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A Numerical Study of Coaxial Helical Antennas

机译:同轴螺旋天线的数值研究

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摘要

A FEKO model was constructed to investigate two helical antennas integrated coaxially on a shaped ground plane. One antenna was designed to have a reasonable gain and axial ratio (AR) from 0.5 - 0.9 GHz and the other from 1.0 - 1.6 GHz. In principle, the antennas could be connected in parallel to provide a near 50 Ω input impedance and act as a wideband antenna. However, this connection is problematic and can make fabrication more complex while changing the input impedance in unpredictable ways. An alternative is to use a microstrip impedance transformer to provide a 50 Ω input to each antenna. Then a broadband splitter can be used for a single feed wideband antenna. Otherwise, these two ports with switched input allow dual-band operation. The FEKO model is described and simulation results are presented for both cases. These results encourage further virtual prototyping and prototype fabrication for model validation.
机译:构建了一个FEKO模型,以研究同轴地集成在成形接地平面上的两个螺旋形天线。一种天线被设计为在0.5-0.9 GHz范围内具有合理的增益和轴比(AR),另一种在1.0-1.6 GHz范围内具有。原则上,天线可以并联连接以提供接近50Ω的输入阻抗,并充当宽带天线。然而,这种连接是有问题的,并且在以不可预测的方式改变输入阻抗的同时会使制造变得更加复杂。另一种选择是使用微带阻抗变压器为每个天线提供50Ω输入。然后,宽带分离器可用于单馈宽带天线。否则,这两个具有切换输入的端口允许双频操作。描述了两种情况下的FEKO模型并提供了仿真结果。这些结果鼓励进一步的虚拟原型设计和原型制造,以进行模型验证。

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