CN110417492B - Method for detecting in-band received spurious signals of antenna - Google Patents
Method for detecting in-band received spurious signals of antenna Download PDFInfo
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- CN110417492B CN110417492B CN201910739652.XA CN201910739652A CN110417492B CN 110417492 B CN110417492 B CN 110417492B CN 201910739652 A CN201910739652 A CN 201910739652A CN 110417492 B CN110417492 B CN 110417492B
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- antenna
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- frequency switch
- spectrum analyzer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
Abstract
The invention relates to a method for detecting in-band received stray of an antenna, which specifically comprises the following steps: 1) in the circuit design link of the whole machine production, a micro radio frequency switch is added on an antenna part close to an RF circuit; 2) manufacturing a PCB layout according to a designed circuit diagram, well arranging the direction of the micro radio frequency switch, and 3) debugging the performance of each part; 4) putting the whole machine into a shielding box, connecting one end of an RF test wire to a micro radio frequency switch, and connecting the other end of the RF test wire to a spectrum analyzer through the RF test wire of the shielding box; 5) turning off the wireless SSID in the web; 6) and setting the spectrum analyzer to a frequency band to be measured. The invention is based on the performance of the antenna in the whole machine and the characteristics of the micro radio frequency switch, and the in-band stray signal received by the antenna in the whole machine is measured by the spectrum analyzer.
Description
Technical Field
The invention belongs to the field of antenna production and manufacturing, and particularly relates to a method for detecting in-band received spurious signals of an antenna.
Background
The advantages and disadvantages of the antenna performance have great influence on the performance of products with the antenna (such as an AP (access point), a PON (passive optical network) with Wi-Fi and the like), and are found in a great deal of research practice: the interference stray of other parts in the whole machine to the antenna is measured, and then the interference stray signal is processed in a targeted manner to become a step which must be carried out to ensure the performance of the antenna. Therefore, how to detect the in-band receive spurious signals of the antenna simply and quickly becomes an important research and development direction.
Disclosure of Invention
To solve the above technical problem, the present invention provides a method for detecting in-band receive spurs of an antenna.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for detecting in-band received spurs of an antenna specifically comprises the following steps:
step one, in a circuit design link of the whole machine production, an antenna circuit, a pi-type matching circuit and an RF front-end circuit are electrically connected in sequence on an RF circuit, and a micro radio frequency switch is added on a part close to an antenna;
step two, manufacturing a PCB layout according to the circuit diagram designed in the step one, and putting the direction of the micro radio frequency switch;
step three, debugging the performance of each part;
after the performance test and debugging are finished, putting the whole machine into a shielding box, connecting one end of an RF test wire to the miniature radio frequency switch base, and connecting the other end of the RF test wire to the spectrum analyzer through the RF test wire of the shielding box; at the moment, signal transmission between the micro radio frequency switch and the RF front-end circuit is blocked, and signals transmitted by the antenna can be displayed on the spectrum analyzer through the micro radio frequency switch and the RF test line, so that stray antenna receiving is prevented from leaking to the RF front-end circuit;
step five, turning off the wireless SSID in the web, so that the wireless SSID is not enabled to emit wireless signals to the outside, and stray signals generated by other parts on the board are ensured to be received by the antenna;
and step six, setting the spectrum analyzer to the frequency band to be measured according to the frequency band of the antenna to be measured, and detecting the stray interference signals received by the antenna in the whole machine through the spectrum analyzer.
Further, taking a 2.4G antenna as an example, the parameters of the antenna reception background noise set by the spectrum analyzer are as follows:
stat freq：2350MHZ
stop freq:2550Mhz
RBW：10khz,VBW:30khz
Detect:peak
Trace:Maxhold。
further, in the first step, the micro RF switch is disposed between the pi-type matching circuit and the RF front-end circuit.
Furthermore, in the fourth step, the connection between the RF test line and the micro RF switch is realized by fastening the connection plug of the RF test line to the socket of the micro RF switch.
Compared with the prior art, the invention has the following beneficial effects:
the invention is based on the performance of an antenna in a complete machine and the characteristic of a micro radio frequency switch (RF subsidiary coaxial switch) (when the micro radio frequency switch is buckled with a radio frequency test wire, the micro radio frequency switch has a one-way conduction characteristic, the rear circuit thereof is disconnected, and the signal transmission of the whole link is not influenced when the micro radio frequency switch is not buckled), the antenna, the micro radio frequency switch and a spectrum analyzer are communicated by adding the micro radio frequency switch in an RF circuit of the complete machine to measure in-band stray signals received by the antenna in the complete machine so as to judge the stray interference signals received by the antenna when the complete machine works, thereby achieving the purposes of processing the received in-band stray signals, reducing the interference of the antenna to the minimum and ensuring the optimal performance of the antenna of the complete machine.
