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Performance investigation of microstrip exponential tapered line impedance transformer using MathCAD

Esa, M., Noordini, N., Abd Malik, N., Abdul latif, N. and Marimuthu, J. (2009) Performance investigation of microstrip exponential tapered line impedance transformer using MathCAD. In: Progress In Electromagnetics Research Symposium, 18 - 21 August 2009, Moscow, Russia

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Impedance transformer is an essential part of a system which allows two different loads to be perfectly connected without any loss due to reflections. This paper presents investigations performed on a microstrip exponential taper impedance, ETLI, transformer. Mathematical computations were performed using MathCAD software. The reflection coeffcient and return loss responses are in good agreement with theory. Broadband characteristics have been observed. To further investigate the performance of the taper, the ETLI transformer is simulated. Four different load impedances have been considered and various lengths of ETLI were investigated. It was found that as the frequency increases, the number of optimum lengths has also increased with a smaller difference between the optimum lengths. The same pattern occurs with any load impedance, from 70 to 100 Ohm. In addition, the behaviour of ETLI transformer with variation of loads at a particular frequency showed that 80Ohm load appeared to be the most matched. As the frequency increases, higher loads are matched with longer ETLI. Different loads are well- matched with longer ETLI transformers at higher frequencies from 6 GHz.

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