An Ultra-Wideband and High-Efficiency 90° Polarization Rotator Based on Double Split-Ring Resonators

摘要

An ultra-wideband three-layer 90° polarization rotator based on double split-ring resonators is proposed in this paper. The structure is constructed from three layers separated by two air gaps. The top and bottom layers are wire grid orthogonal to each other, while the middle layer consists of double split-ring resonators. The purposed polarization rotator is able to rotate the incident linearly polarized plane wave in the frequency band from 3.70 to 14.76 GHz with a minimum of 90% cross-polarization transmission. Compared to previous works based on single split-ring resonator, our improved design exhibits a fractional bandwidth of 119.8%, which is wider than the reported design by 27.2%.