Thu, 21 Aug 2008 15:04:57 BST CiteULike: Tag pbg http://www.citeulike.org/tag/pbg CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2762225 <i>Antennas and Propagation Society International Symposium, 2000. IEEE, Vol. 3 (2000), pp. 1796-1799 vol.3.</i><br /><br />A low-profile cavity-backed slot antenna is proposed using a uniplanar compact photonic band-gap (UC-PBG) structure, which is a 2D periodic metallic pattern loaded on a thin dielectric slab backed with a ground plane. The UC-PBG substrate behaves like an open boundary at the resonant frequency and this property is exploited to reduce the cavity size while keeping good antenna performance Low-profile cavity-backed slot antenna using UC-PBG substrate F Yang Y Qian T Itoh doi:10.1109/APS.2000.874593 Antennas and Propagation Society International Symposium, 2000. IEEE, Vol. 3 (2000), pp. 1796-1799 vol.3. 2008-05-06T18:30:55-00:00 2000 Antennas and Propagation Society International Symposium, 2000. IEEE 3 1796 1799 vol.3 antenna pbg http://www.citeulike.org/user/dcastro/article/2801477 <i>Antennas and Propagation Society International Symposium, 1998. IEEE, Vol. 2 (1998), pp. 656-659 vol.2.</i><br /><br />A periodically loaded substrate is employed to reduce excitation of surface waves by a patch antenna. The computed dispersion diagram of the substrates shows that surface wave propagation is forbidden along specific directions. By properly orienting the patch antenna on the substrate, this can result in good improvement of antenna performance. In agreement with the expected result, the measured radiation pattern shows a 10 dB reduction in the side lobes associated with power launched from surface waves Radiation characteristics of a patch antenna on a thin PBG substrate R Coccioli WR Deal T Itoh doi:10.1109/APS.1998.702023 Antennas and Propagation Society International Symposium, 1998. IEEE, Vol. 2 (1998), pp. 656-659 vol.2. 2008-05-15T12:19:03-00:00 1998 Antennas and Propagation Society International Symposium, 1998. IEEE 2 656 659 vol.2 antenna patch pbg http://www.citeulike.org/user/dcastro/article/2776179 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2123-2130.</i><br /><br />The recently developed uniplanar compact photonic bandgap (UC-PBG) substrate is successfully used to reduce surface-wave losses for an aperture-coupled fed patch antenna on a thick high dielectric-constant substrate. The surface-wave dispersion diagram of the UC-PBG substrate has been numerically computed for two different substrate thickness (25 and 50 mil) and found to have a complete stopband in the frequency range of 10.9-13.5 and 11.4-12.8 GHz, respectively. The thicker substrate is then used to enhance broadside gain of a patch antenna working in the stopband at 12 GHz. Computed results and measured data show that, due to effective surface-wave suppression, the antenna mounted on the UC-PBG substrate has over 3-dB higher gain in the broadside direction than the same antenna etched on a grounded dielectric slab with same thickness and dielectric constant. Cross-polarization level remains 13 dB down the co-polar component level for both E- and H-planes Aperture-coupled patch antenna on UC-PBG substrate R Coccioli Fei-Ran Yang Kuang-Ping Ma T Itoh doi:10.1109/22.798008 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2123-2130. 2008-05-09T15:42:39-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 11 2123 2130 antenna patch pbg http://www.citeulike.org/user/dcastro/article/2941960 <i>Comptes Rendus Physique, Vol. 6, No. 6. ( 2005), pp. 683-692.</i><br /><br />We review the electromagnetic properties of artificial structures such as photonic band gap materials (Electromagnetic Band Gap at microwaves) and metamaterials with main emphasis on backward (left-handed) propagation media. We consider free space and guiding structures by showing how the interaction of the electromagnetic wave with periodic dielectric (PBGs) and double negative metallic structures (DNGs) yields a negative refractive index. Some of the potential applications in connection with negative index media are briefly discussed such as focusing for a flat lens and phase advance for a left handed transmission line. To cite this article: T. Decoopman et al., C. R. Physique 6 (2005). Left-handed propagation media via photonic crystal and metamaterials Thibaut Decoopman Thomas Crepin Mathias Perrin Sophie Fasquel Aurélien Marteau Xavier Mélique Eric Lheurette Olivier Vanbésien Didier Lippens doi:10.1016/j.crhy.2005.06.007 Comptes Rendus Physique, Vol. 6, No. 6. ( 2005), pp. 683-692. 2008-06-29T18:30:15-00:00 2005 Comptes Rendus Physique 6 6 683 692 crlh lh metamaterial pbg http://www.citeulike.org/user/dcastro/article/2762223 <i>Antennas and Propagation Society International Symposium, 1999. IEEE, Vol. 3 (1999), pp. 1920-1923 vol.3.