Coaxial connector and intermodulation test method

Abstract

The invention discloses a coaxial connector and an intermodulation test method, and belongs to the field of communication circuits. The coaxial connector comprises a connector body, a shell and a cover body, wherein the connector body is of a hollow structure; the connector body penetrates through the shell, the shell is provided with a peeping hole communicated with the connector body, and the peeping hole is used for inserting a near-field probe; the cover body is detachably connected with the peeping hole, and the cover body, the connector body and the shell jointly define a shielding cavity. According to the invention, the method can achieve the inter-modulation test of the coaxial connector through employing a near-field radiation test method, can quickly and accurately locate an area with the prominent inter-modulation in the coaxial connector, does not need to dismount the coaxial connector for the inter-modulation test, does not need to shut down a communication link of a mobile communication system, does not need to stop the service, reduces the maintenance difficulty, and improves the efficiency. And the influence range during maintenance is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of communication circuits, and in particular, relates to a coaxial connector and an intermodulation test method. Background Art

[0002] Closed microwave devices such as coaxial connectors are the weak link in the communication link of mobile communication systems and are prone to introduce intermodulation interference. In complex communication systems, there are even dozens of coaxial connectors working at the same time, and the demand for intermodulation testing is huge.

[0003] Cavity testing is usually used to perform intermodulation tests on closed microwave devices such as coaxial connectors, coaxial cables, duplexers or cavity filters. When performing cavity testing on closed microwave devices such as coaxial connectors, the communication link of the mobile communication system needs to be shut down and out of service, and even the microwave components in the link need to be disassembled to test whether they are working properly. This makes maintenance difficult and needs to be improved. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a coaxial connector and an intermodulation test method, which can realize intermodulation testing of the coaxial connector using a near-field radiation test method, quickly and accurately locate the area where the intermodulation is more prominent in the coaxial connector, without the need to disassemble the coaxial connector for intermodulation testing, thereby reducing the difficulty of maintenance and the impact range during maintenance.

[0005] In a first aspect, the present application provides a coaxial connector, comprising:

[0006] A connector body, wherein the connector body is a hollow structure;

[0007] A housing, wherein the connector body is inserted through the housing, and the housing is provided with a peep hole communicating with the connector body, wherein the peep hole is used for inserting a near-field probe;

[0008] A cover body is detachably connected to the peep hole, and the cover body, the connector body and the shell together define a shielding cavity.

[0009] According to the coaxial connector of the present application, a shell connected to the connector body is provided, the shell is provided with a peep hole, and the cover body is detachably connected to the peep hole. When the cover body opens the peep hole, the near-field probe can be inserted into the shielding cavity through the opened peep hole, so as to implement intermodulation testing of the coaxial connector by using a near-field radiation testing method, and quickly and accurately locate the area where the intermodulation is more prominent in the coaxial connector, without the need to disassemble the coaxial connector for intermodulation testing, and without the need to shut down the communication link of the mobile communication system and stop the service, thereby reducing the difficulty of maintenance and the impact range during maintenance; after the test is completed, the cover body blocks the peep hole to close the shielding cavity, so that the connector body can be protected from external interference when the near-field probe is not needed.

[0010] According to an embodiment of the present application, a pair of opposite sides of the shell are provided with mounting holes, the connector body is inserted into the mounting holes, and a side of the shell that is not provided with the mounting holes is provided with the peep hole.

[0011] According to one embodiment of the present application, the connector body and the shell are press-connected.

[0012] According to one embodiment of the present application, the aperture D of the peep hole satisfies: 3mm≤D≤12mm.

[0013] According to one embodiment of the present application, the cover body is provided with an auxiliary groove for adapting to a fastener; and / or the cover body is threadedly fastened to the shell.

[0014] In a second aspect, the present application provides an intermodulation test method, which is applied to the coaxial connector described in any one of the above embodiments, and is characterized by comprising:

[0015] Opening the cover of the coaxial connector;

[0016] Placing a near-field probe on one side of the coaxial connector, inputting a first reference power signal through a signal generator, and obtaining a radiation power value of an environment surrounding the coaxial connector through a spectrum analyzer;

[0017] When the radiation power value is less than the first reference power signal, the near-field probe is inserted into the peep hole of the shell, an intermodulation test is performed on the coaxial connector to obtain an intermodulation power value P of the coaxial connector.

