SU1113863A1 - Coaxial-waveguide cy attenuator - Google Patents

Abstract

A COAXIAL-WAVEGUIDE TRANSITION containing a segment of a rectangular waveguide, shorted by an end wall and made stepped with a reduced height between the end wall and a step, and a segment of a coaxial line placed parallel to the axis of a segment of a rectangular waveguide and connected to it via an exciter element made in the form of a conductor, a continuation of the inner conductor of a segment of a coaxial line and covered with a dielectric, characterized in that, in order to increase the wide The coaxial line segment is inserted into a segment of a rectangular waveguide to a depth exceeding the distance between the end wall and the step, and the planes of the end wall and the step are inclined relative to the narrow wall of the rectangular waveguide segment by the angle oi.at4; tc5 / jLtp and one relative to another where a is the size of a wide wall of a segment of a rectangular waveguide, LSR is the average wavelength of the working range, with a minimum (the distance between the end wall and the step does not exceed L-minA, where XHWH is the minimum length working range waves.

Description

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The invention relates to microwave technology and can be used in the construction of antenna-feeder paths and in measurement technology.

A coaxial-waveguide junction is known, comprising a segment of a rectangular waveguide, to the end wall of which there is a segment of a coaxial line connected to a segment of a rectangular waveguide through an L-shaped exciting element, which is a continuation of the inner conductor of a segment of a coaxial line El.

A disadvantage of the known coaxial-waveguide junction is the narrow band of operating frequencies, due to the design of the l-shaped exciting element.

Closest to the proposed technical property is a coaxial-waveguide junction containing a segment of a rectangular waveguide, shorted-cut. wall and stepped with a reduced height between the end wall and the step, and a segment of a coaxial line placed parallel to the axis of a segment of a rectangular waveguide and connected to it by means of an excitation element made in the form of a conductor, a continuation of the inner conductor of a segment of a coaxial line and covered with f2j .

A disadvantage of the known coaxial-waveguide junction is the narrow operating frequency band, due to the presence of a quarter-wave step.

 The purpose of the invention is to increase the broadband.

To achieve this goal, a coaxial-waveguide junction, containing a rectangular waveguide detachment, shorted with an end wall and made stepped with a reduced height between the end wall and a step, and a segment of a coaxial line placed parallel to the axis of a rectangular waveguide and connected to it by means of element made in the form of a conductor / which is a continuation of the inner conductor of a segment of a coaxial line and covered with a dielectric, a segment coaxially The first line is inserted into a segment of a rectangular waveguide to a depth exceeding the distance between the end wall and the step, and the planes of the end wall and step are inclined relative to the narrow wall of the rectangular waveguide segment by the angle л-ГGSC and one relative to the other, where Q is the size of the wide wall a segment of a rectangular waveguide, and L - average.

the wavelength of the working range, while the minimum distance between the end wall and the step does not exceed L.min / 4-, where n is the minimum wavelength of the working range.

FIG. 1 schematically shows a coaxial-waveguide transition, a cut along the longitudinal plane of symmetry; in fig. 2 - the same, view from

0 side of the wide wall of a rectangular waveguide; in fig. 3 is the same, the view from the end of a segment of a rectangular waveguide.

Coaxial waveguide transition

5 contains a segment 1 of a rectangular waveguide, shorted by the end wall 2 and made step with a reduced height b between the end wall 2 and step 3,

Q with a height of 6 of segment 1 of a rectangular waveguide, and a segment of 4 coaxial lines, placed parallel to the axis of segment 1 of a rectangular waveguide and connected to it along 5 by means of a driving element 5, made in the form of a conductor .6, which is a continuation of the coaxial segment 4 line and coated with dielectric

Q 8. Section 4 of the coaxial line is inserted into section 1 of a rectangular waveguide to a depth L exceeding the distance between the end wall 2 and the step 3, and the end plane

 walls 2 and steps 3 are inclined

- relatively narrow wall 9 of segment 1 of a rectangular waveguide at an angle ct Qrctq o / OLef and one relative to another, where a is the size of a wide wall 10 of segment 1 rectangular

0 is a waveguide, and LSR is the average wavelength of the working range, while the minimum distance o between the end wall 2 and the step 3 does not exceed l min / 4, where is the minimum wavelength of the working range.

Coaxial-waveguide transition works as follows.

Q A microwave signal arriving over segment 4 of a coaxial line excites the type H electromagnetic field in segment 1 of a rectangular waveguide. The excitation of the H / Descale wave is produced by the pressing of the step 3 and the driving element 5, as well as by shifting & axes of section 1 of a rectangular waveguide and section 4 of a coaxial line.

The increase in broadband is ensured by the inclination of the planes of the end wall 2 and of the steps 3 relative to the narrow wall 9 at an angle ot and one relative to the other, while due to the variable distance between the plane of the end wall 2 and the step 3, it is possible to realize the required reactivity of the short-circuited segment 1 of a rectangular waveguide transformed to exciting element 5. Parameters of a coaxial-waveguide junction are also realized with the correct choice of the depth L of the immersion of the segment 4 coaxial This is a line in a segment 1 of a rectangular waveguide in length 1 of an exciter element 5, determined experimentally. In the example of a specific implementation of a coaxial-waveguide transition with dimensions: 23 mm, mm, 6-5 mm, t-8 mm, L 17 mm, mm, 5 mm And the length of the coaxial line in the form of cable RK-50-212 is obtained , tlctvi, in the frequency band 9-12 GHz. The implementation of a coaxial-waveguide transition in the form of a stub of cut 1 of a rectangular waveguide mounted for movement in it provides adjustment of the phase shift introduced by the transition, which further extends its functionality.

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Claims (1)

COAXIAL-WAVEGUIDE TRANSITION containing a segment of a rectangular waveguide shorted by the end wall and made stepwise with a reduced height between the end wall and the step, and a segment of a coaxial line placed parallel to the axis of the segment of the rectangular waveguide and connected to it by means of an exciting element made in the form of a conductor, which is a conductor made in the form of a conductor continued an inner conductor of a segment of a coaxial line and coated with a dielectric, characterized in that, in order to increase broadband, a segment of a coaxial line is inserted into the segment of a rectangular waveguide to a depth greater than the distance between the end wall and the step, and the planes of the end wall and step are inclined relative to the narrow wall of the segment a rectangular waveguide at an angle “i. = arctcj and one relative to the other, where o is the size of the wide wall of a segment of a rectangular waveguide, Ler is the average wavelength of the working range at the same time, the minimum distance between the end wall and the step does not exceed where is the minimum wavelength of the working range. DOF FD>