Design of a 24 GHz Band Rasorber with High Frequency Selectivity and Broadband Absorption Performance

This paper proposes a frequency-selective rasorber (FSR) structure optimized for 24 GHz wireless communication and radar systems. The proposed FSR provides precise frequency selectivity and a low insertion loss, ensuring stable signal transmission and high absorption near the target frequency band. The operating principle of the FSR was analyzed using an equivalent circuit model, and the design was validated through simulations. Simulation results demonstrated that the proposed FSR achieved a wide bandwidth (FBW = 84.4 %), covering 12.8 to 31.5 GHz, with a reflection coefficient below −10 dB. In addition, it achieved a minimum insertion loss of 0.37 dB at 23.8 GHz. These characteristics effectively mitigate signal interference issues in the mm-wave band and offer a noise reduction solution suitable for advanced applications, such as communication systems and radar sensing technologies.