Wave transmission lines and networks – Plural channel systems – Nonreciprocal gyromagnetic type
Patent
1996-11-26
1999-04-27
Eisenzopf, Reinhard J.
Wave transmission lines and networks
Plural channel systems
Nonreciprocal gyromagnetic type
333 241, H01P 132
Patent
active
058983465
ABSTRACT:
A dual-band nonreversible circuit device comprises a first circulator element (91) and a second circulator element (92) accommodated in a single housing (50, 50', 60) and operable around a first center frequency (f.sub.A) and a second center frequency (f.sub.B), respectively. The first circulator element (91) is formed by a combination of a first permanent magnet (31), a first ferrite plate (21) with a first center conductor (11), and a ground conductor plate (40) successively stacked on a lower magnetic yoke (50). Likewise, the second circulator element (92) is formed by a combination of the ground conductor plate (40), a second ferrite plate (22) with a second center conductor (12), and a second permanent magnet (32) successively stacked and covered by an upper magnetic yoke (60). Alternatively, a first circulator element (91') is formed by a combination of a first ground conductor plate (41), the first ferrite plate (21) with the first center conductor (11), and a permanent magnet (30) while the second circulator element (92') is formed by a combination of a second ground conductor plate (42), the second ferrite plate (22) with the second center conductor (12), and the permanent magnet (30).
REFERENCES:
patent: 3614675 (1971-10-01), Kunishi
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patent: 5185587 (1993-02-01), Kurian et al.
patent: 5379004 (1995-01-01), Marusawa et al.
patent: 5662754 (1997-09-01), Marusawa et al.
Furuta Atsushi
Kamei Koji
Ono Norihiko
Takamoro Kenji
Yoshida Shigeyoshi
Aoki Makoto
Eisenzopf Reinhard J.
NEC Corporation
Tokin Corporation
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