SU459000A3 - Waveguide Wave Absorption Filter - Google Patents

Description

(54) WAVEGUIDE ABSORPTION FILTER OF WAVE N

02

The call velocity changes as the radius of the middle portion of the waveguide 5 is smaller. When the HOI wave propagates through the half-ring part 2, the radius of this part becomes larger due to the influence that the dielectric 6 has. Parts 2 and 3. Therefore, it is possible to reverse the direction of the Y02 waves propagating through the parts of waveguide 2 and 3 at its outputs, if the lengths are appropriately selected. In addition, the true radius of the upper semi-circular portion of the waveguide 2 becomes equal to the radius of the lower semi-circular portion of the waveguide 3, when the radii of the upper and lower portions of the waveguide 2 and 3 and the dielectric 6 are selected accordingly. As a result, there will be a difference in the phase velocity between the waves Y0 and propagating through the upper and lower half-rings of waveguide 2 and 3, i.e. the directions of the electric fields of the HOI waves at the outputs of the half-rings of waveguide 2 and 3 become the same. In this case, the Yao waves propagating through the upper and lower 2 and 3 do not have a phase difference. When the influence of reflected waves passing in the forward and reverse waveguide cannot be neglected, the absorbing plates 11 and 12 are placed on the metal plate 4 in the input and output parts of the waveguide 7 and 8 opposite to the inner walls (see Fig. 4) . Yao waves that propagate through the upper and lower semiring parts 2 and 3 and which are shifted to the phase at the outputs of these parts can be absorbed by the absorbing plate 12. The absorbing plate 11 at the input can absorb the remaining reflections of the Yao1 and Yao2 waves that do not coincide in phase, in the upper and lower half ring parts x 2 and 3. Thus, multiple reflections can be prevented. The absorbing plates 11 and 12 are located at right angles to the directions of the electric field strengths of the Yao waves that coincide in phase in the upper and lower half ring parts 2 and 3, so that these waves have almost no effect when the absorbing plates are thick enough small relative to the wavelength.

Subject invention

The waveguide absorption filter of the Yao2 wave, containing a segment of a circular waveguide,

divided in the central part into two semicircular waveguides with different radii by means of a metal plate, the ends of which are superposed with absorbing plates, characterized in that

To reduce losses at the working wave, in a semicircular waveguide of a smaller radius, a thin cylindrical insert of a dielectric material with a low dielectric constant is installed at the maximum of the electric field of the Yao1 wave.

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