An impedance-adjustable radio frequency coaxial load

Abstract

The present invention discloses an impedance-adjustable radio frequency coaxial load, comprising a first outer shell, a second outer shell, a third outer shell, a first inner conductor, an elastic member, a second inner conductor, a resistor, a retaining spring and an adjusting screw. The second outer shell and the third outer shell are sequentially arranged in a first through hole, and the first through hole, the second through hole and the third through hole are connected. An accommodating area is formed between the first through hole and the second through hole. The first inner conductor, the elastic member, the second inner conductor and the resistor are sequentially electrically connected and are all located in the accommodating area. The left end of the first inner conductor is connected to the inner wall of the first through hole. The retaining spring is arranged at the right port of the second through hole, and the right end of the resistor is located inside the retaining spring and can slide. The adjusting screw is slidably arranged in the third through hole, and the left end of the adjusting screw passes through the inside of the retaining spring and can contact the right end of the resistor. The purpose of the present invention is to provide an impedance-adjustable radio frequency coaxial load, and the adjustable impedance realizes the adjustment of the voltage standing wave ratio performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connectors, and in particular to a radio frequency coaxial load with adjustable impedance. Background Art

[0002] RF coaxial loads are widely used in radio equipment, electronic instruments and various microwave devices. In the system, impedance matching is performed on the vacant spare signal channels and test ports, which not only ensures the impedance matching of the signal, but also greatly reduces the signal leakage of the vacant ports. At present, traditional RF coaxial loads are usually directly assembled with inner conductors, outer conductors and resistors. After assembly, the impedance of the generated product cannot be adjusted, and the voltage standing wave ratio cannot be adjusted, so the scope of application is relatively small.

[0003] The impedance of the product cannot be changed. Since the voltage standing wave ratio of the product often fluctuates greatly due to the influence of the component size processing deviation and the assembly process, if the voltage standing wave ratio of the product does not meet the requirements, the product can only be scrapped directly or some parts replaced to retest until the voltage standing wave ratio of the product meets the requirements; but directly scrapping the product will greatly reduce the qualified rate of the product, and the process of replacing some parts is very cumbersome, time-consuming and has a large loss of parts. Therefore, for an impedance-adjustable RF coaxial load, the impedance of the product cannot be adjusted, the voltage standing wave ratio cannot be adjusted, and the scope of application is small; affecting the qualified rate of the product and the loss rate of parts is a problem we need to solve. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide an impedance-adjustable RF coaxial load with a simple structure. The adjustable impedance can realize the adjustment of the voltage standing wave ratio, thereby having an excellent voltage standing wave ratio, and also reducing the requirements on the size and processing accuracy of parts to a certain extent; improving the scope of application and the qualified rate, and reducing the loss rate of parts.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: an impedance-adjustable RF coaxial load, comprising a first outer shell having a first through hole, a second outer shell having a second through hole, a third outer shell having a third through hole, a first inner conductor, an elastic member, a second inner conductor, a resistor, a retaining spring and an adjusting screw, the second outer shell and the third outer shell are sequentially arranged in the first through hole and the first through hole, the second through hole and the third through hole are connected, a containing area is formed between the first through hole and the second through hole, the first inner conductor, the elastic member, the second inner conductor and the resistor are electrically connected in sequence and are all located in the containing area, the left end of the first inner conductor is connected to the inner wall of the first through hole, the retaining spring is arranged at the right port of the second through hole and the right end of the resistor is located inside the retaining spring and can slide, the adjusting screw is slidably arranged in the third through hole and the left end of the adjusting screw passes into the retaining spring and can contact the right end of the resistor.

