Absorbency Spectrum of Dual Band Metamaterial Absorber

Abstract

This paper study on the absorbency of dual band metamaterial absorber. The metamaterial absorber is designed based on a rectangular shaped for the patch layer and full ground plane plated as a ground layer. Both layers are used Perfect Electromagnetic Conductor (PEC) with 0.0.35 mm. Meanwhile, TLY-5 material is used as a substrate which is stacked in between the patch and ground. The thickness of the TLY-5 substrate is chosen to be 0.018λ to the respect of the lower resonant frequency. Initially, the rectangular patch is designed horizontally, then being rotated anti-clockwise from 0° to 90° to study the change of the absorbency. Thus, to study the harmonic frequency in order to developed the dual band metamaterial absorber while maintained the perfect absorbency for each band. Maximum absorbency is achieved as the rectangular patch is rotated at 45o. Dual band metamaterial absorber is developed which are resonated at 2.50 GHz with 99.92% absorbency and 4.97 GHz with 99.95% absorbency. Then, the Q-factor of the dual band metamaterial absorbed is evaluated to study the relationship between the substrate’s thickness against the bandwidth at each resonant peak. These features have the potential to be utilized in reducing radar cross-section for stealth applications in satellite and radar communications transmission.