Design of high-isolation wideband dual-polarized compact MIMO antennas with multi-objective optimization

Multi-objective optimization design of compact MIMO antennas with canonical structures (viz., transformation or combination by regular shapes) for wideband radiation and fragment structures (viz., combination by discrete fragment patches) for high isolation is proposed and demonstrated. In the design, MOEA/D-DE for optimization of canonical structures and MOEA/D-GO for optimization of fragment structures are combined and iterated. The design is demonstrated with compact bow-tie MIMO antennas sharing a small common ground plane. The four orthogonally deployed bow-tie antennas are optimized by using MOEA/D-DE to acquire dual polarization and wideband radiation. Fragment-type structures on the common ground plane are optimized by using MOEA/D-GO to acquire very high isolation. Both simulation and measurement show that the optimized MIMO bow-tie antennas provide isolation higher than 30dB in a relative bandwidth of 4o% (from 2.6GHz to 3.9GHz). With the proposed design technique, dual-band high isolation MIMO antennas may also be designed

Planar multiband antenna for 3G/4G advanced wireless services

A compact planar multiband antenna for 3G/4G mobile terminals is presented. The proposed design consists of a Sierpinski Gasket fractal geometry perturbed according to a Particle Swarm optimization (PSO) strategy in order to operate in advanced wireless services (AWS-1, 1710?1755 MHz, 2110?2155 MHz) and worldwide interoperability for microwave access (WiMAX, 3300?3600 MHz) bands. Numerical and experimental results assess the effectiveness of the proposed prototype in its multiband operations fitting the project constraints