These wide band Couplers allow operation across the range 800 MHz to 3500 MHz making them particularly suitable for use in the distribution of multiple mobile operating signals in buildings and tunnels. Directional coupler can be used to detect the transmitted power and frequency spectrum of transmitters ,in power control and demodulation also. These are widely used for CDMA/GSM/DCS/WIMAX in indoor coverage systems and optimize the power distribution according to the requirements.