EP 0560503 A1 19930915 - Electrical filter.
Title (en)
Electrical filter.
Title (de)
Elektrisches Filter.
Title (fr)
Filtre électrique.
Publication
Application
Priority
FI 921025 A 19920309
Abstract (en)
A filter (1) for filtering certain frequencies of an electric signal. The filter (1) comprises components (HX1-HX4) for forming the frequency response of the filter, and components (A,C) for accomplishing coupling and impedance matching. The filter is provided with a directional coupler (10) composed of two transmission lines (A,B), one of them being a coupling line (A) or an impedance matching line. <IMAGE>
IPC 1-7
IPC 8 full level
H01P 1/20 (2006.01); H01P 1/213 (2006.01); H01P 5/18 (2006.01); H04B 1/40 (2006.01)
CPC (source: EP)
Citation (search report)
- [X] US 3829770 A 19740813 - STEVENS H
- [Y] GB 749337 A 19560523 - STANDARD TELEPHONES CABLES LTD
- [Y] US 4433314 A 19840221 - HISLOP ALFRED R [US], et al
- [X] US 4232401 A 19801104 - CHANG YU-WEN, et al
- [A] EP 0117676 A2 19840905 - LUCAS IND PLC [GB]
- [A] GB 2156176 A 19851002 - LITTON SYSTEMS INC
- [XP] WO 9220163 A1 19921112 - MOTOROLA INC [US]
- [Y] PATENT ABSTRACTS OF JAPAN vol. 10, no. 244 (E-430)(2300) 22 August 1986 & JP-A-61 074 401 ( MATSUSHITA ELECTRIC IND. CO. LTD. ) 16 April 1986
- [Y] PATENT ABSTRACTS OF JAPAN vol. 10, no. 379 (E-465)(2436) 18 December 1986 & JP-A-61 172 402 ( MURATA MANUFACTURING CO LTD ) 4 August 1986
Designated contracting state (EPC)
CH DE DK FR GB IT LI SE
DOCDB simple family (publication)
EP 0560503 A1 19930915; EP 0560503 B1 19981104; AU 3397393 A 19930916; AU 661556 B2 19950727; CA 2091089 A1 19930910; DE 69321859 D1 19981210; DE 69321859 T2 19990512; DK 0560503 T3 19990719; FI 90478 B 19931029; FI 90478 C 19940210; FI 921025 A0 19920309; FI 921025 A 19930910; JP H06120708 A 19940428
DOCDB simple family (application)
EP 93301243 A 19930219; AU 3397393 A 19930303; CA 2091089 A 19930305; DE 69321859 T 19930219; DK 93301243 T 19930219; FI 921025 A 19920309; JP 4663793 A 19930308