A Design Method of Wideband BPF Considering Frequency Dependence of Inverters for SAW Filter

Jang, Youna; Kim, Junho; Ha, Jong-Su; Kim, Dong–Su; Lim, Jongsik; Han, Sang‐Min; Ahn, Dal

doi:10.1109/imfw49589.2021.9642283

Cited by 3 publications

(6 citation statements)

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“…However, the practical inverter models for implementing the BPF structure exhibit a frequency dependency based on the image admittance and phase terms, as listed in Table 1. The conventional circuit [16] depicted in Figs. 1(c) and (d) has the frequencydependent terms of image admittance corresponding to = 0 or (1−ω 2 LC) = 0, by applying c = J/ω 0 , L = 1/ω 0 J.…”

Section: A Analysis Of Inverter Types and Center Frequencymentioning

confidence: 99%

“…However, these types exhibit changes in their immittances as the frequency varies. This frequency dependency degrades the filter response since the inverter values do not vary linearly with the frequency [8]. These practical inverters require phase compensation for frequency variations to design a wideband bandpass filter.…”

Section: Phase Compensationmentioning

confidence: 99%

“…Design optimization or iterative design techniques must be implemented to overcome the frequency degradation. Consequently, several frequency-compensating structures [4][5][6][7][8] have been proposed to achieve a wideband filter design, such as the use of various inverter types. [4] proposed a bandwidth contraction factor and center frequency deviation for a cavity filter to predict changes caused by frequency-dependent coupling structures.…”

Section: Introductionmentioning

confidence: 99%

“…The inverter structure for practical BPF implementation has a magnitude term as well as phase characteristics based on the frequency. A conventional circuit [16] was proposed to improve the frequency-dependent parameters based on a novel J-inverter model. However, only the phase compensation was performed in [16], and it still exhibited frequency degradation.…”

Section: Introductionmentioning

confidence: 99%

“…A conventional circuit [16] was proposed to improve the frequency-dependent parameters based on a novel J-inverter model. However, only the phase compensation was performed in [16], and it still exhibited frequency degradation.…”

Section: Introductionmentioning

confidence: 99%

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An Accurate Design Method of Wideband BPF Considering Frequency Dependence of Inverters

Jang

Ahn

2023

JICCE

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This paper presents a design method for a wideband bandpass filter (BPF) which compensates for frequency dependency based on the image admittance and image phase. In the proposed method, new compensation methods for the admittance and phase are integrated with the conventional method. The proposed method improves the frequency shift and reduces the unwanted bandwidth when designing more than 20% of the Fractional Bandwidth (FBW), whereas the conventional method exhibits frequency degradation at only 10% FBW. The proposed design theory was verified by applying it to both lumped elements and distributed lines through circuit simulation and measurements without an optimization process. The measurement results demonstrate improvements in the frequency shift and target bandwidth. In the future, an accurate design method based on frequency dependence can be implemented for the next-generation broadband communication system applications.

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Section: A Analysis Of Inverter Types and Center Frequencymentioning

confidence: 99%

Section: Phase Compensationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations