Absorptive/Transmissive Frequency Selective Structure Utilizing Slotted Magnetic Material

This paper proposes a novel dual-polarized absorptive/transmissive frequency selective structure (ATFSS) utilizing slotted magnetic material. It has a transmission band at high frequencies and a wide absorption band at low frequencies. The absorption is produced by the magnetic material, while the transmission is produced by the square slot channel in the magnetic material and a band-pass FSS. A cross-shaped metallic plate is placed above the magnetic material to improve the absorption performance. Compared to the conventional ATFSSs, the proposed one has a simple structure and is with no lumped elements. Simulation results a shows a pass-band around 14.1 GHz, with a minimum insertion loss of 1.34 dB and a bandwidth (|S
₂₁
|≥-3dB) of 0.9 GHz. It also achieves a fractional bandwidth of 116.5% of the absorption band (|S
₂₁
| ≤ -10dB). The operating principle and analysis are also discussed in the paper. This proposed ATFSS has potential for military applications to improve the stealth performance.