Darkroom reconfigurable strip line for electromagnetic compatibility test

Abstract

A darkroom reconfigurable strip line for an electromagnetic compatibility test mainly comprises a darkroom (10), a feed source (20), a suspension conduction band array (30), a loader (40) and a flat horn (50), the suspension conduction band (30), the darkroom (10) and the loader (40) form a strip line; the suspension conduction band (30) is an inner conductor of the strip line, and the darkroom (10) is an outer conductor of the strip line; the width and height of the suspension conduction band (30) and the horizontal position of the suspension conduction band (30) in the darkroom (10) can be adjusted, so that the structure and impedance of the strip line are reconfigurable; and the impedance value of the load device (40) can be switched and reconfigured by a switch, so that the load of the strip line is close to the impedance of the strip line as much as possible. According to the device, the field intensity uniformity of a tested area is ensured, the field intensity of the tested area can be effectively improved, the excitation efficiency is improved, and the test cost is reduced; and the test device is movable and convenient to use, and the lowest available frequency can be lower than 10KHz.

Description

technical field [0001] The invention relates to electromagnetic compatibility testing, in particular to a darkroom reconfigurable stripline for electromagnetic compatibility testing. Background technique [0002] The purpose of electromagnetic compatibility testing is to test the sensitivity of the tested electrical and electronic products or systems (collectively referred to as test items) to external electromagnetic fields. Since the car may encounter various electromagnetic environments while driving, the relevant standards stipulate that the frequency range of the radio frequency radiation immunity test for electromagnetic compatibility of cars is from 10kHz to 18GHz. During the test, the test device needs to be shielded so as not to interfere with the external environment. To achieve this shielding, shielded rooms use metal conductors as isolation materials. On the other hand, it is necessary to make the field strength of the test area where the test piece is located ...

AI Technical Summary

Problems solved by technology

But on the other hand, since the change of the position of the stripline conduction band will lead to the change of the impedance of the stripline, if the load impedance of the stripline cannot be adjusted according to the change of the stripline impedance, the power efficiency of the stripline test device will be relatively low. Low, not only increases the power consumption, but also affects the field strength in the tested area

At the same time, due to the limitation of the size of the darkroom, when the test frequency is very low, for example, when the test wavelength is greater than four times the length of the transition wire, if the load impedance is very different from the strip line impedance, it is usually impossible to ensure that the strip line leads to the load. Transition performance

Therefore, the above problems are more serious when the test frequency is low

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