Smart Antenna Array Analysis And Implementation

The demand for increased capacity in wireless networks has motivated recent research towards the development of techniques and standards. As a result, there are many efforts on the design of smart antenna arrays. Smart antenna systems provide opportunities for far coverage, high system capacity, improved quality of service, improved power control, and suppressed interference and multi-path fading. Smart antenna becomes one of key techniques in the TD-SCDMA systems, the 4th generation communication systems, and the commercial SCDMA systems. Being associated with research projects, this dissertation makes deeply insight into the fast and accurate analysis, optimal and manufacture of the SCDMA smart circular antenna arrays, panel antenna arrays and TD-SCDMA smart circular antenna arrays. The designs have been widely applied in the communication networks. The author's major contributions were shown below:1. A novel coaxial collinear printed dipole antenna is studied, using method of moment (MoM) with transmission line. The shaped elevation pattern is optimized through genetic algorithms. The approach has fast convergence and computation. The antenna has obtained the utility models patent.2. A novel design approach combing the genetic algorithm with finite difference time domain (GA-FDTD) is investigated for the fast optimal design of the SCDMA smart circular antenna elements and arrays. The fixed electrical down tilt 3°,6°and 9°SCDMA smart circular antenna arrays are implemented, and prevalently applied in the SCDMA communication networks.3. The GA-FDTD is used to analyze and design the SCDMA smart panel antenna array elements, and the antenna arrays are designed and optimized by the software "Ansoft HFSS". The antenna arrays have been applied in the SCDMA systems, and the reception level and signal-to-noise ratio are improved in the 60 percent test spots compared with the other antennas in the systems.4. Associated with "the State 863 Program Project", The TD-SCDMA smart circular antenna elements and arrays are analyzed using genetic algorithm combing with MoM (GA-MoM). The RF experimental results demonstrate the effectiveness of the analysis. The designs have been widely applied in the experimental TD-SCDMA systems.