| Presentation | 2019-11-14 High Efficiency Doherty Amplifier Using T-Shaped Stabs with Spurius Suppression and Impedance Conversion Function Yuki Takagi, Naoki Hasegawa, Yoshichika Ota, Ryo Ishikawa, Kazuhiko Honjo, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In recent years, various types of wireless stations such as a base station used on quasi-millimeter wave band have been studied. For these systems, a size reduction and a high-efficiency technique for power amplifiers are required. The Doherty amplifier has been researched and developed for high-efficiency power amplifier design. However, the Doherty amplifier circuit includes λ/4 transmission lines for impedance conversion and load modulation, which contributes to the circuit size expanding. On the other hand, the harmonics mainly generated by power amplifiers must be suppressed to satisfy spurious specications. In this study, we propose a new circuit-design method using a T-shaped stab for the impedance conversion and the harmonic suppression. The fabricated Doherty amplifier with 64.6 % drain efficiency at a saturated output power of 46.7 dBm was achieved at 2.26 GHz. At 6 dB back-off condition from the saturation, 47.7 % drain efficiency was achieved. In addition, the second and third harmonic spurious levels were reduced to -55.6 dBc and -73.1 dBc, respectively. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | power amplifier / harmonic treatment / high efficiency / GaN HEMT / Doherty |
| Paper # | MW2019-107 |
| Date of Issue | 2019-11-07 (MW) |
| Conference Information | |
| Committee | MW |
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| Conference Date | 2019/11/14(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Minami Daido Villa. Tamokuteki Koryu Center |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Microwave Technologies |
| Chair | Yoshinori Kogami(Utsunomiya Univ.) |
| Vice Chair | Tadashi Kawai(Univ. of Hyogo) / Kensuke Okubo(Okayama Prefectural Univ.) / Shintaro Shinjo(Mitsubishi Electric) |
| Secretary | Tadashi Kawai(Utsunomiya Univ.) / Kensuke Okubo(Fujitsu Labs.) / Shintaro Shinjo |
| Assistant | Satoshi Yoshida(Kagoshima Univ.) / Kyoya Takano(Tokyo Univ. of Science) |
| Paper Information | |
| Registration To | Technical Committee on Microwaves |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | High Efficiency Doherty Amplifier Using T-Shaped Stabs with Spurius Suppression and Impedance Conversion Function |
| Sub Title (in English) | |
| Keyword(1) | power amplifier |
| Keyword(2) | harmonic treatment |
| Keyword(3) | high efficiency |
| Keyword(4) | GaN HEMT |
| Keyword(5) | Doherty |
| 1st Author's Name | Yuki Takagi |
| 1st Author's Affiliation | SoftBank Corp.(SB) |
| 2nd Author's Name | Naoki Hasegawa |
| 2nd Author's Affiliation | SoftBank Corp.(SB) |
| 3rd Author's Name | Yoshichika Ota |
| 3rd Author's Affiliation | SoftBank Corp.(SB) |
| 4th Author's Name | Ryo Ishikawa |
| 4th Author's Affiliation | The University of Electro-Communications(UEC) |
| 5th Author's Name | Kazuhiko Honjo |
| 5th Author's Affiliation | The University of Electro-Communications(UEC) |
| Date | 2019-11-14 |
| Paper # | MW2019-107 |
| Volume (vol) | vol.119 |
| Number (no) | MW-292 |
| Page | pp.pp.41-46(MW), |
| #Pages | 6 |
| Date of Issue | 2019-11-07 (MW) |