Non-reversible cirucit device, non-reversible cirucit and communication device

Abstract

To provide a nonreciprocal circuit device which is compact and capable of obtaining a large attenuation in a specified frequency band without increasing the cost, and provided with at least a built-in inductor for a filter, a nonreciprocal circuit constituted together with the nonreciprocal circuit device, and a communication device using the circuit, central conductors are disposed in a ferrite to which the DC magnetic field is applied in an intersecting manner with each other, matching capacitors are respectively connected between port sections of the central conductors and a ground to constitute a nonreciprocal circuit, a solenoid-shaped inductor is connected between the port section of the central conductor and a signal input / output terminal, and the inductor is disposed in a relationship so that the direction of the magnetic flux which is generated by this inductor and passes through the ferrite is substantially perpendicular to the direction of the DC magnetic field to the ferrite.

Description

Technical field [0001] The present invention relates to a non-reciprocal circuit device, for example, a non-reciprocal circuit composed of an isolator and a circulator used in a high-frequency band including a microwave band and a non-reciprocal circuit, and a communication device using these components. Background technique [0002] So far, non-reciprocal circuit devices, such as lumped constant isolators and lumped constant circulators used in communication devices, have characteristic advantages in that the signal attenuation in the transmission direction is extremely small, and the attenuation in the opposite direction is extremely large. [0003] Figure 7 It is an exploded view of an existing isolator, and Figures 8A and 8B are a top view and a cross-sectional view of its internal structure, respectively. Figure 9 is an equivalent circuit diagram. [0004] Such as Figure 7 , 8A and 8B, the isolator, including the central conductor 51, 52 and 53 and the ferrite 54 of the m...

AI Technical Summary

Problems solved by technology

However, if the size of the solenoid-shaped inductor is reduced, its inductance will also be reduced, and the attenuation of the second and third harmonic components of the fundamental wave will also be reduced.

To reduce the size of a solenoidal inductor without reducing its inductance, the magnetic elements in the resulting solenoidal structure should be properly designed; however, the problem with the newly required magnetic elements in this structure is It is not easy to manufacture, and the cost increases

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