Patent ID: 9645222
Date: 2017-05-09
CPC Classifications: G01S

Claim:
1. A direction finding antenna system, comprising: a plurality of antenna elements disposed in a circular array, wherein each antenna element has equal angular spacing about the circular array and is equidistance from the center of the array and receives a wireless signal originating from a mobile wireless device; a plurality of signal splitters, one for each antenna element, wherein each said splitter splits an output signal from its respective antenna into two identical split signals; a plurality of branch line couplers, wherein each branch line coupler receives first and second split signals from an adjacent pair of said antenna elements and generates a sum of said split signals and a difference of said split signals for said adjacent pair of said antenna elements, respectively; signal samplers adapted to sample the output of said branch line couplers and generate a signal strength indication; and a processor adapted to utilize the signal strength indication from said signal samplers to: