| Presentation | 2019-01-18 Design of Microstrip Tunable Filtering Antenna with Constant Absolute Bandwidth Tomoyasu Soma, Masataka Ohira, Zhewang Ma, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A tunable antenna that can change its resonant frequency electronically is one of promising components for future wireless communications. Conventional tunable antennas have problems that the return loss characteristic is worse, and the frequency bandwidth is narrower as the resonant frequency is tuned with a varactor diode. To overcome these disadvantages, the co-design approach of tunable bandpass filter and antenna have been applied to a varactor-tuned antenna. However, a constant frequency bandwidth has not been realized yet with a tunable filtering antenna, since frequency characteristics of circuit parameters, such as coupling coefficients, external Q factor, and radiation Q factor, do not meet their requirements determined from a well-established filter theory. This paper proposes a new microstrip tunable filtering antenna having a constant frequency bandwidth, and also presents its design method. As an example, we design a third-order tunable filtering antenna under design specifications of a tuning center-frequency range 1.94-2.16 GHz and a constant frequency bandwidth 60 MHz. The effectiveness of the proposed tunable filtering antenna is verified through fabrication and measurement. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | tunable antenna / filtering antenna / varactor diode / absolute frequency bandwidth |
| Paper # | ED2018-87,MW2018-154 |
| Date of Issue | 2019-01-10 (ED, MW) |
| Conference Information | |
| Committee | MW / ED |
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| Conference Date | 2019/1/17(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hitachi, Central Research Lab. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Compound semiconductor, High speed and High frequency devices/Microwave technologies |
| Chair | Masahiro Muraguchi(TUS) / Kunio Tsuda(Toshiba) |
| Vice Chair | Yoshinori Kogami(Utsunomiya Univ.) / Hiroshi Okazaki(NTT DOCOMO) / Kenichi Tajima(Mitsubishi Electric) / Michihiko Suhara(TMU) |
| Secretary | Yoshinori Kogami(HITACHI) / Hiroshi Okazaki(Utsunomiya Univ.) / Kenichi Tajima(NICT) / Michihiko Suhara(Saga Univ.) |
| Assistant | Mizuki Motoyoshi(Tohoku Univ.) / Satoshi Yoshida(Kagoshima Univ.) / Tatsuya Iwata(TUT) / Junji Kotani(Fjitsu Lab.) |
| Paper Information | |
| Registration To | Technical Committee on Microwaves / Technical Committee on Electron Devices |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Design of Microstrip Tunable Filtering Antenna with Constant Absolute Bandwidth |
| Sub Title (in English) | |
| Keyword(1) | tunable antenna |
| Keyword(2) | filtering antenna |
| Keyword(3) | varactor diode |
| Keyword(4) | absolute frequency bandwidth |
| 1st Author's Name | Tomoyasu Soma |
| 1st Author's Affiliation | Saitama University(Saitama Univ.) |
| 2nd Author's Name | Masataka Ohira |
| 2nd Author's Affiliation | Saitama University(Saitama Univ.) |
| 3rd Author's Name | Zhewang Ma |
| 3rd Author's Affiliation | Saitama University(Saitama Univ.) |
| Date | 2019-01-18 |
| Paper # | ED2018-87,MW2018-154 |
| Volume (vol) | vol.118 |
| Number (no) | ED-402,MW-403 |
| Page | pp.pp.97-102(ED), pp.97-102(MW), |
| #Pages | 6 |
| Date of Issue | 2019-01-10 (ED, MW) |