CiteULike: dcastro's microstrip http://www.citeulike.org/user/dcastro/tag/microstrip CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2801463 <i>Electronics Letters, Vol. 34, No. 23. (1998), pp. 2194-2196.</i><br /><br />A compact and uniplanar antenna with broadband characteristics is presented. The novel Yagi-like printed dipole array antenna is fed by a microstrip-to-coplanar strip transition, and uses the truncated microstrip ground plane as its reflecting element. An X-band prototype measures a bandwidth of 17%. With 6.5 dB gain, 18 dB front-to-back ratio, and lower than -15 dB cross-polarisation level at 10 GHz Microstrip-fed quasi-Yagi antenna with broadband characteristics Y Qian WR Deal N Kaneda T Itoh Electronics Letters, Vol. 34, No. 23. (1998), pp. 2194-2196. 2008-05-15T12:14:41-00:00 Electronics Letters 34 23 2194 2196 antenna broadband microstrip http://www.citeulike.org/user/dcastro/article/2801461 <i>Antennas and Propagation, IEEE Transactions on, Vol. 51, No. 4. (2003), pp. 756-765.</i><br /><br />We present the analysis and design of a microstrip antenna array with a conical beam. The antenna array employs a periodic structure derived from a microstrip on a perforated ground plane. The microstrip antenna array consists of eight leaky lines evenly distributed around a circle. Each line radiates mainly a pair of forward and backward beams, forming a conical beam. The new leaky line design employs the concept of space-harmonic modulation on the EH/sub 0/ mode launched at the common joint of the antenna array. The scattering and dispersion characteristics of the leaky line are thoroughly investigated. It is theoretically and experimentally validated that the perturbation of the photolithographically etched antisymmetric holes excites the leaky EH/sub 1/ mode. Scattering analyses of the surface currents on the microstrip reveal in detail the physical operation of the leaky line. The dispersion characteristics are, thus, established and shown in a Brillouin diagram, indicating the role of each space harmonic, denoted by its complex propagation constant, /spl gamma//sub m,n//sup /spl plusmn//. Constant /spl gamma//sub m,n//sup /spl plusmn// represents a traveling-wave component of the nth higher-order spatial component in association with the EH/sub m/ mode: the superscript, + (-), signifies a forward (backward) traveling wave. For the particular leaky line design, /spl gamma//sub 0,-1//sup +/ and /spl gamma//sub 1,0//sup +/ space harmonics, both showing odd-symmetric field polarization, and both outside the triangular Brillouin region, form the backward and forward leaky waves, respectively. When the leaky lines are evenly and collinearly tied, an 11.5 GHz radial antenna array prototype is formed, and emits a conical beam, showing a 3 dB beamwidth of 24/spl deg/ at the flare angle of 31/spl deg/. A periodic microstrip radial antenna array with a conical beam Kuo-Cheng Chen Yongxi Qian CKC Tzuang T Itoh doi:10.1109/TAP.2003.811064 Antennas and Propagation, IEEE Transactions on, Vol. 51, No. 4. (2003), pp. 756-765. 2008-05-15T12:14:36-00:00 Antennas and Propagation, IEEE Transactions on 51 4 756 765 antenna array microstrip periodic http://www.citeulike.org/user/dcastro/article/2801444 <i>Microwave Symposium Digest, 1997., IEEE MTT-S International, Vol. 2 (1997), pp. 687-690 vol.2.</i><br /><br />A high efficiency class F power amplifier integrated with a circular sector microstrip antenna is reported. To obtain the class F operation, the second and third harmonics are shaped through the input impedance of the antenna. At the operating frequency of 2.55 GHz, a power added efficiency of 63% is demonstrated Class F power amplifier integrated with circular sector microstrip antenna V Radisic Yongxi Qian T Itoh doi:10.1109/MWSYM.1997.602884 Microwave Symposium Digest, 1997., IEEE MTT-S International, Vol. 2 (1997), pp. 687-690 vol.2. 2008-05-15T12:09:43-00:00 Microwave Symposium Digest, 1997., IEEE MTT-S International 2 687 690 vol.2 amplifier antenna circular integrated microstrip power 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 Microwave and Wireless Components Letters, IEEE 12 1 18 19 antenna circular compact microstrip patch polarisation 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 Microwave Theory and Techniques, IEEE Transactions on 47 12 2562 2567 antenna broadband 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 Antennas and Propagation Magazine, IEEE 36 1 16 19 efficiency fet high microstrip oscillator patch 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 Electronics Letters 30 22 1861 1862 microstrip resonator http://www.citeulike.org/user/dcastro/article/2782047 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1515-1521.