A Broadband Magneto-Electric Dipole Antenna With Stable Broadside Radiation Performance

This letter introduces a broadband magneto-electric dipole antenna with a stable broadside radiation pattern. The proposed antenna incorporates rectangular parasitic elements and grooves on the arc-shaped radiating patch, which introduce a current cancellation mechanism. This mechanism ensures that the main radiation pattern remains highly consistent across the operating band, thereby guaranteeing radiation pattern stability over the entire frequency range. Furthermore, in combination with the metal bracket, the design enables orthogonal superposition of the electric and magnetic current distributions, contributing to broadside radiation pattern. The antenna features a compact aperture size of 0.4λ0× 0.4λ0× 0.1λ0. Within the operating band, the radiation efficiency exceeds 85%. Both simulated and measured results demonstrate an impedance bandwidth (IBW) of 77% (0.4–0.9 GHz), a peak gain of 5.07 dBi with a variation of only 0.37dBi, and an E-plane half-power beamwidth (HPBW) ranging from 92° to 123°.