CN217158602U

CN217158602U - Magic T structure

Info

Publication number: CN217158602U
Application number: CN202220938279.8U
Authority: CN
Inventors: 唐小琴; 黄龙娃; 王曙光
Original assignee: Chengdu Oula Microwave Components Co ltd
Current assignee: Chengdu Oula Microwave Components Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-08-09
Anticipated expiration: 2032-04-22

Abstract

The utility model discloses a magic T structure, including a T shape coupling cavity, a main waveguide, two branched waveguides and a load waveguide, set up two coaxial first ports that set up on the T shape coupling cavity, one with first port sets up the second port perpendicularly and one arranges the third port on first port, the second port symmetry axis in, the main waveguide with second port coupling connection, branched waveguide and first port coupling connection, the load waveguide with third port coupling connection, the waveguide intracavity of load waveguide is provided with the absorbent, the waveguide chamber of load waveguide parallels just with the waveguide chamber of branched waveguide the waveguide chamber of load waveguide with the axis in the waveguide chamber of branched waveguide is arranged in on the coplanar. The vertically-arranged load waveguide is optimized to be transversely arranged, so that the height of the magic T can be greatly reduced while the same electrical performance is met.

Description

Magic T structure

Technical Field

The utility model belongs to the technical field of the microwave device, specifically relate to a magic T structure.

Background

With the development of science and technology in China, various systems in the technical field of microwave have higher and higher requirements on power synthesis, and the waveguide magic T is used as an important synthesis/shunt device in microwave and millimeter wave circuits and becomes a second choice for power synthesis in most engineering applications by virtue of the advantages of high power capacity, good port matching, simple structure and the like. With the market trend of miniaturization of each system, the size of the magic T is required to be more miniaturized. The waveguide magic T is a four-port element which meets impedance matching through an internal matching structure on the basis of E-T and H-T joints.

The existing waveguide magic T adopts a structure shown in fig. 2 in an invention patent 'broadband millimeter wave hybrid waveguide magic T power divider/synthesizer' with application number '202110337946.7', and comprises a T-shaped coupling cavity, a main waveguide, a branch waveguide arranged perpendicular to the main waveguide, and a load waveguide arranged perpendicular to the main waveguide and the branch waveguide at the same time, wherein an absorber is arranged at the top of a waveguide cavity of the load waveguide, namely the waveguide cavity of the load waveguide is perpendicular to the waveguide cavities of the main waveguide and the branch waveguide, as shown in fig. 1 in the application.

With the above structure, there are the following problems:

in order to ensure that the waveguide magic T has ideal electrical indexes, the waveguide cavity of the load waveguide needs to have a certain height, and the magic T is higher in height by adopting the structure and is not suitable for being used in environments with higher requirements on volume.

SUMMERY OF THE UTILITY MODEL

In order to solve the waveguide chamber that current magic T adopted load waveguide and the waveguide chamber of main waveguide, branch waveguide leads to the high problem of magic T whole height mutually perpendicularly, the utility model provides a magic T structure, its height that can reduce magic T greatly.

The utility model discloses a following technical scheme realizes:

the utility model provides a magic T structure in a first aspect, which comprises a T-shaped coupling cavity, a main waveguide, two branch waveguides and a load waveguide, wherein the T-shaped coupling cavity is provided with two coaxial first ports, a second port vertical to the first port and a third port arranged on the symmetrical axes of the first port and the second port, the main waveguide is coupled with the second port, the branch waveguides are coupled with the first port, the load waveguide is coupled with the third port, an absorber is arranged in the waveguide cavity of the load waveguide,

the waveguide cavity of the load waveguide is parallel to the waveguide cavity of the branch waveguide, and the waveguide cavity of the load waveguide and the waveguide cavity of the branch waveguide are arranged on the same plane.

This scheme is through improving load waveguide's position, is about to optimize vertical load waveguide who sets up for horizontal setting, when satisfying the same electrical property, can reduce magic T's height greatly. It should be noted here that the vertical direction and the horizontal direction are both relative to the plane where the main waveguide and the branch waveguide are located.

In one possible design, there is one of the load waveguides.

In one possible design, there are two of the loading waveguides.

In one possible design, the two load waveguides are symmetrically arranged, and the symmetry axes of the two load waveguides are on the same plane with the symmetry axes of the first port and the second port.

