Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370135
Y. Ge, K. Esselle, T. Bird
Two wideband stacked rectangular dielectric resonator antenna (DRA) designs are presented. These DRAs are excited by a coaxial probe and small square metallic patch connected with a coaxial probe respectively. Simulated results show that over 80% matching bandwidth can be achieved by these designs
{"title":"Wideband Stacked Dielectric Resonator Antennas","authors":"Y. Ge, K. Esselle, T. Bird","doi":"10.1109/IWAT.2007.370135","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370135","url":null,"abstract":"Two wideband stacked rectangular dielectric resonator antenna (DRA) designs are presented. These DRAs are excited by a coaxial probe and small square metallic patch connected with a coaxial probe respectively. Simulated results show that over 80% matching bandwidth can be achieved by these designs","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131069815","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370073
J. Volakis, K. Sertel, H. Verweij
Engineered materials, such as new composites, electromagnetic bandgap, and periodic structures have attracted considerable interest in recent years due to their remarkable and unique electromagnetic properties. Among this class of media are the magnetic photonic and degenerate bandgap crystals. These periodic media have the concurrent characteristics of wave slow-down and impedance matching at their dielectric interface. The first allows for miniaturization, and the latter is equivalent to radiation efficiency. Overall these properties are a consequence of the anisotropic nature of the periodic media, allowing for internal phase shifting that leads to ray collimation for best aperture utilization. To a degree, they emulate zero index materials, and thus (planar) layers of the material serve the same purpose as a reflector dish. This important property of the MPA and DBE structures are discussed at the meeting. The main focus of this work is two-fold: 1. The realization (in terms of material availability and fabrication) of the proposed periodic media, and their theoretical and measured performance for antenna applications. Specifically, we will pursue feed arrangements, impedance matching and metallizations/printings for maximum aperture efficiency. 2. Introduction of a concept that allows for emulation of the anisotropic properties of MPA/DBE media using a novel coupled line printed approach. This concept allows for the realization of the wave slow-down and impedance matching within a printed microwave structure, leading to new design methodologies for microwave components, including couplers, filters and printed antenna devices.
{"title":"Periodic Materials and Printed Structures for Miniature Antennas","authors":"J. Volakis, K. Sertel, H. Verweij","doi":"10.1109/IWAT.2007.370073","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370073","url":null,"abstract":"Engineered materials, such as new composites, electromagnetic bandgap, and periodic structures have attracted considerable interest in recent years due to their remarkable and unique electromagnetic properties. Among this class of media are the magnetic photonic and degenerate bandgap crystals. These periodic media have the concurrent characteristics of wave slow-down and impedance matching at their dielectric interface. The first allows for miniaturization, and the latter is equivalent to radiation efficiency. Overall these properties are a consequence of the anisotropic nature of the periodic media, allowing for internal phase shifting that leads to ray collimation for best aperture utilization. To a degree, they emulate zero index materials, and thus (planar) layers of the material serve the same purpose as a reflector dish. This important property of the MPA and DBE structures are discussed at the meeting. The main focus of this work is two-fold: 1. The realization (in terms of material availability and fabrication) of the proposed periodic media, and their theoretical and measured performance for antenna applications. Specifically, we will pursue feed arrangements, impedance matching and metallizations/printings for maximum aperture efficiency. 2. Introduction of a concept that allows for emulation of the anisotropic properties of MPA/DBE media using a novel coupled line printed approach. This concept allows for the realization of the wave slow-down and impedance matching within a printed microwave structure, leading to new design methodologies for microwave components, including couplers, filters and printed antenna devices.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127401031","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370082
W. Hong, Bing Liu, G. Luo, Q. Lai, J.F. Xu, Z. Hao, F. He, X.X. Yin
In this paper, the research advances in integrated microwave and millimeter wave antennas based the substrate integrated waveguide (SIW) and half-mode substrate integrated waveguide (HMSIW) technology are reviewed, including the SIW/HMSIW slot array antennas, leakage wave antennas, omnidirectional antennas, monopulse antennas, filtennas, dielectric resonator antennas and rectennas etc. The achievements summarized here are mainly limited to the recent work of the authors
{"title":"Integrated Microwave and Millimeter Wave Antennas Based on SIW and HMSIW Technology","authors":"W. Hong, Bing Liu, G. Luo, Q. Lai, J.F. Xu, Z. Hao, F. He, X.X. Yin","doi":"10.1109/IWAT.2007.370082","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370082","url":null,"abstract":"In this paper, the research advances in integrated microwave and millimeter wave antennas based the substrate integrated waveguide (SIW) and half-mode substrate integrated waveguide (HMSIW) technology are reviewed, including the SIW/HMSIW slot array antennas, leakage wave antennas, omnidirectional antennas, monopulse antennas, filtennas, dielectric resonator antennas and rectennas etc. The achievements summarized here are mainly limited to the recent work of the authors","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127026265","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370068
K. Fujimoto
In this paper, small antennas (SA) are treated with a wide concept, in which not only electrically small antennas (ESA), but also SA's categorized in terms of dimensions and functions are included. Essentials of SA are discussed pertaining to the fundamentals of SA and realization of SA. Matching and resonance are taken as the significant issues in SA. Investigation of the radiation mechanism of an antenna system and study of the calculation of energy flow from an antenna are proposed as one of the clues to look into the essentials of SA. Typical structures to create ESA are shown and some practical examples of SA are introduced. Future perspectives are briefly discussed.
