UHF Metamaterial Absorber with Small-size Unit Cell by Combining Fractal and Coupling Lines: Recent Study

We present an UHF prefect metamaterial absorber by combining coupling lines and fractal lines with
very small unit cell. The proposed absorber consists of surface metal structure and metallic
background plane, separated by a dielectric substrate and air. Simulation results show that the
absorber has absorption peak at 442MHz with 99.73% absorptivity. The ratio between lattice constant
and resonance wavelength is 1/68, significantly less than the existing absorber. According to the
absorption mechanism of proposed absorber the design principle is introducing in detail. Moreover,
the absorption peaks remain high with large angles of incidence for both TE and TM polarizations.
Due to the small ratio, it can be widely used in radiation suppression for microwave relay
communication such as mobile communication and wireless network by changing the parameters of
structure.