Method for preparing terahertz lens antenna group

Abstract

The present invention provides a method for preparing a terahertz lens antenna group. The method comprises: step 1) calculating an unknown external index of the lens antenna group; and step 2) placingthe imaging target point on the object plane of a lens, and obtaining an optimized lens antenna by using the size of the light spot of the image plane of a quadric surface single lens; step 3) continuing to increase the number of quadric single lenses, and continuing to optimize the added quadric surface single lens, to obtain the optimized lens antenna group; step 4) for the lens antenna group obtained in the step 3), performing the tolerance analysis on the lens antenna group by adopting the Monte Carlo method, if the diameter of the light spot at the edge of the image plane is 10 times orlarger than the diameter of the light spot at the center point of the image plane, and the beam uniformity is greater than 3dB, repeating the steps 1) to 3); and step 5) placing the known feed antennaon the image plane by using the electromagnetic simulation software FEKO, to determine whether the diameter of the light spot focused on the object plane and multi-beam gain difference meet the requirement of the regulations.

Description

technical field [0001] The invention relates to the technical field of terahertz wave imaging antennas, in particular to a method for preparing a terahertz lens antenna group. Background technique [0002] The principle of terahertz passive imaging is similar to the principle of optical imaging. Due to the different working frequency bands, there must be differences in hardware design. This difference is mainly manifested in the form of the receiving part of the imaging system. The research of optical imaging has a history of more than 100 years, and the technology of this part has been mature and widely used in practice. However, the penetration of visible light and near-infrared systems is not good. In bad weather, dust, and dark days, the imaging effect is significantly worse. When the imaging object has thick packaging, visible light and even near-infrared light waves are difficult to penetrate. Therefore, the terahertz wave whose frequency is significantly lower than t...

AI Technical Summary

Problems solved by technology

[0004] At present, the traditional preparation method of terahertz lens antenna adopts the preparation method of millimeter-wave lens antenna, such as the equal optical path method, but due to the equal optical path method, the optical path of the vertical incident beam and the edge incident beam can only be equal to obtain the optical path of the lens antenna. The expression, the lens antenna obtained by this preparation method has poor imaging effect when used in imaging systems, and is not suitable for large field of view

In order to achieve the uniformity of multi-beam gain, the traditional design method will use iterative algorithm, the accuracy of this method is significantly higher than the former, the designed lens antenna often uses a single lens with free-form surface, but the processing accuracy of the single-lens with free-form surface is quite demanding. High, difficult to meet the requirements, resulting in increased costs

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