Pub Date : 2011-07-03DOI: 10.1109/APS.2011.5996437
Y. Aoki, H. Deguchi, M. Tsuji
This paper proposes an optimization design method to obtain arbitrarily-shaped conductive elements for microstrip reflectarrays. Such arbitrarily-shaped elements are determined by using the genetic algorithm (GA) based on a spectral-domain moment method. The validity of the designed elements is presented by comparing the calculated reflection-phase property for a periodic reflectarray with the measured one. Finally, the effectiveness of the proposed elements is verified by discussing radiation characteristics of the fabricated offset reflectarray numerically and experimentally.
{"title":"Reflectarray with arbitrarily-shaped conductive elements optimized by genetic algorithm","authors":"Y. Aoki, H. Deguchi, M. Tsuji","doi":"10.1109/APS.2011.5996437","DOIUrl":"https://doi.org/10.1109/APS.2011.5996437","url":null,"abstract":"This paper proposes an optimization design method to obtain arbitrarily-shaped conductive elements for microstrip reflectarrays. Such arbitrarily-shaped elements are determined by using the genetic algorithm (GA) based on a spectral-domain moment method. The validity of the designed elements is presented by comparing the calculated reflection-phase property for a periodic reflectarray with the measured one. Finally, the effectiveness of the proposed elements is verified by discussing radiation characteristics of the fabricated offset reflectarray numerically and experimentally.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"7 1","pages":"960-963"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81797963","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 : 2011-07-03DOI: 10.1109/APS.2011.5996475
B. Mrdakovic, B. Kolundžija
We present one application of using of surface equivalence theorem for calculation the electromagnetic shielding efficiency. The problem we concerned is conductive spherical shell illuminated by an incident plane wave. The model is simulated by using MoM SIE based code, where theorem of surface equivalence is used in order to minimize propagation of numerical error through walls of the cavity. Simulation results are compared with analytical solution, and very good matching is obtained.
{"title":"Application of surface equivalence theorem for characterization of electromagnetic shielding efficiency","authors":"B. Mrdakovic, B. Kolundžija","doi":"10.1109/APS.2011.5996475","DOIUrl":"https://doi.org/10.1109/APS.2011.5996475","url":null,"abstract":"We present one application of using of surface equivalence theorem for calculation the electromagnetic shielding efficiency. The problem we concerned is conductive spherical shell illuminated by an incident plane wave. The model is simulated by using MoM SIE based code, where theorem of surface equivalence is used in order to minimize propagation of numerical error through walls of the cavity. Simulation results are compared with analytical solution, and very good matching is obtained.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"5 1","pages":"1106-1109"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81937325","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 : 2011-07-03DOI: 10.1109/APS.2011.5996783
Robert. Gardner, Leigh Gardner
Since the first NEM in Albuquerque in 1978, the Electromagnetics Meetings have attracted an increasingly international range of scholars. This paper will explore the context of this internationalization, including the end of the Cold War, and the contribution of the SUMMA Foundation to the development of the discipline under the leadership of Dr. Carl Baum. These meetings, along with the EMP Note Series represent some of Dr. Baum's most important legacies.
{"title":"The summa foundation and the internationalization of the electromagnetics meetings, 1973-2010","authors":"Robert. Gardner, Leigh Gardner","doi":"10.1109/APS.2011.5996783","DOIUrl":"https://doi.org/10.1109/APS.2011.5996783","url":null,"abstract":"Since the first NEM in Albuquerque in 1978, the Electromagnetics Meetings have attracted an increasingly international range of scholars. This paper will explore the context of this internationalization, including the end of the Cold War, and the contribution of the SUMMA Foundation to the development of the discipline under the leadership of Dr. Carl Baum. These meetings, along with the EMP Note Series represent some of Dr. Baum's most important legacies.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"58 1","pages":"607-608"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84586247","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 : 2011-07-03DOI: 10.1109/APS.2011.5996462
T. Ueda, Shintaro Yamamoto, Y. Kado
A new type of beam scanning traveling-wave-resonator antenna is proposed and demonstrated numerically. It is composed of a finite-long and straight nonreciprocal transmission-line resonator and the feed line. The resonator section comprises of a nonreciprocal phase-shift composite right/ left handed transmission line with both ends open or shorted. The operational frequency of the antenna is not determined by the total size of the resonator, but by the configuration of the unit cell. The resonator section has field profiles with uniform magnitude and linearly-varying phase distribution along the resonator. Therefore, the gain and directivity of the antenna are enhanced with total length of the resonator section. The slope of the phase distribution on the resonator as well as the radiation angle of the antenna is continuously varied with the nonreciprocal characteristics of the transmission line, for example, by changing the applied dc magnetic field.
