Designing Coplanar Superconducting Lumped-Element Bandpass Filters Using a Mechanical Tuning Method

Shigeki HONTSU
Kazuyuki AGEMURA
Hiroaki NISHIKAWA
Masanobu KUSUNOKI

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.2    pp.151-155
Publication Date: 2006/02/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.2.151
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting High-frequency Devices)
Category: 
Keyword: 
lumped-element bandpass filter,  coplanar type circuit,  mechanical tuning,  software-defined radio (SDR),  

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Summary: 
A coplanar type lumped-element 6-pole microwave Chebyshev bandpass filter (BPF) of center frequency (f0) 2.0 GHz and fractional bandwidth (FBW) 1.0 % was designed. For the design method, theory of direct coupled resonator filters using K-inverters was employed. Coplanar type lumped-element BPFs are composed of a meander-line L and interdigital C elements. The frequency response was simulated and analyzed using an electromagnetic field simulator (Sonnet-EM). Further, the changes in f0 and FBW of the BPF were also realized by the mechanical tuning method.