Patent Application
20150331022
The present invention relates to a mobile communication terminal, and more particularly to a method for quickly testing a total radiated power of an antenna of a terminal.
Nowadays, in the radio frequency performance test of wireless terminals (such as mobile phones), the test of the radio frequency performance of a whole terminal has been more and more concerned. The radio frequency performance reflects performances of transmitting and receiving of the mobile phones. In the prior art, there are two methods for testing the radio frequency performance of the mobile phones. One of the methods is determining the radio frequency performance of an antenna, and it is a conventional antenna testing method, which is called a passive test. The other method is testing the radiated power and receiving sensitivity of a mobile phone in a particular microwave anechoic chamber, which is called an active test. An OTA (Over the Air) test belongs to the active test. In the prior art, the basic working process of testing the radiated performance of the antenna by an OTA test system is as follows:
1. A terminal is disposed upon a rotary table in the anechoic chamber, and is connected with a base station emulator by an antenna. Signals emitted from the base station emulator are transmitted to the terminal by a chamber measuring antenna. The emitted signals are received and de ed by a receiving system of the terminal.
2. The terminal on the rotary table is moved to different rotary table Θ (Theta) angles and Φ (Phi) angles sequentially, and a polarization direction of the measuring antenna to be tested is correspondingly adjusted in each angle. In each Θ angle and Φ angle, the polarization positions of the measuring antenna should be adjusted twice (i.e. horizontal and perpendicular polarization directions). Normally, in test system of the antenna of the terminal, the Θ angle of the rotary table should be tested from 0 to 180 degrees, and each 30 degrees is one step, and there are 6 steps. The Φ angle should be tested from 0 to 360 degrees, and each 30 degrees is one step, and there are 12 steps. In addition, in the OTA chamber, the horizontal and perpendicular polarization directions of the measuring antenna are utilized, so that the total test points are 6×12×2=144.
3. At each test point, power transmitted from the terminal is measured by the base station emulator or a spectrum analyzer of the test system, and the measured power is ERP (Effective Radiated Power). The power of each channel to be tested will be tested for each test point, so that the test time of each test point is: T=Tpower×Nthe number of total channels to be tested+Ttime of changing channels×(Nthe number of total channels to be tested−1).
4. After obtaining the ER of each test point, the ERP is compensated with a path loss of the chamber (at a fixed frequency point and in one antenna polarization direction in the chamber, the path loss is a fixed offset value), and integral calculation is executed to obtain a final antenna TRP (Total Radiated Power). The formula is as follows:
Where N is the number of test points of the rotary table Theta (Θ) angle, per 30° is one step, and N=6. M is the number of test points of the rotary table Phi (Φ) angle, per 30° is one step, and M=12.
Obviously, the calculation in testing the TRP of terminals by the conventional OTA test system is complicated, and a long testing time is needed, thereby increasing testing costs.
Therefore, the prior art needs to be improved and developed.
In view of the deficiencies of the prior art as described above, in order to overcome the defects and deficiencies of the prior art, the present invention provides a method for quickly testing a TRP of an antenna, which takes less time to test the radiated performance of the antenna of the terminal by an OTA test system, so that the testing efficiency is improved.
The present invention adopts the following technical solutions for solving the technical problems.
