A wideband, polarization-insensitive and wide-angle metamaterial absorb based on resistance film is proposed in this paper. A unit cell of the absorber consists of an open metal square ring loaded with four resistance films, FR4 substrate, PMI foam, metal backboard in turn. CST software simulation results show that the absorber can absorb electromagnetic waves in a wide band in the range of 10.6-26 GHz, and the absorptivity is greater than 90%. The simulated absorptions under different polarization conditions and incident angles show that this absorber is polarization-insensitive and of a wide inciting angle. The results provide theoretical guidance for the preparation of experimental research in the future.
The switchable channel polarization conversion device is of wide use in microwave, infrared and optical regimes, while it still faces the difficulty to realize the controllable and stable performance. Here, we proposed a VO2 based metastructure method to realize the polarization conversion performance. Owing to the inherent property of VO2, 68℃ is a nature switching point, which endows the proposed converter with the characteristic of high temperature reflection and low temperature transmission. To proof our design paradigm, the linear polarization (LP) converter with 68℃ as the critical point is designed, which achieves the strong polarization conversion at the transmissive part for low temperature from 2.5THz to 3.0THz and reflective part for high temperature from 2.0THz to 2.5THz. Significantly, this simple manipulation method will have wide application in other bi-direction function design.
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