Error Vector Magnitude Measurement On Cascaded Butler Matrices System

This paper describes error vector magnitude (EVM) measurement on vehicle communication system that employs low noise amplifiers (LNAs) and cascading Butler Matrices in producing broad beam high linearity and high gain narrow beam system. The output signals from the first Butler Matrix that have high gain and narrow beam width can be used for long distance communication while the outputs from the second Butler Matrix, which have high linearity, and broad beam width can be used for short range communications.