Butler matrix

Butler matrix

An electronic phasing device by which the signals from 2n separate elements of an array are combined with their correct relative phases to produce 2n outputs, each of which corresponds to a main lobe (see antenna) pointing in a different direction.
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Printed circuit switched-beam smart antenna system using 4x4 Butler matrix beamforming network at the band (11.
The Butler matrix is a corporate multiple beam feed, whereas Blass and Nolen matrices exploit the series feed method.
Rahimian, "Enhanced RF steerable beam-forming networks based on Butler matrix and Rotman lens for ITS applications," IEEE Region 8 Int.
In [22], the optimum design for 4 x 4 planar Butler matrix array antenna was given for 5 GHz WLAN only.
It consists of a Butler matrix and a frequency-agile antenna array.
The multi-beam antenna design used by both Motorola and TRW use a two-dimensional Butler matrix beam-forming network to produce a pincushion footprint display within each coverage area.
Multiple beam arrays generally use beamforming networks, such as the Butler matrix or Rotman-Gent lens, to allow the aperture to transmit or receive power in several directions.
In this work, a Butler matrix with four inputs and four outputs has been designed.
The Butler matrix is a well-known implementation of such an orthogonal BFN [13].
The Butler matrix is a beam-forming network of lossless property and able to form orthogonal beams, which is useful for the synthesis of a complex antenna's radiation pattern.
This is in contrast to analog multiple-beam-formers, such as the Butler matrix or Rotman lens, where the output beams must be orthogonal to avoid loss of signal power.
6,7] Lens antennas generally fall into two categories: Butler matrix fed arrays[5,1] and Rotman lens fed antennas.