Balanced-to-Balanced and Balanced-to-Unbalanced Power Dividers With Ultra-Wideband Common-Mode Rejection and Absorption Based on Mode-Conversion Approach

Chen, Siang; Lee, Wei-Chiang; Wu, Tzong‐Lin

doi:10.1109/tcpmt.2018.2877803

Cited by 18 publications

(8 citation statements)

References 23 publications

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“…The electromagnetic interference noise similarly plays a very important role on the performance of overall systems. Hence balanced components like balanced power divider [3], balanced coupler [4], [5], and balanced filter [6], [7] with the advantages of good common-mode suppression (CMS) and high immunity to environmental and device electronic noise have been widely studied. Moreover, for the microwave circuits comprising both balanced and unbalanced ports, an additional balun is required, which leads to bulky size and large in-band insertion loss.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Balanced-to-Unbalanced In-Phase Filtering Power Divider With Wide Upper Stopband and Wideband Common-Mode Suppression

Wang

Zhu

et al. 2021

IEEE Access

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A miniaturized balanced-to-unbalanced in-phase filtering power divider with wide upper stopband and wideband common-mode suppression is proposed. The in-phase feature is realized by the coupled/non-coupled lines. The stub with shunt-capacitor is used to realize the functions of filtering and miniaturization. The closed-form design equations are provided and discussed. To verify the design equations, one prototype with a center frequency of 1.0 GHz is designed and fabricated. The measured differential return loss is greater than 15 dB in the range of 0.82-1.22 GHz (39.2%). The upper stopband rejection is better than 20 dB from 1.41 to 3.57 GHz. Common-mode suppression is greater than 20 dB from 0 to 3.7 GHz. The measured results are in good agreement with electromagnetic simulations.INDEX TERMS Balanced to unbalanced, filtering power divider, circuit miniaturization, in-phase, wide stopband.

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Section: Introductionmentioning

confidence: 99%

A Miniaturized Balanced-to-Unbalanced In-Phase Filtering Power Divider With Wide Upper Stopband and Wideband Common-Mode Suppression

Wang

Zhu

et al. 2021

IEEE Access

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“…A broadband CM noise absorption circuit has been put forward using resistors for high-speed differential digital systems [18]. Afterwards, several balanced-to-balanced power dividers have been introduced with CM noise absorption characteristic based on resistors [19], [20] and modeconversion approach [21].…”

Section: Introductionmentioning

confidence: 99%

A Bidirectional Absorptive Common-Mode Filter Based on Interdigitated Microstrip Coupled Lines for 5G “Green” Communications

Guan

Tentzeris

2020

IEEE Access

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This paper proposes a bidirectional absorptive common-mode filter (A-CMF) for 5G ''green'' communication systems. The A-CMF is a balanced-to-balanced structure using interdigitated coupled lines to replace normal double parallel-coupled lines for enhanced coupling and easy manufacturing. The resistors are introduced to dissipate the common-mode (CM) noises into heat and thus to avoid the noises being reflected and still existing in the communication system. This novel A-CMF features an intrinsic CM noises absorption while maintaining its differential-mode (DM) filtering characteristics. As a proof-of-concept demonstration, one microstrip prototype is fabricated in a two-layer printed circuit board (PCB) and the measurements are consistent with the simulations. The DM signals can pass through this A-CMF without being attenuated from 1.38 GHz to 5.19 GHz but the CM noises are suppressed throughout the broad frequency range between 0.72 GHz and 8 GHz. It is worth noting that this A-CMF realizes a wide band with 90% absorption efficiency of CM noises from 2.18 GHz to 4.97 GHz. INDEX TERMS Absorptive common-mode filter (A-CMF), common-mode (CM), differential-mode (DM), noise absorption, reflectionless filter, green communication.

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“…In all the approaches mentioned above, conducted EMI are modeled as the superposition of differential-mode (DM) and common-mode (CM) noise. Such separation is essential in EMI modeling and filter design [13][14][15][16][17][18]. It is well-known; however, that such sharp separation between DM and CM noise is possible only under the assumption that the converter is perfectly symmetrical with respect to the ground.…”

Section: Introductionmentioning

confidence: 99%

Circuit Modeling and Statistical Analysis of Differential-to-Common-Mode Noise Conversion Due to Filter Unbalancing in Three-Phase Motor Drive Systems

Bellan

2020

Electronics

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This work deals with circuit modeling of noise mode conversion due to system asymmetry in a three-phase motor drive system. In fact, it is well-known that in case of system asymmetry (e.g., slightly asymmetrical LC filter parameters), differential-mode noise can convert into common-mode noise, resulting in increased level of conducted electromagnetic interference. This phenomenon has been observed with measurements and reported in previous works, but a clear and rigorous analytical description is still a challenging point. The main novelty proposed in the paper is a rigorous analytical description of differential-to-common-mode noise conversion based on the Clarke transformation and the eigenvalue analysis. In particular, the magnitude and the frequency location of the differential-mode resonances injected into the common-mode circuit are derived in closed form. Moreover, since system asymmetry is usually uncontrolled (e.g., component tolerance and parasitic elements), a statistical analysis is also presented by treating the parameters of the LC filter as random variables. Thus, a second contribution proposed in the paper is the analytical derivation in closed form of the probability density function, the mean value, and the standard deviation of the random frequency location of the resonance peaks injected into the common-mode circuit. The importance of the analytical results derived in the paper is two-fold. First, a deep theoretical understanding of the phenomenon in terms of circuit theory concepts is achieved. Second, the impact of differential-to-common-mode noise conversion is described in quantitative terms. Thus, the obtained analytical results can be used to predict or explain the noise conversion impact on the frequency-domain measurements of common-mode currents. Theoretical derivations are validated through a time-domain Simulink implementation of a three-phase motor drive system, and a frequency-domain analysis through the discrete Fourier transform.

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Balanced-to-Balanced and Balanced-to-Unbalanced Power Dividers With Ultra-Wideband Common-Mode Rejection and Absorption Based on Mode-Conversion Approach

Cited by 18 publications

References 23 publications

A Miniaturized Balanced-to-Unbalanced In-Phase Filtering Power Divider With Wide Upper Stopband and Wideband Common-Mode Suppression

A Miniaturized Balanced-to-Unbalanced In-Phase Filtering Power Divider With Wide Upper Stopband and Wideband Common-Mode Suppression

A Bidirectional Absorptive Common-Mode Filter Based on Interdigitated Microstrip Coupled Lines for 5G “Green” Communications

Circuit Modeling and Statistical Analysis of Differential-to-Common-Mode Noise Conversion Due to Filter Unbalancing in Three-Phase Motor Drive Systems

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