Analyze and Design of Thin Planar High Impedance Surface as an Antenna

In this paper, an extremely thin planar antenna comprising only a high impedance surface (HIS) layer as the main radiator has been proposed. By eliminating the need of the dipole on top of the HIS, the proposed structure is formed with an extremely thin grounded dielectric layer covered by a patterned sheet of dogbone-shaped metal patches. This HIS antenna has been designed and optimized on a thin substrate with a thickness of 1/100 of the wavelength at the operating frequency, 900 MHz. The proposed antenna is constructed from a 6 × 6 unit-cells where the performance is being analyzed and compared with an array of 2 × 2 rectangular patches designed to operate at the same frequency band. Despite the very thin substrate, the antenna radiates with a broadside gain of 13 dBi and a gain-bandwidth of 23.14 %.