Abstract
Evolution of Low-Profile Ultra-Wideband Frequency Selective Surface with a Stable Response and Sharp Roll-Off at Lower Band for C, X and Ku Band Applications
Highlights
Frequency Selective Surface (FSS) is a sort of spatial filter which evinces both bandpass and bandstop responses based on the structure of the unit cell [1,2,3,4]
The transmission coefficients, phase plots for different FSS structure have been simulated using unit cell boundary condition where Floquet Port excitation was assigned in High Frequency Structural Simulator (HFSS) software
An additional inductance due to the metallic conducting patch is introduced in parallel which increases the 10 dB reflection band of FSS 3 compared to the FSS 2 reflection bandwidth due to mitigation of overall inductance which in turn reduces the Q-factor of the design (Bandwidth is inversely proportional with Q-factor)
Summary
FSS is a sort of spatial filter which evinces both bandpass (aperture or grid type) and bandstop (patch type, cross type, slot type) responses based on the structure of the unit cell [1,2,3,4]. A new FSS design methodology for ultra-wideband application was proposed in [14] It consists of an array of two different patch elements – one square loop and one crossed dipole – associated with each other in a single unit cell, to enhance the bandwidth of each individual patch analyzed separately, achieving a bandwidth of almost 52.4%. The final FSS unit cell is designed with the previously mentioned corrugated square slot placing both side of the dielectric substrate with reduced size of the corrugation This modified structure upgrades the bandwidth to 107% ranging from 5 GHz to 16.5 GHz covering all the three bands (C, X and Ku band). The transmission coefficients, phase plots for different FSS structure have been simulated using the Finite Element Method magnetic solver High Frequency Structural Simulator (HFSS)
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