Pub Date : 2016-10-25DOI: 10.1109/APS.2016.7696414
P. Qin, Y. Guo, Lu-Yang Ji, F. Wei
A single-layer wideband reflectarray antenna employing sub-wavelength phase-shifting elements is presented. The element is composed of double concentric square meander line rings and its size is a fifth of a wavelength. By changing the length of the meander line, a phase variation range of about 360° is achieved with an almost constant slop across the 9 to 11 GHz. Using this element, a 48 × 48 - element reflectarray antenna is designed. A measured 1.5-dB gain bandwidth of 18 % is achieved.
{"title":"A single-layer wideband reflectarray with sub-wavelength phase-shifting elements","authors":"P. Qin, Y. Guo, Lu-Yang Ji, F. Wei","doi":"10.1109/APS.2016.7696414","DOIUrl":"https://doi.org/10.1109/APS.2016.7696414","url":null,"abstract":"A single-layer wideband reflectarray antenna employing sub-wavelength phase-shifting elements is presented. The element is composed of double concentric square meander line rings and its size is a fifth of a wavelength. By changing the length of the meander line, a phase variation range of about 360° is achieved with an almost constant slop across the 9 to 11 GHz. Using this element, a 48 × 48 - element reflectarray antenna is designed. A measured 1.5-dB gain bandwidth of 18 % is achieved.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"47 1","pages":"1415-1416"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79357730","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 : 2016-10-25DOI: 10.1109/APS.2016.7695710
H. Arai, Kanata Takahashi
This paper presents a two-notch antenna cut on a small ground plane excited out of phase to a radiate horizontally polarized omnidirectional pattern. The radiating modes of this antenna is evaluated by characteristic modes analysis to obtain omni-pattern. The second mode provides a loop current in horizontal plane, radiating omni-pattern with small ripples. To improve the uniformity of pattern, this paper also proposes an array with twisted elements in vertical axis.
{"title":"Design of horizontally polarized omni-directional antenna by characteristic modes analysis","authors":"H. Arai, Kanata Takahashi","doi":"10.1109/APS.2016.7695710","DOIUrl":"https://doi.org/10.1109/APS.2016.7695710","url":null,"abstract":"This paper presents a two-notch antenna cut on a small ground plane excited out of phase to a radiate horizontally polarized omnidirectional pattern. The radiating modes of this antenna is evaluated by characteristic modes analysis to obtain omni-pattern. The second mode provides a loop current in horizontal plane, radiating omni-pattern with small ripples. To improve the uniformity of pattern, this paper also proposes an array with twisted elements in vertical axis.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"8 1","pages":"3-4"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79723844","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 : 2016-10-25DOI: 10.1109/APS.2016.7696401
Vijayaraghavan Panda, Sung-Min Sohn, J. Vaughan, A. Gopinath
A Zeroth Order microstrip resonator (ZOR) is proposed as an element for a MRI transmission line RF coil. This paper discusses a design of the ZOR for the RF coil for a 7T MRI system. A balanced metamaterial line is used to achieve broadside radiation. The design has the advantage of generating uniform strong near field up to a vicinity of 3 cm from its surface, and requires minimal tuning and matching when loaded with a phantom. The design can be made for any physical length as it is designed to have its propagation parameter set to zero.
{"title":"A Zeroth Order resonant element for MRI transmisson line RF coil","authors":"Vijayaraghavan Panda, Sung-Min Sohn, J. Vaughan, A. Gopinath","doi":"10.1109/APS.2016.7696401","DOIUrl":"https://doi.org/10.1109/APS.2016.7696401","url":null,"abstract":"A Zeroth Order microstrip resonator (ZOR) is proposed as an element for a MRI transmission line RF coil. This paper discusses a design of the ZOR for the RF coil for a 7T MRI system. A balanced metamaterial line is used to achieve broadside radiation. The design has the advantage of generating uniform strong near field up to a vicinity of 3 cm from its surface, and requires minimal tuning and matching when loaded with a phantom. The design can be made for any physical length as it is designed to have its propagation parameter set to zero.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"45 1","pages":"1389-1390"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74010726","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 : 2016-10-25DOI: 10.1109/APS.2016.7696097
Rabia Yahya, A. Nakamura, M. Itami
In this paper, we propose the design of a new reconfigurable frequency selective surface (FSS) for ultrawideband (UWB) applications. The proposed FSS is constituted of a periodic array of two layers, of crossed metallic tapered dipoles, separated by a single-layer FSS and related by a twin wire transmission lines. With the proposed configuration, two propagating paths are formed. One path through the transmission lines and the second path allows the propagation through the interlayer FSS. Therefore, a corresponding bandpass can be obtained when the incident waves pass through the connecting transmission lines and a corresponding band-stop is achieved when the incident waves incoming on the interlayer which is band-stop UWB FSS. By inserting switches between the crossed tapered dipoles and the transmission lines, the obtained response can be controlled. Hence, reconfigurable UWB bandpass/stop can be achieved. Providing, an optimized candidate for UWB communications and radar systems.
