Improved Extraction of Coupling Matrix and Unloaded Q From S-Parameters of Lossy Resonator Filters

Wang, Rui; Xu, Jun; Wei, Chao; Wang, Maoyan; Zhang, Xiaochuan

doi:10.2528/pier11072804

Cited by 23 publications

(31 citation statements)

References 15 publications

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“…In this diplexer design, 15 parameters, including 5 main couplings, 6 self-couplings, and 4 external Q values, need to be tuned to obtain the acceptable diplexer responses. To accelerate the diplexer design, the methods presented in [20,21] can be applied to guide the tuning of each channel in the diplexer. After tuning, physical dimensions of the diplexer 1 are obtained as shown in Figure 4(b).…”

Section: Synthesis and Design Of Diplexer With Type-i Junction (Diplementioning

confidence: 99%

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Wang¹,

Xu²,

Wang³

et al. 2012

PIER

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Abstract-This paper presents a method for synthesizing coupled resonator diplexers composed of T X and RX filters (two types of junctions connecting the T X and RX filters are considered). For the first junction type, the common port is directly coupled to the first resonator of the T X and RX filters, respectively. For the second junction type, common node is realized by adding an extra resonator besides those of the T X and RX filters. The method is based on the evaluation of the characteristic polynomials of the diplexer using the proposed linear frequency transformation and well-established method, and then the "N + 3" coupling matrix of overall diplexer can be obtained using hybrid optimization methods. Two diplexers have been designed and fabricated to validate the proposed method.

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Section: Synthesis and Design Of Diplexer With Type-i Junction (Diplementioning

confidence: 99%

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Wang¹,

Xu²,

Wang³

et al. 2012

PIER

Self Cite

View full text Add to dashboard Cite

show abstract

“…As wireless communications systems have required tighter microwave filter specifications, a tremendous amount of studies has been devoted to developing new filter design theories and topologies [1][2][3][4][5][6][7][8]. Recently, studies on negative coupling structures have presented physical realization of frequency responses with transmission zeros that enhance the frequency selectivity.…”

Section: Introductionmentioning

confidence: 99%

New Negative Coupling Structure for Substrate-Integrated Cavity Resonators and Its Application to Design of an Elliptic Response Filter

Lee¹,

Lee²,

Kim³

et al. 2013

PIER

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Abstract-This paper presents a new type of a negative coupling structure for designing elliptic-response filters with cross-coupling. The proposed coupling structure consists of short-circuited coupled transmission lines. Using the fact that insertion phase of the coupled line structure is different from that of an inductive iris, it is shown that the proposed coupling structure can be used as the negative coupling structure. In order to verify the proposed coupling structure, we designed a 4th-order cross-coupled elliptic-response bandpass filter with substrate integrated waveguide resonators. A pair of transmission zeros in measurement and simulation results validates that the proposed structure can be used as the negative coupling structure.

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“…The advantage of the coupling matrix is that its entries are directly related to the position of the physically tunable elements. Recently researches have reported new methods of coupling matrix synthesis [12][13][14][15][16][17]. When dealing with (N +2)×(N +2) coupling matrix formulas for reflection S 11 and transmission S 21 are as follows [18]:…”

Section: General Conceptmentioning

confidence: 99%

Filter Tuning Based on Linear Decomposition of Scattering Characteristics

Kacmajor¹,

Michalski²

2013

PIER

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Abstract-This paper proposes a microwave filter post-production tuning based on an optimization process which finds the vector of deviations of tuning elements that should be applied to tune the filter. To build the system, the coarse set of scattering parameters is collected in such a way that every tuning element is detuned while other elements remain in their proper positions. In the concept, it is assumed that the relation between the positions of tuning elements and filter scattering characteristics can be modelled by the sum of one argument polynomial functions. Each polynomial function depends on the value of only one tuning element. Therefore, the measured filter characteristics can be linearly decomposed to characteristics from the collected coarse set and corresponding tuning element deviations can be found. This is done by way of optimization process. The presented numerical and physical experiments on the 7th order cross-coupled, bandpass filter have verified our approach.

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Improved Extraction of Coupling Matrix and Unloaded Q From S-Parameters of Lossy Resonator Filters

Cited by 23 publications

References 15 publications

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

New Negative Coupling Structure for Substrate-Integrated Cavity Resonators and Its Application to Design of an Elliptic Response Filter

Filter Tuning Based on Linear Decomposition of Scattering Characteristics

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