Title :
Design of wideband Butler matrices using Schiffman lines
Author :
Foti, S.J. ; MacNamara, T.
Author_Institution :
ERA Technol. Ltd., Leatherhead, UK
Abstract :
Practical design considerations are presented for the realisation of wideband Butler matrices in stripline. The discussion concentrates on the design of the wideband frequency invariant phase shift and hybrid networks required within the Butler matrix. A design example using single section Schiffman lines and three-branch branch line couplers augmented by Schiffman lines is described which operates over a 26% bandwidth. This approach is suitable for bandwidths up to an octave. For multiple octave operation, approaches using tandem couplers and multi-section Schiffman lines are discussed
Keywords :
antenna feeders; phase shifters; transmission lines; Schiffman lines; antenna feeders; bandwidth; branch line couplers; design; frequency invariant hybrid networks; frequency invariant phase shift networks; multiple octave operation; tandem couplers; wideband Butler matrices;
Conference_Titel :
Multiple Beam Antennas and Beamformers, IEE Colloquium on
Conference_Location :
London
