RU176239U1 - Waveguide slit bridge - Google Patents

Abstract

, где λ₀ - длина волны в свободном пространстве. В волноводном щелевом мосте выполнен вдоль средней линии участка сдвоенного волновода прямоугольный выступ. Технический результат - уменьшения температуры нагрева при передаче высокого уровня средней мощности в волноводном щелевом мосте. 2 ил.

The utility model relates to the field of radio engineering, in particular to waveguide slotted bridges. The waveguide slit bridge contains two rectangular waveguides with a common narrow wall and a slit whose height is equal to the height of the rectangular waveguide, and the portion of the dual waveguide formed by them, and the size of each of its wide walls is chosen from the condition that

where λ ₀ is the wavelength in free space. In the waveguide slotted bridge, a rectangular protrusion is made along the midline of the dual waveguide portion. EFFECT: reduction of the heating temperature during transmission of a high level of average power in a waveguide slot bridge. 2 ill.

Description

The proposed utility model relates to the field of radio engineering, in particular to microwave technology, and can be used in waveguide paths and devices for dividing or adding signals, for example, in waveguide phase circulators.

Known waveguide slotted bridge (RU 94061 U1, publ. 05/10/2010 IPC Н01Р 5/18) containing two rectangular waveguides having a common narrow wall with a slit whose height is equal to the height of a rectangular waveguide, a double section of rectangular waveguides. On one of the wide walls of a double section of a rectangular waveguide at the intersection of the axes of symmetry is a capacitive matching element. Capacitive matching element is made in the form of a spherical segment on one or both wide walls of a double waveguide.

The disadvantages of the known waveguide slot bridge are the high heating temperature of the tuning element and the adjacent walls of the dual waveguide portion when transmitting a high level of average power.

. В средней части широкой стенки волновода имеется винт, с помощью которого производится подстройка моста.The closest in technical essence to the proposed one is the waveguide slot bridge (A.L. Mikaelyan. Theory and application of ferrites at microwave frequencies. Gosenergoizdat, Moscow, Leningrad, 1963, pp. 563-565, Fig. 10-40; 10- 41). It contains two rectangular waveguides with a common narrow wall, a slit made in it to the full height of the waveguide, and a portion of a double waveguide formed by them with the size of wide walls

. In the middle part of the wide wall of the waveguide there is a screw with which the bridge is adjusted.

This waveguide slot bridge requires the introduction of additional tuning elements that cause local concentration of the electromagnetic field and currents on them and the walls of the waveguide near the tuning elements and heating at a high average power level.

The objective of the claimed utility model is to reduce losses and heating temperatures of the slotted bridge.

The technical result of the proposed waveguide slot bridge is to achieve the possibility of reducing the temperature of its heating during transmission of a high level of average power.

,The essence of the proposed utility model is that it contains two rectangular waveguides with a common narrow wall and a slit whose height is equal to the height of the rectangular waveguide, and the section of the doubled waveguide formed by them, and the size of each of its wide walls is chosen from the condition that

,

where λ ₀ , the wavelength in free space,

- размер широкой стенки участка сдвоенного волновода.

- the size of the wide wall of the dual waveguide.

New in the inventive waveguide slit bridge is the implementation along the midline of the plot of the dual waveguide protrusion of a rectangular shape.

In FIG. 1 presents an example of the design of the proposed waveguide slotted bridge,

In FIG. 2 - distribution of the electric field of the waves H ₁₀ and H ₂₀ in the area of the dual waveguide.

The waveguide slot bridge contains two segments of rectangular waveguides 1, their common narrow wall 2, slot 3, a section of a dual waveguide 4, a protrusion of a rectangular shape 5.

To consider the operation of the inventive waveguide slot bridge, we conventionally designate four channels in it: the first channel I is the input of one rectangular waveguide, the second channel II is the input of another rectangular waveguide (adjacent to the first (I) channel), the third channel III is the output of the first (I) a rectangular waveguide, the fourth channel IV is the output of the second (II) rectangular waveguide (adjacent to the third (III) channel). The electromagnetic wave field, which came, for example, from channel I, excites 4 waves of two types in the dual waveguide section: H ₂₀ and H ₁₀ . At the entrance to the section of the dual waveguide 4 in the plane of its interface with the first (I) and second (II) channels, at the site of the first (I) channel, waves H ₁₀ and H _{20 are in} -phase, and at the site of the second (II) channel they are in-phase. The propagation velocity of the H ₁₀ wave along the portion of the dual waveguide 4, the wavelength and the size of the phase incursion are determined by the dimensions of its wide walls and the size of the protrusion 5, made along the midline of one of them and located at the maximum of the H ₁₀ wave field. When the size of the protrusion of rectangular shape 5 is much smaller than the transverse dimensions of the portion of the dual waveguide, the propagation speed of the H ₂₀ wave (along the portion of the dual waveguide 4), its length and phase advance are determined only by the size of its wide wall and are practically independent of the presence of the protrusion of rectangular shape 5 located in the minimum field of the wave N ₂₀ . The ratio of the amplitudes of the waves H ₁₀ and H ₂₀ at the input of the section of the dual waveguide 4 is determined by the boundary conditions on its narrow walls and the distribution of their fields and is E _H10 / E _H20 = 0.75. The choice of the length of the slit 3 in the narrow wall 2 and the size of the protrusion of a rectangular shape 5, made along the midline of one of the wide walls of the section of the dual waveguide 4, ensures equal amplitudes and phase difference plus 90 ° between the waves H ₁₀ and H ₂₀ at the output of the third channel III and equality of amplitudes and phase difference minus 90 ° - at the input of channel IV. As a result of the addition of the fields of these waves in the third (III) and fourth (IV) channels, H ₁₀ waves are excited with equal amplitudes and phase shifted by 90 °.

A rectangular protrusion made along the midline of one of the walls of the dual waveguide section along its entire length acts on the H ₁₀ wave field along the entire length of the dual waveguide section, which minimizes the field concentration and local increase in currents necessary for leveling the amplitudes (as on inhomogeneities ) and on the walls of the waveguide and reduces their heating. In addition, when performing a protrusion of a rectangular shape along the midline of a portion of a dual waveguide, the critical wavelength increases and its operating frequency range for wave H ₁₀ extends, thereby expanding the operating frequency range of the waveguide slot bridge.

Claims (1)

A waveguide slit bridge containing two rectangular waveguides with a common narrow wall and a slit whose height is equal to the height of a rectangular waveguide, and the portion of a double waveguide formed by them with the size of wide walls

, characterized in that along the middle line of the plot of the dual waveguide is made a protrusion of a rectangular shape.

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