Abstract This article presents a novel wideband (WB) tilted-beam end-fire planar antenna for microwave and millimeter-wave (mmWave) applications. The antenna comprises of a microstrip fed double semi-circular rings over a curvilinear slotted ground plane. It is impedance matched over a broad frequency range from 11. 5 to 62. 5 GHz, covering the 5G New Radio (NR) mmWave bands n257, n258, n260, n261, and partly covering the unlicensed 60 GHz band. Across this entire band, the antenna exhibits a return loss better than 12 dB and a gain exceeding 6. 5 dBi, with a peak gain of 11. 6 dBi at 40 GHz. The overall electrical size of the antenna is 1. 28 1 0. 08 ₀³, where ₀ corresponds to the free-space wavelength at 32 GHz. Within the 24–40 GHz frequency range, corresponding to a 50% fractional bandwidth and covering the four 5G NR bands, end-fire radiation is achieved with a tilted beam angle of 65^ ± 10^. A prototype of the antenna is fabricated and experimentally characterized. The measured results show good agreement with full-wave simulations, validating the proposed design. Owing to its compact planar geometry, wide bandwidth, and high gain, the antenna is a strong candidate for future high-data-rate wireless communication systems.
Patel et al. (Sat,) studied this question.