[0006] The beneficial effect of the impedance-adjustable RF coaxial load of the present invention is that the first outer shell, the second outer shell, the third outer shell, the first inner conductor, the elastic member, the second inner conductor, the resistor and the spring are assembled first, and the second outer thread of the adjusting screw is coated with an appropriate amount of conductive glue, and then the adjusting screw is screwed into the third outer shell to complete the assembly and generate the product. The network analyzer and the product are electrically connected, and the voltage standing wave ratio of the product is adjusted by sliding the position of the adjusting screw according to the requirements of the voltage standing wave ratio. When the adjusting screw is slid to the left, since the left end of the first inner conductor is connected to the inner wall of the first through hole and the adjusting screw is in contact with the right end of the resistor, the adjusting screw will push the right end of the resistor to slide left inside the spring, and then drive the resistor, the second inner conductor, and the elastic member to slide left, and the elastic member is in a contracted state at this time; when the resistor is pushed to slide to the left by compressing the elastic member, and then the second inner conductor is driven to slide to the left, the gap between the right end of the second inner conductor and the inner wall of the second through hole will become larger, and the characteristic impedance here will become larger, so that the product impedance becomes larger. When the adjustment screw is slid to the right, the elastic part is in an extended state, and the elastic force of the elastic part drives the second inner conductor and the resistor to slide to the right, and the right end of the resistor slides to the right inside the retaining spring; when the second inner conductor and the resistor slide to the right under the elastic force of the elastic part, the gap between the right end of the second inner conductor and the inner wall of the second through hole will become smaller, and the characteristic impedance here will become smaller, so that the product impedance will become smaller. By adjusting the size of the product impedance, the voltage standing wave ratio can be adjusted. This structure of impedance-adjustable products has a simple structure, and the adjustable impedance can adjust the voltage standing wave ratio, so it has an excellent voltage standing wave ratio, and also reduces the requirements for the size and processing accuracy of parts to a certain extent; it improves the scope of application and the qualified rate, and reduces the loss rate of parts.

[0007] As a further improvement of the present invention, it also includes a cover, which is provided with a first external thread, and the right end of the third outer shell is provided with a first internal thread, and the cover is threadedly connected to the third outer shell. The cover is threadedly connected to the third outer shell through the first external thread and the first internal thread. After the product test is qualified, the cover is screwed into the right end of the third outer shell by rotating the cover through the thread.

[0008] As a further improvement of the present invention, a second external thread is provided on the adjusting screw, a second internal thread is provided in the third through hole, and the adjusting screw is threadedly connected to the third outer shell. Through the second external thread and the second internal thread, when the adjusting screw rotates in the internal thread of the third through hole, the adjusting screw slides in the third through hole.

[0009] As a further improvement of the present invention, the right end of the first inner conductor, the right end of the second inner conductor, and the left end of the retaining spring are all provided with closing grooves, the left end of the elastic member is located in the closing groove at the right end of the first inner conductor and the left end of the elastic member is connected to the inner wall of the closing groove at the right end of the first inner conductor, the right end of the elastic member is connected to the left end of the second inner conductor, the left end of the resistor is inserted into the closing groove at the right end of the second inner conductor, and the right end of the resistor passes through the closing groove at the left end of the retaining spring to the inside of the retaining spring. The setting of the closing grooves at the right end of the first inner conductor and the right end of the second inner conductor enables the first inner conductor, the elastic member, the second inner conductor and the resistor to be stably connected together and conduct electricity. In the absence of external force, the right end of the resistor is located inside the retaining spring and the resistor does not slide.

[0010] As a further improvement of the present invention, it also includes an insulator sleeved on the first inner conductor. The insulator plays an insulating role.

[0011] As a further improvement of the present invention, the second through hole has a first step, a second step and an inclined step connected in sequence, and the inner diameter of the first step is greater than the inner diameter of the second step, and the inner diameter of the second step is greater than the inner diameter of the inclined step. The first through hole, the first step, the second step, the inclined step and the third through hole are connected, and a receiving area is formed between the first through hole, the first step, the second step and the inclined step, and the retaining spring is arranged at the right end of the inclined step. When the right end of the resistor is located at the left end of the inclined step, the left end of the resistor is located in the second step, the left part of the first inner conductor is located in the first through hole, and the right part is located in the first step, and the left part of the second inner conductor is located in the first step, and the right part is located in the second step. When the resistor is pushed by compressing the elastic member, and then the second inner conductor is driven to slide to the left, the second inner conductor will slide from the second step to the first step, and the gap between the second inner conductor and the inner wall of the second through hole will become larger, so that the product impedance becomes larger; similarly, when the gap between the second inner conductor and the inner wall of the second through hole becomes smaller, the product impedance will become smaller.

[0012] As a further improvement of the present invention, the elastic member is a spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional view of this embodiment.

[0014] In the figure:

[0015] 1. First outer shell; 2. Second outer shell; 3. Third outer shell; 4. First inner conductor; 5. Elastic member; 6. Second inner conductor; 7. Resistor; 8. Retaining spring; 9. Adjusting screw; 10. Cover; 11. Insulator. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0017] See attached Figure 1 As shown, the present embodiment is an impedance-adjustable RF coaxial load, comprising a first outer shell 1 having a first through hole, a second outer shell 2 having a second through hole, a third outer shell 3 having a third through hole, a first inner conductor 4, an elastic member 5, a second inner conductor 6, a resistor 7, a retaining spring 8 and an adjusting screw 9. The second outer shell 2 and the third outer shell 3 are sequentially arranged in the first through hole, and the first through hole, the second through hole and the third through hole are connected, and a receiving area is formed between the first through hole and the second through hole. The first inner conductor 4, the elastic member 5, the second inner conductor 6 and the resistor 7 are sequentially electrically connected and are all arranged in the receiving area and can slide in the receiving area. The retaining spring 8 is arranged at the right port of the second through hole and the right end of the resistor 7 is located in the left port of the retaining spring 8. The adjusting screw 9 is slidably arranged in the third through hole and the left end of the adjusting screw 9 passes through the right port of the retaining spring 8 and can contact the right end of the resistor 7.