</i><br /><br />The novel one-dimensional left-handed microstrip lines (LHMLs) consisting of the arrays of thin wires and two-layer split-ring resonators are investigated theoretically and experimentally in this paper. Unlike the conventional left-handed metamaterials for waveguides or microstrip lines, which are bulky three-dimensional constructions or require the lumped elements for high-pass configuration, this distributed structure can be directly implemented on a substrate by photolithographic techniques without soldering any chip inductors or capacitors. Moreover, it can also be easily realized at a higher frequency region by scaling the dimensions of the structure, making it highly efficient and flexible in millimeter-wave applications. To characterize the inhomogeneous LHML, the effective medium description is developed for extracting the effective electromagnetic parameters, i.e., the complex effective permittivity and permeability, as well as the refractive index. Results show that not only the simultaneously negative real permittivity and permeability, but also the antiparallel phase and group velocities may be achieved in the design passband region. In contrast to the antenna array using the conventional microstrip delay line, the LHML is incorporated in the series-fed microstrip combline array to exhibit the leading phase between the successive elements. Effective electromagnetic parameters of novel distributed left-handed microstrip lines Shau-Gang Mao Shiou-Li Chen Chen-Wei Huang doi:10.1109/TMTT.2005.845192 Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1515-1521. 2008-05-09T23:56:00-00:00 Microwave Theory and Techniques, IEEE Transactions on 53 4 1515 1521 lh line microstrip http://www.citeulike.org/user/dcastro/article/2782036 <i>Electronics Letters, Vol. 30, No. 21. (1994), pp. 1772-1774.</i><br /><br />Unwanted even order modes in tunable microstrip ring resonators can be suppressed by providing a low resistance path to ground at an appropriate point on the ring. This suppression method is simple to implement, and has minimal effect on the Q factor and the resonance frequency of the wanted modes Suppression of even modes in microstrip ring resonators DK Paul P Gardner KP Tan Electronics Letters, Vol. 30, No. 21. (1994), pp. 1772-1774. 2008-05-09T23:51:31-00:00 Electronics Letters 30 21 1772 1774 microstrip resonator http://www.citeulike.org/user/dcastro/article/2782032 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1331-1337.</i><br /><br />This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjusting its structure parameters. Emphasis is placed on filter synthesis for simultaneously matching in-band response and singly loaded Q by using tapped input/output couplings for the two designated passbands. Fractional bandwidth design graphs are used to determine proper geometric parameters of each coupled stage when filter specification is given. Realizable fractional bandwidths of the two passbands for a coupled SIR structure are clearly depicted in fractional bandwidth design graphs. Several experimental filters are fabricated and measured to demonstrate the design. Design of microstrip bandpass filters with a dual-passband response Jen-Tsai Kuo Tsung-Hsun Yeh Chun-Cheng Yeh doi:10.1109/TMTT.2005.845765 Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1331-1337. 2008-05-09T23:51:22-00:00 Microwave Theory and Techniques, IEEE Transactions on 53 4 1331 1337 bandpass filter microstrip http://www.citeulike.org/user/dcastro/article/2782029 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 51, No. 4. (2003), pp. 1241-1246.</i><br /><br />This paper presents a new compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filter. A bandstop filter is introduced that uses a ring resonator with direct-connected orthogonal feed lines. A new bandpass filter based on the bandstop filter uses two tuning stubs to construct a wide-band passband with two sharp stopbands. Without coupling gaps between feed lines and rings, there are no mismatch and radiation losses between them and, therefore, the new filters show low insertion loss. In addition, a dual-mode characteristic is used to increase the stopband bandwidth of the new filters. A simple transmission-line model used to calculate the frequency responses of the filters shows good agreement with measurements. The filter using three cascaded rings has 3-dB fractional bandwidth of 49.3%, an insertion loss of better than 1.6 dB in the passband, a return loss of larger than 13 dB from 4.58 to 7.3 GHz, and two rejections of greater than 40 dB within 2.75-4.02 and 7.73-9.08 GHz. The high-performance, compact-size, and low-cost filter was designed for reducing the interference in full duplex systems in satellite communications. Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters Lung-Hwa Hsieh Kai Chang doi:10.1109/TMTT.2003.809643 Microwave Theory and Techniques, IEEE Transactions on, Vol. 51, No. 4. (2003), pp. 1241-1246. 2008-05-09T23:50:43-00:00 Microwave Theory and Techniques, IEEE Transactions on 51 4 1241 1246 bandpass compact filter loss low microstrip http://www.citeulike.org/user/dcastro/article/2782025 <i>Electronics Letters, Vol. 37, No. 20. (2001), pp. 1213-1214.</i><br /><br />A dual-polarised microstrip antenna capable of achieving a wide bandwidth, a high isolation, low cross-polarisation levels and low backward radiation levels is presented. The H-shaped coupling aperture is used. For wide bandwidth and easy integration with active circuits, it uses the aperture-coupled stacked microstrip square patches. Measured return loss exhibits a bandwidth of over 20.9%, and isolation is better than 36 dB over the bandwidth. Cross-polarisation levels and the front-to-back ratio are better than 22 and 21 dB, respectively Wideband dual-polarised microstrip patch antenna SC Gao LW Li P Gardner PS Hall doi:10.1049/el:20010828 Electronics Letters, Vol. 37, No. 20. (2001), pp. 1213-1214. 