Pub Date : 2015-03-04DOI: 10.1109/IWAT.2015.7365325
Wen‐Hua Tu
A design method for coplanar waveguide-fed capacitively coupled slot antenna is presented. An equivalent model of a coupling capacitor and two parallel short-circuit slotlines is proposed for analyzing the capacitively coupled slot antenna. Equations as well as design curves are provided. Two conventional antennas are fabricated and measured. The simulated results show good agreement with the measured results.
{"title":"Analysis and design of coplanar waveguide-fed capacitively coupled slot antennas","authors":"Wen‐Hua Tu","doi":"10.1109/IWAT.2015.7365325","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365325","url":null,"abstract":"A design method for coplanar waveguide-fed capacitively coupled slot antenna is presented. An equivalent model of a coupling capacitor and two parallel short-circuit slotlines is proposed for analyzing the capacitively coupled slot antenna. Equations as well as design curves are provided. Two conventional antennas are fabricated and measured. The simulated results show good agreement with the measured results.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"10 20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128520953","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365302
Sung Hoe Kim, Youngsu Kim, Y. Yoon
This paper proposes a reflectarray antenna element operating in X-band composed of a tripole and double rings. The size of the element is half-wavelength and phase curve is achieved by variation of radius of inner ring from 8 GHz to 12 GHz. This element has 544 degrees of phase range at center frequency. By applying this element to electromagnetic gradient surface using 120 degrees phase difference, the result shows broadband radar cross section reduction in X-band.
{"title":"Reflectarray element combined a tripole with double rings and broadband RCS reduction","authors":"Sung Hoe Kim, Youngsu Kim, Y. Yoon","doi":"10.1109/IWAT.2015.7365302","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365302","url":null,"abstract":"This paper proposes a reflectarray antenna element operating in X-band composed of a tripole and double rings. The size of the element is half-wavelength and phase curve is achieved by variation of radius of inner ring from 8 GHz to 12 GHz. This element has 544 degrees of phase range at center frequency. By applying this element to electromagnetic gradient surface using 120 degrees phase difference, the result shows broadband radar cross section reduction in X-band.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129386606","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365269
J. Roberts, R. Ziolkowski
The impedance bandwidth of a near-field resonant parasitic (NFRP) element of an electrically small, metamaterial-inspired Egyptian Axe Dipole (EAD) antenna, can be altered significantly by embedding a non-Foster circuit element into it. The frequency agile behavior of the reactance component internal to the NFRP element of an EAD antenna with a center frequency of 300 MHz is established and a negative impedance converter (NIC) circuit is designed to mimic this behavior. Several other non-Foster circuits have been considered for the NIC implementation and will be discussed in our presentation. A Linvill-based design of the requisite NIC, which contains 4 bipolar junction transistors (BJTs), is presented here. ANSYS HFSS was used for the antenna simulation results; Agilent ADS was used for the circuit simulations. The co-designed, optimized results show an increase in the EAD fractional impedance bandwidth from 0.9% to 46.0%, a factor of over 50 times improvement.
{"title":"Non-foster circuit matching of a near-field resonant parasitic, electrically small antenna","authors":"J. Roberts, R. Ziolkowski","doi":"10.1109/IWAT.2015.7365269","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365269","url":null,"abstract":"The impedance bandwidth of a near-field resonant parasitic (NFRP) element of an electrically small, metamaterial-inspired Egyptian Axe Dipole (EAD) antenna, can be altered significantly by embedding a non-Foster circuit element into it. The frequency agile behavior of the reactance component internal to the NFRP element of an EAD antenna with a center frequency of 300 MHz is established and a negative impedance converter (NIC) circuit is designed to mimic this behavior. Several other non-Foster circuits have been considered for the NIC implementation and will be discussed in our presentation. A Linvill-based design of the requisite NIC, which contains 4 bipolar junction transistors (BJTs), is presented here. ANSYS HFSS was used for the antenna simulation results; Agilent ADS was used for the circuit simulations. The co-designed, optimized results show an increase in the EAD fractional impedance bandwidth from 0.9% to 46.0%, a factor of over 50 times improvement.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122078166","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365267
Y. Ban, J. L. Li
Our group works in the eara of phone antennas in recent years will be reviewed. Firstly, some multiband single phone antennas will be presented, especially where the narrow-frame antenna is firstly proposed for the large touch-screen phone applications. Then, some decoupled antennas for LTE MIMO phone applications will be demonstrated, where two different decoupled techniques including well-designed protruded ground and neutralization line are used. Finally, two multiband antennas for metal-ring phone applications are proposed.
