The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
A.k. Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.
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Characteristics of circular patch on Thick Substrate and superstrate
IEEE Transactions on Antennas and Propagation, 1991Co-Authors: A.k. BhattacharyyaAbstract:Accurate formulation for the wall admittance of a circular patch on a Thick Substrate/superstrate is presented. The principle of equivalence is invoked at the physical aperture of the patch, which yields equivalent electric and magnetic surface currents for the outside fields. The unknown electric current, in terms of the aperture electric field, is obtained from the field continuity condition on the aperture surface. Numerical results reveal that for a small Substrate Thickness, the equivalent electric current may be ignored. It should, however, be included in the analysis for larger Substrate Thicknesses. Numerical results for the wall conductance, wall susceptance, and radiation efficiency of a patch with various Substrates and superstrates are presented.
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Wall admittance of a circular patch on Thick Substrate and superstrate
International Symposium on Antennas and Propagation Society Merging Technologies for the 90's, 1990Co-Authors: A.k. BhattacharyyaAbstract:The wall admittance of a circular patch on an electrically Thick Substrate is formulated. Both the electric and magnetic surface currents are considered to be the sources of outside radiation. For the external field, the analysis is carried out in the Hankel transformed domain. Numerical results for the resonant frequency and the input resistance at resonance are shown.
Adel Elsherbini - One of the best experts on this subject based on the ideXlab platform.
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Development of a Novel Uwb Vivaldi Antenna Array Using Siw Technology
Progress In Electromagnetics Research, 2009Co-Authors: Song Lin, Songnan Yang, Alaa El Din Mohamed Fathy, Adel ElsherbiniAbstract:A compact Vivaldi antenna array printed on Thick Substrate and fed by a Substrate Integrated Waveguides (SIW) structure has been developed. The antenna array utilizes a compact SIW binary divider to significantly minimize the feed structure insertion losses. The low-loss SIW binary divider has a common novel Grounded Coplanar Waveguide (GCPW) feed to provide a wideband transition to the SIW and to sustain a good input match while preventing higher order modes excitation. The antenna array was designed, fabricated, and thoroughly investigated. Detailed simulations of the antenna and its feed, in addition to its relevant measurements, will be presented in this paper.
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A highly efficient Vivaldi antenna array design on Thick Substrate and fed by SIW structure with integrated GCPW feed
2007 IEEE Antennas and Propagation Society International Symposium, 2007Co-Authors: Songnan Yang, Adel Elsherbini, Alaa El Din Mohamed Fathy, Aladin Kamel, Hadia ElhennawyAbstract:A compact Vivaldi antenna array printed on Thick Substrate and fed by a Substrate integrated waveguide (SIW) structure is presented here. The array utilizes an SIW binary splitter to significantly minimize the feed structure insertion losses. Meanwhile, the splitter is fed with an integrated CPW to sustain a good input match and prevent higher order modes excitation over wide band operation. Extensive simulation and measurements were carried out and was presented here with a comparison to previously developed arrays.
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Experimental development of a circularly polarized antipodal tapered slot antenna using SIW feed printed on Thick Substrate
2007 IEEE Antennas and Propagation Society International Symposium, 2007Co-Authors: Adel Elsherbini, Songnan Yang, Alaa El Din Mohamed Fathy, Aladin Kamel, Hadia ElhennawyAbstract:In this paper, we propose a SIW fed circularly polarized (CP) tapered slot antenna which have a good return loss and a wide band axial-ratio. The performance of the antenna has been extensively optimized based on both CST Microwave Studio and Ansoft-HFSS simulation to obtain wide band CP operation. In the following sections, we introduce the theory of operation, the details of the design and the measured results.
Kwan Lawrence Yeung - One of the best experts on this subject based on the ideXlab platform.