2008-05-09T23:50:34-00:00 Electronics Letters 37 20 1213 1214 antenna dual microstrip patch polarisation wideband http://www.citeulike.org/user/dcastro/article/2782022 <i>Electronics Letters, Vol. 37, No. 18. (2001), pp. 1106-1107.</i><br /><br />A dual-polarised aperture-coupled microstrip antenna with a wide bandwidth, a high isolation, low cross-polarisation levels and low backward radiation levels is presented. The square patch is fed at two corners via H-shaped apertures. The measured return loss exhibits a bandwidth of over 24.4% and the isolation is better than 30 dB over the bandwidth. The cross-polarisation levels and the front-to-back ratio are better than -23 and 22 dB, respectively Dual-polarised wideband microstrip antenna SC Gao LW Li P Gardner PS Hall doi:10.1049/el:20010760 Electronics Letters, Vol. 37, No. 18. (2001), pp. 1106-1107. 2008-05-09T23:49:22-00:00 Electronics Letters 37 18 1106 1107 anten dual microstrip polarisation wideband http://www.citeulike.org/user/dcastro/article/2782007 <i>Phased Arrays, IEE Colloquium on (1991), pp. 9/1-9/4.</i><br /><br />The integration of circuit and antennas functions to form active radiating elements is an important area of interest for future phased arrays. Radiation from active circuits is analysed using equivalent source method and results presented for isolated transistors and transistor amplifiers. An active patch element with application to phased arrays is then described Microstrip active antennas PS Hall PM Haskins JS Dahele Phased Arrays, IEE Colloquium on (1991), pp. 9/1-9/4. 2008-05-09T23:43:12-00:00 Phased Arrays, IEE Colloquium on 9/1 9/4 active antenna microstrip http://www.citeulike.org/user/dcastro/article/2782006 <i>Microwave Symposium Digest, 1988., IEEE MTT-S International (1988), pp. 963-966 vol.2.</i><br /><br />A description is presented of active antennas and arrays fabricated using microstrip patch antennas and Gunn diodes. Injection-locking experiments were carried out on these <e1>X</e1>-band antennas to achieve frequency coherency and to calculate the circuit <e1>Q</e1>-factor. An electronic tuning range of over 9% has been achieved for the single active patch element. A two-element active array was also developed. The output power levels from the two elements were combined in free space, resulting in higher power in the main beam. The tuning range was much narrower and the antenna pattern broke from a single beam into two separate beams as the DC bias voltage was varied. The breakup limits the practical tuning range Microstrip active antennas and arrays KA Hummer K Chang doi:10.1109/MWSYM.1988.22191 Microwave Symposium Digest, 1988., IEEE MTT-S International (1988), pp. 963-966 vol.2. 2008-05-09T23:43:10-00:00 Microwave Symposium Digest, 1988., IEEE MTT-S International 963 966 vol.2 active antenna array microstrip 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 Microwave Symposium Digest, 2004 IEEE MTT-S International 3 1311 1314 Vol.3 filter microstrip http://www.citeulike.org/user/dcastro/article/2776177 <i>Antennas and Propagation Society International Symposium, 1999. IEEE, Vol. 3 (1999), pp. 1700-1703 vol.3.</i><br /><br />A full-wave fast wave concept iterative technique is developed to analyze single and stacked microstrip active antennas with arbitrary shape. The wave concept is developed to express the boundary conditions on the radiating surfaces in term of the waves, which are solved using the iterative technique. With the help of the modal FFT-algorithm an efficient code is developed which allows a rapid and accurate characterization of arbitrary shaped antennas embedded in single and multilayered dielectric without the trial functions usually used in the conventional integral method. The time saving factor is about 20 compared to the conventional numerical integral methods. Field distribution and input admittance are derived A new approach for microstrip active antennas using modal F.F.T-algorithm RS N'gongo H Baudrand doi:10.1109/APS.1999.788281 Antennas and Propagation Society International Symposium, 1999. IEEE, Vol. 3 (1999), pp. 1700-1703 vol.3. 2008-05-09T15:42:30-00:00 Antennas and Propagation Society International Symposium, 1999. IEEE 3 1700 1703 vol.3 active algorithm antenna fft microstrip http://www.citeulike.org/user/dcastro/article/2776106 <i>Electronics Letters, Vol. 33, No. 6. (1997), pp. 505-506.</i><br /><br />A new compact frequency doubling active transponder using a push-push technique is presented. Two outputs in anti-phase from the receiving patch antenna are amplified nonlinearly using MMICs and combined in phase suppressing the fundamental and enhancing the second harmonic. The doubled signal is then transmitted from a second patch antenna with a measured conversion gain of 6 dB Integrated push-push frequency doubling active microstrip transponder D Singh P Gardner PS Hall Electronics Letters, Vol. 33, No. 6. (1997), pp. 505-506. 