Method for measuring shielding effectiveness of aviation low-frequency wire harness based on active matching network

Abstract

The invention discloses a method for measuring the shielding effectiveness of a low-frequency wire harness for aviation based on an active matching network. The method comprises the following steps: selecting a TEM cell; measuring the characteristic impedance of the low-frequency wire harness; selecting a load and a receiver; configuring an active matching network according to the characteristic impedance, the impedance of the load and the input impedance of the receiver; connecting the two ends of the low-frequency wire harness to a load and the input side of an active matching network, connecting a receiver to the output side of the active matching network, and putting the low-frequency wire harness into a TEM cell; setting the gain of the active matching network; and testing the low-frequency wire harness, and calculating the shielding effectiveness of the low-frequency wire harness based on an FRIIS formula and the signal power received by the receiver. According to the method formeasuring the shielding effectiveness of the aviation low-frequency wire harness based on the active matching network, the shielding effectiveness of the low-frequency wire harness can be accurately and quantitatively measured, and the method is easy to implement.

Description

technical field [0001] The invention relates to the test and evaluation of the electromagnetic compatibility performance of wire harnesses, in particular to a method for measuring the shielding effectiveness of aviation low-frequency wire harnesses based on an active matching network. Background technique [0002] The electromagnetic compatibility performance of wire harness is an important aspect of wire harness performance in many application fields or application environments. For example, for aviation wiring harnesses such as connectors, wires, and shielding sleeves, most of the shielding effectiveness of wiring harnesses is currently analyzed qualitatively or quantitatively by injection. However, most of the interference in actual working conditions will be induced to the wire harness through radiation, and the injection method belongs to near-field injection, which is different from the actual working conditions. Moreover, the injection method has very strict requirem...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect of the prior art that can conduct relatively accurate quantitative analysis and easy-to-implement methods for the shielding effectiveness of low-frequency wiring harnesses used in aviation, and propose a new measurement aviation based on active matching network. Methods of Shielding Effectiveness with Low Frequency Harnesses

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