SU1473598A1 - Slow-wave structure - Google Patents

Abstract

The invention relates to electronic microwave devices, in particular to devices of the type TWT. The aim of the invention is to increase the amount of coupling of a crax line to the input or output resonators and to expand the frequency band of the matching. In the proposed slow-wave system, the inner conductor of the coaxial line 1 passes from the front side of the input (output) resonator 2 and is fixed to the communication element 3 mounted on the opposite wall of the resonator 2. The element 3 is parallel to the slow-wave system axis. The input resonator The coupling located on the other side of the drift tubes 4 with respect to the coupling element 3 is connected with the adjacent resonator 5. The increase in the resonant frequency of the resonator 2 caused by the introduction of the coupling element is compensated a corresponding increase in the diameter of the resonator or the distance between the windings of the 4 drift tubes. 4 il. i i (L

Description

I

The invention relates to electronic microwave devices, namely to devices of the type TWT.

The aim of the invention is to increase the magnitude of the coaxial link coupling to the input or output resonator and to expand the frequency band of the matching.

Figure 1 shows the deceleration system in Clauses 2, 3, 4 shows a communication element in three projections,

The inner conductor of the coaxial pin 1 passes from the front side of the input (output) resonator 2 and through a hole in its end wall on the coupling element 3, mounted on the opposite wall of this

resonator, and electrically connected to it. Element 3 is a bond, shaped like a shovel or scoop 4--. (4HG.2), is located parallel to the axis of the slowing-down system at the radius of the response communication, occupying the azimuth at the attachment point of the central angle 0 90-180 and narrowing smoothly to the size of the central conductor of the coaxial line, starting from a height h of 0.1 -0.5 axial size of the resonator. The thickness of the communication element is approximately equal to the diameter of the inner conductor of the coaxial line. An input resonator with a communication aperture located on the other side of the drift tubes 4 relative to the coupling element 3 is connected to the adjacent resonator 5.

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The proposed device operates as follows.

The signal from an external source goes to the input resonator 2 to the coupling element 3 whose dimensions (nL-n h) are chosen so as to lower the Q-factor of the input (output) resonator to the value necessary for matching the coaxial line with the deceleration system in the frequency band. approximately equal to the bandwidth of the tactile circuit, and excites in it an electromagnetic field. The coupling element 3 is separated from the surface of the drift 4 of the tube. The third one, in which the first harmonics are harmonic, the perturbation fields quickly decay. So, for example, when a coupling element is removed from the outer surface of the drift tubes by P mm (as the calculation shows) in a slow system, which has an axial input diameter of 12.5 mm, diameter 70 mm, outside the radius of the drift tube 8 mm, the inner radius of the drift tube 6 MM | the gap (zsrr) between the drift tubes varies within 1 / 3-1 / 2 of the axial size of the resonator, the amplitude of the first spatial harmonic of the perturbation field of the oscillator when reaching the gap v between the drift tubes is more than 700 times as compared with its amotidity the location of the communication element (harmonics with a higher index decay faster) In this case, we can speak practically; the complete elimination (with an accuracy of 0.2%) of the azimuthal inhomogeneity of the field in the region of its interaction with the electron beam. The communication between the cells of the slow-wave system is carried out using communication holes. The delayed signal will interact with the electron beam. .Transit through the system, excite the electromagnetic field in the output resonator, and the microwave power will be transferred to the output coaxial line by means of an elec- tion 3.

The procedure for changing the magnitude of the connection of a coaxial line with an input (output) resonator in the process of coaxial input (output) matching

It is technologically simple, as the matching element can be removable during the matching process. The increase in the resonant frequency of the input (output) resonator 2, caused by the introduction of the communication element, is compensated by a corresponding increase in

resonator diameter, either by decreasing the distance between the drift tubes 4, or by using a combination of them.

If the specified size ratios are not fulfilled, the matching of the communication element with the coaxial line is impaired and the frequency band is reduced.

Claims (1)

Invention Formula A microwave-slowing-down system containing resonators whose end walls are equipped with drift tubes and communication holes, an energy input or output device including a segment of a coaxial line whose central conductor passes through an opening in the first end wall of the input or output resonator and connected to the / communication element, which differs as - so that, in order to increase the magnitude of the coaxial line coupling with the input or output resonators and expand the frequency cavity of the matching, the communication element is designed as a constraint The two parts of the cylinder section, coaxial drift tube, smoothly narrowing to the size of the central conductor of the coaxial line segment, and connected to the second torso wall of the input or output resonator, with the axial size h of the cylinder section, and the central angle oi between its limiting part. the generators satisfy the expressions. 0, and-2-eO, 5  , where 1 - the size of the resonator along the axis retarding system, Mf h - axial size, m. L -.------. one - DO ffJUPl (rig 2 figs