Artificial Magnetic Material for Array Antenna Application

Artificial magnetic material (AMM) has attracted enormous interests as it provides high permeability in the microwave region which is not achievable in current natural magnetic materials. In this paper, we have investigated one three-dimensional artificial magnetic material (AMM) based on the octagonal spiral resonator. This AMM can achieve the same high effective permittivity and permeability of 4.85 at 1.014 GHz. By using this AMM substrate, the miniaturized patch array antenna has been realized with a stable radiation pattern and low reflection ( $\mathrm{S}_{11} ) at the working frequency according to the CST simulation. Moreover, the dipole array antenna based on magnetic material has also been simulated. The simulated results validate that the magnetic substrate can be applied to reduce the scan blindness effect in an array antenna for reaching wide scanning range.