Pub Date : 2012-10-08DOI: 10.1109/APWC.2012.6324916
M. Guo, S. Zhong, X. Xuan
A cavity backed double-sided printed dipole antenna is presented, which provides broadband performance with compact antenna size. Along with the detail simulated results, the measured results of the fabricated prototype antenna are presented, showing the impedance bandwidth (VSWR ≤ 2) of 14.4%, from 1.68GHz to 1.94GHz. Its radiation characteristics are also measured, exhibiting a stable broadside radiation pattern over a wider bandwidth. The proposed antenna has wide potential applications in conformal phased arrays.
{"title":"Conformal double printed dipole antenna","authors":"M. Guo, S. Zhong, X. Xuan","doi":"10.1109/APWC.2012.6324916","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324916","url":null,"abstract":"A cavity backed double-sided printed dipole antenna is presented, which provides broadband performance with compact antenna size. Along with the detail simulated results, the measured results of the fabricated prototype antenna are presented, showing the impedance bandwidth (VSWR ≤ 2) of 14.4%, from 1.68GHz to 1.94GHz. Its radiation characteristics are also measured, exhibiting a stable broadside radiation pattern over a wider bandwidth. The proposed antenna has wide potential applications in conformal phased arrays.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75521076","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324972
A. Amiri, K. Tong, K. Chetty
Multi-frequency Ground Penetrating Radar (GPR) has become increasingly popular choice of system design in order to enhance the ability to operate in diverse environmental conditions as well as different scanning methods and target characterisation. The main component of a GPR system is comprised of an antenna design and the recent interests in multi frequency radar systems have coincided with the development of frequency reconfigurable antennas which can provide suitable performance. In this work, a new reconfigurable patch antenna is investigated, that is able to switch between different radar operating frequencies using modelled RF MEMS switches. Different combinations of the switches allow the design to alter the length and shape of the radiating element. The initial design of the antenna consists of a circular patch surrounded by multiple annual rings that can be connected together according to the switches activation configuration. Experimental work and modifications to the initial design are in progress and the results will be presented in the ICEAA-IEEE APWC conference.
{"title":"Reconfigurable multiband patch antenna for Ground Penetrating Radar applications","authors":"A. Amiri, K. Tong, K. Chetty","doi":"10.1109/APWC.2012.6324972","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324972","url":null,"abstract":"Multi-frequency Ground Penetrating Radar (GPR) has become increasingly popular choice of system design in order to enhance the ability to operate in diverse environmental conditions as well as different scanning methods and target characterisation. The main component of a GPR system is comprised of an antenna design and the recent interests in multi frequency radar systems have coincided with the development of frequency reconfigurable antennas which can provide suitable performance. In this work, a new reconfigurable patch antenna is investigated, that is able to switch between different radar operating frequencies using modelled RF MEMS switches. Different combinations of the switches allow the design to alter the length and shape of the radiating element. The initial design of the antenna consists of a circular patch surrounded by multiple annual rings that can be connected together according to the switches activation configuration. Experimental work and modifications to the initial design are in progress and the results will be presented in the ICEAA-IEEE APWC conference.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79638972","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324931
O. Jacobs
The conductivity of a number of mechanical surface finishes are compared to determine if they are suitable for low loss components such as horn antennas and waveguides that are to be used in radio astronomy.
{"title":"Comparison of the surface resistance of conductive sheets with different surface finishes","authors":"O. Jacobs","doi":"10.1109/APWC.2012.6324931","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324931","url":null,"abstract":"The conductivity of a number of mechanical surface finishes are compared to determine if they are suitable for low loss components such as horn antennas and waveguides that are to be used in radio astronomy.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85118292","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324984
D. Baker, J. B. du Toit
This paper discusses the development of a compact light-weight planar spiral antenna for use in amplitude comparison and interferometer direction finding (DF) applications covering 1 to 18 GHz. The antenna uses a slow-wave (zigzag) spiral radiator which results in a cavity diameter which is only 68% of the wavelength at 1 GHz. The two-arm spiral is fed by a Marchand balun and achieves a VSWR of less than 1.5:1 over almost the entire 1 to 18 GHz frequency range. The spiral antennas are supplied in phase and amplitude tracking sets for wideband DF applications. Amplitude and phase tracking performance for a fully integrated linear interferometer DF panel which includes the radome and feed cable effects are presented. Phase DF performance for the panel with pulse receivers as measured in an anechoic chamber is discussed.
