Design and fabrication of a TE50 mode SIW-fed Yagi antenna array at 5.8 GHz

Abstract

The proposed approach introduces an innovative feeding mechanism enabling efficient directive radiation with a planar antenna array. A microstrip T-type power divider is employed for initial power distribution, while two symmetrically placed slots are utilized to achieve direct mode conversion into the higher-order TE 50 mode within the SIW structure. A prototype was fabricated to validate the concept experimentally. The measured results demonstrate excellent agreement with simulations, confirming a fractional impedance bandwidth of 3.4% (5.70–5.90 GHz for S 11 < − 10 dB) and a peak realized gain of 10.2 dBi at 5.8 GHz, with a measured radiation efficiency of 87.2%. This design offers significant advantages, including simplified fabrication, reduced production costs, and enhanced tolerance to manufacturing variations, making it well-suited for communication systems at 5.8 GHz requiring directive radiation.