Systematic approach for electrically tuning N-port antenna system based on characteristic modes

We develop, in this paper, a systematic approach to be applied for matching/tuning N-port symmetric antenna system whose design is based on the characteristic modes of a device. The approach uses conformal mapping techniques and allows us to study the feasibility and possible implementation of a “joint matching” to simultaneously match several radiation modes. The approach helps to conclude about the available modes that could be physically matched and to decide about possibly making some amendments on the antenna design. It renders the tuning range of elements of the tunable matching network. Theoretical derivation is supported by the measured scattering parameters of a MIMO antenna system operating in the range [470, 790] MHz.

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