4.3 Article

Miniaturized trisection BPF design using size-reduced substrate integrated coaxial resonators

Publisher

IOS PRESS
DOI: 10.3233/JAE-210114

Keywords

Circuit miniaturization; substrate integrated coaxial resonator (SICR); substrate integrated waveguide (SIW) cavity; transmission zero allocation; trisection filter

Funding

  1. Ministry of Science & Technology, R. O. C. [MOST 109-2221-E-018-018, MOST 110-2221-E-018-005]

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This work proposes miniaturized trisection bandpass filters using size-reduced substrate integrated coaxial resonators. These filters have the advantage of an excellent circuit-area efficiency and a freely switchable transmission zero.
The contribution of this work is to propose miniaturized trisection bandpass filters (BPFs) using size-reduced substrate integrated coaxial resonators (SICRs). The applied SICRs are operated under a coaxial mode. The occupied circuit area of the SICR developed from its structurally similar one, the substrate integrated waveguide (SIW) cavity, is only 6.2% that of the latter, corresponding to a circuit-area reduction rate of 93.8%. The cross-coupling between the input and output resonators can be either a magnetic or electric coupling for locating the transmission zero near either the upper or lower passband edge, respectively. Sample trisection BPFs with magnetic/electric cross-couplings are built for experimental verification. Agreements between measured and simulated data are observed. These miniaturized trisection BPFs with a freely switchable transmission zero are endowed with the advantage of an excellent circuit-area efficiency in the category of SICR and SIW cavity trisection BPFs.

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