Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6904672
D. Kang, Jaehoon Choi
In this paper, a diversity antenna with slits for WBAN applications is proposed. The antenna consists of two T-shaped monopoles and three slits. Through three slits, a high isolation characteristic is achieved and the resonant frequency can be controlled. To analyze the antenna performance over a human body, the proposed antenna over a human equivalent flat phantom is investigated through simulation. A return loss characteristic of the antenna is insensitive to the existence of the phantom. The antenna operates in 2.4 GHz ISM band with the isolation higher than 23 dB.
{"title":"Diversity antenna with slits for WBAN applications","authors":"D. Kang, Jaehoon Choi","doi":"10.1109/APS.2014.6904672","DOIUrl":"https://doi.org/10.1109/APS.2014.6904672","url":null,"abstract":"In this paper, a diversity antenna with slits for WBAN applications is proposed. The antenna consists of two T-shaped monopoles and three slits. Through three slits, a high isolation characteristic is achieved and the resonant frequency can be controlled. To analyze the antenna performance over a human body, the proposed antenna over a human equivalent flat phantom is investigated through simulation. A return loss characteristic of the antenna is insensitive to the existence of the phantom. The antenna operates in 2.4 GHz ISM band with the isolation higher than 23 dB.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"1025 1","pages":"683-684"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77181008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6905082
C. Peng, I. Chen, L.-Q Chen
In this article, a dual-band aperture-coupled stacked circularly polarized microstrip antenna was proposed. This antenna consists of metallic square slot, metallic square patch, crossed aperture and microstrip feeding structure, making it easy to combine directional, circularly polarization and dual-band operation. The optimized antenna exhibits a good impedance matching within the UHF band (902MHz-928MHz) and ISM band (2.4GHz-2.5GHz). The experimental results of the constructed prototype are provided.
{"title":"Optimized design of dual-band aperture-coupled stacked circularly polarized microstrip antennas","authors":"C. Peng, I. Chen, L.-Q Chen","doi":"10.1109/APS.2014.6905082","DOIUrl":"https://doi.org/10.1109/APS.2014.6905082","url":null,"abstract":"In this article, a dual-band aperture-coupled stacked circularly polarized microstrip antenna was proposed. This antenna consists of metallic square slot, metallic square patch, crossed aperture and microstrip feeding structure, making it easy to combine directional, circularly polarization and dual-band operation. The optimized antenna exhibits a good impedance matching within the UHF band (902MHz-928MHz) and ISM band (2.4GHz-2.5GHz). The experimental results of the constructed prototype are provided.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"9 1","pages":"1512-1513"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80820556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6905207
W. Barott, B. Himed
Time-modulation is applied to an array pattern by alternating a beamformer between two sets of beamforming coefficients. These are selected so signals arriving in the sidelobes are BPSK modulated by the beam-switching while signals in the main lobe are not. This technique enables sidelobe blanking using a single beamformer, which is simpler than other approaches.
{"title":"Time modulated beamformer for sidelobe blanking","authors":"W. Barott, B. Himed","doi":"10.1109/APS.2014.6905207","DOIUrl":"https://doi.org/10.1109/APS.2014.6905207","url":null,"abstract":"Time-modulation is applied to an array pattern by alternating a beamformer between two sets of beamforming coefficients. These are selected so signals arriving in the sidelobes are BPSK modulated by the beam-switching while signals in the main lobe are not. This technique enables sidelobe blanking using a single beamformer, which is simpler than other approaches.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"5 1","pages":"1762-1763"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79536025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6905319
M. Morsy, Hemachandra Reddy Gorla
A new design of a miniaturized wide-band dielectric resonator antenna(DRA) at 2.45GHz is presented. The design employs two different techniques for widening the band width and miniaturizing the total size of the designed DRA. By suspending the dielectric resonator over a ground plane, we are able to increase the 10dB operating bandwidth of DRA to 34%. And by constructing a conducting wall on one side of the DRA, the total volume of the DRA antenna is reduced to 1.2×0.8×1.9cm3. Parametric studies and systematic analysis are used to reach the optimized design.
{"title":"Miniaturized wide-band dielectric resonator antenna for ISM applications","authors":"M. Morsy, Hemachandra Reddy Gorla","doi":"10.1109/APS.2014.6905319","DOIUrl":"https://doi.org/10.1109/APS.2014.6905319","url":null,"abstract":"A new design of a miniaturized wide-band dielectric resonator antenna(DRA) at 2.45GHz is presented. The design employs two different techniques for widening the band width and miniaturizing the total size of the designed DRA. By suspending the dielectric resonator over a ground plane, we are able to increase the 10dB operating bandwidth of DRA to 34%. And by constructing a conducting wall on one side of the DRA, the total volume of the DRA antenna is reduced to 1.2×0.8×1.9cm3. Parametric studies and systematic analysis are used to reach the optimized design.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"10 1","pages":"1984-1985"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85689534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6904386
A. Bisognin, D. Titz, C. Luxey, G. Jacquemod, R. Pilard, F. Gianesello, D. Gloria, F. Ferrero, D. Lugara, Jorge R. Costa, C. Fernandes
In this paper, we compare the performance of micromachined Teflon and 3D printed Plastic lenses for WiGig modules. Both are based on extended hemispherical shapes. Reusing a HDI module with built-in antenna as a source, we demonstrate an antenna gain improvement of respectively 9 dB and 11 dB for the Plastic and the Teflon lenses. Full-wave simulations are verified by measurements.
