The angular properties of a multilayer interference absorber (MIA) are theoretically investigated. It is shown that, with inclination of the MIA, its resonant curve is shifted into the short-wave region, and the magnitude of the shift is proportional to the square of the angle of incidence of the radiation. A simple expression is obtained, describing the form of the central lobe of the MIA directionality diagram. The laws for the suppression of external noise in receivers with MIA at the inlet are discussed, together with the possibilities of tuning these receivers with respect to the resonant frequency following from the MIA angular properties.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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