Patent ID: 9118116
Filing Date: 2015-08-25
Classification: H01Q

Abstract:
1. An antenna apparatus comprising: four quadrant elements, each quadrant element comprising a conductive cylinder side section, a conductive cylinder top section, and a feed point; a first pair of the four quadrant elements positioned opposite to one another along a major axis; a second pair of the four quadrant elements positioned opposite to one another along the major axis; one or more capacitive elements interconnecting the conductive side section and the conductive top section of one or more of the quadrant elements; a phasing module for selectively combining the feed points provided by respective quadrant elements; an omnidirectional metallic radiator disposed adjacent the primary axis; wherein the omnidirectional metallic radiator is a hollow metallic cylinder, and wherein one or more feed lines coupled to corresponding feed points are fed through the hollow metallic cylinder.