Title :
A Novel Absorber With Tunable Bandwidth Based on Graphene
Author :
Bingzheng Xu ; Changqing Gu ; Zhuo Li ; Liangliang Liu ; Zhenyi Niu
Author_Institution :
Key Lab. of Radar Imaging & Microwave Photonics, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China
Abstract :
A design of absorber using two-dimensional (2-D) periodic arrays of double-square split loops and resistive strips printed on grounded dielectric substrate is investigated in this letter. Unlike the traditional structure, graphene sheets are proposed for thin absorbing structures at microwave frequencies. The analysis of absorption properties is based on the dynamic model of graphene, which takes into account the surface impedance of graphene layer. Both narrowband and broadband tunable absorbers can be demonstrated with the same structure by tuning the conductivity of graphene. Furthermore, the equivalent circuit method (ECM) is used to introduce the working principles of the proposed absorber. In addition, the absorber shows relatively stable performance with different oblique incidence angles.
Keywords :
equivalent circuits; graphene; radar absorbing materials; surface impedance; 2D periodic arrays; ECM; absorption properties; broadband tunable absorbers; double-square split loops; dynamic model; equivalent circuit method; graphene sheets; grounded dielectric substrate; microwave frequencies; narrowband tunable absorbers; oblique incidence angles; resistive strips; surface impedance; tunable bandwidth; Absorption; Chemicals; Conductivity; Graphene; Impedance; Microwave circuits; Surface impedance; Absorber; equivalent circuit method (ECM); graphene;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2014.2319083