{"title":"A compact 1 to 18 GHz planar spiral antenna for interferometer and other direction finding applications","authors":"D. Baker, J. B. du Toit","doi":"10.1109/APWC.2012.6324984","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324984","url":null,"abstract":"This paper discusses the development of a compact light-weight planar spiral antenna for use in amplitude comparison and interferometer direction finding (DF) applications covering 1 to 18 GHz. The antenna uses a slow-wave (zigzag) spiral radiator which results in a cavity diameter which is only 68% of the wavelength at 1 GHz. The two-arm spiral is fed by a Marchand balun and achieves a VSWR of less than 1.5:1 over almost the entire 1 to 18 GHz frequency range. The spiral antennas are supplied in phase and amplitude tracking sets for wideband DF applications. Amplitude and phase tracking performance for a fully integrated linear interferometer DF panel which includes the radome and feed cable effects are presented. Phase DF performance for the panel with pulse receivers as measured in an anechoic chamber is discussed.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80372352","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324908
S. Zhong, L. Kong
A dual-polarized quasi-cubic dielectric resonator antenna (DRA) with a simple multi-stub feeding network is introduced for the array applications. The measured impedance bandwidths of dual ports are 18.5% and 20% , and the measured isolation is better than 45dB over an 11.7% bandwidth. This DRA can be expanded into large arrays for the synthetic aperture radar (SAR) and wireless systems.
{"title":"Design of high isolation dual-polarized dielectric resonator antenna","authors":"S. Zhong, L. Kong","doi":"10.1109/APWC.2012.6324908","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324908","url":null,"abstract":"A dual-polarized quasi-cubic dielectric resonator antenna (DRA) with a simple multi-stub feeding network is introduced for the array applications. The measured impedance bandwidths of dual ports are 18.5% and 20% , and the measured isolation is better than 45dB over an 11.7% bandwidth. This DRA can be expanded into large arrays for the synthetic aperture radar (SAR) and wireless systems.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83236045","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324956
M. Ando, Pengfei Lu, T. Kohama
This paper reviews the significance of equivalent edge currents for surface-to-line integral reduction in EM scattering and the relations between various high frequency methods are surveyed in this context. It suggests that most of the difficulties in GTD comes from errors in reduction of surface currents into equivalent currents and further into rays. Two unique concepts introduced by the authors are demonstrated; MER as the novel definition of equivalent edge currents is developed for accurate and uniform reduction of radiation integrals.
{"title":"Discussion of physical optics surface integration for deep interpretation of GTD","authors":"M. Ando, Pengfei Lu, T. Kohama","doi":"10.1109/APWC.2012.6324956","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324956","url":null,"abstract":"This paper reviews the significance of equivalent edge currents for surface-to-line integral reduction in EM scattering and the relations between various high frequency methods are surveyed in this context. It suggests that most of the difficulties in GTD comes from errors in reduction of surface currents into equivalent currents and further into rays. Two unique concepts introduced by the authors are demonstrated; MER as the novel definition of equivalent edge currents is developed for accurate and uniform reduction of radiation integrals.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81347194","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324933
N. Neumann, R. Trieb, W. Benedix, D. Plettemeier
Photonic beam forming networks benefit from the broad bandwidth and low attenuation of optical waveguides. Applying the true time delay (TTD) approach for antenna arrays, the feeding network is independent from the electrical carrier frequency of the signal. Consequently, the performance of this approach is maximized by placing the opto-electrical conversion (photodiode) directly at the feeding point of the antenna. In this work, such a setup that combines the optical TTD technique and photonic feeding is demonstrated with a four element array of Vivaldi antennas working in the broad frequency range from 0.5-2.5 GHz. A photonic feeding network supporting the beamforming of different antenna patterns is designed. Measurements are presented and discussed.
