Metasurface-Covered Planar Endfire Antenna With Vertical Polarization

A trapped wave-based solution to design compact planar vertically polarized (VP) endfire antennas is proposed in this communication. By placing a four-element series-fed magnetic dipole array with an interspacing of half wavelength within a dual-layer metasurface and loading shorting pin arrays at two edges of the metasurface, the VP radiation is realized in a wide impedance band. In addition, the antenna profile can be further reduced by half according to the electric field distribution within the metasurface. Finally, a VP endfire antenna with a reflection bandwidth of 4.3–5.4 GHz, a peak gain of 9.8 dBi, and a low total profile of
$0.065\lambda_{0}$
(
$\lambda_{0}$
is the free-space wavelength at the center operation frequency) is designed for the validation. The proposed antenna can be used for some wireless communication systems on or near the ground plane, such as the car roof-mounted terminal for vehicle-to-road side unit/base station communication.