研究目的
To propose and demonstrate a broadband and wide-angle band-stop frequency selective surface (FSS) based on dual-layered fractal square loops for applications requiring stable electromagnetic filtering over wide angles and frequencies.
研究成果
The proposed dual-layered fractal square loop FSS achieves broadband and wide-angle band-stop characteristics, with measured stop bandwidths exceeding 9.12GHz at normal incidence and over 7.35GHz for TE and 5.91GHz for TM polarization at 60° incidence, demonstrating effectiveness for applications like radar and EM shielding.
研究不足
The FSS performance may be limited by fabrication tolerances, material properties (e.g., dielectric constant variations), and the specific frequency range (centered around 13GHz). Further optimization could address polarization sensitivity and extend to higher frequencies or different materials.
1：Experimental Design and Method Selection:
The FSS was designed using dual-layered periodic arrays of fractal square loops to achieve broadband and wide-angle performance. Equivalent circuit modeling and full-wave electromagnetic simulation (using CST MWS) were employed for analysis.
2：Sample Selection and Data Sources:
A sample was fabricated with optimized parameters (e.g., period p=
3：5mm, edge lengths a1=7mm, a2=1mm) for a center frequency of 13GHz. List of Experimental Equipment and Materials:
F4B-2 board from Wangling Co. as substrate, Nomex honeycomb spacer, Agilent E8363A vector network analyzer (VNA), 8-18GHz spot-focusing horn lens antennas, rotatable foam sample holder.
4：Experimental Procedures and Operational Workflow:
The FSS sample (180mm×180mm with 24×24 unit cells) was fabricated via PCB process. Measurements were conducted in a free-space setup using VNA with TRL calibration and time domain gating to remove multipath effects. Transmission coefficients were measured for incident angles from 0° to 60° for TE and TM polarizations.
5：Data Analysis Methods:
Data were analyzed by comparing simulated (CST MWS and equivalent circuit) and measured transmission coefficients (S21) to evaluate stop bandwidths.
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