| Presentation | 2021-09-09 Fundamental Examination of Beam Reflection Circuit Using Butler Matrix Yusaku Honma, Noriharu Suematsu, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In backscatter system such as Radio Frequency Identification (RFID), increasing the gain of the tag antennas is an important task for extending the communication range. Since the arrival direction of a radio wave to the tag are irregular, the antenna for backscatter system that can reflect to the arrival direction is required for increasing the gain. In this paper, we propose a beam reflector composed of a one-dimensional array antenna and a Butler matrix for this purpose. First, we show the principle of the circuit, then we evaluate with a circuit simulator that signals given to input ports of the array antenna with an arbitrary phase difference can reflect with the opposite phase difference by using the proposed circuit. It means that the radio wave can reradiate to the arrival direction from the one-dimensional array antenna. Furthermore, we examine applying the circuit to a two-dimensional array antenna. This beam reflection circuit can use as a radio equipment for backscatter by switching terminals of the Butler matrix simultaneously. In addition, by integrating the circuit and antennas into a multilayer dielectric substrate, it can become a compact and thin module. Thus, this configuration is a optimal for increasing the gain of RFID tags. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Butler matrix / array antenna / beam forming / reflector / backscatter / RFID / radar |
| Paper # | MW2021-33 |
| Date of Issue | 2021-09-02 (MW) |
| Conference Information | |
| Committee | MW / AP |
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| Conference Date | 2021/9/9(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Microwave, Millimeter wave |
| Chair | Noriharu Suematsu(Tohoku Univ.) / Hiroshi Yamada(Niigata Univ.) |
| Vice Chair | Tadashi Kawai(Univ. of Hyogo) / Kensuke Okubo(Okayama Prefectural Univ.) / Hideyuki Nakamizo(Mitsubishi Electric) / Mitoshi Fujimoto(Fukui Univ) |
| Secretary | Tadashi Kawai(Saitama Univ.) / Kensuke Okubo(Toshiba) / Hideyuki Nakamizo(NTT DOCOMO) / Mitoshi Fujimoto(National Defense Academy) |
| Assistant | Naoki Hasegawa(Softbank) / Kosuke Katayama(Waseda Univ.) / Dr. Kim(Niigata Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Microwaves / Technical Committee on Antennas and Propagation |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Fundamental Examination of Beam Reflection Circuit Using Butler Matrix |
| Sub Title (in English) | |
| Keyword(1) | Butler matrix |
| Keyword(2) | array antenna |
| Keyword(3) | beam forming |
| Keyword(4) | reflector |
| Keyword(5) | backscatter |
| Keyword(6) | RFID |
| Keyword(7) | radar |
| 1st Author's Name | Yusaku Honma |
| 1st Author's Affiliation | Tohoku University(Tohoku Univ.) |
| 2nd Author's Name | Noriharu Suematsu |
| 2nd Author's Affiliation | Tohoku University(Tohoku Univ.) |
| Date | 2021-09-09 |
| Paper # | MW2021-33 |
| Volume (vol) | vol.121 |
| Number (no) | MW-169 |
| Page | pp.pp.1-5(MW), |
| #Pages | 5 |
| Date of Issue | 2021-09-02 (MW) |