Waveguide isolator

Abstract

The present application relates to a kind of waveguide isolators, including upper cavity component, lower cavity component and absorption component;The lower cavity component has first branch cavity, second branch cavity and third branch cavity, and the first branch cavity, the second branch cavity and the third branch cavity each one end portion are communicated with each other and the other end portion is towards different direction;The third branch cavity end portion is provided with first guide part and the microwave signal is guided to the upper cavity component, the upper cavity component is provided with guide component and the microwave signal is guided to the absorption component, and the absorption component is arranged in the upper cavity component;The absorption component includes at least one absorber, and the absorber is installed in the upper cavity component.The present application can effectively improve the space utilization of waveguide isolator, and has good sealing and heat dissipation, and high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microwave devices, in particular to a waveguide isolator. BACKGROUND

[0002] Isolator can transmit signal in one direction, also known as one-way device, which has a wide application in radar technology. The isolator in radar has two main functions, one is used in the output end of high power source, which plays a role of matching output and absorbing reflected echo, stabilizing and protecting the transmitting tube, the other is used in the interstage of amplification chain to play a role of isolation and decoupling, preventing interstage interference. Compared with coaxial and strip line isolators, waveguide isolator has lower attenuation loss and larger power capacity. However, with the development of waveguide isolator, its disadvantages of larger size, higher sealing and heat dissipation requirements are gradually revealed.

[0003] Therefore, the technical personnel in the art are committed to developing a waveguide isolator to improve the space utilization of the waveguide isolator, and the waveguide isolator has good sealing and heat dissipation properties and high reliability. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a waveguide isolator to improve the space utilization of the waveguide isolator, and the waveguide isolator has good sealing and heat dissipation properties and high reliability.

[0005] The technical solution of the present application to solve the above technical problem is as follows: a waveguide isolator, comprising an upper cavity assembly, a lower cavity assembly and an absorption assembly;

[0006] The lower cavity assembly has a first branch cavity, a second branch cavity and a third branch cavity, and the first branch cavity, the second branch cavity and the third branch cavity are connected to each other at one end and face different directions at the other end;

[0007] The third branch cavity is provided with a first guide portion to guide the microwave signal into the upper cavity assembly, the upper cavity assembly is provided with a guide assembly to guide the microwave signal to the absorption assembly, and the absorption assembly is arranged in the upper cavity assembly;

[0008] The absorption assembly comprises at least one absorber, and the absorber is mounted in the upper cavity assembly.

[0009] The beneficial effects of the present application are: the microwave signal enters the isolator from the first branch cavity and is guided out from the second branch cavity, the reverse microwave signal enters the third branch cavity and is guided to the upper cavity assembly through the guide portion, and the reverse microwave signal is absorbed through the guide assembly and the absorption assembly, thereby decoupling, preventing interstage interference, improving the space utilization of the waveguide isolator, and having good sealing and heat dissipation properties and high reliability.

[0010] On the basis of the above technical solution, the present application can also be improved as follows.

[0011] Further, an isolation plate is arranged between the upper cavity assembly and the lower cavity assembly, and the isolation plate is provided with a communication hole for transmitting the reverse microwave signal.

[0012] The isolation plate separates the upper cavity assembly and the lower cavity assembly, and the communication hole transmits the reverse microwave signal to the absorption assembly.

[0013] Further, the guide assembly comprises a second guide part arranged on the side wall of the upper cavity assembly.

[0014] The second guide part is used for guiding the reverse microwave signal to the absorption assembly.

[0015] Further, the isolation plate is provided with a first mounting hole, the first mounting hole is provided with a mounting boss, a first permanent magnet is clamped and mounted in a mounting cavity of the mounting boss, and a baffle is further mounted on the mounting boss.

[0016] The permanent magnet is used to provide a magnetic field.

[0017] Further, the absorption body is arranged directly above the baffle, the absorption body has a longitudinal section in the shape of a right-angled trapezoid, a tip of the absorption body faces the guide assembly, and a side edge of the absorption body abuts against the inside of the upper cavity assembly.

[0018] The absorption assembly further comprises an absorption sheet, and the absorption sheet is obliquely arranged in the upper cavity assembly.

[0019] The absorption body has the shape of a right-angled trapezoid, which can be adjusted to the shape of a right-angled triangle in actual use, and the absorption body is mainly used for absorbing and consuming the reverse microwave signal.