{"title":"Active integrated photonic antenna array","authors":"N. Neumann, R. Trieb, W. Benedix, D. Plettemeier","doi":"10.1109/APWC.2012.6324933","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324933","url":null,"abstract":"Photonic beam forming networks benefit from the broad bandwidth and low attenuation of optical waveguides. Applying the true time delay (TTD) approach for antenna arrays, the feeding network is independent from the electrical carrier frequency of the signal. Consequently, the performance of this approach is maximized by placing the opto-electrical conversion (photodiode) directly at the feeding point of the antenna. In this work, such a setup that combines the optical TTD technique and photonic feeding is demonstrated with a four element array of Vivaldi antennas working in the broad frequency range from 0.5-2.5 GHz. A photonic feeding network supporting the beamforming of different antenna patterns is designed. Measurements are presented and discussed.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83442543","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324910
Chi-Fang Huang, Yu-Wei Tien, Chang-Lan Tsai
This paper presents design of sets of wideband antenna for being installed on the train car of Taiwan High Speed Rail (THSR). As terminal antennas, these antennas function wireless communication with the Base Stations (BS) of WiMAX along the rail when the train is running. Also, they work in a wideband and in a way of spatial diversity to ensure stable data transmission. One set is based on microstrip antenna technology and the other one is of monopole-like antenna. In addition to the simulated and measured performance of antennas, the field test data is also described.
{"title":"Design of antennas with spatial diversity for WiMAX terminals on a high-speed train","authors":"Chi-Fang Huang, Yu-Wei Tien, Chang-Lan Tsai","doi":"10.1109/APWC.2012.6324910","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324910","url":null,"abstract":"This paper presents design of sets of wideband antenna for being installed on the train car of Taiwan High Speed Rail (THSR). As terminal antennas, these antennas function wireless communication with the Base Stations (BS) of WiMAX along the rail when the train is running. Also, they work in a wideband and in a way of spatial diversity to ensure stable data transmission. One set is based on microstrip antenna technology and the other one is of monopole-like antenna. In addition to the simulated and measured performance of antennas, the field test data is also described.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79192768","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324913
N. Guan, R. Hosono, K. Yashiro
In this paper, an ultra-wide band (UWB) antenna with multiple band rejections is proposed. The antenna consists of a radiation element that supports radiation in a range from 3.1 to 15 GHz and a ground plane. The antenna is fed by a microstrip line embedded on the back of the ground plane. The microstrip line is designed to have nonuniform width along longitudinal direction by using the inverse scattering theory so as it has band rejections at 5 to 6 GHz and 10.6 to 13 GHz. A fabricated antenna shows that the measurement agrees with the theory very well. The antenna radiates properly in the UWB range except the WLAN range from 5 to 6 GHz and the radiation outside the UWB range is successfully suppressed.
{"title":"UWB antenna with multiple controlled rejection-bands","authors":"N. Guan, R. Hosono, K. Yashiro","doi":"10.1109/APWC.2012.6324913","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324913","url":null,"abstract":"In this paper, an ultra-wide band (UWB) antenna with multiple band rejections is proposed. The antenna consists of a radiation element that supports radiation in a range from 3.1 to 15 GHz and a ground plane. The antenna is fed by a microstrip line embedded on the back of the ground plane. The microstrip line is designed to have nonuniform width along longitudinal direction by using the inverse scattering theory so as it has band rejections at 5 to 6 GHz and 10.6 to 13 GHz. A fabricated antenna shows that the measurement agrees with the theory very well. The antenna radiates properly in the UWB range except the WLAN range from 5 to 6 GHz and the radiation outside the UWB range is successfully suppressed.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80872324","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324969
B. Heydari, A. Islamdoost
The necessity to use a great bandwidth in communication industries led to a change of the shape of the monopole antennas and use of a flat rather than a bar as radiator. This type of antenna was proposed for the first time in 1958 by Mr. B.J. Lamberty in the form of a rectangular plate. from then on, other similar antennas were presented in the shape of circular, elliptical, and trapezoidal discs which meant to increase the bandwidth. That, in turn, led to better radiation pattern which ended in the improvement of the design. Having this in mind, we leave tried in this article to present a new shape of broadband monopole antennas with proper bandwidth and radiation pattern as following.
{"title":"A new broadband trapezoidal flat monopole antenna","authors":"B. Heydari, A. Islamdoost","doi":"10.1109/APWC.2012.6324969","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324969","url":null,"abstract":"The necessity to use a great bandwidth in communication industries led to a change of the shape of the monopole antennas and use of a flat rather than a bar as radiator. This type of antenna was proposed for the first time in 1958 by Mr. B.J. Lamberty in the form of a rectangular plate. from then on, other similar antennas were presented in the shape of circular, elliptical, and trapezoidal discs which meant to increase the bandwidth. That, in turn, led to better radiation pattern which ended in the improvement of the design. Having this in mind, we leave tried in this article to present a new shape of broadband monopole antennas with proper bandwidth and radiation pattern as following.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88778903","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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