Wideband substrate integrated waveguide cavity‐backed spiral‐shaped patch antenna

A new technique for designing wideband substrate integrated waveguide (SIW) cavity-backed antenna is presented in this article. The antenna element is composed of a spiral-shaped patch and an SIW cavity fed by a coaxial probe. It takes advantage of a dual-resonance observed in the proposed spiral-shaped patch structure to enhance its bandwidth. A 2 × 1 array is designed to increase the antenna gain. To demonstrate the validity of the bandwidth enhancement technique, prototypes of the proposed antenna element and array for X-band applications are fabricated and measured. The measure 10-dB return loss bandwidth of the antenna element is 11.2% (10.306–11.531 GHz) while that of the array is 12.5% (10.292–11.66 GHz). © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:332–337, 2015

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