Pub Date : 2014-07-06DOI: 10.1109/APS.2014.6904932
J. Costantine, Y. Tawk, F. Ayoub, C. Christodoulou
In this paper we discuss an antenna system composed of a reconfigurable communicating antenna and a wideband antenna for sensing purposes. The communicating antenna is a microstrip antenna that is reconfigured by moving its ground plane in a vertical or tilting manner. The sensing antenna is a printed monopole antenna designed for wideband sensing. The whole system is compactly packed and software controlled by an Arduino Uno microcontroller.
{"title":"Software enabled cognitive radio antenna system","authors":"J. Costantine, Y. Tawk, F. Ayoub, C. Christodoulou","doi":"10.1109/APS.2014.6904932","DOIUrl":"https://doi.org/10.1109/APS.2014.6904932","url":null,"abstract":"In this paper we discuss an antenna system composed of a reconfigurable communicating antenna and a wideband antenna for sensing purposes. The communicating antenna is a microstrip antenna that is reconfigured by moving its ground plane in a vertical or tilting manner. The sensing antenna is a printed monopole antenna designed for wideband sensing. The whole system is compactly packed and software controlled by an Arduino Uno microcontroller.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"16 1","pages":"1210-1211"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73741361","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.2014.6905214
S. Ceccuzzi, C. Ponti, G. Schettini
In the millimeter frequency range, horn antennas are widespread components in high-directivity applications, but with the drawback of being heavy and bulky. To limit size and weight of such antennas, a lower gain must be accepted, as the radiative properties are dependent on the aperture extension and on the length. A cavity made from an Electromagnetic Band-Gap material can be successfully employed to overcome these limitations, when used as a superstrate of a shorter horn antenna. The new radiator has a wider extension but it is more suitable for low-profile applications.
{"title":"Enhancing the directivity of a short-length horn by an EBG cavity","authors":"S. Ceccuzzi, C. Ponti, G. Schettini","doi":"10.1109/APS.2014.6905214","DOIUrl":"https://doi.org/10.1109/APS.2014.6905214","url":null,"abstract":"In the millimeter frequency range, horn antennas are widespread components in high-directivity applications, but with the drawback of being heavy and bulky. To limit size and weight of such antennas, a lower gain must be accepted, as the radiative properties are dependent on the aperture extension and on the length. A cavity made from an Electromagnetic Band-Gap material can be successfully employed to overcome these limitations, when used as a superstrate of a shorter horn antenna. The new radiator has a wider extension but it is more suitable for low-profile applications.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"62 1","pages":"1776-1777"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75626543","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.2014.6904623
S. Koziel, A. Bekasiewicz
In this work, design of small antennas using efficient numerical optimization is investigated. We exploit variable-fidelity electromagnetic (EM) simulations and the adaptively adjusted design specifications (AADS) technique. Combination of these methods allows us to simultaneously adjust multiple geometry parameters of the antenna structure of interest in a computationally feasible manner, leading to substantial reduction of the antenna size while maintaining acceptable reflection level. Our approach is demonstrated using a UWB monopole.
{"title":"Small antenna design using surrogate-based optimization","authors":"S. Koziel, A. Bekasiewicz","doi":"10.1109/APS.2014.6904623","DOIUrl":"https://doi.org/10.1109/APS.2014.6904623","url":null,"abstract":"In this work, design of small antennas using efficient numerical optimization is investigated. We exploit variable-fidelity electromagnetic (EM) simulations and the adaptively adjusted design specifications (AADS) technique. Combination of these methods allows us to simultaneously adjust multiple geometry parameters of the antenna structure of interest in a computationally feasible manner, leading to substantial reduction of the antenna size while maintaining acceptable reflection level. Our approach is demonstrated using a UWB monopole.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"21 1","pages":"585-586"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75661790","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.2014.6905131
James Park, K. Ding, Zachariah Fuchs, Kristopher T. Kim, S. Mudaliar, W. G. Stevens, P. Tzanos
The results presented have shown that the polarization and radar geometry can significantly influence the Doppler spectra of inland reservoir surface clutter. The impact of polarization on the Doppler spectral width is analyzed by the decorrelation time from the autocorrelation function. In addition, the measured Doppler frequency shift induced by the motion of the reservoir surface depends on wind direction and measurement geometry. The extracted Doppler information is consistent with other measurements and theory.
