An Immitance Based Tool for Modelling Passive One-Port Devices by Means of Darlington Equivalents

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An immitance-based method is presented to model measured or computed data, obtained from a “passive one-port physical device” by means of its Darlington equivalent. In other words, the given data is modelled as a lossless two port terminated in a unit resistor. The basis of the new modelling tool rests on the numerical decomposition of the given immitance data into its Foster and minimum parts. Therefore, the proposed technique does not require any choice for the circuit topology to build the model. Rather, the optimum circuit topology that characterises the given data is the natural consequence of the modelling process proposed in this paper. A main algorithm is presented to construct the model from the given data. It is expected that the proposed modelling tool will find practical applications in the behaviour characterisation, simulation, and design of high speed/high frequency analog/digital mobile communication sub-systems manufactured on VLSI chips. An antenna-modelling example is included to systematically exhibit the implementation of the modelling technique.

Keywords: Immitance Modelling; Passive Networks

Document Type: Original Article


Affiliations: 1: Işik University, 80670, Maslak, Istanbul, Turkey 2: Department of Electronics Engineering, Işik University, 80670, Maslak, Istanbul, Turkey 3: Nortel Networks – Netaş, Istanbul, Turkey

Publication date: December 1, 2001

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