[0020] Further, the absorption assembly further comprises a plurality of ferrite bodies, the plurality of ferrite bodies are separated by a dielectric sheet, the ferrite bodies are arranged in the lower cavity assembly, and the ferrite bodies are arranged directly below the first mounting hole.

[0021] The ferrite bodies are used for microwave directional transmission, and the dielectric sheet not only supports the ferrite bodies and prevents sparking (i.e. air breakdown) between two ferrite bodies, but also buffers and reduces the pressure of the ferrite bodies.

[0022] Further, the lower cavity assembly is provided with a second mounting hole at the bottom, a second permanent magnet is arranged in the second mounting hole through a second baffle, and the second permanent magnet is arranged directly below the second mounting hole.

[0023] The permanent magnet is used to provide a magnetic field.

[0024] Further, the isolation plate bottom is provided with a first boss, and the lower cavity assembly is provided with a second boss corresponding to the first boss.

[0025] Further, the first branch cavity and the second branch cavity are both provided with a connecting flange, and the connecting flange is provided with a closed-loop sealing groove, and the sealing groove is provided with a sealing ring.

[0026] The connecting flange is used for connecting the isolator with other components, the sealing ring and the sealing groove enhance the sealing between the connecting flange and other components, the power capacity of the isolator is improved, and liquid such as rainwater is prevented from flowing in.

[0027] Further, the upper end surface of the upper cavity assembly is provided with a heat dissipation fin.

[0028] The heat dissipation fin improves the heat dissipation performance of the isolator. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structure schematic diagram of a specific embodiment of the present application;

[0030] Figure 2 It is an explosion structure schematic diagram of a specific embodiment of the present application;

[0031] Figure 3 It is an explosion structure schematic diagram of a specific embodiment of the present application;

[0032] Figure 4 It is an isolation plate mounting structure schematic diagram of a specific embodiment of the present application;

[0033] Figure 5 It is a plane structure schematic diagram of a specific embodiment of the lower cavity assembly.

[0034] In the drawings, the components represented by the numbers are listed as follows:

[0035] 1, upper cavity assembly; 2, lower cavity assembly; 3, first branch cavity; 4, second branch cavity; 5, third branch cavity; 6, first guide part; 7, guide assembly; 8, isolation plate; 9, communication hole; 10, absorbing sheet; 11, first mounting hole; 12, first permanent magnet; 13, baffle; 14, absorber; 15, ferrite; 16, dielectric sheet; 17, second mounting hole; 18, second permanent magnet; 19, second baffle; 20, first boss; 21, second boss; 22, connecting flange; 23, sealing groove; 24, heat dissipation fin. DETAILED DESCRIPTION

[0036] The principles and features of the present application are described below in conjunction with the accompanying drawings, in which the examples are used to explain the present application and are not intended to limit the scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "length", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the system or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , a waveguide isolator includes an upper cavity assembly 1, a lower cavity assembly 2 and an absorption assembly; the lower cavity assembly 2 has a first branch cavity 3, a second branch cavity 4 and a third branch cavity 5, and the first branch cavity 3, the second branch cavity 4 and the third branch cavity 5 are communicated with each other at one end and are directed in different directions at the other end; the third branch cavity 5 is provided with a first guide portion 6 to guide the microwave signal into the upper cavity assembly 1, the upper cavity assembly 1 is provided with a guide assembly 7 to guide the microwave signal to the absorption assembly, and the absorption assembly is arranged in the upper cavity assembly 1; the absorption assembly includes at least one absorber 14, and the absorber 14 is mounted in the upper cavity assembly 1.

[0041] In the present application, the microwave signal enters the isolator from the first branch cavity 3 and is guided out from the second branch cavity 4, the reverse microwave signal enters the third branch cavity 5 and is guided into the upper cavity assembly 1 through the first guide portion 6, and the reverse microwave signal is absorbed through the guide assembly 7 and the absorption assembly, thereby decoupling, preventing inter-stage interference, improving the space utilization of the waveguide isolator, and having good sealing and heat dissipation properties, and high reliability.

