Compact Mode-Composite Bandpass Filter and Diplexer With Flexible Transmission Zeros Control Based on Mixed Electro-Magnetic and Source-Load Coupling Mechanism

IF 1 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Microwave and Optical Technology Letters Pub Date : 2025-04-23 DOI:10.1002/mop.70204

Shuai Zhu, Xiang Wang, Hang Yang, Ke-Long Sheng, Huangyan Li, Boyu Sima, Zhi-Yuan Zong, Wen Wu

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Abstract

This paper presents a series of mode-composite bandpass filters (BPFs) and diplexer, which integrate both electro-magnetic (EM) and source-load (SL) coupling within the hybrid eighth-mode substrate-integrated waveguide (EMSIW) and microstrip line (MSL) resonators. The mixed EM coupling can achieve a distinct distribution of transmission zeros (TZs), and SL coupling can further enhance the selectivity near the operating passband. Case I presents a mode-composite BPF operating at 3.5 GHz. The proposed BPF employs SL coupling and EM coupling, with electric coupling (EC) being predominant. Consequently, this configuration yields three TZs adjacent to the passband: one to the left and two to the right. Case II presents a similar BPF design operating at 5.6 GHz, but with magnetic coupling (MC) dominating the mixed EM coupling. This configuration also results in three TZs near the passband: one to the right and two to the left. To demonstrate and validate the novel property, both types of mode-composite BPFs and the relevant diplexer have been designed, fabricated, and measured. The simulation and measurement have reached to a satisfactory agreement.

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基于混合电磁和源负载耦合机制的紧凑模式复合带通滤波器和柔性传输零控制双工器

本文介绍了一系列模式复合带通滤波器（BPF）和双工器，它们在混合八模基底集成波导（EMSIW）和微带线（MSL）谐振器内集成了电磁（EM）耦合和源负载（SL）耦合。混合电磁耦合可实现明显的传输零点（TZ）分布，而源负载耦合可进一步提高工作通带附近的选择性。案例 I 介绍了一种工作频率为 3.5 GHz 的模式复合 BPF。拟议的 BPF 采用 SL 耦合和 EM 耦合，其中电耦合（EC）占主导地位。因此，这种配置产生了三个邻近通带的 TZ：一个在左，两个在右。案例 II 采用了类似的 BPF 设计，工作频率为 5.6 GHz，但磁耦合（MC）在混合电磁耦合中占主导地位。这种配置也会在通带附近产生三个 TZ：一个在右侧，两个在左侧。为了演示和验证这种新特性，我们设计、制造并测量了这两种类型的模式复合 BPF 和相关的双工器。模拟和测量结果达到了令人满意的一致。

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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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