Patent ID: 6696901
Filing Date: 2004-02-24
Classification: H01P,H03H

Abstract:
A concentrated-constant, non-reciprocal device comprising:a permanent magnet for applying a DC magnetic field to a ferrimagnetic body; an assembly comprising a plurality of center conductors wound around or at least partly embedded in said ferrimagnetic body, each center conductor having one end as a common terminal and the other end as a first input/output terminal; a plurality of second input/output terminals; a plurality of respective impedance-converting circuits connected to said second input/output terminals and said first input/output terminals; and a plurality of respective load capacitors having a load capacitance connected to said first input/output terminals and a ground conductor, wherein said concentrated-constant, non-reciprocal device is operated at an internal impedance of Zi, wherein said internal impedance Zi is smaller than an external impedance Z0 connected to said second input/output terminals, and wherein a conversion ratio Zi/Z0 in said impedance-converting circuit meets the relation of 0.05&lE;Zi/Z0&lE;0.9 at a center frequency f0 at which said concentrated-constant, non-reciprocal device is operated, wherein each impedance-converting circuit includes an inductance between said first input/output terminals and said second input/output terminals, and an electrostatic capacitance between said second input/output terminals and said ground conductor, said electrostatic capacitance being smaller than said load capacitance, and said inductance being less than an inductance value L1 obtained by the following equation: L1=3979/f0, wherein f0 represents the center frequency in megahertz and L1 represents the inductance value in nanohenry.