Minimum Loss, Compact, Fabrication Oriented Design Of 8 Inputs By 8 Outputs Wave Guide Butler Matrix
Jacob Remez, Roi Carmon
Technion, Institute of Technology, Electrical Engineering, Communication Laboratory, Haifa, Israel
1st January 0001
Butler matrix, multibeam antenna, waveguide network, high power microwave, top wall hybrid, side wall hybrid, differential phase shifter, waveguide components
The Butler matrix is a beam forming matrix that is useful for multibeam array antennas. This matrix has the advantage that theoretically all the input power arrives to the radiating array. If it is built in waveguide technology the network is almost lossless, but a small loss still remain due to the finite conductivity of the metal.
Special structure architecture can reduce matrix dimension and loss by shortening the signal path and avoiding unnecessary connecting waveguide sections or crossing components. In this paper we report a structure that uses known waveguide components such as the short slot and top wall hybrids, and stub loaded differential phase shifters, to form a Butler matrix with compact dimensions and minimum loss. The network shape yields the shortest path length from the inputs to the outputs, thus minimizing the loss. The idea is more beneficial for larger matrices like 16 by 16. Realization and assembly considerations for the matrix are also being discussed.
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