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首页> 外文期刊>Journal of Ceramic Science and Technology >Small-Size Low-Loss Bandpass Filters on Substrate-Integrated Waveguide Capacitively Loaded Cavities Embedded in Low Temperature Co-Fired Ceramics
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Small-Size Low-Loss Bandpass Filters on Substrate-Integrated Waveguide Capacitively Loaded Cavities Embedded in Low Temperature Co-Fired Ceramics

机译：基材集成波导的小型低损耗带通滤波器电容负载腔内嵌入低温共用陶瓷

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摘要

The design of microwave filters for portable electronics is complicated by conflicting requirements that must be met simultaneously such as high selectivity, low insertion loss and compact size. Substrate-integrated waveguide (SIW) technology allows the design of low-profile high-Q resonators and low-loss filters based on this. However, SIW filters are not well suited for telecommunication applications because of their remarkably large size in plane. The size of a SIW cavity can be dramatically reduced with the use of capacitive loading. Capacitively loaded cavities (CLCs) operating in the TMlio mode are shown to be as small as 1/8 of the guided wavelength and even smaller, i.e. comparable in size with lumped-element resonators. Although the unloaded Q-factor decreases proportionally to cavity size, miniaturized CLCs can exhibit a much higher Q-factor than that of lumped-element resonators. This paves the way for designing small-size and low-loss filters for wireless communications and different applications. Miniaturized capacitively loaded SIW cavities are favorably implemented by means of low-temperature co-fired ceramics (LTCC) technology. The goal of the paper is to demonstrate the manifold possibilities and flexibility offered by LTCC technology for the design of advanced microwave filters on CLCs. Different design and manufacturing aspects are considered. Various design examples of high-performance LTCC resonators and filters for single- and dual-band wireless applications are presented. The designed resonators and filters were manufactured using the commercial DuPont Green Tape 951 LTCC system. The LTCC filters on miniaturized CLCs are shown to be advantageous with regard to small size, low loss, and absence of spurious response over a wide frequency range.
机译：用于便携式电子器件的微波过滤器的设计通过相互满足的要求，如高选择性，低插入损耗和紧凑尺寸，必须相互满足。基材集成波导（SIW）技术允许基于此设计低调的高Q谐振器和低损耗滤波器。然而，由于飞机上的大尺寸非常大，因此SIW过滤器并不适用于电信应用。通过使用电容负载，可以显着减小SiW腔的尺寸。在TMLIO模式下操作的电容负载腔（CLCS）被示出为引导波长的1/8，甚至更小，即尺寸与大块元件谐振器相当。虽然卸载的Q因子与腔尺寸成比例地减小，但小型化的CLC可以表现出比集小元件谐振器更高的Q系数。这为设计用于无线通信和不同应用的小型和低损耗过滤器来铺平道路。通过低温共烧陶瓷（LTCC）技术有利地实现了小型化电容负载的SIW腔。本文的目标是展示LTCC技术提供的歧管可能性和灵活性，为CLCS上的先进微波滤波器设计。考虑不同的设计和制造方面。提出了高性能LTCC谐振器和用于单频段无线应用的滤波器的各种设计示例。设计的谐振器和过滤器是使用商业杜邦绿色胶带951 LTCC系统制造的。小型化CLC上的LTCC滤波器在宽频率范围内的小尺寸，低损耗和虚假响应的情况下，是有利的。

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