of the Lagrangian formulation. Calculated and measured reflection coefficients of linear microstrip resonators are compared, and general agreement is found between theory and experiments Lagrangian formulation of a linear microstrip resonator: theory and experiment H How A Widom C Vittoria Microwave Theory and Techniques, IEEE Transactions on, Vol. 39, No. 4. (1991), pp. 660-665. 2006-04-24T18:14:05-00:00 1991 Microwave Theory and Techniques, IEEE Transactions on 39 4 660 665 experiment lagrangian microstrip http://www.citeulike.org/user/lanand/article/817762 <i>Antennas and Propagation Society International Symposium, 1981, Vol. 19 (1981), pp. 19-22.</i> Segmentation and desegmentation techniques for analysis of planar microstrip antennas K Gupta P Sharma Antennas and Propagation Society International Symposium, 1981, Vol. 19 (1981), pp. 19-22. 2006-08-26T05:43:37-00:00 1981 Antennas and Propagation Society International Symposium, 1981 19 19 22 antenna microstrip planar segmentation http://www.citeulike.org/user/lanand/article/746099 <i>Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings, Vol. 2 (2005), 4 pp..</i><br /><br />Low cost of fabrication and low profile features of microstrip antennas, attract many researchers to investigate the performance of this antenna in various ways. Today, fractal antenna become popular among the researcher because they have a peculiar properties that make them suitable for multiband applications. Microstrip Sierpinski carpet antenna using transmission line feed is proposed for a multiband operation. Bandwidth up to 47% is being obtained at frequency 7.93 GHz. The cross polar isolation is between 10 to 15 dB. Microstrip Sierpinski carpet antenna using transmission line feeding MKA Rahim MZAA Aziz N Abdullah Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings, Vol. 2 (2005), 4 pp.. 2006-07-07T16:47:30-00:00 2005 Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings 2 4 pp. antenna microstrip sierpinski http://www.citeulike.org/user/lanand/article/828130 <i>Antennas and Propagation, IEEE Transactions on, Vol. 42, No. 1. (1994), pp. 110-112.</i><br /><br />The effective loss tangent (δ_eff) plays an important role in the improved cavity model of microstrip patch antennas. It is calculated using an iterative procedure. Results are presented here showing that the final value of δ_eff is quite sensitive to the value chosen at the start of the iterative process, i.e., the substrate loss tangent (tan δ). Since the input impedance depends on δ_eff, it is important to specify the value of tan δ in any comparison with experiment On the role of substrate loss tangent in the cavity model theory of microstrip patch antennas Kai-Fong Lee SR Chebolu Wei Chen RQ Lee Antennas and Propagation, IEEE Transactions on, Vol. 42, No. 1. (1994), pp. 110-112. 2006-09-05T03:31:05-00:00 1994 Antennas and Propagation, IEEE Transactions on 42 1 110 112 antenna cavity loss microstrip substrate tangent http://www.citeulike.org/user/dcastro/article/2622808 <i>Antennas and Propagation Magazine, IEEE, Vol. 45, No. 1. (2003), pp. 120-122.</i><br /><br />The cavity-model expression for the directivity of a circular microstrip-patch antenna is revisited. The directivity is determined, without approximations, in different formats, one of which leads to easily computable results involving rapidly convergent series of Bessel functions. Circular microstrip-patch directivity revisited: an easily computable exact expression JD Mahony doi:10.1109/MAP.2003.1189657 Antennas and Propagation Magazine, IEEE, Vol. 45, No. 1. (2003), pp. 120-122. 2008-04-02T09:28:26-00:00 2003 Antennas and Propagation Magazine, IEEE 45 1 120 122 antenna circular directivity microstrip patch http://www.citeulike.org/user/dcastro/article/2836664 <i>Antennas and Propagation, IEEE Transactions on, Vol. 36, No. 3. (1988), pp. 309-321.</i><br /><br />For circular microstrip antennas, single-mode design techniques work well for the dominant mode (<e1>n</e1>=1, where <e1>n</e1> is the azimuthal dependence of the fields in the antenna), but this is not the case for zero-order (<e1>n</e1>=0) and higher order (<e1>n</e1>>1) modes, where a modal expansion is necessary. The design of higher order dominant mode circular microstrip antennas is addressed, with an example and measurements for the <e1>n</e1>=3 case. Measurements for the <e1>n </e1>=3 modes show reasonable agreement with theory in the forms of the impedance loci, but the frequency dependence is in error by the order of the bandwidth of the antenna. A design example is given for a roof-mounted circular patch for vehicular communications. The example indicates that an <e1>n</e1>=3 dominant mode patch can be used as a two-port antenna for diversity applications or with a 90° phase shifter and adder as a single-port antenna for omnidirectional coverage with (essentially) circular polarization Two-port higher mode circular microstrip antennas RG Vaughan doi:10.1109/8.192112 Antennas and Propagation, IEEE Transactions on, Vol. 36, No. 3. (1988), pp. 309-321. 2008-05-27T07:10:49-00:00 1988 Antennas and Propagation, IEEE Transactions on 36 3 309 321 antenna circular microstrip mode http://www.citeulike.org/user/dcastro/article/2836660 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 22, No. 10. (1974), pp. 857-864.</i><br /><br />A simple method is described to calculate the capacitances of rectangular and circular microstrip disk capacitors. From the edge capacitances of the capacitors the influence of the fringing field on the resonance frequencies of microstrip disk resonators is calculated. A theory to compute the resonance frequencies of microstrip resonators with high accuracy is presented. The resonance frequencies are calculated from a resonator model employing an effective width and length or radius, respectively, filled with a medium of a "dynamic dielectric constant." Theoretical and experimental results are compared and found to be in agreement within 1 percent. Rectangular and Circular Microstrip Disk Capacitors and Resonators I Wolff N Knoppik Microwave Theory and Techniques, IEEE Transactions on, Vol. 22, No. 10. (1974), pp. 857-864. 