[0018] According to the intermodulation test method of the present application, applied to the coaxial connector of any of the above-mentioned embodiments, when the cover body opens the peep hole, the near-field probe can be inserted into the shielding cavity through the opened peep hole, so as to implement intermodulation testing of the coaxial connector using the near-field radiation test method, quickly and accurately locate the area where the intermodulation is more prominent in the coaxial connector, without the need to disassemble the coaxial connector for intermodulation testing, and without the need to shut down the communication link of the mobile communication system and stop the service, thereby reducing the difficulty of maintenance and the impact range during maintenance; after the test is completed, the cover body blocks the peep hole to close the shielding cavity, so that the connector body can be protected from external interference when the near-field probe is not needed.

[0019] According to one embodiment of the present application, before performing intermodulation testing on the coaxial connector, the method includes:

[0020] When the radiation power value is less than the first reference power signal and the difference is greater than a target value, the near-field probe is calibrated and normalized.

[0021] According to one embodiment of the present application, the calibrating and normalizing the near-field probe includes:

[0022] A second reference power signal Pr is input through the signal generator, and a first near-field radiation power Ps measured by the near-field probe is obtained through the spectrum analyzer;

[0023] Subtracting the first near-field radiation power Ps from the second reference power signal Pr to obtain a calibration value ΔP of the near-field probe;

[0024] The intermodulation test on the coaxial connector comprises:

[0025] The second near-field radiation power PIM is obtained by a spectrum analyzer;

[0026] The intermodulation power value P is acquired based on the calibration value ΔP and the second near-field radiation power PIM.

[0027] According to one embodiment of the present application, the calibrating and normalizing the near-field probe further includes:

[0028] Extending the near-field probe into the housing and marking the current position of the near-field probe as the target position;

[0029] The intermodulation test on the coaxial connector comprises:

[0030] The near-field probe is extended into the target position, and a second near-field radiation power PIM is acquired through a spectrum analyzer.

[0031] According to one embodiment of the present application, before opening the cover of the coaxial connector, the method further includes:

[0032] In the case that the coaxial connector is a sample connector, one end of the coaxial connector is connected to an input port of a signal generator, and the other end of the coaxial connector is connected to a low intermodulation load.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 This is one of the structural schematic diagrams of the coaxial connector provided in the embodiment of the present application;

[0036] Figure 2 This is the second structural schematic diagram of the coaxial connector provided in the embodiment of the present application;

[0037] Figure 3 This is the third structural schematic diagram of the coaxial connector provided in the embodiment of the present application;

[0038] Figure 4 This is the fourth structural schematic diagram of the coaxial connector provided in the embodiment of the present application;

[0039] Figure 5 This is the fifth structural schematic diagram of the coaxial connector provided in the embodiment of the present application;

[0040] Figure 6 This is the sixth structural schematic diagram of the coaxial connector provided in the embodiment of the present application;

[0041] Figure 7 It is a flow chart of the intermodulation test method provided in the embodiment of the present application.

[0042] Reference numerals:

[0043] Connector body 1 , shell 2 , peep hole 21 , cover 3 , auxiliary slot 31 , near-field probe 4 . DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] During routine inspection and maintenance of civil mobile communication systems, the entire link often needs to be shut down and out of service, and even the microwave components in the link need to be disassembled to test whether they are working properly, which brings considerable trouble to users and maintenance engineers. At the same time, RF coaxial connectors, as the weak link in the communication link, are prone to introduce intermodulation interference. In complex communication systems, there are even dozens of connectors working at the same time, and the demand for intermodulation testing is huge.

[0046] Traditional intermodulation test solutions can be mainly divided into two categories: cavity test and radiation test. The intermodulation test of coaxial connectors usually adopts cavity test, which requires the coaxial connector to be disassembled during the test, and the whole link often needs to be shut down and stopped from service, which makes the maintenance work complicated and has a great impact; near-field radiation test is extremely convenient for locating and testing intermodulation sources in microstrip lines, but due to the limitation of the near-field radiation test principle, this test method cannot perform intermodulation test on closed components such as coaxial structures and cavity filters.

[0047] Therefore, non-shutdown testing of communication system links and rapid testing of key microwave components in the links are difficult problems that communication equipment vendors and reliability engineers are working to solve.

[0048] Based on the above problems, the present application provides a coaxial connector and an intermodulation test method. Figure 1-Figure 7 A coaxial connector and an intermodulation test method according to an embodiment of the present application are described.

