| 摘要 |
There is provided a non-reciprocal circuit element which has a simple structure and superiority in assembly and allows easy achievement of height reduction and size reduction while preventing fracture of a ferrite plate. In the present invention, a central conductor 1 in which respective resonators 3 extending outward are formed between I/O terminals 2a to 2c extending outward in a Y-shape from a central portion, upper and lower ferrite plates 5 and 6 between which the central conductor 1 together with the resonators 3 is sandwiched, and upper and lower magnetic metal plates 7 and 8 between which the upper and lower ferrite plates are sandwiched are stacked, a magnet 10 is arranged on the upper magnetic metal plate 7, and bent portions 4 which are bent in out-of-plane directions and form an interstice G between the central conductor 1 and the upper ferrite plate 5 are formed at respective distal end portions 3a of the resonators 3 of the central conductor 1 such that the upper ferrite plate 5 is provided to be capable of coming into and out of contact with the central conductor 1 due to the elasticity of the bent portions 4. The prevent invention also provides a non-reciprocal circuit element which can obtain good circulator characteristics without excessively increasing the magnetic field strength of a magnet and can be used in a wide band including a high frequency band in particular. To this end, in a non-reciprocal circuit element in which the I/O terminals 2a to 2c are integrally formed, and the upper and lower magnetic metal plates 7 and 8 form a closed magnetic circuit via side plates 9, the upper magnetic metal plate 7 is formed of a material having magnetic permeability lower than that of pure iron and/or is formed to have a thickness t smaller than a thickness T of the lower magnetic metal plate 8.
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