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A single frequency point of 2.625 GHz exceeded the limit when the controller of parking auxiliary system carried out radiatied emission test of components, which did not meet the requirements of Electromagnetic Compatibility(EMC) Specs. By checking and analyzing the near and far field of the whole test link and Printed Circuit Board(PCB), it is found that the source of the noise is the Ethernet clock signal on PCB, and the clock and corresponding chip are not applied in this parking auxiliary system. The clock signal is radiated through the unintentional antenna formed by the broken line on the PCB board, resulting in the radiatied emission exceeding the limit. The reason why the radiation emission exceeded limits, and the process of discovering is described in detail, combined with theory and practice. By updating relevant software, turn off the clock driver, the problem of exceeding the limit of radiation emissied is solved at a low cost.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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