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An HTS 21-pole microstrip filter for IMT-2000 base stations with steep attenuation

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3 Author(s)
Hattori, W. ; Fundamental Res. Labs., NEC Corp., Ibaraki, Japan ; Yoshitake, T. ; Takahashi, K.

We developed a 21-pole high-temperature superconductor thin-film microstrip filter with steep attenuation. This filter is applicable in the International Mobile Telecommunications-2000 (IMT-2000) base station receiver system, where high selectivity is needed to avoid interference from signals in the personal handyphone system (PHS) band just below the IMT-2000 band. The out-of-band rejection of this filter 1 MHz below the passband edge is more than 40 dB. Owing to the improvements of the design and the fabrication processes, we also eliminated the need for a tuning process in the fabrication processes in order to reduce the production costs and the turnaround time.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 3 )

Date of Publication:

Sep 2001

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