Irreversible circuit element

Abstract

To provide a nonreciprocal circuit element which is small and has excellent performance. In this nonreciprocal circuit element, first, second, third center conductors 6, 7, 8 are provided in a multilayer substrate 5, first and second electrodes 14 and 15 forming a first capacitor C4 are provided in the multilayer substrate 5, a plurality of chip capacitors C1, C2, C3 are provided between port sections 6a, 7a, 8a of the center conductors 6, 7, 8 and a yoke 3, and the first capacitor C4 and chip type capacitors C1, C2, C3 are connected in series between the port sections 6a, 7a, 8a and the yoke 3. With this configuration, capacitance value can be made large, the length of each of the center conductors can be shortened and miniaturization can be realized, the first capacitor C4 can be easily formed, and an inexpensive element having good productivity can be obtained.

Description

technical field [0001] The present invention relates to a non-reciprocal circuit element composed of an isolator or a circulator suitable for an antenna duplexer or a mobile communication device. Background technique [0002] Figure 14 is an exploded perspective view showing a conventional non-reciprocal circuit element, Figure 15 is a cross-sectional view showing a main part of a conventional nonreciprocal circuit element, and then, based on Figure 14 , Figure 15 The structure of the conventional non-reciprocal circuit element will be described. A box-shaped first yoke 51 and a U-shaped second yoke 52 are coupled to each other to form a closed magnetic circuit. [0003] The insulating substrate 53 accommodated in the second yoke 52 is provided with a circular hole 53a provided in the center and a plurality of rectangular holes 53b provided in the outer periphery of the circular hole 53a. There are a plurality of ground patterns 54 , and the ground patterns 54 are conn...

AI Technical Summary

Problems solved by technology

[0007] However, since the conventional non-reciprocal circuit elements only use the first, second, and third chip capacitors C1, C2, and C3, it is necessary to make the first, second, and third central conductors 57, 58, and 59 longer. , or increase the capacitance values ​​of the first, second, and third chip-type capacitors C1, C2, and C3, which will not only increase the size but also make it impossible to adjust the coupling capacitance, resulting in a decrease in performance

[0008] Conventional non-reciprocal circuit elements only use the first, second, and third chip capacitors C1, C2, and C3, so it is necessary to make the first, second, and third center conductors 57, 58, and 59 longer, or Increasing the capacitance of the first, second, and third chip capacitors C1, C2, and C3 not only increases the size, but also makes it impossible to adjust the coupling capacitance, resulting in a problem of performance degradation

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