{"title":"Beam-scanning traveling-wave-resonator antenna based on nonreciprocal phase-shift CRLH transmission lines","authors":"T. Ueda, Shintaro Yamamoto, Y. Kado","doi":"10.1109/APS.2011.5996462","DOIUrl":"https://doi.org/10.1109/APS.2011.5996462","url":null,"abstract":"A new type of beam scanning traveling-wave-resonator antenna is proposed and demonstrated numerically. It is composed of a finite-long and straight nonreciprocal transmission-line resonator and the feed line. The resonator section comprises of a nonreciprocal phase-shift composite right/ left handed transmission line with both ends open or shorted. The operational frequency of the antenna is not determined by the total size of the resonator, but by the configuration of the unit cell. The resonator section has field profiles with uniform magnitude and linearly-varying phase distribution along the resonator. Therefore, the gain and directivity of the antenna are enhanced with total length of the resonator section. The slope of the phase distribution on the resonator as well as the radiation angle of the antenna is continuously varied with the nonreciprocal characteristics of the transmission line, for example, by changing the applied dc magnetic field.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"18 1","pages":"1058-1061"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84833953","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 : 2011-07-03DOI: 10.1109/APS.2011.5997093
Jiruo Ye, M. Jin, G. Pan
Employing the MFIE, we studied scattering of a Gaussian-like beam from a surface consisting of PEC conical array. The Coifman wavelet (Coiflet) based Galerkin procedure has reduced the computational burden by two orders of magnitude while retaining high precision.
{"title":"Scattering of tapered waves from array of sharp PEC cones","authors":"Jiruo Ye, M. Jin, G. Pan","doi":"10.1109/APS.2011.5997093","DOIUrl":"https://doi.org/10.1109/APS.2011.5997093","url":null,"abstract":"Employing the MFIE, we studied scattering of a Gaussian-like beam from a surface consisting of PEC conical array. The Coifman wavelet (Coiflet) based Galerkin procedure has reduced the computational burden by two orders of magnitude while retaining high precision.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"15 1","pages":"2742-2745"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85134773","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 : 2011-07-03DOI: 10.1109/APS.2011.5996772
Farah Nadia Mohd lsa, P. Brennan
This paper presents the design and construction of a microstrip array antenna operating at 5.3 GHz, to be used as an avalanche sensor in avalanche measurement. The advantage of the antenna is it can achieve a high gain of 15.6 dB with bandwidth of 90%. This was achieved by separating the feed network from the main patches; and increasing the antenna height by installing the feed layer at the back of the patch layer, sharing the same ground plane. In order to ensure the power is transferred smoothly from the main input port, the feed is design in novel spider like tapered feed network while ensuring the overall antenna function is not compromised.
{"title":"Design of a high gain & ultra wideband microstrip array antenna for avalanche radar","authors":"Farah Nadia Mohd lsa, P. Brennan","doi":"10.1109/APS.2011.5996772","DOIUrl":"https://doi.org/10.1109/APS.2011.5996772","url":null,"abstract":"This paper presents the design and construction of a microstrip array antenna operating at 5.3 GHz, to be used as an avalanche sensor in avalanche measurement. The advantage of the antenna is it can achieve a high gain of 15.6 dB with bandwidth of 90%. This was achieved by separating the feed network from the main patches; and increasing the antenna height by installing the feed layer at the back of the patch layer, sharing the same ground plane. In order to ensure the power is transferred smoothly from the main input port, the feed is design in novel spider like tapered feed network while ensuring the overall antenna function is not compromised.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"45 1","pages":"569-572"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76819529","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 : 2011-07-03DOI: 10.1109/APS.2011.5996609
M. El-Shenawee, P. Blake, A. M. Hassan, D. Roper
Numerical and fabrication investigations of gold nanoring finite arrays are presented. Surface plasmon resonances are computed using the method of moment surface integral equation. The nanoring arrays are fabrication via electron beam lithography templating and electroless gold plating. The results show the change of surface plasmons resonances, to larger wavelengths, when the nanoring thickness decreases. Also, the array size and the separation distance factors influence the amplitude of the extinction coefficients along with the resonance wavelength.
