| Presentation | 2018-11-15 Miniaturization of Harmonic Impedance Transformer and its Application to Class-F Amplifiers Kento Saiki, Shinichi Tanaka, Ryo Ishikawa, Kazuhiko Honjo, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A new method of miniaturizing the quarter-wavelength ($lambda$/4) harmonic impedance (Z) transformer in a class-F amplifier is presented. The proposed Z-transformer, consisting of a short microstrip line (< $lambda$/4), a shunt inductance and series capacitance, is equivalent to conventional $lambda$/4 Z-transformer in that it transforms the RF-shorts at the 2nd and 3rd harmonics to a short and an open at the respective harmonic frequencies. Furthermore, it provides a DC-bias feed path along the shunt inductor, eliminating the need to use additional DC biasing circuit and thus reducing the footprint of the whole amplifier circuit. We also conducted a theoretical trade-off design analysis, considering various limitations faced when implementing the proposed circuit to practical amplifiers. By combining the optimized Z-transformer and a compact CRLH transmission line stub (for harmonic shorts), we fabricated a 2-GHz GaN HEMT class-F power amplifier with good performance of 40.6 dBm output power and 74.6% power-added efficiency. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Class-F amplifier / Impedance transformer / CRLH / Harmonic tuning / Power-added efficiency |
| Paper # | MW2018-93 |
| Date of Issue | 2018-11-08 (MW) |
| Conference Information | |
| Committee | MW |
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| Conference Date | 2018/11/15(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Fukue Cultural Hall |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Microwave Technologies |
| Chair | Masahiro Muraguchi(TUS) |
| Vice Chair | Yoshinori Kogami(Utsunomiya Univ.) / Hiroshi Okazaki(NTT DOCOMO) / Kenichi Tajima(Mitsubishi Electric) |
| Secretary | Yoshinori Kogami(HITACHI) / Hiroshi Okazaki(Utsunomiya Univ.) / Kenichi Tajima |
| Assistant | Mizuki Motoyoshi(Tohoku Univ.) / Satoshi Yoshida(Kagoshima Univ.) |
| 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) | Miniaturization of Harmonic Impedance Transformer and its Application to Class-F Amplifiers |
| Sub Title (in English) | |
| Keyword(1) | Class-F amplifier |
| Keyword(2) | Impedance transformer |
| Keyword(3) | CRLH |
| Keyword(4) | Harmonic tuning |
| Keyword(5) | Power-added efficiency |
| 1st Author's Name | Kento Saiki |
| 1st Author's Affiliation | Shibaura Institute of Technology(Shibaura Inst. of Tech.) |
| 2nd Author's Name | Shinichi Tanaka |
| 2nd Author's Affiliation | Shibaura Institute of Technology(Shibaura Inst. of Tech.) |
| 3rd Author's Name | Ryo Ishikawa |
| 3rd Author's Affiliation | University of Electro-Communications(Univ. of Electro-Communications) |
| 4th Author's Name | Kazuhiko Honjo |
| 4th Author's Affiliation | University of Electro-Communications(Univ. of Electro-Communications) |
| Date | 2018-11-15 |
| Paper # | MW2018-93 |
| Volume (vol) | vol.118 |
| Number (no) | MW-308 |
| Page | pp.pp.7-12(MW), |
| #Pages | 6 |
| Date of Issue | 2018-11-08 (MW) |