Multiband waveguide filters with advanced filtering characteristics based on an in-band transmission zeros method and stacked cylindrical resonators

IF 1.1 4区 计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC
Povilas Vaitukaitis, Jiayu Rao, Kenneth Nai, Jiasheng Hong
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引用次数: 0

Abstract

This paper significantly improves the previously proposed novel multiband waveguide filter implementation employing cylindrical resonators. The improved model has the advantages of a further reduced footprint using stacking shunt resonators horizontally and vertically and the ability to realise advanced filtering functions, including transmission zeros below and above the passbands. The coupling matrix synthesis with a brief example and a detailed filter design with considerations for additional coupling and in-line and folded topologies is given. Several filter prototypes, namely third-order quad-band and quintuple-band in-line filters and a sixth-order dual-band folded filter in Ku-band, were designed to validate the proposed model. Selective laser melting (SLM), a metal 3-D printing technique where metal powder is selectively melted with a laser layer by layer, was used to fabricate a dual-band folded filter prototype in copper to validate the proposed model since the model has a complex inner geometry. Additionally, selective laser melting has the advantage of monolithic near-net shape fabrication, eliminating assembly, improving reliability, and reducing weight. The measured results show good agreement with the simulations.

Abstract Image

基于带内传输零点法和叠层圆柱谐振器的具有高级滤波特性的多频带波导滤波器
本文显著改进了先前提出的采用圆柱谐振器的新型多波段波导滤波器的实现。改进模型的优点是,通过水平和垂直堆叠分流谐振器,进一步减少了占用空间,并能够实现高级滤波功能,包括在通带下方和上方的传输零点。给出了耦合矩阵的综合,并给出了一个简单的例子和考虑附加耦合、内联拓扑和折叠拓扑的详细滤波器设计。设计了几种滤波器原型,即三阶四带和五带直列滤波器以及ku波段的六阶双带折叠滤波器,以验证所提出的模型。选择性激光熔化(SLM)是一种金属3d打印技术,利用激光逐层选择性熔化金属粉末,以铜为材料制作双带折叠滤波器原型,因为该模型具有复杂的内部几何结构。此外,选择性激光熔化具有单片近净形状制造,消除装配,提高可靠性和减轻重量的优点。实测结果与仿真结果吻合较好。
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来源期刊
Iet Microwaves Antennas & Propagation
Iet Microwaves Antennas & Propagation 工程技术-电信学
CiteScore
4.30
自引率
5.90%
发文量
109
审稿时长
7 months
期刊介绍: Topics include, but are not limited to: Microwave circuits including RF, microwave and millimetre-wave amplifiers, oscillators, switches, mixers and other components implemented in monolithic, hybrid, multi-chip module and other technologies. Papers on passive components may describe transmission-line and waveguide components, including filters, multiplexers, resonators, ferrite and garnet devices. For applications, papers can describe microwave sub-systems for use in communications, radar, aerospace, instrumentation, industrial and medical applications. Microwave linear and non-linear measurement techniques. Antenna topics including designed and prototyped antennas for operation at all frequencies; multiband antennas, antenna measurement techniques and systems, antenna analysis and design, aperture antenna arrays, adaptive antennas, printed and wire antennas, microstrip, reconfigurable, conformal and integrated antennas. Computational electromagnetics and synthesis of antenna structures including phased arrays and antenna design algorithms. Radiowave propagation at all frequencies and environments. Current Special Issue. Call for papers: Metrology for 5G Technologies - https://digital-library.theiet.org/files/IET_MAP_CFP_M5GT_SI2.pdf
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