Low-Profile Magneto-Electric Dipole Antenna

Abstract

A novel low-profile magneto-electric dipole antenna is proposed and investigated. The antenna utilizes an obtuse-triangular structure to work as a magnetic dipole, which reduces the antenna thickness to ${0.097 {\lambda}_0}$ (where ${{\lambda }_0}$ is the free-space wavelength at the center frequency). A prototype with ground plane size of around $1{{\lambda }_0} \times 1{{\lambda }_0}$ is fabricated and measured. Measurement result shows that the proposed design achieves an impedance bandwidth of 28.2% (1.67–2.22 GHz) for ${{\rm SWR} . A stable gain of $9.2 \pm 1.1 \hbox{dBi}$ is realized. The antenna has a unidirectional radiation pattern with low cross polarization ( $ ) and low back-radiation level ( $ ) across the operating frequency band.