Dual Bands Microstrip Substrate Integrated Waveguide (SIW) Antenna for K-band Applications

Abstract

A dual bands circular slot based on a substrate integrated waveguide (SIW) antenna is presented in this paper for K-band
applications. The proposed antenna structure is consisting of a microstrip antenna with two circular-shape slots etched on the top of
radiation plane and located one on top of the other for bandwidth enhancement. This antenna has been printed on an FR-4 substrate
with a dielectric constant 4.3 of and thickness of 1.5 mm. The optimized antenna resonates at 22.45 GHZ and 25GHZ with a fractional
bandwidth of 1.20 GHZ about (5.353 %) and 1.50 GHZ about (5.994 %), respectively. The achieved peak gain is about 6.14 dB and
4.72 dB over the operating frequencies, respectively, this makes it suitable for K applications with good matching and return loss
characteristics. Design model and performance evaluation of a proposed antenna has been executed by EM simulator, CST
Microwave Studio.