| 摘要 |
PROBLEM TO BE SOLVED: To obtain a nonreciprocal circuit element, configured with a small number of components, having simple structure, stable electrical characteristics, and high reliability, and to obtain its manufacturing method and a communication device. SOLUTION: The nonreciprocal circuit element (two-port isolator) is equipped with a top plate 10, a permanent magnet 41, a ferrite 32, to which a DC magnetic field is applied by the permanent magnet 41, a first and a second center electrode disposed at the ferrite 32, and a circuit board 20. The top plate 10 is formed of a dielectric substance, and a magnetic shielding member 15 is provided on its undersurface. The magnetic shielding member 15 is formed into an annular shape extending along the peripheral surfaces of the permanent magnet 41 and ferrite 32, and a gap of air layer is interposed between the magnetic shielding member 15 and the surface of the circuit board 20. COPYRIGHT: (C)2008,JPO&INPIT
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