Surface acoustic wave filter and mobile communication system...

H - Electricity – 03 – H

Patent

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H03H 9/64 (2006.01) H03H 9/145 (2006.01)

Patent

CA 2110362

A composite surface acoustic wave filter includes an interdigitated interdigital surface acoustic wave filter having input and output terminals. Two one-port surface acoustic wave resonators are electrically connected in series to the interdigitated interdigital surface acoustic wave filter respectively at the input and output terminals, the one-port surface acoustic wave resonators having antiresonant frequencies in a stop band that is close to and higher than the passband of the interdigitated interdigital surface acoustic wave filter. Two other one-port surface acoustic wave resonators are electrically connected parallel to the interdigitated interdigital surface acoustic wave filter, the one-port surface acoustic wave resonators having resonant frequencies in a stop band that is close to and lower than the passband of the interdigitated interdigital surface acoustic wave filter.

L'invention est un filtre composite à ondes acoustiques de surface constitué d'un filtre interdigité à bornes d'entrée et de sortie. Deux résonateurs à ondes acoustiques de surface à port unique sont connectés électriquement en série à l'élément de filtrage interdigité, respectivement aux bornes d'entrée et de sortie, ces résonateurs ayant leurs fréquences d'antirésonance dans une bande de blocage située immédiatement au-dessus de la bande passante de l'élément de filtrage interdigité. Deux autres résonateurs à ondes acoustiques de surface à port unique sont connectés électriquement en parallèle à l'élément de filtrage interdigité, ces résonateurs ayant leurs fréquences de résonance dans une bande de blocage située immédiatement au-dessous de la bande passante de l'élément de filtrage interdigité.

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