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Isolation Enhancement for MIMO Patch Antennas Sharing a Common Thick Substrate: Using a Dielectric Block to Control Space-Wave Coupling to Cancel Surface-Wave Coupling
IEEE Transactions on Antennas and Propagation, 1Co-Authors: Min Li, Jamal Muhammad Yasir, Lijun Jiang, Kwan Lawrence YeungAbstract:This paper presents a novel and simple decoupling method to increase isolation between two closely spaced patch antennas sharing a common Thick Substrate. The decoupling can be simply realized by adding a pure dielectric block (DB) above the coupled array. By means of DB to modify the space permittivity (propagation constant), the space-wave coupling can be controlled to cancel surface-wave coupling for isolation enhancement. Five benchmarks of combinations of two patch antennas with different positions or orientations are investigated to validate the decoupling concept and elaborate on the design procedure. Results show that the proposed method could provide over 20-dB isolation enhancements for patch antennas with 0.1-k0 or 0.027-k0 separation distances. Besides, wide isolation bandwidths and good radiation performances can be achieved for the DB-loaded antennas without reductions in total efficiency, front-to-back ratio (FBR), boresight gain, or polarization purity. Notably, the DB can be designed independently of the original array, making this method potential for some previously fabricated arrays without requiring modifying or replacing them with new ones.
F. Sizov - One of the best experts on this subject based on the ideXlab platform.
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Modeling of THz focal plane array on electrically Thick Substrate
2015 8th UK Europe China Millimeter Waves and THz Technology Workshop (UCMMT), 2015Co-Authors: M. Sakhno, J. Gumenjuk-sichevska, F. SizovAbstract:Implications of printed antennas usage in focal plane arrays on Thick Substrates are investigated. Two different ways of obtaining a good antenna pattern on electrically Thick Substrate of finite dimensions are proposed, namely, Substrate lenses placed on top of the antenna and holes going all the way through the Substrate. Patterns of detector element with planar antenna in the focal plane of the focusing system are studied. It is shown that antennas with a slanted main lobe or with multiple main lobes are not usable for imaging purposes.
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Modeling of printed antennas on electrically Thick subtrate for THz focal plane array
2015 International Young Scientists Forum on Applied Physics (YSF), 2015Co-Authors: M. Sakhno, J. Gumenjuk-sichevska, F. SizovAbstract:Implications of printed antennas usage on Thick Substrates in focal plane array are investigated. Patterns of detector element with planar antenna in the focal plane of focusing system where studied. It is shown that antenna with main lobe not normal to surface is not applicable for imaging purposes. Different ways of obtaining good antenna pattern on electrically Thick Substrate of finite dimensions, namely, Substrate lenses placed on a top of the antenna and holes through the Substrate are shown. It is shown that extended hemispherical Substrate lens begins to work from some critical radius and height.
Hadia Elhennawy - One of the best experts on this subject based on the ideXlab platform.
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A highly efficient Vivaldi antenna array design on Thick Substrate and fed by SIW structure with integrated GCPW feed
2007 IEEE Antennas and Propagation Society International Symposium, 2007Co-Authors: Songnan Yang, Adel Elsherbini, Alaa El Din Mohamed Fathy, Aladin Kamel, Hadia ElhennawyAbstract:A compact Vivaldi antenna array printed on Thick Substrate and fed by a Substrate integrated waveguide (SIW) structure is presented here. The array utilizes an SIW binary splitter to significantly minimize the feed structure insertion losses. Meanwhile, the splitter is fed with an integrated CPW to sustain a good input match and prevent higher order modes excitation over wide band operation. Extensive simulation and measurements were carried out and was presented here with a comparison to previously developed arrays.
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Experimental development of a circularly polarized antipodal tapered slot antenna using SIW feed printed on Thick Substrate
2007 IEEE Antennas and Propagation Society International Symposium, 2007Co-Authors: Adel Elsherbini, Songnan Yang, Alaa El Din Mohamed Fathy, Aladin Kamel, Hadia ElhennawyAbstract:In this paper, we propose a SIW fed circularly polarized (CP) tapered slot antenna which have a good return loss and a wide band axial-ratio. The performance of the antenna has been extensively optimized based on both CST Microwave Studio and Ansoft-HFSS simulation to obtain wide band CP operation. In the following sections, we introduce the theory of operation, the details of the design and the measured results.
