Abstract
Electrodynamic properties of two-dimensional (2D) planar Bragg resonators realising 2D distributed feedback were studied. It is shown that high selectivity of a 2D Bragg resonator originates from the specificity of the dispersion diagrams of normal waves in a double-periodic corrugated unbounded planar waveguide resulting in formation of high-Q eigenmodes in the vicinity of the Bragg resonance frequency. Results of theoretical analysis in the frame of geometric-optical approach of coupled-wave theory coincide well with 3D simulations using the code CST “Microwave Studio” and are corroborated by data obtained in “cold” microwave tests. Frequency dependences of scattering coefficients were measured for incident wave-beams of different structures and excitation of the high-Q eigenmodes has been demonstrated.
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