Numerical Synthesis Design of Coupled Resonator Filters

Wen, Shenjie; Li, Zhu

doi:10.2528/pier09041102

Cited by 24 publications

(12 citation statements)

References 11 publications

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“…This stainless steel plasma chamber is 24 cm in height and 30 cm in diameter with four multi purpose ports. A 1.2 cm thick quartz plate is used at the top opening of the chamber to insulate the water cooled spiral planar coil from the plasma chamber [9,10]. The quartz plate, not only insulate the coil electrode from the plasma chamber but also helps in making the plasma chamber vacuum tight.…”

Section: Methodsmentioning

confidence: 99%

Symmetric and Asymmetric Double Langmuir Probes Characterization of Radio Frequency Inductivley Coupled Nitrogen Plasma

Naz¹,

Ghaffar²,

Rehman³

et al. 2011

PIER

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Abstract-The symmetric and asymmetric double Langmuir probe systems with their necessary driving circuits are developed for characterization of low pressure inductively coupled nitrogen plasma, generated and sustained with 13.56 MHz RF source and an automatic impedance matching network. First of all, the plasma parameters such as ion saturation current, electron temperature and electron number density are determined with symmetric double probe system at different input RF powers, filling gas pressures and radial distance from the plasma chamber wall. Then the electron temperature and electron energy probability function are determined with asymmetric double probe system at the centre of the discharge plasma chamber by changing the filling gas pressure and input RF power. It is observed that the electron temperature and electron number density increase with the increase in input RF power and radial distance but decreases with the increase in filling gas pressure. The electron energy probability function determined with asymmetric probe system evidently deviates from the Maxwellian, particularly at low filling gas pressures.

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Section: Methodsmentioning

confidence: 99%

Symmetric and Asymmetric Double Langmuir Probes Characterization of Radio Frequency Inductivley Coupled Nitrogen Plasma

Naz¹,

Ghaffar²,

Rehman³

et al. 2011

PIER

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“…On the other hand, non-minimum phase filters are more expensive than classical singlepath solutions because of their higher complexity. The main drawback concerns tuning, which is more involved; this is due to the presence of additional coupling elements [2,3]. In addition, in high power applications, despite the fact that often tight specifications on group delay must be accomplished, multipaths are not well suited.…”

Section: Introductionmentioning

confidence: 99%

On the Use of Gegenbauer Prototypes in the Synthesis of Waveguide Filters

Cifola

Morini²,

Venanzoni³

2011

PIER C

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Abstract-Filter prototypes derived from Gegenbauer polynomials can represent a useful trade-off between amplitude and phase behavior. This paper discusses the main features of this prototype through a comparison with the more classical Chebyshev and Butterworth solutions; it shows, in the case of an X-band waveguide realization, how its intermediate characteristics, with respect to both amplitude and phase responses, can be very useful in satisfying particular filter performance requirements without increasing filter order.

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“…Finally, the CM is extracted from the polynomials of S-parameters by well-known established technique [12]. Besides [12], a method in [13] for numerically synthesizing the CM of coupled resonator filters was introduced. However, it was only suitable for the canonical quadruplet structure.…”

Section: Introductionmentioning

confidence: 99%

Extracting Coupling Matrix and Unloaded Q From Scattering Parameters of Lossy Filters

Wang¹,

Xu²

2011

PIER

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Abstract-This paper presents a method for extracting the coupling matrix and the unloaded Q from the measured (or electromagnetic simulated) S-parameters of a narrow band cross-coupled resonator bandpass filter with losses. The Cauchy method is applied to determine the characteristic polynomials of the S-parameters of a filter in the normalized low-pass frequency domain. A five-parameter optimization method is proposed to obtain the unloaded Q and to remove the phase shift of the measured S-parameters, which is caused by the phase loading and the transmission lines at the input/output ports of a filter. Once the characteristic polynomials of the S-parameters with the phase shift removed have been determined, the coupling matrix of a filter with a given topology can be extracted using well established techniques. Two application examples are given to illustrate the validity of the proposed method.

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Numerical Synthesis Design of Coupled Resonator Filters

Cited by 24 publications

References 11 publications

Symmetric and Asymmetric Double Langmuir Probes Characterization of Radio Frequency Inductivley Coupled Nitrogen Plasma

Symmetric and Asymmetric Double Langmuir Probes Characterization of Radio Frequency Inductivley Coupled Nitrogen Plasma

On the Use of Gegenbauer Prototypes in the Synthesis of Waveguide Filters

Extracting Coupling Matrix and Unloaded Q From Scattering Parameters of Lossy Filters

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