2008-05-27T07:08:23-00:00 1974 Microwave Theory and Techniques, IEEE Transactions on 22 10 857 864 capacitor microstrip http://www.citeulike.org/user/dcastro/article/2674550 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 29, No. 1. (1981), pp. 25-37.</i><br /><br />Past and present technological developments in microstrip antenna arrays are summarized. Emphasis is on exploring the potential of such arrays for satisfying the requirements of advanced military and commercial applications. Microstrip array technology R Mailloux J Mcilvenna N Kernweis Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 29, No. 1. (1981), pp. 25-37. 2008-04-15T17:50:49-00:00 1981 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 29 1 25 37 antenna array microstrip http://www.citeulike.org/user/dcastro/article/2836659 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 31, No. 5. (1983), pp. 740-747.</i><br /><br />Calculated data are presented on the performance of printed antenna elements on substrates which may be electrically thick, as would be the case for printed antennas at millimeter wave frequencies. Printed dipoles and microstrip patch antennas on polytetrafluoroethylene (PTFE), quartz, and gallium arsenide substrates are considered. Data are given for resonant length, resonant resistance, bandwidth, loss due to surface waves, loss due to dielectric heating, and mutual coupling. Also presented is an optimization procedure for maximizing or minimizing power launched into surface waves from a multielement printed antenna array. The data are calculated by a moment method solution. Considerations for millimeter wave printed antennas D Pozar Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 31, No. 5. (1983), pp. 740-747. 2008-05-27T07:08:17-00:00 1983 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 31 5 740 747 antenna microstrip printed http://www.citeulike.org/user/dcastro/article/2674538 <i>Proceedings of the IEEE, Vol. 80, No. 1. (1992), pp. 79-91.</i><br /><br />Microstrip antennas have been one of the most innovative topics in antenna theory and design in recent years, and are increasingly finding application in a wide range of modern microwave systems. This paper begins with a brief overview of the basic characteristics of microstrip antennas, and then concentrates on the most significant developments in microstrip antenna technology that have been made in the last several years. Emphasis is on new antenna configurations for improved electrical performance and manufacturability and on advances in the analytical modeling of microstrip antennas and arrays Microstrip antennas DM Pozar doi:10.1109/5.119568 Proceedings of the IEEE, Vol. 80, No. 1. (1992), pp. 79-91. 2008-04-15T17:50:30-00:00 1992 Proceedings of the IEEE 80 1 79 91 antenna microstrip patch http://www.citeulike.org/user/dcastro/article/2836658 <i>European Microwave Conference, 1975. 5th (1975), pp. 268-272.</i><br /><br />A method for determining the accuracy of computed impedance and wavelength data for microstrip is proposed. It is shown that the standard equations of Wheeler and Schneider have rather large errors. Revised equations for microstrip impedance and wavelength are given both for analysis and synthesis with accuracy better than 1%. A simple, accurate equation for the microstrip open circuit is presented. Experimental data on microstrip T-junctions are compared with existing theories. A new accurate equation is given for the reference plane displacement in the stub arm. Corrections are proposed in the existing equations for the other parameters of the equivalent circuit. Equations for Microstrip Circuit Design Erik Hammerstad doi:10.1109/EUMA.1975.332206 European Microwave Conference, 1975. 5th (1975), pp. 268-272. 2008-05-27T07:08:15-00:00 1975 European Microwave Conference, 1975. 5th 268 272 circuit design microstrip http://www.citeulike.org/user/dcastro/article/2768644 <i>Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480), Vol. 1 (2001), pp. 86-89 vol.1.</i><br /><br />Photonic band gap (PBG) structures are applied into the design of microstrip diplexer patch antenna at millimetre wave frequencies to enhance the isolation between Tx and Rx ports. Theoretical results indicate that the isolation can be improved and measurement results are to be presented Isolation enhancement of PBG microstrip diplexer patch antenna Y Hao CG Parini Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480), Vol. 1 (2001), pp. 86-89 vol.1. 2008-05-08T06:36:03-00:00 2001 Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480) 1 86 89 vol.1 antenna diplexer isolation microstrip patch pbg http://www.citeulike.org/user/dcastro/article/2836657 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 27, No. 6. (1979), pp. 846-849.</i><br /><br />An extended theory on rectangular microstrip resonator antennas is presented using the cavity model. Radiation from all four edges of the open cavity is taken into account as well as dielectric and ohmic losses. For a rectangular microstrip antenna excited in its lowest resonance mode, losses, input conductance, and bandwidth are calculated and plotted versus frequency for some different parameters, showing that bandwidths of up to 15 percent (for a voltage standing-wave ratio (VSWR) of less than two) are possible to achieve in the<tex>X</tex>band. Extended analysis of rectangular microstrip resonator antennas A Derneryd A Lind Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 27, No. 6. (1979), pp. 846-849. 2008-05-27T07:08:05-00:00 1979 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 27 6 846 849 antenna microstrip resonator http://www.citeulike.org/user/dcastro/article/2836656 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 25, No. 4. (1977), pp. 595-596.</i><br /><br />The resonant frequency is obtained in analytical form for a planar, circular disc antenna which is etched on a printed-circuit board so that the low-profile antenna is separated from the ground plane only by a thin layer of dielectric material. The formula is found to have an error of less than 2.5 percent when compared with experimental data. Resonant frequency of a circular disc, printed-circuit antenna L Shen S Long M Allerding M Walton Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 25, No. 4. (1977), pp. 595-596. 2008-05-27T07:08:04-00:00 1977 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 25 4 595 596 antenna circular frequency microstrip patch http://www.citeulike.org/user/dcastro/article/2801358 <i>Microwave and Wireless Components Letters, IEEE, Vol. 12, No. 1. (2002), pp. 18-19.</i><br /><br />A compact circularly polarized subdivided microstrip patch antenna is proposed. The antenna is composed of the interconnection of four corner patches alternating with four strips and a fifth central patch. It presents the very small size of 0.28λ_g by 0.28λ_g at resonance (5.85 GHz), which represents a surface reduction of 60% compared with a conventional microstrip square patch antenna. The proposed antenna exhibits a gain of 4.3 dBi to 5 dBi and an axial ratio lower than 1.8 dB in the range of its bandwidth, which is of 30 MHz A compact circularly polarized subdivided microstrip patch antenna Ji-Yong Park C Caloz Yongxi Qian T Itoh doi:10.1109/7260.975721 Microwave and Wireless Components Letters, IEEE, Vol. 12, No. 1. (2002), pp. 18-19. 2008-05-15T11:28:53-00:00 2002 Microwave and Wireless Components Letters, IEEE 12 1 18 19 antenna circular compact microstrip patch polarisation http://www.citeulike.org/user/dcastro/article/1992139 <i>Microwave Symposium Digest, 1993., IEEE MTT-S International (1993), pp. 889-892 vol.2.</i><br /><br />A comprehensive approach to microwave filter design which exploits accurate filed simulations driven directly by a gradient-based minimax optimizer is presented. Challenges of efficiency, discretization of geometrical dimensions, and continuity of optimization variables are reconciled by a three-stage attack: (1) efficient response interpolation; (2) smooth gradient estimation; and (3) dynamic database updating. The design optimization of two microstrip filters illustrates the technique described.<<ETX>> Minimax microstrip filter design using direct EM field simulation JW Bandler S Ye RM Biernacki SH Chen DG Swanson Microwave Symposium Digest, 1993., IEEE MTT-S International (1993), pp. 889-892 vol.2. 2007-11-27T10:27:34-00:00 1993 Microwave Symposium Digest, 1993., IEEE MTT-S International 889 892 vol.2 design filter microstrip simulation http://www.citeulike.org/user/dcastro/article/2768634 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 52, No. 5. (2004), pp. 1425-1432.</i><br /><br />This paper presents multifunctional microstrip transmission lines for designing a high port-isolation dual-frequency orthogonally polarized rectangular patch antenna and the antenna-integrated power amplifier. The proposed lines were realized through the integration of defected ground structures (DGSs) with conventional microstrip lines. A spiral-shaped DGS-integrated microstrip line enhances the port isolation of the antenna, while feeding the 2.0-GHz excitation to the antenna and filtering out the 2.5-GHz receiving signal from the other port. High-order harmonic signal suppression of the power amplifier at the 2.5-GHz port was accomplished by the dumbbell-shaped DGS, thereby improving the efficiency of the amplifier. Measurements show an improvement of 20 dB in port isolation and 3% in power-added efficiency relative to an identical RF front-end, but integrated with a conventional patch antenna. An image impedance of the DGS-integrated microstrip lines can be controlled by the integrated DGS geometries. Relatively high-impedances lines, i.e., 150 and 100 /spl Omega/, are effectively implemented using microstrip lines with 75- and 50-/spl Omega/ linewidths by incorporating the spiral- and dumbbell-shaped DGSs, respectively. Multifunctional microstrip transmission lines integrated with defected ground structure for RF front-end application Younkyu Chung Seong-Sik Jeon Shinho Kim D Ahn Jae-Ick Choi T Itoh doi:10.1109/TMTT.2004.827013 Microwave Theory and Techniques, IEEE Transactions on, Vol. 52, No. 5. (2004), pp. 1425-1432. 2008-05-08T06:29:01-00:00 2004 Microwave Theory and Techniques, IEEE Transactions on 52 5 1425 1432 front-end microstrip tl http://www.citeulike.org/user/dcastro/article/2067674 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 55, No. 9. (2007), pp. 1926-1934.</i><br /><br /><para> A new method for designing the microstrip branch-line couplers with predetermined compact size and bandwidth is proposed in this paper. With the proposed approach, the size of the quarter-wavelength transmission line in the branch-line coupler can be reduced greatly. In addition, the proposed couplers can be easily fabricated on the printed circuit board without any lumped element. A chart concludes the relationship between bandwidth and size reduction rate. It shows that open stubs with low impedance perform better than those with high impedance; moreover, the more open stubs with low impedance utilized, the broader the bandwidth will be. Furthermore, the measured frequency responses show good agreement with the theoretical results. </para> Synthesizing Microstrip Branch-Line Couplers With Predetermined Compact Size and Bandwidth CW Tang MG Chen Microwave Theory and Techniques, IEEE Transactions on, Vol. 55, No. 9. (2007), pp. 1926-1934. 2007-12-06T16:52:53-00:00 2007 Microwave Theory and Techniques, IEEE Transactions on 55 9 1926 1934 bandwidth branch-line coupler microstrip http://www.citeulike.org/user/dcastro/article/2836653 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 26, No. 4. (1978), pp. 532-535.</i><br /><br />A theoretical treatment of the rectangular microstrip radiating element has been performed. The element has been modeled as a line resonator with radiation taking place at the open-circuited ends. This has been verified by using a liquid crystal visual detector. With the simplified model, the input impedance and the far fields have been calculated for different resonant modes. The interaction between the radiating ends will effect the input impedance, and this has been considered by defining a mutual conductance. Also, a mutual conductance between microstrip elements has been expressed in far-field quantities and plotted as a function of spacing along the<tex>E</tex>- and<tex>H</tex>- planes. The directivity of an isolated element has been calculated as the directivity of one radiating end times the contribution due to the array factor. A theoretical investigation of the rectangular microstrip antenna element A Derneryd Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 26, No. 4. (1978), pp. 532-535. 2008-05-27T07:07:05-00:00 1978 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 26 4 532 535 antenna microstrip http://www.citeulike.org/user/dcastro/article/2067672 <i>Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 8. (2005), pp. 519-520.</i><br /><br />We introduce a branch-line coupler using discontinuous microstrip lines whose size is significantly reduced relative to the standard design. We manipulate the reactive characteristics of discontinuities in its microstrip lines to achieve a physical size reduction of almost 60% with comparable performance. A compact branch-line coupler using discontinuous microstrip lines Kae-Oh Sun Sung-Jin Ho Chih-Chuan Yen D van der Weide Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 8. (2005), pp. 519-520. 2007-12-06T16:52:26-00:00 2005 Microwave and Wireless Components Letters, IEEE 15 8 519 520 branch-line compact coupler microstrip http://www.citeulike.org/user/dcastro/article/2836652 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 23, No. 1. (1975), pp. 90-93.</i><br /><br />Microstrip antennas consist of a planar resonant radiating element parallel to, but separated, from a ground plane by a thin dielectric substrate (<tex>t ll lambda</tex>). These antennas are very thin and consequently rugged and easy to mount. They may be fed from the back through the ground plane or from the edge by depositing microstrip lines on the dielectric substrate. Several varieties of microstrip antennas are discussed in this paper. Design procedures are given for both linearly and circularly polarized antennas. Measured patterns are presented for antennas from UHF through<tex>C</tex>band. Microstrip antennas J Howell Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 23, No. 1. (1975), pp. 90-93. 2008-05-27T07:06:58-00:00 1975 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 23 1 90 93 antenna microstrip http://www.citeulike.org/user/dcastro/article/2836651 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 29, No. 1. (1981), pp. 47-53.</i><br /><br />The method of moments is used to analyze microstrip antennas of rectangular and nonrectangular shape. Surface currents are used to model the microstrip patch and volume polarization currents for the dielectric slab. The method requires unusually precise computation of the impedance matrix but is capable of accurately predicting currents, impedance, and resonant frequency of the antenna. Analysis of microstrip antennas using moment methods E Newman P Tulyathan Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 29, No. 1. (1981), pp. 47-53. 2008-05-27T07:06:58-00:00 1981 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 29 1 47 53 antenna microstrip mom http://www.citeulike.org/user/dcastro/article/2836648 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 22, No. 1. (1974), pp. 74-78.</i><br /><br />A new class of antennas using microstrips to form the feed networks and radiators is presented in this communication. These antennas have four distinct advantages: 1) cost, 2) performance, 3) ease of installation, and 4) the low profile conformal design. The application of these antennas is limited to small bandwidths. Phased arrays using these techniques are also discussed. Conformal microstrip antennas and microstrip phased arrays R Munson Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 22, No. 1. (1974), pp. 74-78. 2008-05-27T07:06:32-00:00 1974 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 22 1 74 78 antenna array microstrip phased http://www.citeulike.org/user/dcastro/article/2801353 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 12. (1999), pp. 2562-2567.