Cascaded triplet filter design using cascade synthesis approach

Yildirim, N.; Karaaslan, Muharrem; Yang, Sui; Sen, Ozlem

doi:10.1109/mwsym.1999.779532

Cited by 4 publications

(2 citation statements)

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“…The resulting circuit is then converted into a direct-coupled resonator form by applying Norton transformations to both series elements. The whole circuit is then converted into a CT section by applying row-column operations applied to the admittance matrix of the direct-coupled resonator circuit, as described in [14] and [19]. Row-column operations target elimination of unwanted couplings, reduction of LC-type coupling into simple -or -type coupling, and introduction of the desired coupling, resulting in several distinct solutions.…”

Section: ) Amentioning

confidence: 99%

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A revision of cascade synthesis theory covering cross-coupled filters

Yildirim

Sen²,

Yang³

et al. 2002

IEEE Trans. Microwave Theory Techn.

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The classical zero-shifting technique is generalized to cover extraction of complex transmission zeros (TZs) in the form of fourth-order LC sections whereby the -and -axis TZs appear as special cases. Using this approach, bandpass filters can be synthesized in direct coupled resonator forms by pole placement instead of designing them through low-pass prototypes. By using circuit transformations, the resulting direct coupled resonator filter circuits can then be transformed into a variety of cross-coupled forms like a fully cross-coupled form or cascaded -tuplet form. It is shown that one or more finite -axis, -axis, or complex TZs can be extracted as direct coupled resonator circuit blocks, which can be converted into cross-coupled triplets, quadruplets, or other -tuplets of resonators. In particular, it is shown that a cascaded quadruplet section can be used to realize a complex TZ quadruplet = , as well as two pairs of -axis TZs, = , and = .

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Section: ) Amentioning

confidence: 99%

“…Both Pfitzenmaier's and Levy's approaches lead to symmetric amplitude response, as their approaches are based on low-pass prototypes. Next, coupled triplets are introduced for the realization of single -axis TZs for asymmetric amplitude response [14], [17], [19]- [21], leading to cascaded triplet (CT) filters [see Fig. 1(f)].…”

Section: Introductionmentioning

confidence: 99%