Absorptive frequency selective surface using parallel LC resonance

A frequency selective surface with absorptive/ transmissive property is represented. It allows waves at high frequency around 10 GHz to transmit with very low insertion loss by using the resonance between a parallel microstrip LC structure. It also possesses a wide absorption over lower band by inserting lumped resistors into elements. The absorption band is over 3-9 GHz. A prototype is fabricated and its absorptive/ transmissive performance is measured.