{"title":"Modern Small Antenna Engieering","authors":"K. Fujimoto","doi":"10.1109/IWAT.2007.370068","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370068","url":null,"abstract":"In this paper, small antennas (SA) are treated with a wide concept, in which not only electrically small antennas (ESA), but also SA's categorized in terms of dimensions and functions are included. Essentials of SA are discussed pertaining to the fundamentals of SA and realization of SA. Matching and resonance are taken as the significant issues in SA. Investigation of the radiation mechanism of an antenna system and study of the calculation of energy flow from an antenna are proposed as one of the clues to look into the essentials of SA. Typical structures to create ESA are shown and some practical examples of SA are introduced. Future perspectives are briefly discussed.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128663150","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370179
S. K. Parui, S. Das
A selective bandpass filter is presented by using a pairs of open loop resonators, each has a perimeter about half-wavelength. For the improvement of bandwidth, we have used a DGS under coupled area. A prototype filter circuit of center frequency at 1.8 GHz has been fabricated with PTFE substrate. Measured result shows bandwidth of 200 MHz with insertion loss of 0.2 dB at center frequency of 1.95 GHz. We have used defected ground structures under feed lines for extra stopband rejection mode to the 2nd and 3rd harmonics of the filter with attenuation losses over than -25 dB, without affecting the center frequency and insertion loss of the originally designed filter.
{"title":"Performance Enhancement of Microstrip Open Loop Resonator Band Pass Filter By Defected Ground structures","authors":"S. K. Parui, S. Das","doi":"10.1109/IWAT.2007.370179","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370179","url":null,"abstract":"A selective bandpass filter is presented by using a pairs of open loop resonators, each has a perimeter about half-wavelength. For the improvement of bandwidth, we have used a DGS under coupled area. A prototype filter circuit of center frequency at 1.8 GHz has been fabricated with PTFE substrate. Measured result shows bandwidth of 200 MHz with insertion loss of 0.2 dB at center frequency of 1.95 GHz. We have used defected ground structures under feed lines for extra stopband rejection mode to the 2nd and 3rd harmonics of the filter with attenuation losses over than -25 dB, without affecting the center frequency and insertion loss of the originally designed filter.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116021139","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370085
A. Thornell-Pers, P. Erlandsson
A small active controllable cellular antenna for mobile phones has been designed and evaluated. With a switch on top of the radiator different frequency bands can be chosen. The antenna is based on a dual band IFA design but number of bands are increased to four. Two different radiator branches can be activated by the switch which results in a frequency shift. In one state the antenna covers the GSM 850 MHz and 1800 MHz bands and in the other state the GSM 900 MHz and 1900 MHz bands are covered. This means the antenna size is same as a dual band antenna but it covers four frequency bands. Size is 38times7times1 mm. Adding active circuits to an antenna to achieve frequency control normally results in high losses and low gain antenna. With this solution the performance remains and radiation efficiency (gain) is very high and similar to a passive antenna
{"title":"Compact Active Multiband Cellular Antenna for Mobile Handsets","authors":"A. Thornell-Pers, P. Erlandsson","doi":"10.1109/IWAT.2007.370085","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370085","url":null,"abstract":"A small active controllable cellular antenna for mobile phones has been designed and evaluated. With a switch on top of the radiator different frequency bands can be chosen. The antenna is based on a dual band IFA design but number of bands are increased to four. Two different radiator branches can be activated by the switch which results in a frequency shift. In one state the antenna covers the GSM 850 MHz and 1800 MHz bands and in the other state the GSM 900 MHz and 1900 MHz bands are covered. This means the antenna size is same as a dual band antenna but it covers four frequency bands. Size is 38times7times1 mm. Adding active circuits to an antenna to achieve frequency control normally results in high losses and low gain antenna. With this solution the performance remains and radiation efficiency (gain) is very high and similar to a passive antenna","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116745088","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370159
K. Karlsson, J. Carlsson, P. Ankarson, Z. Ying
This paper presents a simple method for using data from full wave simulations in combination with lumped circuit models for calculating port responses for arbitrary loading and excitation conditions. Data from full wave simulations are used for constructing a matrix representation of port responses that is used in a circuit simulator code where arbitrary active and passive components can be added to the circuit. By this it is possible to evaluate different circuit configurations efficiently without the need of performing additional full wave simulations.
