CN210274100U - Radio frequency signal sideband test system - Google Patents
Radio frequency signal sideband test system Download PDFInfo
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- CN210274100U CN210274100U CN201921587760.1U CN201921587760U CN210274100U CN 210274100 U CN210274100 U CN 210274100U CN 201921587760 U CN201921587760 U CN 201921587760U CN 210274100 U CN210274100 U CN 210274100U
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Abstract
The utility model discloses a radio frequency signal sideband test system, including locating the microscope carrier that bears the weight of the radio frequency product in the electric wave darkroom, be used for receiving the useful signal's of radio frequency product receiving antenna, connect receiving antenna's radio frequency amplifier, radio frequency amplifier and be connected to the adjustable attenuator, the adjustable attenuator who locate the electric wave darkroom outside through the radio frequency cable and be connected with the spectral analysis appearance. The utility model provides the high degree of distinguishing to useful radio frequency signal and its sideband small noise signal.
Description
Technical Field
The utility model belongs to the technical field of radio frequency signal detects, especially, relate to a radio frequency signal sideband department noise jamming's test system.
Background
Radio frequency products refer to products that transmit information through space, not through cables. Also known as intentional emitters, radio frequency products, wireless communication products, etc., in different authentication regimes. Typically in the frequency range of 9kHz to 400 GHz.
The wireless radio frequency product is widely applied to the fields of intelligent home, security and protection such as radio frequency identification entrance guard monitoring, industrial signal transmission, internet systems and the like. The product that involves has wireless route, wireless socket, the notebook computer is dull and stereotyped, the cell-phone, bluetooth headset, wireless wrist-watch bracelet, smart bulb, wireless STB, baby's watch-dog, the wireless sensor of water and electricity or pressure, bluetooth glasses, unmanned aerial vehicle, the wireless helmet of VR or AR technique and so on.
The standard frequency band for admission in the north american market uses the FCC (federal communications commission) standard. The test contents mainly include radio frequency power, power spectral density, occupied bandwidth, radiation emission and the like. Some frequency bands in the market admission of the north american market are forbidden, when using the rf signals of the bands 2400-2483.5MHz, there are forbidden bands of 2310-. Therefore, the design of rf products requires great care not to let the edges of the rf signal fall into these forbidden bands, but also to control the noise at the sidebands and out-of-band of the useful signal, and to strictly control the amplitude of the transmitted signal within the limits of the typical amplitude.
In the prior art, the interference at the sideband is tested by adopting a radiation method. Generally, because the amplitude of a useful signal is large, the input end of a spectrum analyzer is placed to be saturated, and an amplifier is not used in the test; or after the signal is led out from the anechoic chamber, a small amplifier is added at the end of the spectrum analyzer, and then the signal is led into the spectrum analyzer. Both methods cannot effectively suppress local noise, so that the useful signal and the local noise in the spectrum analyzer are high, and the useful signal cannot be effectively distinguished.
SUMMERY OF THE UTILITY MODEL
The object of the utility model is to solve above-mentioned technical problem, and provide a radio frequency signal sideband test system to the realization improves the degree of distinguishing to useful radio frequency signal and its sideband small noise signal. In order to achieve the above purpose, the utility model discloses technical scheme as follows:
the radio frequency signal sideband test system comprises a carrier platform, a receiving antenna, a radio frequency amplifier and an adjustable attenuator, wherein the carrier platform is arranged in the anechoic chamber and used for bearing radio frequency products, the receiving antenna is used for receiving useful signals of the radio frequency products, the radio frequency amplifier is connected with the receiving antenna, the radio frequency amplifier is connected with the adjustable attenuator arranged outside the anechoic chamber through a radio frequency cable, and the adjustable attenuator is connected with a spectrum analyzer.
Specifically, the carrying platform can be rotatably arranged, and the distance between the radio frequency product and the ground is 150 cm.
Specifically, a signal receiving tower is arranged behind the radio frequency product, and a receiving antenna is arranged on the signal receiving tower and on the horizontal position relative to the carrying platform.
Specifically, a radio frequency amplifier is arranged on the back of the signal receiving tower of the receiving antenna.
Specifically, the distance between the receiving antenna and the carrier is 3 m.
Specifically, the bottom of the signal receiving tower is provided with a movable base, and the base is provided with a driving device for driving the base to move.
Specifically, a controller connected with the driving device is arranged outside the electric wave darkroom, and the controller transmits signals to the driving device.
