Vol. 76

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Planar Cavity-Backed Self-Diplexing Antenna Using Two-Layered Structure

By Arvind Kumar and Singaravelu Raghavan
Progress In Electromagnetics Research Letters, Vol. 76, 91-96, 2018


A design of a half-mode substrate integrated waveguide (HMSIW) cavity-backed self-diplexing antenna is proposed with a two-layer structure. The top layer comprises two HMSIW based cavities, and radiating patches are etched on the top-cladding of each cavity. The radiating patches are excited by two distinct printed microstrip lines on the backside of the bottom layer by using shorting-pins. The shorting-pin excites the corresponding cavity in its dominant mode, which resonates at two different frequencies in X-band. The simulated results demonstrate that the proposed design resonates at 8.20 GHz and 10.55 GHz with an isolation of higher than -25 dB between two excitations, which helps to introduce the self-diplexing phenomenon. Also, both resonant frequencies can be tuned independently by varying the dimensions of the corresponding cavity. Moreover, HMSIW cavity-backed structure and proposed feeding technique reduce the overall size of the antenna significantly, while it maintains high gain and unidirectional radiation characteristics for both operating frequencies.


Arvind Kumar and Singaravelu Raghavan, "Planar Cavity-Backed Self-Diplexing Antenna Using Two-Layered Structure," Progress In Electromagnetics Research Letters, Vol. 76, 91-96, 2018.


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