EP 2164129 B1 20130717 - Electrically tunable bandpass filters
Title (en)
Electrically tunable bandpass filters
Title (de)
Elektrisch abstimmbare Bandpassfilter
Title (fr)
Filtres passe-bande syntonisables par voie électronique
Publication
Application
Priority
- EP 02778409 A 20020927
- US 41300902 P 20020923
- US 32570101 P 20010927
Abstract (en)
[origin: WO03028146A1] A tunable bandpass filter includes at least one resonator having a reactance with a resonant frequency, a ferroelectric film having a dielectric constant with a value that changes with an applied electric field, and an electric field generating device for generating relatively constant electric fields of different strengths. The ferroelectric film is electrically coupled to the resonator so that the reactance of the resonator and therefore the resonant frequency of the resonator and the passband of the filter depends on the dielectric constant of the ferroelectric film. The electric field generating device is constructed and arranged to generate relatively constant electric fields within the ferroelectric film, thereby making the resonant frequency of the resonator and the passband of the filter a function of the strength of the relatively constant electric field.
IPC 8 full level
H01P 1/00 (2006.01); H01P 1/203 (2006.01)
CPC (source: EP KR)
H01P 1/203 (2013.01 - EP KR); H01P 1/20336 (2013.01 - EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
WO 03028146 A1 20030403; AT E473528 T1 20100715; BR 0212843 A 20050628; CA 2461886 A1 20030403; CN 1592985 A 20050309; DE 60236947 D1 20100819; EP 1433219 A1 20040630; EP 1433219 B1 20100707; EP 2164129 A1 20100317; EP 2164129 B1 20130717; EP 2309586 A1 20110413; EP 2309586 B1 20140101; IL 161064 A0 20040831; JP 2006503445 A 20060126; JP 4071712 B2 20080402; KR 101036117 B1 20110523; KR 101250060 B1 20130403; KR 20040037175 A 20040504; KR 20090074274 A 20090706; MX PA04002907 A 20040705; NO 20041903 L 20040615; RU 2004112757 A 20050327
DOCDB simple family (application)
US 0231118 W 20020927; AT 02778409 T 20020927; BR 0212843 A 20020927; CA 2461886 A 20020927; CN 02823334 A 20020927; DE 60236947 T 20020927; EP 02778409 A 20020927; EP 09177702 A 20020927; EP 10185327 A 20020927; IL 16106402 A 20020927; JP 2003531553 A 20020927; KR 20047004545 A 20020927; KR 20097011258 A 20020927; MX PA04002907 A 20020927; NO 20041903 A 20040426; RU 2004112757 A 20020927