CN110784273B - Test system and test method - Google Patents
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Abstract
A test system and a test method are provided, wherein the test method is used for measuring the wireless transmission performance of an antenna to be tested in a device to be tested, and comprises the following steps: driving an antenna to be tested to send a wireless signal to the test antenna according to the transmission frequency band; measuring path losses of a plurality of channels of a transmission frequency band to calculate at least one path loss difference value between the plurality of different channels; measuring the frequency response of each of the plurality of channels to calculate the gain drop of each of the plurality of frequency responses of the plurality of channels; and when at least one path loss difference value is larger than a first threshold value or any one of gain drops of a plurality of frequency responses is larger than a second threshold value, driving the positioning device to adjust the relative position between the test antenna and the device to be tested.
Description
Technical Field
The present disclosure relates to testing systems and methods, and particularly to a testing system and a testing method for an electronic device.
Background
In general, a wireless performance testing station is installed in a factory, and a Device Under Test (DUT) is fixed in a Shielding Box (Shielding Box) by using a fixture, and a relative position between a panel antenna and the DUT is adjusted, so that a wireless performance Test of the wireless performance testing station reaches a reference value with good stability.
Therefore, how to automatically adjust the optimal position of the device and the object to be tested, reduce the adjustment time and error rate, and make the verification fixture have higher accuracy is an important issue in the field.
Disclosure of Invention
One embodiment of the present disclosure relates to a test system for measuring wireless transmission performance of an antenna under test in a device under test. The test system comprises a fixing clamp, a test antenna, a positioning device and a control device. The fixing clamp is used for fixing the device to be tested. The test antenna is used for receiving the wireless signal sent by the antenna to be tested according to the transmission frequency band. The control device is coupled to the test antenna and the antenna to be tested. When the test antenna receives a wireless signal, the control device measures path losses of a plurality of channels of a transmission frequency band to calculate at least one path loss difference between a plurality of different channels, and measures frequency responses of the plurality of channels to calculate respective gain drops of the plurality of frequency responses of the plurality of channels. The positioning device is coupled to the control device and used for adjusting the relative position between the test antenna and the fixing clamp according to a first threshold value and a second threshold value, and when at least one path loss difference value is larger than the first threshold value or any one of gain drops of a plurality of frequency responses is larger than the second threshold value, the positioning device adjusts the relative position between the test antenna and the fixing clamp.
One embodiment of the present disclosure relates to another testing method for measuring wireless transmission performance of an antenna under test in a device under test, including: driving an antenna to be tested to send a wireless signal to the test antenna according to the transmission frequency band; measuring path losses of a plurality of channels of a transmission frequency band to calculate at least one path loss difference value between the plurality of different channels; measuring the frequency response of each of the plurality of channels to calculate the gain drop of each of the plurality of frequency responses of the plurality of channels; and when at least one path loss difference value is larger than a first threshold value or any one of gain drops of a plurality of frequency responses is larger than a second threshold value, driving the positioning device to adjust the relative position between the test antenna and the device to be tested.
In summary, the control device is used with program operations and the position of the test antenna is automatically adjusted by the supporting platform, so that the test antenna can be moved to a proper position relative to the antenna to be tested. In addition, the path loss is automatically calculated and compensated through the control device. Therefore, the time and error rate for adjusting the jig can be reduced, and the testing efficiency and accuracy of the testing system for the wireless transmission performance can be improved.
Drawings
FIG. 1 is a schematic diagram illustrating a test system according to some embodiments of the present disclosure;
FIG. 2 is a flow chart of a testing method according to some embodiments of the present disclosure;
FIG. 3 is a schematic diagram illustrating path loss of a wireless signal according to some embodiments of the present disclosure;
FIG. 4 is a schematic diagram illustrating a frequency response of a wireless signal according to some other embodiments of the present disclosure; and
FIG. 5 is a detailed flow chart of a testing method according to other embodiments of the present disclosure.
