Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711095
A. Toccafondi, S. Maci, A. Polemi, M. Albani, F. Capolino
In this paper a brief overview of the incremental theory of diffraction has been presented, of which Prof. Tiberio was the principal author and the main source of inspiration of our contributions. This activity covers only a very small part of his overall significant research contributions in high-frequency electromagnetic, to which he has indefatigably dedicated until he passed away. However, in this short paper, it has not been possible to describe also the excellent human qualities of Roberto. He was a unique individual and we also know we will all keep his memory alive
{"title":"The Contributions of Prof. Roberto Tiberio to the Incremental Theory of Diffraction for Electromagnetic","authors":"A. Toccafondi, S. Maci, A. Polemi, M. Albani, F. Capolino","doi":"10.1109/APS.2006.1711095","DOIUrl":"https://doi.org/10.1109/APS.2006.1711095","url":null,"abstract":"In this paper a brief overview of the incremental theory of diffraction has been presented, of which Prof. Tiberio was the principal author and the main source of inspiration of our contributions. This activity covers only a very small part of his overall significant research contributions in high-frequency electromagnetic, to which he has indefatigably dedicated until he passed away. However, in this short paper, it has not been possible to describe also the excellent human qualities of Roberto. He was a unique individual and we also know we will all keep his memory alive","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"33 1","pages":"2461-2464"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77899584","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 : 2006-07-09DOI: 10.1109/APS.2006.1710561
C. Qiu, Lewei Li, H. Yao, S. Zouhdi
This paper focuses on not only the isotropic chiral but also gyrotropic chiral materials with primary interest in dispersion, realization of double negative materials (DNG) and negative refractive index. To take into account the dispersion, the Condon model together with Tellegen's definition of chiral media is used for the frequency dependence of three parameters (permittivity, permeability and chirality). We also consider the equivalent permittivity and permeability of isotropic chiral media which is frequency dependent. As a generalized case, gyrotropic chiral media is studied since the gyrotropic parameters in epsilowbar and mulowbar tensors favor the realization of DNG and negative-index materials (NIM)
{"title":"Isotropic and gyrotropic chiral composite materials: dispersion and negative refractive index","authors":"C. Qiu, Lewei Li, H. Yao, S. Zouhdi","doi":"10.1109/APS.2006.1710561","DOIUrl":"https://doi.org/10.1109/APS.2006.1710561","url":null,"abstract":"This paper focuses on not only the isotropic chiral but also gyrotropic chiral materials with primary interest in dispersion, realization of double negative materials (DNG) and negative refractive index. To take into account the dispersion, the Condon model together with Tellegen's definition of chiral media is used for the frequency dependence of three parameters (permittivity, permeability and chirality). We also consider the equivalent permittivity and permeability of isotropic chiral media which is frequency dependent. As a generalized case, gyrotropic chiral media is studied since the gyrotropic parameters in epsilowbar and mulowbar tensors favor the realization of DNG and negative-index materials (NIM)","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"36 1","pages":"471-474"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79810107","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 : 2006-07-09DOI: 10.1109/APS.2006.1711426
U. Bombale, S. Gupta
In this paper a new method of improving bandwidth is discussed. In microstrip antenna various types of fields are produced, out of these very few are responsible for producing far field radiations or useful radiations. In this paper methods are discussed to enhance the useful (which produce far field radiations) fields by making the size of ground plane smaller than radiating patch. This increases the bandwidth to a very large extent. An antenna is designed to give bandwidth from 0.5 GHz to 6.8 GHz using only ground and radiating patch. Effect of using slotted ground on the bandwidth is also observed using Sierpinski gasket antenna. The antennas are designed and simulated using Agilents ADS 2003A momentum software
{"title":"Design of Ultra Wideband Microstrip Antenna","authors":"U. Bombale, S. Gupta","doi":"10.1109/APS.2006.1711426","DOIUrl":"https://doi.org/10.1109/APS.2006.1711426","url":null,"abstract":"In this paper a new method of improving bandwidth is discussed. In microstrip antenna various types of fields are produced, out of these very few are responsible for producing far field radiations or useful radiations. In this paper methods are discussed to enhance the useful (which produce far field radiations) fields by making the size of ground plane smaller than radiating patch. This increases the bandwidth to a very large extent. An antenna is designed to give bandwidth from 0.5 GHz to 6.8 GHz using only ground and radiating patch. Effect of using slotted ground on the bandwidth is also observed using Sierpinski gasket antenna. The antennas are designed and simulated using Agilents ADS 2003A momentum software","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"44 1","pages":"3705-3708"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80266253","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 : 2006-07-09DOI: 10.1109/APS.2006.1710828
