Accurate design of compact forward-coupled microstrip filters using an integral-equation field solver
✍ Scribed by Zhang, Dawei ;Liang, Guo-Chun ;Shih, Chien-Fu ;Johansson, Marie E. ;Withers, Richard S.
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 693 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1050-1827
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✦ Synopsis
Abstract
In this article, we present forward‐coupled microstrip filters designed using an integral‐equation‐based field solver, and fabricated in high‐temperature superconducting (HTS) thin films. Two designs were studied, one a nine‐pole bandpass filter at 900 MHz with 25‐MHz bandwidth, and the other a five‐pole bandpass filter at 2 GHz with 24‐MHz bandwidth and 10‐Ω resonator characteristic impedance. Both designs were fabricated using YBa~2~Cu~3~O~7~ (YBCO) HTS thin films. Measurements showed excellent agreements with the simulation predictions. For the nine‐pole filter design, a measured insertion loss of 0.3 dB, and a measured return loss of 16 dB were achieved in the YBCO filter at 77 K. © 1995 John Wiley & Sons, Inc.