文档介绍：
Metamaterial Absorber with Active Frequency Tuning in
Microwave Frequency Band
Hao Yuan, Junming Zhao, Yijun Feng, Bo Zhu**
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(Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing
University, Nanjing, 210093 China)
Abstract: This paper presents the design, fabrication, and measurement of an active frequency tunable
metamaterial absorber in microwave frequency band. The unit cell of the metamaterial absorber
consists of a metallic strip on the top layer of the fully grounded dielectric substrate, with a varactor
loaded at the slit in the middle of the central strip. Simulation and measurement results show that by
tuning the bias voltage applied on the varactors, the peak absorption frequency can be tuned about
GHz with the peak absorption greater than 95% at X band. Field analysis reveals that the unit cell of
the absorber works as the microstrip resonator which exhibits matched input resistance to the incident
waves.
Key words: Metamaterial; Absorber; Tunable; Microwave.
0 Introduction
ic (EM) wave absorber is a functional material that could absorb incident EM
energy. Conventional EM absorbers are mainly realized by using material with high ohmic loss
and ic polarization loss [1-3]. The metamaterial absorber (MA) is another new type of EM
absorber proposed recently [4]. It is posed o