Design of Miniaturized SIW Filter Loaded with Open-Loop Resonators and Its Application to Diplexer

R. K. Barik, Q. S. Cheng, N. C. Pradhan, S. S. Karthikeyan

Design of Miniaturized SIW Filter Loaded with Open-Loop Resonators and Its Application to Diplexer

Číslo: 4/2020
Periodikum: Radioengineering Journal
DOI: 10.13164/re.2020.0609

Klíčová slova: SIW, filter, diplexer, open-loop resonators

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Anotace: This paper presents a novel design of miniaturized substrate-integrated waveguide (SIW) filter loaded with a pair of unit-cell resonators. Two identical open-loop resonators are connected face-to-face to form a unit-cell. A pair of unit-cells is engraved on the surface of the SIW to develop an evanescent-mode bandpass filter. The proposed unit-cells behave as an electric-dipole and produce a passband smaller than the waveguide frequency. This reduction in resonant frequency allows us to achieve size miniaturization. An equivalent electrical-circuit model is developed and investigate for characterization of passband and transmission-zero. This filter structure is then employed to develop a SIW planar diplexer. Two SIW filter structures loaded with unit-cells are excited with a T-shaped feed line to achieve lower and upper channels of the diplexer. To demonstrate the analysis, both SIW filter and diplexer loaded with open-loop resonators are implemented and fabricated. The proposed SIW filter and diplexer prototypes exhibit size miniaturization, low insertion-loss and high-selectivity due to evanescent-mode transmission and sub-wavelength resonators. The measurement responses are very similar to the simulation responses.