Narrow beam adaptive array for advanced wireless applications

To help develop high performance adaptive phased array antennas, we examined the tradeoffs in implementing a hybrid approach that was described in an earlier publications [Z. Zhang et al., 2003]. Simulation results using both the LMS and CMA beamforming algorithms show that the hybrid approach described in Z. Zhang et al. (2003) actually successfully predicts DOA, but on the expense of the beam width. Narrower beam widths would require increasing number of elements and this may be possible to achieve and hence suitable for implementation in larger arrays. The performance of the hybrid beamforming approach was further simulated using measured radiation patterns from the new CPW-CTS antenna. Future extension of the proposed approach to the case of narrower beam width subarrays (single feed) in a larger CTS antenna array system is also described.