</i><br /><br />The previously developed uniplanar compact PBG (UC-PBG) substrate is successfully used to reduce surface wave losses of a patch antenna on a high-dielectric constant substrate. The surface wave dispersion diagram of the UC-PBG substrate has been numerically computed and found to have a complete bandgap in the range of frequency 10.9-13.5 GHz. This feature is exploited to enhance both bandwidth and broadside gain of a patch antenna working at the frequency 11.5 GHz in the forbidden bandgap. Measured results show a 2.8 dB higher radiation in the broadside direction than that of a standard patch antenna built on the same high-permittivity grounded dielectric slab PBG-assisted gain enhancement of patch antennas on high-dielectric constant substrate FR Yang R Coccioli Y Qian T Itoh doi:10.1109/APS.1999.788333 Antennas and Propagation Society International Symposium, 1999. IEEE, Vol. 3 (1999), pp. 1920-1923 vol.3. 2008-05-06T18:30:52-00:00 1999 Antennas and Propagation Society International Symposium, 1999. IEEE 3 1920 1923 vol.3 antenna patch pbg 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/2776270 <i>Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 8, No. 2. (1998), pp. 69-71.</i><br /><br />A new two-dimensional (2-D) photonic bandgap (PBG) structure for microstrip lines is proposed, in which a periodic 2-D pattern consisting of circles is etched in the ground plane of microstrip line. No drilling through the substrate is required. Three PBG circuits were fabricated with different circle radii to determine the optimum dimensions, as well as a PBG circuit with the compensated right-angle microstrip bend. Measurements show that deep and wide stopbands can be achieved using this method Novel 2-D photonic bandgap structure for microstrip lines V Radisic Y Qian R Coccioli T Itoh doi:10.1109/75.658644 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 8, No. 2. (1998), pp. 69-71. 2008-05-09T16:40:10-00:00 1998 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters] 8 2 69 71 microstrip pbg http://www.citeulike.org/user/dcastro/article/2776227 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2092-2098.</i><br /><br />A novel waveguide using a photonic bandgap (PBG) structure is presented. The PBG structure is a two-dimensional square lattice with each cell consisting of metal pads and four connecting lines, which are etched on a conductor-backed Duroid substrate. This uniplanar compact PBG structure realizes a magnetic surface in the stopband and is used in the waveguide walls to provide magnetic boundary conditions. A relatively uniform field distribution along the cross section has been measured at frequencies from 9.4 to 10.4 GHz. Phase velocities close to the speed of light have also been observed in the stopband, indicating that TEM mode has been established. A recently developed quasi-Yagi antenna has been employed as a broad-band and efficient waveguide transition. Meanwhile, full-wave simulations using the finite-difference time-domain method provide accurate predictions for the characteristics of both the perfect magnetic conductor impedance surface and the waveguide structure. This novel waveguide structure should find a wide range of applications in different areas, including quasi-optical power combining and the electromagnetic compatibility testing A novel TEM waveguide using uniplanar compact photonic-bandgap (UC-PBG) structure Fei-Ran Yang Kuang-Ping Ma Yongxi Qian T Itoh doi:10.1109/22.798004 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 11. (1999), pp. 2092-2098. 2008-05-09T16:10:18-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 11 2092 2098 pbg http://www.citeulike.org/user/dcastro/article/2776281 <i>Lightwave Technology, Journal of, Vol. 20, No. 11. (2002), pp. 1962-1967.</i><br /><br />A new photonic signal processor topology that simultaneously achieves both a high-Q and a high skirt selectivity and stopband attenuation filter response is presented. It is based on a novel dual-cavity bandpass optical structure in which two pairs of active fiber Bragg grating cavities are used with an optical gain offset to control the poles and stopband attenuation characteristics of the filter. This concept enables a large improvement in the filter stopband attenuation, rejection bandwidth, and skirt selectivity to be realized. Measured results demonstrate both a narrow bandpass bandwidth of 0.4% of center frequency and a skirt selectivity factor of 16.6 for 40 dB rejection, which corresponds to a 6.5-fold improvement in comparison to conventional single cavity high-Q structures. To our knowledge, this is the best skirt selectivity reported for a photonic bandpass filter to date. The new photonic filter structure has been experimentally verified and excellent agreement between measured and predicted responses is shown. Photonic bandpass filters with high skirt selectivity and stopband attenuation EHW Chan KE Alameh RA Minasian doi:10.1109/JLT.2002.804018 Lightwave Technology, Journal of, Vol. 20, No. 11. (2002), pp. 1962-1967. 