EP 3379642 A1 20180926 - WAVEGUIDE FILTER
Title (en)
WAVEGUIDE FILTER
Title (de)
HOHLLEITERFILTER
Title (fr)
FILTRE DE GUIDES D'ONDES
Publication
Application
Priority
EP 17161989 A 20170321
Abstract (en)
Problem In prior-art high-frequency filters, to compensate for manufacturing tolerance, it is common practice to tune the filter using tuning elements such as threaded screws made of metal or various combinations of metal and plastics. Resonator casings made of aluminum require interference threads for receiving the corresponding tuning elements since aluminum is too soft for fine threads. Further, contamination of the aluminum used as raw material - such as by ferrite, nickel, steel or other ferromagnetic material - causes the casing to exhibit hysteresis when exposed to reversing magnetic fields, thus resulting in undesired passive intermodulation. Avoiding this intermodulation imposes a high degree of purity on the raw material employed, which in turn increases the unit cost of a filter manufactured from such material. Solution The problem is solved by a waveguide filter having a casing of material transparent to light of a designated lasing wavelength, the casing bearing an electrically conductive internal plating such that the casing defines a radio-frequency cavity, and dielectric resonators protruding into the cavity, the resonators being dimensioned such as to exhibit a given resonant frequency.
IPC 8 full level
H01P 1/208 (2006.01); H01P 11/00 (2006.01)
CPC (source: EP)
H01P 1/2084 (2013.01); H01P 11/007 (2013.01)
Citation (applicant)
- EP 2656435 A1 20131030 - KATHREIN WERKE KG [DE]
- JARRY; PIERRE ET AL.: "Advanced design techniques and realizations of microwave and RF filters", 2008, JOHN WILEY
- VICENTE; CARLOS ET AL.: "Passive Intermodulation Characteristics", IEEE TRANS. MICROWAVE THEOR. TECH., vol. 53, no. 8, 8 August 2005 (2005-08-08), pages 2515 - 2525
Citation (search report)
- [XI] US 2005219013 A1 20051006 - KUMAR PAVAN [CA], et al
- [XY] US 5329687 A 19940719 - SCOTT RICHARD D [US], et al
- [X] US 2003234695 A1 20031225 - HARUTA KAZUMASA [JP], et al
- [IY] US 2003048148 A1 20030313 - HUMPHREYS RICHARD G [GB], et al
- [A] US 7148762 B2 20061212 - WALTER THOMAS [DE], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 17161989 A 20170321