SURFACE ACOUSTIC WAVE FILTER, AND SHARED DEVICE FOR ANTENNA
A surface acoustic wave filter for use in a mobile telecommunication device such as a cellular phone comprises a plurality of surface acoustic wave resonators connected in series, and it can be designed easily. A ground electrode (12), surface acoustic wave resonators (15a-15c) arranged in series, t...
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| Main Authors | , , , |
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| Format | Patent |
| Language | English French Japanese |
| Published |
16.12.1999
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| Edition | 6 |
| Subjects | |
| Online Access | Get full text |
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| Abstract | A surface acoustic wave filter for use in a mobile telecommunication device such as a cellular phone comprises a plurality of surface acoustic wave resonators connected in series, and it can be designed easily. A ground electrode (12), surface acoustic wave resonators (15a-15c) arranged in series, terminal electrodes (16a-16d) and interdigital electrodes (20a-20d) formed on the terminal electrodes (16a-16d) are formed on the surface of a piezoelectric substrate (11). The interdigital electrodes (20a-20d) and the ground electrode (12) form capacitors (19a-19d). Thus, the surface acoustic wave resonators (15a-15c) can be designed independently of the capacitors (19a-19d).
L'invention concerne un filtre à ondes de surface destiné à être utilisé dans un dispositif de télécommunication mobile tel qu'un téléphone cellulaire. Ce filtre de conception simple comprend une pluralité de résonateurs à ondes de surface connectés en série. Une électrode de masse (12), des résonateurs à ondes de surface (15a-15c) montés en série, des électrodes à bornes (16a-16d) et des électrodes interdigitées (20a-20d) formées sur ces dernières, sont formés sur la surface d'un substrat piézo-électrique (11). Les électrodes interdigitées (20a-20d) et l'électrode de masse (12) forment des condensateurs (19a-19d). Par conséquent, les résonateurs à ondes de surface (15a-15c) peuvent être conçus indépendamment des condensateurs (19a-19d). |
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| AbstractList | A surface acoustic wave filter for use in a mobile telecommunication device such as a cellular phone comprises a plurality of surface acoustic wave resonators connected in series, and it can be designed easily. A ground electrode (12), surface acoustic wave resonators (15a-15c) arranged in series, terminal electrodes (16a-16d) and interdigital electrodes (20a-20d) formed on the terminal electrodes (16a-16d) are formed on the surface of a piezoelectric substrate (11). The interdigital electrodes (20a-20d) and the ground electrode (12) form capacitors (19a-19d). Thus, the surface acoustic wave resonators (15a-15c) can be designed independently of the capacitors (19a-19d).
L'invention concerne un filtre à ondes de surface destiné à être utilisé dans un dispositif de télécommunication mobile tel qu'un téléphone cellulaire. Ce filtre de conception simple comprend une pluralité de résonateurs à ondes de surface connectés en série. Une électrode de masse (12), des résonateurs à ondes de surface (15a-15c) montés en série, des électrodes à bornes (16a-16d) et des électrodes interdigitées (20a-20d) formées sur ces dernières, sont formés sur la surface d'un substrat piézo-électrique (11). Les électrodes interdigitées (20a-20d) et l'électrode de masse (12) forment des condensateurs (19a-19d). Par conséquent, les résonateurs à ondes de surface (15a-15c) peuvent être conçus indépendamment des condensateurs (19a-19d). |
| Author | SAKURAGAWA, TORU MURAKAMI, KOZO YUDA, NAOKI FUJII, KATSUYA |
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| DocumentTitleAlternate | FILTRE A ONDES DE SURFACE, ET DISPOSITIF PARTAGE POUR UNE ANTENNE |
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| Notes | Application Number: WO1999JP03141 |
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| RelatedCompanies | MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD SAKURAGAWA, TORU MURAKAMI, KOZO YUDA, NAOKI FUJII, KATSUYA |
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| Snippet | A surface acoustic wave filter for use in a mobile telecommunication device such as a cellular phone comprises a plurality of surface acoustic wave resonators... |
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| SubjectTerms | BASIC ELECTRONIC CIRCUITRY ELECTRICITY IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS RESONATORS |
| Title | SURFACE ACOUSTIC WAVE FILTER, AND SHARED DEVICE FOR ANTENNA |
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