2008-05-09T15:16:23-00:00 Electronics Letters 33 6 505 506 active antenna microstrip http://www.citeulike.org/user/dcastro/article/2776105 <i>Microwave Conference and Exhibition, 1997 27th European, Vol. 2 (1997), pp. 1181-1185.</i> Frequency Doubling Integrated Push-push Active Microstrip Transponder D Singh P Gardner PS Hall Microwave Conference and Exhibition, 1997 27th European, Vol. 2 (1997), pp. 1181-1185. 2008-05-09T15:16:22-00:00 Microwave Conference and Exhibition, 1997 27th European 2 1181 1185 active antenna microstrip http://www.citeulike.org/user/dcastro/article/2774808 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 35, No. 12. (1987), pp. 1343-1350.</i><br /><br />A rigorous solution to the problem of a rectangular microstrip antenna fed by a microstripline is presented. The currents on the feed line and the patch are expanded in a suitable set of modes, and a moment method solution is formulated in the spectral domain. Three special feed cases are treated: a patch fed at a radiating edge; a patch fed at a nonradiating edge; and a proximity coupled patch. Good results are obtained for the radiating edge fed case and the proximity coupled case. The nonradiating edge fed case results were not as good; reasons for this discrepancy are discussed. Calculations are compared with measurements for high and low dielectric constant substrates. A rigorous analysis of a microstripline fed patch antenna D Pozar S Voda Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 35, No. 12. (1987), pp. 1343-1350. 2008-05-09T08:50:15-00:00 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 35 12 1343 1350 antenna impedance microstrip patch http://www.citeulike.org/user/dcastro/article/2774807 <i>Antennas and Propagation, IEEE Transactions on, Vol. 38, No. 6. (1990), pp. 942-946.</i><br /><br />Effects of the feed probe an the size of the ground plane on the resonant frequency as well as the input impedance of a microstrip patch antenna are investigated. Measured data are provided for the first few modes. A method for cancellation of the unwanted modes is proposed and examined Impedance characteristics of circular microstrip patches K Antoskiewicz L Shafai doi:10.1109/8.55597 Antennas and Propagation, IEEE Transactions on, Vol. 38, No. 6. (1990), pp. 942-946. 2008-05-09T08:49:57-00:00 Antennas and Propagation, IEEE Transactions on 38 6 942 946 circular impedance microstrip patch http://www.citeulike.org/user/dcastro/article/2774805 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 32, No. 10. (1984), pp. 1101-1107.</i><br /><br />A solution is presented for the problem of an infinite array of microstrip patches fed with short current elements. The input reflection coefficient is calculated versus scan angle in an arbitrary scan plane, and the effects of substrate parameters and grid spacings are considered. The scan blindness phenomenom is observed and discussed in terms of a forced surface wave response. Measurements from waveguide simulators confirm the theory for thin substrates. Analysis of an infinite array of rectangular microstrip patches with idealized probe feeds D Pozar D Schaubert Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 32, No. 10. (1984), pp. 1101-1107. 2008-05-09T08:48:44-00:00 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 32 10 1101 1107 analysis array microstrip patch http://www.citeulike.org/user/dcastro/article/2774792 <i>Antennas and Propagation, IEEE Transactions on, Vol. 49, No. 1. (2001), pp. 45-47.</i><br /><br />The impedance of a rectangular patch antenna fed by an inset microstrip transmission line was measured for various feed positions. The dependence found was then compared to theoretical predictions both for this geometry and for the similar case of an inset coaxial probe feed The dependence of the input impedance on feed position of probe and microstrip line-fed patch antennas LI Basilio MA Khayat JT Williams SA Long doi:10.1109/8.910528 Antennas and Propagation, IEEE Transactions on, Vol. 49, No. 1. (2001), pp. 45-47. 2008-05-09T08:44:04-00:00 Antennas and Propagation, IEEE Transactions on 49 1 45 47 antenna impedance input microstrip patch http://www.citeulike.org/user/dcastro/article/2774793 <i>Antennas and Propagation, IEEE Transactions on, Vol. 37, No. 11. (1989), pp. 1361-1369.</i><br /><br />The study of microstrip patch antennas is directly treated in the time domain, using a modified finite-difference time-domain (FDTD) method. Assuming an appropriate choice of excitation, the frequency dependence of the relevant parameters can readily be found using the Fourier transform of the transient current. The FDTD method allows a rigorous treatment of one or several dielectric interfaces. Different types of excitation can be taken into consideration (coaxial, microstrip lines, etc.). Plotting the spatial distribution of the current density gives information about the resonance modes. The usual frequency-dependent parameters (input impedance, radiation pattern) are given for several examples Analysis of microstrip patch antennas using finite difference time domain method A Reineix B Jecko doi:10.1109/8.43555 Antennas and Propagation, IEEE Transactions on, Vol. 37, No. 11. (1989), pp. 1361-1369. 