基于谐振式无线电能传输系统中螺旋天线物理实现的约束条件及设计

Design of Spiral Antenna of Wireless Transmission System Based on Magnetic Resonance and Its Constraint Conditions of Physical Implementation

在磁耦合谐振的无线电能传输系统中,螺旋天线将射频能量进行发射与接收。讨论螺旋天线的几何参数与其谐振频率的关系,提出螺旋天线制作的约束条件。据此制作出两个相同的螺旋天线,用于磁耦合谐振的无线电能传输系统中的发射天线和接收天线,并在系统中进行测试。实测结果表明该组发射天线和接收天线在8 MHz谐振频率下,螺旋天线间的距离为1 m时的传输效率达77%。

In wireless power transmission system with coupled magnetic resonances, RF energy can be transmitted and received by spiral antennas. The relationship between the geometric parameters of a spiral antenna and its resonant frequency is discussed. Some constraint conditions for making the spiral antenna are proposed. On this basis, two same spiral antennas, which are used to be the transmitting antenna and receiving antenna in the wireless power transmission system using coupled magnetic resonances, are made and tested in the system. The results show that the transmission efficiency between the antennas at one meter is up to 77% at the resonance frequency of 8 MHz.