CN216387222U - 50MHz ~18GHz shielding effectiveness test system - Google Patents
50MHz ~18GHz shielding effectiveness test system Download PDFInfo
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- CN216387222U CN216387222U CN202122572358.XU CN202122572358U CN216387222U CN 216387222 U CN216387222 U CN 216387222U CN 202122572358 U CN202122572358 U CN 202122572358U CN 216387222 U CN216387222 U CN 216387222U
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Abstract
The utility model provides a 50MHz-18GHz shielding effectiveness testing system which comprises a signal source, an antenna transmitting end, an antenna receiving end, a low-noise amplifier module, a radio frequency conversion module and a computer, wherein the antenna receiving end is arranged in a shielding cabinet to be tested, the antenna receiving end is connected with the computer through the low-noise amplifier module and the radio frequency conversion module, the computer is connected with the antenna transmitting end through the signal source, and the signal source, the antenna transmitting end, the antenna receiving end, the low-noise amplifier module, the radio frequency conversion module, the computer and the shielding cabinet to be tested are all positioned in a full-wave or half-wave darkroom. According to the utility model, the antenna receiving end is arranged in the shielding cabinet to be tested, the signal source, the antenna transmitting end, the radio frequency conversion module and the computer are all arranged in the full-wave or semi-wave darkroom, the test result is recorded and analyzed by the computer, and the structural module of the whole test system is simple and easy to maintain and expand.
Description
Technical Field
The utility model relates to the technical field of shielding test, in particular to a 50MHz-18GHz shielding effectiveness test system.
Background
At present, the technology used in the shielding test is to use a single frequency spectrograph and a signal source to carry out the shielding test, and when the frequency is higher, the testing requirement on an instrument is higher, so that the high economic cost is caused, and the volume of the testing instrument is larger and is not beneficial to carrying. In addition, in the prior art, the test transmitting end is often shielded, and the test receiving end may receive an interfering external signal, so that the test accuracy is affected, and a potential error exists.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model aims to provide a 50MHz-18GHz shielding effectiveness test system, an antenna receiving end and a low noise amplifier module are arranged in a shielding cabinet to be tested, the shielding cabinet to be tested, a signal source, an antenna transmitting end, a radio frequency conversion module and a computer are all arranged in a full-wave or semi-wave darkroom, and the computer is used for recording and analyzing a test result, so that the structural module of the whole test system is simple and easy to maintain and expand.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
a50 MHz-18GHz shielding effectiveness test system comprises a signal source, an antenna transmitting end, an antenna receiving end, a low-noise amplifier module, a radio frequency conversion module and a computer, wherein the antenna receiving end is placed in a shielding cabinet to be tested, the antenna receiving end is connected with the computer sequentially through the low-noise amplifier module and the radio frequency conversion module, the computer is connected with the antenna transmitting end through the signal source, and the signal source, the antenna transmitting end, the antenna receiving end, the low-noise amplifier module, the radio frequency conversion module, the computer and the shielding cabinet to be tested are all located in a full-wave or half-wave darkroom.
Furthermore, the signal source is a signal generator, the frequency range is 50MHz-18GHz, and the output power is 8 dBm-18 dBm.
Further, when the test frequency range of the signal source is 50MHz to 200MHz, both the antenna transmitting end and the antenna receiving end are loop antennas.
Further, when the test frequency range of the signal source is 200 MHz-2 GHz, the antenna transmitting end and the antenna receiving end are both broadband dipole antennas.
Further, when the test frequency range of the signal source is 2 GHz-18 GHz, the antenna transmitting end and the antenna receiving end are both broadband antennas.
Further, the low noise amplifier module includes an attenuator and a low noise amplifier which are connected in sequence.
Furthermore, the radio frequency conversion module comprises a frequency spectrograph, a medium power amplifier, a frequency mixer, a frequency multiplier and a power supply module which are sequentially connected through a radio frequency cable.
Furthermore, the signal source and the radio frequency conversion module are connected with the computer through a USB.