2008-05-09T08:44:21-00:00 Antennas and Propagation, IEEE Transactions on 37 11 1361 1369 antenna fdtd microstrip patch http://www.citeulike.org/user/dcastro/article/2774784 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 30, No. 4. (1982), pp. 645-650.</i><br /><br />Using Richmond's reaction integral equation, an expression is derived for the input impedance of microstrip patch antennas excited by either a microstrip line or a coaxial probe. The effects of the finite substrate thickness, a dielectric protective cover, and associated surface waves are properly included by the use of the exact dyadic Green's function. Using the present formulation the input impedance of a rectangular microstrip antenna is determined and compared with experimental and earlier calculated results. Input impedance of microstrip antennas M Deshpande M Bailey Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 30, No. 4. (1982), pp. 645-650. 2008-05-09T08:41:23-00:00 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 30 4 645 650 antennas impedance input microstrip http://www.citeulike.org/user/dcastro/article/2774782 <i>Electronics Letters, Vol. 31, No. 8. (1995), pp. 604-605.</i><br /><br />A novel small microstrip patch antenna is presented. The probe-fed circular microstrip patch incorporates a single shorting post which significantly reduces the overall size of the antenna. Experimental and theoretical impedance behaviour and radiation characteristics of the modified patch are given. Very good agreement between experiment and theory was achieved Small microstrip patch antenna R Waterhouse Electronics Letters, Vol. 31, No. 8. (1995), pp. 604-605. 2008-05-09T08:41:03-00:00 Electronics Letters 31 8 604 605 antenna microstrip patch small http://www.citeulike.org/user/dcastro/article/2774765 <i>Microwave Symposium Digest, 1995., IEEE MTT-S International (1995), pp. 1099-1102 vol.3.</i><br /><br />This paper presents an 18 GHz circularly polarised multilayer active antenna subarray using MMIC amplifiers. With the advantage of a multilayer structure, the radiation patterns from the antenna side are not affected by the radiation from the circuit side. An extra gain of 15.46 dB has been measured in comparison to the passive array. This type of array can be the ideal building block for large microstrip phased array systems An 18 GHz circularly polarised multilayer active microstrip antenna subarray using MMIC amplifiers D Sanchez-Hernandez M Gillick I Robertson doi:10.1109/MWSYM.1995.406163 Microwave Symposium Digest, 1995., IEEE MTT-S International (1995), pp. 1099-1102 vol.3. 2008-05-09T08:35:42-00:00 Microwave Symposium Digest, 1995., IEEE MTT-S International 1099 1102 vol.3 active amplifier antenna circular microstrip multilayer polarisation http://www.citeulike.org/user/dcastro/article/2774722 <i>Antennas and Propagation, Tenth International Conference on (Conf. Publ. No. 436), Vol. 1 (1997), pp. 423-426 vol.1.</i><br /><br />The emergence of wireless communication systems and radar applications requires compact antenna structures that are easy to manufacture. Microstrip antennas are suitable for these applications because they have many advantages: high performance, thin profile, and low cost. However, applications of microstrip antennas are limited mainly because of their narrow bandwidth. Furthermore, the conventional array antennas associated with the feeder network require a large size and suffer from unwanted mutual coupling between the feeder network and the resonators which reduces the efficiency of the array antenna. We propose a design of linear and 2D array antennas which leads to a size reduction and high performance. A description of the analysis method is exposed and an emphasis on the experimental results of these antennas operating in the X-band are presented to validate this design. Moreover, the techniques employed for this design are well-adapted for the monolithic concept of millimetre waves band active antennas Study and design of compact wideband microstrip antennas F Carrez J Vindevoghel Antennas and Propagation, Tenth International Conference on (Conf. Publ. No. 436), Vol. 1 (1997), pp. 423-426 vol.1. 2008-05-09T08:23:42-00:00 Antennas and Propagation, Tenth International Conference on (Conf. Publ. No. 436) 1 423 426 vol.1 active antenna compact microstrip wideband http://www.citeulike.org/user/dcastro/article/2774626 <i>Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 147, No. 6. (2000), pp. 479-482.</i><br /><br />An active microstrip antenna with self-mixing oscillator is introduced with double-ring geometry. It is simple to implement and presents a dual-frequency response in the operating range of C-band (3.7-4.2 GHz). The circuit with common-drain FET is used as an oscillator as well as a mixer. This active microstrip antenna can be applied in ROTV of satellite communication as the down converter Double-ring active microstrip antenna and self-mixing oscillator in C-band JC Liu PC Lu DC Chang CC Chang doi:10.1049/ip-map:20000794 Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 147, No. 6. (2000), pp. 479-482. 