{"title":"Multiband LTE/WWAN phone antennas","authors":"Y. Ban, J. L. Li","doi":"10.1109/IWAT.2015.7365267","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365267","url":null,"abstract":"Our group works in the eara of phone antennas in recent years will be reviewed. Firstly, some multiband single phone antennas will be presented, especially where the narrow-frame antenna is firstly proposed for the large touch-screen phone applications. Then, some decoupled antennas for LTE MIMO phone applications will be demonstrated, where two different decoupled techniques including well-designed protruded ground and neutralization line are used. Finally, two multiband antennas for metal-ring phone applications are proposed.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"183 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120884501","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365305
Hiroyoshi Yamada, Yosuke Wakamatsu, Kohei Sato, Y. Yamaguchi
MIMO technique can improve system performance not only communication system but also radar system. In this paper, we propose a quasi-MIMO Doppler radar for indoor human detection. In the indoor measurements, multipath reflections by wall, floor, and furniture, often make human detection difficult. Doppler filtering is introduced to remove these undesired response and extract radar echoes by human in motion before target detection. Also virtual array technique based on the Khatri-Rao matrix product is introduced in the MIMO radar detection. Experimental results are reported to shown performance improvement especially in angular resolution.
{"title":"Indoor human detection by using quasi-MIMO Doppler radar","authors":"Hiroyoshi Yamada, Yosuke Wakamatsu, Kohei Sato, Y. Yamaguchi","doi":"10.1109/IWAT.2015.7365305","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365305","url":null,"abstract":"MIMO technique can improve system performance not only communication system but also radar system. In this paper, we propose a quasi-MIMO Doppler radar for indoor human detection. In the indoor measurements, multipath reflections by wall, floor, and furniture, often make human detection difficult. Doppler filtering is introduced to remove these undesired response and extract radar echoes by human in motion before target detection. Also virtual array technique based on the Khatri-Rao matrix product is introduced in the MIMO radar detection. Experimental results are reported to shown performance improvement especially in angular resolution.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124764618","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365333
Y. Sugimoto, T. Hori, M. Fujimoto, S. Iwanaga, S. Hori
In order to realize the wireless broadband communication, a small antenna which has the ultra-wideband characteristics is required. The well-known planar monopole antenna features wideband characteristics, small size and simple structure. Thereby, planar monopole antennas of various shapes have been proposed. The paper proposes the T-shaped planar monopole antenna with a basis of rectangular planar monopole antenna. In addition, the structure of T-ledge which has the most broadband characteristics and the limitation of the broadband characteristics are clarified.
{"title":"Broadband characteristics of T-shaped planar monopole antenna","authors":"Y. Sugimoto, T. Hori, M. Fujimoto, S. Iwanaga, S. Hori","doi":"10.1109/IWAT.2015.7365333","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365333","url":null,"abstract":"In order to realize the wireless broadband communication, a small antenna which has the ultra-wideband characteristics is required. The well-known planar monopole antenna features wideband characteristics, small size and simple structure. Thereby, planar monopole antennas of various shapes have been proposed. The paper proposes the T-shaped planar monopole antenna with a basis of rectangular planar monopole antenna. In addition, the structure of T-ledge which has the most broadband characteristics and the limitation of the broadband characteristics are clarified.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123349255","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365367
S. N. Boyko, A. Kukharenko, Yury S. Yaskin
An electronic band gap (EBG) metamaterial construction is presented and described. A construction of a multipath mitigating ground plane, based on the presented EBG metamaterial is described. A method of the ground plane application and installation, which provides the multipath mitigating without spoiling antenna element phase center stability, is described. A designed construction of GNSS antenna module, which contains a presented multipath mitigating ground plane, made from the presented EBG metamaterial and installed in the described way is shown and parameters of the antenna module are provided.
