Elliptic filter and method of making the same

Details Elliptic filter and method of making the same Elliptic filter and method of making the same

H - Electricity

03

H

H03H 9/54 (2006.01)

Patent

CA 2262977

An odd order N-pole, (N-1)/2 zero elliptic filter (300) is provided having (N- 1)/2 BAW resonators (302 and 304). The first Bulk Acoustic Wave (BAW) resonator (302) operates at a first mode number and a first center frequency and the second BAW resonator (304) operates at a second mode number, and a first centre frequency. Operating BAW resonators (302 and 304) at differing modes allows the unwanted passbands (201) of the first BAW resonators (302) to be attenuated by the stopband of the second BAW resonator (304) and vice versa.

L'invention a pour objet un filtre à ellipse (300) zéro (N-1)/2, à N pôles et d'ordre impair, qui a des résonateurs BAW (Bulk Acoustic Wave) (N-1)/2 (302 et 304). Le premier résonateur BAW (302) fonctionne avec premier coefficient modal et à une première fréquence centrale, et le second résonateur BAW (304) fonctionne à un second coefficient modal et à une première fréquence centrale. Les résonateurs BAW (302 et 304) fonctionnant à des modes différents, les bandes passantes non désirées (201) du premier résonateur BAW (302) sont atténuées par la bande affaiblie du second résonateur BAW (304), et inversement.

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