Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
2006-12-12
2006-12-12
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
C333S185000
Reexamination Certificate
active
07148768
ABSTRACT:
A filter element includes a coil part formed in an overall tube-like shape by layering a signal transmitting belt-like conductor and a grounding belt-like conductor with a belt-like insulator in between and winding so that the grounding belt-like conductor is outside the signal transmitting belt-like conductor, a magnetic body being attached to a center of the coil part; an input terminal that is connected to an outermost circumferential part of the signal transmitting belt-like conductor and is led from an outer circumferential position of the coil part; an output terminal that is connected to an innermost circumferential part of the signal transmitting belt-like conductor and is led from a central position of the coil part located on an opposite side to a leading position of the input terminal with the magnetic body in between; and a grounding terminal that is connected to an outermost circumferential part of the grounding belt-like conductor and is led from an outer circumferential position of the coil part located on an opposite side to a leading position of the input terminal with a leading position of the output terminal in between. In this way, a filter element with superior attenuation characteristics is realized.
REFERENCES:
patent: 4945322 (1990-07-01), Okumura
patent: 5030933 (1991-07-01), Ikeda
patent: 5040094 (1991-08-01), Okumura
patent: 5153812 (1992-10-01), Naito
patent: 63-174416 (1988-07-01), None
patent: 02-026114 (1990-01-01), None
patent: 02-026115 (1990-01-01), None
patent: 28263208 (1998-09-01), None
English Language Abstract of JP 63-174416.
English Language Abstract of JP 02-026114.
English Language Abstract of JP 02-026115.
Yanagisawa Koichi
Zhang Fuchun
Greenblum & Bernstein P.L.C.
Ham Seungsook
Hioki Denki Kabushiki Kaisha
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