Single-layer angle-selective surface with broad frequency bandwidth and wide angular passband for X-band applications

Area of Science:

• Electromagnetics
• Metamaterials
• Antenna Theory

Background:

• Metasurfaces offer unique electromagnetic wave manipulation capabilities.
• Angle-selective surfaces (ASS) are crucial for applications requiring directional control of electromagnetic waves.
• Achieving broad frequency bandwidth and wide angular passband simultaneously remains a challenge.

Purpose of the Study:

• To propose and analyze a novel single-layer dual-resonance metasurface for angle-selective surface (ASS) applications.
• To investigate the frequency bandwidth and angular passband characteristics of the proposed ASS.
• To validate the design through circuit modeling, electromagnetic simulations, and experimental measurements.

Main Methods:

• Design of a unit cell comprising square and X-shaped slot resonators for dual-resonance behavior.
• Analysis of the ASS principle from a circuit perspective, establishing and verifying a dual-resonance equivalent circuit model.
• Electromagnetic simulations and experimental fabrication and measurement to assess performance.

Main Results:

• The proposed ASS exhibits good and stable angular selectivity under TE polarization between 10.5 and 11.5 GHz.
• An angular passband (S21 > -1 dB) was observed, spanning up to 57° at 10.5 GHz and a minimum of 42° at 11.5 GHz.
• Experimental results closely align with simulation data, confirming the wide angular passband and broad frequency range.

Conclusions:

• The developed single-layer dual-resonance metasurface effectively functions as an angle-selective surface.
• The design achieves a desirable combination of broad frequency bandwidth and wide angular passband.
• The validated circuit model provides a robust framework for understanding and designing similar ASS devices.