Layered Admittance Reconstruction to Synthesize Broadband FSS Absorbers With Ultralow Reflection

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Synthesizing multilayer resistive frequency-selective-surface (FSS) absorbers under stringent wideband low-reflection requirements remains challenging, as the required contribution of each layer is not straightforward to prescribe. This letter presents a layered admittance reconstruction (LAR) method, in which a reference Jaumann absorber serves as a target generator, and its input-admittance trajectories at different layer positions are reconstructed in a compact multilayer FSS absorber with thinner spacers. For each reconstruction stage, the ideal complex admittance required by the current FSS layer is determined from the corresponding reference trajectory and the already reconstructed lower substructure. With the lower substructure fixed, the current layer is synthesized against this prescribed admittance target, thereby providing an explicit stage- wise organization for multilayer synthesis. A resistive FSS unit cell with enhanced admittance tailoring is developed to realize the prescribed layer- wise admittance targets. A four-layer absorber achieves reflection below$-20$dB from 3.47 to 20.38 GHz (141.8%) and below$-30$dB from 4.14 to 12.92 GHz (103.0%) in simulation. Measurements validate broadband low reflection from 3.15 to 17 GHz at about the$-20$dB level under normal incidence, and TE-polarized oblique-incidence measurements further support the angular response under selected conditions.

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