volume | PIER Journals

Abstract

In this paper, a highly compact half mode substrate integrated waveguide (HMSIW)-based self-quadplexing antenna is proposed, employing four quarter-mode SIW (QMSIW) radiating elements integrated with longitudinal slots. The antenna operates at four closely spaced resonant frequencies 3.68 GHz, 3.83 GHz, 4.04 GHz, and 4.17 GHz achieved by precisely tuning the slot dimensions. A minimum port isolation of 26 dB is maintained between any two ports, ensuring minimal mutual coupling. The proposed design exhibits a compact footprint of only 0.05λ₀², where λ₀ is the free-space wavelength at the lowest resonant frequency. The simulated and measured gains exceed 5.5 dBi across all four bands, with a radiation efficiency of approximately 85%. Owing to its compact size, high isolation, and efficient radiation performance, the proposed antenna is well-suited for the upper S-band (3.1-3.9 GHz) and lower C-band (4.0-4.2 GHz) which are widely allocated for fixed-satellite service (FSS) communications applications.

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Dr. Shaik Mahaboob Subani

Dr. Satya Nagakishore Bhavanam

Dr. Vasujadevi Midasala

Dr. Mallarapu Gopi Krishna