A Self-Diplexing Multi-Mode SIW Cavity-Backed Antenna with a Lambda (λ)-Shaped Slot for X- and Ku-Band Applications.

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Bibliographic Details
Title:	A Self-Diplexing Multi-Mode SIW Cavity-Backed Antenna with a Lambda (λ)-Shaped Slot for X- and Ku-Band Applications.
Authors:	Asaithambi, Ravindiran¹ ravigce2002@gmail.com, Prabakaran, Maruthamuthu P.², Rajesh, Govindasamy³
Source:	Progress in Electromagnetics Research C. 2026, Vol. 165, p257-266. 10p.
Subjects:	Substrate integrated waveguides, Multifrequency antennas, Antennas (Electronics)
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. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
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. [ABSTRACT FROM AUTHOR]
ISSN:	19378718
DOI:	10.2528/PIERC25111707