CN216434226U - Device for accurately positioning electromagnetic leakage of radio frequency cable assembly - Google Patents
Device for accurately positioning electromagnetic leakage of radio frequency cable assembly Download PDFInfo
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- CN216434226U CN216434226U CN202122901192.1U CN202122901192U CN216434226U CN 216434226 U CN216434226 U CN 216434226U CN 202122901192 U CN202122901192 U CN 202122901192U CN 216434226 U CN216434226 U CN 216434226U
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Abstract
A device for accurately positioning electromagnetic leakage of a radio frequency cable assembly comprises a vector network analyzer, a matched load and a monopole antenna simulation device; one end of a radio frequency cable component to be tested is connected to one port of the vector network analyzer, and the other end of the radio frequency cable component to be tested is connected with a matched load; the monopole antenna simulation device adopts a single-head radio frequency cable, the probe end of the monopole antenna simulation device is horizontally arranged with a radio frequency cable component to be tested, and the end head of the monopole antenna simulation device is connected with the other port of the vector network analyzer. Inputting a radio frequency signal through a vector network analyzer, and if the radio frequency cable component to be tested is damaged, the damaged part is equivalent to a slot antenna, so that electromagnetic waves of the radio frequency cable component can be radiated; if the probe end of the monopole antenna simulation device receives electromagnetic wave signals in the space, the electromagnetic wave leakage of the radio frequency cable assembly is shown. The utility model discloses can realize leaking the accurate positioning, and with low costs, easy operation.
Description
Technical Field
The utility model belongs to the technical field of the radio frequency cable subassembly, concretely relates to device that accurate positioning radio frequency cable subassembly electromagnetism leaked.
Background
The radio frequency flexible cable generally comprises a cable core, an insulating layer and a shielding layer, wherein the shielding layer is woven by silver-plated copper strip wrapping and silver-plated copper wires. In the installation and use process, along with operations such as drag chain, drag, bundling and bending, the cable shielding layer is possibly damaged, once the cable shielding layer is damaged, electromagnetic leakage occurs, electromagnetic interference is generated on other radio frequency parts and components in the same system, and therefore the electromagnetic leakage condition needs to be detected. Currently, there are 2 common methods for testing electromagnetic leakage: the three-axis method and the reverberation chamber method. However, the two methods can only test the electromagnetic leakage condition of the whole rf cable assembly, and cannot accurately locate to which specific position of the whole rf cable assembly the electromagnetic leakage occurs.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the problem among the above-mentioned prior art, provide a device that accurate positioning radio frequency cable subassembly electromagnetism leaked, not only can test radio frequency cable subassembly's electromagnetism and reveal, which position that can also accurate positioning radio frequency cable subassembly has produced and has revealed, implementation cost is low and easy operation.
In order to achieve the above object, the utility model discloses following beneficial effect:
a device for accurately positioning electromagnetic leakage of a radio frequency cable assembly comprises a vector network analyzer, a matched load and a monopole antenna simulation device; one end of a radio frequency cable component to be tested is connected to one port of the vector network analyzer, and the other end of the radio frequency cable component to be tested is connected with a matched load; the monopole antenna simulation device adopts a single-head radio frequency cable, the probe end of the monopole antenna simulation device is horizontally arranged with a radio frequency cable component to be tested, and the end head of the monopole antenna simulation device is connected with the other port of the vector network analyzer.
As the utility model discloses an optimal solution of the device that the accurate positioning radio frequency cable subassembly electromagnetism leaked, vector network analyzer can cover the test frequency channel of the radio frequency cable subassembly that awaits measuring.
As the utility model discloses an optimal solution of the device of accurate positioning radio frequency cable subassembly electromagnetism leakage, matching load and monopole antenna analogue means all work the test frequency channel that vector network analyzer covered.
As the utility model discloses an optimal scheme of the device of accurate positioning radio frequency cable subassembly electromagnetism leakage, monopole antenna analogue means's probe end cut the sheath, shielding layer, the insulating layer of single-end radio frequency cable and tie and obtain.
As the utility model discloses an optimal scheme of the device of accurate positioning radio frequency cable subassembly electromagnetism leakage, monopole antenna analogue means's probe end make the cable conductor surpass the terminal surface of surely flattening.
As the utility model discloses an optimal scheme of the device that the accurate positioning radio frequency cable subassembly electromagnetism leaked, the length that exceeds of the terminal surface that the cable conductor exceeds the surely plane is equal to the quarter that the highest test frequency corresponds the wavelength.
As the utility model discloses an optimal solution of the device of accurate positioning radio frequency cable subassembly electromagnetism leakage, monopole antenna analogue means's probe end is adjacent with the radio frequency cable subassembly that awaits measuring and is placed.
