# Design and Analysis of Dual-Polarized Frequency-Selective Metasurface for X-Band Notch Applications

## TL;DR

This paper introduces a compact metasurface that blocks signals at 10 GHz in the X-band, useful for RF shielding.

## Contribution

A miniaturized, polarization-insensitive frequency-selective metasurface with high attenuation and wide suppression bandwidth is proposed.

## Key findings

- The FSMS achieves 38.5 dB attenuation at 10 GHz with a 46% suppression bandwidth.
- The design is polarization-independent and angle-insensitive, ensuring consistent performance.
- Simulated and measured results align well, validating its effectiveness for EMI shielding.

## Abstract

This paper presents a miniaturized, polarization-insensitive frequency-selective metasurface (FSMS) with stopband behavior for RF shielding applications. The FSMS is designed to suppress communication at 10 GHz frequency in the X-band. The design comprises a circular metallic patch with a staircase slot engraved in the center. The FSMS achieves an attenuation of 38.5 dB at the resonant frequency with a 10 dB suppression fractional bandwidth of more than 46%. The physical geometry of the unit cell makes it polarization-independent, and the angle of incidence has no effect on the stopband. The FSMS cell has overall dimensions of 0.3λo × 0.3λo × 0.05λo, where λo is free-space wavelength at the resonant frequency. Moreover, an equivalent circuit model (ECM) of the FSMS filter is developed to analyze its operation principle. An FSMS prototype is fabricated and tested for its performance, and the simulated and measured results show good agreement, making it suitable for selective electromagnetic interference (EMI) shielding applications.