RU2037903C1 - Cavity for non-sine-shaped signal - Google Patents

Abstract

FIELD: microwave devices. SUBSTANCE: two flat edges which are mounted for movement in parallel to caps are introduced to accomplish the goal of invention. Plane of one edge is in perpendicular to plane of side caps of cavity and plane of another edge is parallel to them. It is possible to manufacture one edge as part of ring in order to increase range of main frequency tuning. EFFECT: simplified tuning of cavity to multiple working frequencies. 4 dwg

Description

1-0,83arctg

-2r_l+l;
λ_прот 2 λ_синф, где С₀ емкость двойного бессеточного зазора;
Z₀ волновое сопротивление резонатора;
r_l внешний радиус втулки;
l длина втулки;
d диаметр стержня;
λ_синф. λ_прот длина волны синфазного и противофазного видов колебаний соответственно, т.е. размеры двухзазорного резонатора выбираются по строго определенным соотношениям. Это позволяет возбуждать резонатор на противофазном виде колебаний, длина волны которого в два раза больше длины волны синфазного вида.The invention relates to microwave electronics, and specifically to a device for klystron resonators, and can be used to create amplification and generator devices of this type. The proposed solution is an improvement of the known device [1]
The known resonator for a non-sinusoidal periodic signal contains a housing and a sleeve located inside it, mounted on a rod, the dimensions of which are selected from the following ratios:
d

1-0.83arctg

-2r _l + l;
λ _prot 2 λ _synf , where C _{0 is the} capacity of the double meshless gap;
Z _{0 the} wave impedance of the resonator;
r _{l the} outer radius of the sleeve;
l sleeve length;
d diameter of the rod;
λ _synf . λ _prot wavelength of in-phase and antiphase modes of vibration, respectively, i.e. The dimensions of the double-gap resonator are selected according to strictly defined relations. This allows you to excite the resonator in antiphase mode of oscillation, the wavelength of which is two times the wavelength of the in-phase type.

 The disadvantage of this design is the lack of tuning elements of both the main and doubled frequencies. The resonator tuning is obtained only due to strict adherence to the given geometry. Moreover, any deviations from the dimensions in the manufacture of resonators do not allow to obtain multiple frequencies and there is no way to compensate for the departure of frequencies. In addition, the change in frequency during operation of the resonator is also not adjusted.

 The aim of the invention is to simplify the tuning of the resonator to multiple resonant frequencies.

1-0,83arctg

-2r_l+l;
λ_прот 2 λ_синф, где С₀ емкость двойного бессеточного зазора;
Z₀ волновое сопротивление резонатора;
r_l внешний радиус втулки;
l длина втулки;
d диаметр стержня;
λ_прот, λ_синф длина волны противофазного и синфазного видов колебаний соответственно, снабжен двумя плоскими ребрами, установленными с возможностью перемещения параллельно крышкам, причем плоскость одного ребра расположена параллельно плоскости боковых крышек резонатора, а плоскость другого ребра перпендикулярно. Кроме того, для расширения диапазона перестройки основной частоты одно из ребер выполнено в виде части кольца.The goal is achieved in that the resonator for a non-sinusoidal periodic signal containing a sleeve located inside the housing, mounted on a rod, the dimensions of which are selected from the following relationships:
d

1-0.83arctg

-2r _l + l;
λ _prot 2 λ _synf , where C _{0 is the} capacity of the double meshless gap;
Z _{0 the} wave impedance of the resonator;
r _{l the} outer radius of the sleeve;
l sleeve length;
d diameter of the rod;
λ _prot , λ _synph the wavelength of the out-of-phase and in-phase modes of vibration, respectively, is equipped with two flat ribs mounted with the possibility of moving parallel to the covers, the plane of one rib located parallel to the plane of the side covers of the resonator, and the plane of the other rib perpendicular. In addition, to expand the tuning range of the fundamental frequency, one of the ribs is made as part of a ring.

 The resonator is characterized in that two flat ribs are introduced into it with the possibility of moving parallel to the covers, the plane of one rib being parallel to the plane of the side caps of the resonator, and the plane of the other rib perpendicular. To expand the tuning range of the fundamental frequency, one of the ribs is made as part of a ring. Thus, the inventive dual-gap resonator meets the criterion of "novelty."

 Comparison of the claimed technical solution with the known allowed to establish that the combination of distinctive features provides a dual-gap resonator with the criterion of "significant differences".

 Figure 1 presents an embodiment of a resonator with tuning elements; figure 2 section aa in figure 1; figure 3 is a graph of the change in the fundamental frequency and the doubled frequency depending on the movement of the ribs of the tuning element located perpendicular to the resonator covers; figure 4 shows a graph of the change in the fundamental frequency and doubled frequency depending on the movement of the tuning element, the plane of which is parallel to the resonator covers.