{"title":"Comparizon of 3D printed Plastic and micromachined Teflon Lenses for WiGig modules","authors":"A. Bisognin, D. Titz, C. Luxey, G. Jacquemod, R. Pilard, F. Gianesello, D. Gloria, F. Ferrero, D. Lugara, Jorge R. Costa, C. Fernandes","doi":"10.1109/APS.2014.6904386","DOIUrl":"https://doi.org/10.1109/APS.2014.6904386","url":null,"abstract":"In this paper, we compare the performance of micromachined Teflon and 3D printed Plastic lenses for WiGig modules. Both are based on extended hemispherical shapes. Reusing a HDI module with built-in antenna as a source, we demonstrate an antenna gain improvement of respectively 9 dB and 11 dB for the Plastic and the Teflon lenses. Full-wave simulations are verified by measurements.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"10 1","pages":"109-110"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84195411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6905449
S. Hughey, B. Shanker, A. Baczewski
Local transparent boundary conditions (TBCs) based upon the pole condition have shown a great deal of promise in recent years. Only recently has the pole condition been applied to the Maxwell Equations with the aid of vector Hardy space infinite elements [1]. In this work, we describe a variation on the conformal Finite Element formulation presented in [1] within an interior penalty Discontinuous Galerkin (DG) framework. Our primary reasons for doing so are the use of nonconformal meshing at the interior/exterior boundary and the use of locally-enriched function spaces to include desirable physics in numerical solutions.
{"title":"Formulation of the Hardy space method in a Discontinuous Galerkin framework","authors":"S. Hughey, B. Shanker, A. Baczewski","doi":"10.1109/APS.2014.6905449","DOIUrl":"https://doi.org/10.1109/APS.2014.6905449","url":null,"abstract":"Local transparent boundary conditions (TBCs) based upon the pole condition have shown a great deal of promise in recent years. Only recently has the pole condition been applied to the Maxwell Equations with the aid of vector Hardy space infinite elements [1]. In this work, we describe a variation on the conformal Finite Element formulation presented in [1] within an interior penalty Discontinuous Galerkin (DG) framework. Our primary reasons for doing so are the use of nonconformal meshing at the interior/exterior boundary and the use of locally-enriched function spaces to include desirable physics in numerical solutions.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"12 1","pages":"2244-2245"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78350752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6904488
S. Agneessens, H. Rogier, R. Moro, M. Bozzi
A compact, robust, wearable antenna for body-worn applications in the 2.4 GHz Industrial Medical and Scientific band is designed, fabricated and tested. This novel compact textile cavity backed slot antenna combines a half-mode substrate integrated waveguide topology with an additional row of shorting vias for miniaturization. Excellent free space performance is achieved with a measured 4.6 % impedance bandwidth, maximal gain of 4.7 dBi and radiation efficiency of 81.3 %. On-body measurements reveal minimal frequency detuning when the antenna is worn by a test subject as well as a negligible impedance bandwidth reduction to 4.5 %. The low calculated Specific Absorption Rate of 0.51 W/kg averaged over 1 g of tissue demonstrates high antenna body isolation. Therefore, this design is an attractive option as antenna in smart textile systems.
{"title":"Robust, wearable, on-body antenna relying on half mode substrate integrated waveguide techniques","authors":"S. Agneessens, H. Rogier, R. Moro, M. Bozzi","doi":"10.1109/APS.2014.6904488","DOIUrl":"https://doi.org/10.1109/APS.2014.6904488","url":null,"abstract":"A compact, robust, wearable antenna for body-worn applications in the 2.4 GHz Industrial Medical and Scientific band is designed, fabricated and tested. This novel compact textile cavity backed slot antenna combines a half-mode substrate integrated waveguide topology with an additional row of shorting vias for miniaturization. Excellent free space performance is achieved with a measured 4.6 % impedance bandwidth, maximal gain of 4.7 dBi and radiation efficiency of 81.3 %. On-body measurements reveal minimal frequency detuning when the antenna is worn by a test subject as well as a negligible impedance bandwidth reduction to 4.5 %. The low calculated Specific Absorption Rate of 0.51 W/kg averaged over 1 g of tissue demonstrates high antenna body isolation. Therefore, this design is an attractive option as antenna in smart textile systems.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"23 1","pages":"313-314"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77967646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6905356
Chien‐Hao Liu, J. Booske, N. Behdad
When operated in high-power pulsed systems, frequency selective surfaces (FSS) are susceptible to breakdown. Breakdown in these devices changes the frequency response of the device and can result in permanent damage in certain situations. Recently, it has been demonstrated that breakdown induced at a certain location in an FSS can result in breakdown at other locations (e.g. neighboring unit cells) where the intensity of the incident EM wave is not high enough to cause breakdown under normal circumstances. In this paper, we examine the physical cause of this phenomenon and demonstrate that this is caused by the generation of vacuum ultraviolet (VUV) radiation, at the location of the initial discharge, which facilitates breakdown at other locations. Furthermore, through a series of experimental studies, we identify the distances over which this VUV radiation has a high enough intensity to facilitate breakdown at the neighboring unit cells. The results presented in this paper are expected to be useful in mitigating and localizing the adverse impacts of breakdown in HPM FSSs covering large aperture dimensions or in designing devices that generate large scale breakdown (e.g. periodic plasmas).
