Compact substrate integrated waveguide mono-pulse antenna array

Abstract

A compact monopulse antenna array based on substrate integrated waveguide technology is presented through this article. The design is fabricated on Printed Circuit Board (PCB) technology consisting of a double-layered 8-cell array antenna with a slot in the middle-ground metal used for aperture-coupling excitation and reducing unwanted spurious emissions from feed network. The Impedance bandwidth and AR bandwidth are enhanced due to optimal feed network, including Rat-Race coupler to generate sum and difference patterns for mono-pulse applications operating at 10 GHz. The prototype of the proposed antenna with the size of 124*25 mm² is fabricated and tested. Measured results compared very well to simulation results obtained by CST microwave studio and show −10-dB impedance bandwidth of 4% and −22 dB null-depth in difference mode.