2013
DOI: 10.2528/pier13032903
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A Hybrid Computer-Aided Tuning Method for Microwave Filters

Abstract: Abstract-A hybrid tuning method for microwave filters is presented in this paper. This novel tuning technique is based on the combination of the Cauchy method and aggressive space mapping (ASM) technique. Cauchy method is applied to determine the characteristic polynomials of the filter's response, then the parameters (coupling matrix) of the low-pass prototype is extracted from the characteristic polynomials. The aggressive space mapping is used to optimized the fine model to guarantee that each step of a tun… Show more

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Cited by 5 publications
(6 citation statements)
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“…1(b), the simulated response of filter 1 is compared to the extraction one calculated by the extracted CM in Eq. (14). Very good agreement between the simulated and extracted responses can be observed.…”
Section: Diagnosis Of a Sixth-order Filter With Four Tzs (Filter 1)mentioning
confidence: 52%
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“…1(b), the simulated response of filter 1 is compared to the extraction one calculated by the extracted CM in Eq. (14). Very good agreement between the simulated and extracted responses can be observed.…”
Section: Diagnosis Of a Sixth-order Filter With Four Tzs (Filter 1)mentioning
confidence: 52%
“…Early filter diagnosis techniques can be traced back to the 1970s and 1980s [1,2]. In the past years, interest is growing on the filter diagnosis methods for extracting the coupling matrix of microwave filters from the measurements (or simulations) with losses [3][4][5][6][7][8][9][10][11][12][13][14][15]. These filter diagnosis or coupling matrix (CM) extraction techniques require two sorts: 1) CM extraction techniques are based on optimization (as in [3][4][5]) for matching the measured scattering parameters, whose elements are the problem unknowns.…”
Section: Introductionmentioning
confidence: 99%
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“…Lastly, the poles and residues of the Y-parameters are obtained by using the partial fraction expansion method. The phase shift of the dual port caused by the high-order mode and transmission line is as follows [17]:…”
Section: Removal Of Non-ideal Factorsmentioning
confidence: 99%
“…Lastly, the poles and residues of the Y ‐parameters are obtained by using the partial fraction expansion method. The phase shift of the dual port caused by the high‐order mode and transmission line is as follows [17]: φ1=φ01+α1ω/ω0,0.3333emnbsp0.3333emnbsp0.3333emnbsp0.3333emnbspφ2=φ02+α2ω/ω0, where φ 01 and φ 02 denote the phase loading caused by higher‐order modes; α1ω/ω0 denotes the phase shift introduced by the transmission line at a sampling frequency ω , α 1 and α 2 denote the equivalent electrical length of input and output transmission lines, respectively; and ω 0 denotes the centre frequency. The relationship between the measured and the ideal S ‐parameters is as follows: []S=-0.17em[]matrixcenterk11S11ej2φ1centerk12S12ejfalse(φ1+φ2false)centerk21S21ejfalse(φ1+φ2false)centerk22S22ej2φ2 …”
Section: Extraction Of Poles and Residuesmentioning
confidence: 99%