A method for quickly testing a total radiated power of an antenna of a terminal comprises: looking up a first antenna polarization direction from a pre-stored transmission power intensity and direction pattern, where the first antenna polarization direction corresponds to a Θ angle and a Φ angle which conform with a prescribed requirement; rotating a rotary table to a direction corresponding to the first antenna polarization direction; measuring equivalent radiated powers of all channels to be tested in the first antenna polarization direction; compensating the equivalent radiated power with a path loss of a chamber, thereby obtaining ERPbest,CHi; calculating ERPCHi according to a formula ERPCHi=ERP+(ERPbest,CHi−ERPbest), where ERPCHi is the equivalent radiated power of each channel to be tested, ERPbest is a transmitted power at a test point which conforms with the prescribed requirement in the transmission power intensity and direction pattern, the ERP is an equivalent radiated power of the channel to be tested in a current antenna polarization direction; and integral calculating and obtaining TRPCHi according to a formula
where N is the number of test points corresponding to the Θ angle, M is the number of test points corresponding to the Φ angle, and i and j are integer numbers; where a working channel is set at a middle value of all channels to be tested, the antenna polarization direction comprises a horizontal polarization direction and a perpendicular polarization direction.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: composing the equivalent radiated powers of all test points into the transmission power intensity and direction pattern and storing the same, where each Θ angle and each Φ angle corresponding to the antenna polarization direction is served as one of the test points.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: rotating the terminal either to the Θ angle or the Φ angle by rotating the rotary table; testing the equivalent radiated power at each of the test points, where the equivalent radiated power of the test point corresponds to power of the test point in one channel, and a rotation to either the Θ angle or the Φ angle corresponds to a variation of the antenna polarization direction.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: transmitting a signal emitted from a base station emulator to the terminal by a measuring antenna in the chamber, where the terminal is disposed upon the rotary table in the chamber, and the terminal is connected with the base station emulator by the antenna; and setting any one of the channels to be tested as the working channel of the base station emulator.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: sampling and testing the equivalent radiated power of the test point according to the transmission power intensity and direction pattern; and correcting the transmission power intensity and direction pattern by using a difference value from an original equivalent radiated power.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: finding a test point with a best equivalent radiated power ERPori for each Θ angle; looking up a Φ angle and an antenna polarization direction corresponding to the ERPori, and then rotating to the corresponding antenna polarization direction; testing an equivalent radiated power ERPnew; calculating the difference value between the ERPnew and the ERPori by a formula offset=ERPnew−ERPori; re-correcting the equivalent radiated power by a correction formula ERPnew,phi,polar=ERPori,phi,polar+offset, thereby obtaining the optimized equivalent radiated power ERPnew,phi,polar of the test point, where ERPori,phi,polar represents the original equivalent radiated power in the antenna polarization direction corresponding to the Θ angle and the Φ angle in the transmission power intensity and direction pattern; correcting the transmission power intensity and direction pattern by repeating above steps for other Θ angles.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal, a range of the Θ angle is between 0 and 180 degrees, each 30 degrees is one step, and there are 6 steps.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal, a range of the Φ angle is between 0 and 360 degrees, each 30 degrees is one step, and there are 12 steps.
A method for quickly testing a total radiated power of an antenna of a terminal comprises: looking up a first antenna polarization direction from a prestored transmission power intensity and direction pattern, where the first antenna polarization direction corresponds to a Θ angle and a Φ angle which conform with a prescribed requirement; rotating a rotary table to a direction corresponding to the first antenna polarization direction; measuring equivalent radiated powers of all channels to be tested in the first antenna polarization direction; compensating the equivalent radiated power with a path loss of a chamber, thereby obtaining ERPbest,CHi; calculating ERPCHi according to a formula ERPCHi=ERP+(ERPbest,CHi−ERPbest), where ERPCHi is the equivalent radiated power of each channel to be tested, ERPbest is a transmitted power at a test point which conforms with the prescribed requirement in the transmission power intensity and direction pattern, the ERP is an equivalent radiated power of the channel to be tested in a current antenna polarization direction; and integral calculating and obtaining TRPCHi according to a formula
where N is the number of test points corresponding to the Θ angle, M is the number of test points corresponding to the Φ angle, i and j are integer numbers.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: composing the equivalent radiated powers of all test points into the transmission power intensity and direction pattern and storing the same, where each Θ angle and each Φ angle corresponding to the antenna polarization direction is served as one of the test points.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: rotating the terminal either to the Θ angle or the Φ angle by rotating the rotary table; and testing the equivalent radiated power at each of the test points, where the equivalent radiated power of the test point corresponds to power of the test point in one channel, and a rotation to either the Θ angle or the Φ angle corresponds to a variation of the antenna polarization direction.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: transmitting a signal emitted from a base station emulator to the terminal by a measuring antenna in the chamber, where the terminal is disposed upon the rotary table in the chamber, and the terminal is connected with the base station emulator by the antenna; and setting any one of the channels to be tested as the working channel of the base station emulator.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal, a working channel is set at a middle value of all channels to be tested.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal, the antenna polarization direction comprises a horizontal polarization direction and a perpendicular polarization direction.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: sampling and testing the equivalent radiated power of the test point according to the transmission power intensity and direction pattern; and correcting the transmission power intensity and direction pattern by using a difference value from an original equivalent radiated power.
