Design of compact rectangular SIW-based cavity-backed slot antennas for WiMAX communication in Asia-Pacific regions

In this paper, a rectangular cavity-backed substrate integrated waveguide antenna is designed and fabricated at 3.3 GHz in WiMAX IEEE 802.16 band to be used with other electronic devices in Asia-Pacific regions. Three different types of slots are inserted in the ground plane for radiation purpose. The first antenna with 'I' and inverted TY-shaped slots produces a gain of 1.8 dBi at the dominant TE101 mode. The second antenna with 'L'-shaped slot produces a gain of 2.2 dBi, while the third antenna with 'A' -shaped slot produces a gain of 1.9 dBi. Parametric studies are carried out to achieve best antenna performance in terms of both return loss and gain. Detail performance analysis is performed for different shapes of antenna slots, and a comparative study of the proposed antenna is conducted with the existing reported ones. Simulations are done using ANSYS make HFSS v15.0. The antennas are fabricated using FR4 epoxy material, and the parameters are experimentally measured. The simulated and measured results are compared and reflect a close resemblance with each other.