This paper presents a newly developed dielectric embedded and electronically steerable multiple beam (DE-ESMB) antenna and its applications in wireless communication system. The DE-ESMB antenna can be also used in a wireless computing system. DE-ESMB is a smart mobile terminal antenna using switching antenna technology and size reduction techniques. The significant performance of the DE-ESMB smart antenna has been achieved in terms of the size reduction and switched beamforming. The paper also discusses the optimal design techniques of using a high-performance computer to design the DE-ESMB antenna array.