RU94061U1 - WAVEGUIDE-SLOT H-BRIDGE - Google Patents

Abstract

 A waveguide-slot H bridge 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 which there is a capacitive matching element at the intersection of the axes of symmetry, characterized in that the capacitive matching element is made in the form of a spherical segment on one or both wide walls of the dual waveguide.

Description

The proposed utility model relates to radio engineering, in particular to microwave devices and can be used for dividing or summing microwave power.

Known waveguide-slot bridge (SU 1578779 A1 publ. 07.15.1990), containing two rectangular waveguides with the same cross sections connected through a slot in a common wide wall. The width of the gap is equal to the width of the common wall. The length of the slit, the width of the common wall and the width of the waveguides are connected by predetermined relations.

Its disadvantage is the inevitability of the excitation and propagation of higher types of waves, which excludes the possibility of use in such devices as, for example, phase circulators, switches.

The closest in technical essence is the "slotted directional coupler with 3-decibel coupling (Vambersky MV Abramov VP, Kazantsev VI" Design of microwave ferrite decoupling devices ", Moscow" Radio and communication "1982, pp. .59-61, Fig.2.19, 2.20a), which is a dual waveguide with a common narrow wall, part of which is removed. Due to this, a double waveguide and a communication region (gap) are formed. Its coordination is achieved by choosing the width of the double waveguide (in the H-plane), the length of the communication region (gap) and installing a capacitive pin on one of the wide walls of the double waveguide in the communication region, with the axis in the plane of a common narrow wall.

Its disadvantage is the reduction in electric strength due to the high degree of heterogeneity and field concentration on the capacitive pin, and for large values of average and continuous power and heating of the capacitive pin and the adjacent portion of the wide wall of the double waveguide induced by surface microwave currents.

The technical result of the proposed waveguide-slot H-bridge is to increase its electrical strength.

The essence of the proposed utility model is that the waveguide-slotted H-bridge contains 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 whose wide walls, at the intersection of the axes of symmetry located capacitive matching element.

New in the proposed utility model is that the capacitive matching element is made in the form of a spherical segment on one or both wide walls of a double waveguide.

Figure 1 shows the design of the proposed waveguide-slot H-bridge.

The proposed waveguide-slotted H-bridge consists of two rectangular waveguides 1, 2 with a common narrow wall 3, slot 4, a double section 5 of rectangular waveguides 1 and 2, matching element 6.

The waveguide-slot H-bridge operates as follows: upon excitation of the waveguide-slot H-bridge at the input of a rectangular waveguide 1 by a wave of H ₁₀ in a double section of 5 rectangular waveguides 1 and 2, waves of H ₁₀ and H ₂₀ approximately equal in amplitude are excited. Moreover, at the beginning of the doubled section 5 from the side of the rectangular waveguide 1, they are in phase, and at the beginning of the doubled section from the side of the rectangular waveguide 2 are out of phase.

When the amplitudes and antiphase of the waves H ₁₀ and H _{20 are} equal, the rectangular waveguide 2 is not excited. In the doubled section of 5 rectangular waveguides 1 and 2, the phase velocities of the waves H ₁₀ and H _{20 are} different (V _ФН20 > V _ФН10 ).

The choice of the length of the slit L is carried out from the condition Where

φ _H20 - the phase incursion of the wave N ₂₀

φ _H10 - the phase incursion of the wave H ₁₀

In this case, at the output of the waveguide slotted H-bridge in rectangular waveguides 1 and 2, Nu waves are excited whose amplitudes are equal, and their phases are shifted by At the beginning and end of the double section 5 of the rectangular waveguides 1 and 2, inhomogeneities arise. This leads to a decrease in the degree of mutual suppression (compensation) of the waves in the rectangular waveguide 2 adjacent to the exciting rectangular waveguide 1, to the inequality of amplitudes and the difference in phase difference from at the outputs of these waveguides, an increase in the SWR of the input of the exciting rectangular waveguide 1. To minimize these phenomena, a capacitive tuned element in the form of a spherical segment is installed on the wide wall of the doubled section 5 of rectangular waveguides 1 and 2, in the plane of a common narrow wall. It minimizes the degree of heterogeneity and concentration of the electric field near the tuning element, allows you to maintain the integrity of the material and reduces overheating of the tuning element and the walls of the waveguide-slot H-bridge caused by microwave currents at a high power level, especially when installing 2 spherical segments - one at a time not both wide walls of a dual waveguide, as this allows to reduce the size of each of them. All this increases the electrical strength of the proposed waveguide-slot H-bridge.

Claims (1)

A waveguide-slot H bridge 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 which there is a capacitive matching element at the intersection of the axes of symmetry, characterized in that the capacitive matching element is made in the form of a spherical segment on one or both wide walls of the dual waveguide.