{"title":"Investigating failure mechanisms in high-power microwave frequency selective surfaces","authors":"Chien‐Hao Liu, J. Booske, N. Behdad","doi":"10.1109/APS.2014.6905356","DOIUrl":"https://doi.org/10.1109/APS.2014.6905356","url":null,"abstract":"When operated in high-power pulsed systems, frequency selective surfaces (FSS) are susceptible to breakdown. Breakdown in these devices changes the frequency response of the device and can result in permanent damage in certain situations. Recently, it has been demonstrated that breakdown induced at a certain location in an FSS can result in breakdown at other locations (e.g. neighboring unit cells) where the intensity of the incident EM wave is not high enough to cause breakdown under normal circumstances. In this paper, we examine the physical cause of this phenomenon and demonstrate that this is caused by the generation of vacuum ultraviolet (VUV) radiation, at the location of the initial discharge, which facilitates breakdown at other locations. Furthermore, through a series of experimental studies, we identify the distances over which this VUV radiation has a high enough intensity to facilitate breakdown at the neighboring unit cells. The results presented in this paper are expected to be useful in mitigating and localizing the adverse impacts of breakdown in HPM FSSs covering large aperture dimensions or in designing devices that generate large scale breakdown (e.g. periodic plasmas).","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"11 1","pages":"2058-2059"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72836796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6904987
Jae Jeon, John T. Chang, A. Pham
A band-notched ultra-wideband equiangular spiral antenna is presented. With the spiral antenna on the top layer, bottom side is used for a secondary resonant structure to create a notch filter response. VSWR of 2:1 is achieved for the FCC UWB band, which is 3.1 to 10.6 GHz. Notch response is created over the IEEE 802.11a band, 5.15 to 5.85 GHz, VSWR reaching 12:1 at the center of the band at 5.5 GHz. Suppression of radiation in this band is evident in its gain profile over frequency and in current density plot around the resonant structure as well.
{"title":"Band-notched UWB equiangular spiral antenna","authors":"Jae Jeon, John T. Chang, A. Pham","doi":"10.1109/APS.2014.6904987","DOIUrl":"https://doi.org/10.1109/APS.2014.6904987","url":null,"abstract":"A band-notched ultra-wideband equiangular spiral antenna is presented. With the spiral antenna on the top layer, bottom side is used for a secondary resonant structure to create a notch filter response. VSWR of 2:1 is achieved for the FCC UWB band, which is 3.1 to 10.6 GHz. Notch response is created over the IEEE 802.11a band, 5.15 to 5.85 GHz, VSWR reaching 12:1 at the center of the band at 5.5 GHz. Suppression of radiation in this band is evident in its gain profile over frequency and in current density plot around the resonant structure as well.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"14 1","pages":"1323-1324"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73181479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6905136
A. Densmore, Y. Rahmat-Samii
The application of the graphics processor to computing antenna radiation patterns provides a substantial acceleration in speed. The same brute force physical optics (PO) code; e.g., a symmetric single reflector of two hundred forty wavelengths diameter, that runs single-threaded C/C++ on an Intel Core 2 Q8200 CPU and compiled to be optimized for speed, runs one hundred times faster when ported to OpenCL and run on an AMD HD5850 GPU hosted by the CPU system. Porting the code to OpenCL involves opening the processing loops to be run in parallel and some additional code to host the GPU in the CPU system. The ability to accelerate antenna pattern computations by a factor of one hundred provides real substantial benefits when many patterns need to be computed repeatedly, such as when optimizing a reflector system.
{"title":"OpenCL GPU 100× acceleration of physical optics","authors":"A. Densmore, Y. Rahmat-Samii","doi":"10.1109/APS.2014.6905136","DOIUrl":"https://doi.org/10.1109/APS.2014.6905136","url":null,"abstract":"The application of the graphics processor to computing antenna radiation patterns provides a substantial acceleration in speed. The same brute force physical optics (PO) code; e.g., a symmetric single reflector of two hundred forty wavelengths diameter, that runs single-threaded C/C++ on an Intel Core 2 Q8200 CPU and compiled to be optimized for speed, runs one hundred times faster when ported to OpenCL and run on an AMD HD5850 GPU hosted by the CPU system. Porting the code to OpenCL involves opening the processing loops to be run in parallel and some additional code to host the GPU in the CPU system. The ability to accelerate antenna pattern computations by a factor of one hundred provides real substantial benefits when many patterns need to be computed repeatedly, such as when optimizing a reflector system.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"7 1","pages":"1620-1621"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73312248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}