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Different regimes of electromagnetic signal transmission through heterostructures formed by a sequence of conducting and non-conducting layers are discussed for various ratios between the frequency of radiation and the transport frequency of electron scattering in the conducting layers. Possibility to increase the efficiency of detecting or filtering electromagnetic radiation in a wide range of frequency range (from subTHz to far IR) in such structures is analyzed.

We discuss the detection of broadband radiation in the terahertz frequency range by a bolometric method using heterostructures consisting of a sequence of conducting and dielectric layers of doped and undoped semiconductors (gallium arsenide, germanium). This structure forms a photonic crystal with allowed and forbidden bands (absorption and transmission ranges). By selecting the thicknesses of the conductive and non-conductive layers and the doping levels, it is possible to form spectral intervals of effective absorption, which allows detecting pulses in the frequency range >10^12 Hz with a spectral width of the order of the carrier frequency.

The effect of the resonant tunneling of signals through an overcritical plasma layer in the presence of an external static magnetic field is considered. The aim of the study is to demonstrate the effectiveness of the combined usage of two methods for overcoming radio blackout for aircrafts moving in dense layers of the atmosphere at supersonic velocities: the method of resonant tunneling of the signal in the presence of a dielectric layer and the magnetic windows method. The features of dielectric resonator filling with an electromagnetic wave field are studied for various parameters. The values of the magnetic field induction providing the best signal propagation results through the plasma layer are estimated