Affiliations: [a] Department of ECE, DIT University, Dehradun, India | [b] Department of ECE, Koneru Lakshmaiah Education Foundation, Vadddeswaram, Andhra-Pradesh, India | [c] Centre for Reliability Sciences & Technology, Chang Gung University, Taoyuan, Taiwan
Correspondence:
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Corresponding author: Padmini Nigam, Department of ECE, DIT University, Dehradun, India. E-mail: padmini.nigam@dituniversity.edu.in
Abstract: In this letter, an efficient and electrically compact cavity-backed self-triplexing antenna using a substrate integrated waveguide (SIW) technique is proposed. The antenna model is nested with an inverted “T”-shaped cavity and convert the rectangular SIW cavity into the two quarter mode (QM) and a half mode cavity (HM) approximately; excited through a coax probe and two micro-strip feed line separately. The proposed model operates at three distinct frequencies at 9.37 GHz, 9.86 GHz, and 10.36 GHz used for X-band wireless and radar communication systems. The self-triplexing feature is obtained with the mode perturbation concept and adequate intrinsic isolation of >31 dB is observed among three input ports. The proposed antenna possesses a minimum frequency ratio, uni-directional radiation patterns with high gain, and better efficiency.
Keywords: Substrate integrated waveguide (SIW), isolation, self-triplexer, quarter-mode (QM), gain
