| Presentation | 2015-12-17 A Single-layer Planar Filter Structure to Realize Fully Canonical Cul-de-Sac Coupling Matrix and Design of Bandpass Filters with Transmission Zeros Toshiki Kato, Masataka Ohira, Zhewang Ma, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A Cul-de-Sac coupling matrix can be obtained by matrix transformation from a transversal array coupling matrix that can synthesize a bandpass filter with transmission zeros (TZs) at arbitrary frequencies, and also it does not need a multi-branch circuit for excitation. So far a waveguide filter and a two-layer microstrip filter have been reported to provide the Cul-de-Sac coupling matrix, but the Cul-de-Sac coupling matrix has not been realized by a single-layer planar structure yet. In this paper, we propose a single-layer planar microstrip structure to implement a fully canonical Cul-de-Sac coupling matrix that can produce the maximum number of TZs. For the filter design considering a frequency-dependent direct S/L coupling, a circuit synthesis with the help of optimization technique is introduced, so that a bandpass filter can be easily designed with evaluation of coupling coefficient and external Q factor. As an example, we design a bandpass filter with 2-GHz center frequency, 6% bandwidth in passband, and four TZs located very near the passband, resulting in very high skirt selectivity. Finally, the validity of the proposed structure is verified by the comparison between the simulated and measured results. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Bandpass filters / transmission zeros / fully Canonical Cul-de-Sac coupling matrix / direct S/L coupling |
| Paper # | MW2015-142 |
| Date of Issue | 2015-12-10 (MW) |
| Conference Information | |
| Committee | MW |
|---|---|
| Conference Date | 2015/12/17(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Univ. of Science |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Students Session / Microwave Technologies |
| Chair | Yohei Ishikawa(Kyoto Univ.) |
| Vice Chair | Masashi Nakatsugawa(NTT) / Takao Kuki(Kokushikan Univ.) / Kenjiro Nishikawa(Kagoshima Univ.) |
| Secretary | Masashi Nakatsugawa(NTT) / Takao Kuki(Panasonic) / Kenjiro Nishikawa |
| Assistant | Ryo Ishikawa(Univ. of Electro-Comm.) / Naoto Sekiya(Univ. of Yamanashi) |
| Paper Information | |
| Registration To | Technical Committee on Microwaves |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Single-layer Planar Filter Structure to Realize Fully Canonical Cul-de-Sac Coupling Matrix and Design of Bandpass Filters with Transmission Zeros |
| Sub Title (in English) | |
| Keyword(1) | Bandpass filters |
| Keyword(2) | transmission zeros |
| Keyword(3) | fully Canonical Cul-de-Sac coupling matrix |
| Keyword(4) | direct S/L coupling |
| 1st Author's Name | Toshiki Kato |
| 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 | 2015-12-17 |
| Paper # | MW2015-142 |
| Volume (vol) | vol.115 |
| Number (no) | MW-372 |
| Page | pp.pp.53-58(MW), |
| #Pages | 6 |
| Date of Issue | 2015-12-10 (MW) |