A Millimeter-Wave Low-Profile and Metal-Only Transmitarray Antennas at 28 GHz

A novel high-gain and low-profile transmitarray antenna, operating at 28 GHz, is presented in this paper. A four-layer metal-only element is used to achieve a full transmission phase range of 360° for a transmission magnitude equal to or better than −1.2 dB. A transmitarray with a main beam at the broadside direction is simulated via CST software. The simulation results show that the designed antenna with an aperture size of 95.25 cm
²
at 28 GHz, has 26 dBi maximum gain. In addition, the proposed transmitarray antenna achieves a 17.3% 1-dB gain bandwidth and 38.2% efficiency.