CN101183128B - Method and device for testing power capacity of duplexer - Google Patents

Abstract

The invention discloses a method and device for testing the power capacity of a duplexer, which includes the following steps: the first step is to select a test point located in the transition zone of the duplexer, and record the test point and the point to be tested in the band The insertion loss difference; the second step, test the power capacity of the test point; the third step, calculate the sum of the insertion loss difference and the power capacity measured in the second step, and the sum is the in-band standby The power capacity of the measuring point. According to the working characteristics of the duplexer, the present invention indirectly obtains the power capacity of the point to be measured in the band by testing the power capacity of a certain point in the transition zone and according to the relationship between the insertion loss difference between the point to be tested in the band and the test point in the transition zone, and overcomes the problem of It eliminates the trouble of adjusting hardware input devices (power amplifiers, etc.) when testing duplexers with high power capacity, facilitates module testing, and reduces testing costs to a greater extent.

Description

Method and device for testing power capacity of duplexer

technical field

The invention relates to a method and device for measuring a radio frequency module in the field of mobile communication, more specifically, a method and device for testing based on the power capacity of a duplexer.

Background technique

With the rapid development of mobile communication, people have higher and higher requirements for the coverage of mobile communication service signals. In addition to arranging relatively dense mobile communication equipment according to network planning, there is another way to use as little as possible on the basis of existing technologies. Mobile communication equipment to achieve this purpose. Therefore, there are relatively high requirements for the transmission power of mobile communication equipment, which leads to higher and higher requirements for the power capacity of duplexers in mobile communication equipment. How to use a relatively simple and general method to test high power capacity The duplexer is imminent.

In the actual duplexer test, in order to test the power capacity of different duplexers, in the existing test method, the hardware device of the duplexer input excitation signal must be replaced/adjusted according to the power capacity of the duplexer during the test , which not only brings great inconvenience to the test, but also increases the test cost to a greater extent. Therefore, it is necessary to improve its testing method.

Contents of the invention

In order to overcome the problems and defects in the prior art of constantly replacing test hardware equipment, the present invention provides a simple and universal test method and device for duplexer power capacity. In order to solve the above problems, the present invention adopts the following technical solutions.

The test method of the present invention comprises the following steps: A, select a test point positioned at the duplexer transition zone, and record the insertion loss difference between the test point and the point to be tested in the band; B, test the power of the test point Capacity; C. Calculate the sum of the insertion loss difference and the power capacity measured in step B, and the sum is the power capacity of the point to be measured in the band.

Wherein, in the step A, the insertion loss difference is measured by respectively connecting the input and output ends of the duplexer to be measured to the insertion loss difference testing equipment. Wherein, in the step A, the test point located in the transition zone of the duplexer is selected according to the rated power capacity of the duplexer to be measured. Wherein, in the step A, the test point is any point located in the transition zone, and the transition zone refers to the interval between the point where the phase changes suddenly (ie, the cut-off point of the transition zone) and the outside of the passband. Wherein, in the step A, the in-band test point is a test frequency point of the duplexer to be measured, such as a center frequency point. Wherein, in the step B, the power capacity is measured by the power capacity testing equipment. Wherein, the insertion loss difference testing device is a vector network analyzer.

The device using the above method includes: power capacity testing equipment, used to test the power capacity of a certain point in the duplexer band; insertion loss difference testing equipment, used to test and obtain the insertion of two points in the duplexer band and the transition band Loss difference: the input and output terminals of the duplexer to be tested are respectively connected to the power capacity testing equipment and the insertion loss difference testing equipment through a switching device. Wherein, the switching device can use a radio frequency switch for automatic switching, or the switching device is a connection line for manually switching the connection between the duplexer to be tested and the power capacity testing equipment and insertion loss difference testing equipment .

The testing principle of the present invention is exactly according to the operating characteristics of the duplexer, by testing the power capacity of a certain point in the transition zone and according to the insertion loss difference relationship between the point to be tested in the band and the test point in the transition zone, indirectly obtain the power of the point to be tested in the band Power Capacity. Compared with the prior art, by using the method and device of the present invention, for testing duplexers with different power capacities, selecting a hardware device with a certain ability to stimulate output can meet the relatively large requirements of duplexer power capacity testing . Therefore, the present invention can reduce the requirement for input excitation equipment when duplexers with high power capacity are tested, and overcome the trouble of adjusting hardware input devices (power amplifiers, etc.) when testing duplexers with high power capacity, which facilitates the Test, while reducing the cost of testing to a greater extent.

Description of drawings

Fig. 1 is a schematic diagram of the connection between the duplexer to be tested and all test equipment in the present invention.

Fig. 2 is a structural diagram of a device for testing a duplexer with a power capacity of 100W in a specific embodiment.

Detailed ways

Various preferred embodiments of the present invention are described in detail below.

As shown in Figure 1, the present invention provides a method for indirectly measuring the power capacity of a duplexer based on the operating characteristics of the duplexer, which specifically operates as follows:

The first step is to connect the input and output ends of the duplexer to be measured to the insertion loss difference test equipment respectively, and then select a test point B located in the transition zone of the duplexer according to the rated power capacity of the duplexer ( The point to be measured in the next step), and then record the insertion loss difference X1 between point B and point A of the in-band test (the point that needs to measure data, that is, any point in the passband);

The second step is to switch by manual switching or automatic switching equipment, connect the input and output terminals of the duplexer to the power capacity test equipment respectively, and test the power capacity of point B in the transition zone to obtain point B The power capacity of X2;

In the third step, the insertion loss difference X1 is added to the power capacity X2 measured in the second step to obtain the power capacity value of point A in the in-band test.

