COLLINEAR ANTENNA ASSEMBLY OF BICOAXIAL HALF-WAVE DIPOLES Russian patent published in 2000 - IPC

FIELD: antenna engineering; radiophone communications. SUBSTANCE: antenna assembly has supporting pipe that mounts n antennas in the form of bicoaxial half-wave dipoles whose upper side is made of two coaxial cylinders and lower one, of one cylinder 1. Length of first cylinder 2 equals quarter the mean wavelength and is connected on top to supporting metal pipe. Second cylinder of upper side has same length and is connected to bottom part of first internal cylinder. Inner surface of first cylinder and outer surface of supporting pipe form metal insulator. Outer surface of first cylinder and inner one of second cylinder form metal insulator that prevents current flow over outer surface of supporting pipe. Antenna assembly provides for keeping traveling-wave ratio between maximum 1.4-1.5, eliminating multilobe directivity pattern in vertical plane at maximum 1 dB variation of directivity pattern in horizontal plane, and reducing dipole-to- dipole coupling coefficient to 27-28 dB. EFFECT: reduced traveling-wave ratio and dipole-to-dipole coupling coefficient. 2 dwg