研究目的
To design, simulate, fabricate, and validate a single-layer polarization independent quad-bandpass frequency selective surface (FSS) with wide band ratio for applications in communication systems and radar cross-section reduction.
研究成果
The proposed FSS successfully achieves polarization-independent quad-bandpass performance with wide band ratios (1.26 to 2.2) and excellent angular stability up to 45° incidence. It is compact and suitable for applications in military, defense, and wireless communications. Measured results align well with simulations, confirming the design's effectiveness.
研究不足
Slight variations at higher frequencies due to material losses and fabrication imperfections; the structure is finite in size, which may affect performance compared to infinite theoretical models.
1：Experimental Design and Method Selection:
The FSS unit cell was designed using a symmetrical arrangement of four rotated units to achieve quad-bandpass characteristics. Full-wave simulations were performed using CST Microwave Studio with periodic boundary conditions and frequency domain solver.
2：Sample Selection and Data Sources:
An array of 12x12 unit cells was fabricated on an FR4 substrate.
3：List of Experimental Equipment and Materials:
FR4 substrate (εr=
4：4, tanδ=02, thickness 6 mm), metal for etching, Agilent N5320A Vector Network Analyzer, double ridged horn antennas, anechoic chamber. Experimental Procedures and Operational Workflow:
The FSS was fabricated via chemical etching. Transmission and reflection coefficients were measured in free space using VNA and horn antennas for TE and TM modes at normal and oblique incidences.
5：Data Analysis Methods:
Simulated and measured results were compared to validate performance, with analysis of bandwidth, band ratios, and angular stability.
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