Abstract
Quasi-fractal PBG structures for Multi-Beam Devices
Highlights
In the defect area it is appeared local electromagnetic waves similar to electromagnetic waves of ordinary cavity resonators
We have designed a quasi-fractal double-gap cavity based on PBG structure. 3D-models of studied resonance system are illustrated in table
Computer models of studied PBG structure top view, c) transverse section. It had the following dimensions: lattice depth 10 mm, metal rods diameter 2 mm, spacing between the rods, 3.7 mm, drift tube radius 1.0 mm; gap length 1.5 mm; resonance rods thickness in along-track beam direction 3 mm. It was studied the influence of number n additional longitudinal rods that are inserted into 3D defect area, at a frequency of indicated modes
Summary
They must have a high characteristic impedance ρ = R/Q0 and increased (compared to the operating wavelength) dimensions. In the defect area it is appeared local electromagnetic waves (defect modes) similar to electromagnetic waves of ordinary cavity resonators. The advantages of PBG are increased overall dimensions, high unloaded Q-factor, comparative simplicity of engineering implementation, as well as the possibility to suppress undesirable (parasitic oscillation).
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