Drawings
FIG. 1 is a diagram of RF circuitry in one embodiment of the invention;
FIG. 2 is a diagram illustrating the connection relationship between devices under test according to an embodiment of the present invention;
in the figure, 1, an antenna circuit, 2, a pi-type matching circuit, 3, a micro radio frequency switch, 4, an RF front-end circuit, 5, a shielding box, 6, a spectrum analyzer, 7, a radio frequency test wire, 8 and a complete machine to be tested.
Detailed Description
The present invention will be described in further detail with reference to examples.
A method for detecting in-band received spurs of an antenna specifically comprises the following steps:
step one, in the circuit design link of the whole machine production, as shown in fig. 1, on the RF circuit, the antenna circuit, the pi-type matching circuit and the RF front-end circuit are electrically connected in turn, and a micro radio frequency switch is added near the antenna part; the miniature radio frequency switch is arranged between the pi-shaped matching circuit and the RF front-end circuit;
step two, carrying out PCB layout according to the circuit diagram designed in the step one, and well arranging the direction of the micro radio frequency switch;
step three, debugging the performance of each part;
after the performance test and debugging are finished, as shown in fig. 2, the whole machine to be tested is placed in a shielding box, a connecting plug of an RF test wire is buckled on a base of a micro radio frequency switch, and the other end of the RF test wire is connected to a spectrum analyzer through the RF test wire of the shielding box; at the moment, signal transmission between the micro radio frequency switch and the RF front-end circuit is blocked, and signals transmitted by the antenna can be displayed on the spectrum analyzer through the micro radio frequency switch and the RF test line, so that stray antenna receiving leakage to the RF front-end circuit end is avoided;
step five, turning off the wireless SSID in the web, so that the wireless SSID is not enabled to emit wireless signals to the outside, and stray signals generated by other parts on the board are ensured to be received by the antenna;
step six, setting the spectrum analyzer to a frequency band to be measured according to the frequency band of the antenna to be measured, and detecting the stray interference signals received by the antenna in the whole machine through the spectrum analyzer;
taking a 2.4G antenna as an example, the parameters of the antenna receiving background noise set by the spectrum analyzer are as follows:
stat freq：2350MHZ
stop freq:2550Mhz
RBW：10khz,VBW:30khz
Detect:peak
Trace:Maxhold。
RBW, VBW can reach about-100 db of background noise after the spectrum analyzer is set according to the above, and the interference signal measured is more accurate when the background noise is lower;
because the interference received by the antenna is measured in a shielding environment and comes from the interference generated by the board, the interference is processed according to the measured result, the influence of the interference of other parts on the board on the wireless antenna can be reduced, and the antenna receiving performance of the whole machine is improved.
The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (2)
1. A method for detecting in-band receive spurs of an antenna, comprising the steps of:
step one, in a circuit design link of the whole machine production, an antenna circuit, a pi-type matching circuit and an RF front-end circuit are electrically connected in sequence on an RF circuit, and a micro radio frequency switch is added on a part close to an antenna;
step two, manufacturing a PCB layout according to the circuit diagram designed in the step one, and putting the direction of the micro radio frequency switch;
step three, debugging the performance of each part;
after the performance test and debugging are finished, putting the whole machine into a shielding box, buckling one end of an RF test wire on a miniature radio frequency switch base, and connecting the other end of the RF test wire to a spectrum analyzer through the RF test wire of the shielding box; at the moment, signal transmission between the micro radio frequency switch and the RF front-end circuit is blocked, and signals transmitted by the antenna can be displayed on the spectrum analyzer through the micro radio frequency switch and the RF test line, so that stray antenna receiving leakage to the RF front-end circuit end is avoided;
step five, turning off the wireless SSID in the web, so that the wireless SSID is not enabled to emit wireless signals to the outside, and stray signals generated by other parts on the board are ensured to be received by the antenna;
and step six, setting the spectrum analyzer to the frequency band to be measured according to the frequency band of the antenna to be measured, and detecting the stray interference signals received by the antenna in the whole machine through the spectrum analyzer.
2. The method of claim 1, wherein the step four, the connection of the RF test line to the RF micro switch is performed by fastening a connection plug of the RF test line to a socket of the RF micro switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910739652.XA CN110417492B (en) | 2019-08-12 | 2019-08-12 | Method for detecting in-band received spurious signals of antenna |
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| CN201910739652.XA CN110417492B (en) | 2019-08-12 | 2019-08-12 | Method for detecting in-band received spurious signals of antenna |
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| CN110417492A CN110417492A (en) | 2019-11-05 |
| CN110417492B true CN110417492B (en) | 2021-09-07 |
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| CN110417492A (en) | 2019-11-05 |
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