{"title":"Combination of Full Wave Simulations and Equivalent Circuit Models in Predicting Coupling between Antenna Element and Nearby Object in Mobile Phone","authors":"K. Karlsson, J. Carlsson, P. Ankarson, Z. Ying","doi":"10.1109/IWAT.2007.370159","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370159","url":null,"abstract":"This paper presents a simple method for using data from full wave simulations in combination with lumped circuit models for calculating port responses for arbitrary loading and excitation conditions. Data from full wave simulations are used for constructing a matrix representation of port responses that is used in a circuit simulator code where arbitrary active and passive components can be added to the circuit. By this it is possible to evaluate different circuit configurations efficiently without the need of performing additional full wave simulations.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114398895","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370156
J. Wu, S. Khamas, G. Cook
A conformal Archimedian spiral antenna above a cylindrical groundplane is modelled using a curved segment moment method incorporating closed form Green's functions to describe the cylinder for maximum computational efficiency. Asymptotic input impedances agree well with a planar geometry.
{"title":"Conformal Archimedian Spiral Antenna Above a Cylindrical Groundplane","authors":"J. Wu, S. Khamas, G. Cook","doi":"10.1109/IWAT.2007.370156","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370156","url":null,"abstract":"A conformal Archimedian spiral antenna above a cylindrical groundplane is modelled using a curved segment moment method incorporating closed form Green's functions to describe the cylinder for maximum computational efficiency. Asymptotic input impedances agree well with a planar geometry.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114485913","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370127
S. Zhong, Li‐Na Zhang, Xianling Liang
The rapid development in the WLAN communication demands novel compact antenna designs that can provide multi-band operation, such as the IEEE 802.11b/g (2.4-2.484 GHz), IEEE802.11a (5.15-5.35 GHz, 5.725-5.825 GHz), and HIPERLAN/2 (5.15-5.35 GHz, 5.47-5.725 GHz) operations. This article introduces a printed meander monopole antenna with a novel shaped profile for tri-band WLAN operation. Compared with the above mentioned monopole antennas of letter configurations, the proposed antenna has a smaller size and a wider bandwidth. Details of the antenna design and the experimental results are presented and discussed
{"title":"Compact Tri-Band Printed Monopole Antenna","authors":"S. Zhong, Li‐Na Zhang, Xianling Liang","doi":"10.1109/IWAT.2007.370127","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370127","url":null,"abstract":"The rapid development in the WLAN communication demands novel compact antenna designs that can provide multi-band operation, such as the IEEE 802.11b/g (2.4-2.484 GHz), IEEE802.11a (5.15-5.35 GHz, 5.725-5.825 GHz), and HIPERLAN/2 (5.15-5.35 GHz, 5.47-5.725 GHz) operations. This article introduces a printed meander monopole antenna with a novel shaped profile for tri-band WLAN operation. Compared with the above mentioned monopole antennas of letter configurations, the proposed antenna has a smaller size and a wider bandwidth. Details of the antenna design and the experimental results are presented and discussed","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114520254","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370182
M. Neshat, D. Saeedkia, S. Safavi-Naeini
In this paper, large-aperture terahertz photoconductive antennas, placed on a hyper-hemispherical silicon lens and excited by a short, pulse laser, are studied. The behavior of the radiation field is investigated in terms of several aspects. Our study shows that the radiated field is saturated when the photo-conductivity exceeds a threshold value defined be the permittivity of the photoconductor material.
{"title":"On the Behavior of the Radiation Field from Large-Aperture Terahertz Photoconductive Antenna under Impulsive Excitation","authors":"M. Neshat, D. Saeedkia, S. Safavi-Naeini","doi":"10.1109/IWAT.2007.370182","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370182","url":null,"abstract":"In this paper, large-aperture terahertz photoconductive antennas, placed on a hyper-hemispherical silicon lens and excited by a short, pulse laser, are studied. The behavior of the radiation field is investigated in terms of several aspects. Our study shows that the radiated field is saturated when the photo-conductivity exceeds a threshold value defined be the permittivity of the photoconductor material.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126760309","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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