A Broadband Linearly Polarized Magneto-Electric Dipole Antenna with Microstrip Slot-Coupled Feed

Abstract

This paper presents a broadband linearly polarized magneto-electric dipole antenna (MEDA) fed by a microstrip line through an aperture-coupled slot. This antenna abandons the traditional rectangular electric dipole patch and Γ-shaped probe feed; instead, the proposed design utilizes a trapezoidal electric dipole plate with arc-shaped slots and a vertical magnetic dipole plate to form the radiating structure. The antenna is excited by a microstrip feedline and a rectangular coupling aperture etched on the substrate. This feeding structure effectively improves the impedance matching and radiation characteristics, thereby significantly enhancing the overall antenna performance. Simulation results indicate that the antenna's impedance bandwidth (≤-10 dB) reaches 82.6% (2.89-6.96 GHz), with a maximum in-band gain of 9.49 dBi and a cross-polarization level below -30 dB.