As the utility model discloses an optimal solution of the device of accurate positioning radio frequency cable subassembly electromagnetism leakage, two port positions of vector network analysis appearance are relative, monopole antenna analogue means's probe end is close to a port that vector network analysis appearance inserted radio frequency cable subassembly.
Based on the utility model discloses a method of accurate positioning radio frequency cable subassembly electromagnetism leakage, including following step:
inputting a radio frequency signal to one end of a radio frequency cable component to be tested through a vector network analyzer, wherein if the radio frequency cable component to be tested is damaged, the damaged part is equivalent to a slot antenna, and electromagnetic waves of the radio frequency cable component can be radiated;
electromagnetic waves in space are received through a probe end of the monopole antenna simulation device, if signals are received, electromagnetic wave leakage occurs in the radio frequency cable assembly, and the electromagnetic wave leakage is conducted to the vector network analyzer through the monopole antenna simulation device and is measured.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
compare with the mode that current three coaxial methods and reverberation room method test radio frequency cable subassembly electromagnetism were revealed, the utility model discloses the equipment that uses is simple, be ordinary test equipment including vector network analyzer, matching load and monopole antenna analogue means, monopole antenna analogue means adopt a single-end radio frequency cable can realize, consequently the test cost is low. The test is carried out by the monopole antenna simulation device, the test frequency is high, and the 110GHz radio frequency cable assembly can be tested at present. The utility model discloses can test the electromagnetism of every position of whole root radio frequency cable subassembly and reveal, and what tested is the maximum value of every position, realize accurate location. The test can be finished by horizontally placing the probe end of the monopole antenna simulation device and the radio frequency cable assembly to be tested, and the length of the radio frequency cable assembly to be tested is not limited. The utility model discloses also can test other radio frequency microwave devices, like connector, adapter, waveguide, the coaxial converter of waveguide and waveguide cable subassembly etc. application scope is wider.
Drawings
FIG. 1 is a schematic diagram of an apparatus for testing electromagnetic leakage of a cable by a conventional reverberation chamber method;
FIG. 2 is a schematic diagram of a conventional apparatus for testing electromagnetic leakage of a cable by a three-coaxial method;
FIG. 3 is a schematic view of the structure of the device of the present invention;
in the drawings: 1-a vector network analyzer; 2-a radio frequency cable assembly; 3-matching the load; 4-monopole antenna simulation means; 5-a vector network analyzer first port; 6-vector network analyzer second port;
11-a synthesized signal generator; 12-a first spectrum analyzer; 13-a second spectrum analyzer; 14-a reverberation chamber; 15-mode stirrer; 16-an input antenna; 17-a reference antenna; 18-a stepper motor;
21-a signal generator; 22-a matching circuit; 23-a termination resistor; 24-three coaxial good conductor tubes; 25-resistor.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
Referring to fig. 1, the conventional apparatus for testing electromagnetic leakage of a cable by using a reverberation chamber method uses a large number of devices, including a synthesized signal generator 11, a first spectrum analyzer 12, a second spectrum analyzer 13, a reverberation chamber 14, a mode stirrer 15, an input antenna 16, a reference antenna 17, a stepping motor 18, a connector component, and the like, and the testing principle is as follows:
the electromagnetic wave power PINJ emitted by the synthetic signal generator 11 is emitted into the reverberation chamber 14 through the input antenna 16 in the reverberation chamber 14, the electromagnetic wave excites multimode electromagnetic waves in the reverberation chamber 14, the boundary conditions of the electromagnetic fields change along with the rotation and stirring of the mode stirrer 15, electromagnetic field distribution which is nearly uniform, isotropic and randomly polarized in a statistical mean sense is formed in the reverberation chamber 14, the approximately uniformly distributed electromagnetic power PREF in the reverberation chamber 14 can be received through the reference antenna 17 in the reverberation chamber 14 and is equivalent to the external input power of the measured piece, the electromagnetic power PDUT radiated to the inside of the measured piece can be obtained through a receiver outside the reverberation chamber 14, and then the electromagnetic leakage of the measured piece can be calculated by using the following formula:
in the formula: a iss-shielding attenuation of the DUT, dB;
PREF-power coupled to a reference antenna, W;
PDUT-power, W, coupled to the DUT;
PINJ-power, W, input to the reverberation chamber;
Δinsinsertion of reverberation chambersLoss, dB.
The traditional device for testing the electromagnetic leakage of the cable by the reverberation room method has the following defects:
the required instruments are more, and the test cost is particularly high; the testing frequency is low, and the maximum testing frequency used in the market at present is 18 GHz; the average value of the tested electromagnetic leakage has little significance to the practical use guidance; the electromagnetic leakage of the whole cable is tested, the leakage at a certain position of the cable cannot be accurately positioned, and the practical use guidance significance is not great.
