*Article* **Dual-Band Transmissive Cross-Polarization Converter with Extremely High Polarization Conversion Ratio Using Transmitarray**

#### **Jianxing Li 1, Jialin Feng 1, Bo Li 2, Hongyu Shi 1, Anxue Zhang 1 and Juan Chen 1,3,4,\***


Received: 27 April 2019; Accepted: 3 June 2019; Published: 5 June 2019

**Abstract:** In this paper, a dual-band cross-polarization converter is proposed. The proposed device can convert linearly polarized incident waves to their cross-polarized transmitted waves. Inspired by the aperture coupled transmitarray, a transmissive multi-layered unit cell structure was designed, which can operate in two frequency bands. The designed structure can manipulate the polarization of the transmitted wave into the cross-polarization of the incident waves at 10.36 GHz and 11.62 GHz. The cross-polarized transmittance of the proposed cross-polarization converter is higher than 0.93. In addition, the transmitted wave has an extremely low co-polarized component, which results in a nearly 100% polarization conversion ratio. The two working frequencies can be tuned independently. The proposed cross-polarization converter was simulated, fabricated and measured. The simulation results confirm with the measurement results.

**Keywords:** cross-polarization converter; transmitarray; high polarization conversion ratio
