ULTRA-WIDEBAND HELICAL ANTENNA Russian patent published in 2011 - IPC H01Q9/00 

FIELD: physics.

SUBSTANCE: antenna is in form of a combined two-start spiral, consisting of a flat spiral placed on a dielectric plate and a hemispherical spiral which is galvanically coupled with the flat component mounted on a dielectric housing which repeats is shape. The antenna has a matching balance-to-unbalance transformer and metallic reflectors. Inside the housing on the metallic reflectors of the flat and hemispherical spirals there are rings made from absorbent material, wherein the outer diameter of the lower ring is equal to the diameter of the dielectric housing. On the back side of the metallic reflector of the flat spiral there is an absorbing ring whose working surface faces the metallic reflector of the hemispherical spiral.

EFFECT: wider working range in the low frequency range without increasing size of the antenna.

1 dwg