{"title":"Surface plasmons of finite nanoring arrays","authors":"M. El-Shenawee, P. Blake, A. M. Hassan, D. Roper","doi":"10.1109/APS.2011.5996609","DOIUrl":"https://doi.org/10.1109/APS.2011.5996609","url":null,"abstract":"Numerical and fabrication investigations of gold nanoring finite arrays are presented. Surface plasmon resonances are computed using the method of moment surface integral equation. The nanoring arrays are fabrication via electron beam lithography templating and electroless gold plating. The results show the change of surface plasmons resonances, to larger wavelengths, when the nanoring thickness decreases. Also, the array size and the separation distance factors influence the amplitude of the extinction coefficients along with the resonance wavelength.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"665 1","pages":"1609-1612"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76852257","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 : 2011-07-03DOI: 10.1109/APS.2011.5996641
H. Chou, Pai-Han Hsueh, Tso-Ming Hung, Li-Ruei Kuo
A dual-band design of reflectarray antennas for the RFID applications operated at 0.9 and 2.4 GHz is presented. In this design, the fields radiated from the antenna will focus in the near-zone of array aperture. Numerical investigations on the radiation characteristics of this reflectarray, as well as an experimental validation, are presented to demonstrate its feasibility.
{"title":"Near-zone focused radiations of reflectarray antennas for RFID applications at 0.9 and 2.4 GHz","authors":"H. Chou, Pai-Han Hsueh, Tso-Ming Hung, Li-Ruei Kuo","doi":"10.1109/APS.2011.5996641","DOIUrl":"https://doi.org/10.1109/APS.2011.5996641","url":null,"abstract":"A dual-band design of reflectarray antennas for the RFID applications operated at 0.9 and 2.4 GHz is presented. In this design, the fields radiated from the antenna will focus in the near-zone of array aperture. Numerical investigations on the radiation characteristics of this reflectarray, as well as an experimental validation, are presented to demonstrate its feasibility.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"14 1","pages":"1727-1730"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76913474","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 : 2011-07-03DOI: 10.1109/APS.2011.5996568
Djaiz Azzeddine, Nedil Mourad, Denidni A. Tayeb, H. Adnane
In this work, a triangular slot UWB antenna was proposed. This antenna is composed of a triangular slot fed with a microstrip triangular patch by coupling effect. This allows optimizing the size, the performances, and the characteristics of the UWB system. It can be noted that the VSWR is less than 2 over the entire bandwidth, from 3 GHz to 10.6 GHz. The proposed UWB antenna meets the FCC bandwidth authorization. Good results in terms of performance, bandwidth, gain, and radiation stability are obtained.
{"title":"Design of UWB triangular slot antenna","authors":"Djaiz Azzeddine, Nedil Mourad, Denidni A. Tayeb, H. Adnane","doi":"10.1109/APS.2011.5996568","DOIUrl":"https://doi.org/10.1109/APS.2011.5996568","url":null,"abstract":"In this work, a triangular slot UWB antenna was proposed. This antenna is composed of a triangular slot fed with a microstrip triangular patch by coupling effect. This allows optimizing the size, the performances, and the characteristics of the UWB system. It can be noted that the VSWR is less than 2 over the entire bandwidth, from 3 GHz to 10.6 GHz. The proposed UWB antenna meets the FCC bandwidth authorization. Good results in terms of performance, bandwidth, gain, and radiation stability are obtained.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"40 1","pages":"1456-1458"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81124735","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 : 2011-07-03DOI: 10.1109/APS.2011.5996856
A. C. Durgun, C. Balanis, C. Birtcher
This paper presents the fabrication and reflection phase measurements of a flexible high impedance surface (FHIS). The surface is fabricated by using DuPont pyralux polyimide as the substrate. Cyanoacrylate is used to adhere the samples of polyimide. The reflection phase response of the FHIS, which is curved in the form of a cylinder, is measured in the anechoic chamber and compared with that of the flat FHIS. As expected, reflection phase characteristics of the curved FHIS are polarization dependent and slightly different than those of the flat one. The measured reflection phase characteristics of the curved FHIS will be compared with simulations which presently are under consideration.
{"title":"Physical realization and reflection phase characteristics of a flexible high impedance surface","authors":"A. C. Durgun, C. Balanis, C. Birtcher","doi":"10.1109/APS.2011.5996856","DOIUrl":"https://doi.org/10.1109/APS.2011.5996856","url":null,"abstract":"This paper presents the fabrication and reflection phase measurements of a flexible high impedance surface (FHIS). The surface is fabricated by using DuPont pyralux polyimide as the substrate. Cyanoacrylate is used to adhere the samples of polyimide. The reflection phase response of the FHIS, which is curved in the form of a cylinder, is measured in the anechoic chamber and compared with that of the flat FHIS. As expected, reflection phase characteristics of the curved FHIS are polarization dependent and slightly different than those of the flat one. The measured reflection phase characteristics of the curved FHIS will be compared with simulations which presently are under consideration.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"37 1","pages":"1844-1847"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85812083","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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