Development of Dual‐Slot Antenna Array Using Substrate Integrated Waveguide (SIW) Technique

ABSTRACT This study investigates a single‐layer substrate integrated waveguide (SIW) cavity‐backed slot antenna and its 1 × 4 linear array counterpart. The antenna unit comprises an SIW‐based rectangular cavity, dual arc‐shaped slots, and a tapered microstrip feed line. Operating in TE102 mode, the antenna exhibits dual resonant frequencies, spanning from 8.71 to 9.05 GHz, with peaks at 8.8 and 8.98 GHz. Fabricated using conventional printed circuit board (PCB) techniques, the array design is subjected to tests for reflection coefficient, gain, and radiation patterns. The measured results closely match simulations, showcasing operational frequencies from 8.65 to 9.025 GHz, with an average gain of 8.24 dBi. With dimensions of 2.15 × 2.48 × 0.023λ 0 mm, the array offers advantages such as a planar feeding network, compact size, affordability, and ease of fabrication. These attributes position the proposed design as an ideal candidate for X‐band wireless communication transceivers.