S. Mahmoud, Y. Antar, A. Etrough, A. Freundorfer
Gain enhancement of simple sources embedded within a 3-layer planar dielectric structure is treated rigorously. Rigorous antenna pattern and gain are deduced in simple forms. Comparison with the leaky wave approach introduced earlier by Jackson and Oliner confirm the validity of this approach under high permittivity of the substrate and the resonance thickness of the layers
{"title":"Gain Enhancement of a Slot Dipole in a Three Dielectric Layers Structure","authors":"S. Mahmoud, Y. Antar, A. Etrough, A. Freundorfer","doi":"10.1109/APS.2006.1710828","DOIUrl":"https://doi.org/10.1109/APS.2006.1710828","url":null,"abstract":"Gain enhancement of simple sources embedded within a 3-layer planar dielectric structure is treated rigorously. Rigorous antenna pattern and gain are deduced in simple forms. Comparison with the leaky wave approach introduced earlier by Jackson and Oliner confirm the validity of this approach under high permittivity of the substrate and the resonance thickness of the layers","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"69 1","pages":"1465-1468"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80278655","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 : 2006-07-09DOI: 10.1109/APS.2006.1711425
Ming Lee, B. Kramer, Chi-Chih Chen, J. Volakis
In this paper, the miniaturization limit of a spiral antenna is considered by using both Chu's limit theory and spiral-specific impedance analysis. This study identifies mechanisms responsible for the spiral miniaturization limit
{"title":"Broadband Spiral Antenna Miniaturization Limit","authors":"Ming Lee, B. Kramer, Chi-Chih Chen, J. Volakis","doi":"10.1109/APS.2006.1711425","DOIUrl":"https://doi.org/10.1109/APS.2006.1711425","url":null,"abstract":"In this paper, the miniaturization limit of a spiral antenna is considered by using both Chu's limit theory and spiral-specific impedance analysis. This study identifies mechanisms responsible for the spiral miniaturization limit","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"18 1","pages":"3701-3704"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81586375","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 : 2006-07-09DOI: 10.1109/APS.2006.1711701
K. Yonezawa, H. Ishikawa, Y. Takeuchi
This paper presents a frequency range extended path loss prediction formula based on the measurement results using multiple frequency bands from 0.8 to 8 GHz, where the BS antenna height is lower than the surrounding buildings. Although the lower and narrower frequency bands are assigned to the current cellular/mobile systems, the higher and wider frequency bands should be allocated to the future mobile systems for providing broadband multimedia wireless communications services. And the future mobile systems are assumed to be the multi-mode systems including the existing systems in the lower band. The proposed path loss prediction formula should be applicable to wider frequency range (from 0.8 to 8 GHz) and will be able to contribute to the cell design for the future mobile systems
{"title":"Frequency range extension of path loss prediction formula for over-rooftops propagation in microwave band","authors":"K. Yonezawa, H. Ishikawa, Y. Takeuchi","doi":"10.1109/APS.2006.1711701","DOIUrl":"https://doi.org/10.1109/APS.2006.1711701","url":null,"abstract":"This paper presents a frequency range extended path loss prediction formula based on the measurement results using multiple frequency bands from 0.8 to 8 GHz, where the BS antenna height is lower than the surrounding buildings. Although the lower and narrower frequency bands are assigned to the current cellular/mobile systems, the higher and wider frequency bands should be allocated to the future mobile systems for providing broadband multimedia wireless communications services. And the future mobile systems are assumed to be the multi-mode systems including the existing systems in the lower band. The proposed path loss prediction formula should be applicable to wider frequency range (from 0.8 to 8 GHz) and will be able to contribute to the cell design for the future mobile systems","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"11 1","pages":"4747-4750"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84359077","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 : 2006-07-09DOI: 10.1109/APS.2006.1711691
C.H. Chen, B. Hu, Z. Wu, E. Yung
This paper presents the design of self-matching hemispherical helical antenna. The obtained experimental and simulated results show that adding the copper strip can both match the antenna and maintain its circularly polarized (CP) performance. This technique makes the proposed hemispherical helical antenna more attractable in satellite communication
{"title":"A Self-matching Hemispherical Helical Antenna","authors":"C.H. Chen, B. Hu, Z. Wu, E. Yung","doi":"10.1109/APS.2006.1711691","DOIUrl":"https://doi.org/10.1109/APS.2006.1711691","url":null,"abstract":"This paper presents the design of self-matching hemispherical helical antenna. The obtained experimental and simulated results show that adding the copper strip can both match the antenna and maintain its circularly polarized (CP) performance. This technique makes the proposed hemispherical helical antenna more attractable in satellite communication","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"58 1","pages":"4709-4712"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84567115","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 : 2006-07-09DOI: 10.1109/APS.2006.1710709
