Coupling matrix synthesis of general chebyshev filters

Liu, Qi; Xing, Dongqiu; Wang, Rui; Qi, Xinming; Zhao, Jing

doi:10.1051/matecconf/202030901011

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…There is a shift in the center frequency of the measured result compared to the simulation result. The shift is caused by discontinuities in the microstrip line junction, radiation, package parasitic, and dielectric loss of the material [26]. The transmission zeros of the filter can be controlled by changing the source capacitor values and the load coupling.…”

Section: Prototype Design Resultsmentioning

confidence: 99%

“…The initial filter design parameters are the center frequency of 3.5 GHz, a bandwidth of 200 MHz, an insertion loss (IL) of <3 dB, and an RL of 20 dB. The microstrip substrate of Rogers RT/duroid 5880, with a thickness of 787 μm and a relative dielectric constant ε r of 2.2 is used for the filter implementation [25][26][27]. The open-loop resonator is selected for this design because of its simplicity of manufacturing.…”

Section: Microstrip Filter Inter-resonator Couplingmentioning

confidence: 99%

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Design of Compact Parallel-Connected Chained Function Filters

Chinda,

Seoung,

Cheab

et al. 2023

J. Electromagn. Eng. Sci

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The design of compact parallel-connected chained function filters is presented in this paper. The proposed filters will offer reduced sensitivity to manufacturing tolerance within the specified bandwidth in comparison to conventional Chebyshev filters for C-band applications. A new filtering function according to a chained configuration is derived for fourth-order filters, and the synthesis procedures are presented. To demonstrate the feasibility of this approach, the circuit simulation based on parallel-connected topology is performed in an advanced design system, while the design and simulation of a fourth-order filter in dielectric technology are carried out in high-frequency simulation software. The prototype of fourth-order microstrip topology is fabricated using open-loop resonators. The overall circuit size of the filter is 2.5 cm × 4 cm. The achieved simulation and measured insertion/return loss are 0.409 dB/20 dB and 2.674 dB/18.074 dB, respectively. Extensive sensitivity analysis is conducted to prove the fabrication tolerance of the filter. The reduced sensitivity of the proposed filter to manufacturing tolerance is fully demonstrated using an open-loop microstrip technology, and its reliability is proven by theoretical analysis. The prototype results in this research are validated and agree with the theoretical results. In terms of implementation, this design technique will be a very useful mathematical tool for any filter design engineer.

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Section: Prototype Design Resultsmentioning

confidence: 99%

Section: Microstrip Filter Inter-resonator Couplingmentioning

confidence: 99%

Design of Compact Parallel-Connected Chained Function Filters

Chinda,

Seoung,

Cheab

et al. 2023

J. Electromagn. Eng. Sci

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show abstract

“…Once the appropriate characteristics polynomial satisfies the target filter specifications, the Chebyshev filter response requires a minimum tolerance to component value varia-tions and a specific unloaded-Q factor for each resonator [1]. It should be noted that slight changes in the filter design parameter will cause the filter's target response to deviate, particularly at higher frequency bands [8]. Thus, pre-, and post-manufacturing tuning processes can be challenging, time-consuming, and expensive.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Parallel-Connected Dielectric Filter Using Chain-Function Polynomial

Chinda¹,

Cheab²,

Soeung³

2023

RADIOENGINEERING

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Design and synthesis of parallel connected dielectric filters using chained function polynomials are presented in this paper. This filter will offer reduced sensitivity to fabrication tolerance while preserving its return loss response within the desired bandwidth in comparison to traditional Chebyshev filters. A novel transfer function FN according to chained is derived for fourth and sixth-order filters and the synthesis technique is presented. To demonstrate the feasibility of this approach, the circuit simulation based on parallel connected topology is carried out in ADS while the design and simulation of the fourth-order filter in dielectric technology in HFSS. Considerable sensitivity analysis is conducted to prove a better fabrication tolerance of the filter. In terms of implementation, this design technique will serve as a very useful mathematical tool for any filter design engineer.

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