Synthesis of lossy filters

Senior, Bamtri; Hunter, I.C.; Rhodes, John David

doi:10.1109/euma.2002.339307

Cited by 16 publications

(13 citation statements)

References 5 publications

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“…As an example, consider the following transmission function: dB (11) which is obtained by scaling by 4 dB a lossless third-order allpoles Chebyshev function (i.e., ). The equally scaled reflection function is found with (12) Note that the poles and are assigned to , whereas is assigned to .…”

Section: A Nonredundant Networkmentioning

confidence: 99%

A New Approach to the Synthesis of Microwave Lossy Filters

Oldoni

Macchiarella

Gentili

et al. 2010

IEEE Trans. Microwave Theory Techn.

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In this paper, we first present a novel synthesis method based on an even-and odd-mode decomposition. This method is capable of synthesizing a network under very general hypotheses and is, therefore, suitable for lossy filter design. To exploit the increased flexibility of this new synthesis method over the traditional lossy design techniques, we then introduce a new approach to the design of lossy filters based on the characteristic polynomials evaluation. This new technique can offer many advantages over traditional techniques, and the main one is that, once the transmission function of the filter is known using traditional methods, the reflection function can be constrained with a certain degree of freedom. A tradeoff between additional constraints and redundancy in the final network must be accepted. Finally, we present design examples and a practical realization, which validate this novel approach to the design of lossy filters.Index Terms-Lossy filters, microwave filter synthesis, polynomial filter synthesis.

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Section: A Nonredundant Networkmentioning

confidence: 99%

A New Approach to the Synthesis of Microwave Lossy Filters

Oldoni

Macchiarella

Gentili

et al. 2010

IEEE Trans. Microwave Theory Techn.

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“…Based on the synthesis procedure, the even and odd mode analysis of [2] and [3] which is originally used for symmetric networks could be applied to asymmetric networks when the response satisfies the conditions in (7) and (8).…”

Section:    'mentioning

confidence: 99%

“…The method of predistortion [1] provides the denominator polynomial of lossy transfer functions with uniform resonator losses. The method given [2] determines lossy circuits based on even and odd modes analysis. The filter networks realized either have dissipations only at the input and output resonators or have complex cross couplings which are difficult to implement.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of coupling matrix for lossy filter networks

Meng

Hunter

2015

2015 IEEE MTT-S International Microwave Symposium

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-A generalized method for the synthesis of lossy microwave filters is given in this paper. An equation on the polynomials of S parameters is given to replace the power conservation. When the polynomials of S parameters satisfy a given condition, it is guaranteed that the admittance parameters as well as the coupling matrix (CM) can be derived from the S parameters. Two special cases are discussed for solving the refection function from a prescribed transfer function. In the first case, F 11 (the numerator of S 11 ) equals to F 22 (the numerator of S 22 ). This is the case that is equivalent to the even/odd mode analysis but is extended to be applied for asymmetric filter responses. In the second case, the loss distribution among a filter network is given. A method of iteration is applied to derive the CM with the prescribed loss distribution. The method is an extension to the conventional method of predistortion with nonuniform resonator Qs and lossy invertors.

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“…A third option is to improve the selectivity of a lossy filter by increasing the degree of the network [10]. The result is similar to a predistorted transmission-mode filter but with improved return loss.…”

Section: Transmission Filtersmentioning

confidence: 99%