一种新型圆极化可重构天线

A New Circularly-Polarized Reconfigurable Antenna

本文利用最大功率传输效率法(MMPTE),通过4个相同左旋圆极化贴片单元作为子阵来实现阵列天线圆极化可重构。通过在被设计阵列(作为发射阵列)远场区引入极化控制接收天线,可以将整个收发系统看作一个无线功率传输系统,这样就可以把阵列天线的设计问题转换为一个天线之间的传输效率最优化的问题。通过调节接收天线的极化方式和接收位置,可控制被设计阵列的极化方式和扫描角度。与传统做法不同的是,被设计阵列单元的极化方式确定时,通过改变接收天线的极化方式,阵列还能产生与单元极化相反的极化方式,同时两种极化方式所得的增益差距在1 dBi以内。本文以中心频率在2.45 GHz的左旋圆极化单元组成的十六单元阵列为例,说明如何实现阵列左右旋极化的可重构以及+/-60°的扫描功能。

This paper applies the method of maximum power transmission efficiency(MMPTE)to the design of a circularly-polarized reconfigurable antenna array through the use of a subarray consisting of 4 identical left circularly polarized(LCP)patch elements.By introducing a polarization controlling receiving antenna in the far-field region of the array under design(as a transmitting antenna),the entire transmit-receive system can be regarded as a wireless power transmission system.Therefore the array design is converted into the optimization of power transmission efficiency between the two antennas.By adjusting the polarization and position of the receiving antenna,the polarization and scanning angle of the transmitting antenna array can be controlled accor-dingly.Unlike the traditional methods,once the polarization of the array element is fixed,the array can also produce a polarization mode that is opposite to that of the array element by changing the polarization of the receiving antenna,and the gain difference between the two polarization modes is within 1 dB.A 16-element LCP array working at 2.45 GHz is used as a design example to illustrate how to realize the reconfigurable left-or right-handed polarization of the array as well as the beam scan in the range of+/-60°.