The above-mentioned method for quickly testing the total radiated power of the antenna of the terminal further comprises: finding a test point with a best equivalent radiated power ERPori for each Θ angle; looking up a Φ angle and an antenna polarization direction corresponding to the ERPori, and then rotating to the corresponding antenna polarization direction; testing an equivalent radiated power ERPnew; calculating the difference value between the ERPnew and the ERPori by a formula offset=ERPnew−ERPori; re-correcting the equivalent radiated power by a correction formula ERPnew,phi,polar=ERPori,phi,polar+offset, thereby obtaining the optimized equivalent radiated power ERPnew,phi,polar of the test point, where ERPori,phi,polar represents the original equivalent radiated power in the antenna polarization direction corresponding to the Θ angle and the Φ angle in the transmission power intensity and direction pattern; and correcting the transmission power intensity and direction pattern by repeating above steps for other angles.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal, a range of the Θ angle is between 0 and 180 degrees, each 30 degrees is one step, and there are 6 steps.
In the above-mentioned method for quickly testing the total radiated power of the antenna of the terminal, a range of the angle is between 0 and 360 degrees, each 30 degrees is one step, and there are 12 steps.
In comparison with the prior art, in the method of the present invention, the production process of the equivalent radiated power in two kinds of the antenna polarization directions at the Θ angle and Φ angle of each rotary table is simplified. In the meanwhile, the original transmission power intensity and direction pattern is corrected by sampling a few of the ERP of the test points, thereby obtaining a new transmission power intensity and direction pattern. The correction makes the testing result more accurate. Also, the testing efficiency of the total radiated power is increased due to the simplified calculation method, and the testing cost is therefore decreased.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described below with reference to the attached drawings and embodiments thereof. It should be understood that the embodiments described herein are only intended to in illustrate but not to limit the present invention.
A method for quickly testing a total radiated power of an antenna of a terminal and for testing a radiated performance of the antenna of the terminal in an OTA chamber comprises the following steps:
S10, a terminal is disposed upon a rotary table in a chamber, and is connected with a base station emulator by an antenna. Signals emitted from the base station emulator are transmitted to the terminal by a measuring antenna. The signals emitted from the base station emulator are received and decoded by a receiving system of the terminal. Any one of the channels to be tested is set as the working channel of the base station emulator. It should be noted that, preferably, the working channel is set at a middle value of all channels to be tested.
S20, the terminal is rotated to different rotary table Θ angles and Φ angles sequentially, and an antenna polarization direction is correspondingly adjusted in each Θ angle and Φ angle. Each Θ angle and each Φ angle corresponding to the antenna polarization direction is served as one test point. The power at each channel of each test point is tested for obtaining ERP at the corresponding test point. The antenna polarization direction comprises a horizontal polarization direction and a perpendicular polarization direction. The Θ angle of the rotary table is from 0 to 180 degrees, each 30 degrees is one step, and there are 6 steps. The Φ angle is from 0 to 360 degrees, each 30 degrees is one step, and there are 12 steps. In this step, the terminal on the rotary table is rotated to different Θ angles and Φ angles, and each rotation is based on a respective step. The antenna polarization direction is adjusted in each angle. That is, the polarization position of the antenna should be adjusted twice in each Θ angle and Φ angle. Each Θ angle and the each Φ angle in the antenna polarization direction is served as one test point.
