Abstract

Millimetre wave (mm-wave) antenna arrays with high gain are explored to meet the user requirements of high throughput, with a very close distance between the antenna elements, which enables miniaturisation. However, high-gain antenna array design at mm-wave bands has been a growing concern among antenna engineers because of the inevitable, undesired mutual coupling between the antenna elements. First, various decoupling techniques are explored to increase isolation between patch and ME-dipole antenna arrays at 30 and 60 GHz. Then, a novel
customized π-shaped split-ring resonator (SRR) metasurface is designed. The SRR is arranged in two configurations to decouple 1×2 and 1×4 millimeter-wave (mm-wave) magneto-electric dipole (ME-dipole) in the H-plane. The antenna performances are verified. Third, an effective method is used to design a large dual-polarized finite planar array and its corporate feed network. The procedure is verified by an 8×8 and 16×16 array of metallic ME dipoles fed by a network of
Microstrip Ridge Gap Waveguide (MRGW). The procedure is based on designing the corporate feeding network by replacing the elements’ ports with each element’s corresponding effective input impedance that accounts for the mutual coupling between the antenna elements. The results are verified by the full-wave numerical solution. A 10×10 array is fabricated and measured. The array bandwidth is similar to the element bandwidth. The simulated results are confirmed by measurements. Finally, the same technique is used to design a dual circularly
polarized metallic magnetoelectric dipole with excellent radiation characteristics. Different scenarios are explored, and the antenna is fabricated to confirm the simulated results. The single-layer, single-slot design is also introduced to save the cost of fabricating dual slots. The two-layer feeding network is introduced to solve the problem of extra gaps introduced by the feeding network. The performances
are compared with the single-layer excitation.