Abstract
Selective wave-transmitting absorbers which have one or more narrow transmission bands inside a wide absorption band are often demanded in wireless communication and radome applications for reducing the coupling between different systems, improving anti-jamming capability, and reducing antennas’ radar cross section. Here we propose a feasible method that utilizing composite of two metasurfaces with different polarization dependent characteristics, one works as electromagnetic polarization rotator and the other as a wideband polarization dependent electromagnetic wave absorber. The polarization rotator produces a cross polarization output in the wave-transmitting band, while preserves the polarization of the incidence outside the band. The metasurface absorber works for certain linear polarization with a much wider absorption band covering the wave-transmitting frequency. When combining these two metasurfaces properly, the whole structure behaves as a wideband absorber with a certain frequency transmission window. The proposal may be applied in radome designs to reduce the radar cross section of antenna or improving the electromagnetic compatibility in communication devices.
Highlights
Electromagnetic (EM) energy absorption is a very important technique issue in electromagnetics and different kinds of EM absorbers have been widely applied in many areas
A significant application of EM absorber is to reduce the radar cross section (RCS) of objects to protect them from detecting by hostile radar
Selective wave-transmitting absorbers (SWTAs) are of great interest owing to their unique characteristic in the design of radome that EM waves are blocked at a wide frequency band while transparent at one or few frequencies with low insertion loss
Summary
Electromagnetic (EM) energy absorption is a very important technique issue in electromagnetics and different kinds of EM absorbers have been widely applied in many areas. A simple algorithm of bilayered CMMs utilizing transmission matrix (T matrix) provides a useful tool to analyze EM wave response of complex CMMs, and it may serve as a guide to identifying designs for a desired polarization response.[19] low profile, wide working frequency band, high conversion efficiency and tunability are still the design requirements of practical polarization rotators or convertors. We combine two metasurfaces with different functionalities to achieve narrow transmission band through polarization control among a wider absorption band. The SWTA is functioning by converting a narrow band of incident wave to its cross-polarization by the first metasurface structure while keeping the out-of-band signals unchanged, and resulting in a narrow bandpass within a wideband absorption of the incident microwave by the second metasurface structure
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