Description of reference numerals:
110 fixing clamp
120 control device
140 positioning device
160 test antenna
180 wireless signal tester
200 test method
S210-260, S261-S265 steps
DUT device under test
AT antenna to be tested
D1 driver
M1, M2 stepping motor
CP bearing platform
SB shielded cell
S1 Wireless Signal
X, Y, Z direction
TH1, TH2 threshold
CH1, CH2, CH3 channels
PL1, PL2 Path loss values
PLd path loss difference
F1 first frequency point
FRh, FRl frequency response gain value
FRd frequency response gain drop
Detailed Description
The concepts of the present disclosure will be apparent from the accompanying drawings and detailed description, which are included to provide further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the description given herein.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
As used herein, "and/or" includes any and all combinations of the described items.
With respect to the term (terms) used herein, it is generally understood that each term has its ordinary meaning in the art, in the disclosure herein, and in the specific context, unless otherwise indicated. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.
Please refer to fig. 1. FIG. 1 is a schematic diagram illustrating a test system according to some embodiments of the present disclosure. As shown in fig. 1, the test system includes a fixing jig 110, a control device 120, a positioning device 140, and a test antenna 160. The positioning device 140 includes a plurality of stepping motors M1, M2, a driver D1, and a loading platform CP. In some embodiments, the test system further includes a wireless signal tester 180. In other embodiments, the test system further comprises a shielding box SB.
Structurally, the shielding box SB houses therein the fixing jig 110, the device under test DUT, the carrier platform CP and the test antenna 160. The positioning device 140 is linked with the test antenna AT or the fixing clamp. Specifically, the driver D1 of the positioning device 140 is coupled to a plurality of stepping motors M1, M2. The stepping motors M1 and M2 are provided in different axial directions. The load-bearing platform CP of the positioning device 140 is disposed adjacent to the stationary fixture and moves along multiple axes of the stepper motors M1, M2. In addition, the control device 120 is coupled to the test antenna 160 and the antenna to be tested AT, respectively. Specifically, the control device 120 is coupled to the test antenna 160 through the wireless signal tester 180.
In practice, the control device 120 can be implemented by a desktop computer, a notebook computer, a Field Programmable Gate Array (FPGA), or other devices with computing functions. The wireless signal tester 180 may be MT 8870A. The test antenna 160 may be a Planar antenna (e.g., Planar inverted-F antenna). For example, in some embodiments, the first end of the control device 120 may be coupled to the wireless signal tester 180 via a General Purpose Interface Bus (GPIB) or an Ethernet cable. The output end of the wireless signal tester 180 is coupled to the test antenna 160 through a Radio Frequency (RF) cable. The second terminal of the control device 120 may be coupled to the DUT through a Universal Serial Bus (USB) or a Communication Port (COM Port). In addition, the third terminal of the control device 120 may be coupled to the driver D1 of the positioning device 140 through a universal serial bus or an ethernet cable.
Furthermore, it should be noted that the above-mentioned devices, elements and their connections are only examples for convenience of description and are not intended to limit the present disclosure. Those skilled in the art can adjust the method according to actual needs.
In operation, the test system is used to measure the wireless transmission performance of the antenna under test AT in the device under test DUT. The fixture 110 is used to fix the DUT. The test antenna 160 is used for wireless transmission with the antenna AT to be tested. In other words, the test antenna 160 is used to receive the wireless signal S1 sent by the antenna under test AT according to the transmission frequency band. The control device 120 is configured to drive the AT to-be-tested antenna to send the wireless signal S1 to the test antenna 160, measure the Path Loss (Path Loss) to calculate the Path Loss difference, and measure the Frequency Response (Frequency Response) to calculate the Frequency Response gain difference. Next, the control device 120 is used to determine whether the path loss difference or the frequency response gain difference is greater than a predetermined threshold value, so as to determine whether to drive the positioning device 140 to adjust the relative position between the test antenna 160 and the fixing fixture 110. In other words, the positioning device 140 is configured to adjust the relative position between the test antenna 160 and the fixing clamp 110 according to the first threshold and the second threshold.
