Approximation of filter characteristic to tuning elementpositions using coarse set

This paper proposes a new approach In building a multidimensional approximator which maps filter scattering characteristic to the vector containing deviations of tuning element positions. In the concept, it is assumed that relation between positions of tuning elements and filter scattering characteristic can be modeled by the sum of polynomial functions. Each polynomial function only depends on the value of one tuning element. A coarse set of filter characteristics and tuning element positions is used in building the approximator which models this relation. This set is collected by detuning only one tuning element from its proper position at a time, while other elements remain in their proper positions. The presented numerical and physical experiments verified our approach.