Other

Nec Corporation

Tokin Corporation

Atsushi Furuta

Shigeyoshi Yoshida

Koji Kamei

Norihiko Ono

Kenji Takamoro

Akihiro Isomura

Jae-Ho Hwang

A dielectric resonator ( ) having three surfaces formed by chamfering three ridged portions sharing an apex of a dielectric block and another three surfaces adjacent respectively thereto, in which each of the chamfered surfaces and the adjacent surfaces thereto offers an angle of 45 degrees and an area ratio of the chamfered surfaces with respect to the adjacent surfaces is 45% is mounted in a cut-off waveguide of a generally rectangular parallelopiped ( ) and feeding probe ( ) and ( ) are provided for composing a dielectric filter.

Dielectric resonator and dielectric filter

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).

Dual-band nonreversible circuit device comprising two nonreversible

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Sendai, Japan

Atsushi Furuta