Specifically, the control device 120 is configured to drive the AT to be tested to transmit the wireless signal S1 according to the transmission frequency band. When the test antenna 160 receives the wireless signal S1, the control device 120 measures path losses of a plurality of channels of the transmission band to calculate at least one path loss difference between the different channels. In addition, the control device 120 measures the frequency response of each channel to calculate a gain step of the frequency response of each channel. When at least one path loss difference is greater than the first threshold TH1, or any one of the gain drops of the frequency responses is greater than the second threshold TH2, the control device 120 drives the positioning device 140 to adjust the relative position between the test antenna 160 and the fixing fixture 110. Further details of operation will be described in subsequent paragraphs.
For the sake of illustration, the detailed operation of each component in the test system will be described in the following paragraphs with reference to the drawings. Please refer to fig. 1 and fig. 2 together. FIG. 2 is a flow chart illustrating a testing method 200 according to some embodiments of the present disclosure. The test method 200 includes operations S210, S220, S230, S240, S250, and S260.
First, in operation S210, the positioning device 140 is driven by the control device 120 to adjust the relative position between the test antenna 160 and the device under test DUT. Specifically, the plurality of stepping motors M1, M2 are controlled by the controller 120 via the driver D1 of the positioner 140. The stepping motors M1 and M2 move the platform CP along the axes of the stepping motors M1 and M2 according to the command of the driver D1. The platform CP carries the test antenna 160, so that the test antenna 160 moves along with the platform CP. And the fixture 110 holds a device under test DUT including an antenna under test AT. Accordingly, the control device 120 can adjust the position of the supporting platform CP through the positioning device 140 to adjust the relative positions of the test antenna 160 and the antenna under test AT in the device under test DUT.
For example, as shown in fig. 1, the control device 120 can drive the driver D1 in the positioning device 140 to control the stepping motor M1 to adjust the position of the carrier CP on the X axis and the stepping motor M2 to adjust the position of the carrier CP on the Y axis. In addition, in some other embodiments, when the height of the device under test DUT is much higher than the test antenna 160, the control device 120 can drive the driver D1 in the positioning device 140 to control the Z-axis stepping motor (not shown) to adjust the height of the supporting platform CP in the vertical direction, so as to automatically adjust the relative positions of the test antenna 160 and the antenna under test AT in the device under test DUT.
It should be noted that the number and the arrangement direction of the stepping motors are only examples, and the disclosure is not limited thereto. Those skilled in the art can adjust the method according to actual needs.
Next, in operation S220, the control device 120 drives the AT to be tested to send the wireless signal S1 to the test antenna 160 according to the transmission frequency band. Specifically, in some embodiments, the transmission band may be 802.11ac (5170 MHz-5835 MHz), but the disclosure is not limited thereto.
Next, in operation S230, the control device 120 measures path losses of a plurality of channels of the transmission frequency band to calculate one or more path loss difference values between the different channels. Specifically, in some embodiments, the control device 120 measures the wireless signal S1 received by the test antenna 160 through the wireless signal tester 180.
Please refer to fig. 3. Fig. 3 is a schematic diagram illustrating path loss of a wireless signal according to some embodiments of the present disclosure. As shown in fig. 3, the control device 120 measures the path loss of a plurality of channels in the transmission band (for example, 5150MHz to 5350MHz), and calculates the path loss difference by averaging the path loss values of the respective channels.
For example, the control device 120 measures a first path loss value PL1 of a first channel CH1 in the transmission band, and the control device 120 measures a second path loss value PL2 of a second channel CH2 in the transmission band. Next, the control device 120 calculates a path loss difference PLd between the first channel CH1 and the second channel CH2 according to the difference between the first path loss value PL1 and the second path loss value PL 2.
Next, in operation S240, the frequency response of each channel is measured by the control device 120 to calculate a gain step for each of the plurality of frequency responses of the plurality of channels. Specifically, the control device 120 measures the lowest gain value and the highest gain value of the frequency response of each channel. Then, the control device 120 calculates the gain step of the frequency response of each channel according to the difference between the highest gain value and the lowest gain value.
