Application of Butler Matrix to a Tree Structure of Microstrip Antenna Array
The aim of this investigation is to realize a Butler matrix for a
multibeam base station antenna dedicated to a UMTS
application; this matrix has been realized with microstrip
technology. The antenna associated with this application is a
network of patches distributed in a tree structure and fed by
electromagnetic coupling. The patch distribution structure used
in this experiment allowed a great improvement of gain,
directivity as well as the adaptation level of the studied array.
The following work was done between the signals, systems and
components laboratory of FST-Fez and the microwave laboratory
of the National Institute of Posts and Telecommunications.
Keywords: Butler Matrix, Adaptive Antenna, Microstrip Antenna array, Multibeams Antenna, Coupler
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