宽波束圆极化微带天线设计

Design of A Wide-Beam Circular Polarized Micro-strip Antenna

为了提高天线导航信号的有效覆盖面积,研究了应用于全球卫星定位系统(GPS)的宽波束圆极化微带天线。采用四个半径不同的非对称扇形切角实现天线辐射方向图的宽波束特性,天线的整体尺寸为0.395λ0×0.395λ0×0.016λ0(λ0为天线中心频率1.575GHz对应的工作波长)。应用商用仿真软件HFSS对天线进行了仿真设计,结果表明,该天线的圆极化带宽为13MHz(1.566~1.579GHz),阻抗带宽为78MHz(1.556~1.634GHz),增益大于5.9dBic,天线在中心频率1.575GHz时方向图的3dB轴比波束宽度为165°。在仿真设计的基础上,制作天线的工程样机,样机测试结果与设计结果吻合良好,说明了设计方法的有效性。

A wide-beam circularpolarized（CP）micro-strip antenna for global navigation satellite systems（GPS）is proposed in this paper.Four fan-shaped notches with different sizes of a square micro-strip radiator are suggested for CP radiation with widebeam.The antenna is 0.395λ0×0.395λ0×0.016λ0（λ0 is the working wavelength corresponding to the antenna center frequency of 1.575 GHz）in size.The standard simulation software HFSS is used to simulate the antenna design.The simulation results show that：the simulated 3-dB axial ratio（AR）bandwidth of the proposed antenna is 13 MHz（1.566-1.579 GHz）and a10-dB return loss bandwidth is 78 MHz（1.556-1.634 GHz）with a gain of more than 5.9 dBic.A 3-dB AR beam-width of 165°is obtained at the central frequency of 1.575 GHz.The proposed antenna prototype is fabricated and measured,and experimental results support the simulation analyses.This illustrates the effectiveness of the designed method.