For example, as shown in FIG. 4, a third channel CH3 in the transmission band has a center frequency point F1 of about 5210MHz, and the bandwidth of the third channel CH3 is about 5200MHz to 5220 MHz. The lowest gain value FRl and the highest gain value FRh of the frequency response of this channel CH3 are measured by the control means 120. In this way, the control device 120 can subtract the highest gain value FRh and the lowest gain value FRl to calculate the frequency response gain drop FRd of the channel CH 3.
Next, in operation S250, the control device 120 determines whether at least one path loss difference PLd is greater than a first threshold TH1 or whether any one of the gain drops FRd of the plurality of frequency responses is greater than a second threshold TH 2. When at least one path loss difference PLd is greater than the first threshold TH1 or any one of the gain drops FRd of the plurality of frequency responses is greater than the second threshold TH2, operation S210 is performed. When the at least one path loss difference PLd is less than or equal to the first threshold TH1 and the gain drops FRd of the plurality of frequency responses are less than or equal to the second threshold TH2, operation S260 is performed.
For example, in some embodiments, the first threshold value TH1 may be about 2 dB. When the path loss value of the first channel CH1 is about 19dB and the path loss value of the second channel CH2 is about 16dB, the path loss difference PLd between the first channel CH1 and the second channel CH2 is about 3dB and greater than the first threshold value TH 1. Accordingly, the positioning device 140 is driven by the control device 120 to adjust the relative position between the test antenna 160 and the fixing jig 110 again.
For another example, in some embodiments, the second threshold TH2 may be about 5 dB. When the frequency response gain drop FRd between the highest gain value FRh and the lowest gain value FRl of the frequency response of the third channel CH3 is about 7dB and is greater than the second threshold value TH2, the control device 120 drives the positioning device 140 to adjust the relative position between the test antenna 160 and the fixing clamp 110 again.
In other words, after the relative position is adjusted, the control device 120 is configured to measure at least one path loss difference PLd between the channels, measure the frequency response of each channel again, and calculate the gain drop FRd of the frequency response of each channel again. If at least one path loss difference PLd is still greater than the first threshold TH1 or any one of the gain drops FRd of the frequency responses is greater than the second threshold TH2, the control device 120 is configured to drive the positioning device 140 again to adjust the relative position.
In some other embodiments, when the path loss difference PLd between different channels is less than or equal to the first threshold TH1 and the gain drop FRd of the frequency response of each channel is less than or equal to the second threshold TH2, the control device 120 does not need to adjust the position of the loading platform CP and prepares to perform the compensation value operation of the next stage. In other words, when the path loss values between the different channels are relatively flat enough and the frequency response gain drop of each channel is also flat enough, the control device 120 determines that the position between the test antenna 160 and the antenna AT to be tested is the best position.
In this way, the control device 120 automatically adjusts the position of the test antenna 160, so as to determine whether the relative position between the test antenna 160 and the AT antenna is the optimal position according to the measurement result of the wireless signal.
Finally, a plurality of path loss compensation values for the plurality of channels are calculated by the control device 120 according to the plurality of target power values for the plurality of channels in operation S260. Specifically, please refer to fig. 5. Fig. 5 is a detailed flowchart of operation S260 of the testing method 200 according to other embodiments of the disclosure. As shown in fig. 5, operation S260 includes operations S261, S262, S263, S264, and S265.
In operation S261, the compensation table is read by the control device 120. The compensation table contains a plurality of initial path loss compensation values for a plurality of channels.
Next, in operation S262, the control device 120 compensates the wireless signals S1 transmitted and received through the plurality of channels according to the compensation table, and then measures a plurality of actual transmission and reception power values of the plurality of channels.
Next, in operation S263, the control device 120 compares the actual transceiving power values and the target power values to generate a plurality of error values.
Next, in operation S264, the control device 120 determines whether the error values are greater than a third threshold value. When the plurality of error values are greater than the third threshold value, operation S265 is performed. In operation S265, a plurality of path loss compensation values are calculated by the control device 120 according to the plurality of error values, and the compensation table is updated according to the plurality of path loss compensation values. And when the error values are not larger than the third threshold value, completing compensation and ending.
Please refer to table one. The table is a test result of the wireless signal transmitted from the AT antenna under test according to some embodiments of the disclosure.
