Dual Polarized Planar Array of Metallic Magnetoelectric Dipoles

A more effective method of designing a large finite array using a metallic magnetoelectric (ME-dipole) element is proposed. The extracted mutual admittance matrix of a small array is extrapolated to predict the mutual admittance matrix and input impedance of a large array, including the mutual coupling effect. This information is used to design a frequencydependent feed network of a 4 × 4 dual-polarized metallic MEdipole antenna. The ME-dipole used is air-filled, without a dielectric substrate, to improve the total efficiency. Also, the 4 × 4 metallic ME-dipole element array used is designed to exhibit 26 - 41(44.7 %) GHz ultra-wide impedance bandwidth without a cavity, unlike other air-filled ME-dipole, 26 dBi peak gain and 90 % total efficiency. The 4 × 4 antenna array exhibits less than 40 dB isolation between the two polarizations, within the working bandwidth, without needing any external decoupling mechanism.