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    EMI filter and frequency filters having capacitor with inductance cancellation loop

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    7180389.pdf (815.1Kb)
    Downloads: 110
    Publication Date
    2007-02-20
    Filing Date
    2004-12-17
    Inventor
    Lee, Fred C.
    Odendaal, Willem G.
    Wang, Shuo
    Metadata
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    Abstract
    An electromagnetic interference (EMI) filter or frequency filters (e.g. bandpass or band reject filters) in which a capacitor has an inductance cancellation loop. Inductive coupling between capacitors can allow undesired high frequencies to propagate across a filter. This is particularly a concern when the capacitors are oriented in parallel. In the present invention, the inductance cancellation loop is disposed adjacent to one capacitor so that mutual inductance between the capacitors is reduced. The attenuation of the filter at high frequencies is thereby increased. The loop can increase voltage attenuation of an EMI filter by about 20 dB. In another aspect, inductors in the filter are oriented horizontally relative to a circuitboard. Horizontal orientation reduces leakage inductance coupling between the inductors and circuitboard traces, and between the inductor and capacitors, thereby preventing unwanted propagation of high frequencies. Both measures in combination can provide a voltage attenuation increase of 30 dB.
    Assignee
    Virginia Tech Intellectual Properties, Inc.
    Patent Number
    7180389
    Application Number
    11013930
    Source URL
    http://pimg-fpiw.uspto.gov/fdd/89/803/071/0.pdf
    Primary/U.S. Class
    333/181
    Other/U.S. Class
    333/185
    361/306.2
    CPC Class
    H03H7/427
    H03H7/175
    H03H7/1758
    H03H7/1766
    H03H7/1775
    H03H2001/005
    H04B3/28
    Patent Type
    utility
    URI
    http://hdl.handle.net/10919/72553
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    • Virginia Tech Patents [621]

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