Browsing by Author "Karthikeyan, Sholampettai Subramanian"

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    Compact dual-band substrate integrated waveguide crossover with high isolation
    (Electromagnetics Academy, 2019-03-22) Karthikeyan, Sholampettai Subramanian
    —A compact dual-band substrate integrated waveguide (SIW) crossover with high isolation is proposed. Two identical slots are etched on the ground plane to achieve dual-band response and compact size. The passbands are generated below the cutoff frequency of the SIW due to the electric dipole behaviour of the slots. In-line ports are also employed to obtain good transmission and high isolation. To validate the concept, a dual-band crossover operating at 2.4 GHz and 5.4 GHz is designed, fabricated, and measured. The crossover size including in-line ports is 43.2 × 43.2mm2,equivalentto 0.43λg × 0.43λg,hereλg is the guided wavelength at the first operating frequency. The tested insertion loss and isolation at the two operating frequencies are smaller than 0.27 dB and greater than 40 dB, respectively.
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    Compactwideband Siw Based Bandpass Filter For X, Ku And K Band Applications
    (Czech Technical University, 2021-03-23) Duraisamy, Tharani; Kamakshy, Selvajyothi; Karthikeyan, Sholampettai Subramanian; Barik, Rusan Kumar; Cheng, Qingsha S.
    This paper presents a miniaturized bandpass filter (BPF) with characteristics of wider passband and stopband rejection using substrate integrated waveguide (SIW) technology. Slot loading mechanisms deployed on the upper layer of SIW and defective ground structure (DGS) on the ground plane are utilized to achieve wider passband and stopband respectively. The slots on the top layer along with DGS significantly enhances the selectivity of the filter by generating three transmission zeros (TZs) on the upper side of the passband. The proposed filter is simulated using fullwave simulators and the performance is validated through fabrication and testing of the prototype. The proposed SIW filter exhibits a low insertion loss of 1.52 dB over a wider passband from 9.17 GHz to 20.31 GHz with a 3 dB fractional bandwidth (FBW) of 76%. Further, a wider upper stopband is achieved with the rejection of more than 16 dB in the frequency range of 23 GHz to 40 GHz. The filter provides a flat group delay response of approximately 0.19 ns over the wider passband. The electrical size of the fabricated prototype is 1.05λg* 0.67λg, where λgdenotes the guided wavelength in the dielectric substrate for the designed center frequency of 16 GHz.
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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.