FEEDING MECHANISM FOR HORIZONTAL-PLANE OMNIDIRECTIONAL ANTENNA

PROBLEM TO BE SOLVED: To provide a feeding mechanism for a horizontal omnidirectional antenna for relaxing the assembling accuracy. SOLUTION: The horizontal omnidirectional antenna 10 is provided with: an antenna feeding section 12 including parallel conductor plates 22a, 22b providing radiation horizontal omnidirectivity; a coaxial part 14 including an external conductor 24 and an insulator 26; and a coaxial waveguide conversion section 16 including a waveguide 28. Then one conductor 20 is penetrated through a center of the insulator 26 with a length of L2to act like a coaxial center conductor 32, projected from the conductor plate 22a in the feeding section 12 to act like a feeding probe 30, and projected into the waveguide 28 in the coaxial waveguide conversion section 16 to act like a conversion probe 34. Even when the fitting position of the conductor 20 is in dispersion, since the sum of the length of the feeding probe 30 and the length of the conversion probe 34 is unchanged, a change in the frequency characteristic of the feeding probe 30 is mutually cancelled with a change in the frequency characteristic of the conversion probe 34. COPYRIGHT: (C)2006,JPO&NCIPI