Watch 1
As shown in table one, in some embodiments, the target power level at frequency point 2412MHz in the transmission band is 16.00 dBm. After the control device 120 reads the corresponding initial path loss compensation value in the compensation table to compensate the transmitted and received wireless signal, the control device 120 measures that the first actual transmission and reception power value at the frequency point 2412MHz in the transmission band is 20.25 dBm. Therefore, the control device 120 calculates the first error value to be-4.25 (dBm) from 16.00 to 25.25.
If the control device 120 determines that the first error value-4.25 dBm is greater than the third threshold, the control device 120 calculates a first path loss compensation value at a frequency point 2412MHz in the transmission frequency band according to the first error value, and updates the compensation table according to the first path loss compensation value. Then, after the control device 120 reads the first path loss compensation value in the updated compensation table to compensate the transmitted and received wireless signal, the control device 120 measures and obtains a second actual transmission and reception power value of 16.09dBm at a frequency point 2412MHz in the transmission band. Therefore, second error value 16.00-16.09 is calculated to be-0.09 (dBm) by control device 120. And so on, until the control device 120 determines that the error value is not greater than the third threshold, the compensation is completed and the process is ended.
Accordingly, the following table two can be obtained by the above compensation. The table ii is the updated final path loss compensation value of the antenna to be measured AT obtained according to some embodiments of the present disclosure.
| Frequency point (MHz) | Path loss compensation value (dBm) |
| 2400.00 | 25.80 |
| 2412.00 | 25.80 |
| 2437.00 | 25.92 |
| 2462.00 | 25.87 |
| 2500.00 | 25.97 |
| 5180.00 | 31.98 |
| 5190.00 | 32.00 |
| 5210.00 | 32.04 |
| 5500.00 | 31.10 |
| 5510.00 | 31.07 |
| 5530.00 | 31.02 |
| 5775.00 | 30.21 |
| 5795.00 | 30.21 |
| 5825.00 | 30.21 |
Watch two
For example, in some embodiments, the third threshold value for the error value of the transmit power is approximately plus or minus 0.1 dB. And a third threshold value for the error value of the received power is approximately plus or minus 0.5 dB. In other words, if the error value of one of the transmission power or the reception power fails to meet the predetermined threshold, the control device 120 performs the multiple path loss compensation operations, so that the actual transceiving power value after the path loss compensation is closer to the target power value. In this way, it can be observed whether the actual transceiving power value of the wireless signal S1 is close to the target power value, thereby completing the mechanism of automatic path compensation.
In summary, the control device 120 cooperates with the program operation and automatically adjusts the position of the test antenna 160 through the loading platform CP, so that the test antenna 160 can be moved to a proper relative position with the antenna to be tested AT. In addition, the path loss is automatically calculated and compensated by the control device 120. Therefore, the time and error rate for adjusting the jig can be reduced, and the testing efficiency and accuracy of the testing system for the wireless transmission performance can be improved.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A test system for measuring wireless transmission performance of an antenna under test in a device under test, the test system comprising:
a fixing clamp for fixing the device to be tested;
a test antenna for receiving a wireless signal transmitted by the antenna to be tested according to a transmission frequency band;
a control device, coupled to the test antenna and the antenna to be tested, for measuring path losses of a plurality of channels of the transmission band when the test antenna receives the wireless signal, obtaining an average value of the path losses of the plurality of channels as a plurality of path loss values, calculating at least one path loss difference between the plurality of channels with the plurality of path loss values, measuring a frequency response lowest gain value and a frequency response highest gain value of each of the plurality of channels, and calculating respective gain drops of the plurality of frequency responses of the plurality of channels with the difference between the highest gain value and the lowest gain value; and
a positioning device coupled to the control device for adjusting a relative position between the test antenna and the fixing clamp according to a first threshold and a second threshold,
when any one of the at least one path loss difference value is greater than the first threshold value or any one of the gain drops of the multiple frequency responses is greater than the second threshold value, the positioning device adjusts the relative position between the test antenna and the fixing clamp.
