volume | PIER Journals

Abstract

In this paper, a novel wideband coaxial-to-rectangular waveguide transition integrated with a septum horn antenna is proposed for C-band satellite communication applications. The design employs a modified supershape excitation probe, derived from an extended superformula, to achieve smooth impedance transformation and broadband performance. Initially, the probe geometry is optimized through parametric simulations to validate its effectiveness within a rectangular waveguide structure. The transition is then effectively incorporated into a stepped septum horn antenna that facilitates dual circular polarization through a compact dual-feed mechanism. The septum structure ensures efficient conversion of linearly polarized modes into left-hand and right-hand circularly polarized waves, while maintaining high isolation and low axial ratio. An equivalent circuit model is developed to provide analytical insight into the impedance behavior. A prototype antenna is fabricated, and its performance is validated through measurements. The measured results confirm reflection coefficients below -10 dB across 4.6-8.6 GHz, peak gain of 15.8 dBi, and inter-port isolation exceeding 20 dB. Furthermore, the antenna achieves a 3 dB axial ratio bandwidth of 76.9%. A comparison with state-of-the-art designs demonstrates the superior performance and design efficiency of the proposed antenna architecture.

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Mr. Ajitesh

Dr. Manoj Kumar Meshram