Hongfu Meng, Bo Xiang, Jinglei Zhang, Wenbin Dou, Yanzhong Yu
http://link.springer.com/article/10.1007%2Fs10762-013-0037-9#
In this paper, the zero-order Bessel beam at W band is generated by using a diagonal horn, a convex lens, and an axicon. The generated Bessel beam has a beam spot size of 5.5mm and can propagate with a distance longer than 100mm. Several imaging experiments with the generated zero-order Bessel beam are done. The results show that the millimeter wave imaging system with the generated Bessel beam can be used to detect object as small as 1mm.
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