FIELD: antenna engineering. SUBSTANCE: harmonic filter has rectangular waveguide section with flanges coupled through slotted coupling member with below-cutoff waveguides. The latter are connected with remission space formed by round waveguide section accommodating crystal tube with cooling liquid. Crystal tube is secured on supporting gasket eccentrically so that it can be immersed through variable depth. Cooling liquid may be grade OZh-65 "LENA", water, glycerine, Freon-113, alcohol. External diameter and thickness of crystal tube are given in description of invention. EFFECT: improved design. 6 cl, 4 dwg
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