Murata Manufacturing Co., Ltd.

Yasuhiro Takahashi

Koji Furutani

Takatoshi Kato

Yoshiyuki Ishiyama

In a circuit module in which a plurality of non-reciprocal circuit elements, each of which does not have a yoke, are mounted, the occurrence of magnetic coupling between the non-reciprocal circuit elements is significantly reduced and prevented. Core isolators are not arranged such that, in a state in which the direction of magnetic flux and the direction of magnetic flux are the same, the core isolators are aligned in the direction of the magnetic flux. Specifically, the core isolators generate the magnetic flux from left to right. The core isolators are aligned so as to be inclined relative to the magnetic flux. Thus, extension of the magnetic flux through the core isolator in a state of being directed in the same direction as that of the magnetic flux is significantly reduced and prevented.

Circuit module

An electronic component includes a component body including a mounting surface facing a circuit substrate, and a plurality of first external electrodes arranged on the mounting surface so as to extend between a first side and a second side of the mounting surface substantially parallel with each other and so as to be within a first region having a width that is substantially equal to half a length of the first side in a direction in which the first side extends. A circuit substrate includes a substrate body, a plurality of second external electrodes, arranged on a main surface of the substrate body, respectively connected to the plurality of the first external electrodes, and support units arranged to protrude from the main surface of the substrate body and such that the electronic component overlaps the support units outside the first region.

An electronic component is mounted on a substrate so as to be in contact with a non-reciprocal circuit element. Therefore, there is no risk of the electronic component, which is arranged so as to be in contact with the non-reciprocal circuit element, being displaced as a result of being shifted by the magnetic force of permanent magnets included in the non-reciprocal circuit element and displacement of the electronic component as a result of being shifted by the magnetic force of the permanent magnets can be prevented. Therefore, since there is no risk of the electronic component being displaced by being shifted by the magnetic force of the permanent magnets, a space in which to mount a member that would function as an electromagnetic shield, such as a yoke, need not be provided on the substrate and the composite electronic module can be reduced in size and profile.

Composite electronic module and method of manufacturing composite electronic module

An isolator includes a core isolator mounted on a circuit board and including a ferrite and permanent magnets to apply a direct-current magnetic field to the ferrite, and includes no yoke for controlling the leakage of the direct-current magnetic field out of the isolator. Power amplifiers are arranged in a straight line along with the core isolator interposed therebetween. A metal case covers the core isolator and the power amplifiers. The heights of the power amplifiers are greater than that of the core isolator.

In a circuit module, a core isolator includes a ferrite and a permanent magnet that is arranged to apply a direct-current field to the ferrite. A switch outputs to a signal path a high-frequency signal outputted from the core isolator. A SAW filter is provided on the signal path. A matching circuit is provided on the signal path and provides impedance matching between the output impedance of the core isolator and the input impedance of the SAW filter.

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Nagaokakyo, Japan

Yasuhiro Takahashi