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A 5 GHz high-temperature superconducting reaction-type transmitting filter based upon split open-ring resonators
| Title: | A 5 GHz high-temperature superconducting reaction-type transmitting filter based upon split open-ring resonators |
| Authors: | Futatsumori, S. Browse this author | | Hikage, T. Browse this author →KAKEN DB | | Nojima, T. Browse this author →KAKEN DB | | Akasegawa, A. Browse this author | | Nakanishi, T. Browse this author | | Yamanaka, K. Browse this author |
| Issue Date: | Apr-2008 |
| Publisher: | IOP Publishing |
| Journal Title: | Superconductor Science and Technology |
| Volume: | 21 |
| Issue: | 4 |
| Start Page: | 045014 |
| Publisher DOI: | 10.1088/0953-2048/21/4/045014 |
| Abstract: | A new kind of high-temperature superconducting (HTS) transmitting filter based on a reaction-type resonator is presented. The purpose of an HTS reaction-type filter (HTS-RTF) is to eliminate the intermodulation distortion noise generated by microwave power amplifiers such as those employed in mobile base stations. An HTS-RTF enables both higher power handling capability and sharper cutoff characteristics compared to existing planar-type HTS transmitting filters, since a reaction-type resonator does not resonate with high-power fundamental signals. To achieve steep skirt characteristics and high-power handling capability simultaneously, a 5-GHz three-pole HTS-RTF using split open-ring resonator is designed. This split open-ring resonator offers low maximum current densities and a high-unloaded Q-factor with low radiation. The designed prototype filter has Chebyshev characteristics with a centre frequency of 4.95 GHz and a bandwidth of 1.5 MHz. The HTS-RTF is fabricated using a double-sided YBa_2C_3O_[7-δ] thin film deposited on a 0.5 mm thick MgO substrate. The measured filter shows an insertion loss of less than 0.1 dB and a third intermodulation distortion value of - 56.7 dBc for a 40 dBm passband signal. In addition, adjacent channel leakage power ratio (ACLR) measurements using an actual Wideband CDMA signal confirm an ACLR improvement of about 10 dB for a four-carrier signal with power of up to 40 dBm. |
| Rights: | This is an author-created, un-copyedited version of an article accepted for publication in Superconductor Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at 10.1088/0953-2048/21/4/045014. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/39005 |
| Appears in Collections: | 情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 二ッ森 俊一
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