Nonreciprocal circuit element

Abstract

A nonreciprocal circuit element includes a first yoke having an upper plate, a second yoke which has a flat lower plate and forms a magnetic closed circuit together with the first yoke, a flat ferrite member arranged between the upper plate and the lower plate, and first, second and third central conductors arranged to partially cross one another in a vertical direction via a dielectric. The dielectric and the central conductors are arranged on a top surface or a bottom surface of the ferrite member. A coil to which a direct current is applied is arranged at an outer circumference of the ferrite member, such that a direct current magnetic field is generated at the ferrite member by means of the coil. As a result, since a typical magnet is not required, a small nonreciprocal circuit element having the small number of components can be implemented at low cost.

Description

technical field [0001] The present invention relates to a non-reciprocal circuit element composed of an isolator or a circulator used in a transmission unit of a mobile communication device such as a mobile phone. Background technique [0002] Figure 5 is an exploded perspective view of a conventional non-reciprocal circuit element, below, based on Figure 5 The structure of the conventional nonreciprocal circuit element will be described. The first yoke 51 composed of a box-shaped magnetic plate (iron plate) is formed in a box shape and has an upper plate 51a and a convex portion 51b provided on the upper plate 51a. A circular magnet 52 is provided in the first yoke 51 . [0003] The second yoke 53 made of a magnetic plate (such as an iron plate) is formed into a box shape, and is combined with the first yoke 51 to form a closed magnetic circuit. [0004] The coil 54 is provided between the upper plate 51 a and the magnet 52 in a state of being arranged on the outer perip...

AI Technical Summary

Problems solved by technology

[0007] However, conventional non-reciprocal circuit elements require a magnet 52 in addition to a coil 54 in order to change the operating frequency, which not only requires a large number of parts and high cost, but also cannot achieve miniaturization.

[0008] Conventional non-reciprocal circuit elements required a magnet 52 in addition to the coil 54 in order to change the operating frequency, which not only required a large number of parts and high cost, but also had the problem of being unable to achieve miniaturization.

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