Browsing by Author "Pradhan, Nrusingha Charan"

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    Design of Miniaturized SIW Filter Loaded with Open-Loop Resonators and its Application to Diplexer
    (Czech Technical University, 2020-09-01) Barik, Rusan Kumar; Cheng, Qingsha S.; Pradhan, Nrusingha Charan; Karthikeyan, Sholampettai Submaranian
    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.
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    Miniaturized Dual-Band SIW-Based Bandpass Filters Using Open-Loop Ring Resonators
    (Multidisciplinary Digital Publishing Institute (MDPI), 2023-09-21) Pradhan, Nrusingha Charan; Koziel, Slawomir; Barik, Rusan Kumar; Pietrenko-Dabrowska, Anna; Karthikeyan, Sholampettai Subramanian
    This article presents two novel architectures of dual-band substrate-integrated waveguide (SIW) bandpass filters (BPFs). Initially, two identical open-loop ring resonators (OLRRs) were coupled face-to-face on the top of the SIW cavity to realize a dual-band single-pole BPF. To obtain two-pole dual-band characteristics, two OLRRs resonant units were assembled horizontally within the top metal layer of the SIW, which is a technique used for the first time in the literature. For demonstration purposes, two types of SIW filters loaded with OLRRs were designed and fabricated. The proposed filters feature an extremely compact size, a low insertion loss, and good selectivity. The single- and two-pole filters have an overall size of 0.012 (Formula presented.) (Formula presented.) and 0.041 (Formula presented.) (Formula presented.), respectively. The simulated and measured circuit responses are in good agreement.