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Superconducting microstrip bandpass filter on LaAlO3 with high out-of-band rejection

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2 Author(s)
Reppel, M. ; Wuppertal Univ., Germany ; Mage, J.-C.

A superconducting eight-pole narrow-band filter on lanthanum aluminate substrate material (εr≈4) 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

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:10 ,  Issue: 5 )

Date of Publication:

May 2000

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