[0049] Coaxial connectors are commonly used in electronic devices to achieve signal transmission and connection. Coaxial connectors may be N-type, SMA-type, DIN-type and other connectors. For the sake of clear description, this application specifically describes the N-type coaxial connector as the object of explanation.

[0050] The intermodulation test method of the present application can be applied to intermodulation tests such as coaxial connectors or cavity filters.

[0051] like Figure 1 As shown, the coaxial connector of the embodiment of the present application includes: a connector body 1, a shell 2 and a cover body 3. The cover body 3, the connector body 1 and the shell 2 together define a shielding cavity. The function of the shielding cavity is to provide electromagnetic shielding and reduce the impact of external electromagnetic interference on the internal signal transmission of the connector.

[0052] The connector body 1 is a hollow structure. The connector body 1 is composed of an outer conductor, an inner conductor and an insulating medium layer located between the outer conductor and the inner conductor. The insulating medium layer is composed of polytetrafluoroethylene and air.

[0053] Exemplarily, the connector body 1 may be a connector for a communication frequency band of 0 to 3 GHz. For the communication frequency band requirement of 0 to 3 GHz, the connector is an N-type connector, and the connector model is 5 / 8-24UNEF-2A.

[0054] The size and type of coaxial connector can be selected according to the maximum operating frequency requirements.

[0055] like Figure 1 and Figure 6 As shown, the connector body 1 is inserted into the shell 2 , and the shell 2 is provided with a peep hole 21 communicating with the connector body 1 , and the peep hole 21 is used for inserting the near-field probe 4 .

[0056] The near-field probe 4 is a device used to find interference sources in cooperation with a spectrum analyzer.

[0057] Exemplarily, the connector body 1 is provided with a through mounting hole for the connector body 1 to pass through, and the connector body 1 and the shell 2 may be connected by welding or pressing; or, the shell 2 and the connector body 1 may be an integrally formed structure.

[0058] The aperture of the peep hole 21 should be larger than the diameter of the tip of the near-field probe 4 and much smaller than the wavelength of the connector's operating frequency, so that the tip of the near-field probe 4 can be extended into the shielding cavity through the peep hole 21, while reducing the leakage of the connector's operating frequency from the shielding cavity through the opened peep hole 21.

[0059] In some embodiments, Figure 3 As shown, the aperture D of the peep hole 21 satisfies: 3mm≤D≤12mm. Exemplarily, the aperture D of the peep hole 21 can be 3mm, 5mm, 6mm, 7mm, 9mm, 10mm or 12mm.

[0060] The side length of the shell 2 is slightly larger than the diameter of the connector body 1 , so that the connector body 1 can pass through the middle of the cavity of the shell 2 .

[0061] For example, Figure 2 As shown, the housing 2 may be a cube, a rectangular block or a sphere.

[0062] When the shell 2 is a cube or a rectangular block, the 12 edges of the shell 2 can be rounded to reduce sharp structures, facilitate production and processing, and increase safety in use.

[0063] Among them, the aperture of the cover body 3 matches the peep hole 21, the cover body 3 and the peep hole 21 are detachably connected, and the cover body 3 and the peep hole 21 can be connected by threaded connection, plug-in connection or snap-on connection.

[0064] The cover 3 is a component for closing the peep hole 21, and it can be detachably connected to the peep hole 21 to implement intermodulation testing of the coaxial connector in the working state in the communication system without shutting down the entire system.

[0065] like Figure 6 As shown, when the cover body 3 and the peep hole 21 are opened, the near-field probe 4 can be extended into the shielding cavity through the peep hole 21 to perform intermodulation test on the coaxial connector using a near-field radiation test method. Rapid test of coaxial connector intermodulation can be achieved without repeatedly disassembling and assembling the coaxial connector, thereby reducing the testing workload.

[0066] like Figure 1 As shown, after the test is completed, the cover body 3 blocks the peep hole 21 to close the shielding cavity, so that the connector body 1 can be protected from external interference when the near-field probe 4 is not needed.

[0067] The peep hole 21 on the coaxial connector of the present application can be blocked by the cover body 3 without destroying the structural integrity and signal integrity of the coaxial connector, which is a friendly structural design.

[0068] Among them, a through hole can be set on the side wall of the connector body 1, and the through hole connects the interior of the connector body 1 and the shell 2. The peep hole 21 is connected to the through hole to achieve the connection between the connector body 1 and the shell 2.

