anyone know info about adaptive anntena design?

These two papers below are quite good introductory papers with a lot of references.

There is another author called Hans Steyskal who wrote tons of papers related to adaptive antenna arrays.

"Application of Antenna Arrays to Mobile Communications, Part I: Performance Improvement, Feasibility, and System Considerations," L. C. Godara, Proceedings of the IEEE, Vol. 85, No. 7, July 1997, pp. 1029-1060.

"Application of Antenna Arrays to Mobile Communications, Part II: Beam-Forming and Direction-of-Arrival Considerations," L. C. Godara, Proceedings of the IEEE, Vol. 85, No. 8, August 1997, pp. 1193-1245.

regards