-In this work we propose the utilization of the Butler matrix as a six-port I/Q demodulator. The inherent symmetry of its topology allows to overcome the intrinsic amplitude and phase imbalances of the traditional approaches making it more suitable for the design of high performance six-port networks. To demonstrate the validity of the proposal a Butler matrix has been designed covering the complete UWB band and its results are compared with the traditional approaches.Index Terms -ultra-wideband (UWB), six-port I/Q demodulator, six-port receiver, Butler matrix, phase shifter, quadrature hybrid, power divider, slot-coupled lines.