Heterogeneous Combination for Compact Integrated Diversity Multi-Antenna System

In this paper, we present a compact co-located multi- antenna system suitable for integration into mobile terminal. The primary idea of this design is a close combination of a Planar Inverted-F Antenna (PIFA) and a radiating notch preserving high isolation. Both simulated and measured radio characteristics are discussed. Design keys are given for bandwidth, efficiency and compactness. Diversity performances are evaluated through effective gain and envelope correlation in typical indoor and outdoor mobile environments considering various polarization conditions. The proposed multi-antenna system is compared with canonical solutions for polarization diversity and shows better diversity performances for mitigating fading or Multiple Input Multiple Output MIMO schemes.