FILTER APPARATUS AND RADIO-FREQUENCY FRONT END CIRCUIT INCLUDING THE SAME
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United States of America Patent
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Issued Date -
May 30, 2024
app pub date -
Feb 7, 2024
filing date -
Aug 12, 2021
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Abstract
A filter apparatus includes a dielectric substrate, input and output terminals, a ground terminal, a common electrode, and first to fourth resonators. Each resonator is connected to the common electrode and the ground terminal. Third and fourth resonators are between first and second resonators. Each resonator includes a capacitor and first and second vias connected to the common electrode. The first via is connected to the ground terminal with the capacitor interposed therebetween. The second via is directly connected to the ground terminal. In the common electrode, a direction from the first via to the second via in the first resonator is opposite to a direction from the first via to the second via in the second resonator. In third and fourth resonators, a shortest path along the common electrode between the first vias intersects with a shortest path along the common electrode between the second vias.
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