This study presents radio waves capable of long-distance propagation in the 100GHz band.The millieter wave band was difficult to put into practical use due to the problem of short propagation distance.As a solution,our research focuses on diffraction free beam in optical engineering and a system that generates diffraction free wbeam in the 100GHz band is considered.In this report,we design a waveguide as a primary radiator,an absorber slit to generate annular electric field distribution and thin lens at the 100GHz band,and report on the possibility of diffraction free wave generation.
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