{"title":"Polarimetric Doppler spectra of S-band inland reservoir clutter","authors":"James Park, K. Ding, Zachariah Fuchs, Kristopher T. Kim, S. Mudaliar, W. G. Stevens, P. Tzanos","doi":"10.1109/APS.2014.6905131","DOIUrl":"https://doi.org/10.1109/APS.2014.6905131","url":null,"abstract":"The results presented have shown that the polarization and radar geometry can significantly influence the Doppler spectra of inland reservoir surface clutter. The impact of polarization on the Doppler spectral width is analyzed by the decorrelation time from the autocorrelation function. In addition, the measured Doppler frequency shift induced by the motion of the reservoir surface depends on wind direction and measurement geometry. The extracted Doppler information is consistent with other measurements and theory.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"123 1","pages":"1610-1611"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75673340","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.2014.6904755
J. Bito, B. Tehrani, B. Cook, M. Tentzeris
A fully inkjet-printed multi-layer microstrip patch antenna with a CPW to microstrip line transition is designed and demonstrated for the first time in this paper. Both metallic layers and SU-8 substrate are fabricated with an additive inkjet printing process. The patch antenna is designed to operate at 14 GHz, and the operation of the antenna is confirmed in measurement validating that fully additively-processed RF devices are a new option for post processing RF devices with substrate independence.
{"title":"Fully inkjet-printed multilayer microstrip patch antenna for Ku-band applications","authors":"J. Bito, B. Tehrani, B. Cook, M. Tentzeris","doi":"10.1109/APS.2014.6904755","DOIUrl":"https://doi.org/10.1109/APS.2014.6904755","url":null,"abstract":"A fully inkjet-printed multi-layer microstrip patch antenna with a CPW to microstrip line transition is designed and demonstrated for the first time in this paper. Both metallic layers and SU-8 substrate are fabricated with an additive inkjet printing process. The patch antenna is designed to operate at 14 GHz, and the operation of the antenna is confirmed in measurement validating that fully additively-processed RF devices are a new option for post processing RF devices with substrate independence.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"303 1","pages":"854-855"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74385608","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.2014.6904779
Shang-Hua Yang, M. R. Hashemi, C. Berry, M. Jarrahi
We present a high-efficiency photoconductive antenna that incorporates three-dimensional plasmonic contact electrodes. Three-dimensional plasmonic contact electrodes facilitate ultrafast transport of the majority of photocarriers to the contact electrodes, enhancing the device quantum efficiency significantly. Under an optical pump power of 1.4 mW, we experimentally demonstrate 105 μW broadband terahertz radiation in 0.1-2 THz frequency range, exhibiting a record-high optical-to-terahertz conversion efficiency of 7.5%.
{"title":"High-efficiency photoconductive terahertz antennas based on high-aspect ratio plasmonic electrodes","authors":"Shang-Hua Yang, M. R. Hashemi, C. Berry, M. Jarrahi","doi":"10.1109/APS.2014.6904779","DOIUrl":"https://doi.org/10.1109/APS.2014.6904779","url":null,"abstract":"We present a high-efficiency photoconductive antenna that incorporates three-dimensional plasmonic contact electrodes. Three-dimensional plasmonic contact electrodes facilitate ultrafast transport of the majority of photocarriers to the contact electrodes, enhancing the device quantum efficiency significantly. Under an optical pump power of 1.4 mW, we experimentally demonstrate 105 μW broadband terahertz radiation in 0.1-2 THz frequency range, exhibiting a record-high optical-to-terahertz conversion efficiency of 7.5%.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"1 1","pages":"902-903"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74726783","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.2014.6904505
A. Sahu, Bethany Grayczyk, M. Almalkawi, V. Devabhaktuni, P. Aaen
This paper demonstrates a new concept of multilayered patterned ground shield (PGS) for improving Q-factor of a Si-based spiral inductor. The impact of left-handed behavior of complementary split ring resonator (CSRR) and split ring resonator (SRR) patterns to realize a high inductance in the ground shield is explained through an equivalent circuit model. The proposed two layer patterned ground shield is shown to improve the Q-value of on-chip spiral inductors by 23.7%.