[0069] The connector body 1 and the shell 2 may be made of the same material, or the shell 2 may be made of a shielding material to reduce radiation leakage, for example, the shell 2 may be made of brass or beryllium copper.

[0070] Exemplarily, the connector body 1 may be a hollow cylinder, the shell 2 may be a rectangular cavity structure, the shell 2 may be a hollow six-sided cube with mounting holes on two sides thereof, so that the connector body 1 can be assembled with the shell 2 through the mounting holes.

[0071] In the related technologies, with the continuous advancement of wireless communication technology, the use of technologies such as high-power transmitters, multiplexing antennas and high-spectrum resources is increasing. At the same time, people's demand for high-sensitivity receivers is also growing. This has led to the problem of passive intermodulation interference caused by passive components becoming increasingly significant. The intermodulation test method is the most effective technology to solve the passive intermodulation interference in the communication system.

[0072] Traditional passive intermodulation test methods can be mainly divided into two categories: cavity test and near-field radiation test. Cavity test method is often used for intermodulation test of closed microwave devices such as coaxial connectors, coaxial cables, duplexers or cavity filters, while near-field radiation test method is generally used for intermodulation test of open microwave devices such as antennas and microstrip lines.

[0073] Among them, near-field radiation testing is extremely convenient for locating and testing intermodulation sources in microstrip lines. By scanning the open plane of the microstrip line with a near-field probe, the intermodulation distribution of the entire microstrip line plane can be obtained, thereby accurately locating the area where intermodulation is more prominent. However, due to the limitations of the near-field radiation testing principle, this method cannot perform intermodulation testing on closed components. The use of cavity testing requires the coaxial connector to be disassembled for intermodulation testing. The communication link of the mobile communication system often needs to be shut down and out of service, and even the microwave components in the link need to be disassembled to test whether they are working properly. Maintenance is difficult and needs to be improved.

[0074] According to the coaxial connector provided in the embodiment of the present application, a shell 2 connected to the connector body 1 is provided, the shell 2 is provided with a peep hole 21, and the cover body 3 is detachably connected to the peep hole 21. When the cover body 3 opens the peep hole 21, the near-field probe 4 can be inserted into the shielding cavity through the opened peep hole 21, so as to realize the intermodulation test of the coaxial connector by the near-field radiation test method, and quickly and accurately locate the area where the intermodulation is more prominent in the coaxial connector, without the need to disassemble the coaxial connector for intermodulation test, and without the need to shut down the communication link of the mobile communication system and stop the service, thereby reducing the difficulty of maintenance and the impact range during maintenance; after the test is completed, the cover body 3 blocks the peep hole 21 to close the shielding cavity, so that the connector body 1 can be protected from external interference when the near-field probe 4 is not needed.

[0075] In some embodiments, the connector body 1 and the shell 2 are compressed and connected, and the connector body 1 and the shell 2 can be tightly installed through the compression connection, reducing the gap between the connector body 1 and the shell 2, and effectively reducing the leakage of the connector operating frequency from the shielding cavity through the gap between the connector body 1 and the shell 2.

[0076] In some embodiments, a pair of opposite sides of the shell 2 are provided with mounting holes, the connector body 1 is inserted into the mounting holes, and a peep hole 21 is provided on a side of the shell 2 where no mounting hole is provided.

[0077] A peep hole 21 is punched on any side surface of the shell 2 where no mounting hole is provided. The hole can be punched by laser cutting or punching, and the connector body 1 is assembled with the shell 2 through the mounting hole.

[0078] The shape of the peep hole 21 is designed to be a smooth geometric shape to avoid electromagnetic leakage caused by geometric discontinuity, for example, Figure 3 As shown, the peep hole 21 can be a circular hole or an elliptical hole.

[0079] In some embodiments, the cover body 3 is threadedly fastened to the shell body 2 , and the cover body 3 is provided with an auxiliary handle protruding from the upper surface of the cover body 3 to assist the staff in rotating the cover body 3 .

[0080] The auxiliary handle can be a protruding block structure or a protruding rib.

[0081] In some embodiments, Figure 1 , Figure 4 and Figure 5 As shown, the cover body 3 is provided with an auxiliary groove 31 for matching with the fastener, and the cover body 3 is threadedly fastened to the housing 2 .