</i><br /><br />A novel microstrip-to-waveguide transition utilizing a coplanar-strip Yagi-like antenna is presented. The compact and single-layered quasi-Yagi antenna fabricated on high dielectric-constant substrate has end-fire radiation patterns. This monolithic-microwave integrated-circuit (MMIC)-compatible antenna is inserted in the E-plane of the rectangular waveguide to launch the TE₁₀ dominant mode. With this new scheme of excitation, compact design and low-cost fabrication is achieved without requiring multilayered substrate or backshort hermetic sealing. This transition, in addition, achieves very broad bandwidth and relatively low insertion loss. The transition's broad-band characteristics are analyzed, and optimization guidelines for individual components of the transition are discussed in detail. A tolerance study proves that the transition is robust in mechanical alignment. The X-band transition with alumina substrate demonstrates 35% bandwidth with return loss better than -12- and -0.3-dB insertion loss at the center frequency. This transition should find wide applications due to its high compatibility with microwave-integrated-circuit/MMIC technology and very low fabrication cost A broad-band microstrip-to-waveguide transition using quasi-Yagi antenna N Kaneda Y Qian T Itoh doi:10.1109/22.809007 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 12. (1999), pp. 2562-2567. 2008-05-15T11:25:48-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 12 2562 2567 antenna broadband microstrip http://www.citeulike.org/user/dcastro/article/2774537 <i>Microwaves, Antennas & Propagation, IET, Vol. 2, No. 1. (2008), pp. 1-5.</i> Computation of resonant frequency of annular microstrip antenna loaded with multiple shorting posts M Mahajan SK Khah T Chakarvarty A De doi:10.1049/iet-map:20070057 Microwaves, Antennas & Propagation, IET, Vol. 2, No. 1. (2008), pp. 1-5. 2008-05-09T06:48:22-00:00 2008 Microwaves, Antennas & Propagation, IET 2 1 1 5 antenna circular frequency microstrip ring shorted http://www.citeulike.org/user/dcastro/article/2674447 <i>Antennas and Propagation, IEEE Transactions on, Vol. 37, No. 11. (1989), pp. 1345-1354.</i><br /><br />The nature of the inherent narrow bandwidth of conventional microstrip patch antennas is considered. It is observed that, except for single-feed circularly polarized elements, their bandwidth is limited only by the resonant behavior of the input impedance and not by radiation pattern or gain variations, which usually are negligible over a moderate 10 to 20% bandwidth. Therefore, broadband impedance matching is proposed as a natural to increase the bandwidth. The maximum obtainable bandwidth is calculated using Fano's broadband matching theory. It is found that by using an optimally designed impedance-matching network, the bandwidth can be increased by a factor of at least 3.9, the exact value depending on the degree of matching required. A transmission-line prototype for a proper matching network is developed. The translation of this prototype network into a practical structure (e.g. a microstrip or stripline circuit) is considered. Practical design examples and experimental results which clearly show the validity of the technique are given An impedance-matching technique for increasing the bandwidth of microstrip antennas HF Pues AR Van de Capelle doi:10.1109/8.43553 Antennas and Propagation, IEEE Transactions on, Vol. 37, No. 11. (1989), pp. 1345-1354. 2008-04-15T17:46:22-00:00 1989 Antennas and Propagation, IEEE Transactions on 37 11 1345 1354 antenna bandwidth impedance microstrip patch http://www.citeulike.org/user/dcastro/article/2836647 <i>Antennas and Propagation, IEEE Transactions on, Vol. 37, No. 6. (1989), pp. 677-682.</i><br /><br />A set of measurements of patch antennas on substrates of varying thickness and permittivity, using three types of feeds, is presented. Resonant frequency and resonant resistance are compared with calculated values from the representative theories. The measurements show that erratic results may be obtained for substrates thicker than about 0.02 λ₀, where λ₀ is the free-space wavelength at the resonant frequency. These problems may be related to coax-to-microstripline transitions, but their cause is not yet definitely known. The theoretical models that are compared give reasonably good results for resonant frequency, but none give impedance results that are consistently reliable. It thus appears that further work is needed to develop analytical models that can adequately predict the impedance performance of microstrip antennas on thick and/or high dielectric constant substrates Effect of microstrip antenna substrate thickness and permittivity: comparison of theories with experiment DH Schaubert DM Pozar A Adrian doi:10.1109/8.29353 Antennas and Propagation, IEEE Transactions on, Vol. 37, No. 6. (1989), pp. 677-682. 2008-05-27T07:05:53-00:00 1989 Antennas and Propagation, IEEE Transactions on 37 6 677 682 antenna microstrip patch http://www.citeulike.org/user/dcastro/article/2768628 <i>Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 1561-1564.</i> Microstrip filters and diplexers for WiMAX applications Damir Zayniyev Djuradj Budimir George Zouganelis doi:10.1109/APS.2007.4395806 Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 1561-1564. 2008-05-08T06:28:46-00:00 2007 Antennas and Propagation International Symposium, 2007 IEEE 1561 1564 diplexer filter microstrip wimax http://www.citeulike.org/user/dcastro/article/2768629 <i>Communications, Circuits and Systems, 2005. Proceedings. 2005 International Conference on, Vol. 2 (2005)</i><br /><br />A simple microstrip diplexer using defected ground structure (DGS) is described in this letter. The diplexer has been designed, fabricated, and measured. Results show the new diplexer exhibits an isolation of greater than 26 dB between channels. A novel microstrip diplexer design using defected ground structure Haiwen Liu T Yoshimasu S Kurachi Jia Chen Zhengfan Li Xiaowei Sun doi:10.1109/ICCCAS.2005.1495297 Communications, Circuits and Systems, 2005. Proceedings. 2005 International Conference on, Vol. 2 (2005) 2008-05-08T06:28:47-00:00 2005 Communications, Circuits and Systems, 2005. Proceedings. 2005 International Conference on 2 1100 desing diplexer microstrip pbg http://www.citeulike.org/user/dcastro/article/2774536 <i>Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480), Vol. 1 (2001), pp. 28-32 vol.1.