Patent ID: 10923826

Abstract:
A double helical coil antenna includes a low frequency helical coil configured to operate in axial mode emitting a beam of radio waves with circular polarization in a preselected direction, wherein one end of the low frequency helical coil terminating on a ground plate. It further includes a higher frequency helical coil configured to operate in axial mode emitting a beam of radio waves with circular polarization in a preselected direction, wherein the higher frequency helical coil concentrically mounted within the low frequency helical coil and with one end terminating onto the same ground plate, wherein the higher frequency helical coil selected to have opposite polarization to the low frequency coil. Preferably the antenna further includes a beam reflector cup mounted onto the ground plate having a cup bottom and a cup wall wherein the diameter is dimensioned to fit in between the low frequency helical coil and the higher frequency helical coil thereby increasing the gain of the higher frequency helical coil.