[0082] The cover body 3 can be set to a circular button shape, and the aperture of the cover body 3 matches the peep hole 21 to seal the peep hole 21. The upper end surface of the cover body 3 can be provided with a slotted or cross-shaped auxiliary groove 31, and a slotted screwdriver or a cross screwdriver can be inserted into the auxiliary groove 31 to assist the cover body 3 in tightening or opening relative to the peep hole 21. The auxiliary groove 31 can simplify the assembly of the cover body 3 and the peep hole 21.

[0083] Among them, the cover body 3 can be provided with an external thread structure, and the hole wall of the peep hole 21 can be provided with an external thread structure. The cover body 3 and the peep hole 21 are fastened together by threads to increase the reliability of the connection between the cover body 3 and the peep hole 21, facilitate repeated disassembly and installation of the cover body 3 and the peep hole 21, and at the same time improve the sealing of the shielding cavity and reduce the influence of external dust particles or humid air on the coaxial connector.

[0084] In some embodiments, Figure 4 and Figure 5 As shown, the cover body 3 is provided with an auxiliary groove 31 for matching with the fastener.

[0085] The upper end surface of the cover body 3 can be provided with a slotted or cross-shaped auxiliary groove 31, into which a slotted screwdriver or a cross screwdriver can be inserted to assist in tightening the cover body 3 relative to the peep hole 21. The auxiliary groove 31 can be provided to simplify the assembly of the cover body 3 and the peep hole 21.

[0086] According to the coaxial connector provided in the embodiment of the present application, by setting a peep hole 21 on the coaxial connector, the need for rapid intermodulation testing of the coaxial connector in a working state can be solved based on the near-field radiation test principle. The entire system does not need to be shut down or the connector removed again, and has repeatable operability, thereby realizing convenient testing of near-field radiation intermodulation of the closed coaxial connector.

[0087] In some embodiments, the cover 3 is threadedly fastened to the housing 2 .

[0088] The cover body 3 can be provided with an external thread structure, and the hole wall of the peep hole 21 can be provided with an external thread structure. The cover body 3 and the peep hole 21 are fastened together by threads to increase the reliability of the connection between the cover body 3 and the peep hole 21, facilitate repeated disassembly and installation of the cover body 3 and the peep hole 21, and at the same time improve the sealing of the shielding cavity and reduce the influence of external dust particles or humid air on the coaxial connector.

[0089] like Figure 7 As shown, an embodiment of the present application further provides an intermodulation test method, which is applied to the coaxial connector of any of the above embodiments. The intermodulation test method includes: step 100, step 200 and step 300.

[0090] Step 100, opening the cover 3 of the coaxial connector.

[0091] The upper end surface of the cover body 3 may be provided with a slotted or cross-shaped auxiliary groove 31 , into which a slotted screwdriver or a cross screwdriver may be inserted to assist the cover body 3 in unscrewing relative to the peep hole 21 .

[0092] The cover body 3 and the peep hole 21 may be connected via threads, and the cover body 3 and the peep hole 21 may be assembled or decoupled by rotating the cover body 3 counterclockwise or clockwise.

[0093] Step 200: place the near-field probe 4 on one side of the coaxial connector, input a first reference power signal through a signal generator, and obtain the radiation power value of the surrounding environment of the coaxial connector through a spectrum analyzer.

[0094] In this step, a signal generator is used to input a first reference power signal, the cover 3 is opened, the near-field probe 4 is arbitrarily placed near the coaxial connector to be tested, and a spectrum analyzer is used to read the radiation power value of the surrounding environment.

[0095] The first reference power signal is a single-frequency reference power signal, and the first reference power signal can be set according to test requirements.

[0096] Exemplarily, the first reference power signal may be 30 dBm, 46 dBm, or any other value.

[0097] Step 300: When the radiation power value is less than the first reference power signal, the near-field probe 4 is inserted into the peep hole 21 of the housing 2 to perform an intermodulation test on the coaxial connector to obtain an intermodulation power value P of the coaxial connector.

[0098] Among them, the situation that the radiation power value is less than the first reference power signal indicates that the structure of the peep hole 21 does not cause obvious electromagnetic leakage of the coaxial connector, and the signal is confined within the peep hole 21 of the coaxial connector, and the next step can be performed.