</i><br /><br />Dual-frequency operation of microstrip antennas have been studied to some extent by many researchers. Until now, however, there have been little attention to the integration these type of microstrip antennas with active circuits to perform what we call dual-frequency operation, although this integration is already known to increase the performance of the microstrip antenna. This paper describes the design and construction of a dual-frequency operation active microstrip antenna that includes the integration of circular ring concentric patch microstrip antenna with a microwave oscillator and amplifier Dual-frequency operation of active concentric circular ring microstrip antenna ET Rahardjo M Hadimargono Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480), Vol. 1 (2001), pp. 28-32 vol.1. 2008-05-09T06:48:19-00:00 2001 Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480) 1 28 32 vol.1 active antenna circular dual-band microstrip ring http://www.citeulike.org/user/dcastro/article/1992126 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 12. (2001), pp. 2322-2330.</i><br /><br />Novel reduced-size lumped-element uniplanar transitions are proposed, using the planar parallel and series inductor-capacitor (LC) circuits to realize the effective open and short circuits, respectively. In this study, various compact lumped-element coplanar waveguide-to-slotline and finite-ground coplanar waveguide-to-coplanar stripline transition structures are developed and carefully examined. Specifically, the performance of proposed basic lumped-element transitions can easily be adjusted through the control of L and C values, while the design of lumped-element Marchand-balun-type transitions may be accomplished by the use of conventional filter synthesis techniques. Simple equivalent-circuit models are also established, from which the passband behavior of the lumped-element transition structures may be characterized Novel lumped-element uniplanar transitions Yo-Shen Lin Chun Chen Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 12. (2001), pp. 2322-2330. 2007-11-27T10:26:14-00:00 2001 Microwave Theory and Techniques, IEEE Transactions on 49 12 2322 2330 circuit lumped microstrip http://www.citeulike.org/user/dcastro/article/2801349 <i>Antennas and Propagation Magazine, IEEE, Vol. 36, No. 1. (1994), pp. 16-19.</i><br /><br />The author discusses class-C FET/patch oscillators; in these, the microstrip-patch antenna serves multiple purposes: the patch radiates energy, acts as a resonant load, and as a feedback network. These integrated antenna/oscillators are capable of efficiencies which approach conventional non-radiating oscillator designs High-efficiency FET/microstrip-patch oscillators RD Martinez RC Compton doi:10.1109/74.262628 Antennas and Propagation Magazine, IEEE, Vol. 36, No. 1. (1994), pp. 16-19. 2008-05-15T11:25:35-00:00 1994 Antennas and Propagation Magazine, IEEE 36 1 16 19 efficiency fet high microstrip oscillator patch http://www.citeulike.org/user/dcastro/article/2768627 <i>Electronics Letters, Vol. 41, No. 14. (2005), pp. 810-811.</i><br /><br />A new topology for the design of microstrip microwave diplexers, based on the use of quasi-lumped resonators, is presented. Specifically, the receiver (Rx) and transmitter (Tx) filters of the diplexer are implemented by etching complementary split ring resonators (CSRRs) in the ground plane as well as series capacitive gaps and shunt inductive strips in the upper metal level. By this means, narrowband microwave diplexers with transmission zeros can be synthesised, which allow for the improvement of Rx/Tx isolation. A prototype device operative in the 2.4-3.0 GHz frequency band is presented. Measured insertion losses are lower than 2 dB while the isolation between Rx/Tx channels is in the vicinity of 40 dB. Diplexer dimensions (29.8/spl times/16.3 mm), which are small on account of the semi-lumped resonators employed, and performance point to the practical application of these structures in communication transceiver front-ends. Complementary split ring resonators for microstrip diplexer design J Bonache I Gil J Garcia-Garcia F Martin doi:10.1049/el:20050895 Electronics Letters, Vol. 41, No. 14. (2005), pp. 810-811. 2008-05-08T06:28:27-00:00 2005 Electronics Letters 41 14 810 811 diplexer microstrip resonator ring http://www.citeulike.org/user/dcastro/article/2774533 <i>Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st, Vol. 2 (2000), pp. 1386-1389 vol.2.</i><br /><br />An active microstrip antenna for the satellite communication is developed. A varactor-tuned oscillator HEMT VCO, an active source, integrates with an X-band two-terminal asymmetrically feeding microstrip leaky-wave antenna on the same plane. This approach creates a dual-beam radiation pattern and has the advantages of multi-direction and suppression of the reflected wave caused by the open end of the radiating element, as compared to a traditionally single-terminal feeding leaky-wave antenna. Measured results on the experimental antenna show that the total scanning angle of two beams of this antenna configuration is approximately 44°. The maximum effective isotropic radiated power (EIRP) are close to 17.5 dBm for the right beam and 16.67 dBm for the left beam at 10.4 GHz, and the power difference between the two beams is less than 1 dB. An asymmetrically beam-scanning leaky-wave antenna is also shown An active microstrip antenna for satellite communication Chien-Jen Wang CF Jou Jin-Jei Wu Song-Tsuen Peng doi:10.1109/VETECS.2000.851352 Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st, Vol. 2 (2000), pp. 1386-1389 vol.2. 