一种低轮廓半模基片集成波导圆极化天线

Low-profile circularly polarized antenna using the half-mode circular substrate integrated waveguide technique

为减小基片集成波导圆极化天线面积,设计了一种低轮廓半模基片集成波导圆极化天线.通过顶面加载不等长交叉缝隙,天线获得左旋圆极化性能.此外,设计在中间层的加载枝节带状线馈电结构以及在地板的S形缝隙,使得天线获得更好的阻抗匹配.实测结果表明,此天线阻抗带宽为7.3%(S11≤-10dB),轴比带宽为1.6%(AR≤3dB),天线的最大增益为6.2dBi.

A technique to design a compact half mode substrate integrated circular cavity(HMSICC)cavity backed antenna is presented.The proposed antenna achieves left-handed circularly polarized(LHCP)using a crossed slot.The feeding strip-line loaded stub in the middle metallization layer and the S-shaped slot in the bottom metallization layer can achieve a better impedance match.Measured results show that the prototype achieves a bandwidth of 7.3%for 10 dB return loss and that the axial ratio(AR)bandwidth is at least 1.6%with the maximum gain of 6.2 dBi.