2008-05-09T07:33:51-00:00 Microwaves, Antennas and Propagation, IEE Proceedings - 147 6 479 482 active antenna c-band microstrip mixer oscillator http://www.citeulike.org/user/dcastro/article/2774608 <i>Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 151, No. 5. (2004), pp. 430-434.</i><br /><br />A novel design of a dual-mode resonator with a double-ring structure for band-pass filter applications is presented in this paper. Conventionally, dual-mode ring resonators are used to obtain band-pass filters. Based on voltage/current couplings, a dual-mode double-ring resonator was recently constructed to improve the responses of the conventional dual-mode ring resonator. In order to obtain a low insertion loss, a wide band and higher rejection, three filters using a dual-mode double-ring resonator are designed for 2.4 GHz ISM band applications. Dual-mode double-ring resonators for microstrip band-pass-filter applications JC Liu PC Lu CH Shie CS Cheng L Yao doi:10.1049/ip-map:20040725 Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 151, No. 5. (2004), pp. 430-434. 2008-05-09T07:26:03-00:00 Microwaves, Antennas and Propagation, IEE Proceedings - 151 5 430 434 bandpass dual filter microstrip mode resonator ring 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 Microwaves, Antennas & Propagation, IET 2 1 1 5 antenna circular frequency microstrip ring shorted 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 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/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 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/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 Microwave Theory and Techniques, IEEE Transactions on 48 10 1765 1768 active antenna microstrip receiver 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 Microwave Theory and Techniques, IEEE Transactions on 47 5 629 635 line microstrip tl http://www.citeulike.org/user/dcastro/article/2774512 <i>Antennas and Propagation, IEEE Transactions on, Vol. 45, No. 8. (1997), pp. 1310-1314.</i><br /><br />Micromachining techniques using closely spaced holes have been used underneath a microstrip antenna on a high dielectric-constant substrate (&epsiv;_r=10.8) to synthesize a localized low dielectric-constant environment (&epsiv;_r=2.3). The measured radiation efficiency of a microstrip antenna on a micromachined 635-μm thick &epsiv;_r=10.8 Duroid 6010 substrate increased from 48±3% to 73±3% at 12.8-13.0 GHz (including 3.3-cm feed line losses). We believe that this technique can be applied to millimeter-wave antennas (microstrip, dipoles, slots, etc.) on silicon and GaAs substrates to result in relatively wideband (3-6%) monolithic microwave integrated circuits (MMIC) active antenna modules for phased-arrays and collision-avoidance systems Microstrip antennas on synthesized low dielectric-constant substrates GP Gauthier A Courtay GM Rebeiz doi:10.1109/8.611252 Antennas and Propagation, IEEE Transactions on, Vol. 45, No. 8. (1997), pp. 1310-1314. 2008-05-09T06:42:47-00:00 Antennas and Propagation, IEEE Transactions on 45 8 1310 1314 active antenna microstrip http://www.citeulike.org/user/dcastro/article/2774502 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 1. (2002), pp. 201-206.</i><br /><br />Active patch antennas are simple to fabricate, compact, and low cost, but have inherently poor phase noise and stability. In this paper, a phase-locked loop (PLL) integrated with a 4-GHz active patch antenna was investigated in order to reduce the phase noise and stabilize the frequency of the oscillator. Both these aims were realized by careful integration and optimization of the PLL parameters. Experimental results showed that a phase noise reduction in excess of 55 dB was achieved using this technique. A standalone voltage-controlled oscillator and passive patch technique can provide lower phase noise, but the active patch lends itself to effective integration. Measurement techniques were demonstrated to measure the phase noise and stability of the patch oscillator Phase-locked-loop control of active microstrip patch antennas JW Andrews PS Hall doi:10.1109/22.981266 Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 1. (2002), pp. 201-206. 2008-05-09T06:40:39-00:00 Microwave Theory and Techniques, IEEE Transactions on 50 1 201 206 active antenna microstrip patch pll http://www.citeulike.org/user/dcastro/article/2065972 <i></i><br /><br />A novel circularly polarized (CP), single-fed microstrip antenna is presented. The antenna consists of stacked structure of a rectangular ring patch over another rectangular ring. The proposed design has a reduced antenna size as compared to the conventional CP microstrip antenna at a given operating frequency. The impedance and axial ratio bandwidths are large and CP radiation quality is excellent over the entire upper hemisphere. These antennas feature more than 9dBi gain. The... A Dual Band Circularly Polarised Microstrip Antenna with a Single Feed T Sudha TS Vedavathy 2007-12-06T09:21:19-00:00 antenna circularly dual-band microstrip polarisation http://www.citeulike.org/user/dcastro/article/2774494 <i>Electronics Letters, Vol. 34, No. 12. (1998), pp. 1170-1171.