Patent Application
20140184241
The disclosure generally relates to testing systems, and particularly to an electromagnetic compatibility testing system.
Electromagnetic compatibility testing systems usually include an anechoic chamber, an antenna set inside the anechoic chamber, and an amplifier and a receiver set outside the anechoic chamber. The antenna receives electromagnetic signals emitted from a test sample and transmits the electromagnetic signals to the amplifier and the receiver via a coaxial cable. However, because the amplifier and the receiver are set outside the anechoic chamber, the coaxial cable connecting the antenna to the amplifier is often long, and the electromagnetic signals may be significantly attenuated, which adversely affects accuracy of test results of the electromagnetic signals.
Therefore, it is desirable to provide a means to overcome the above-mentioned problems.
Many aspects of the disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the views.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references can mean “at least one.”
The anechoic chamber 10 includes a testing part 100, a shielding part 102, and a shielding board 104 set between the testing part 100 and the shielding part 102. The shielding board 104 includes a grounded shielding sheet 1040 set on a surface of the shielding board 104 facing the testing part 100. The shielding sheet 1040 is made of a conductive material, such as copper, iron, or aluminum. The testing table 20 and the antenna 30 are set inside the anechoic chamber 10. The amplifier 40 and the receiver 50 are located inside the shielding part 102 to reduce interaction between the test sample 3 and the amplifier 40 or between the test sample 3 and the receiver 50. In this embodiment, the testing part 100 and the shielding part 102 are oriented along a vertical direction. The testing part 100 is located above the shielding part 102 and may occupy a majority of space of the anechoic chamber 10.
In
The antenna 30 is set on a lifting device 32. A height of the antenna 30 is adjusted by the lifting device 32. Thus, the antenna 30 receives the electromagnetic signals emitted from the test sample 3 at different heights. In this embodiment, the antenna 30 is a multiple antenna having a testing frequency band in a range from about 30 megahertz (MHz) to about 1 gigahertz (GHz). In other embodiments, the antenna 30 is a horn antenna having a testing frequency band in a range from about 1 GHz to about 18 GHz.
The testing table 20 rotates 360 degrees to show different faces of the test sample 3 to the antenna 30. In this embodiment, the testing table 20 is set at a predetermined height higher than the shielding board 104 to test the test sample 3 above the shielding board 104. In other embodiments, the testing table 20 is coplanar with the shielding layer 104 to test the test sample 3 on the shielding board 104. The testing table 20 is made of an insulating material.
The computer 60 is located outside the anechoic chamber 10 and is connected to the receiver 50 via an optical fiber 62. The computer 60 provides an operating interface of the receiver 50 to allow a user to operate the receiver 50 outside the anechoic chamber 10.
Because the amplifier 40 and the receiver 50 are located inside the anechoic chamber 10, a length of the coaxial cable 42 for transmitting signals is shortened. Thus, an attenuation of the transmitted signals is reduced, and an equipment cost is lowered. In addition, electromagnetic signals from outside the anechoic chamber 10 are prevented from affecting the amplifier 40 and the receiver 50.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2012105834439 | Dec 2012 | CN | national |
