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To investigate the effect of automotive millimeter-wave radar radome matenvls on millimeter-wave transmittance performance, this paper inelaborates the intrinsic relationship between material transmission loss and electromagnetic parameters, and tests the electromagnetic parameters and transmission loss of several commonly used radar cover plastics, as well as the transmission loss of different Polypropylene (PP) material thicknesses. The results indicate that low polarity materials generally have lower dielectric constants and dielectric losses. The transmission loss of millimeter waves in bumpers exhibits a periodic relationship with wall thickness, and the transmission loss is minimal when the thickness is an integer multiple of half a wavelength. Furthermore, through analysis of the transmission loss of materials with different paint coatings and metal coatings, it is found that aluminum powder and pearlescent powder in paint components have a significant negative impact on the transmission performance of millimeter waves. Physical Vapor Deposition (PVD) aluminum plating is not suitable for Adaptive Cruise Control(ACC) vehicle logos, while appropriate film thickness PVD indium plating has minimal interference with millimeter waves and meets the transmission requirements.
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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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