Patent ID: 8659483

Claim:
A planar antenna, comprising: a dielectric layer; and a first conductive layer mechanically coupled to the dielectric layer, the first conductive layer comprising: a first arm having a shape defined by a first outer border comprising a first conic section and a first inner border comprising a second conic section; a feed line coupled to the first arm at a feedpoint location at or near a central axis of the first arm; and a second arm offset from the first arm along the central axis of the first arm, the second arm defined by a shape at least in part mirroring a shape of the first arm; and wherein at least a portion of the feed line bifurcates the second arm into at least two portions; wherein the at least two portions of the second arm are conductively coupled to a return conductor; wherein the first and second arms comprise respective conductive strips including a lateral width that varies along the central axis; wherein the respective conductive strips include a lateral width tapering from a wider width near the feedpoint location to a narrower width away from the feedpoint location; and wherein the respective conductive strips include a lateral width that widens again at respective distal tips of the conductive strips away from the feedpoint location.