| 摘要 |
PROBLEM TO BE SOLVED: To make miniaturization and a high gain by setting the electric interval of metal wire installed on a side face of a circular dielectric having a dielectric constant having a prescribed distribution to a specific ratio of operation wavelength, turning respective ports to be connected to a changeover switch on or off to connect them to an antenna feeder line. SOLUTION: The radius of a circular cross section of a cylindrical dielectric is defined as R, a distance directing from a corresponding part to the center is defined as (r), and the dielectric constant Er of the cylindrical dielectric is defined as Er=2-(r/R)2. The electric interval of each metal wire An and Bn is made about 1/4 of operation wavelength, and when optional metal wire Bm (1<=m<n) is excited, a changeover switch turns on ports (n+m) to which a metal line Bm is connected according to the short circuit or release relation of a metal line A with a disk metallic plate in an antenna feeding line, turns off the other ports, a port (m) to which a metal line Am is connected and turns off the other ports to perform convergence of radiation beams of a dielectric lens 1.
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