{"title":"Reconfigurable ultra-wideband frequency selective surface","authors":"Rabia Yahya, A. Nakamura, M. Itami","doi":"10.1109/APS.2016.7696097","DOIUrl":"https://doi.org/10.1109/APS.2016.7696097","url":null,"abstract":"In this paper, we propose the design of a new reconfigurable frequency selective surface (FSS) for ultrawideband (UWB) applications. The proposed FSS is constituted of a periodic array of two layers, of crossed metallic tapered dipoles, separated by a single-layer FSS and related by a twin wire transmission lines. With the proposed configuration, two propagating paths are formed. One path through the transmission lines and the second path allows the propagation through the interlayer FSS. Therefore, a corresponding bandpass can be obtained when the incident waves pass through the connecting transmission lines and a corresponding band-stop is achieved when the incident waves incoming on the interlayer which is band-stop UWB FSS. By inserting switches between the crossed tapered dipoles and the transmission lines, the obtained response can be controlled. Hence, reconfigurable UWB bandpass/stop can be achieved. Providing, an optimized candidate for UWB communications and radar systems.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"1 1","pages":"777-778"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90491356","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 : 2016-10-25DOI: 10.1109/APS.2016.7696434
D. Chizhik, R. Valenzuela, Mauricio Rodríguez, R. Feick
Theory of normal mode propagation in a LOS street scenario is extended to include propagation into buildings through coupling to a diffuse indoor field. Resulting signal strength predictions show close agreement with measurements, 4.2 dB rms errors in an outdoor-indoor scenario. The model allows prediction of actual signal directions, important for evaluating performance of directional antennas.
在一个LOS街道场景的正常模式传播理论被扩展到包括传播到建筑物通过耦合到漫射室内场。由此得出的信号强度预测结果与测量结果非常吻合，在室外室内场景中误差为4.2 dB rms。该模型可以预测实际信号方向，这对评估定向天线的性能很重要。
{"title":"Propagation into buildings: Theory vs. measurements","authors":"D. Chizhik, R. Valenzuela, Mauricio Rodríguez, R. Feick","doi":"10.1109/APS.2016.7696434","DOIUrl":"https://doi.org/10.1109/APS.2016.7696434","url":null,"abstract":"Theory of normal mode propagation in a LOS street scenario is extended to include propagation into buildings through coupling to a diffuse indoor field. Resulting signal strength predictions show close agreement with measurements, 4.2 dB rms errors in an outdoor-indoor scenario. The model allows prediction of actual signal directions, important for evaluating performance of directional antennas.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"97 1","pages":"1455-1456"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80869353","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 : 2016-10-25DOI: 10.1109/APS.2016.7696142
R. Ziolkowski
After a brief historical perspective on the origins and developments of space-time coupled solutions of the wave equation, the so-called localized waves (LWs), my presentation will emphasize how they can be and have been launched from independently addressable pulse driven (IAPD) arrays. These IAPD arrays are characterized by each element having the possibility to be driven with an individualized time domain waveform. Several acoustic and electromagnetic LW solutions, the IAPD arrays than can launch them, and the near-field and extended far-field region behaviors characterizing the localized beams launched by them, as well as the experiments that have verified these effects, will be discussed.
{"title":"Generating localized waves from independently addressable pulse driven arrays","authors":"R. Ziolkowski","doi":"10.1109/APS.2016.7696142","DOIUrl":"https://doi.org/10.1109/APS.2016.7696142","url":null,"abstract":"After a brief historical perspective on the origins and developments of space-time coupled solutions of the wave equation, the so-called localized waves (LWs), my presentation will emphasize how they can be and have been launched from independently addressable pulse driven (IAPD) arrays. These IAPD arrays are characterized by each element having the possibility to be driven with an individualized time domain waveform. Several acoustic and electromagnetic LW solutions, the IAPD arrays than can launch them, and the near-field and extended far-field region behaviors characterizing the localized beams launched by them, as well as the experiments that have verified these effects, will be discussed.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"216 1","pages":"867-868"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75759592","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 : 2016-10-25DOI: 10.1109/APS.2016.7696182
Pallavi Sharma, J. Bernhard
Thin form factor and placement-insensitivity are essential qualities of planar RFID antennas. Placement insensitivity can be achieved by introducing a conducting back plane. As the antennas become thinner, most of the energy is stored in the form of parallel plate modes resulting in the reduction of the bandwidth. Edge treatment in the form of serrations can be used to improve the bandwidth of such antennas. Researchers have investigated the use of serrations in resonant length antennas for bandwidth improvement. However, the behavior of serrations in non-resonant length antennas has not been studied in detail. This paper examines the changes in characteristic modes of non-resonant length antenna due to the change in the dimensions of serrations and proximity to the back plane. Statistical analysis is performed to ascertain the effect of antenna thickness, serration depth and serration width on the characteristic modes of the antenna.
