Title :
A 5-GHz band coplanar-waveguide high temperature superconducting filter employing T-form open gap
Author :
Koizumi, Daisuke ; Satoh, Kei ; Narahashi, Shoich
Author_Institution :
Wireless Lab., NTT DoCoMo Inc., Yokosuka, Japan
Abstract :
This paper presents a coplanar-waveguide (CPW) high-temperature superconducting (HTS) filter that has a T-form open gap as an input/output coupling structure to reduce the fluctuation in filter characteristics caused by dimension errors originating from the manufacturing processes of the filter. Numerical and experimental investigations based on a 5-GHz band CPW HTS filter confirm that T-form structure suppresses the fluctuation to a level lower than the existing structure. The fabricated filter has a center frequency of 5.006 GHz, a 3.5% (175 MHz) equal ripple bandwidth, a 0.11-dB ripple, and a 0.11-dB average insertion loss, all measured at 60 K.
Keywords :
coplanar waveguides; high-temperature superconductors; microwave filters; 0.11 dB; 5 GHz; CPW; T-form open gap; coplanar-waveguide; high temperature superconducting filter; input-output coupling structure; insertion loss; manufacturing processes; Band pass filters; Conductors; Coplanar waveguides; Frequency; High temperature superconductors; Microwave filters; Resonator filters; Robustness; Superconducting filters; Superconducting microwave devices;
Conference_Titel :
Radio and Wireless Symposium, 2006 IEEE
Print_ISBN :
0-7803-9412-7
DOI :
10.1109/RWS.2006.1615224
