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Filter Model Generation from Scattering Parameters using the Cauchy Method

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3 Author(s)
Lamperez, Alejandro Garcia ; Dpto. Se??ales, Sistemas y Radiocomunicaciones, ETSI Telecomunicaci??n, Universidad Polit??cnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain. Tel: 34-91-336-7358, e-mail: lamperez@gmr.ssr.upm.es ; Sarkar, Tapan K. ; Palma, Magdalena Salazar

A method to obtain an accurate band-pass filter model from numerically computed or measured data is presented. A modified new version of the Cauchy technique that uses simultaneously both transmission (S21(f)) and reflection (S11(f)) parameters is applied in order to find a rational polynomial characterization of the filter. From this rational model the coupling structure can be extracted, revealing the differences with the designed one. An application example of a narrow-band and a wide-band model of a microstrip filter is presented.

Published in:

Microwave Conference, 2002. 32nd European

Date of Conference:

23-26 Sept. 2002