[0099] According to the intermodulation test method provided in the embodiment of the present application, applied to the coaxial connector of any of the above-mentioned embodiments, when the cover body 3 opens the peep hole 21, the near-field probe 4 can be inserted into the shielding cavity through the opened peep hole 21, so as to realize the intermodulation test of the coaxial connector by using the near-field radiation test method, and quickly and accurately locate the area where the intermodulation is more prominent in the coaxial connector, without the need to disassemble the coaxial connector for intermodulation test, and without the need to shut down the communication link of the mobile communication system and stop the service, thereby reducing the difficulty of maintenance and the impact range during maintenance; after the test is completed, the cover body 3 blocks the peep hole 21 to close the shielding cavity, so that the connector body 1 can be protected from external interference when the near-field probe 4 is not needed.

[0100] In some embodiments, before step 300 performs intermodulation testing on the coaxial connector, the intermodulation testing method further includes: when the radiation power value is less than the first reference power signal and the difference is greater than the target value, calibrating and normalizing the near-field probe 4 .

[0101] The target value may be set according to an electromagnetic shielding effectiveness standard, for example, the target value may be 100 dB.

[0102] In this step, it is necessary to determine whether the radiation power value is less than the first reference power signal and whether the difference between the two is greater than the target value of 100 dB.

[0103] When the radiation power value is less than the first reference power signal and the difference between the two is greater than 100 dB, it indicates that the structure of the peep hole 21 does not cause obvious electromagnetic leakage, and the electromagnetic signal is confined within the connector peep hole 21, and the near-field probe 4 can be calibrated and normalized.

[0104] When the radiation power value is greater than or equal to the first reference power signal, or the radiation power value is less than the first reference power signal and the difference between the two is less than 100dB, it indicates that the structure of the peephole 21 causes obvious electromagnetic leakage, and there is a problem with the design of the coaxial connector, and a new coaxial connector needs to be replaced.

[0105] It should be noted that, according to the working principle of the near-field probe 4, the radiation signal tested by the near-field probe 4 is not equal to the signal transmitted by the connector. From the signal input end to the test end of the near-field probe 4, there are unknown factors such as attenuation and phase shift of the transmission line, signal radiation loss, and coupling of the near-field probe 4. These unknown factors need to be eliminated by calibrating and normalizing the near-field probe 4.

[0106] In some embodiments, step 300 calibrates and normalizes the near-field probe 4 , and further includes: extending the near-field probe 4 into the housing 2 , and marking the current position of the near-field probe 4 as the target position.

[0107] In this step, the cover 3 is opened, the near-field probe 4 is inserted, and the current position of the near-field probe 4 is fixed and marked. The current position of the near-field probe 4 is the target position.

[0108] In some embodiments, step 300 performs an intermodulation test on the coaxial connector, including: extending the near-field probe 4 to a target position, and obtaining a second near-field radiation power PIM through a spectrum analyzer.

[0109] In some embodiments, step 300 calibrates and normalizes the near-field probe 4, including:

[0110] The second reference power signal Pr is input through the signal generator, and the first near-field radiation power Ps measured by the near-field probe 4 is obtained through the spectrum analyzer; the first near-field radiation power Ps is subtracted from the second reference power signal Pr to obtain the calibration value ΔP of the near-field probe 4.

[0111] In this step, the cover 3 is opened, the near-field probe 4 is inserted, a second reference power signal Pr is input using a signal generator, and then a spectrum analyzer is used to read the near-field radiation power Ps measured by the near-field probe 4. The calibration value of the near-field probe 4 satisfies: ΔP=Pr-Ps.

[0112] After calibration is complete, perform an intermodulation test on the connectors.

[0113] In some embodiments, step 300 performs an intermodulation test on the coaxial connector, including: obtaining a second near-field radiation power PIM through a spectrum analyzer; and obtaining an intermodulation power value P based on a calibration value ΔP and the second near-field radiation power PIM.

[0114] In this step, the cover 3 is opened, the near-field probe 4 is moved to the target position, two single-frequency carrier signals are input using a signal generator, and the near-field radiation power PIM of the test is read using a spectrum analyzer, and the calibration amount ΔP of the near-field probe 4 is added to obtain the real intermodulation power value P. The expression of the real intermodulation power P is:

[0115] P=PIM+ΔP=PIM+Pr-Ps.

[0116] After the test is completed, the near-field probe 4 is taken out and the cover 3 is locked, so that the shell 2 and the cover 3 together form a closed coaxial connector structure, which can reduce the influence of external dust particles or humid air on the coaxial connector.

[0117] The first reference power signal and the second reference power signal may be of the same value or of different values.

