一种新型互补结构的宽带圆极化印刷天线

A New Type of Complementary Structure of Broadband Circularly Polarized Printed Antenna

设计了一种新型的宽带圆极化微带天线,天线由两个完全相同的矩形微带贴片组成,采用微带线馈电方式为天线的上层微带贴片进行不对称馈电,下层贴片作为天线的部分地。天线从整体上是一个互补结构,根据圆极化产生的原理,在与馈电微带线相垂直的地方,开一条缝隙,产生正交的表面电流,调节天线的主要参数,使产生等幅正交的空间电场分量,从而产生圆极化波。通过增加十字形调谐结构,调节天线高频段的阻抗带宽和轴比带宽。天线在中心频率2.55 GHz处阻抗带宽(S11<-10 dB)为151%(0.8 GHz^4.5 GHz),天线的轴比带宽(AR<3 dB)为82.3%(1.5 GHz^3.6 GHz)。

A new broadband circularly polarized microstrip antenna is designed in this paper, it is from the traditional printed monopole geometry. Microstrip patch antenna consists of two identical rectangular , microstrip line asymmetric feeding for the upper microstrip patch and the lower patch as the part ground of the antenna. Antenna from a whole is a complementary structure, adjusting the main parameters of the antenna according to the principle of circular polarization generated, to open a gap perpendicular with the microstrip feeding line, orthogonal surface currents generated, so that the generated cross amplitude space electric field, to produce circularly polarized wave. By increasing the‘ ＋＇ type tuning structures, to adjust the bandwidth of the antenna height impedance and axial ratio band. The measured results show a -10 dB return loss bandwidth of 800 MHz to 4.5 GHz and a 3 dB axial ratio bandwidth of 1.5 GHz to 3.6 GHz. For the designed center frequency of 2.55 GHz, these correspond to 151 % and 82.3% respectively.