Has the advantages that: according to the utility model, the antenna receiving end is arranged in the shielding cabinet to be tested, the low-noise amplifier module, the signal source, the antenna transmitting end, the radio frequency conversion module and the computer are all arranged in the full-wave or semi-wave darkroom, and the test result is recorded and analyzed by the computer, so that the structural module of the whole test system is simple and easy to maintain and expand.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a block diagram of a 50MHz to 18GHz shielding effectiveness testing system according to an embodiment of the utility model;
FIG. 2 is a schematic layout diagram of a 50MHz-18GHz shielding effectiveness testing system according to an embodiment of the utility model at a testing frequency of 50 MHz-200 MHz;
FIG. 3 is a schematic layout diagram of a 50MHz-18GHz shielding effectiveness testing system according to an embodiment of the utility model at a testing frequency of 200 MHz-2 GHz;
FIG. 4 is a schematic layout diagram of a 50MHz-18GHz shielding effectiveness testing system according to an embodiment of the utility model at a testing frequency of 2 GHz-18 GHz;
fig. 5 is a schematic structural diagram of a radio frequency conversion module of the 50MHz-18GHz shielding effectiveness test system according to the embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Referring to FIGS. 1-5: the utility model provides a 50MHz ~18GHz shielding effectiveness test system, includes signal source 1, antenna transmitting terminal 2, antenna receiving terminal 3, low noise amplifier module 4, radio frequency conversion module 5 and computer 6, antenna receiving terminal 3, low noise amplifier module 4 all place in the shielding rack 7 that awaits measuring, antenna receiving terminal 3 loops through low noise amplifier module 4, radio frequency conversion module 5 and links to each other with computer 6, computer 6 passes through signal source 1 and connects antenna transmitting terminal 2, signal source 1, antenna transmitting terminal 2, antenna receiving terminal 3, low noise amplifier module 4, radio frequency conversion module 5, computer 6 and the shielding rack 7 that awaits measuring all are located full electric wave or half electric wave darkroom 8.
In the embodiment, the antenna receiving end is arranged in the shielding cabinet to be tested, and the shielding cabinet to be tested, the signal source, the antenna transmitting end, the low-noise amplifier module, the radio frequency conversion module and the computer are all arranged in a full-wave or semi-wave darkroom, so that the possibility of receiving external interference is reduced, the test result is recorded and analyzed by the computer, and the structural module of the whole test system is simple and easy to maintain and expand; compared with a manual testing mode, the testing precision and efficiency are greatly improved.
In a specific example, the signal source 1 is a signal generator, the frequency range is 50MHz to 18GHz, and the output power is 8dBm to 18 dBm.
In a specific example, when the test frequency range of the signal source 1 is 50MHz to 200MHz, both the antenna transmitting end 2 and the antenna receiving end 3 are loop antennas.
Note that, the loop antenna frequency range of the present embodiment: 50 MHz-300 MHz; working temperature: -10 ℃ to +60 ℃; gain: 20 dB.
In a specific example, when the test frequency range of the signal source 1 is 200MHz to 2GHz, the antenna transmitting end 2 and the antenna receiving end 3 are both broadband dipole antennas.
It should be noted that the frequency range of the broadband dipole antenna of this embodiment is 200MHz to 2 GHz; polarization: linearly polarizing; gain: more than or equal to-5 dB, 0.2 GHz-0.5 GHz; not less than 0dB, 0.5 GHz-1 GHz; not less than 4dB, 1 GHz-2 GHz; standing-wave ratio: less than or equal to 2.5; the connector model is as follows: SMA-50K.
In a specific example, when the test frequency range of the signal source 1 is 2GHz to 18GHz, the antenna transmitting end 2 and the antenna receiving end 3 are both broadband antennas.
It should be noted that the frequency range of the wideband antenna of this embodiment is: 2.0-18 GHz; gain: not less than 6dBi, 2 GHz-4 GHz; not less than 8dBi, 4 GHz-10 GHz; not less than 10dBi, 10 GHz-18 GHz; standing waves: 2.5: 1 (typical); a connector: SMA-50K.
In a specific example, the low noise amplifier module 4 includes an attenuator and a low noise amplifier connected in sequence.
In this embodiment, the attenuator is used to protect the low noise amplifier and the radio frequency conversion module, so as to prevent the device from being damaged by excessive power, the frequency of the low noise amplifier in this embodiment: 50MHz-18 GHz; gain: 28 dB; output power: 15 dBm. The attenuation range of the attenuator of the present embodiment is adjustable: DC-18 GHz; maximum standing-wave ratio: 1.70; insertion loss: less than or equal to 1.5 dB; attenuation range: 0-70 dB.
In a specific example, the radio frequency conversion module 5 includes a frequency spectrograph, a middle power amplifier, a mixer, a frequency multiplier, and a power module, which are connected in sequence through a radio frequency cable.
In a specific example, the signal source 1 and the rf frequency conversion module 5 are connected to the computer 6 through USB.
