Inline Waveguide Filters With Transmission Zeros Using Frequency-Variant Couplings

IF 4.5 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Microwave Theory and Techniques Pub Date : 2025-02-20 DOI:10.1109/TMTT.2025.3541149

Mohammad Mehrabi Gohari;Oleksandr Glubokov;Joachim Oberhammer

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引用次数: 0

Abstract

This article introduces a novel frequency-variant coupling structure with high adjustability for waveguide filters. Although this structure is proposed for rectangular cavities, the same principle can be applied to other cavity geometries. The proposed structure is compatible with standard micromachining technologies. Using this coupling structure, two inline Nth-order waveguide filters with

$N-1$

and

$N+1$

transmission zeros (TZs) are developed. A fourth-order bandpass filter (BPF) with three TZs at 245, 285, and 288 GHz is designed, operating at a center frequency of 270 GHz with a 2% fractional bandwidth. In addition, a second-order BPF with a center frequency of 280 GHz and a 0.71% fractional bandwidth, utilizing three TZs at 230, 300, and 308 GHz, is also developed. Prototypes of both filters are fabricated using silicon micromachining. The measured insertion loss and return loss (RL) in the passband are 2 dB and better than 18 dB, respectively, for the fourth-order filter and 2.1 dB and better than 11 dB for the second-order filter, respectively.

查看原文本刊更多论文

使用变频耦合的传输零的内联波导滤波器

本文介绍了一种新型的高可调变频耦合结构。虽然这种结构是针对矩形空腔提出的，但同样的原理也适用于其他几何形状的空腔。该结构与标准微加工技术兼容。利用这种耦合结构，开发了两个具有$N-1$和$N+1$传输零点（TZs）的内联N阶波导滤波器。设计了一种四阶带通滤波器（BPF），具有245,285和288ghz的三个TZs，工作在270ghz的中心频率，分数带宽为2%。此外，还开发了一种中心频率为280 GHz，分数带宽为0.71%的二阶BPF，利用230ghz、300 GHz和308 GHz的三个TZs。这两种滤波器的原型都是用硅微机械加工制造的。四阶滤波器通带内的插入损耗和回波损耗（RL）分别为2 dB和大于18 dB，二阶滤波器通带内的插入损耗和回波损耗分别为2.1 dB和大于11 dB。

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

IEEE Transactions on Microwave Theory and Techniques 工程技术-工程：电子与电气

CiteScore

8.60

自引率

18.60%

发文量

486

审稿时长

6 months

期刊介绍： The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.