Kubacki, R.; Przesmycki, R.; Laskowski, D. Shielding Effectiveness of Unmanned Aerial Vehicle Electronics with Graphene-Based Absorber. Electronics2023, 12, 3973.
Kubacki, R.; Przesmycki, R.; Laskowski, D. Shielding Effectiveness of Unmanned Aerial Vehicle Electronics with Graphene-Based Absorber. Electronics 2023, 12, 3973.
Kubacki, R.; Przesmycki, R.; Laskowski, D. Shielding Effectiveness of Unmanned Aerial Vehicle Electronics with Graphene-Based Absorber. Electronics2023, 12, 3973.
Kubacki, R.; Przesmycki, R.; Laskowski, D. Shielding Effectiveness of Unmanned Aerial Vehicle Electronics with Graphene-Based Absorber. Electronics 2023, 12, 3973.
Abstract
In the work the enhanced security of unmanned aerial vehicles (UAVs) electronics in RF environment was investigated. UAVs are commonly used in many areas and the cellular networks as the parallel helping networks for systems: LTE, 5G or especially for future 6G are very perspective and needed. For effective communications in channels: “air-to-ground” as well as “drone-to-drone” the important task is undisturbed work of transportation platforms, ie. UAV. However, high level of outside electromagnetic radiation can affect the correct electronics work. The problem is due to non-conformity of RF environment regulations. The electromagnetic compatibility (EMC) standards guarantee correct electronics work when the radiation level is not higher than established EMC levels. In case of commercially available devices, like UAVs, this level is 3 V/m. On the other hand, permissive exposure level, treated as RF environment emitted by cellular base stations, can reach the level of 61 V/m. Such level of electromagnetic wave pollution, can damage unprotected electronics with fatal consequences. This can cause the unchecked drone flight or unchecked fall down. As a result, due to unchecked flight, the UAV can cause the sudden communication interruption with operator or other drones. To reduce the level of damaging RF field we propose to cover the UAV housing with microwave absorber. In this case absorber must ensure good electromagnetic protection as well as lightweight and resistant on weather conditions. The shielding property of reduced graphene oxide (RGO) as an absorber was investigated. For proposed material the shielding effectiveness (SE) was investigated in the frequency range from 100 MHz to 10 GHz. It has been proved that such material can be a good candidate as an absorber for UAV having low reflection coefficient and high absorption ability. In this work the shielding effectiveness of RGO was analyzed for two layers of 3 and 5 mm at typical frequencies as RF environment, ie. 3.6 GHz (5G system) and 5.8 GHz (LTE). Investigated absorber guarantees the value of SE of 25 dB and 30 dB for 3 mm layer at 3.6 GHz and 5.8 GHz respectively and of 29 dB and 39.5 dB for 5 mm layer at these frequencies respectively.
Copyright:
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