The feasibility of waveguide structures that have both forbidden and permitted transmission bands and are based on a diaphragm and frame coupling elements placed on both of its sides is shown experimentally and numerically using the finite element method. It is found out that the dynamic range of controlling the transmission coefficient by means of an n - i - p - i - n -structure placed in the gap between the post and the frame elements attains 23.5 dB, the transmission loss level not exceeding 1.5 dB.
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Усанов et al. (2014) studied this question.
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