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Low-profile conformal single-sided miniaturized frequency selective surface for wideband shielding
Malathi Kanagasabai1, Lavanya Viswanathan1, M Gulam Nabi Alsath1
1Department of Electronics and Communication Engineering, College of Engineering, Guindy, Anna University, Chennai, 600025, India.
Scientific Reports
|April 5, 2025
Summary
This study introduces a compact, single-layer frequency selective surface (FSS) for ultra-wideband shielding. The novel design achieves a 109% fractional bandwidth with high shielding effectiveness, suitable for diverse applications.
Area of Science:
- Electromagnetics and Wave Propagation
- Metamaterials and Metasurfaces
- Antenna and Microwave Engineering
Background:
- Frequency Selective Surfaces (FSS) are crucial for controlling electromagnetic wave propagation.
- Existing FSS designs often face limitations in terms of size, bandwidth, and conformability.
- The need for miniaturized and wideband shielding solutions is growing in various electronic applications.
Purpose of the Study:
- To design and validate a novel, miniaturized, ultra-wideband (UWB) frequency selective surface (FSS).
- To achieve a conformal, low-profile, and single-layered FSS with a wide operational bandwidth.
- To demonstrate high shielding effectiveness and stability over a broad range of incidence angles.
Main Methods:
- Design of a simple modified star swastika (MSS) unit cell for the FSS.
- Electromagnetic simulations to analyze performance characteristics like bandwidth and shielding.
- Equivalent Circuit Model (ECM) analysis for physical understanding of the unit cell.
- Fabrication of an FSS prototype and validation of simulated results with measured data.
Main Results:
- Achieved a 7.5 GHz bandwidth with transmission nulls from 3.1 to 10.6 GHz.
- The miniaturized unit cell (0.041λ₀) offers 61% size reduction.
- Demonstrated a -10 dB fractional bandwidth of 109.48% and peak shielding of 67.9 dB.
- Stable performance for Transverse Electric (TE) and Transverse Magnetic (TM) modes up to 75° incidence angles.
Conclusions:
- The proposed simple modified star swastika (MSS) frequency selective surface (FSS) provides excellent ultra-wideband performance.
- The design is conformal, low-profile, single-layered, and significantly miniaturized.
- The validated results indicate its potential as a robust solution for wideband electromagnetic shielding applications.
