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Linear method using GIEM chamber to make radiation EMI test

A technique of linear method and system of linear equations, applied in the field of linear method, which can solve the problems of complex solution process, inability to solve, and inability to choose arbitrarily.

Inactive Publication Date: 2004-05-05
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 using GIEM chamber to make radiation EMI test
  • Linear method using GIEM chamber to make radiation EMI test
  • Linear method using 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 at its widest point, and about 2 meters at its highest point. In theory, it is a rectangular cone coaxial transmission line model, and its structure and coordinates are shown in Figure 1 (a) and (b). The principle of EMI test using linear method in GTEM room is as follows:

[0018] According to the theory of microwave transmission line, the reverse output power b of the zero-order mode (TEM mode) of the electrically small radiator placed on the center line of the GTEM chamber 0 The expression is:

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

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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 radiated 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 kinds of tests, the test results in the open field have been used as the standard internationally for decades. Even now, when the test results of other fields conflict with the open field results, the open field results shall prevail. However, with the increasingly serious electromagnetic pollution in urban space, it is increasingly difficult to find an open field free of electromagnetic pollution. As a result, people gradually use shielded semi-dark rooms instead of open fields for radiation interference and radiation sensitivity experiments. Because the price of building a shielded semi-dark room is relatively expensive, people hav...

Claims

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Application Information

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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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