Water-cooled microwave load

Abstract

The utility model relates to a water-cooled microwave load, which comprises an outer tube, an inner tube, an absorption unit for absorbing microwave energy and a radio frequency connector, the tail end of the outer tube is provided with an end cover for closing the tail end, the inner tube is arranged in the outer tube, the tail end of the inner tube is closed, a flange plate for closing the front end of the outer tube is formed on the circumferential surface of the front end of the inner tube, and the radio frequency connector is arranged in the outer tube. The flange plate is fixed with the head end of the outer pipe, a water-cooling flow channel is formed between the outer pipe and the inner pipe, an inlet and an outlet of the water-cooling flow channel are arranged on the outer pipe in a manner of being far away from each other, the absorption unit is arranged in the inner pipe, and the radio frequency connector is fixed at the front end of the inner pipe and is in contact with the absorption unit. According to the utility model, the water-cooling flow channel is formed between the outer pipe and the inner pipe, and heat generated by the absorption unit is taken away through the external cooling liquid, so that the heat dissipation efficiency is improved, the resistance temperature drift effect is avoided, and the load stability is improved on the basis of not changing the material and the product volume.

Description

Technical Field

[0001] This utility model belongs to the field of microwave load technology, and in particular relates to a water-cooled microwave load. Background Technology

[0002] As a key terminal device in radio frequency systems, microwave loads play a crucial role in absorbing residual energy and maintaining system impedance matching in microwave test equipment such as radar transmitters (e.g., X-band shipborne radar, Ku-band weather radar), 5G millimeter-wave communication base stations (28GHz / 39GHz band), and vector network analyzers.

[0003] In traditional load designs, the heat dissipation structure generally adopts a combination of aluminum heat sinks and air cooling. This heat dissipation method results in low heat dissipation efficiency, is prone to resistance temperature drift, and causes poor load stability. Utility Model Content

[0004] Based on this, a water-cooled microwave load is provided to address the aforementioned technical problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A water-cooled microwave load is characterized by comprising an outer tube, an inner tube, an absorption unit for absorbing microwave energy, and an RF connector. The outer tube has an end cap at its tail end, the inner tube is disposed inside the outer tube and its tail end is closed, and a flange is formed on the circumferential surface of its front end for sealing the front end of the outer tube. The flange is fixed to the head end of the outer tube, a water-cooling channel is formed between the outer tube and the inner tube, and the inlet and outlet of the water-cooling channel are disposed on the outer tube at a distance from each other. The absorption unit is disposed inside the inner tube, and the RF connector is fixed to the front end of the inner tube and contacts the absorption unit.

[0007] This invention eliminates the heat dissipation tooth structure in the prior art and forms a water-cooling channel between the outer and inner tubes. The heat generated by the absorption unit is carried away by the external coolant. Based on this, the heat dissipation efficiency can be improved without changing the material or product volume, avoiding the resistance temperature drift effect and improving the load stability. Compared with the existing air-cooled load, the thermal equilibrium temperature is lower, the resistance change is smaller, and the reflection coefficient is more stable. It can be widely used in aviation, aerospace, radar, radio, broadcasting and communication equipment fields. Attached Figure Description

[0008] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0009] Figure 1 A schematic diagram of the structure of a water-cooled microwave load provided in an embodiment of this utility model;

[0010] Figure 2 A schematic diagram of the left-side structure of a water-cooled microwave load provided for an embodiment of this utility model;

[0011] Figure 3 This is a right-side view of a water-cooled microwave load provided as an embodiment of the present invention. Detailed Implementation

[0012] The embodiments of this utility model will be described below with reference to the accompanying drawings. It should be noted that the embodiments described in this specification are not exhaustive and do not represent the only embodiments of this utility model. The following corresponding embodiments are only for clearly illustrating the utility model content of this patent and are not intended to limit its implementation. For those skilled in the art, different variations and modifications can be made based on the described embodiments. Any obvious variations or modifications that fall within the technical concept and utility model content of this utility model are also within the protection scope of this utility model.

[0013] like Figure 1 As shown, this application embodiment provides a water-cooled microwave load, including an outer tube 110, an inner tube 120, an absorption unit 130, and an RF connector 140.

[0014] The tail end (right end) of the outer tube 110 is fixed with an end cap 111 by bolts to seal the tail end of the outer tube 110. See [link / reference]. Figure 3 .

[0015] The inner tube 120 is concentrically disposed within the outer tube 110, with its tail end closed. The circumferential surface of its front end forms a flange 121 for sealing the front end of the outer tube 110. The flange 121 is fixed to the head end of the outer tube 110 by bolts. (See [reference]). Figure 2 .

