EP 0053986 A3 19820721 - BANDPASS FILTER TUNABLE TO A PREDETERMINED NUMBER OF DISCRETE FREQUENCIES IN A BROAD FREQUENCY BAND
Title (en)
BANDPASS FILTER TUNABLE TO A PREDETERMINED NUMBER OF DISCRETE FREQUENCIES IN A BROAD FREQUENCY BAND
Publication
Application
Priority
FR 8026217 A 19801210
Abstract (en)
[origin: US4472695A] PCT No. PCT/FR81/00158 Sec. 371 Date Aug. 5, 1982 Sec. 102(e) Date Aug. 5, 1982 PCT Filed Dec. 9, 1981.Coaxial filter having at least one of the internal and external conductors which is divided into sections (S1 to S4) separated by breaks having to form of annular slits whose thickness is very slight in relation to the wavelength. Each section comprises at least one reactive tuning element such as an open or short-circuited coaxial line portion and at least one switch element located in the vicinity of the corresponding break in order selectivity to short-circuit the said break or bring about the insertion of the corresponding reactive tuning element in response to electronic control devices. Application to telecommuncations.
IPC 1-7
IPC 8 full level
H01P 1/202 (2006.01); H01P 7/04 (2006.01)
CPC (source: EP US)
H01P 1/202 (2013.01 - EP US)
Citation (search report)
- [Y] US 4004257 A 19770118 - GEISSLER ROBERT G
- [Y] US 3444485 A 19690513 - OKEAN HERMAN C
- [Y] US 3927347 A 19751216 - FARNEY GEORGE K
Designated contracting state (EPC)
BE CH DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0053986 A2 19820616; EP 0053986 A3 19820721; FR 2495844 A1 19820611; FR 2495844 B1 19840511; JP S57123701 A 19820802; US 4472695 A 19840918; WO 8603890 A1 19860703
DOCDB simple family (application)
EP 81401956 A 19811209; FR 8026217 A 19801210; FR 8100158 W 19811209; JP 19831781 A 19811209; US 40623382 A 19820805