PROBLEM TO BE SOLVED: To eliminate the need of a balun for antenna characteristic degradation prevention by connecting a reflection element disposed separately from a radiation element for the specified wavelength of a using center frequency wavelength to an outer conductor at the position of the specified wavelength from the power feeding point of a coaxial cable for feeding power to the radiation element and turning the reflection element to the stab of leakage current obstruction. ;SOLUTION: A distance between both elements and between the power feeding point of the radiation element and the connection point of the reflection element is turned to a 1/4 wavelength. When the core wire and the outer conductor of a coaxial power feeder 3 are respectively connected to the radiation elements 1-R and 1-L respectively bisected to the 1/4 length of the wavelength λ of a using center frequency, the standing wave current of a minimum value is made to flow at both ends of the radiation element 1. By connecting the bisected reflection elements 2 of a λ/2 length each to the outer conductor of the coaxial power feeding body 3 at a part separated for λ/4 from the radiation element 1, after the reflection element 2 of the coaxial power feeding body 3, a leakage current flowing to the outer conductor is obstructed. It is sufficient to provide only the radiation element and the reflection element, and when a waveguide element is provided on the front part of the radiation element 1, an antenna beam is sharpened.;COPYRIGHT: (C)1998,JPO
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