 The resonator is the volume formed by the housing 1 and the side covers 2 with holes 3 for the passage of electrons and placed inside the housing 1 on the rod 4 of the sleeve 5. Into the housing 1 introduced adjustment elements made in the form of flat ribs 6, 7 located parallel and perpendicular to the covers resonator 2.

 When an electron stream passes through the openings 3 of the housing 1 of the resonator, an antiphase type of (main) frequency oscillation is excited in the resonator, which is determined by the distributed capacitance in the high-frequency gaps located between the sleeve 5 and the covers 2 and the inductance of the rod 4. In addition to the antiphase mode of oscillation, there is a common mode type of oscillation, the frequency of which is determined to a first approximation by the inner diameter of the cylinder. The cylinder diameter is chosen so that the frequency of the in-phase mode of oscillation is close to the second harmonic. In this case, the main frequency (antiphase mode of vibration) is selected by changing the diameter of the rod 4 or the surface area of the sleeve 5. To adjust the resonator independently to the frequency of the main mode of vibration and vibration of double frequency, tuning elements are introduced into the resonator body made in the form of two flat thin ribs 6 , 7 located respectively parallel and perpendicular to the caps of the resonator 2. This design of the tuning elements allows for a slight change in the electrodynamic parameters of the resonance ora Q, ρ smoothly in a fairly wide range, independently tune the frequency of the main type of vibrations and vibrations of double frequency. The independence of the action of the adjustment elements is explained by the fact that, as you know, conducting thin planes located in relation to the electromagnetic field of the wave so that the electric lines of force pass normally to their surface, and the magnetic lines of force tangentially do not disturb the fields of this wave. Therefore, if we arrange the flat tuning element so that it individually perturbs the fields of the main mode of vibration, thereby tuning its frequency, while practically not affecting the field of oscillations of the doubled frequency, then we obtain a selective adjustment of the main frequency.

 The same can be done with the oscillation fields at the second harmonic frequency. The field structures of the in-phase and antiphase modes of oscillation are well known, which makes it possible to arrange the tuning elements in the volume so that they act as independently as possible.

 For experimental verification of the action of the tuning elements, a double-gap cylindrical resonator with a volume of 53 x 26 mm and a central sleeve ⌀ 10 x ⌀ 7 x 10 mm mounted on a rod with a diameter of 5 mm was chosen. The resonator caps had span tubes ⌀ 18 x 6.5 x 5 mm. The dependences of the change in the resonance frequencies of the in-phase and antiphase modes of oscillation depending on the depth of immersion in the volume of tuning elements were experimentally measured. Figure 3 shows that the edge, perpendicular to the caps of the resonator, very well shifts the frequency of the out-of-phase vibration mode (by more than 300 MHz), practically without affecting the frequency of the in-phase vibration mode. Figure 4 shows the change associated with the displacement in the volume of a flat rib located parallel to the resonator caps. It is clearly seen that when the frequency of the antiphase mode of vibration changes by more than 250 MHz, the frequency of the in-phase mode of vibration is almost unchanged. In this case, in the resonator, the characteristic resistance for the antiphase mode of oscillation was 250-300 Ohm, for the in-phase mode of oscillation was 150-170 Ohm. When moving the tuning elements to depths of up to 15 mm, the ρ values changed by no more than 5%. For more effective operation of the tuning element of the out-of-phase vibration mode, its shape was chosen so as to maximize the use of the capacitance of the tuning element rib on the central resonator sleeve. The use of trimming elements made in the form of flat ribs located parallel and perpendicular to the resonator caps makes it possible to efficiently and independently tune the frequency of the main type of vibrations and double frequency vibrations in a wide range, which, in turn, extends the functionality of devices based on such resonators without significant complications.

Claims (3)

 1. RESONATOR FOR A NON-SINUSOIDAL SIGNAL, configured to simultaneously excite multiple frequency antiphase and in-phase modes of oscillation, comprising a housing and a sleeve housed therein, which is mounted on the rod and forms a double meshless gap together with the end caps, characterized in that the cavity housing two flat ribs are introduced with the possibility of radial movement, which are mutually perpendicular, while the plane of the rib, intended for tuning the frequency of the antiphase mode of vibration s is disposed parallel to the end caps and edges plane for phase adjustment mode oscillations - perpendicularly to the end caps.  2. The resonator according to claim 1, characterized in that one of the flat ribs is made in the form of part of the ring, which covers the sleeve. 3. The resonator according to claims 1 and 2, characterized in that the thickness t of the ribs is determined from the condition
t _m <t <0.05 λ,
where λ is the wavelength of the corresponding type of oscillation, tunable by another edge, m;
t _m minimum thickness determined by the stability of the ribs to mechanical and thermal loads, m

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