✦ LIBER ✦

Computer-aided diagnosis of lossy microwave coupled resonators filters

✍ Scribed by Rui Wang; Jun Xu

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 299 KB
Volume: 21
Category: Article
ISSN: 1096-4290
DOI: 10.1002/mmce.20537

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✦ Synopsis

A method is presented for extracting the coupling matrix (CM) and the unloaded Q from the measured (or electromagnetic simulated) scattering parameters of a lossy coupled resonators bandpass filter. The method can be used for computer-aided tuning of a microwave filter. The method consists of two elements: 1) a three-parameter optimization method is proposed to obtain the unloaded Q (assuming all the resonators with the same unloaded Q) and to remove the phase shift of the measured S-parameters caused by the phase loading and the transmission lines at the input/output ports of a filter; 2) the Cauchy method is used for determining characteristic polynomial models of the S-parameters of a microwave filter in the normalized low-pass frequency domain. Once the characteristic polynomials of the S-parameters without phase-shift effects are determined, the CM of a filter with a given topology can be extracted using well-established techniques. Three diagnosis examples illustrate the validity of the proposed method.

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