Flexible rotation of linear polarization conversion with a frequency selective surface.

Area of Science:

• Electromagnetics
• Materials Science

Background:

• Polarization converters are crucial for manipulating electromagnetic waves.
• Frequency selective surfaces (FSS) offer unique electromagnetic filtering and manipulation capabilities.

Purpose of the Study:

• To propose and demonstrate a high-efficiency transmitted polarization converter (PC) utilizing a frequency selective surface (FSS).
• To achieve efficient conversion of linearly polarized (LP) electromagnetic waves into other LP waves with controllable rotation.

Main Methods:

• Design of an FSS-based polarization converter (FSS-PC) using a receiving-via-transmitting (RVT) structure.
• Integration of receiving and transmitting antenna structures via metallized via holes acting as transmission lines.
• Experimental fabrication and measurement of the designed FSS-PC prototype.

Main Results:

• The FSS-PC successfully converts any incident LP wave into another LP wave with a counterclockwise rotation angle of 2φ at 11 GHz.
• Achieved high polarization conversion efficiency exceeding -0.30 dB at the central frequency.
• Demonstrated stable high-efficiency polarization conversion across varying incident electric field azimuths.
• Measured results closely matched simulated outcomes, validating the design's effectiveness.

Conclusions:

• The proposed FSS-PC offers a robust and efficient solution for transmitted polarization conversion.
• The design's ability to control polarization rotation via relative azimuth adjustment is confirmed.
• The fabricated prototype validates the simulated performance, paving the way for practical applications.