In order to ensure that the waveguide magic T has ideal electrical indexes, the waveguide cavity of the loading waveguide needs to have a certain length, and when only one loading waveguide is adopted, the length of the loading waveguide is inevitably long, so that although the height of the magic T can be reduced, the width is increased to a certain extent. Preferably, two load waveguides are arranged, so that the burden on the width direction is reduced, and the width of the magic T is greatly reduced. And by adopting the magic T with the structure, the volume of the absorber in the load waveguide cavity is reduced, and the absorber can be formed by cutting residual materials of the load absorber used at ordinary times, so that the utilization rate of the load absorber is improved, and the production cost is further saved.

In one possible design, a matching stage for standing wave matching is provided within the waveguide cavity of the loading waveguide. When the standing wave matching of the device is not good, the matching platform is arranged in the waveguide cavity, so that the standing wave matching is realized, and the performance of the device is improved.

Compared with the prior art, the utility model, following advantage and beneficial effect have at least:

1. the utility model discloses optimize the load waveguide of vertical setting for horizontal setting, when satisfying the same electrical property, can reduce magic T's height greatly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a conventional magic T;

fig. 2 is a schematic diagram of a structure of an embodiment of the magic T of the present invention;

fig. 3 is a schematic diagram of another embodiment of the magic T of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments of the present invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.

It should be understood that, for the term "and/or" as may appear herein, it is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time; for the term "/and" as may appear herein, which describes another associative object relationship, it means that two relationships may exist, e.g., a/and B, may mean: a exists independently, and A and B exist independently; in addition, with respect to the character "/" which may appear herein, it generally means that the former and latter associated objects are in an "or" relationship.

It should be understood that specific details are provided in the following description to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may not be shown in unnecessary detail to avoid obscuring the examples.

Example 1

A magic T structure comprises a T-shaped coupling cavity, a main waveguide 2, two branch waveguides 1 and a load waveguide 4, wherein two first ports are coaxially arranged on the T-shaped coupling cavity, a second port is vertically arranged on the first port, and a third port 3 is arranged on the symmetrical axis of the first port and the second port, the main waveguide 2 is in coupling connection with the second port, the branch waveguides 1 are in coupling connection with the first port, the load waveguide 4 is in coupling connection with the third port 3, and an absorber 5 is arranged in a waveguide cavity 41 of the load waveguide 4. The main waveguide, the branch waveguide and the T-shaped coupling cavity are arranged as same as the existing structure, and the T-shaped coupling cavity, the main waveguide and the branch waveguide can adopt the existing E-surface T-shaped branch structure and can also adopt an H-surface T-shaped branch structure. The main waveguide, the branch waveguide and the load waveguide are all rectangular waveguides, namely the waveguide cavity sections of the main waveguide, the branch waveguide and the load waveguide are rectangular.

The structure of the load waveguide and the absorber placed in the waveguide cavity of the load waveguide is also the same as the existing structure. Magic T structure lies in with current structure difference: the existing vertically-arranged load structure is optimized to be transversely arranged, namely the waveguide cavity of the load waveguide is parallel to the waveguide cavity of the branch waveguide, and the waveguide cavities of the load waveguide and the branch waveguide are arranged on the same plane along the axis.

When the structure is sampled, when the standing wave matching is not good, a matching platform 6 for the standing wave matching can be arranged in the waveguide cavity of the load waveguide. A matching stage 6 is placed in a relative position to the third port 3.

Example 2

The present embodiment discloses a specific structure on the basis of any structure in embodiment 1, that is, as shown in fig. 2, the specific structure includes a T-shaped coupling cavity, a main waveguide 2, two branch waveguides 1, and a load waveguide 4, the T-shaped coupling cavity is provided with two coaxially disposed first ports, a second port perpendicular to the first ports, and a third port 3 disposed on the symmetry axis of the first ports and the second ports, the main waveguide 2 is coupled to the second ports, the branch waveguides 1 are coupled to the first ports, the load waveguide 4 is coupled to the third ports, absorbers 5 are disposed in waveguide cavities 41 of the load waveguide 4, and only one load waveguide is disposed.

One end of the waveguide cavity of the load waveguide is connected with the load port, the other end of the waveguide cavity of the load waveguide is a closed end, an absorber is arranged in the closed end, the waveguide cavity of the load waveguide and the waveguide cavity of the branch waveguide are arranged in parallel, and the axes of the two waveguide cavities are on the same plane.

