Filter circuit module, filter circuit element, filter circuit, and communication apparatus
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United States of America Patent
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Dec 5, 2023
Grant Date -
Oct 28, 2021
app pub date -
Jul 9, 2021
filing date -
Feb 22, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A filter circuit module includes a filter circuit element, a circuit board with the filter circuit element mounted thereon, and a first inductor. The filter circuit element includes a resonant circuit capacitor defining a portion of an LC parallel resonant circuit, and a phase-shift circuit. The circuit board includes a second inductor. A primary coil and a secondary coil of the phase-shift circuit are overlapped with the second inductor, viewed in a direction of a winding axis. The resonant circuit capacitor is closer to a mounting surface on which the filter circuit element is mounted on the circuit board, compared with the primary coil and the secondary coil. The resonant circuit capacitor includes a capacitor electrode covering a coil opening of the primary coil and a coil opening of the secondary coil, viewed in the direction of the winding axis.
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