PIEZOELECTRIC FILTER DEVICE

To make it possible to cope with wide and narrow passbands by using a single piezoelectric filter.SOLUTION: Impedances of input and output sides of a 4-pole piezoelectric filter 2 in which two 2-pole piezoelectric filter elements are connected in cascade are made to be different by first and second...

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Bibliographic Details
Main Author KODA NAOKI
Format Patent
LanguageEnglish
Japanese
Published 04.07.2019
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:To make it possible to cope with wide and narrow passbands by using a single piezoelectric filter.SOLUTION: Impedances of input and output sides of a 4-pole piezoelectric filter 2 in which two 2-pole piezoelectric filter elements are connected in cascade are made to be different by first and second impedance circuits 5, 6, center frequencies of the two piezoelectric filter elements are offset from each other, and input and output directions of a signal against the piezoelectric filter 2 are switched by first and second changeover switches 3, 4. Thereby, a width of a passband of the signal is switched.SELECTED DRAWING: Figure 1 【課題】単一の圧電フィルタを用いて通過帯域幅の広狭に対応できるようにする。【解決手段】２ポール型の圧電フィルタ素子の二つを縦続接続した４ポール型の圧電フィルタ２の入力側と出力側のインピーダンスを、第１，第２インピーダンス回路５，６によって異ならせると共に、二つの圧電フィルタ素子の中心周波数を互いにずらし、第１，第２切換えスイッチ３，４によって、圧電フィルタ２に対する信号の入出力方向を切換えることによって、信号の通過帯域幅の広狭を切換えるようにしている。【選択図】図１
Bibliography:Application Number: JP20170243682