Referring to fig. 2, the conventional apparatus for testing electromagnetic leakage of a cable by a triple-coaxial method uses a device including a signal generator 21, a matching circuit 22, a termination resistor 23, a resistor 25, a vector network analyzer 1 or a signal generator and a receiver, and a nonmagnetic triple-coaxial good conductor tube 24. The principle of the test is as follows: the tested piece is placed in a coaxial good conductor tube 24 without ferromagnetism to form a triaxial device, namely an inner conductor, an outer conductor and a coaxial good conductor tube of the tested piece. The device can be divided into two types according to the reciprocity principle: a signal is injected from the interior of a tested piece, and a coupling signal is taken out from the far end of a coaxial good conductor tube; and the other is injecting signals from a coaxial good conductor tube, and extracting coupling signals from the far end of the tested piece. Power P fed to the interior of the piece under test1The maximum periodic radiant power P received by the external coaxial sleeve systemr，maxThe ratio of the logarithms of (a) is the mask attenuation as：
In the formula:
P1-power delivered to the interior of the piece under test, W;
Pr，max-the periodic maximum power, W, radiated outward by the piece under test;
asshield attenuation, dB.
The device that traditional three coaxial methods tested cable electromagnetism and revealed exists shortcoming in:
the size of the inner diameter of a good three-coaxial conductor tube which is limited by a three-coaxial method and has no ferromagnetism is larger (once the size of the inner diameter is small, a product cannot be put in the good three-coaxial conductor tube), the testing frequency is low, and the highest testing frequency is generally 6 GHz; the length of the three coaxial good conductor tubes without ferromagnetism is limited, the tested product cannot be long or short, otherwise, the product cannot be tested without being installed or overflowing; the tested shielding efficiency of the whole cable is also the shielding efficiency of the whole cable, leakage at a certain position of the cable cannot be accurately positioned, and the practical use guiding significance is not great.
Referring to fig. 3, the device of the present invention includes a vector network analyzer 1, a matching load 3, and a monopole antenna simulation device 4; one end of a radio frequency cable component 2 to be tested is connected to one port of the vector network analyzer 1, and the other end of the radio frequency cable component 2 is connected with a matched load 3; the monopole antenna simulation device 4 adopts a single-head radio frequency cable, the probe end of the monopole antenna simulation device 4 is horizontally arranged with the radio frequency cable component 2 to be tested, and the end head of the monopole antenna simulation device 4 is connected with the other port of the vector network analyzer 1.
In the embodiment, the vector network analyzer 1 selects an adaptive vector network analyzer according to the frequency to be tested, as long as the selected vector network analyzer covers the tested frequency band; one end of a radio frequency cable component 2 to be tested is connected to one port of the vector network analyzer, and the other end of the radio frequency cable component 2 is connected with a matched load; the matching load 3 is matched with the joint of the radio frequency cable component 2 to be tested, and a frequency instrument is used for covering the tested frequency band; the monopole antenna simulation device 4 is a self-made testing device, a single-head radio frequency cable is manufactured, a frequency instrument is used for covering a tested frequency band, one end of the monopole antenna simulation device is connected to the other end of the vector network analyzer, the other end of the monopole antenna simulation device cuts a sheath, a shielding layer and an insulating layer of the cable flat, a cable core wire is higher than the flat end face, the length of the cable core wire is equal to one fourth of the corresponding wavelength of the highest tested frequency, the probe end of the monopole antenna simulation device 4 is horizontally arranged with the radio frequency cable assembly 2 to be tested and is close to the radio frequency cable assembly 2 to be tested, the direction of arrangement is shown in figure 3 and cannot be reversed, namely two ports of the vector network analyzer 1 are opposite, and the probe end of the monopole antenna simulation device 4 is close to one port of the vector network analyzer 1 connected to the radio frequency cable assembly 2.
One end of a radio frequency cable component 2 to be tested is connected with the vector network analyzer 1 to input a radio frequency signal, the damaged part of the radio frequency cable component 2 is equivalent to a slot antenna to radiate electromagnetic waves in a radio frequency coaxial cable, and a quarter-wavelength inner conductor extending out of the monopole antenna simulation device 4 is equivalent to a monopole antenna and can receive electromagnetic waves in space. The electromagnetic wave near the slot antenna is stronger, so the monopole antenna is used for detecting near the coaxial line, if a signal is received, the electromagnetic wave leakage exists in the radio frequency coaxial cable, and the electromagnetic wave leakage can be directly transmitted to the vector network analyzer 1 through the monopole antenna simulation device 4 for direct measurement.
