Design and implementation of a new Butler matrix using slot line technology

In this paper, a 4 by 4 Butler matrix beam forming network for multibeam antennas was designed at 5.8 GHz. The structure is implemented using slot line technology. The use of the slot line technology is justified by the useless of air bridges as used in the conventional CPW one. Moreover, a new hybrid coupler and cross-over were designed and fabricated to test the feasibility of each element. To examine the performances of the proposed matrix, experimental measurements were carried out. To validate our approach, a comparison between measurements and simulations are given.