Dual-Band Cavity-Backed Dumbbell-Shaped Slot Antenna

Abstract

In this paper, a novel dumbbell-shaped slot alongwith thin substrate integrated waveguide (SIW) cavity backingis used to design dual-band slot antenna. The design in thispaper has unidirectional radiation pattern, high gain, high(FTBR) at each resonant frequency while having low profile, planar configuration. The unique slot shape creates complexcurrent distribution at different frequencies that results insimultaneous excitation of hybrid mode at higher frequencyalong with conventional mode in the cavity. Bothconventional mode and the hybrid mode helps themodified slot to radiate at the corresponding resonantfrequencies resulting in compact, dual-band antenna. Thisdesigned antenna resonates at 7.1 GHz and 11.5 GHz withgain of 6.7 dB and 5.8 dB respectively. The FTBR of theantenna are above 10 dB at both operating frequencies.