High-Temperature Superconducting Receiving Filter Subsystem for Mobile Telecommunication Base Station

Yoshiki UENO  Nobuyoshi SAKAKIBARA  Teruaki YAMADA  Mitsunari OKAZAKI  Masayuki AOKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.7   pp.1172-1176
Publication Date: 1999/07/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: Passive Devices and Circuits
Keyword: 
high-temperature superconductor,  HTS,  filter,  filter subsystem,  frame error rate,  

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Summary: 
High-temperature superconductor (HTS) receiving filter subsystem for mobile telecommunication base station has been developed. An 11-pole HTS filter using YBa2Cu3O7-δ (YBCO) thin films and a low noise amplifier were cooled to 70 K by a small cryocooler. Total noise figure of this subsystem was measured to be 0.5 dB. Furthermore the effect of using the subsystem in the receiver front-end of Code Division Multiple Access (CDMA) cellular base station was investigated. The transmitting power reduction of handy terminal was estimated to be about 35%.