[0042] In some embodiments, the first branch cavity 3, the second branch cavity 4 and the third branch cavity 5 combine into a Y-shaped structure, and the first branch cavity 3 and the second branch cavity 4 are symmetrical along the center line of the third branch cavity 5. An isolation plate 8 is further arranged between the upper cavity assembly 1 and the lower cavity assembly 2, and the upper cavity assembly 1, the lower cavity assembly 2 and the isolation plate 8 are connected by bolts or welding, and a sealing groove and a sealing ring are arranged at the connection position, so as to ensure the sealing between the upper cavity assembly 1, the isolation plate 8 and the lower cavity assembly 2. The isolation plate 8 has a communication hole 9 for microwave transmission, which is rectangular for communication between the upper cavity assembly 1 and the lower cavity assembly 2, so that the microwave is transmitted from the lower cavity assembly 2 to the upper cavity assembly 1.

[0043] In another embodiment, the first branch cavity 3 and the second branch cavity 4 are both provided with a connecting flange 22 at the end, and the connecting flange 22 is welded with the end of the first branch cavity 3 and the second branch cavity 4 to ensure the sealing of the lower cavity assembly 2. The connecting flange 22 is provided with a plurality of uniformly distributed connecting holes for connecting other parts. The connecting flange 22 is provided with a closed sealing groove 23 on the side, and a sealing ring is arranged in the sealing groove 23, so that the connecting flange 22 has good airtightness when connected with other parts.

[0044] In the embodiment, the upper cavity assembly 1 is trapezoidal, and the guide assembly 7 includes a second guide part which is arranged on the side wall of the upper cavity assembly 1. In order to enhance the heat dissipation effect of the upper cavity assembly 1, the upper end surface of the upper cavity assembly 1 is further provided with a heat dissipation fin 24 which is made of copper alloy or other materials with good heat conductivity and is fixedly connected with the upper end surface of the upper cavity assembly 1 to improve the heat dissipation capacity of the device and avoid the device failure caused by the high temperature rise of the absorbing sheet 10 under high power condition.

[0045] In some embodiments, the isolation plate 8 is provided with a first mounting hole 11, which is circular, and has a mounting boss inside. The first permanent magnet 12 is clamped and mounted in the mounting cavity of the mounting boss. The mounting boss is further provided with a baffle 13. Specifically, the mounting boss has a cylindrical mounting cavity in the middle, and the first permanent magnet 12 is clamped and mounted in the cylindrical mounting cavity. The upper surface of the first permanent magnet 12 is lower than or on the same plane as the surface of the mounting boss. The mounting boss is provided with a threaded hole, and the connecting bolt passes through the baffle 13 and is connected with the threaded hole, so as to fix the first permanent magnet 12 in the mounting boss. The baffle 13 is mounted on the surface of the mounting boss to protect the first permanent magnet 12. The first permanent magnet 12 is used to provide a magnetic field. The bottom of the isolation plate 8 is provided with a first boss 20, which is Y-shaped. The lower cavity assembly 2 is provided with a second boss 21 corresponding to the first boss 20, which is also Y-shaped. The first boss 20 and the second boss 21 are used to adjust the impedance matching. In the embodiment, the free end of the first boss 20 and the second boss 21 can be rounded, which can effectively avoid the damage of the device caused by the internal sparking (i.e. air breakdown) under high power conditions. At the same time, since the connecting flange 22 is provided with a sealing ring to make the device cavity closed for inflation and pressurization, and the upper cavity assembly 1 is provided with a heat dissipation fin 24, the free end of the first boss 20 and the second boss 21 is provided with a round corner, so as to further improve the power capacity of the device and meet the use conditions of high power.

[0046] In another embodiment, the absorption assembly includes at least one absorption body 14. In this embodiment, two absorption bodies 14 of the same structure are provided, which are stacked together. The absorption body 14 is mounted in the upper cavity assembly 1 and located directly above the baffle 13. In this embodiment, the longitudinal section of the absorption body 14 is a right-angled trapezoid. In other embodiments, the longitudinal section of the absorption body 14 can be a trapezoid, a right-angled triangle, etc., which can achieve the same technical effect. The tip of the absorption body 14 faces the guide assembly 7, and the side edge of the absorption body 14 abuts against the inside of the upper cavity assembly 1. The absorption assembly includes an absorption sheet 10, which is obliquely mounted in the upper cavity assembly 1, i.e. the absorption sheet 10 is mounted on the inclined surface of the trapezoid and abuts against the second guide portion. The absorption sheet 10 is in front of and behind the absorption body 14, which improves the absorption effect of the reverse microwave signal and further improves the isolation of the waveguide isolation device. In the embodiment, the absorption sheet 10 is pasted to the inner surface of the upper cavity assembly 1 by an adhesive. The absorption sheet 10 is used to preliminarily absorb the reverse microwave signal.

