一种双馈圆极化微带天线的设计

Design of a Circular Polarization Microstrip Antenna with Dual-feed

设计了一种具有移相功分网络的双馈圆极化微带天线,辐射采用矩形微带贴片,移相功分网络采用带状线。通过构造两个方向正交、幅度相等、相位差为90°的两个电场分量,从而实现天线的圆极化性能。天线工作在S波段,具有超过40%的阻抗匹配带宽(VSWR≤2)和20%的圆极化带宽(AR≤3dB),天线增益在±60°内大于-1dB的带宽达到12%。最终将四个天线进行组阵工作,利用四通道对天线进行比相,达到二维测向的功能。

Abstract： The circular polarization dual-feed antenna with phase shift and power divider network is designed in this paper. The antenna is a microstrip rectangular radiator, and the phase shift and power-divider network is designed base on the technology of stripline. By building up two electric components with perpendicular directions, equal magnitude, and with 90°phase shift, the antenna get the assignment of circular polarized. The antenna reso- nates in the S-band, having more than 40% resonant bandwidth （VSWR〈2） and 20G circu lar polarized bandwidth at least （AR〈3 dB）. Beside these, there is 12% bandwidth with gain between -60°to 60°is more the-1 dB. At last, the array with four antennas works to- gether as a system which obtains the direction of target by measuring the phase of the differ- ent antennas.