RADIO BASE STATION ANTENNA

摘要

PROBLEM TO BE SOLVED: To obtain an antenna having a directivity in an optional direction with a simple structure by providing a metallic plate placed between a 1st and a 2nd radiation element group and a phase shift correct adjusting an input output relative phase of the 1st and 2nd radiation element groups. SOLUTION: Feeding phasesψ1n andψ2n of an n-th radiation element generated by each feeding distribution circuit of a 1st dipole array 1-1 and a 2nd dipole array 1-2 are set to be gwien respectively byψ1n =-ψ0 (n-1) andψ2n =ψ0 (n-1), whereψ0 is the delay phase difference between adjacent elements. The 1st and 2nd dipole arrays 1-1, 1-2 are placed on both sides of a metallic plate 1-3 with a narrow width and connected to a phase shift circuit 1-6 to adjust the relative phase of input and output of each dipole array. Let a relative delay phase difference of the 1st dipole array 1-1 with respect to the 2nd dipole array 1-2 beα, then a desired radiation directivity is obtained by selecting the relative delay phase differenceαto be an optimum value.