Surface acoustic wave device

H - Electricity – 03 – H

Patent

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Details

H03H 9/64 (2006.01) H03H 9/72 (2006.01) H03H 9/76 (2006.01) H04B 1/02 (2006.01) H04B 1/06 (2006.01)

Patent

CA 2234513

A surface acoustic wave device includes first and second SAW filters and first, second and third SAW resonators. The first SAW filter has first and second ends and a first pass band in a first frequency region, and the second SAW filter has first and second ends and a second pass band in a second frequency region which is lower than the first frequency region. The second end of the second SAW filter is connected to the second end of the first SAW filter in parallel to form a connection point. The first and second one-port SAW resonators are connected in series between the second end of the first SAW filter and the connection point, and have an antiresonant frequency higher than the frequency of the pass band of the first SAW filter The third one-port SAW resonator connected in series between the second end of the second SAW filter and the connection point and has an antiresonant frequency higher than the frequency of the pass band of the second SAW filter.

L'invention est un dispositif à ondes acoustiques de surface (OAS) qui comprend un premier et un second filtre OAS et un premier, un deuxième et un troisième résonateur OAS. Le premier filtre OAS a une première et une seconde extrémité et une première bande passante dans une première bande de fréquences et le second filtre OAS a une première et une seconde extrémité et une seconde bande passante dans une seconde bande de fréquences inférieure à la première bande de fréquences. La seconde extrémité du second filtre OAS est connectée en parallèle à la seconde extrémité du premier filtre OAS pour former un point de connexion. Le premier et le deuxième résonateur OAS monoport sont connectés en série entre la seconde extrémité du premier filtre OAS et le point de connexion et ont une fréquence d'antirésonance supérieure aux fréquences de la bande passante du premier filtre OAS. Le troisième résonateur OAS monoport est connecté en série entre la seconde extrémité du second filtre OAS et le point de connexion et a une fréquence d'antirésonance supérieure aux fréquences de la bande passante du second filtre OAS.

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