Novel UWB multilayer Butler matrix

Smart antennas are introduced to improve the performance of wireless systems and increase their capacity by spatial filtering, which can separate spectrally and temporally overlapping signals from multiple users. Switched beams systems are referred as smart antenna system that forms multiple fixed beams with enhanced sensitivity in a specific area. This antenna system detects signal strength, selects one of the several predetermined fixed beams, and switches from one beam to another for tracking moving users. One of the most widely-known of switched beam networks is Butler matrix [1].

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