Wideband Directive Self-Complementary Bowtie Antenna for Ka-band

This paper presents a novel wideband directive self-complementary bowtie antenna (SCBA) designed for Ka-band. The proposed antenna is well suited for wireless power transfer and energy harvesting of compact devices using 5G frequencies. The proposed SCBA consists of self-complementary triangular elements and a ground plane, which are added to enhance directivity. The optimized design exhibits a wide impedance bandwidth that covers the entire Ka-band, despite the presence of a ground plane. The proposed SCBA was validated via simulation and measurement. The results demonstrate a bandwidth of 43.8% (25.8–40.1 GHz) and a maximum gain of 10.4 dBi at 29.5 GHz with a compact antenna size of 9.2 mm × 8.7 mm.