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Some numerical aspects of characteristic mode decomposition

Characteristic mode decomposition represents popular and powerful numerical method which offers deep physical insight into radiation mechanisms and an effective framework for small antenna design. The quality of resultant characteristic basis is strongly dependent on the properties of the impedance matrix but also on utilized factorization technique, or the exact shape of the radiator. In this contribution, selected numerical aspects like incompleteness of the characteristic basis will be discussed. These observations will be proved to be important for practical usage of the characteristic modes.