</i><br /><br />A novel technique for obtaining dual-band circular polarisation (CP) radiation of a single-feed circular microstrip antenna is proposed and demonstrated. By embedding two pairs of arc-shaped slots of proper lengths close to the boundary of a circular patch, and protruding one of the arc-shaped slots with a narrow slot, the circular microstrip antenna can perform dual-band CP radiation using a single probe feed. Details of the antenna design and experimental results are presented Single-feed dual-band circularly polarised microstrip antenna Gui-Bin Hsieh Ming-Huang Chen Kin-Lu Wong Electronics Letters, Vol. 34, No. 12. (1998), pp. 1170-1171. 2008-05-09T06:38:11-00:00 Electronics Letters 34 12 1170 1171 antenna circularly dual-band microstrip polarisation http://www.citeulike.org/user/dcastro/article/2768748 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 27, No. 6. (1979), pp. 850-853.</i><br /><br />The omni microstrip antenna is a microstrip-shorted quarter-wave resonator that is wrapped around a cylinder. It is an electrically short antenna, and it can be made to radiate an omnidirectional pattern normal to the axis of the cylinder. Equations governing the design of the antenna are given along with a method of excitation. An example of a design at 41.4 MHz is given, and experimental results are reported. The omni microstrip antenna: a new small antenna A Krall J Mccorkle J Scarzello A Syeles Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 27, No. 6. (1979), pp. 850-853. 2008-05-08T07:30:08-00:00 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 27 6 850 853 antenna microstrip small http://www.citeulike.org/user/dcastro/article/2768741 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 27, No. 2. (1979), pp. 137-145.</i><br /><br />A simple theory based on the cavity model is developed to analyze microstrip antennas. Formulas for numerous canonical shapes are given. In general the theoretically predicted radiation patterns and impedance loci closely agree with those measured for many antennas of various shapes and dimensions investigated thus far. In fact, this theory enables the computation of both patterns and impedance loci with little effort. The input admittance locus generally follows a circle of nearly constant conductance, but its center is shifted to the inductive region in the Smith chart plot. Peculiar properties for the case with degenerate or slightly degenerate eigenvalues are discussed. An accurate formula for determining the resonant frequency of a rectangular microstrip antenna is also given. Theory and experiment on microstrip antennas Y Lo D Solomon W Richards Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 27, No. 2. (1979), pp. 137-145. 2008-05-08T07:27:10-00:00 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 27 2 137 145 antenna microstrip http://www.citeulike.org/user/dcastro/article/2768681 <i>Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 3484-3487.</i> Multi-frequency microstrip patch antennas based on metamaterial structures Francisco Herraiz-Martfnez Vicente Gonzalez-Posadas Daniel Segovia-Vargas doi:10.1109/APS.2007.4396288 Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 3484-3487. 2008-05-08T06:48:59-00:00 Antennas and Propagation International Symposium, 2007 IEEE 3484 3487 antenna metamaterial microstrip multiband patch http://www.citeulike.org/user/dcastro/article/2768678 <i>Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6.</i><br /><br />Microstrip patches filled with Left-Handed Structures are proposed to obtain dual band circularly polarized antennas. The proposed antennas have two modes at different frequencies with similar characteristics to the fundamental mode of a conventional patch. These modes are excited in two orthogonal directions with a 90° phase shift to obtain dual band circularly polarized antennas. The most important feature of the proposed antennas is that the frequency ratio between the working frequencies can be set within a large range: from values smaller than 1.2 to values larger than 2.2. Finally, a dual band circularly polarized antenna for GSM 1800 and WCDMA is designed, manufactured and measured. The working ratio is only 1.17, which cannot be obtained with other approaches. A Dual Band Circularly Polarized Antenna based on a Microstrip Patch Filled with Left-Handed Structures FJ Herraiz-Martinez V Gonzalez-Posadas D Segovia-Vargas Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-6. 2008-05-08T06:48:06-00:00 Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on 1 6 antenna circularly crlh dual-band microstrip patch polarisation http://www.citeulike.org/user/dcastro/article/2768677 <i>Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 149, No. 2. (2002), pp. 113-118.</i><br /><br />The presence of mutual coupling severely degrades the performance of an adaptive array. A simple method based on obtaining an N×N coupling matrix, <e2>C</e2>, to compensate for the coupling effects in direction-of-arrival (DOA) estimation algorithms is presented. It is based on the theory of characteristic modes in conjunction with an element-by-element analysis of finite arrays. As a small number of characteristic modes are needed to yield a good approximation of induced currents, the method significantly reduces the computational effort in calculating the unknowns. Its application to the MUSIC algorithm results in good and efficient performance Mutual coupling effects correction in microstrip arrays for direction-of-arrival (DOA) estimation D Segovia-Vargas R Martin-Cuerdo M Sierra-Perez doi:10.1049/ip-map:20020232 Microwaves, Antennas and Propagation, IEE Proceedings -, Vol. 149, No. 2. (2002), pp. 113-118. 