2. The test system of claim 1, wherein the control device is further configured to:
when the at least one path loss difference value is smaller than or equal to the first threshold value and the gain drops of the multiple frequency responses are smaller than or equal to the second threshold value, multiple path loss compensation values of the multiple channels are calculated according to multiple target power values of the multiple channels.
3. The testing system of claim 2, wherein when the control device calculates the pathloss compensation values for the channels based on the channel target power values, the control device is further configured to:
reading a compensation table, wherein the compensation table comprises a plurality of initial path loss compensation values of the plurality of channels;
compensating the wireless signals transmitted and received by the plurality of channels according to the compensation table, and measuring a plurality of actual transmitting and receiving power values of the plurality of channels;
comparing the actual transceiving power values with the target power values to generate a plurality of error values;
judging whether the error values are larger than a third threshold value;
when the error values are larger than the third threshold value, calculating a plurality of path loss compensation values according to the error values; and
and updating the compensation table according to the path loss compensation values.
4. The test system of claim 1, wherein after driving the positioning device to adjust the relative position between the test antenna and the fixture, the control device is further configured to:
after the relative position is adjusted, re-measuring at least one path loss difference value among the channels, re-measuring the frequency responses of the channels, and re-calculating the respective gain drops of the frequency responses of the channels; and
if any one of the at least one path loss difference values is still larger than the first threshold value or any one of the gain drops of the multiple frequency responses is larger than the second threshold value, the positioning device is driven again to adjust the relative position.
5. The test system of claim 1, further comprising:
and the control device measures the wireless signal received by the test antenna through the wireless signal tester.
6. The test system of claim 1, wherein the positioning device further comprises:
a bearing platform adjacent to the fixing clamp for bearing the test antenna;
the stepping motors are respectively provided with a plurality of different axial directions and used for driving the bearing platform to move along the axial directions; and
and the control device controls the plurality of stepping motors through the driver.
7. A testing method for measuring wireless transmission performance of an antenna under test in a device under test, the testing method comprising:
driving the antenna to be tested to send a wireless signal to a test antenna according to a transmission frequency band;
measuring path losses of a plurality of channels of the transmission frequency band, obtaining an average value of the path losses of the plurality of channels as a plurality of path loss values, and calculating at least one path loss difference value between the plurality of different channels according to the plurality of path loss values;
measuring a frequency response lowest gain value and a frequency response highest gain value of each channel, and calculating the gain difference of each frequency response of the channels according to the difference value of the highest gain value and the lowest gain value; and
when any one of the at least one path loss difference value is larger than a first threshold value or any one of the gain drops of the multiple frequency responses is larger than a second threshold value, a positioning device is driven to adjust a relative position between the test antenna and the device to be tested.
8. The test method of claim 7, further comprising:
when the at least one path loss difference value is smaller than or equal to the first threshold value and the gain drops of the multiple frequency responses are smaller than or equal to the second threshold value, multiple path loss compensation values of the multiple channels are calculated according to multiple target power values of the multiple channels.
9. The method of claim 8, wherein calculating the pathloss compensation values for the channels based on the channel target power values further comprises:
reading a compensation table, wherein the compensation table comprises a plurality of initial path loss compensation values of the plurality of channels;
compensating the wireless signals transmitted and received by the plurality of channels according to the compensation table, and measuring a plurality of actual transmitting and receiving power values of the plurality of channels;
comparing the actual transceiving power values with the target power values to generate a plurality of error values;
judging whether the error values are larger than a third threshold value;
when the error values are larger than the third threshold value, calculating a plurality of path loss compensation values according to the error values; and
and updating the compensation table according to the path loss compensation values.
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| CN112649677A (en) * | 2020-12-16 | 2021-04-13 | 深圳市新益技术有限公司 | Antenna testing method and system |
| CN114401210B (en) * | 2022-01-07 | 2023-08-15 | 立讯智造(浙江)有限公司 | Testing method of wearable device |
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2018
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2019
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| TWI678541B (en) | 2019-12-01 |
| CN110784273A (en) | 2020-02-11 |
| TW202007996A (en) | 2020-02-16 |
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