{"title":"Statistical analysis of the effect of ground plane serrations on thin planar RFID antennas","authors":"Pallavi Sharma, J. Bernhard","doi":"10.1109/APS.2016.7696182","DOIUrl":"https://doi.org/10.1109/APS.2016.7696182","url":null,"abstract":"Thin form factor and placement-insensitivity are essential qualities of planar RFID antennas. Placement insensitivity can be achieved by introducing a conducting back plane. As the antennas become thinner, most of the energy is stored in the form of parallel plate modes resulting in the reduction of the bandwidth. Edge treatment in the form of serrations can be used to improve the bandwidth of such antennas. Researchers have investigated the use of serrations in resonant length antennas for bandwidth improvement. However, the behavior of serrations in non-resonant length antennas has not been studied in detail. This paper examines the changes in characteristic modes of non-resonant length antenna due to the change in the dimensions of serrations and proximity to the back plane. Statistical analysis is performed to ascertain the effect of antenna thickness, serration depth and serration width on the characteristic modes of the antenna.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"38 1","pages":"947-948"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75064270","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 : 2016-10-25DOI: 10.1109/APS.2016.7695778
L. Feng, Yuxiang Sun, K. Leung
An omnidirectional cylindrical ring DRA is investigated for 5.8-GHz WLAN applications. It is excited in its higher-order TM015 mode to enhance the antenna gain. For demonstration, a prototype was designed and fabricated. The reflection coefficient, antenna gain, antenna efficiency, and radiation pattern are studied, and reasonable agreement between the measurement and simulation is found.
{"title":"Gain enhanced omnidirectional cylindrical ring dielectric resonator antenna","authors":"L. Feng, Yuxiang Sun, K. Leung","doi":"10.1109/APS.2016.7695778","DOIUrl":"https://doi.org/10.1109/APS.2016.7695778","url":null,"abstract":"An omnidirectional cylindrical ring DRA is investigated for 5.8-GHz WLAN applications. It is excited in its higher-order TM015 mode to enhance the antenna gain. For demonstration, a prototype was designed and fabricated. The reflection coefficient, antenna gain, antenna efficiency, and radiation pattern are studied, and reasonable agreement between the measurement and simulation is found.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"72 1","pages":"139-140"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84019142","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 : 2016-10-25DOI: 10.1109/APS.2016.7696246
W. C. Chew, W. Weedon, F.-C. Chen, J. Zhao, J. Bowen
We review the influence of Paul E. Mayes on broadband antennas and its applications, especially on super-resolution microwave imaging and inverse scattering.
本文综述了Paul E. Mayes对宽带天线及其应用的影响，特别是对超分辨微波成像和逆散射的影响。
{"title":"Broadband antennas and super-resolution imaging: Influence of Paul E. Mayes","authors":"W. C. Chew, W. Weedon, F.-C. Chen, J. Zhao, J. Bowen","doi":"10.1109/APS.2016.7696246","DOIUrl":"https://doi.org/10.1109/APS.2016.7696246","url":null,"abstract":"We review the influence of Paul E. Mayes on broadband antennas and its applications, especially on super-resolution microwave imaging and inverse scattering.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"73 1","pages":"1077-1078"},"PeriodicalIF":0.0,"publicationDate":"2016-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76492480","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 : 2016-10-01DOI: 10.1109/ARRAY.2016.7832642
T. Mannion, A. Duwel, A. Akyurtlu, Brian Smith, John E. Grandfield
In this paper, an alternative approach to beam steering is presented through the use of a novel quadrifilar helix antenna, with a monopole in its center to get a low form factor and high performance. By altering the phase and amplitude of the monopole, the beam can be `steered' 360 degrees in the phi direction, and 90 degrees in the theta direction. Simulated test data showing antenna performance will be compared to current beam steering methodologies.
{"title":"Beam steering a quadrifilar helix antenna at S-band using a monopole","authors":"T. Mannion, A. Duwel, A. Akyurtlu, Brian Smith, John E. Grandfield","doi":"10.1109/ARRAY.2016.7832642","DOIUrl":"https://doi.org/10.1109/ARRAY.2016.7832642","url":null,"abstract":"In this paper, an alternative approach to beam steering is presented through the use of a novel quadrifilar helix antenna, with a monopole in its center to get a low form factor and high performance. By altering the phase and amplitude of the monopole, the beam can be `steered' 360 degrees in the phi direction, and 90 degrees in the theta direction. Simulated test data showing antenna performance will be compared to current beam steering methodologies.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"48 1","pages":"659-660"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76342791","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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