Anechoic chamber reconfigurable stripline for EMC testing

Abstract

The anechoic reconfigurable stripline used for electromagnetic compatibility test mainly includes an anechoic chamber (10), a feed source (20), a suspension guide strip array (30), a load device (40) and a flat speaker (50); the suspension guide The band (30), darkroom (10) and loader (40) constitute the stripline; the suspension conduction strip (30) is the inner conductor of the stripline, and the darkroom (10) is the outer conductor of the stripline; the suspension The width, height and horizontal position of the conduction strip (30) can be adjusted in the darkroom (10), so that the structure and impedance of the stripline can be reconfigured; the impedance value of the load (40) can be reconfigured by switching, so that the stripline The load on the stripline is as close as possible to the impedance of the stripline. While ensuring the uniformity of the field strength in the tested area, the device can effectively increase the field strength in the tested area, improve the excitation efficiency, and reduce the test cost; the test device is movable and easy 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 strip line for electromagnetic compatibility testing. Background technique [0002] The purpose of electromagnetic compatibility testing is to test the sensitivity of the electrical and electronic products or systems (collectively referred to as the test pieces) to external electromagnetic fields. Due to the various electromagnetic environments that may be encountered during driving, the relevant standards stipulate that the frequency range of the radio frequency radiation immunity test for automotive electromagnetic compatibility is 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, the shielded room uses metal conductors as isolation material. On the other hand, the field strength of the test area where the test piece is located needs to be unif...

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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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