A single-layer transmitting focusing gradient meta-surface (FGMS) has been designed, which is used in the application of the lens antenna. The element of FGMS is composed of two identical structures mounted on the top and bottom surface of one dielectric layer, which can achieve high transmitting efficiency and sufficient phase compensation in X band. The antennas are placed the focus of FGMS to develop a flat lens antenna system. The simulation results demonstrate that the lens achieves a gain of 16.9 dBi and achieves 8.9 dB higher than the bare patch antenna at 10 GHz.
{"title":"Single-layer high-gain planar lens antenna based on the Focusing Gradient Meta-surface","authors":"F. Xue, Shaobin Liu, X. Kong","doi":"10.1002/mmce.22183","DOIUrl":"https://doi.org/10.1002/mmce.22183","url":null,"abstract":"A single-layer transmitting focusing gradient meta-surface (FGMS) has been designed, which is used in the application of the lens antenna. The element of FGMS is composed of two identical structures mounted on the top and bottom surface of one dielectric layer, which can achieve high transmitting efficiency and sufficient phase compensation in X band. The antennas are placed the focus of FGMS to develop a flat lens antenna system. The simulation results demonstrate that the lens achieves a gain of 16.9 dBi and achieves 8.9 dB higher than the bare patch antenna at 10 GHz.","PeriodicalId":198648,"journal":{"name":"2019 International Symposium on Antennas and Propagation (ISAP)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124476650","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 : 2019-10-01DOI: 10.1587/transele.2019mmp0009
Yuta Nakagawa, N. Michishita, H. Morishita
In order to achieve an antenna with robustness to metal for closed space wireless communications, the impedance characteristics of folded monopole antennas (FMA) have been investigated in detail. In this study, we propose the folded monopole antenna, which can switch the input impedance and resonant frequency by a simple method. Simulated results show the antenna which can be switched to three modes with different resonant frequencies and input impedance by controlling the connection of the antenna elements.
{"title":"A Study of Impedance Switched Folded Monopole Antenna with Robustness to Metal","authors":"Yuta Nakagawa, N. Michishita, H. Morishita","doi":"10.1587/transele.2019mmp0009","DOIUrl":"https://doi.org/10.1587/transele.2019mmp0009","url":null,"abstract":"In order to achieve an antenna with robustness to metal for closed space wireless communications, the impedance characteristics of folded monopole antennas (FMA) have been investigated in detail. In this study, we propose the folded monopole antenna, which can switch the input impedance and resonant frequency by a simple method. Simulated results show the antenna which can be switched to three modes with different resonant frequencies and input impedance by controlling the connection of the antenna elements.","PeriodicalId":198648,"journal":{"name":"2019 International Symposium on Antennas and Propagation (ISAP)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115401511","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 : 2019-10-01DOI: 10.1587/transcom.2021ebp3143
Yuki Sunaguchi, T. Tomura, J. Hirokawa
The authors design a plate that controls the beam direction in an aperture array excited by a waveguide 2-plane hybrid coupler. The beam direction can be controlled in a range of ±18-38 deg. in the quasi H-plane, and ±27-54 deg. in the quasi E-plane at the design frequency of 66 GHz. Inductive irises are introduced into tapered waveguides in the plate and suppressed the reflection due to the narrow apertures.
{"title":"Control of Radiation Direction in an Aperture Array excited by a Waveguide 2-plane Hybrid Coupler","authors":"Yuki Sunaguchi, T. Tomura, J. Hirokawa","doi":"10.1587/transcom.2021ebp3143","DOIUrl":"https://doi.org/10.1587/transcom.2021ebp3143","url":null,"abstract":"The authors design a plate that controls the beam direction in an aperture array excited by a waveguide 2-plane hybrid coupler. The beam direction can be controlled in a range of ±18-38 deg. in the quasi H-plane, and ±27-54 deg. in the quasi E-plane at the design frequency of 66 GHz. Inductive irises are introduced into tapered waveguides in the plate and suppressed the reflection due to the narrow apertures.","PeriodicalId":198648,"journal":{"name":"2019 International Symposium on Antennas and Propagation (ISAP)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117089333","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 : 2019-10-01DOI: 10.1587/comex.2020xbl0148
Kohei Jitousho, T. Tomura, J. Hirokawa
In this paper, we propose loading layers of slit pairs with halfwavelength spacing over a corporate-feed waveguide slot array antenna in the 30GHz band. This structure is expected to improve the isolation between transmitting and receiving antennas arranged in the E-plane. As a result of the design, the reflection of the radiating element is suppressed under -14dB over a target band (27.8 GHz - 31.4 GHz). The isolation between two antennas using a 2x32-element model is improved by about 20 dB comparing to the conventional structure without the slit-pair layers.
{"title":"Improvement of Isolation between Transmitting and Receiving Antennas of E-plane arranged Waveguide Slot Arrays by using Layers of Slit pairs with Half-wavelength Spacing","authors":"Kohei Jitousho, T. Tomura, J. Hirokawa","doi":"10.1587/comex.2020xbl0148","DOIUrl":"https://doi.org/10.1587/comex.2020xbl0148","url":null,"abstract":"In this paper, we propose loading layers of slit pairs with halfwavelength spacing over a corporate-feed waveguide slot array antenna in the 30GHz band. This structure is expected to improve the isolation between transmitting and receiving antennas arranged in the E-plane. As a result of the design, the reflection of the radiating element is suppressed under -14dB over a target band (27.8 GHz - 31.4 GHz). The isolation between two antennas using a 2x32-element model is improved by about 20 dB comparing to the conventional structure without the slit-pair layers.","PeriodicalId":198648,"journal":{"name":"2019 International Symposium on Antennas and Propagation (ISAP)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129787339","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 : 2018-06-07DOI: 10.1080/09205071.2018.1482239
T. Satitchantrakul, D. Torrungrueng
This paper proposes quarter-wave-like transformers (QWLTs) with unequal electrical lengths to miniaturize multi-section quarter wave transformers (QWTs) and to enhance the bandwidth. The proposed method extends a study of the approximate theory of small reflections (ATSR) for QWLTs called the extended approximate theory of small reflections (EATSR). The total input reflection coefficient is observed in the frequency range of interest. Results of the EATSR for both two-and three-section unit cells with 25% physical size reduction prove that their impedance bandwidths are broader than those of the standard multi-section QWTs and the ATSR for QWLTs.
{"title":"Compact Wideband Multi-Section Quarter-Wave-Like Transformers with Unequal Electrical Lengths","authors":"T. Satitchantrakul, D. Torrungrueng","doi":"10.1080/09205071.2018.1482239","DOIUrl":"https://doi.org/10.1080/09205071.2018.1482239","url":null,"abstract":"This paper proposes quarter-wave-like transformers (QWLTs) with unequal electrical lengths to miniaturize multi-section quarter wave transformers (QWTs) and to enhance the bandwidth. The proposed method extends a study of the approximate theory of small reflections (ATSR) for QWLTs called the extended approximate theory of small reflections (EATSR). The total input reflection coefficient is observed in the frequency range of interest. Results of the EATSR for both two-and three-section unit cells with 25% physical size reduction prove that their impedance bandwidths are broader than those of the standard multi-section QWTs and the ATSR for QWLTs.","PeriodicalId":198648,"journal":{"name":"2019 International Symposium on Antennas and Propagation (ISAP)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131030561","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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