[0047] The absorbing assembly further comprises two ferrite 15 in the shape of a cylinder, which are used for microwave directional transmission. Specifically, the ferrite 15 are separated by a dielectric sheet 16, and the ferrite 15 and the dielectric sheet 16 are arranged in sequence. In the embodiment, the dielectric sheet 16 can be made of polytetrafluoroethylene or the like, which can not only support the ferrite 15 and prevent the two ferrite 15 from sparking (i.e. air breakdown), but also serve to buffer the ferrite 15 from pressure and prolong the service life of the ferrite 15. The ferrite 15 is located in the lower cavity assembly 2, and the ferrite 15 is located directly below the first mounting hole 11 and coaxial with the first permanent magnet 12.

[0048] The lower cavity assembly 2 has a second mounting hole 17 at the bottom, which passes through the second boss 21. The second permanent magnet 18 is installed in the second mounting hole 17 through the second baffle 19, and the second permanent magnet 18 is located directly below the second mounting hole 17. The second permanent magnet 18 is coaxial with the ferrite 15, and a partition is arranged between the second permanent magnet 18 and the ferrite 15.

[0049] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0050] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A waveguide isolator, characterized by: The device comprises an upper cavity assembly (1), a lower cavity assembly (2) and an absorption assembly; The lower cavity assembly (2) has a first branch cavity (3), a second branch cavity (4) and a third branch cavity (5), the first branch cavity (3), the second branch cavity (4) and the third branch cavity (5) are communicated with each other at one end and are directed to different directions at the other end; The third branch cavity (5) is provided with a first guide part (6) at the end to guide the microwave signal into the upper cavity assembly (1), the upper cavity assembly (1) is provided with a guide assembly (7) to guide the microwave signal to the absorption assembly, and the absorption assembly is arranged in the upper cavity assembly (1); The absorption assembly comprises at least one absorption body (14) which is installed in the upper cavity assembly (1); The upper cavity assembly (1) and the lower cavity assembly (2) are further provided with a partition plate (8); The partition plate (8) is provided with a first mounting hole (11) having a mounting boss, a first permanent magnet (12) is clamped and mounted in the mounting cavity of the mounting boss, and a baffle (13) is further mounted on the mounting boss; The absorption body (14) is located directly above the baffle (13).

2. The waveguide isolator of claim 1, wherein: The partition plate (8) is provided with a communication hole (9) for reverse microwave signal transmission.

3. The waveguide isolator of claim 1, wherein: The guide assembly (7) comprises a second guide part which is located on the side wall of the upper cavity assembly (1).

4. The waveguide isolator of claim 3, wherein: The absorption body (14) has a right-angled trapezoidal longitudinal section, the tip of the absorption body (14) is directed to the guide assembly (7), and the side edge of the absorption body (14) abuts against the inner part of the upper cavity assembly (1); The absorption assembly comprises an absorption sheet (10) which is obliquely installed in the upper cavity assembly (1).

5. The waveguide isolator of claim 3, wherein: The absorption assembly further comprises a plurality of ferrite (15), the plurality of ferrite (15) are separated by a dielectric sheet (16), the ferrite (15) is located in the lower cavity assembly (2), and the ferrite (15) is located directly below the first mounting hole (11).

6. The waveguide isolator of claim 5, wherein: The lower cavity assembly (2) is provided with a second mounting hole (17) at the bottom, a second permanent magnet (18) is installed in the second mounting hole (17) through a second baffle (19), and the second permanent magnet (18) is located directly below the second mounting hole (17).

7. The waveguide isolator of claim 2, wherein: The partition plate (8) is provided with a first boss (20) at the bottom, and the lower cavity assembly (2) is provided with a second boss (21) corresponding to the first boss (20).

8. The waveguide isolator of claim 2, wherein: The first branch cavity (3) and the second branch cavity (4) are each provided with a connecting flange (22) at the end, the connecting flange (22) is provided with a closed sealing groove (23) at the side, and a sealing ring is installed in the sealing groove (23).

9. The waveguide isolator of claim 2, wherein: The upper end surface of the upper cavity assembly (1) is further provided with a heat dissipation fin (24).

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