Design and Analysis of a Bandwidth Enhanced Low-profile SIW Cavity-backed Slot Antenna Using TE₂₁₀ Mode

Abstract

In this paper, a bandwidth improvement technique in SIW slotted antennas is presented. Distinct from conventional SIW antennas with multiple cavity modes, a single cavity mode (TE 210 ) is utilized to improve the bandwidth. When a rectangle slot is loaded at bottom surface of the cavity, the TE 210 cavity mode is perturbed. As a result, two independent modes (odd TE 210 , even TE 210 ) are introduced and merged in close proximity. Finally, the antenna is fabricated and tested. The measured results render an impedance bandwidth of 12.8% and a maximum gain of 7.1 dBi. The cross-polar level of maximum −29 dB and −34 dB is at 9.73 GHz and 10.63 GHz, respectively. The proposed design holds many features such as easy fabrication and light weight. Besides, the proposed design is single-layered that makes it extremely convenient to integrate with other planar configurations.