Figure 2. Electric field distribution of 2-D Bessel beams generated by the lens at different frequencies.
(a) 12 GHz; (b) 15 GHz; (c) 18 GHz. (dimension unit: m).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.