Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line Coupler
This study proposes a dual-circularly polarized Reduced-Surface-Wave (RSW) antenna which has a compact and simple structure by the integration of a via-loaded annular-ring (VLAR)-RSW antenna with a branch-line coupler. The fundamental characteristics of a VLAR-RSW antenna are analyzed through simula...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IEEE
2020-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9143109/ |
| _version_ | 1818430611783680000 |
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| author | Seishiro Kojima Naoki Shinohara Tomohiko Mitani |
| author_facet | Seishiro Kojima Naoki Shinohara Tomohiko Mitani |
| author_sort | Seishiro Kojima |
| collection | DOAJ |
| description | This study proposes a dual-circularly polarized Reduced-Surface-Wave (RSW) antenna which has a compact and simple structure by the integration of a via-loaded annular-ring (VLAR)-RSW antenna with a branch-line coupler. The fundamental characteristics of a VLAR-RSW antenna are analyzed through simulations in detail. In general, stronger mutual coupling between RSW antennas occurs in comparison with conventional patch antennas when the element spacing is small, since the effect of the close physical distance becomes larger than the effect of surface wave suppression. It is shown that the VLAR antenna can reduce the mutual coupling than the conventional antenna by selecting the appropriate radius at each element spacing, even when the element spacing is small. A matching circuit is generally required for an annular-ring antenna because of the high input impedance when exciting the TM11 mode. In contrast, for the VLAR-RSW antenna, impedance matching is feasible without a matching circuit by adjusting the distance between the feed position and the shorting vias. Measured results show the performance of the developed dual-circularly polarized antenna is in agreement with the simulation. At 5.8GHz, the measured axial ratios of both polarizations are smaller than 0.6dB and the measured isolation between ports is about 29 dB. Moreover, it is shown that the developed antenna reduces mutual coupling than the conventional patch antenna because of the effect of suppressing surface waves. |
| first_indexed | 2024-12-14T15:36:10Z |
| format | Article |
| id | doaj.art-f1b935e11f034f8f9c7cfae025192262 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-14T15:36:10Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-f1b935e11f034f8f9c7cfae0251922622022-12-21T22:55:43ZengIEEEIEEE Access2169-35362020-01-01813364513365310.1109/ACCESS.2020.30100619143109Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line CouplerSeishiro Kojima0https://orcid.org/0000-0002-2915-0710Naoki Shinohara1Tomohiko Mitani2https://orcid.org/0000-0002-8544-2558Research Institute for Sustainable Humanosphere, Kyoto University, Uji, JapanResearch Institute for Sustainable Humanosphere, Kyoto University, Uji, JapanResearch Institute for Sustainable Humanosphere, Kyoto University, Uji, JapanThis study proposes a dual-circularly polarized Reduced-Surface-Wave (RSW) antenna which has a compact and simple structure by the integration of a via-loaded annular-ring (VLAR)-RSW antenna with a branch-line coupler. The fundamental characteristics of a VLAR-RSW antenna are analyzed through simulations in detail. In general, stronger mutual coupling between RSW antennas occurs in comparison with conventional patch antennas when the element spacing is small, since the effect of the close physical distance becomes larger than the effect of surface wave suppression. It is shown that the VLAR antenna can reduce the mutual coupling than the conventional antenna by selecting the appropriate radius at each element spacing, even when the element spacing is small. A matching circuit is generally required for an annular-ring antenna because of the high input impedance when exciting the TM11 mode. In contrast, for the VLAR-RSW antenna, impedance matching is feasible without a matching circuit by adjusting the distance between the feed position and the shorting vias. Measured results show the performance of the developed dual-circularly polarized antenna is in agreement with the simulation. At 5.8GHz, the measured axial ratios of both polarizations are smaller than 0.6dB and the measured isolation between ports is about 29 dB. Moreover, it is shown that the developed antenna reduces mutual coupling than the conventional patch antenna because of the effect of suppressing surface waves.https://ieeexplore.ieee.org/document/9143109/Annular-ring patch antennabranch-line couplerdual-circular polarizationmutual couplingreduced-surface-wave |
| spellingShingle | Seishiro Kojima Naoki Shinohara Tomohiko Mitani Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line Coupler IEEE Access Annular-ring patch antenna branch-line coupler dual-circular polarization mutual coupling reduced-surface-wave |
| title | Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line Coupler |
| title_full | Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line Coupler |
| title_fullStr | Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line Coupler |
| title_full_unstemmed | Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line Coupler |
| title_short | Integration of a Via-Loaded Annular-Ring Reduced-Surface-Wave Antenna and a Branch-Line Coupler |
| title_sort | integration of a via loaded annular ring reduced surface wave antenna and a branch line coupler |
| topic | Annular-ring patch antenna branch-line coupler dual-circular polarization mutual coupling reduced-surface-wave |
| url | https://ieeexplore.ieee.org/document/9143109/ |
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