Abstract
A novel low-profile substrate integrated waveguide (SIW) cavity-backed slot antenna with an enhanced gain is proposed. By etching four parallel transverse slots at the edges of the hexagonal SIW cavity as the radiating elements, higher resonance mode of quasi-TM310 can be excited to achieve gain enhancement. A fabricated prototype with a size of 1.3 λ 0 × 1.3 λ 0 × 0.025 λ 0 has been measured. Results show that the proposed design achieves a 10-dB impedance matching bandwidth of 195 MHz and a maximum boresight gain of 10.74 dBi. The proposed antenna exhibits a high front-to-back ratio and low cross-polarisation level. It still retains the advantages of low cost, ease of fabrication, and easy integration with planar circuits, making it a good candidate for low-cost mass-production.
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