[0016] In order to improve the sealing performance between the outer tube 110 and the end cover 111 and the flange 121, sealing components 150 are respectively provided between the end cover 111 and the flange 121 and the outer tube 110. Each sealing component 150 consists of two sealing rings 151, one of which is an O-ring.

[0017] Both the outer tube 110 and the inner tube 120 are made of nickel-plated copper, which is waterproof and has good thermal conductivity.

[0018] A water-cooled flow channel 160 is formed between the outer tube 110 and the inner tube 120 for the passage of coolant. The inlet 161 and outlet 162 of the water-cooled flow channel 160 are disposed on the outer tube at a distance from each other. In this embodiment, the inlet 161 is located on the circumferential surface of the head end of the outer tube 110, and the outlet 162 is located on the end cap 111.

[0019] The absorption unit 130 is used to absorb microwave energy. It includes two absorbers 131 and a coaxial connector 132. The outer diameter of the two absorbers 131 is equal to the inner diameter of the inner tube 120. The two absorbers are arranged in sequence inside the inner tube 120. The coaxial connector 132 is located between the two absorbers 131 and is in contact with the two absorbers 131.

[0020] It should be noted that a single absorber 131 is difficult to reach the length of the inner tube 120, so the absorption unit 130 is designed as a structure with two absorbers 131 and a coaxial connector 132 connected in series.

[0021] The coaxial connector 132 includes an outer conductor 132a, an inner conductor 132b, an insulating support medium 132c, a pressure ring 132d, and two elastic contact bodies (not shown in the figure). The outer conductor 132a and the inner conductor 132b are concentrically arranged. The outer diameter of the outer conductor 132a is equal to the inner diameter of the inner tube 120. The inner conductor 132b is supported by the insulating support medium 132c. The insulating support medium 132c is pressed and fixed on the step of the inner wall of the outer conductor 132a by the pressure ring 132d. The two ends of the inner conductor 132b have blind holes 132e. The two elastic contact bodies fill the two blind holes 132e and are in contact with the two absorbers 131.

[0022] Among them, the outer conductor 132a and the pressure ring 132d are made of aluminum, the inner conductor 132b is made of copper plated with gold, and the elastic contact is made of beryllium copper plated with gold.

[0023] The RF connector 140 is an N-type connector, which is threaded and fixed to the front end of the inner tube 120 and contacts the absorption unit 130.

[0024] As can be seen from the above, the water-cooled microwave load provided in this application embodiment eliminates the heat dissipation tooth structure in the prior art and forms a water-cooling flow channel between the outer tube and the inner tube. The heat generated by the absorption unit is carried away by the external coolant. Based on this, the heat dissipation efficiency can be improved without changing the material or product volume, the resistance temperature drift effect can be avoided, and the load stability can be improved. Compared with the existing air-cooled load, the thermal equilibrium temperature is lower, the resistance change is smaller, and the reflection coefficient is more stable. It can be widely used in aviation, aerospace, radar, radio, broadcasting and communication equipment fields.

[0025] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A water-cooled microwave load, characterized in that, The device includes an outer tube, an inner tube, an absorption unit for absorbing microwave energy, and an RF connector. The outer tube has an end cap at its tail end. The inner tube is disposed inside the outer tube and its tail end is closed. A flange is formed on the circumferential surface of the front end to seal the front end of the outer tube. The flange is fixed to the head end of the outer tube. A water-cooling channel is formed between the outer tube and the inner tube. The inlet and outlet of the water-cooling channel are disposed on the outer tube at a distance from each other. The absorption unit is disposed inside the inner tube. The RF connector is fixed to the front end of the inner tube and contacts the absorption unit.

2. The water-cooled microwave load according to claim 1, characterized in that, The end cap is fixed to the tail end of the outer tube by bolts.

3. The water-cooled microwave load according to claim 1, characterized in that, A sealing assembly is provided between the end cap and the tail end of the outer tube.

4. The water-cooled microwave load according to claim 1, characterized in that, The flange is fixed to the head end of the outer tube by bolts.

5. A water-cooled microwave load according to claim 1, characterized in that, A sealing assembly is provided between the flange and the head end of the outer tube.

6. A water-cooled microwave load according to claim 1, characterized in that, Of the inlet and outlet of the water-cooled flow channel, one opening is located on the circumferential surface of the head end of the outer tube, and the other opening is located on the end cap.

7. A water-cooled microwave load according to claim 1, characterized in that, The inner tube is concentric with the outer tube.

8. A water-cooled microwave load according to claim 1, characterized in that, The absorption unit includes two absorbers and a coaxial connector. The outer diameter of the two absorbers is equal to the inner diameter of the inner tube. The two absorbers are arranged sequentially inside the inner tube. The coaxial connector is located between the two absorbers and is in contact with the two absorbers.

9. A water-cooled microwave load according to claim 1, characterized in that, Both the outer and inner tubes are made of copper-plated nickel.

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