EP 0614243 A1 19940907 - Electrical filter.
Title (en)
Electrical filter.
Title (de)
Elektrisches Filter.
Title (fr)
Filtre électrique.
Publication
Application
Priority
FI 930945 A 19930303
Abstract (en)
A filter comprises at least a pair of resonators (RES1,RES2) having an amplifier (AMP) inductively or capacitively coupled between the pair of resonators so that the power of an input signal input at IN passes through the amplifier and output at OUT to provide filtered and amplified output signal. By integrating an amplifier into the filter, this removes the need for an amplifier usually provided externally to the filter, thus saving space in a product incorporating this filter.This filter could be used as part of a duplex filter of a radio transceiver, where, for example,the amplifier could replace one of the stages of a multistage amplifier in the transmission branch of the radio transceiver. <IMAGE>
IPC 1-7
IPC 8 full level
H01P 1/20 (2006.01); H01P 1/203 (2006.01); H03H 7/01 (2006.01); H03H 11/04 (2006.01)
CPC (source: EP)
H01P 1/2039 (2013.01)
Citation (search report)
- [Y] US 4168479 A 19790918 - RUBIN DAVID
- [XY] W. SCHWAB ET AL.: "A low-noise active bandpass filter", IEEE MICROWAVE AND GUIDED WAVE LETTERS, vol. 3, no. 1, January 1993 (1993-01-01), NEW YORK US, pages 1 - 2, XP000331564, DOI: doi:10.1109/75.180671
- [Y] PATENT ABSTRACTS OF JAPAN vol. 11, no. 288 (E - 542) 17 September 1987 (1987-09-17)
- [Y] PATENT ABSTRACTS OF JAPAN vol. 9, no. 53 (E - 301)<1776> 7 March 1985 (1985-03-07)
- [X] ANTENNAS AND PROPAGATION SOCIETY SYMPOSIUM June 24-28,1991,Ontario,CA;IEEE,NewYork,US,1991 Digest,Vol. 1; pages 230-233
Designated contracting state (EPC)
CH DE DK FR GB IT LI SE
DOCDB simple family (publication)
EP 0614243 A1 19940907; AU 5633994 A 19940908; CA 2116367 A1 19940904; FI 92964 B 19941014; FI 92964 C 19950125; FI 930945 A0 19930303; JP H06350392 A 19941222
DOCDB simple family (application)
EP 94301243 A 19940222; AU 5633994 A 19940224; CA 2116367 A 19940224; FI 930945 A 19930303; JP 3221494 A 19940302