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1. CA2262977 - FILTRE A ELLIPSE ET SON PROCEDE DE FABRICATION

Office
Canada
Numéro de la demande 2262977
Date de la demande 01.07.1997
Numéro de publication 2262977
Date de publication 26.02.1998
Numéro de délivrance
Date de délivrance 06.11.2001
Type de publication C
CIB
H03H 9/54
HÉLECTRICITÉ
03CIRCUITS ÉLECTRONIQUES FONDAMENTAUX
HRÉSEAUX D'IMPÉDANCES, p.ex. CIRCUITS RÉSONNANTS; RÉSONATEURS
9Réseaux comprenant des éléments électromécaniques ou électro-acoustiques; Résonateurs électromécaniques
46Filtres
54comprenant des résonateurs en matériau piézo-électrique ou électrostrictif
CPC
H03H 3/04
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
3Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
007for the manufacture of electromechanical resonators or networks
02for the manufacture of piezo-electric or electrostrictive resonators or networks
04for obtaining desired frequency or temperature coefficient
H03H 9/02078
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
02Details
02007of bulk acoustic wave devices
02062Details relating to the vibration mode
02078the vibration mode being overmoded
H03H 9/542
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
46Filters
54comprising resonators of piezo-electric or electrostrictive material
542including passive elements
H03H 9/56
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
46Filters
54comprising resonators of piezo-electric or electrostrictive material
56Monolithic crystal filters
H03H 9/54
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
46Filters
54comprising resonators of piezo-electric or electrostrictive material
Déposants MOTOROLA, INC.
Inventeurs PRADAL, BORTOLO M.
Données relatives à la priorité 08701825 23.08.1996 US
Titre
(EN) ELLIPTIC FILTER AND METHOD OF MAKING THE SAME
(FR) FILTRE A ELLIPSE ET SON PROCEDE DE FABRICATION
Abrégé
(EN) 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.