Judgment method for far-field radiation limitation of printed circuit board
A printed circuit board and far-field technology, which is applied in the direction of electromagnetic field characteristics, can solve the problems of calculation amount and wide-frequency application limitation, the increase of radiation mode, the difficulty of predicting the intensity of far-field radiation, and the difficulty of methods
Inactive Publication Date: 2014-11-05
BEIHANG UNIV
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Problems solved by technology
[0013] However, this method requires a lot of time to deduce the radiation source array of the printed circuit board, and it can only be used for simple printed circuit boards at present. For a complex printed circuit board, this method is very difficult
In addition, the increasingly wide range of radiation frequencies and increasingly complex radiation patterns also increase the difficulty of predicting the intensity of far-field radiation
Therefore, the mentioned forecasting methods are limited by the amount of calculation and wide frequency application
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[0055] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0056] The method for judging the far-field radiation limit of the printed circuit board 1 of the present invention, such as figure 1 As shown, it is accomplished through the following steps:
[0057] Step 1: Obtain the near-field electromagnetic characteristic data of the printed circuit board 1;
[0058] The near-field electromagnetic characteristic data of the printed circuit board 1 is obtained through a measurement system composed of an electromagnetic scanner 2 and a spectrum analyzer 3 . Wherein, the electromagnetic scanner 2 is composed of a positioning system 201 and a near-field probe 202, and the probe 202 is installed on the positioning system 201 that can move up and down, left and right. Let the plane where the printed circuit board 1 is located be the XY plane under the Cartesian coordinate system, and the direction perpendicu...
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The invention discloses a judgment method for the far field radiation limitation of a printed circuit board. The judgment method is characterized in that a traditional near magnetic field scanning measurement device and a half-wave darkroom measurement device for the traditional printed circuit board are used for carrying out the radiation field measurement of a near field and a far field on a certain number of printed circuit boards in a broadband range, on the basis of the measurement data, collection data are ensured to meet the normal distribution of indexes by using a statistical method, and then an empirical relationship, i.e. an angle transfer function between the magnetic field intensity of the near field and the electric field intensity of the far field is established. The angle transfer function is used for converting a far field radiation limitation standard of current industrial electromagnetic compatibility into a near field radiation limitation standard, so that designers can directly judge whether the radiation of the PCB (Printed Circuit Board) exceeds the limitation while acquiring the electromagnetic property of the near field, and therefore, the development period is shortened for the designers of the printed circuit board.
Description
technical field [0001] The invention relates to the field of electromagnetic compatibility, specifically, a method for quickly judging whether a printed circuit board exceeds the far-field radiation limit in the near field of the printed circuit board. Background technique [0002] With the development of technology, more and more electronic devices use high-speed printed circuit boards (Printed Circuit Board, PCB). However, since high-speed printed circuit boards operate at high frequencies, the transient pulses they generate contain high-frequency harmonics that can emit electromagnetic interference (EMI). These high-frequency harmonics not only affect the electromagnetic compatibility (EMC) performance of the PCB, but also affect the cost of the entire product. Therefore, the electromagnetic compatibility of electronic equipment must be considered by modern electronic engineering designers when designing. Electromagnetic Compatibility Prediction Solve the electromagneti...
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IPC IPC(8): G01R29/08
Inventor 方宁
Owner BEIHANG UNIV