Abstract: A new design of butler matrix network, deployed in wideband multi-mode in phase linear circular array for DF, and the implementation of its circuits are described in this paper. The new design of mono-directional matrix expansion proposed in this paper based on engineering efforts makes the procedures of matrix expansion more simple, due to the number and types of differential phase shifter needed in the new one and the amount of phase shift are sharply reduced than that in the traditional ones, resulting in a high amplitude-phase accuracy and lower inserting loss. Some good solutions to improve the performances of microwave components such as 90°hybrid with coupled strip line, power divider, differential phase shifters in full network configuration are also presented in this paper. Finally, the technical details that should be mentioned during the time to debug the circuits of Butler　matrix is also given.