A Triple-layer Wideband Transmitarray Antenna Using Finger-Type Slot Elements

A novel triple-layer wideband transmitarray antenna using finger-type slot elements is presented in this paper. The unit-cell contains five longitudinal slots and a transverse slot on every thin metal layer, the simulated transmission coefficients of the unit-cell indicate that low loss and wideband properties are achieved at Ku-band. A wideband TA with diameter of 7.1 wavelengths using the proposed unit-cell is designed and simulated by commercial software Ansys 18.0. Simulated gain of 21.2 dBi at the center working frequency of 13.58 GHz and -1 dB gain bandwidth of 24.3% are achieved at Ku band. The simulated radiation patterns of TA show that low side lobe level and low cross polarization level are reached in broadband range.