{"title":"High-Q spiral inductors with multilayered split-ring resonator (SRR) patterned ground shields","authors":"A. Sahu, Bethany Grayczyk, M. Almalkawi, V. Devabhaktuni, P. Aaen","doi":"10.1109/APS.2014.6904505","DOIUrl":"https://doi.org/10.1109/APS.2014.6904505","url":null,"abstract":"This paper demonstrates a new concept of multilayered patterned ground shield (PGS) for improving Q-factor of a Si-based spiral inductor. The impact of left-handed behavior of complementary split ring resonator (CSRR) and split ring resonator (SRR) patterns to realize a high inductance in the ground shield is explained through an equivalent circuit model. The proposed two layer patterned ground shield is shown to improve the Q-value of on-chip spiral inductors by 23.7%.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"22 1","pages":"346-347"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72769494","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.2014.6904368
Mohammad Zomorrodi, N. Karmakar
An array of four printed dipole antennas is developed at 60GHz for Image-based chipless RFID application. The dipoles are built on both sides of the Takonic TLX-8 (εr=2.55) and fed through a Co-planar waveguide (CPW) line. The total array dimension including its long feed line is 24×14 mm. An excellent wide radiation pattern in the azimuth direction is tested. The measured gain of the array is between 5.5 and 7 dBi over the frequency range of 57-64 GHz and the cross-polarization ratio is less than -18dB. The printable structure, wide radiation pattern, low return loss, wide bandwidth and high cross-polarization ratio of the proposed array suggest it as a suitable antenna for many applications in mm-wave range including chipless RFID systems.
{"title":"An array of printed dipoles at 60 GHz","authors":"Mohammad Zomorrodi, N. Karmakar","doi":"10.1109/APS.2014.6904368","DOIUrl":"https://doi.org/10.1109/APS.2014.6904368","url":null,"abstract":"An array of four printed dipole antennas is developed at 60GHz for Image-based chipless RFID application. The dipoles are built on both sides of the Takonic TLX-8 (εr=2.55) and fed through a Co-planar waveguide (CPW) line. The total array dimension including its long feed line is 24×14 mm. An excellent wide radiation pattern in the azimuth direction is tested. The measured gain of the array is between 5.5 and 7 dBi over the frequency range of 57-64 GHz and the cross-polarization ratio is less than -18dB. The printable structure, wide radiation pattern, low return loss, wide bandwidth and high cross-polarization ratio of the proposed array suggest it as a suitable antenna for many applications in mm-wave range including chipless RFID systems.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"6 1","pages":"73-74"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75712492","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.2014.6904947
S. Hrabar, B. Okorn, Vedran Ciganović, I. Krois
The `parasitics' of realistic non-Foster elements limit performance of recently introduced broadband active metamaterials and associated devices. Here, we present a very simple and clear explanation of this non-ideal behavior, based on the inevitable delay and frequency characteristic of used active component. Finally, it is shown that presented analysis can be used for the design of non-Foster elements with substantially decreased parasitics, which enables practical realization of stable superluminal transmission lines with many unit cells.
{"title":"Ideal versus realistic non-Foster elements in active metamaterials","authors":"S. Hrabar, B. Okorn, Vedran Ciganović, I. Krois","doi":"10.1109/APS.2014.6904947","DOIUrl":"https://doi.org/10.1109/APS.2014.6904947","url":null,"abstract":"The `parasitics' of realistic non-Foster elements limit performance of recently introduced broadband active metamaterials and associated devices. Here, we present a very simple and clear explanation of this non-ideal behavior, based on the inevitable delay and frequency characteristic of used active component. Finally, it is shown that presented analysis can be used for the design of non-Foster elements with substantially decreased parasitics, which enables practical realization of stable superluminal transmission lines with many unit cells.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"19 1","pages":"1240-1241"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73708743","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.2014.6905138
A. Capozzoli, C. Curcio, A. Liseno
We present the development of a fully parallel Magnetic Resonance Imaging algorithm written in CUDA language capable to very quickly process data collected under non-conventional (e.g., spiral) acquisition schemes.
{"title":"Accelerating NMR reconstructions with GPUs using cuBLAS and parallel NUFFT algorithms","authors":"A. Capozzoli, C. Curcio, A. Liseno","doi":"10.1109/APS.2014.6905138","DOIUrl":"https://doi.org/10.1109/APS.2014.6905138","url":null,"abstract":"We present the development of a fully parallel Magnetic Resonance Imaging algorithm written in CUDA language capable to very quickly process data collected under non-conventional (e.g., spiral) acquisition schemes.","PeriodicalId":6663,"journal":{"name":"2014 IEEE Antennas and Propagation Society International Symposium (APSURSI)","volume":"117 1","pages":"1624-1625"},"PeriodicalIF":0.0,"publicationDate":"2014-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73717751","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}
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