Figures of a dual-polarized frequency selective rasorber withwide transmission band

We proposed a novel and simple dual-polarized frequency-selective rasorber (FSR) which has a wide absorption band including a wide transmission band. The structure consists of a lossy frequency-selective surface (FSS) constructed with metal rings connected by center loaded strips as the top layer, and a broad band transmission FSS at the bottom, while the two layers are separated by air. To clearly understand how it works,  detailed equivalent circuit was derived to accurately predict the frequency responses of the structure. To validate our proposal, a prototype was fabricated and measured.

In this data file, simulation results obtained by commercial software Ansys HFSS and measurement results are listed. The measured results are in good agreements with simulations under normal incidence, which indicates a broad absorption bandwidth of 80% that from 3.40 GHz to 8.16 GHz; in the meantime, a wide transmission band with an insertion loss of less than -1.25 dB is ranging from 9.03 GHz to 12.01 GHz. It should be pointed out that, the reflection from the whole structure in the operation band can be kept below -10 dB from 4.15 GHz to 11.87 GHz.

Methods
The simulation results are all obtained through commercial software Ansys HFSS. The measurement was carried out in a microwave anechoic chamber.