Nonreciprocal circuit element

Abstract

The present invention relates to an inreversible circuit element which is suitable for miniaturization / thinning and can adjust the attenuation amount, the insertion loss, the working frequency, the 10dB frequency band rate and the required working magnetic field easily and reliably, and furthermore the inreversible circuit element can realiably insure the attenuation outside the frequency band. One end of each of a first central conductor to a third central conductor L1 to L3 is connected on a shared potential P0 to combine with a ferrite 2 for forming a magnetic rotor 1. A first capacitor C1 is connected between the other end P1 of the first central conductor L1 and the other end P2 of a second central conductor L2. A second capacitor C2 is connected between the other end P1 of the first central conductor L1 and the other end P3 of the third central conductor L3. A third capacitor C3 is connected between the other end P2 of the second central conductor and the other end P3 of the third central conductor L3. A fourth capacitor C4 is connected between a sharing potential P0 and an earthing terminal 33. A terminal resistor R is connected between the other end P3 of the third central conductor L3 and one capacitor electrode of the fourth capacitor C4.

Description

technical field [0001] The present invention relates to a non-reciprocal circuit element used as an isolator. Background technique [0002] Such a nonreciprocal circuit element is incorporated in, for example, wireless equipment used in the microwave band, specifically mobile wireless equipment such as mobile phones, in order to separate the two systems functionally in the following circuit configuration so that there is no transmission When the signal affects the receiving system or the received signal affects the transmitting system, the above-mentioned circuit structure is such that the transmitting signal output from the transmitting system is supplied to the antenna, and the receiving signal received by the antenna is guided to the The circuit structure of the receiving system. [0003] This type of nonreciprocal circuit element applies a DC magnetic field from a magnet to a magnetic rotor in which a central conductor is combined with ferrite. A conventionally known t...

AI Technical Summary

Problems solved by technology

[0011] However, the use of the nonreciprocal circuit element described in Patent Document 2 is not suitable for miniaturization and thinning because it is necessary to insert a complex circuit in which capacitors and LC parallel circuits are connected in series between the common node of the central conductor and the ground.

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