volume | PIER Journals

Abstract

This paper presents a self-diplexing, multi-mode substrate-integrated waveguide (SIW) antenna based on a cavity-backed SIW configuration. The antenna employs a λ-shaped radiating slot that provides inherent filtering characteristics. The proposed architecture achieved independent dual-band control through two diagonally oriented slots arranged at 45°, forming a λ-shaped aperture. These slots, integrated within an SIW cavity and excited by two separate 50-Ω microstrip feeds, enable dual resonances at 10.76 GHz and 12.39 GHz, corresponding to the TE₂₁₀ and TE₂₂₀ modes for X-band and Ku-band operation, respectively. Experimental validation confirmed reflection coefficients below -10 dB in both bands, with measured bandwidths of 3.0% (10.61-10.93 GHz) and 3.2% (12.19-12.59 GHz). The proposed filtenna achieves gains of 6.12 dBi and 6.15 dBi and exhibits high port isolation exceeding 28 dB between channels, along with an overall simulated radiation efficiency of 91.16%. In addition, a single-layer structure offers two-band operation, broadside linear polarization, and intrinsic filtering functionality, making it a compact and efficient solution for X/Ku-band applications.

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Mr. Ravindiran Asaithambi

Dr. Maruthamuthu Paramasivam Prabakaran

Dr. Govindasamy Rajesh