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

Article type: Research Article

Authors: Ho, Min-Hua^a | Hsu, Chung-I G.^b; | Hung, Jhuo-Ting^b | Shen, You-Lin^a

Affiliations: [a] Graduate Institute of Communications Engineering, National Changhua University of Education, Changhua, Taiwan, ROC | [b] Department of Electrical Engineering, National Yunlin University of Science and Technology, Douliou, Yunlin, Taiwan, ROC

Correspondence: [*] Corresponding author: Chung-I G. Hsu, 123 University Rd. Section 3, Douliou, Yunlin, Taiwan 64002, ROC. Tel.: +886 5 5524600; Fax: +886 5 5312065; E-mail: [email protected]

Abstract: 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.

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

DOI: 10.3233/JAE-210114

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 68, no. 2, pp. 263-273, 2022