Coaxial resonator chetyrehjadernyj

 

(57) Abstract:

Usage: multi-beam microwave devices klystrons type, such as klystrode and klystrons distributed interaction, which can be used in electronic devices as amplifiers and generators. Coaxial chetyrehjadernyj resonator executed multi-channel, and the outer conductor has the form of a hollow metal cylinder with an abrupt change of inner diameter in its middle part, in which there are groups of bushings, forming a passage channels. Axis all channels parallel to the axis of coaxial and removed from it at the same distance. Short wires connecting the body cavity with the Central bushings are perpendicular to the axis of the coaxial and fixed in the middle of the extended part of the outer conductor and inner conductor serially connected groups of intermediate bushings through arcuate conductors and additional short conductors arranged radially and fixed to the end of the inner conductor. In part of the outer conductor, which has a smaller diameter, is short piston is arranged to move. Tech is on energy between the electron stream and the field of the resonator. 2 C.p. f-crystals, 8 ill.

The invention relates to the field of electronic microwave devices, namely to design resonators multi-beam microwave devices klystrons type, for example the span of the klystron, klystrode and distributed klystron interaction.

Known for broadband single-beam amplifying klystrons, the output resonant system which is made in the form mnoGoSearch resonators, in particular chetyrehjadernogo, with the passage of the pipes attached to the body of metal rods.

Widespread quarter-wave mnogozernye resonators with phase-type oscillations, in which the phase shift between adjacent gaps is 180obecause these crystals have the highest characteristic impedance (proportional to the square of the number of gaps) compared to other types of resonators, with fewer gaps, or other type of oscillations (see Grigoriev A. D., C. jankiewicz B. Resonators and resonator slow-wave microwave system: Numerical methods of calculation and design. - M.: Radio and communication, 1984).

Well known, for example, the design of the broadband amplifier klystron containing chetyrehjadernyj reason the gaps. Such a resonator can operate in the mode of excitation of the in-phase oscillations (phase shift between the voltages at the gaps of zero degrees), and in anti-phase excitation (the phase shift is 180o). However, such a resonant system has a large size when operating in the far infrared and microwave range and a relatively low characteristic impedance (see As/with USSR N 1659185/26-25, publ. 26.01.1973, bull. N 9, 26.03.1973).

Closest to the claimed invention by a combination of traits and selected by us as the prototype is coaxial chetyrehjadernyj resonator single-beam span klystron operating in opposite phase with the oscillations of the outer conductor which serves as a housing cavity, made in the form of a hollow metal element, closed on two sides of the end caps attached to the housing end adjacent bushings, and inner conductor has the form of a rod connected at one end with an arcuate conductor with two intermediate span sleeves, and at the other end with one end cap cavity, and a Central sleeve located between the two intermediate sleeves, connected to the housing of the resonator the form of a single span channel cavity (see As/with USSR N 1420197/26-25, publ. 21.06.1971, bull. N 20, 26.08.1971).

However, obtaining high efficiency with the use of such a resonant system in single-beam microwave devices klystrons type is difficult for several reasons. Primarily due to the fact that for effective power in space distributed interaction in such a resonator with the same field strength in the gap, you want "neogrammarians bunch of electrons with a definite amount of space charge, depending on microperveance beam. This value must not exceed the values of 1-1,5 μa/IN3/2(see Devils Y. R., Bobrovsky Y. L., Kovalev, D. I., O. Mineev Century About the optimal design of klystrons with distributed interaction. // Electronic engineering. Ser. Vacuum and gas-discharge devices. Vol. 3 (138), 1992). This limits the bandwidth of the amplified frequency microwave devices such resonators.

This disadvantage can be eliminated in the multi-beam microwave devices with multichannel mnogozernye resonators.

Tasks are addressed by the invention are the reduction of the overall dimensions of the device microwave, as well as the efficiency of the exchange of energy is m, that coaxial chetyrehjadernyj resonator executed multi-channel, and the outer conductor has the form of a hollow metal cylinder with an abrupt change of inner diameter in its middle part, in which there are groups of bushings, forming a passage channels, and the axis of all channels, including channels limit the span of the bushing parallel to the axis of coaxial and removed from it at the same distance, short wires connecting the body cavity with the Central bushings are perpendicular to the axis of the coaxial and fixed in the middle of the extended part of the outer conductor and inner conductor serially connected groups of intermediate bushings through arcuate conductors and additional short conductors, located radially and fixed to the inner end of the conductor.

