LADDER FILTER, DEMULTIPLEXER AND MODULE

• Main Authors: TAKAHASHI NAOKI, MIYAKE TOMOYUKI
• Format: Patent
• Language: English; Japanese
• Published: 05.01.2017
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

PROBLEM TO BE SOLVED: To allow for compaction.SOLUTION: A ladder filter includes one or a plurality of series resonators S1-S4 connected in series between an input terminal In and an output terminal Out, a plurality of parallel resonators P1-P4 connected in parallel between the input terminal and output terminal, and a path 10 including at least two inductors L1-L4 connected between in series at at least two points between the ground terminals of the plurality of parallel resonators, and between the ground terminal of the parallel resonators on the most input terminal side or the most output terminal side and the ground, while electrically interconnecting the ground terminals of the plurality of parallel resonators, respectively, and electrically connecting to the ground only via the ground terminal of the most input terminal side or the most output terminal side parallel resonator.SELECTED DRAWING: Figure 3 【課題】小型化を可能とすること。【解決手段】入力端子Ｉｎと出力端子Ｏｕｔとの間に直列に接続された１または複数の直列共振器Ｓ１−Ｓ４と、前記入力端子と前記出力端子との間に並列に接続された複数の並列共振器Ｐ１−Ｐ４と、前記複数の並列共振器のそれぞれのグランド端子を互いに電気的に接続し、最も前記入力端子側または最も前記出力端子側の並列共振器のグランド端子のみを介しグランドに電気的に接続し、前記複数の並列共振器のグランド端子の間と、前記最も前記入力端子側または前記最も前記出力端子側の並列共振器のグランド端子とグランドとの間と、のうち少なくとも２箇所に直列に接続された少なくとも２つのインダクタＬ１−Ｌ４を含む経路１０と、を具備するラダー型フィルタ。【選択図】図３