US Patent 7724189 Broadband binary phased antenna

A broadband binary phased antenna includes an array of symmetric antenna elements, each being connected to a respective symmetric switch. The symmetric antenna elements are each symmetrical about a mirror axis of the antenna element and include feed points on either side of the mirror axis capable of creating opposite symmetric field distributions across the symmetric antenna element. The opposite symmetric field distributions are binary phase-shifted with respect to one another. The symmetric switch is connected to the feed points to selectively switch between the opposite symmetric field distributions.