2008-05-09T16:41:55-00:00 2002 Lightwave Technology, Journal of 20 11 1962 1967 filter pbg http://www.citeulike.org/user/dcastro/article/2941953 <i>Journal of Zhejiang University - Science A, Vol. 7, No. 1. (23 January 2006), pp. 34-40.</i><br /><br />Abstract  In this paper, numerical modelling of left-handed materials (LHMs) is presented using in-house and commercial software packages. Approaches used include the finite-difference time-domain (FDTD) method, finite element method (FEM) and method of moments (MoMs). Numerical simulation includes verification of negative refraction and “perfect lenses” construction, investigation of evanescent wave behaviour in layered LHMs, reversed Snell’s Law in electromagnetic band gap (EBG)-like structures and construction of LHMs using modified split ring resonators (SRRs). Numerical results were verified to be in good agreement with theory. At the end of this paper, potential applications of LHMs in microwave engineering are discussed. From electromagnetic bandgap to left-handed metamaterials: Modelling and applications Yang Hao doi:10.1631/jzus.2006.A0034 Journal of Zhejiang University - Science A, Vol. 7, No. 1. (23 January 2006), pp. 34-40. 2008-06-29T18:26:30-00:00 2006 Journal of Zhejiang University - Science A 7 1 34 40 crlh metamaterial pbg http://www.citeulike.org/user/dcastro/article/2762218 <i>Electronics Letters, Vol. 34, No. 21. (1998), pp. 2041-2042.</i><br /><br />The realisation of a magnetic conducting surface using a novel two-dimensional uniplanar photonic bandgap structure is described. This novel idea is verified by measured results and the results obtained using the finite-difference time-domain method Realisation of magnetic conducting surface using novel photonic bandgap structure KP Ma K Hirose FR Yang Y Qian T Itoh Electronics Letters, Vol. 34, No. 21. (1998), pp. 2041-2042. 2008-05-06T18:28:49-00:00 1998 Electronics Letters 34 21 2041 2042 pbg http://www.citeulike.org/user/dcastro/article/2768633 <i>Microwave and Wireless Components Letters, IEEE, Vol. 16, No. 2. (2006), pp. 93-95.</i><br /><br />A new compact defected ground structure (DGS) is proposed for the microstrip line. The structure is compact in microstrip line direction. Here, this DGS is used to design a compact low pass filter (LPF) that is at least 26.3% more compact lengthwise than other reported compact structures and has sharper transition knee. A novel defected ground structure for planar circuits MK Mandal S Sanyal doi:10.1109/LMWC.2005.863192 Microwave and Wireless Components Letters, IEEE, Vol. 16, No. 2. (2006), pp. 93-95. 2008-05-08T06:28:57-00:00 2006 Microwave and Wireless Components Letters, IEEE 16 2 93 95 circuit pbg planar http://www.citeulike.org/user/dcastro/article/2782070 <i>Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 3 (1999), pp. 919-922 vol.3.</i><br /><br />A novel lowpass filter with a uniplanar, compact photonic band-gap structure etched in the ground plane has been proposed and demonstrated. This new filter has a deep attenuation and spurious-free response. A drain mixer using this novel filter suppresses the LO leakage by over 10 dB compared to a reference mixer with a conventional filter A novel uniplanar compact PBG structure for filter and mixer applications Fei-Ran Yang Yongxi Qian T Itoh doi:10.1109/MWSYM.1999.779536 Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 3 (1999), pp. 919-922 vol.3. 2008-05-10T00:03:34-00:00 1999 Microwave Symposium Digest, 1999 IEEE MTT-S International 3 919 922 vol.3 compact mixer pbg structure http://www.citeulike.org/user/dcastro/article/2768631 <i>Antennas and Wireless Propagation Letters, IEEE, Vol. 1 (2002), pp. 135-137.</i><br /><br />Anisotropic characteristics of a uniplanar compact photonic bandgap (UC-PBG) structure are studied and applied for the first time into the design of microstrip diplexer patch antennas to enhance the isolation between transmitting (Tx) and receiving (Rx) ports. Theoretical results indicate that the isolation is improved and measurement results are compared with simulation data and good agreement is reported. Isolation enhancement of anisotropic UC-PBG microstrip diplexer patch antenna Y Hao CG Paini doi:10.1109/LAWP.2002.806757 Antennas and Wireless Propagation Letters, IEEE, Vol. 1 (2002), pp. 135-137. 2008-05-08T06:28:53-00:00 2002 Antennas and Wireless Propagation Letters, IEEE 1 135 137 antenna diplexer patch pbg http://www.citeulike.org/user/dcastro/article/2774600 <i>Infrared and Millimeter Waves, 2002. Conference Digest. Twenty Seventh International Conference on (2002), pp. 353-354.