Linear method usig GIEM chamber to make radiation EMI test

A technology of linear method and equipment to be tested, applied in the field of linear method, which can solve the problems of complex solution process, inability to solve, and inability to select arbitrarily, etc.

Inactive Publication Date: 2005-07-27
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, in the past work, inconvenient assumptions were made when dealing with the phase difference between the equivalent electric and magnetic moments of the equipment under test, which made the solution process more complicated.
Some assume that the phase difference is 0, which requires more test data and sometimes the results are inconsistent and not unique. Some also regard the phase difference as an unknown quantity to solve, which makes the equation too complicated , can not be solved, only by means of many approximations, the result is worse than any assumed value
In the past method, there are also fixed requirements for the selection of the placement angle of the EUT, and it cannot be selected arbitrarily.

Method used

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  • Linear method usig GIEM chamber to make radiation EMI test
  • Linear method usig GIEM chamber to make radiation EMI test
  • Linear method usig GIEM chamber to make radiation EMI test

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Embodiment Construction

[0017] The GTEM chamber is pyramid-shaped, with a typical size of about 7 meters in length, about 3 meters in its widest point, and about 2 meters in its highest point. In theory, it is a rectangular cone coaxial transmission line model, its structure and coordinates are shown in Figure 1 (a), (b). The principle of using linear method to do EMI test in GTEM room is as follows:

[0018] According to the microwave transmission line theory, the reverse output power of the zero-order mode (TEM mode) b 0 The expression is:

[0019] b 0 = - 1 2 ( P y + j k 0 m x ) e 0 y ( o ‾ )...

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Abstract

A linear method for measuring the radiation EMI in GIEM chamber includes putting the object (EUT) to be measured on an turntable in GTEM chamber, determining the relative relation between various axises of EUT and various axises of GTEM chamber, rotating the turntable by alpha angle counterclockwise, measuring 6 data at a certain frequency but different 6 positions, using the linear equations set to find out the equivalent electric and magnetic couple moments, and calculating the radiated field intensify in wide field.

Description

technical field [0001] The invention relates to electromagnetic compatibility measurement, in particular to a linear method for radiation EMI testing using a GTEM chamber. Background technique [0002] In electromagnetic compatibility (EMC) testing, radiation emission measurement and radiation sensitivity measurement are important parts. For these two tests, the test results in the open field have been used as the standard in the world for decades. Even now, when the test results in other fields are inconsistent with the results in the open field, the open field results are still used as the standard. However, with the increasingly serious electromagnetic pollution in urban spaces, it is becoming more and more difficult to find an open field without electromagnetic pollution. As a result, people gradually use shielded semi-dark chambers instead of open fields to conduct experiments on radiation interference and radiation sensitivity. Since the price of building a shielded ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/00G01R29/08
Inventor 陈志雨任列辉
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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