Spurious Suppression Effect by Transmit Bandpass Filters with HTS Dual-Mode Resonators for 5 GHz Band

Kazunori YAMANAKA  Kazuaki KURIHARA  Akihiko AKASEGAWA  Masatoshi ISHII  Teru NAKANISHI  

IEICE TRANSACTIONS on Electronics   Vol.E92-C   No.3   pp.288-295
Publication Date: 2009/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.288
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Recent Progress in Superconducting Analog Devices and Their Applications)
superconducting filter,  spurious suppression,  YBCO,  power,  transmit,  

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We report on the spurious suppression effect in low-microwave power transmitters by high temperature superconducting (HTS) bandpass filters (BPFs) which are promising for devices requiring BPFs with high-frequency selectivity. Some of the major issues on the power BPFs with HTS planar circuits for wireless communication applications are reviewed. As a case study for the HTS filter and its spurious suppression effect, this paper describes an example of the measured power spectrum density (PSD) on the suppression effect by one of our developed power BPFs with YBCO films for the 5 GHz band. It was designed with equivalent cascade resonators of 16 poles. We demonstrated the effect by HTS power filter in a power amplifier for the 5 GHz band.