Based on the utility model discloses method that accurate positioning radio frequency cable subassembly electromagnetism leaked, including following step:
inputting a radio frequency signal to one end of a radio frequency cable component 2 to be tested through a vector network analyzer 1, wherein if the radio frequency cable component 2 to be tested is damaged, the damaged part is equivalent to a slot antenna, and electromagnetic waves of the radio frequency cable component 2 can be radiated;
electromagnetic waves in space are received through the probe end of the monopole antenna simulation device 4, if signals are received, the electromagnetic wave leakage occurs in the radio frequency cable assembly 2, and the electromagnetic wave leakage is conducted to the vector network analyzer 1 through the monopole antenna simulation device 4 to be measured.
The utility model discloses not only can test the electromagnetism of radio frequency cable subassembly and reveal, which position that can also the accurate positioning radio frequency cable subassembly has produced reveals, provides powerful support to analysis problem and solution problem, just the device of the utility model is simple in structure, and the test cost is low, and frequency of software testing is high, at present can test 110 GHz. The utility model discloses can test the electromagnetism of whole root radio frequency cable subassembly every position and reveal, and what tested is the maximum value of every position, realize accurate location. The length of the measured piece is not limited. The utility model discloses other radio frequency microwave device also can be tested, like connector, adapter, waveguide, the coaxial converter of waveguide, waveguide cable subassembly etc.
The above-mentioned embodiments are only preferred embodiments of the present invention, and it should be understood by those skilled in the art that the technical solution of the present invention can be modified and replaced easily without departing from the spirit and principle of the present invention, and the modifications and replacements also fall within the protection scope of the appended claims.
Claims (8)
1. An apparatus for accurately locating electromagnetic leakage of a radio frequency cable assembly, comprising: the monopole antenna simulation device comprises a vector network analyzer (1), a matched load (3) and a monopole antenna simulation device (4); one end of a radio frequency cable component (2) to be tested is connected to one port of the vector network analyzer (1), and the other end of the radio frequency cable component is connected with a matched load (3); the monopole antenna simulation device (4) adopts a single-head radio frequency cable, the probe end of the monopole antenna simulation device (4) is horizontally arranged with the radio frequency cable component (2) to be tested, and the end of the monopole antenna simulation device (4) is connected to the other port of the vector network analyzer (1).
2. The apparatus for accurately locating electromagnetic leakage in a radio frequency cable assembly as set forth in claim 1, wherein: the vector network analyzer (1) can cover the test frequency band of the radio frequency cable assembly (2) to be tested.
3. The apparatus for accurately locating electromagnetic leakage in a radio frequency cable assembly as set forth in claim 2, wherein: the matched load (3) and the monopole antenna simulation device (4) work in a test frequency range covered by the vector network analyzer (1).
4. The apparatus for accurately locating electromagnetic leakage in a radio frequency cable assembly as set forth in claim 1, wherein: and the probe end of the monopole antenna simulation device (4) is obtained by cutting the sheath, the shielding layer and the insulating layer of the single-head radio frequency cable flat.
5. The apparatus for accurately locating electromagnetic leakage in an rf cable assembly as set forth in claim 4, wherein: the probe end of the monopole antenna simulation device (4) enables the cable core wire to be higher than the cut flat end face.
6. The apparatus for accurately locating electromagnetic leakage in an rf cable assembly as set forth in claim 5, wherein: the length of the cable core wire higher than the cut-flat end surface is equal to one fourth of the wavelength corresponding to the highest test frequency.
7. The apparatus for accurately locating electromagnetic leakage in a radio frequency cable assembly as set forth in claim 6, wherein: the probe end of the monopole antenna simulation device (4) is closely arranged with the radio frequency cable assembly (2) to be tested.
8. The apparatus for accurately locating electromagnetic leakage in a radio frequency cable assembly as set forth in claim 1, wherein: two ports of the vector network analyzer (1) are opposite in position, and the probe end of the monopole antenna simulation device (4) is close to one port of the vector network analyzer (1) connected to the radio frequency cable assembly (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122901192.1U CN216434226U (en) | 2021-11-24 | 2021-11-24 | Device for accurately positioning electromagnetic leakage of radio frequency cable assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122901192.1U CN216434226U (en) | 2021-11-24 | 2021-11-24 | Device for accurately positioning electromagnetic leakage of radio frequency cable assembly |
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| Publication Number | Publication Date |
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| CN216434226U true CN216434226U (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122901192.1U Active CN216434226U (en) | 2021-11-24 | 2021-11-24 | Device for accurately positioning electromagnetic leakage of radio frequency cable assembly |
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