公开(公告)号：EP0852846A1

公开(公告)日：1998-07-15

申请号：EP96932623.0

申请日：1996-09-20

申请人： THOMSON-CSF

发明人： SOLAL, Marc ,  DESBOIS, Jean

IPC分类号： H03H9

CPC分类号： H03H9/6463 ,  H03H9/0028 ,  H03H9/6479

摘要： The filter of the invention includes: a first acoustic channel (20) formed of a first transducer, comprising first and second bonding pads (23 and 24), arranged between a first reflector (25) and a second reflector (26) to form a first resonator; a second acoustic channel (21) formed of a second transducer, comprising third and fourth bonding pads (27 and 28), arranged between a third reflector (29) and a fourth reflector (30) to form a second resonator, and a third acoustic channel (22) formed of a third transducer, comprising fifth and sixth bonding pads (31 and 32), arranged between a fifth reflector (33) and a sixth reflector (34) to form a third resonator. Each bonding pad of the transducers is connected to a predetermined potential. The invention is useful for mobile radio filters.

公开(公告)号：EP0646296A1

公开(公告)日：1995-04-05

申请号：EP94909149.0

申请日：1994-03-04

申请人： THOMSON-CSF

发明人： SOLAL, Marc ,  VENTURA, Pascal ,  HODE, Jean-Michel

IPC分类号： H03H9

CPC分类号： H03H9/14505 ,  H03H9/02685

摘要： A distributed acoustic reflection transducer has a reflection function comprising at least one sign change, i.e. it has at least one reflector (7) and generally a set of reflectors with a centre at a distance k lambda /2 + lambda /4 from the centre of the other reflectors, lambda being the wavelength corresponding to the operational centre frequency of the transducer. Said transducer may be used to produce surface wave filters for radio systems.

公开(公告)号：EP0608249A1

公开(公告)日：1994-08-03

申请号：EP92918770.0

申请日：1992-08-28

申请人： THOMSON-CSF

发明人： HODE, Jean-Michel ,  DESBOIS, Jean ,  SOLAL, Marc

IPC分类号： H03H9

CPC分类号： H03H9/0057 ,  H03H9/02653 ,  H03H9/0285 ,  H03H9/02905

摘要： Filtre hyperfréquence à ondes acoustiques de surface et à cavités résonnantes longitudinales. Il est constitué de plusieurs voies (V1, V2) en parallèle, qui présentent une différence d'espace inter-transducteurs (21-41; 22-42) égale à un multiple pair de demi-longueur d'onde (lambda) à la fréquence centrale, d'une voie à l'autre, de façon à annuler la fonction de transfert en ligne à retard qui correspond au trajet direct entre transducteurs.

公开(公告)号：EP0608249B2

公开(公告)日：2000-04-12

申请号：EP92918770.6

申请日：1992-08-28

申请人： THOMSON-CSF

发明人： HODE, Jean-Michel ,  DESBOIS, Jean ,  SOLAL, Marc

IPC分类号： H03H9/64

CPC分类号： H03H9/0057 ,  H03H9/02653 ,  H03H9/0285 ,  H03H9/02905

公开(公告)号：EP0852846B1

公开(公告)日：1999-07-14

申请号：EP96932623.0

申请日：1996-09-20

申请人： THOMSON-CSF

发明人： SOLAL, Marc ,  DESBOIS, Jean

IPC分类号： H03H9/64

CPC分类号： H03H9/6463 ,  H03H9/0028 ,  H03H9/6479

公开(公告)号：EP0646296B1

公开(公告)日：1997-01-22

申请号：EP94909149.0

申请日：1994-03-04

申请人： THOMSON-CSF

发明人： SOLAL, Marc ,  VENTURA, Pascal ,  HODE, Jean-Michel

IPC分类号： H03H9/145

CPC分类号： H03H9/14505 ,  H03H9/02685

摘要： A distributed acoustic reflection transducer has a reflection function comprising at least one sign change, i.e. it has at least one reflector (7) and generally a set of reflectors with a centre at a distance k μ/2 + μ/4 from the centre of the other reflectors, μ being the wavelength corresponding to the operational centre frequency of the transducer. Said transducer may be used to produce surface wave filters for radio systems.

公开(公告)号：EP0608249B1

公开(公告)日：1995-10-11

申请号：EP92918770.6

申请日：1992-08-28

申请人： THOMSON-CSF

发明人： HODE, Jean-Michel ,  DESBOIS, Jean ,  SOLAL, Marc

IPC分类号： H03H9/64

CPC分类号： H03H9/0057 ,  H03H9/02653 ,  H03H9/0285 ,  H03H9/02905

摘要： A microwave surface acoustic wave filter having longitudinal cavity resonators and consisting of a number of parallel channels (V1, V2) which have a transducer spacing difference (21-41; 22-42) which is equal to an even half-wavelength (μ) multiple at the centre frequency, whereby the delay line transfer function corresponding to the direct channel between the transducers is cancelled.