Magneto-Electric Dipole Antenna Loaded with Meta-Lens for Beamforming and Dual-Beam Radiation Applications

This paper presents a wideband beamforming double-fed magneto-electric (ME) dipole antenna fed by a printed ridge gap waveguide (PRGW) operating at millimeter wave bands. An ME-dipole antenna is designed as a quasi TE source to achieve a wide bandwidth of 40% (24–36 GHz) with a maximum realized gain of 10.8 dBi at 30 GHz. To deflect the beam in the E-plane, three layers of split-ring resonators (SRR), each with an array of
$5\times 10$
unit-cells, are located horizontally and offset from the center of the double ME-dipole antenna. The SRR operates as a meta-lens and offers a low permeability over a broad bandwidth in the Ka-band. The proposed structure provides beamforming with dynamic range from −25° to +25° and a dual-beam at ±25° over the operating bandwidth, while providing a maximum gain of 13.4 dBi at 32 GHz and maintaining the impedance bandwidth of the unloaded antenna.