Nonreciprocal circuit device having a low-pass filter formed on

Details Nonreciprocal circuit device having a low-pass filter formed on Nonreciprocal circuit device having a low-pass filter formed on

1999-03-03

2000-07-11

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Nonreciprocal gyromagnetic type

333 242, H01P 1383

Patent

active

06087905&

ABSTRACT:
A nonreciprocal circuit device which can achieve miniaturization and cost reduction by increasing attenuation outside a passband and greatly decreasing the occurrence of extraneous radiation emissions. The nonreciprocal circuit device comprises: a magnetic circuit comprising a permanent magnet disposed in a yoke; a magnetic member; a magnetic assembly disposed in the magnetic circuit and having a plurality of central conductors disposed on the magnetic member so as to mutually intersect; a plurality of matching capacitors connected respectively between a port of each of the central conductors and a ground terminal; a resin case containing the magnetic assembly and the matching capacitors and having an input/output terminal and said ground terminal; and a spacer for stably supporting at least the magnetic assembly and the matching capacitors in the case; wherein the spacer includes a filter inductor and a filter capacitor; the filter inductor is connected between said port of one of the central conductors and an input/output terminal corresponding to the port; the filter capacitor is connected between said input/output terminal and said ground; whereby a low-pass filter is formed by the filter inductor, the filter capacitor, and the matching capacitor.

REFERENCES:
patent: 3935549 (1976-01-01), Jachowski
patent: 5923224 (1999-07-01), Makino et al.
patent: 6020793 (2000-02-01), Makino et al.
Patent Abstracts Of Japan, vol. 14, No. 222 (3-926), May 10, 1990 & JP 02 055403 A (Murata Mfg. Co. Ltd.), Feb. 23, 1990, abstract.
European Search Report dated Jun. 9, 1999.

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