DUPLEX NON-DIRECTIONAL UHF ANTENNA Russian patent published in 1999 - IPC

FIELD: antenna equipment. SUBSTANCE: device has two coaxial conic dipoles which vertices are directed to one another. Vertex of first conic dipole is connected to central wire of coaxial feeder. In addition device has second coaxial feeder. Goal of invention is achieved by short-circuiting of edges of bases of conic dipoles. Centers of by-passes are connected to round frame, which is located in plane which is parallel to planes of bases of conic dipoles. Said frame is designed as tube conductor with cuts. Ends of tube conductor on both sides of each cut are connected respectively to central wire and outer conductor of second coaxial feeder. Outer feeder of first coaxial feeder is connected to vertex of second conic dipole. Length of tube conductors between two adjacent cuts is not greater than 0,5λ_min,, radius of round frame conforms to condition 0,75λ_min≥r≥0,25_max,, where λ_min,λ_max are minimal and maximal bandwidth bounds. Height of conic dipole conforms to condition 0,15λ_max≤H≤λ_min, its vertex angle λ is within range of 60-90 degrees. EFFECT: improved isolation between channels.