[0018] This embodiment further includes a cover 10, which is provided with a first external thread, and the right end of the third outer shell 3 is provided with a first internal thread, and the cover 10 is threadedly connected to the third outer shell 3. The cover 10 is threadedly connected to the third outer shell 3 through the first external thread and the first internal thread. After the product test is qualified, the cover 10 is screwed into the right end of the third outer shell by rotating the cover 10 through the thread.

[0019] In this embodiment, the adjusting screw 9 is provided with a second external thread, and the third through hole is provided with a second internal thread, and the adjusting screw 9 is threadedly connected with the third outer shell 3. Through the second external thread and the second internal thread, when the adjusting screw 9 rotates in the internal thread of the third through hole, the adjusting screw 9 slides in the third through hole.

[0020] In this embodiment, the right end of the first inner conductor 4, the right end of the second inner conductor 6, and the left end of the spring clip 8 are all provided with a closing groove, the left end of the elastic member 5 is located in the closing groove at the right end of the first inner conductor 4, and the left end of the elastic member 5 is connected to the inner wall of the closing groove at the right end of the first inner conductor 4, the right end of the elastic member 5 is connected to the left end of the second inner conductor 6, the left end of the resistor 7 is inserted into the closing groove at the right end of the second inner conductor 6, and the right end of the resistor 7 passes through the closing groove at the left end of the spring clip 8 to the inside of the spring clip 8. The setting of the closing groove at the right end of the first inner conductor 4 and the right end of the second inner conductor 6 enables the first inner conductor 4, the elastic member 5, the second inner conductor 6 and the resistor 7 to be stably connected together and conduct electricity. In the absence of external force, the resistor 7 does not slide.

[0021] This embodiment further includes an insulator 11 sleeved on the first inner conductor 4. The insulator 11 plays an insulating role.

[0022] In the second through hole of the present embodiment, there are a first step, a second step and an inclined step connected in sequence, and the inner diameter of the first step is greater than the inner diameter of the second step, and the inner diameter of the second step is greater than the inner diameter of the inclined step. The first through hole, the first step, the second step, the inclined step and the third through hole are connected, and a receiving area is formed between the first through hole, the first step, the second step and the inclined step, and the clamping spring 8 is arranged at the right end of the inclined step. When the right end of the resistor 7 is located at the left end of the inclined step, the left end of the resistor 7 is located in the second step, the left part of the first inner conductor 4 is located in the first through hole, and the right part is located in the first step, and the left part of the second inner conductor 6 is located in the first step, and the right part is located in the second step. When the resistor 7 is pushed by compressing the elastic member 5, and then the second inner conductor 6 is driven to slide to the left, the second inner conductor 6 will slide from the second step to the first step, and the gap between the second inner conductor 6 and the inner wall of the second through hole will become larger, so that the product impedance becomes larger; similarly, when the gap between the second inner conductor 6 and the inner wall of the second through hole becomes smaller, the product impedance will become smaller.

[0023] The elastic member 5 of this embodiment is a spring.

