Theory and simulation of 3 mm conical horn focusing lens antennas
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摘要: 介绍了基于传统光路法的聚焦透镜的设计方法。利用电磁仿真软件计算了透镜置于圆锥喇叭口的3 mm聚焦透镜天线的性能。根据圆锥喇叭最大方向系数及现有文献公式确定喇叭张角，仿真得到天线聚焦性能不够理想。然后仿真了张角12,20,30三种天线聚焦性能，其焦距随张角增大而增大，逐渐接近所设计焦距。从而验证了光路法需电磁波长相对喇叭口径足够小的结论。给出了喇叭张角12,20,30三种天线焦平面上电场分布。喇叭张角30天线焦斑小于2倍波长。Abstract: The design of focusing lens based on traditional ray path method is introduced. The performances of 3 mm focusing lens antennas are simulated by using electromagnetic simulation software. Antennas with different spread angles (12,20,30) of horn are simulated. Its concluded that the actual focal length increases and approaches to the value designed gradually when the spread angle of horn increases, and the ray path method can be applied when the electromagnetic wavelength is short enough compared with the horn aperture. The E-field on the focal planes of the three antennas is presented and the focal spot of the antenna with 30 spread angle is smaller than twice the electromagnetic wavelength.
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Key words:
- conical horn /
- ray path method /
- focusing lens /
- focal length /
- focal spot
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