Compared with the prior art, the utility model discloses radio frequency signal sideband test system's beneficial effect mainly embodies:
the radio frequency amplifier is placed at an antenna port, and a proper radio frequency attenuator with adjustable size is added at a spectrum analyzer port, so that balance is achieved, the useful signal amplitude is not too large to cause saturation of the spectrum analyzer, and local noise can be effectively suppressed;
the bottom noise of the frequency spectrograph can be reduced, the resolution of useful radio frequency signals and sideband micro noise signals thereof is improved, the standard frequency band limit value requirement can be met more perfectly, and the noise signals required to be distinguished can be distinguished.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
the figures in the drawings represent:
the system comprises a anechoic chamber 1, a radio frequency product 2, a carrier 21, a receiving antenna 3, a radio frequency amplifier 31, a radio frequency cable 32, an adjustable attenuator 4, a spectrum analyzer 41, a signal receiving tower 5, a base 51, a driving device 52 and a controller 53.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments, but not all embodiments of the present invention.
Example (b):
referring to fig. 1, the embodiment is a system for testing a sideband of a radio frequency signal, and the system includes a carrier 21 for carrying a radio frequency product 2, a receiving antenna 3 for receiving a useful signal of the radio frequency product 2, a radio frequency amplifier 31 connected to the receiving antenna 3, the radio frequency amplifier 31 connected to an adjustable attenuator 4 arranged outside the anechoic chamber 1 through a radio frequency cable 32, and a spectrum analyzer 41 connected to the adjustable attenuator 4.
The carrier 21 can be rotatably arranged, and the distance between the radio frequency product 2 and the ground is 150 cm. The radio frequency product 2 is in a state of continuously transmitting signals.
A signal receiving tower 5 is arranged behind the radio frequency product 2, a receiving antenna 3 is arranged on the signal receiving tower 5 and is positioned at a horizontal position relative to the carrier 21, and a radio frequency amplifier 31 is arranged on the back surface of the receiving antenna 3, which is positioned on the signal receiving tower 5. The distance between the receiving antenna 3 and the stage 21 is 3 m.
The bottom of the signal receiving tower 5 is provided with a movable base 51, and the base 51 is provided with a driving device 52 for driving the base to move.
The anechoic chamber 1 is externally provided with a controller 53 connected with the driving device 52, the controller 53 transmits a signal to the driving device 52, and the driving device 52 determines the moving distance of the base 51 of the signal receiving tower 5.
Because the amplitude height of the radio frequency signal is too large, the intermediate frequency input by the spectrum analyzer 41 is saturated, the adjustable attenuator 4 capable of adjusting the signal size is arranged at the front end of the spectrum analyzer 41, the useful signal of the radio frequency signal required by the analysis standard and the noise waveform at the sideband of the radio frequency signal are observed by the spectrum analyzer 41, and whether the radio frequency index of the product meets the standard requirement or not is judged according to the limit value comparison and analysis of the standard radio frequency signal.
When the embodiment is applied, the radio frequency amplifier 31 is connected with the radio frequency cable 32, and the signal is transmitted to the spectrum analyzer 41 through the adjustable attenuator 4, so that the noise of the spectrum analyzer 41 can be effectively suppressed, the identification degree of the useful radio frequency signal and the sideband micro-noise signal thereof can be improved, and the useful signal can be effectively distinguished.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (7)
1. Radio frequency signal sideband test system, its characterized in that: the radio frequency amplifier is connected to an adjustable attenuator arranged outside the anechoic chamber through a radio frequency cable, and the adjustable attenuator is connected with a spectrum analyzer.
2. The radio frequency signal sideband test system of claim 1, wherein: the carrying platform can be rotatably arranged, and the distance between the radio frequency product and the ground is 150 cm.
3. The radio frequency signal sideband test system of claim 1, wherein: and a signal receiving tower is arranged behind the radio frequency product, and a receiving antenna is arranged on the signal receiving tower and is positioned on a horizontal position relative to the carrying platform.
4. The radio frequency signal sideband test system of claim 3, wherein: and the receiving antenna is provided with a radio frequency amplifier on the back of the signal receiving tower.
5. The radio frequency signal sideband test system of claim 1, wherein: the distance between the receiving antenna and the carrier is 3 m.
6. The radio frequency signal sideband test system of claim 3, wherein: the bottom of the signal receiving tower is provided with a movable base, and the base is provided with a driving device for driving the base to move.
7. The radio frequency signal sideband test system of claim 6, wherein: and a controller connected with the driving device is arranged outside the electric wave darkroom and transmits signals to the driving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921587760.1U CN210274100U (en) | 2019-09-23 | 2019-09-23 | Radio frequency signal sideband test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921587760.1U CN210274100U (en) | 2019-09-23 | 2019-09-23 | Radio frequency signal sideband test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210274100U true CN210274100U (en) | 2020-04-07 |
Family
ID=70019699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921587760.1U Active CN210274100U (en) | 2019-09-23 | 2019-09-23 | Radio frequency signal sideband test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210274100U (en) |
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2019
- 2019-09-23 CN CN201921587760.1U patent/CN210274100U/en active Active
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