</i><br /><br />A microstrip active antenna designed using photonic crystals placed inside the oscillator structure to reject undesired harmonics is presented for first time. Experimental results show that an increase of power in the fundamental oscillator frequency can be also observed. Several advanced structures are presented for optimal rejection of the undesired harmonics. Active antenna with intrinsic harmonic rejection by using a photonic crystal A Gonzalez T Lopetegi MAG Laso F Falcone M Sorolla doi:10.1109/ICIMW.2002.1076230 Infrared and Millimeter Waves, 2002. Conference Digest. Twenty Seventh International Conference on (2002), pp. 353-354. 2008-05-09T07:24:26-00:00 2002 Infrared and Millimeter Waves, 2002. Conference Digest. Twenty Seventh International Conference on 353 354 active antenna pbg http://www.citeulike.org/user/dcastro/article/2776235 <i>Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 8, No. 1. (1998), pp. 13-14.</i><br /><br />Two class AB GaAs field-effect transistor (FET) power amplifiers have been designed and fabricated in the 4.4-4.8 GHz range. In the first case, a dielectric PBG line was incorporated in the design to tune the second harmonic. In the second case, a 50-Ω line is used with no harmonic tuning. The PBG structure allows broad-band harmonic tuning and is inexpensive to fabricate. A 5% improvement in power-added efficiency was achieved at the design frequency of 4.5 GHz, in both simulation and measurement Broad-band power amplifier using dielectric photonic bandgap structure V Radisic Y Qian T Itoh doi:10.1109/75.650973 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters], Vol. 8, No. 1. (1998), pp. 13-14. 2008-05-09T16:12:55-00:00 1998 Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters] 8 1 13 14 amplifier broadband pbg power http://www.citeulike.org/user/dcastro/article/2768630 <i>Antennas and Propagation Society International Symposium, 2001. IEEE, Vol. 2 (2001), pp. 490-493 vol.2.</i><br /><br />This paper presents a new diplexer using one-dimensional (1D) photonic band gap (PBG) structures to switch transmit/receive paths in a multiband transceiver antenna system. The 1D PBG structure consists of periodically etched holes on the ground plane along a microstrip-line. The new diplexer is optimized by parametric analysis, tapering and meandering of PBG bandstop filters, and full-wave simulation. A diplexer operating at four bands of 10, 12, 19, and 21 GHz is demonstrated with measured and simulated results. The new 1D PBG diplexer should be useful in multiband transceiver systems A new PBG diplexer for a multiband transceiver antenna system Tae-Yeoul Yun Kai Chang doi:10.1109/APS.2001.959768 Antennas and Propagation Society International Symposium, 2001. IEEE, Vol. 2 (2001), pp. 490-493 vol.2. 2008-05-08T06:28:49-00:00 2001 Antennas and Propagation Society International Symposium, 2001. IEEE 2 490 493 vol.2 antenna diplexer multiband pbg transceiver 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/2782065 <i>Microwave Conference, 2000 Asia-Pacific (2000), pp. 888-894.</i><br /><br />In this paper, we present two novel design architectures that utilizing either a periodic structure or an active integrated antenna (AIA) for harmonic tuning in transmitter front-end designs. These techniques promise to significantly improve the power amplifier efficiency, reduce losses and weight, as well as maintaining good linearity requirements of advanced wireless communication systems. We will illustrate these two concepts through several design examples that have been developed recently, including a power amplifier integrated with novel PBG ground plane for harmonic tuning and four push-pull PA design examples, where the AIA concept is implemented to allow antenna to serve as a power combiner, a harmonic tuning load, in addition to its original functionality as a radiating element High efficiency transmitter front-ends integrated with planar antennas and PBG CY Hang WR Deal Yongxi Qian T Itoh doi:10.1109/APMC.2000.925972 Microwave Conference, 2000 Asia-Pacific (2000), pp. 888-894. 2008-05-10T00:03:23-00:00 2000 Microwave Conference, 2000 Asia-Pacific 888 894 antenna efficiency front-end high integrated pbg planar transmitter http://www.citeulike.org/user/dcastro/article/2776197 <i>Antennas and Propagation, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1377-1381.</i><br /><br />The high-impedance surface was used as the antenna ground plane between two radiator elements to reduce the inter-element coupling between them. Measurement reveals the optimum performance occurred at the bandgap due to the suppression of surface currents in the ground plane. An application of high-impedance ground planes to phased array antennas RFJ Broas DF Sievenpiper E Yablonovitch doi:10.1109/TAP.2005.844408 Antennas and Propagation, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1377-1381. 2008-05-09T15:46:49-00:00 2005 Antennas and Propagation, IEEE Transactions on 53 4 1377 1381 antenna array high impedance pbg phased