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IEEE Microwave and Guided Wave Letters
Volume 10 Number 5, May 2000

Table of Contents for this issue

Complete paper in PDF format

Superconducting Microstrip Bandpass Filter on LaAlO3 with High Out-of-Band Rejection

Michael Reppel and Jean-Claude Mage

Page 180.

Abstract:

A superconducting eight-pole narrow-band filter on lanthanum aluminate substrate material (r 24) is introduced. The filter has a center frequency of 1.8 GHz and a fractional bandwidth of 0.84%. Steep filter skirts ( 20 dB at 700 kHz) and high out-of-band rejection ( 60 dB at 5 MHz) have been achieved by a quasi-elliptic filter design with two transmission zero pairs. The measured high-quality factor of 60 000 at 70 K results in an insertion loss of less than 0.3 dB in the passband and 0.5 dB at the band edges.

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