Papers by Keyword: Wireless Node

Abstract: For the problems of the environment, it is important to monitor and manage the environment. The system of environment monitoring based on the Internet of Things (IoT) technology is proposed, which meets the need of the practical application. The central discussion is about the application of the self-organization mechanisms of networks and the wireless location technology. The system is composing of network nodes including the sensors, the wireless acquisition, the wireless coordinator and the information managing software. The self-facture nodes implement the standard of the zigbee settlement for its strongpoint of the low power consumption and the low cost. The results show that the system of environment monitoring has good performance such as the real-time data collection, the wireless transmission and the intelligent monitoring, so the system is feasible to the practical application.

Abstract: Return loss of wireless sensor network (WSN) node indicates the impedance matching between signal ports of the RF chip and the antenna, and thus shows the transmission efficiency in the signal path. All circuit components, including capacitors, inductors, PCB tracks, packaging parasitic and RF ports were modeled as equivalent passives, to achieve accurate simulation result of return loss of the WSN node. An optimization methodology of return loss was proposed based on the parameter sweep of the equivalent passive network simulation. With the help of the methodology, some critical components’ values were changed to obtain optimized RF performance for the wireless node. Measurements matched the analysis and simulation well and showed great improvement.