S30, the ERPs of all test points according to step S20 are composed into the transmission power intensity and direction pattern of the antenna of the terminal and the same is stored. For further increasing the testing accuracy, the ERPs at some test points in the direction pattern may be sampled and tested according to the obtained transmission power intensity and direction pattern, and the transmission power intensity and direction pattern is corrected by using a difference value from an original ERP to form a new transmission power intensity and direction pattern. To be more specific, a test point with the best ERP is found for each Θ angle of the rotary table, representing ERPori. The Φ angle and the antenna polarization direction corresponding to the test point is found out, and then the rotary table is rotated to the corresponding antenna polarization direction of the Θ angle and Φ angle, and the ERR is re-tested, representing ERPnew. The difference value between the ERPnew and the ERPori is calculated by a formula offset=ERPnew−ERPori. The ERP in the antenna polarization direction of the Θ angle and Φ angle is re-corrected by a correction formula ERPnew,phipolar=ERPori,phi,polar+offset, thereby obtaining the optimized ERR at the test point, representing ERPnew,phi,polar, where ERPori,phi,polar represents the original ERP in the antenna polarization direction in the transmission power intensity and direction pattern in the Θ angle and the Φ angle. A new transmission power intensity and direction pattern is obtained by repeating above steps for other Θ angles, in this way, the transmission power intensity and direction pattern can be optimized, thereby increasing the testing accuracy.
S40, an antenna polarization direction with the best Θ angle and the Φ angle is found out according to the transmission power intensity and direction pattern of the antenna of the terminal. The rotary table in the chamber is rotated to the antenna polarization direction of the Θ angle and the Φ angle for testing the ERPs of all channels to tested, and then the ERP is compensated with a path loss of the chamber so as to serve as the ERP with best Θ angle and the Φ angle in the channel to be tested in the antenna polarization direction, representing ERPbest,CHi. The CHi of the ERPbest,CHi represents all of the channels to be tested.
S50, the ERP in each channel to be tested of each Θ angle and each Φ angle represents an ERPCHi, which is calculated by a formula ERPCHiERP+(ERPbest,CHi−ERPbest), where ERPbest is the transmitted power at best test point in the channel to be tested of the transmission power intensity and direction pattern, ERP is an ERP in an antenna polarization direction of the Θ angle and the Φ angle of the rotary table in a current channel to be tested of the transmission power intensity and direction pattern. An integral calculation is executed to obtain TRP of the antenna of the terminal according to a formula
where N is the number of test points of the Θ angle of the rotary table, the Φ angle is from 0 to 180 degrees, each 30 degrees is one step, and there are 6 steps. Therefore, the number of the test points of the Θ angle is 6. Similarly, M is the number of test points of the Φ angle of the rotary table, the Φ angle is from 0 to 360 degrees, each 30 degrees is one step, and there are 12 steps, and the number of the test points is 12.
For the above steps, since the transmission power intensity and direction pattern is stored white the first testing in step of S30, the steps of S20 and S30 can be omitted when re-testing instead of by using a transmission power intensity and direction pattern. In this way, the testing efficiency can be increased by the method of the present invention, and the searching time of each angle can be decreased.
It should be noted that the above descriptions are merely preferable embodiments of the present invention, but are not intended to limit the scope of the present invention. Those of ordinary skill in the art can make increases, decreases, replacements, variations, or improvements according to the above description without departing from the spirit and principle of the present invention, and all of the increases, decreases, replacements, variations, and improvements should be contained within the scope of the attached claims of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201310158536.1 | May 2013 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2013/082194 | 8/23/2013 | WO | 00 |
