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Blind Spot of wireless desense

Blind Spot of wireless desense<br>Blind Spot of wireless desense<br>Blind Spot of wireless desense

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Blind Spot of wireless desense

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  1. Usually, one situation may occur: Conducted test: No de-sense issue Wireless test: de-sense issue Since the difference between the 2 test conditions is antenna, a large number of people may assume the root cause is antenna. This assumption is completely wrong. Most antennas are passive, which doesn’t generate noise. Let’s analyze this phenomenon: 2

  2. Regarding wireless de-sense, there’re 4 elements: (1) Noise source (2) Radiator (3) Path (4) Receptor The noise source is from PCB or module itself. And then, any metal object would act as the radiator if the grounding is NOT good, thereby radiating noise to antenna. Certainly, the path is just air. Finally, the antenna acts as the receptor, thereby causing de-sense issue. That’s why there’s NO de-sense issue in conducted test since there’s no receptor. The common method is to enhance the grounding of shielding can by gasket, thereby reducing the impedance of shielding can and alleviating radiation. 2

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