Efficient Directional Antenna Design Suitable for Ubiquitous Power Internet of Things

Abstract

Today’s power systems are developing from traditional multi-sensor systems to ubiquitous power Internet of Things systems. The environmental backscatter technology makes communication equipment get rid of the dependence on power supply, is more energy-efficient, and effectively extends the communication distance, which is very suitable for power Internet of Things scenarios. Tag antenna is an important part of environmental backscattering, but it has problems such as low reliability and insufficient reading distance in the traditional power Internet of Things. In view of the above problems, this paper designs a double-antenna structure tag antenna, which adopts omnidirectional receiving and directional transmitting methods to achieve the purpose of comprehensive signal coverage for the power Internet of Things application scenarios. It has the characteristics of obvious gain, small side lobe, and strong anti-interference.

On the design and analysis of a miniaturized ultra‐wideband (UWB) antenna using quatrefoil‐shaped nonuniform meta‐surfaces for body‐centric communications

“…Antennas with directional pattern are given in previous studies, 14,15 but due to the usage of multiple patches and stacked layers of substrates, the antenna's size turns out to be very large, which again makes it less usable for bodyworn applications. The antenna 16 deploys CPW method to achieve UWB and completely backed with a reflector for obtaining directional pattern in the entire UWB band.…”

Series arc fault detection method based on Wavelet energy spectrum entropy

“…When an arc fault occurs in a line, the load impedance is much larger than the circuit impedance, so the arc fault voltage basically acts on the load side voltage and distorts it [27]. With the development of intelligent distribution network technology, electrical equipment of distribution terminal gradually has the function of electrical detection, which provides a good application basis for load side voltage detection [28]. For this reason, this paper analyzes the fault characteristics of load side voltage of different types of loads, for solving the difficulty of extracting fault characteristics of different loads in different frequency bands, a method of fault detection based on wavelet energy spectrum entropy of the voltage on the load side is proposed.…”