Novel frequency selective surface-loaded dual-polarized ultra-wideband tightly coupled array antenna

To achieve better electromagnetic characteristics and more stable radiation properties within an ultra-wide band, a novel dual-polarized ultra-wideband tightly coupled array antenna loaded with wide-angle impedance matching layer on a strip frequency selective surface was proposed. The array elements were studied and analyzed through the truncation by the periodic boundary conditions in high frequency electromagnetic simulation software CST. After investigating its electromagnetic properties of array impedance and radiation, a 6 × 6 array antenna was designed, manufactured for actual measurement. The measurement results show that the standing wave ratio of the antenna in the frequency band of 2~12 GHz is less than 3. The impedance bandwidth is 10 GHz. Moreover, the antenna has stable radiation within frequency band, more electromagnetic energy is concentrated in the mainlobe, and the cross polarization is small. In the operating frequency band, the maximum gain can reach 13 dBi. This kind of array antennas can be applied in the ultra-wideband phased array domain.