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本文给出一种能同时工作在两种圆极化状态的双端口圆极化微带天线。它的圆极化带宽由通常的0.35％增加到5％。由于双端口负载中的损耗,上述带宽的改进导致天线增益下降了约3dB。对这两者加以适当的折衷,可使这种类型的天线增添新的应用,如可以以双圆极化状态同时用作发射和接收。在轴比为2dB时,交叉极化干扰为-19dB;轴比为3dB时,这种干扰是-14dB。此外,文中还讨论了改进天线端口间隔离度的方法。
This paper presents a dual-port circularly polarized microstrip antenna that can work in two circular polarizations at the same time. Its circularly polarized bandwidth increases from the usual 0.35% to 5%. Due to the loss in the dual-port load, the above improvement in bandwidth leads to a drop of about 3 dB in antenna gain. Appropriate trade-offs between these two can add new applications to this type of antenna, such as transmitting and receiving simultaneously in a dual circular polarization state. When the axial ratio is 2dB, the cross-polarization interference is -19dB; when the axial ratio is 3dB, the interference is -14dB. In addition, the paper also discusses ways to improve the isolation between the antenna ports.