2008-05-08T06:47:57-00:00 Microwaves, Antennas and Propagation, IEE Proceedings - 149 2 113 118 array coupling doa estimation microstrip http://www.citeulike.org/user/dcastro/article/2768665 <i>Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-8.</i><br /><br />This work presents and compares three evolutionary algorithms (EAs), each one from three of the main trends in literature: Genetic Algorithm (GA), Evolutionary Programming (EP), and Evolutionary Strategies (ES). They are validated and applied to optimize microstrip antennas (MSA) design in single and multiobjective approaches. The effect of random numbers with different distributions (Uniform, Gaussian, Cauchy and Hybrid Gaussian-Cauchy) used by genetic operators is analysed. A CAD Model based on Cavity Method is used to assess MSAs. Standing wave ratio (SWR), bandwidth (BW), and radiation efficiency (er) are optimized parameters. Average maximum values for fitness are obtained and compared fore each case. Through the multiobjective approach, each EA generates the Pareto Frontier for the problem. Finally, the ability of each algorithm to find dominants individuals is compared, what allows the assessment or their efficiency. Evolutionary Algorithms Applied to Microstrip Antennas Design Juliano Brianeze da Silva Hugo Hernandez-Figueroa Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-8. 2008-05-08T06:41:00-00:00 Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on 1 8 algorithm antenna design evolution microstrip http://www.citeulike.org/user/dcastro/article/2768662 <i>Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 2. (2005), pp. 101-103.</i><br /><br />Since conventional microstrip hairpin filter and diplexer are inherently formed by coupled-line resonators, spurious response and poor isolation performance are unavoidable. This letter presents a simple technique that is suitable for an inhomogeneous structure such as microstrip to cure such poor performances. The technique is based on the stepped impedance coupled-line resonator and is verified by the experimental results of the designed 0.9GHz/1.8GHz microstrip hairpin diplexer. High isolation and compact size microstrip hairpin diplexer S Srisathit S Patisang R Phromloungsri S Bunnjaweht S Kosulvit M Chongcheawchamnan doi:10.1109/LMWC.2004.842839 Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 2. (2005), pp. 101-103. 2008-05-08T06:40:31-00:00 Microwave and Wireless Components Letters, IEEE 15 2 101 103 compact diplexer isolation microstrip http://www.citeulike.org/user/dcastro/article/2768661 <i>Microwaves, Radar and Wireless Communications, 2002. MIKON-2002. 14th International Conference on, Vol. 1 (2002), pp. 187-190 vol.1.</i><br /><br />This paper deals with the design and implementation of a very compact microstrip Tx/Rx diplexer for future UMTS mobile terminals. Miniaturised loop-resonator filters have been developed and combined into a diplexer structure, satisfying different constraints such as high electrical performance level (especially, a very narrow bandwidth, low insertion losses and a high out-of-band rejection), or great compactness and compatibility with a standard planar integration. Design and implementation of a compact microstrip Tx/Rx diplexer for UMTS equipments Y Toutain C Person JP Coupez doi:10.1109/MIKON.2002.1017831 Microwaves, Radar and Wireless Communications, 2002. MIKON-2002. 14th International Conference on, Vol. 1 (2002), pp. 187-190 vol.1. 2008-05-08T06:40:29-00:00 Microwaves, Radar and Wireless Communications, 2002. MIKON-2002. 14th International Conference on 1 187 190 vol.1 compact design diplexer microstrip umts http://www.citeulike.org/user/dcastro/article/2768658 <i>Microwave Conference, 2003. 33rd European, Vol. 3 (2003), pp. 919-922 Vol.3.</i><br /><br />A compact wide-band microstrip diplexer working in the 0.9/spl divide/2.5 GHz frequency range is presented. This component is a key part of the feeding network of a multifunctional antenna, working at five frequency bands associated to terrestrial and satellite radio services. By using interdigital capacitors in conjunction with the stepped impedance technique, very good results in terms of compactness and performances have been obtained. An unconventional arrangement of the filters has led to a further reduction of the dimensions. Planar microstrip diplexer for multifunctional antenna L Marcaccioli G Olbrich S Lindenmeier R Sorrentino doi:10.1109/EUMC.2003.1262801 Microwave Conference, 2003. 33rd European, Vol. 3 (2003), pp. 919-922 Vol.3. 2008-05-08T06:40:25-00:00 Microwave Conference, 2003. 33rd European 3 919 922 Vol.3 antenna diplexer microstrip planar 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 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/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 Microwave Theory and Techniques, IEEE Transactions on 52 5 1425 1432 front-end microstrip tl