Design and Performance of Miniaturized HTS Coplanar Waveguide Bandpass Filters with Highly Packed Meanderlines

Haruichi KANAYA  Yoko KOGA  Tatsunori SHINTO  Keiji YOSHIDA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.708-713
Publication Date: 2002/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Microwave Devices and Systems
Keyword: 
microwave device,  bandpass filter,  coplanar waveguide,  HTS passive device,  

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Summary: 
We propose the new and highly accurate design theory of the high Tc superconducting (HTS) miniaturized coplanar waveguide (CPW) bandpass filters (BPFs) with highly packed meanderlines. BPFs are designed using the external quality factor (Qe) and coupling constant (k) (Q-k method). These parameters are estimated from the transmission coefficient obtained by the 2.5-dimensional electromagnetic field simulator. Moreover, the Q-k method is compared with the J-b method (designed using admittance inverter and susceptance slope parameter) presented previously; in this way we confirmed that the Q-k method has higher accuracy than the J-b method. We realized the design of a the highly packed meanderline CPW BPF (5 pole, center frequency = 2 GHz, fractional band width = 15 MHz, ripple = 0.1 dB) in a 3.5 mm 8 mm substrate.