Tunable narrowband bandpass filter using higher order microstrip ring resonator

N. Luong, Xiaowei Zhu, Jing Liu
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引用次数: 2

Abstract

A type of tunable narrow-bandpass filter is proposed in this paper. Fourth-order microstrip ring resonator with magnetic coupling is employed and loaded with varactors for achieving agility in the filter response. The simulation result showed that the center frequency of the proposed filter can be adjusted from 698 to 886 MHz and tuning range of 188 MHz, 1-dB constant absolute bandwidth of 9 MHz and insertion loss less than 10 dB are obtained. Additionally, the out-of-band rejection is improved by two transmission zeros which located on lower-side and higher-side of the pass-band. The measured performance of the fabricated filter shows good agreement with the proposed theory.
采用高阶微带环形谐振器的可调谐窄带带通滤波器
本文提出了一种可调谐窄带通滤波器。采用带磁耦合的四阶微带环形谐振腔,并加载变容管,实现了滤波器响应的敏捷性。仿真结果表明,该滤波器的中心频率可在698 ~ 886 MHz范围内调节,调谐范围为188 MHz, 1 dB恒定绝对带宽为9 MHz,插入损耗小于10 dB。此外,通过在通频带的下侧和高侧设置两个传输零点,提高了带外抑制性能。所制备滤波器的实测性能与所提出的理论基本一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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