An Ultralow RCS Frequency-Selective Rasorber With Wide Transmission Utilizing a Hybrid Absorption and Phase Cancellation Mechanism

This work proposes an ultralow scattering frequency selective rasorber (FSR) with a wide passband. By integrating absorption and phase cancellation mechanisms, a radar cross section reduction (RCSR) of over 20 dB is achieved across a wide frequency range. First, using array theory, the reflection characteristics of the unit cell that achieves a 20 dB RCSR for the array are derived. The impact of the unit cell on the array’s transmission characteristics is also investigated. Second, an FSR config