2008-05-09T06:47:51-00:00 2000 Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st 2 1386 1389 vol.2 active antenna communication microstrip satellite http://www.citeulike.org/user/dcastro/article/2782059 <i>Electronics Letters, Vol. 30, No. 22. (1994), pp. 1861-1862.</i><br /><br />A novel ring resonator topology was developed which exhibits mode suppression characteristics. The resonator achieves the mode suppression by incorporation of a stepped impedance lowpass filter directly into the ring resonator. Experimental results show that complete suppression of a ring resonator's second mode can be achieved with no increase in circuit size. The topology effectively increases the rejection bandwidth of the ring resonator Microstrip mode suppression ring resonator JM Carroll K Chang Electronics Letters, Vol. 30, No. 22. (1994), pp. 1861-1862. 2008-05-10T00:01:38-00:00 1994 Electronics Letters 30 22 1861 1862 microstrip resonator http://www.citeulike.org/user/dcastro/article/2768626 <i>Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 4. (2005), pp. 268-270.</i><br /><br />A compact wideband high-rejection microstrip bandstop filter (BSF) is presented. This filter combines two traditional BSFs: open-stub filter and spurline filter. Due to the inherently compact characteristics of the spurline, the proposed filter shows a better rejection performance than open-stub BSF without increasing the circuit size. From 3.7 to 5.4 GHz, the proposed BSF has a rejection of better than 20 dB and the maximum rejection level of 61 dB. Application of this BSF to suppress the second harmonic of an open-loop ring bandpass filter is also investigated with a 40-dB suppression improvement achieved. Compact microstrip bandstop filter using open stub and spurline Wen-Hua Tu Kai Chang doi:10.1109/LMWC.2005.845739 Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 4. (2005), pp. 268-270. 2008-05-08T06:28:24-00:00 2005 Microwave and Wireless Components Letters, IEEE 15 4 268 270 compact filter microstrip http://www.citeulike.org/user/dcastro/article/2768625 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 10. (2001), pp. 1818-1820.</i><br /><br />This paper introduces a three-port microstrip multifrequency diplexer used in a phased-array transceiver system that employs band-stop filters with open-circuited stubs for band selection and separation. The diplexer is designed to take 10, 12, 19, and 21 GHz into port 1 and to separate 10 and 19 GHz to port 2 and 12 and 21 GHz to part 3 with minimal dispersion. The insertion loss for each frequency varies from 0.4 to 3.4 db and the return loss is better than 10 dB. The isolation between channels at the four frequencies is greater than 50 dB. Each passband created between adjacent stopbands has a bandwidth over 1 GHz. The microstrip diplexer is designed using periodic stubs that collectively have the advantages of low insertion loss, high isolation and rejection, wide-band performance on each channel, and easy fabrication. This type of diplexer has many applications in multifrequency transceivers for communication systems Wide-band low-loss high-isolation microstrip periodic-stub diplexer for multiple-frequency applications B Strassner K Chang doi:10.1109/22.954789 Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 10. (2001), pp. 1818-1820. 2008-05-08T06:28:18-00:00 2001 Microwave Theory and Techniques, IEEE Transactions on 49 10 1818 1820 diplexer frequency high isolation loss low microstrip multiple wideband http://www.citeulike.org/user/dcastro/article/2776196 <i>Microwave Symposium Digest, 2004 IEEE MTT-S International, Vol. 3 (2004), pp. 1311-1314 Vol.3.</i><br /><br />This paper presents a lowpass microstrip filter employing metal-loaded slots etched in the ground plane. The filter exhibits a superior RF performance in comparison with low pass filters that are based on electromagnetic band gap (EBG) structures. Several metal-loaded slot configurations have been proposed and theoretically investigated. A lowpass microstrip filter employing one of these slots is built and tested. The measured results are in good agreement with simulation demonstrating the validity of the proposed concept. A novel lowpass microstrip filter using metal-loaded slots in the ground plane R Zhang RR Mansour doi:10.1109/MWSYM.2004.1338807 Microwave Symposium Digest, 2004 IEEE MTT-S International, Vol. 3 (2004), pp. 1311-1314 Vol.3. 2008-05-09T15:46:49-00:00 2004 Microwave Symposium Digest, 2004 IEEE MTT-S International 3 1311 1314 Vol.3 filter microstrip http://www.citeulike.org/user/dcastro/article/1992111 <i>Microwave Symposium Digest, 1998 IEEE MTT-S International, Vol. 3 (1998), pp. 1755-1758 vol.3.</i><br /><br />A general-purpose CAD-oriented circuit model is presented for accurately modeling interdigital capacitor (IDC) in optimized design of low-loss IDC-related microstrip circuits. This equivalent model is formulated as an admittance-based π-network through the use of a so-called “Short-Open Calibration (SOC)” technique for extracting precisely circuit parameters from a fullwave method of moments (MoM). A J-inverter based topology is further developed for explicit characterization of IDC-related coupling characteristics that accounts for frequency dispersion and fringing effect. Extracted model parameters are given for two types of IDC structure and the model accuracy is well validated by our experiments for an IDC-related quasi-lumped bandpass filter A general-purpose circuit model of interdigital capacitor for accurate design of low-loss microstrip circuit Lei Zhu Ke Wu Microwave Symposium Digest, 1998 IEEE MTT-S International, Vol. 3 (1998), pp. 1755-1758 vol.3. 2007-11-27T10:24:18-00:00 1998 Microwave Symposium Digest, 1998 IEEE MTT-S International 3 1755 1758 vol.3 capacitor circuit interdigital microstrip model http://www.citeulike.org/user/dcastro/article/2774525 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 10. (2000), pp. 1765-1768.