By LEIDITECH | 14 March 2024 | 0 Comments
NB-IoTEquipment antenna electrostatic surge protection scheme
Narrowband Internet of Things（Narrow Band Internet of Things，NB-IoT）It is a way to provide low power consumption for IoT devices、Wide coverage and high reliability connectivitywireless communication technology。It isLTE（Long Term Evolution）A variant of the internet，Specially designed to support large-scale low-power consumption、Low speed IoT communication requirements。
NB-IoTThere are the following main characteristics
² low power consumption：NB-IoTAdopting optimized RF design and narrowband communication technology，Enable devices to operate at low power consumption for extended periods of time，And extend the battery life。
² Wide coverage：NB-IoTUtilizing existing resourcesLTEInfrastructure，Can achieve a wider coverage range，Including indoor and underground areas。
² high reliability：NB-IoTAdopting techniques such as retransmission mechanism and error verification，To ensure reliable data transmission，Can maintain connectivity even in poor signal environments。
² low cost：Due toNB-IoTUtilize existing resourcesLTEnetwork，No additional infrastructure investment required，Therefore, deployment and maintenance costs are relatively low。
² NB-IoTWidely used in the field of the Internet of Things，For example, smart cities、Smart Home、smart meter 、Environmental monitoring, etc。It provides reliable connections for various IoT devices，Making large-scale deployment and management of IoT applications easier and more cost-effective。
NB-IoTantennaElectrostatic surge（ESD/EOS)Necessity of protection
NB-IoTWide range of device applications，Or indoors or outdoors，The antenna of this device usually requires electrostatic surge protection，
Static electricity may accumulate between the device and antenna，Causing electrostatic discharge phenomenon，Potential damage to equipment。In outdoor environments，The weather conditions may be unstable，Natural disasters such as lightning strikes may cause electrical surges，Thus causing damage to equipment and systems。
therefore，Static surge protection components need to be placed at the antenna interface，Used to limit the propagation of overvoltage，Reduce the damage of electrical surges to equipment，In response to this situation, Shanghai Leimao has launched a protection plan。
Recommended protection plan for Shanghai Leimao
Advantages of the plan：Used to meetNB-IoTStatic surge protection of antenna interface，Ultra low capacitance，Can ensure signal integrity。
according toNB-IOT Module voltage selection 3.3VLow junction capacitancediodeULC3311CDN, Or 5V Low junction capacitanceESD二极管ULC0511CDN30 ，Contact discharge 30kV，Air discharge 30kV。If it is necessary to meetIEC61000-4-5 surge tests set up at the front endGDTdevice,SelectionSMD4532-090NFOr 2R090-5Setc.。
NB-IoTEquipment antenna static surge diagram：
ESD static electricity and surge protection devices used
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