Design of remote control device using wireless sensor network and its use in intelligent monitoring of farmland information

The purpose is to control the growth state of crops remotely, design intelligent detection application of farmland information and improve the efficiency of agricultural information management. Wireless sensor technology is applied to remote control device. First, through the integration of the system functions that need to be completed in the farmland remote monitoring, the module requirements of the device are further determined. Finally, the overall design is determined. From the aspects of hardware, such as the selection of sensors, RF transceivers and software (such as data processing center module), remote control device is designed, and the detection and collection of farmland real-time information is completed. The results show that the communication distance of wireless sensor nodes can reach 215 m under the test condition of 0.5 m in open space. The research content can help people improve the understanding of crop growth environment and growth situation, and then help people improve work efficiency, and finally contribute to the process of agricultural informatization.

Simulation of a Nonlinear Frequency Multiplier using the FDTD Technique

Nonlinear circuits are a key component in RF transceivers. Efficiency and power requirements for 5G communication are creating new challenges in simulation and modeling of nonlinear devices. An application of the finite-difference time-domain (FDTD) method to nonlinear circuits comprising diodes is demonstrated. A frequency multiplier is constructed from a diode and a low-pass filter. The diode is simulated in the context of this circuit to demonstrate the formation of harmonics.