COLLINEAR ANTENNA Russian patent published in 1998 - IPC

FIELD: antenna equipment for radio communication and broadcasting in meter and decimeter wave ranges. SUBSTANCE: collinear antenna has vertical network of two active shunt dipoles anchored uniaxially on bearing metal tube. Each shunt dipole is composed of two identical arms and elements similar in design playing role of metal insulators that section bearing metal tube and remove its influence on directing properties of antenna. Antenna includes distribution power supply system passing inside bearing metal tube which is manufactured in the form of coaxial feeder path formed by conductors arranged inside bearing metal tube and its internal surface. Lower end of first conductor is connected to main supply feeder and its upper end is connected to connection point of upper and lower sections of second conductor which pass correspondingly to lower and upper sections of third conductor. Lower and upper ends of third conductor are connected to supply points of active dipoles. Geometric dimensions of coaxial feeder path and structural elements of antenna are determined by following relations: distance between supply points of active dipoles is L₁, where L₀ is medium length of wave of working range of frequencies; distance between upper ends of adjacent arms of antenna is L₂; ratio of diameter d₁ of first conductor to inner diameter D₁ of bearing metal tube equals d₁/D₁= 0,21-0,23; ratio of diameter d₂ of second conductor to inner diameter D₁ of bearing metal tube equals d₂/D₁= 0,064-0,071; ratio of diameter d₃ of third conductor to inner diameter D₁ of bearing metal tube equals d₃/D₁= 0,13-0,14; ratio of diameter d₄ of fourth conductor to outer diameter D₂ of bearing metal tube equals d₄/D₂= 0.056-0.063; distance between internal wall of bearing metal tube and third conductor is h₁= (0,24-0,26)×1; distance between first and third conductors is h₂= (0,475-0,525)×1 and length of third conductor is l₃= (0,225-0,275)×l₀. EFFECT: improved operational characteristics. 2 dwg