{"title":"EBG metamaterial ground plane application for GNSS antenna multipath mitigating","authors":"S. N. Boyko, A. Kukharenko, Yury S. Yaskin","doi":"10.1109/IWAT.2015.7365367","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365367","url":null,"abstract":"An electronic band gap (EBG) metamaterial construction is presented and described. A construction of a multipath mitigating ground plane, based on the presented EBG metamaterial is described. A method of the ground plane application and installation, which provides the multipath mitigating without spoiling antenna element phase center stability, is described. A designed construction of GNSS antenna module, which contains a presented multipath mitigating ground plane, made from the presented EBG metamaterial and installed in the described way is shown and parameters of the antenna module are provided.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126524430","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365293
H. Tran, I. Park
A planar, inductively coupled-fed, crossed dipole with broadband characteristics is proposed for an ultra-high frequency radio frequency identification tag. By using an inductively coupled feeding technique, the proposed tag antenna achieves a good conjugate impedance matching with the tag chip and yields a -10 dB impedance bandwidth of 92 MHz.
{"title":"Compact crossed dipole antenna for a broadband UHF-RFID tag","authors":"H. Tran, I. Park","doi":"10.1109/IWAT.2015.7365293","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365293","url":null,"abstract":"A planar, inductively coupled-fed, crossed dipole with broadband characteristics is proposed for an ultra-high frequency radio frequency identification tag. By using an inductively coupled feeding technique, the proposed tag antenna achieves a good conjugate impedance matching with the tag chip and yields a -10 dB impedance bandwidth of 92 MHz.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133642306","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365319
K. Sakakibara, Y. Hirayama, T. Araki, N. Kikuma
Two types of millimeter-wave planar array antennas for electronic beam-scanning systems are developed in this work. Several vertically-long sub-arrays are arranged horizontally for beam forming in array signal processing of horizontal plane. On the other hand, the vertically-long sub-arrays are developed in travelling-wave design. The travelling-wave feeding system is advantageous for simple configuration and low-loss operation in millimeter-wave band. Waveguide antennas and microstrip antennas are developed for sub-arrays of electronic beam-scanning systems. Features and advantages of microstrip antennas and waveguide antennas designed for beam-scanning systems are discussed in this paper.
{"title":"Planar array antennas for sub-arrays of electronic beam-scanning systems in millimeter-wave band","authors":"K. Sakakibara, Y. Hirayama, T. Araki, N. Kikuma","doi":"10.1109/IWAT.2015.7365319","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365319","url":null,"abstract":"Two types of millimeter-wave planar array antennas for electronic beam-scanning systems are developed in this work. Several vertically-long sub-arrays are arranged horizontally for beam forming in array signal processing of horizontal plane. On the other hand, the vertically-long sub-arrays are developed in travelling-wave design. The travelling-wave feeding system is advantageous for simple configuration and low-loss operation in millimeter-wave band. Waveguide antennas and microstrip antennas are developed for sub-arrays of electronic beam-scanning systems. Features and advantages of microstrip antennas and waveguide antennas designed for beam-scanning systems are discussed in this paper.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132649532","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365288
G. Kwon, K. Hwang, Youngoo Yang, Kangyoon Lee, C. Seo
The electrostatic boundary-value problem of a dielectric-wedge-backed, slotted conducting wedge is solved to analyze an asymmetric coplanar striplines (ACPS) by using the Mellin transform and a mode-matching method. Numerical computations are performed to assess the characteristics of the ACPS in terms of the strip geometry and relative permittivity of a dielectric substrate. In order to check the validity of our theoretical approach, the computed results are compared with the simulation results as well as the results by the conformal mapping.
{"title":"Capacitance computation of asymmetric coplanar striplines by the mellin transform approach","authors":"G. Kwon, K. Hwang, Youngoo Yang, Kangyoon Lee, C. Seo","doi":"10.1109/IWAT.2015.7365288","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365288","url":null,"abstract":"The electrostatic boundary-value problem of a dielectric-wedge-backed, slotted conducting wedge is solved to analyze an asymmetric coplanar striplines (ACPS) by using the Mellin transform and a mode-matching method. Numerical computations are performed to assess the characteristics of the ACPS in terms of the strip geometry and relative permittivity of a dielectric substrate. In order to check the validity of our theoretical approach, the computed results are compared with the simulation results as well as the results by the conformal mapping.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131756125","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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