[0118] In some embodiments, before step 100 of opening the cover 3 of the coaxial connector, the step further includes:

[0119] When the coaxial connector is the sample connector, one end of the coaxial connector is connected to the input port of the signal generator, and the other end of the coaxial connector is connected to the low intermodulation load.

[0120] In this embodiment, when the coaxial connector is a sample connector, it is necessary to simulate the working state of the coaxial connector, connect one end of the sample coaxial connector to the low intermodulation cable of the signal generator input port, and connect the other end of the sample coaxial connector to the low intermodulation load to form a simple signal transmission link.

[0121] It should be noted that when the coaxial connector has been used as a link in the signal transmission link, that is, the coaxial connector is already in working condition, there is no need to perform the above-mentioned steps of simulating the working condition of the coaxial connector, and the coaxial connector can be directly subjected to intermodulation testing using the intermodulation testing method of any of the above-mentioned embodiments.

[0122] The near-field probe 4 is connected to the input end of the spectrum analyzer to form a near-field radiation test device.

[0123] According to the intermodulation test method of the coaxial connector provided in the embodiment of the present application, by setting a peep hole 21 on the coaxial connector, the demand for rapid intermodulation testing of the coaxial connector in a working state can be solved based on the near-field radiation test principle. The entire system does not need to be shut down or the connector is disassembled again, and the system has repeatable operability, thereby realizing convenient testing of near-field radiation intermodulation of the closed coaxial connector.

[0124] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0125] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0126] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0127] In the description of the present application, “plurality” means two or more.

[0128] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0129] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0130] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0131] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A coaxial connector, characterized in that: include: A connector body, wherein the connector body is a hollow structure; A housing, wherein the connector body is inserted through the housing, and the housing is provided with a peep hole communicating with the connector body, wherein the peep hole is used for inserting a near-field probe; A cover body is detachably connected to the peep hole, and the cover body, the connector body and the shell together define a shielding cavity.

2. The coaxial connector according to claim 1, characterized in that: A pair of opposite side surfaces of the shell are provided with mounting holes, the connector body is inserted into the mounting holes, and a side surface of the shell not provided with the mounting holes is provided with the peep hole.

3. The coaxial connector according to claim 1, characterized in that: The connector body and the housing are press-connected.

4. The coaxial connector according to claim 1, characterized in that: The aperture D of the peep hole satisfies: 3mm≤D≤12mm.

5. The coaxial connector according to claim 1, characterized in that: The cover body is provided with an auxiliary groove for matching with a fastener; and / or the cover body is threadedly fastened to the housing.

6. An intermodulation test method, applied to the coaxial connector according to any one of claims 1 to 5, characterized in that: include: Opening the cover of the coaxial connector; Placing a near-field probe on one side of the coaxial connector, inputting a first reference power signal through a signal generator, and obtaining a radiation power value of an environment surrounding the coaxial connector through a spectrum analyzer; When the radiation power value is less than the first reference power signal, the near-field probe is inserted into the peep hole of the shell, an intermodulation test is performed on the coaxial connector to obtain an intermodulation power value P of the coaxial connector.

7. The intermodulation test method according to claim 6, characterized in that: Before performing intermodulation test on the coaxial connector, the method includes: When the radiation power value is less than the first reference power signal and the difference is greater than a target value, the near-field probe is calibrated and normalized.

8. The intermodulation test method according to claim 7, characterized in that: The calibrating and normalizing the near-field probe comprises: A second reference power signal Pr is input through the signal generator, and a first near-field radiation power Ps measured by the near-field probe is obtained through the spectrum analyzer; Subtracting the first near-field radiation power Ps from the second reference power signal Pr to obtain a calibration value ΔP of the near-field probe; The intermodulation test on the coaxial connector comprises: The second near-field radiation power PIM is obtained by a spectrum analyzer; The intermodulation power value P is acquired based on the calibration value ΔP and the second near-field radiation power PIM.

9. The intermodulation test method according to claim 8, characterized in that: The calibrating and normalizing the near-field probe further includes: Extending the near-field probe into the housing and marking the current position of the near-field probe as the target position; The intermodulation test on the coaxial connector comprises: The near-field probe is extended into the target position, and a second near-field radiation power PIM is acquired through a spectrum analyzer.

10. The intermodulation test method according to claim 6, characterized in that: Before opening the cover of the coaxial connector, the method further comprises: In the case that the coaxial connector is a sample connector, one end of the coaxial connector is connected to an input port of a signal generator, and the other end of the coaxial connector is connected to a low intermodulation load.

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