</i><br /><br />An unique aspect of the injection-locked active microstrip antenna incorporating a Gunn diode, i.e., the variation of the device current within the lock band, is exploited for the demodulation of an FM microwave signal. A simple experimental arrangement has been presented to demonstrate the demodulation performance of the receiver even in a multichannel environment. Using two such separate antennas as transmitter and receiver, a two-way short-range communication system has been demonstrated that may be suited for certain commercial and military applications A novel scheme for reception using an active microstrip antenna BN Biswas A Bhattacharya P Lahiri D Mondal doi:10.1109/22.873908 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 10. (2000), pp. 1765-1768. 2008-05-09T06:44:41-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 10 1765 1768 active antenna microstrip receiver http://www.citeulike.org/user/dcastro/article/1870043 <i>Microwave and Wireless Components Letters, IEEE, Vol. 13, No. 4. (2003), pp. 155-157.</i><br /><br />We present the complete band structure of a negative refractive index metamaterial based on the concept of dual transmission lines. The metamaterial is a two-dimensional (2-D) microstrip periodic structure that has cell dimensions much smaller than the wavelength of operation. It can therefore be considered as an effective medium. First, the dispersion characteristics of the metamaterial are explained by way of a 2-D loaded transmission line representation. Subsequently, full-wave analysis is utilized to reveal additional modes that can be excited in the metamaterial. Dispersion analysis of a microstrip-based negative refractive index periodic structure A Grbic GV Eleftheriades Microwave and Wireless Components Letters, IEEE, Vol. 13, No. 4. (2003), pp. 155-157. 2007-11-05T20:31:12-00:00 2003 Microwave and Wireless Components Letters, IEEE 13 4 155 157 metamaterial microstrip periodic structure http://www.citeulike.org/user/dcastro/article/2187934 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 33, No. 4. (1985), pp. 369-374.</i><br /><br />Input impedance and bandwidth of an annular ring microstrip antenna have been determined by modeling the antenna as a section of radial line loaded with wall admittances. The effect of mutual coupling between the radiating apertures has been taken into account. The theoretically calculated values of input impedance for TM<inf>12</inf>-mode are compared with measurements. The agreement is good. Higher order modes have been found to be present in the vicinity of TM<inf>12</inf>-mode. The reactance due to these modes can be utilized to increase the voltage standing-wave ratio (VSWR) bandwidth of the antenna. Input impedance of annular ring microstrip antenna using circuit theory approach A Bhattacharyya R Garg Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 33, No. 4. (1985), pp. 369-374. 2008-01-02T12:19:07-00:00 1985 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 33 4 369 374 annular antenna circuit impedance microstrip patch ring http://www.citeulike.org/user/dcastro/article/1992074 <i>Microwave and Wireless Components Letters, IEEE, Vol. 14, No. 1. (2004), pp. 31-33.</i><br /><br />A novel backward directional coupler, composed of a conventional microstrip (C/spl mu/S) line and composite right/left-handed (CRLH) line, is proposed. This coupler is functionally backward but it is based on a forward-type coupling phenomenon. The coupler is shown to exhibit broad bandwidth and tight coupling characteristics. The theoretical circuit-model results are supported by full-wave and experimental evidence. A quasi 0-dB prototype with more than 50% bandwidth is demonstrated. A novel mixed conventional microstrip and composite right/left-handed backward-wave directional coupler with broadband and tight coupling characteristics C Caloz T Itoh Microwave and Wireless Components Letters, IEEE, Vol. 14, No. 1. (2004), pp. 31-33. 2007-11-27T10:19:02-00:00 2004 Microwave and Wireless Components Letters, IEEE 14 1 31 33 broadband coupler crlh directional microstrip http://www.citeulike.org/user/dcastro/article/2774521 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 5. (1999), pp. 629-635.</i><br /><br />This paper presents the theory of a microstrip line on artificial periodic substrates. A two-stage moment method in conjunction with an array-scanning scheme is proposed for the microstrip characterization. The analytic and numerical methods dealing with the interaction of microstrip components (continuous plane-wave spectrum) with artificial periodic materials (discrete plane-wave spectrum, Floquet modes) are discussed. The method of solution involves two stages of vector integral equations and moment methods. The first integral-equation formulation is to find the Green's function for a planar periodic structure. A spectral-domain moment method is applied to the second vector integral equation to determine the fields or currents on the circuit components and the associated parameters of interest. Guided-wave characteristics of a microstrip line on artificial periodic substrates, including the propagation constant and the characteristic impedance, are investigated. Propagation bandgap of a microstrip line due to periodic elements is characterized. Experiment on a three-layer microstrip-line structure with a periodic mid-layer is conducted to validate the theory Theory of microstrip lines on artificial periodic substrates Hung-Yu Yang doi:10.1109/22.763165 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 5. (1999), pp. 629-635. 2008-05-09T06:44:35-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 5 629 635 line microstrip tl