US Patent 7518554 Antenna arrays and methods of making the same

An omni direction antenna comprising a substrate having a first side and a second side with a first conductor coupled to the first side of the substrate and a second conductor coupled to the second side of the substrate is provided. The first and second conductors comprise wide elements substantially aligned over narrow elements. The antenna further has a terminating element shorting the first and second conductors. A feed element is coupled to the first side wide element, the feed element comprising at least one transmission line, at least one impedance matching element, and at least one ground plane substantially aligned with the at least one transmission line.