Broadband Frequency Selective Rasorber Based on Spoof Surface Plasmon Polaritons

Area of Science:

• Electromagnetics
• Materials Science
• Metamaterials

Background:

• Frequency selective rasorbers (FSRs) are crucial for electromagnetic wave absorption.
• Spoof surface plasmon polaritons (SSPPs) offer a promising approach for designing compact and efficient absorbers.
• Existing FSR designs often face limitations in bandwidth and angular stability.

Purpose of the Study:

• To propose and validate a novel broadband frequency selective rasorber (FSR) based on spoof surface plasmon polaritons (SSPPs).
• To investigate the absorption performance of the proposed FSR across a wide frequency band and varying incident angles.
• To confirm the design's reliability through simulation and experimental measurements.

Main Methods:

• Utilized a multi-layer structure comprising frequency selective surface (FSS), polyresin (PR), and indium tin oxide (ITO) on a metal base.
• Employed full-wave simulation and an equivalent circuit method to analyze transmission characteristics.
• Conducted experimental measurements in an anechoic chamber to validate simulation results.

Main Results:

• Achieved over 95% absorption in the 5-30 GHz band and 80% in the 3.5-5 GHz band under normal incidence.
• Demonstrated stable absorption performance, with minimal degradation up to 40° incident angle for transverse magnetic (TM) modes.
• Experimental results showed excellent agreement with simulation predictions, confirming design reliability.

Conclusions:

• The proposed SSPP-based FSR exhibits excellent broadband absorption performance.
• The structure demonstrates robustness against varying incident angles, particularly for TM polarization.
• The validated design offers a reliable solution for advanced electromagnetic wave absorption applications.