The objectives are also achieved the optimal choice of the design elements of the resonator, in which the arcuate conductors are installed at an angle with respect to short the conductors located radially and fixed to the end of the inner conductor, so that the centers of the cross-section of these guides, the most remote from the second part of the outer conductor is selected from the condition:

< / BR>
where R1is the radius of the constricted part of the outer conductor, m;

R2is the radius of the extended part of the outer conductor, m;

Lto- short length conductors, fixed in the middle of the extended part of the outer conductor, m;

dW- outer diameter span sleeves, m

In addition, part of the outer conductor, which has a smaller diameter, is short piston is arranged to move.

The invention is illustrated by drawings, where Fig. 1 shows a cross-section of the resonator system of Fig. 2 is a longitudinal section in the plane a-a of Fig. 3 is an isometric view with a quarter section, where the third part of the system elements, forming a passage channel conventionally not shown.

The resonator includes an external conductor 1 that serves as a housing of the resonator. This guide is made in the form of a hollow metal element, a represents the cylinder to the stepwise change of the internal diameter in its middle part, in which there are groups of bushings, forming a passage channels. The outer conductor is closed on two sides of the end caps 2 and 3, located respectively in the extended and narrowed his part. Vobratnyh conductors 5 and additional short conductors 6, located radially intermediate span bushings 7 and 8. The other end of the inner conductor is connected to one end cap of the resonator 3. Short conductors 9, which connects the body of the resonator with a Central bushing 10 are perpendicular to the axis of coaxial and fixed in the middle of the extended part of the outer conductor, so that the holes in the group of these sleeves form a passage channels, all channels, including channels limit the span of the sleeves 11 and 12, attached to the end 2 and 13 radial caps parallel to the axis of coaxial and removed from it at the same distance. In part of the outer conductor, which has a smaller diameter, placed short piston 14 with the contact spring 15 that is moved with the rod 16. Chetyrehjadernyj the resonator needs to be embedded into the block cavities of microwave devices. It is necessary that the main structural elements of the resonators of the block were of the same type. Such structural elements are the dimensions of the outer conductor 1, the intermediate span of the sleeves 7 and 8, the Central bushing 10, the end span of the sleeves 11 and 12. When the unit is in the configuration of the resonator to the frequency of the signal is carried out by moving short piston 14.

An example of a specific implementation chetyrehjadernogo resonator is a laboratory model with internal dimensions of the extended part of the outer conductor with a diameter of 120 mm and a height of 78 mm, as shown in the pictures: Fig. 4 is a top view, Fig. 5, a side view and Fig. 6 - General view.

The experimental dependence of the characteristic impedance at the fundamental harmonic of the length of the piston 14 shown in Fig. 7. Such electrodynamic system has a tuning range from 295 to 370 MHz in all span the channel characteristic impedance in the range from 470 Ohms to 570 Ohm - curve 1. And for the first two gaps formed by the sleeves 12, 7 and 10, it varies from 350 to 400 Ohm - curve 2; and for the second, two gaps formed by sleeves 2, 8 and 10, from 110 to 210 Ohms Ohms curve 3. The dependence of the frequency on movement of porn the key frequency is approximately 20%.

1. Coaxial chetyrehjadernyj resonator span klystron operating in opposite phase with the oscillations of the outer conductor which serves as a housing cavity, made in the form of a hollow metal element, closed on two sides of the end caps attached to the housing end bushings, and inner conductor has the form of a rod connected at one end with an arcuate conductor with two intermediate sleeves, and at the other end with one end cap cavity, and a Central sleeve located between the two intermediate sleeves, is connected to the housing of the resonator short conductor, the length of which is less than a quarter wavelength, so the holes in the group of these sleeves form a single passage channel of the resonator, wherein the resonator is made of multi-channel, and the outer conductor has the form of a hollow metal cylinder with an abrupt change of inner diameter in its middle part, in which there are groups of bushings, forming a passage channels, and the axis of all channels, including channels limit the span of the bushing parallel to the axis of coaxial and removed from it at the same distance, short guides, so in the middle of the extended part of the outer conductor, and the inner conductor is sequentially connected to the groups of intermediate sleeves through arcuate conductors and additional short conductors arranged radially and fixed to the inner end of the conductor.

2. Coaxial chetyrehjadernyj resonator under item 1, characterized in that the arcuate conductors are installed at an angle with respect to short the conductors located radially and fixed to the end of the inner conductor so that the centers of the cross-section of these guides, the most remote from the axis of the coax, lie on a circle passing through the centers of passage channels, and the radial size of the extended part of the outer conductor is selected from the condition

< / BR>
where R1is the radius of the constricted part of the outer conductor, m;

R2is the radius of the extended part of the outer conductor, m;

Lto- short length conductors, fixed in the middle of the extended part of the outer conductor, m;

dW- outer diameter span sleeves, m

3. Coaxial chetyrehjadernyj resonator under item 1, characterized in that part of the outer conductor, which has a smaller diameter, is short piston carried out

 

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