Example 3

The present embodiment discloses a specific structure on the basis of any structure in embodiment 1, that is, as shown in fig. 3, the specific structure includes a T-shaped coupling cavity, a main waveguide, two branch waveguides and a load waveguide, the T-shaped coupling cavity is provided with two coaxially disposed first ports, a second port perpendicular to the first ports, and a third port disposed on the symmetry axis of the first ports and the second ports, the main waveguide is coupled with the second ports, the branch waveguides are coupled with the first ports, the load waveguide is coupled with the third port, absorbers 5 are disposed in waveguide cavities 41 of the load waveguides 4, and there are 2 load waveguides. The waveguide cavity of the load waveguide and the waveguide cavity of the branch waveguide are arranged in parallel, and the axes of the two waveguide cavities are on the same plane. Specifically, the two load waveguides are symmetrically arranged, and the symmetry axes of the two load waveguides, the first port symmetry axis and the second port symmetry axis are on the same plane.

As shown in fig. 3, two load waveguides are disposed in parallel with the two branch waveguides, respectively. By adopting the structure, the height of the magic T is reduced, and meanwhile, no burden is brought to the length. One end of the loaded waveguide is coupled to the third port and the other end is also closed, with the absorber disposed within the closed end.

By adopting the structure shown in fig. 3 and the ideal matching magic T, when a TE10 wave is input from a main waveguide of the magic T, an H arm is connected with a matching load waveguide, a port of the main waveguide outputs two opposite paths of signals with equal amplitude, and the H arm does not output signals and does not reflect; when TE10 waves are input from the main waveguide of the magic T, the E arm is connected with the matched load waveguide, two paths of signals with the same amplitude and the same direction are output from the port of the main waveguide, and no signal is output and no reflection is generated by the E arm.

According to the traditional magic T matched load, as shown in figure 1, a load waveguide is directly arranged at a third port, after TE10 waves are matched and absorbed by the load waveguide, no signal is output from the port and no reflection exists, but the matched load waveguide occupies a large space. To reduce the occupied space, the loaded waveguide is compressed in size, and changed into two small loaded waveguides from one loaded waveguide directly added into the third port, as shown in fig. 3. Since the port does not need a signal output, the load after compression does not affect the distribution or synthesis of the signal in the main arm as long as the load is sized.

Taking BJ32 magic T as an example, in the case that all the waveguide cavities reach the ideal electrical specification, the structure shown in fig. 1 is adopted, and the waveguide cavity of the loading waveguide is vertically coupled to the third port of the T-shaped coupling cavity, and at this time, the height L1 of the magic T is 166.4 mm. With the structure shown in fig. 3 in this embodiment, the waveguide cavity of the loading waveguide is arranged horizontally, i.e. parallel to the branch waveguide, and at this time, the height of the magic T can be compressed to 66.4 mm. Through the contrast of the two structures, under the condition that the ideal electrical index is achieved, the structure of the scheme can greatly compress the height of the magic T, obviously improve the space utilization rate and enable the magic T to have a wider use environment. And when 2 load waveguides are adopted, the size of the absorber in each load waveguide is reduced, the absorber can be formed by cutting the residual materials of the commonly used load absorbers, the utilization rate of the load absorbers is improved, and the production cost is further saved.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: modifications may be made to the embodiments described above, or equivalents may be substituted for some of the features described. Such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. A magic T structure comprises a T-shaped coupling cavity, a main waveguide, two branch waveguides and a load waveguide, wherein the T-shaped coupling cavity is provided with two coaxially arranged first ports, a second port which is vertical to the first ports and a third port which is arranged on the symmetrical axes of the first ports and the second ports, the main waveguide is coupled with the second ports, the branch waveguides are coupled with the first ports, the load waveguide is coupled with the third ports, and absorbers are arranged in the waveguide cavity of the load waveguide,

2. A magic T structure as claimed in claim 1, wherein there is one of the load waveguides.

3. A magic T structure as claimed in claim 1, wherein there are two of the loading waveguides.

4. A magic T structure as claimed in claim 3, wherein the two load waveguides are symmetrically arranged and the axes of symmetry of the two load waveguides are in the same plane as the axes of symmetry of the first and second ports.

5. A magic T structure as claimed in claim 1, wherein the main, branch and load waveguides are rectangular waveguides.

6. A magic T structure as claimed in claim 1, wherein the waveguide cavity of the loading waveguide is provided with a matching platform for standing wave matching.

7. A magic T structure as claimed in claim 1, wherein the magic T structure is BJ32 magic T, the height of which is 60 to 70 mm.

8. A magic T structure as claimed in claim 7, characterised in that the height of the magic T structure is 66.4 mm.