Reconfigurable Dual-Band Balanced Filter Using Quad-Mode Cavity Resonator

IF 1.2 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Microwave and Optical Technology Letters Pub Date : 2025-09-10 DOI:10.1002/mop.70397

Shiyi Shen, Xin Fang, Zhentian Wu, Xiaoming Chen, Lixia Yang

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Abstract

A reconfigurable dual-band balanced filter using quad-mode cavity resonator is proposed in this letter. A rectangular cavity embedded with four pairs of metal posts is adopted as the quad-mode resonator, microstrip feeding lines could generate two pairs of degenerate modes of the cavity under differential-mode (DM) excitation, and then form two passbands. Meanwhile they could be highly rejected under common-mode (CM) excitation. Tuning screws are inserted in the center of cavity to provide frequency and external coupling modulation between the two passbands, and then the frequency of the lower band could be adjusted independently. From the measured results, the center frequency of the lower band varies from 9.41 to 9.65 GHz, while the upper band is fixed at 10.98 GHz. Over the frequency tuning range, the dual-band response shows insertion losses of 0.52 and 41 dB CM suppression. The proposed reconfigurable filter is potential for applications in base stations and satellite communication systems requiring multi-channel, high anti-interference properties.

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使用四模腔谐振器的可重构双带平衡滤波器

本文提出了一种基于四模腔谐振器的可重构双带平衡滤波器。采用嵌有四对金属桩的矩形腔体作为四模谐振器，微带馈线在差模（DM）激励下产生两对腔体的简并模式，然后形成两个通带。同时，它们在共模（CM）激励下被高度抑制。在腔体中心插入调谐螺钉，提供两个通带之间的频率和外部耦合调制，然后可以独立调节下频段的频率。从测量结果来看，下频段的中心频率在9.41 ~ 9.65 GHz之间变化，而上频段的中心频率固定在10.98 GHz。在频率调谐范围内，双波段响应显示插入损耗为0.52和41 dB CM抑制。提出的可重构滤波器在需要多通道、高抗干扰性能的基站和卫星通信系统中具有应用潜力。

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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来源期刊

Microwave and Optical Technology Letters 工程技术-工程：电子与电气

CiteScore

3.40

自引率

20.00%

发文量

371

审稿时长

4.3 months

期刊介绍： Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas. - RF, Microwave, and Millimeter Waves - Antennas and Propagation - Submillimeter-Wave and Infrared Technology - Optical Engineering All papers are subject to peer review before publication