EP0350256A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Band elimination filter
Assignee: Murata Manufacturing Co Ltd
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Filing: 1989-07-04
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Granted: —
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Expires: 2009-07-04
Abstract
Abstract A band elimination filter includes a filter circuit (10) which is formed by a dielectric resonator (11) exhibiting inductiveness at a frequency f₂ and a capacitor (12) connected in series with the dielectric resonator, and an input/output transmission line (13) which has an inductor (14) connected to the capacitor (12) of the filter circuit (10). Only the aforementioned filter circuit (10) is connected between an end portion of the inductor (14) and earthing means (15). In the band elimination filter having such structure, a signal attenuation amount is abruptly changed around the trap frequency f₂, to improve the passing characteristic.
Inventors
- 👤 Tadahiro C/O Murata Manufacturing Co. Ltd. Yorita
- 👤 Yoshiki C/O Murata Manufacturing Co. Ltd. Yamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 23:53
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2056
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A band elimination filter including: a filter circuit (10) formed by a resonator (11, 34) and capacitance means (12, 31, 32) connected in series with said resonator (11, 34); inductance means (14, 33, 36, 38) having an end portion; an input/output transmission line (13, 39) connected to said end portion of said inductance means (14, 33, 36, 38); and earthing means (15), only said filter circuit (10) being connected between said end portion of said inductance means (14, 33, 36, 38) and said earthing means (15).
Claim 2
Dependent Claim
86 words
A band elimination filter including: a filter circuit (10) formed by a resonator (11, 34) and capacitance means (12, 31, 32) connected in series with said resonator (11, 34); inductance means (14, 33, 36, 38) having an end portion; an input/output transmission line (13, 39) connected to said end portion of said inductance means (14, 33, 36, 38); and earthing means (15), only said filter circuit (10) being connected between said end portion of said inductance means (14, 33, 36, 38) and said earthing means (15).
Claim 3
Dependent Claim
31 words
A band elimination filter in accordance with claim 1, wherein said band elimination filter has a trap frequency (f₂), a signal attenuation amount being abruptly changed at said trap frequency (f₂).
Claim 4
Dependent Claim
28 words
A band elimination filter in accordance with claim 2, wherein said band elimination filter has an antiresonance frequency(f₁), a signal attenuation amount is small at said antiresonance frequency(f₁).
Claim 5
Dependent Claim
50 words
A band elimination filter in accordance with claim 1, wherein said resonator (11, 34) has an opening end (341), said capacitance means is a disc-type capacitor (37) which is connected to said opening end (341), and said inductance means is an inductor (38) which is connected to said capacitor (37).
Claim 6
Dependent Claim
20 words
A band elimination filter in accordance with claim 1, wherein said resonator (11, 34) is a dielectric resonator (11, 34).
Claim 7
Dependent Claim
80 words
A band elimination filter including: a resonator (34) having an opening end (341) and a central conductor (35); and a substrate (30) being provided in the vicinity of said opening end (341) of said resonator (34), said substrate (30) essentially comprising a first capacitor electrode4 (32) being electrically connected to said central conductor (35), a second capacitor (31) being paired with said first capacitor electrode (32) and inductor means (33, 36) being electrically connected to said second capacitor electrode (31).
Claim 8
Dependent Claim
80 words
A band elimination filter including: a resonator (34) having an opening end (341) and a central conductor (35); and a substrate (30) being provided in the vicinity of said opening end (341) of said resonator (34), said substrate (30) essentially comprising a first capacitor electrode4 (32) being electrically connected to said central conductor (35), a second capacitor (31) being paired with said first capacitor electrode (32) and inductor means (33, 36) being electrically connected to said second capacitor electrode (31).
Claim 9
Dependent Claim
27 words
A band elimination filter in accordance with claim 6, wherein said inductor means is an inductor electrode (33) which is integrally formed with said capacitor electrode (31).
Claim 10
Dependent Claim
59 words
A band stop filter for use with a signal carrying line having a series inductance (14), the band stop filter comprising a capacitor (12) in series with a dieletric resonator (11) and being characterised in that only the capacitor (12) and the resonator (11) create a path from the line to earth for signals in the frequency stop band.
Claim 11
Dependent Claim
59 words
A band stop filter for use with a signal carrying line having a series inductance (14), the band stop filter comprising a capacitor (12) in series with a dieletric resonator (11) and being characterised in that only the capacitor (12) and the resonator (11) create a path from the line to earth for signals in the frequency stop band.
References Cited (Backward Citations)
No citation records indexed.
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