Reflective Butler matrices
Abstract
A conventional Butler matrix can be modified to achieve a network which is symmetric about an axis midway between the input and output lines. Such a Butler matrix network can be further modified so that the input and output ports are identical. In this manner the halfmatrix appropriately terminated in the plane of symmetry corresponds to a reflectiontype system in which the feed positions are in the aperture region. This paper describes the modifications which make the Butler matrix symmetric and the method for terminating the network on the symmetry plane so as to achieve a reflective matrix. A computer program has been written to generate and plot these network configurations.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 September 1979
 DOI:
 10.1109/TAP.1979.1142158
 Bibcode:
 1979ITAP...27..651S
 Keywords:

 Antenna Arrays;
 Antenna Design;
 Antenna Feeds;
 Computer Aided Design;
 Matrices (Circuits);
 Network Synthesis;
 Antenna Radiation Patterns;
 Computer Graphics;
 Computer Programs;
 Couplers;
 Communications and Radar