EP 0373028 B1 19940518 - Passive band-pass filter.
Title (en)
Passive band-pass filter.
Title (de)
Passives Bandpassfilter.
Title (fr)
Filtre passif passe-bande.
Publication
Application
Priority
- FR 8815664 A 19881130
- FR 8908017 A 19890616
Abstract (en)
[origin: EP0373028A1] The invention relates to a passive band-pass filter constructed by means of microstrips on a dielectric substrate (4). This filter is composed of at least three microstrips (6,7,8), which are parallel to one another and one end of which is grounded (5). At least two microstrips (6,8) which are not adjacent are coupled by a coupling impedance Z (12). The distances x1, x2, x3, x4 of fixings on the microstrips of the input (10), coupling impedance Z (12) and output (11) regulate the impedances and the characteristics of the filter. A first improvement permits the narrowing of the pass band, by means of a high impedance (17) in parallel on the input (E) of the filter. A second impedance (18), in series on the input, corrects the input impedance modification. A second improvement consists in folding the filter back on itself, in order to reduce its space requirement. Continuity of the microstrip lines (6,7,8) is ensured by metallised coatings (20) on the flanks of the substrate (4), and jumper links (21) provide the channels for access to the filter and its fixing means.
IPC 1-7
IPC 8 full level
H01P 1/203 (2006.01)
CPC (source: EP)
H01P 1/20336 (2013.01)
Designated contracting state (EPC)
AT BE CH DE GB IT LI NL SE
DOCDB simple family (publication)
EP 0373028 A1 19900613; EP 0373028 B1 19940518; AT E105976 T1 19940615; CA 2004184 A1 19900531; DE 68915408 D1 19940623; DE 68915408 T2 19940908; FI 895714 A0 19891129; FR 2648641 A2 19901221; FR 2648641 B2 19940909
DOCDB simple family (application)
EP 89403257 A 19891124; AT 89403257 T 19891124; CA 2004184 A 19891129; DE 68915408 T 19891124; FI 895714 A 19891129; FR 8908017 A 19890616