A Dual-Band Polarization-Rotation Transmitarray With Independent Phase Control and Frequency Selectivity Characteristics

In this letter, a dual-band dual-polarization transmitarray (TA) with independent phase control is proposed. The polarization rotation is achieved by changing the relative displacement of the unit cell feed points, and then the symmetric 1-bit unit cells are designed for realizing independent 1-bit phase resolution in two distinct frequency bands. For validating the design idea, a dual-band TA prototype is fabricated, whose measurements show high-frequency selectivity characteristics. It can achieve controllable collimation beam directions at two different frequency bands of 6 and 8 GHz, with maximum gains of 25.94 dBi and 28.57 dBi, and 3 dB gain bandwidths of 10.75% and 6.37%, respectively. The measured results are in reasonable agreement with full-wave simulated results.