Mutual Inductance of Capacitor Low-Pass Filters

Fischer, Thomas; Kneuer, Christian; Albach, Manfred; Schubert, G.

doi:10.1109/emczur.2009.4783470

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…3 measurements are depicted. Filter A consists of four capacitors (each 47nF) and provides an attenuation of 50dB at 1GHz [4]. Filter B consists of a 3k resistor.…”

Section: Test Objectsmentioning

confidence: 99%

“…At first, the attenuation decrease in filter A is analyzed in detail. As known from [4], the Equivalent Series Inductance (ESL) can be calculated out of the mutual inductance between input and output loop. These loops are created by the traces and the capacitors.…”

Section: A Quasi-stationary Effectsmentioning

confidence: 99%

“…According to [4], the used partial loops to model the filter are perpendicular to the ground-plane and also to the metal cover plane. Thus, the mutual inductance (ESL) of the capacitor filter is increased due to a metal cover plane.…”

Section: A Quasi-stationary Effectsmentioning

confidence: 99%

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Influence of Adjacent Metal Cover Planes on EMC Filter Structures

Fischer

Schubert

Albach

2010

IEICE Trans. Commun.

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This paper deals with the influence of metal cover planes close to SMD filter structures. The low-pass structures are used for EMC purpose and work in a frequency range of 100 kHz to 4 GHZ. It will be shown by measurement and simulation that a close cover plane changes the filter behavior significantly in dependency of the filter component used. For low and high impedance filter structures different influences are obtained; a parameter study was carried out in order to derive design rules.

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“…3 measurements are depicted. Filter A consists of four capacitors (each 47nF) and provides an attenuation of 50dB at 1GHz [4]. Filter B consists of a 3k resistor.…”

Section: Test Objectsmentioning

confidence: 99%

Section: A Quasi-stationary Effectsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Adjacent Metal Cover Planes on EMC Filter Structures

Fischer

Schubert

Albach

2010

IEICE Trans. Commun.

Self Cite

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“…The frequency at which this parasitic inductive reactance is equal and opposite to the capacitive reactance, such that the insertion gain is minimized, is called the self-resonance frequency. Above the self-resonance frequency, the apparent magnitude of the capacitor's impedance increases due to mutual inductance [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

“…Conventional methods for improving the attenuation of a shunt capacitor filter at frequencies where the parasitic mutual inductance is dominant include reducing the capacitor shunt path length, reducing the trace height above the ground plane, using feed-through capacitors, using multiple capacitors on opposite sides of a trace [1], using multiple capacitors spaced apart [2], or using multiple capacitors on opposite sides of the board [4]. Recently, several parasitic inductance cancellation schemes have been described that use coupled inductors to create a negative mutual inductance [5]- [17].…”

Section: Introductionmentioning

confidence: 99%

Parasitic Inductance Cancellation for Surface Mount Shunt Capacitor Filters

McDowell

Hubing

2014

IEEE Trans. Electromagn. Compat.

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Parasitic mutual inductance between the input and output loops of a shunt capacitor filter limits the attenuation obtainable at high frequencies. This paper presents compact designs for integrated cancellation coils for surface mount shunt capacitor filters that enable these filters to be effective from megahertz to gigahertz frequencies. Computer inductance extraction tools are used to optimize the filter performance. Experiments are performed to validate the designs. A lumped element model of the filter describes the secondary parasitics that affect the performance and ultimately determine the bandwidth of the filter.

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Prediction of radiated emissions from cables with multiple connections to a metal plane

Hess²,

Hoeckele³

et al. 2015

2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

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The radiated emissions from a partially shielded cable mounted 5 cm above a metal plane have been found to be dominated by the emissions from the 5 cm vertical conductor segments, which connect the cable shield and the signal wires to the metal plane at various locations. An equivalent circuit model has been developed for predicting radiated emissions from the cable. As part of an extension from the developed model, an additional wire is included and pulled back in the test setup. The methodology of modeling is applied to this new setup by adding an additional transmission line for the wire against the metal plane, and by including the mutual inductance between the transmission lines, which accounts for the locations of the transmission lines. The predicted radiated emissions match the full-wave simulated radiated emissions, further validating the modelling technique that was previously developed. This modelling procedure can be used to determine if a system meets a given radiated emission specification before any actual testing is done. If the radiation is predicted to be excessive then design changes, such as additional filtering, can be modelled before the cabling is built to determine if the changes will allow the system to meet the radiated emissions specification before testing begins.

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Mutual Inductance of Capacitor Low-Pass Filters

Cited by 9 publications

References 5 publications

Influence of Adjacent Metal Cover Planes on EMC Filter Structures

Influence of Adjacent Metal Cover Planes on EMC Filter Structures

Parasitic Inductance Cancellation for Surface Mount Shunt Capacitor Filters

Prediction of radiated emissions from cables with multiple connections to a metal plane

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