Wideband Metasurface-Based Reflective Polarization Converter for Linear-to-Linear and Linear-to-Circular Polarization Conversion

• Published in: IEEE antennas and wireless propagation letters Vol. 17; no. 8; pp. 1459 - 1463
• Main Authors: Zheng, Qi, Guo, Chenjiang, Ding, Jun
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Azimuth; Bandwidths; Broadband; Circular polarization; Conversion; Conversion ratio; Converters; Frequency conversion; Linear polarization; Metasurface; Metasurfaces; Polarization; polarization converter; Reflected waves; Reflection; Resonant frequency; Substrates; Unit cell; Wave reflection; Wideband
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2018.2849352

A wideband reflective polarization converter based on metasurface is proposed in this letter. This converter can transform a linearly polarized (LP) incident electromagnetic (EM) wave into its orthogonal LP reflection wave in a lower band, and a circularly polarized (CP) reflection wave in a higher band. The unit cell of this converter is comprised of two meander lines and one cut wire printed on a dielectric substrate, backed with metallic ground sheet. The simulation results show that the y / x -polarized incident EM wave can be converted to the x/y -polarized reflected wave over a fractional bandwidth of 59.6% from 6.53 to 12.07 GHz with a polarization conversion ratio over 0.88. Besides, the y / x -polarized incident EM wave is converted to a CP reflected wave from 13.70 to 15.60 GHz (a fractional bandwidth of 13.0%). To verify the polarization conversion performance, a sample consisting of 30 × 30 unit cells is fabricated and measured. The experimental and simulation results obtained are in a reasonable agreement, which verifies the properties of the design.