Dielectric waveguide filter
    2.
    发明授权

    公开(公告)号:US11362406B2

    公开(公告)日:2022-06-14

    申请号:US17110386

    申请日:2020-12-03

    Abstract: A dielectric waveguide filter includes at least four dielectric waveguide resonators arranged along a main coupling path for signal propagation, and main coupling portions each of which is provided between the dielectric waveguide resonators that are adjacent to each other along the main coupling path among the at least four dielectric waveguide resonators. The main coupling portions include an inductive coupling portion and a capacitive coupling portion, and the inductive coupling portion and the capacitive coupling portion are alternately and repeatedly arranged along the main coupling path.

    Variable filter circuit
    3.
    发明授权

    公开(公告)号:US10355666B2

    公开(公告)日:2019-07-16

    申请号:US15617355

    申请日:2017-06-08

    Abstract: A variable filter circuit includes: a series arm connected in series between a signal input terminal and a signal output terminal; a parallel arm connected between the series arm and a ground terminal that has a resonator; and a variable reactance portion in the parallel arm, and the resonator of a parallel arm at an initial stage connected to the signal input terminal that has a resonant frequency fr and an anti-resonant frequency fa that satisfy 100×(fn−fr)/(fa−fr)≤23.9(%) for communication bands for each of which a stop band is set so as to be close to a high-frequency side of a pass band, among the plurality of communication bands, where a resonant frequency is fr, an anti-resonant frequency is fa, and a cutoff frequency at a high-frequency side of a pass band of each communication band is fn.

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