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HTS 4-pole bandpass filters with closed loop resonators and coupled lines using YBCO thin films for PCS

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4 Author(s)
Kwang-Yong Kang ; Res. Lab., Electron. & Telecommun. Res. Inst., Taejon, South Korea ; Seok Kil Han ; Yeon-Su Ha ; Jeha Kim

We designed, fabricated and characterized new type high temperature superconducting (HTS) 4-pole bandpass filters. We prepared epitaxial YBa2Cu3O7-x (YBCO) thin films on MgO substrates by using a hollow cathode sputtering method. To reduce the physical size of the filter pattern, we used closed-loop resonators and parallel coupled-lines on the basis of a microwave circuit design theory. We observed that the HTS bandpass filters exhibited a center frequency of 3.9 GHz, a low insertion loss of about 0.42 dB, and an high skirt selectivity of 200 dB/GHz. The value of third order intercept measured at 80 K and at center frequency of 3.9 GHz was about 95 dBm

Published in:

Microwave Conference Proceedings, 1997. APMC '97, 1997 Asia-Pacific  (Volume:1 )

Date of Conference:

2-5 Dec 1997