Global Patent Index - EP 0704924 B1

EP 0704924 B1 2000-01-26 - Dielectric filter

Title (en)

Dielectric filter

Title (de)

Dielektrisches Filter

Title (fr)

Filtre diélectrique

Publication

EP 0704924 B1 (EN)

Application

EP 95306254 A

Priority

  • JP 23182994 A
  • JP 23183094 A
  • JP 10140095 A
  • US 46944395 A

Abstract (en)

[origin: EP0704924A1] A single-stage dielectric band elimination filter has a dielectric block (101) with its outer surfaces mostly covered by an outer conductor and two mutually coupled resonant lines (102, 103) formed therein. Each resonant line has an open end insulated from the outer conductor and a shorted end connected thereto, the open and shorted ends of the two resonant lines (102, 103) being oppositely orientated. A multi-stage dielectric filter has a plurality of such single-stage band elimination filters formed inside a dielectric block, each mutually adjacent pair of the single-stage band elimination filters being interdigitally coupled or combline-coupled to each other with phase shift of pi /2 therebetween. The open end of a resonant line may be formed at one of the end surfaces of the dielectric block, being connected to an electrode insulated from the outer conductor, or at an annular conductor-free area formed on the inner surface of the corresponding throughhole. The resonant lines for forming the plurality of single-stage band elimination filters may be arranged horizontally or vertically with respect to each other. Screening electrodes may be inserted between mutually adjacent resonant lines. <IMAGE>

IPC 1-7

H01P 1/205

IPC 8 full level

H01P 1/205 (2006.01)

CPC

H01P 1/2056 (2013.01)

DCS

DE FR GB

DOCDB simple family

EP 0704924 A1 19960403; EP 0704924 B1 20000126; DE 69514746 D1 20000302; KR 100201707 B1 19990615; KR 960012603 A 19960420