Development of A Compact and Low Profile ‎Cavity Backed Slot Antenna Using Microstrip ‎Gap Waveguide Technology

Document Type: Research Paper


1 Department of Electrical and Computer Engineering, Graduate University of Advanced Technology, Kerman, ‎Iran

2 Department of electrical and computer engineering, Graduate university of advanced technology, Kerman, Iran


Proof of concept of a cavity backed slot antenna based on inverted microstrip gap ‎waveguide (IMGW) technology is presented. Since the antenna is operating based on the ‎first resonating mode of the cavity, it is more compact compared to the ordinary cavity ‎backed slot antennas in which the second cavity mode is used for radiation. Furthermore, ‎the proposed antenna element introduces lower losses compared to a microstrip patch ‎thanks to the surface wave suppression and lower dielectric loss of the air filled IMGW ‎cavity. A sample antenna is designed and fabricated to operate at 9.6GHz and quite good ‎agreement between simulation and measurement results is observed.‎