S. Serkan Basat, S. Bhattacharya, Li Yang, A. Rida, M. Tentzeris, J. Laskar
In this paper, the design and development of a unique high read-range high-efficiency (95%) radio frequency identification (RFID) antenna for the 915 MHz UHF band is discussed. The RFID exceptional characteristics are investigated in terms of antenna-IC matching and radiation efficiency. This 915 MHz passive tag is a 3" times 3" omnidirectional tag and yielded a read range of 31 feet compared to a 4" times 4" leading commercial design of 26 feet tested range in lab. This tag also possesses higher read power range (-7 dBm to 30 dBm) than the leading commercial design (-5 dBm to 30 dBm). The proposed RFID antenna was fabricated on 50.8 micron thick liquid crystal polymer (LCP) and the read range of the proposed RFID tags was experimentally verified
{"title":"Design of a novel high-efficiency UHF RFID antenna on flexible LCP substrate with high read-range capability","authors":"S. Serkan Basat, S. Bhattacharya, Li Yang, A. Rida, M. Tentzeris, J. Laskar","doi":"10.1109/APS.2006.1710709","DOIUrl":"https://doi.org/10.1109/APS.2006.1710709","url":null,"abstract":"In this paper, the design and development of a unique high read-range high-efficiency (95%) radio frequency identification (RFID) antenna for the 915 MHz UHF band is discussed. The RFID exceptional characteristics are investigated in terms of antenna-IC matching and radiation efficiency. This 915 MHz passive tag is a 3\" times 3\" omnidirectional tag and yielded a read range of 31 feet compared to a 4\" times 4\" leading commercial design of 26 feet tested range in lab. This tag also possesses higher read power range (-7 dBm to 30 dBm) than the leading commercial design (-5 dBm to 30 dBm). The proposed RFID antenna was fabricated on 50.8 micron thick liquid crystal polymer (LCP) and the read range of the proposed RFID tags was experimentally verified","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"5 1","pages":"1031-1034"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84581116","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 : 2006-07-09DOI: 10.1109/APS.2006.1711302
J. T. Prothro, G. Durgin, J. Griffin
This paper presents measured antenna impedance and patterns of a horizontally oriented folded dipole as it is moved toward a metal ground plane. The 915 MHz measurements on different antennas provide rules-of-thumb for RFID link design and suggest that changing antenna thicknesses may make tags more resistant to on-object degradations
{"title":"The Effects of a Metal Ground Plane on RFID Tag Antennas","authors":"J. T. Prothro, G. Durgin, J. Griffin","doi":"10.1109/APS.2006.1711302","DOIUrl":"https://doi.org/10.1109/APS.2006.1711302","url":null,"abstract":"This paper presents measured antenna impedance and patterns of a horizontally oriented folded dipole as it is moved toward a metal ground plane. The 915 MHz measurements on different antennas provide rules-of-thumb for RFID link design and suggest that changing antenna thicknesses may make tags more resistant to on-object degradations","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"118 1","pages":"3241-3244"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84893962","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 : 2006-07-09DOI: 10.1109/APS.2006.1710849
Nasimuddin, K. Esselle, A. K. Verma
A systematic technique is developed to improve the AR bandwidth of circularly polarized stacked microstrip antennas (CPSMAs) to about 14% by optimizing the location of the feed and a few other parameters. A new C-type single feed is explored for this purposes. Then a CPSMA is integrated with a quasi-planar short horn to enhance its gain. Our results indicate that it is possible to increase the gain by 4.5 dB without compromising the 3 dB axial ratio (AR) bandwidth or the 10 dB return loss bandwidth of the CPSMA. The final design has a gain of 11.5 dBi, 3 dB AR bandwidth of 15.2%, minimum AR of 0.27 dB and a 10 dB return loss bandwidth of 21.5%. The proposed techniques simplify the design of wideband circularly polarized antennas for medium to high gain applications
{"title":"Improving the axial-ratio bandwidth of circularly polarized stacked microstrip antennas and enhancing their gain with short horns","authors":"Nasimuddin, K. Esselle, A. K. Verma","doi":"10.1109/APS.2006.1710849","DOIUrl":"https://doi.org/10.1109/APS.2006.1710849","url":null,"abstract":"A systematic technique is developed to improve the AR bandwidth of circularly polarized stacked microstrip antennas (CPSMAs) to about 14% by optimizing the location of the feed and a few other parameters. A new C-type single feed is explored for this purposes. Then a CPSMA is integrated with a quasi-planar short horn to enhance its gain. Our results indicate that it is possible to increase the gain by 4.5 dB without compromising the 3 dB axial ratio (AR) bandwidth or the 10 dB return loss bandwidth of the CPSMA. The final design has a gain of 11.5 dBi, 3 dB AR bandwidth of 15.2%, minimum AR of 0.27 dB and a 10 dB return loss bandwidth of 21.5%. The proposed techniques simplify the design of wideband circularly polarized antennas for medium to high gain applications","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":"44 1","pages":"1545-1548"},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84952588","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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