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However, the double or multilayer FSS structures face errors resulting from fabrication process, sensitivity in response, and also a substantial amount of insertion loss at the resonance arising from strong effects of the localized electric field within the lossy dielectric medium.
The reduced independent controllability, high insertion loss, and fabrication/implementation difficulties are some of the problems faced in miniaturized dual-band single screen FSSs.
It is noticed that two pass bands are adjustable independently, simply by changing the geometric parameters of the elements while offering wider bandwidth and lower insertion loss.
In [29], we can observe very narrow band behavior of single layer FSS by using different fractal array elements, and the reference of insertion loss does not reach better than 20 dB.
Additionally, the BW and insertion loss are not sensitive to the cavity count
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