In the above process, the point A to be measured in the band can be any point in the passband, such as the center frequency point of the duplexer to be measured, and the selected point B in the transition band can be any point in the transition band. One point refers to any point between the point where the phase changes suddenly (that is, the point where the phase changes from positive to negative or from negative to positive) and outside the passband, where the point where the phase changes suddenly also refers to the cut-off point of the transition band, The above-mentioned insertion loss difference test equipment and power capacity test equipment can adopt methods and devices of the prior art, such as a vector network analyzer can be used to measure the insertion loss difference, and the power capacity can be measured by a signal source, a power amplifier and a power meter, etc. test.

The above-mentioned method is used to test a duplexer with a power capacity of 100W. The hardware test equipment is connected as shown in Figure 2. The switching device here is a single-pole double-throw RF switch, and the insertion loss difference device is analyzed by a vector network. The power capacity test equipment consists of a signal source, a power amplifier with a maximum output of 60W and a power meter.

First set up the RF switch, so that the input and output devices of the duplexer to be tested are respectively connected to the two ends of the vector network analyzer, and determine the test point B in the transition zone, which is inserted into the center frequency point A of the duplexer to be tested. The loss difference is X1=3dB. Then, set the RF switch, connect the input and output devices of the duplexer to be tested to the power capacity test equipment respectively, adjust the output signal power of the signal source, and test the power capacity of point B by observing the readings of the power meter, and finally The power capacity obtained at point B is X2=55W (equivalent to 47.4dBm). Finally, calculate the power capacity of point A at the center frequency: X2+X1=47.4+3=50.4dBm, equivalent to: 109.7W, so that the power capacity of point A is obtained, which also verifies that the power capacity of point A meets the requirements .

It can be seen that the method of the present invention avoids the trouble of changing or adjusting the hardware test equipment from time to time according to the power capacity of the duplexer brought by the direct measurement in the prior art through the indirect measurement method, reduces the measurement cost, and has the advantages of Good application prospects.

In summary, the present invention also provides a test device for duplexer power capacity, as shown in Figure 1 and Figure 2, which mainly includes the following modules:

The power capacity testing equipment is used to be responsible for testing the power capacity of a certain point of the duplexer, which can adopt a conventional method, as shown in Figure 2, a device consisting of a signal source, a power amplifier, and a power meter;

The insertion loss difference test equipment is used to test and obtain the insertion loss difference between two points in the duplexer band and the transition zone, which can select the test point and record the insertion loss difference according to the test point. In the specific test, the device mainly selects the appropriate test point located in the transition zone according to the phase change characteristics (that is, the sudden change from positive to negative), and then records the insertion loss between the test point and the required in-band test point difference; it can be used in a conventional way, as shown in Figure 2, consisting of a vector network analyzer.

The connection between the above two test equipment can be manually switched, for example, firstly unscrew the cable connected to the insertion loss difference test equipment, and then connect the input and output terminals of the duplexer to the power capacity test through the cable or, it is also possible to use automatic switching equipment switching, such as the input and output ends of the duplexer to be tested are respectively connected to the above-mentioned power capacity testing equipment and insertion loss difference testing equipment through an automatic switching equipment, the automatic switching equipment It may be a radio frequency switch, such as a single pole double throw switch.

The illustrations of the above-mentioned specific steps are relatively specific, and cannot therefore be considered as limiting the scope of the patent protection of the present invention, and the scope of protection of the patent protection of the present invention should be determined by the appended claims.

Claims (10)

1. the method for testing of a duplex device power capacity is characterized in that, said method comprising the steps of:

A, selection one are positioned at the test point of diplexer transitional zone, and write down this test point and the insertion loss difference of being with interior tested point;

The power capacity of B, the described test point of test;

C, calculate power capacity that described insertion loss difference and step B record and, itself and be exactly the power capacity of the interior tested point of described band.

2. method according to claim 1 is characterized in that, in the described steps A, is linked into respectively on the insertion loss difference testing apparatus by the input and output side with diplexer to be measured, measures described insertion loss difference.

3. method according to claim 1 is characterized in that, in the described steps A, selects to be positioned at the test point of diplexer transitional zone according to the rated power capacity of diplexer to be measured.

4. method according to claim 1 is characterized in that, in the described steps A, described test point is the cut off of transitional zone.

5. method according to claim 1 is characterized in that, in the described steps A, tested point is the center frequency points of diplexer to be measured in the described band.

6. method according to claim 1 is characterized in that, among the described step B, measures power capacity by the power capacity testing apparatus.

7. method according to claim 2 is characterized in that, described insertion loss difference testing apparatus is a vector network analyzer.

8. the proving installation of a duplex device power capacity, the power capacity that it is used to measure diplexer is characterized in that, described device comprises:

The power capacity testing apparatus is used to test the power capacity of certain test point in the diplexer transitional zone;

Insert the loss difference testing apparatus, be used to test and obtain the insertion loss difference of 2 of tested points and the described test point of transitional zone in the diplexer band;

The input of diplexer to be tested, output terminal are connected to described power capacity testing apparatus by a switching device respectively and insert on the loss difference testing apparatus;

This proving installation calculate described insertion loss difference and described test point power capacity and, itself and be exactly the power capacity of tested point in the described band.

9. device according to claim 8 is characterized in that, described switching device adopts radio-frequency (RF) switch.

10. device according to claim 8 is characterized in that described switching device is a connecting line, is used for manual switchover diplexer to be tested and described power capacity testing apparatus and inserts being connected of loss difference testing apparatus.

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