[0024] The working process of this embodiment is as follows: first assemble the first outer shell 1, the second outer shell 2, the third outer shell 3, the first inner conductor 4, the elastic member 5, the second inner conductor 6, the resistor 7 and the retaining spring 8, and apply a proper amount of conductive glue on the second outer thread of the adjusting screw 9, then screw the adjusting screw 9 into the third outer shell 3 to complete the assembly and generate the product. The network analyzer is electrically connected to the product, and the voltage standing wave ratio of the product is adjusted by sliding and adjusting the position of the adjusting screw 9 according to the requirements of the voltage standing wave ratio. When the right end of the resistor 7 is located at the left port of the inclined step, the left end of the resistor 7 is located in the second step, the left part of the first inner conductor 4 is located in the first through hole, and the right part is located in the first step, and the left part of the second inner conductor 6 is located in the first step, and the right part is located in the second step. When sliding the adjusting screw 9 to the left, since the left end of the first inner conductor 4 is connected to the inner wall of the first through hole and the adjusting screw 9 is in contact with the right end of the resistor 7, the adjusting screw 9 will push the right end of the resistor 7 to slide left inside the retaining spring 8, thereby driving the resistor 7, the second inner conductor 6, and the elastic member 5 to slide left. At this time, the elastic member 5 is in a contracted state; when the resistor 7 is pushed to the left by compressing the elastic member 5, thereby driving the second inner conductor 6 to slide left, the second inner conductor 6 will slide from the second step to the first step, and the gap between the right end of the second inner conductor 6 and the inner wall of the second through hole will become larger, and the characteristic impedance here will become larger, thereby realizing an increase in product impedance. When the adjustment screw 9 is slid to the right, the elastic member 5 is in an extended state, and the elastic force of the elastic member 5 drives the second inner conductor 6 and the resistor 7 to slide to the right, and the right end of the resistor 7 slides to the right inside the retaining spring 8; when the second inner conductor 6 and the resistor 7 slide to the right under the elastic force of the elastic member 5, the second inner conductor 6 slides from the first step to the second step, and the gap between the right end of the second inner conductor 6 and the inner wall of the second through hole becomes smaller, and the characteristic impedance becomes smaller here. By adjusting the size of the product impedance, the voltage standing wave ratio is adjusted. The impedance-adjustable RF coaxial load of this structure has a simple structure, and the adjustable impedance realizes the adjustment of the voltage standing wave ratio, so it has an excellent voltage standing wave ratio, and also reduces the requirements for the size and processing accuracy of parts to a certain extent; improves the scope of application and the qualified rate, and reduces the loss rate of parts.

[0025] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A radio frequency coaxial load with adjustable impedance, characterized in that: The invention comprises a first outer shell (1) having a first through hole, a second outer shell (2) having a second through hole, a third outer shell (3) having a third through hole, a first inner conductor (4), an elastic member (5), a second inner conductor (6), a resistor (7), a retaining spring (8) and an adjusting screw (9), wherein the second outer shell (2) and the third outer shell (3) are sequentially arranged in the first through hole, and the first through hole, the second through hole and the third through hole are connected, a receiving area is formed between the first through hole and the second through hole, the first inner conductor (4), the elastic member (5), the second inner conductor (6) and the resistor (7) are sequentially electrically connected and are all located in the receiving area, the left end of the first inner conductor (4) is connected to the inner wall of the first through hole, the retaining spring (8) is arranged at the right end of the second through hole, and the right end of the resistor (7) is located inside the retaining spring (8) and can slide, and the adjusting screw (9) is slidably arranged The left end of the adjusting screw (9) is inserted into the third through hole and is able to contact the right end of the resistor (7). The adjusting screw (9) is provided with a second external thread. The third through hole is provided with a second internal thread. The adjusting screw (9) is threadedly connected to the third outer shell (3). The right end of the first inner conductor (4), the right end of the second inner conductor (6) and the left end of the retaining spring (8) are all provided with a closing groove. The left end of the elastic member (5) is located in the closing groove at the right end of the first inner conductor (4) and the left end of the elastic member (5) is connected to the inner wall of the closing groove at the right end of the first inner conductor (4). The right end of the elastic member (5) is connected to the left end of the second inner conductor (6). The left end of the resistor (7) is inserted into the closing groove at the right end of the second inner conductor (6). The right end of the resistor (7) passes through the closing groove at the left end of the retaining spring (8) to the inside of the retaining spring.

2. The impedance-adjustable RF coaxial load according to claim 1, characterized in that: It also comprises a sealing cover (10), the sealing cover (10) being provided with a first external thread, the right end of the third outer shell (3) being provided with a first internal thread, the sealing cover (10) being threadedly connected to the third outer shell (3).

3. The impedance-adjustable RF coaxial load according to claim 1, characterized in that: It also includes an insulator (11) sleeved on the first inner conductor (4).

4. The impedance-adjustable RF coaxial load according to claim 1, characterized in that: The second through hole has a first step, a second step and an inclined step which are connected in sequence, and the inner diameter of the first step is larger than the inner diameter of the second step, and the inner diameter of the second step is larger than the inner diameter of the inclined step. The first through hole, the first step, the second step, the inclined step and the third through hole are connected, and a receiving area is formed between the first through hole, the first step, the second step and the inclined step. The clamping spring (8) is arranged at the right end of the inclined step.

5. The impedance-adjustable RF coaxial load according to claim 1, characterized in that: The elastic member (5) is a spring.

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