Using analytical approaches and CST Microwave Studio 3D simulations, we have undertaken a theoretical analysis of electrodynamical characteristics of 2D Bragg structures based on planar oversized dielectric waveguides with double-periodical corrugation. Such structures are of significant interest for obtaining directed narrow-band radiation in heterolasers with large dimensions of an active area. Modeling electrodynamical experiments on 'cold' testing of such structures in millimeter wavelength band were conducted. Fine agreement between the experimental results and the simulation results was demonstrated
which includes the presence of the highest-quality mode inside the Bragg reflection band in absence of the periodicity defects.
Quasi-optical Bragg structures that represent sections of planar waveguides with tilted (with respect to the beam propagation direction) corrugation are studied. It is shown that such structures may serve as efficient deflectors for high-power wave fluxes and, hence, can be used for separation of microwave radiation and electron beam in relativistic masers. The corrugation configuration is optimized to increase the efficiency of transformation of wave fluxes to the transverse direction and improve uniformity of the spatial distribution of scattered radiation. The simulated results are verified using cold electrodynamic tests.
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