FILTER DEVICE AND RADIO-FREQUENCY FRONT-END CIRCUIT
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United States of America Patent
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Issued Date -
Jul 25, 2024
app pub date -
Jan 5, 2024
filing date -
Jan 20, 2023
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Abstract
A filter device includes a stacked body, an input terminal, an output terminal, a ground terminal, a ground electrode, first and second resonators, and a coupling electrode. The input, output and ground terminals are located on a lower surface of the stacked body. The first and second resonators are in a signal transmission path between the input and output terminals. The coupling electrode capacitively couples the first and second resonators. The first and second resonators respectively include first and second capacitor electrodes defining capacitors with the ground electrode. The coupling electrode is connected to the first capacitor electrode and defines a capacitor with the second capacitor electrode. The coupling electrode includes first and second electrodes. First ends of the first and second electrodes are connected to each other. Second ends of the first and second electrodes are connected to the first capacitor electrode.
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