Performance analysis of multi-band multiple beamforming butler matrix for smart antenna systems

The main aim of this paper is to produce the multiband multiple Beamforming using Butler matrix was designed so as to cover the multiband frequencies of 2.8GHz, 6.4GHz, and 9GHz. The multiband hybrid coupler, multiband crossover and multi band phase shifters are used to design a multiband butler matrix. The conventional Butler matrix design was modified for single band frequency. For the demand developments of multi-band antennas, Butler matrix should operate in multiband frequencies in smart antenna systems in order to cover broad range of applications in modern-day telecommunication systems. In addition, the circuit functioning at Multiband is helpful to raise the integration level of the system and, there is a need to increase number of frequency bands used by systems and also to assign a new frequency bands for newly developed ones. Therefore, the performance of Multiband Butler matrix designs is to verify the analysis and simulations are done.