Patent ID: 6867747
Filing Date: 2005-03-15
Classification: H01Q

Abstract:
1. A directional antenna configured to broadcast a signal from an input line having a core and shielding, comprising: a) a conductive base plate, operatively interconnected to the shielding of the input line; b) a substantially solid, cylindrical dielectric rod, mounted on the base plate; c) a single, unidirectional conductive helix, wrapped around an outer surface of the dielectric rod, having a pitch angle of at least 12 degrees; and d) a strip line matching network, attached between the core of the input line and the conductive helix, which tapers from a maximum width at a connection point on the input line to a minimum width at a connection point with the conductive helix, wherein the matching network is configured to match an impedance of the conductive helix with an impedance of the input line.