The working principle and the test process of the test system of the embodiment are as follows:
the signal source and the radio frequency conversion module in the system of the embodiment are connected with a computer through a USB, and the signal source and the radio frequency conversion module can be controlled through the computer; the test of the piece that awaits measuring shielding efficiency of this embodiment is accomplished in full anechoic chamber or half anechoic chamber, and the antenna receiving terminal is placed inside the piece that awaits measuring, is connected with LNA module and radio frequency conversion module, and the attenuator in the LNA module is adjustable, protection low noise amplifier and radio frequency conversion module that can be fine, prevent that the antenna received power is too big, cause the damage to equipment, and transmitting antenna places in the outside relevant position of the piece that awaits measuring, is connected with the signal source.
When the test is carried out at 50 MHz-6 GHz, the receiving antenna is directly connected with the receiver input interfaces of the LNA module and the radio frequency conversion module, and the test of the shielding efficiency can be completed by controlling the signal source and the spectrometer through a computer.
When the test is carried out at 6 GHz-18 GHz, the intermediate frequency output interface of the radio frequency conversion module is connected with the input interface of the receiver, the receiving antenna is connected with the radio frequency input interfaces of the LNA module and the radio frequency conversion module, and the power of the received signal is converted into the measurable range of the frequency spectrograph through the mixer, the frequency multiplier and the intermediate power amplifier, so that the test is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A50 MHz-18GHz shielding effectiveness test system is characterized by comprising a signal source (1), an antenna transmitting end (2), an antenna receiving end (3), a low noise amplifier module (4), a radio frequency conversion module (5) and a computer (6), the antenna receiving end (3) is arranged in a shielding cabinet (7) to be tested, the antenna receiving end (3) is connected with a computer (6) through a low noise amplifier module (4) and a radio frequency conversion module (5) in sequence, the computer (6) is connected with the antenna transmitting end (2) through the signal source (1), the signal source (1), the antenna transmitting end (2), the antenna receiving end (3), the low-noise amplifier module (4), the radio frequency conversion module (5), the computer (6) and the shielding cabinet (7) to be detected are all located in a full-wave or semi-wave darkroom (8).
2. The 50MHz-18GHz shielding effectiveness test system according to claim 1, wherein the signal source (1) is a signal generator, the frequency range is 50MHz-18GHz, and the output power is 8 dBm-18 dBm.
3. The system for testing shielding effectiveness of 50MHz to 18GHz according to claim 1, wherein when the testing frequency range of the signal source (1) is 50MHz to 200MHz, the antenna transmitting end (2) and the antenna receiving end (3) are both loop antennas.
4. The system for testing shielding effectiveness of 50MHz to 18GHz according to claim 1, wherein when the testing frequency range of the signal source (1) is 200MHz to 2GHz, the antenna transmitting end (2) and the antenna receiving end (3) are both broadband dipole antennas.
5. The system for testing shielding effectiveness between 50MHz and 18GHz according to claim 1, wherein when the testing frequency range of the signal source (1) is between 2GHz and 18GHz, the antenna transmitting end (2) and the antenna receiving end (3) are both broadband antennas.
6. The system for testing shielding effectiveness between 50MHz and 18GHz according to claim 1, wherein the low noise amplifier module (4) comprises an attenuator and a low noise amplifier which are connected in sequence.
7. The system for testing shielding effectiveness of 50MHz to 18GHz according to claim 1, wherein the radio frequency conversion module (5) comprises a frequency spectrograph, a middle power amplifier, a mixer, a frequency multiplier and a power supply module which are connected in sequence through a radio frequency cable.
8. The system for testing shielding effectiveness between 50MHz and 18GHz according to claim 1, wherein the signal source (1) and the radio frequency conversion module (5) are connected with the computer (6) through USB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122572358.XU CN216387222U (en) | 2021-10-21 | 2021-10-21 | 50MHz ~18GHz shielding effectiveness test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122572358.XU CN216387222U (en) | 2021-10-21 | 2021-10-21 | 50MHz ~18GHz shielding effectiveness test system |
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| CN216387222U true CN216387222U (en) | 2022-04-26 |
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| CN202122572358.XU Active CN216387222U (en) | 2021-10-21 | 2021-10-21 | 50MHz ~18GHz shielding effectiveness test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116165446A (en) * | 2023-01-03 | 2023-05-26 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
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2021
- 2021-10-21 CN CN202122572358.XU patent/CN216387222U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116165446A (en) * | 2023-01-03 | 2023-05-26 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
| CN116165446B (en) * | 2023-01-03 | 2023-08-11 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
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