A novel design of modified I-shaped low profile broadband cavity-backed SIW slot antenna

Abstract

This article proposes a novel procedure to enhance the bandwidth of substrate-integrated waveguide (SIW) slotted antennas. By introducing a rectangular slot on the cavity's bottom surface, the TE₂₁₀ cavity mode is perturbed, leading to the successful generation and merging of odd and even TE₂₁₀ modes. This approach achieves an impedance bandwidth of 13.5%. To further enhance the bandwidth, the rectangular slot is modified into an I-shaped slot by adding vertical slits at each end, increasing the impedance bandwidth to 15.1%. Placing the modified I-shaped slot on the ground plane further enhances the impedance bandwidth to 17.2%. The constructed antenna maintains a gain of 7.83 dBi at 10.2 GHz and 7.85 dBi at 11.4 GHz, with a measured impedance bandwidth of 19.04%. The design retains several advantageous features, including lightweight construction, easy fabrication, and seamless integration.

KEYWORDS:

• Rectangular cavity-backed slot antenna
• modes investigation
• Broadband and Substrate Integrated Waveguide (SIW)

Disclosure statement

No potential conflict of interest was reported by the author(s).