The impact of a matching circuit of a handset MIMO antenna on the wideband channel capacity

摘要

In the plan for future cellular systems, such as the LTE-advanced system, they are to be allocated a very wide frequency band. Hence, the wideband characteristics must be considered when a handset MIMO antenna is designed for such systems. In the literature [1], the authors have shown that there is a significant impact of a matching circuit on the channel capacity of a MIMO antenna over a wide frequency band. In [1], as a basic study, a MIMO antenna comprised of two half-wavelength dipole antennas arranged in a parallel orientation is used for the analysis. However, the mechanism or principle responsible for the enhancement of channel capacity was not fully examined. This paper studies the impact of a matching circuit of a handset MIMO antenna mounted on a commercial-handset based small metal housing on the wideband channel capacity. Through extensive studies, we will give full consideration to the reason why a large channel capacity can be obtained by choosing an appropriate matching circuit.