SPIRAL-DIPOLE SYMMETRIC ANTENNA "RAVEL-C" Russian patent published in 2008 - IPC H01Q11/08 

FIELD: antenna engineering.

SUBSTANCE: spiral-dipole symmetric antenna consists of two spiral dipoles, combined with symmetric matching elements designed as spiral matching bend and feeder looking like cable with braided screen. All antenna spirals look like return loop, antenna feeder is connected to dipoles by means of straight portion and forms spiral in area located lower than horizontal plane going through cable input point. Spiral is plane-shaped with odd number of bends. Central cable core after specified bends is connected to second spiral dipole as isolated conductor. Spiral of conductor within area located above horizontal area going through cable input point is designed as plane-shaped with odd number of bends. Adjacent bend portions are shifted to odd number of rotation. After conductor returns to feeder input area wire forms third plane spiral by means of cable winding to spiral located lower than horizontal plane. Free output portion of conductor is electrically connected to braided screen.

EFFECT: antenna full internal matching, input resistance stability, emitter symmetry, as well as removal of all-band antenna resonance and reduction of influence of surrounding objects.

2 dwg