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Non-reciprocal circuit device

A technology of circuit components and inductance components, which is applied in the field of non-reciprocal circuit components, and can solve the problems of degraded insertion loss characteristics and isolation characteristics, impedance mismatch, input impedance expected value deviation, etc.

Active Publication Date: 2006-01-11
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this happens, the input impedance of the 2-terminal pair isolator will deviate from the expected value, resulting in an impedance mismatch with other circuits connected to the 2-terminal pair isolator, deteriorating insertion loss characteristics and isolation characteristics
[0013] Although it is possible to determine the inductance and capacitance constituting the first and second parallel resonant circuits by taking unnecessary reactance components into consideration, it is not possible to obtain The best matching condition with the external circuit
This is because the first and second central conductors 21, 22 are coupled to each other, and the inductances of the first and second inductance elements L1, L2 change simultaneously, making it difficult to independently adjust the input impedances of the first and second input and output ports P2, P1. reason
In particular, since the deviation of the input impedance of the first input and output port P1 will cause an increase in insertion loss, it must be prevented

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0052] (Example 1, Comparative Example 1)

[0053] Figure 6 is an equivalent circuit of a nonreciprocal circuit element of an embodiment of the present invention. In this embodiment, the impedance adjustment mechanism 90 is composed of a capacitive element Cz bypass-connected between the first input / output port P1 and the first inductance element L1 (refer to image 3 (a)). other circuit configuration, due to the figure 1 The shown equivalent circuits are the same, and therefore explanations are omitted.

[0054] Figure 7 is a perspective view showing the appearance of a nonreciprocal circuit element according to an embodiment of the present invention, Figure 8 is its exploded perspective view. The nonreciprocal circuit element 1 includes: a microwave ferrite 10 and a center conductor 20 arranged to surround the microwave ferrite 10 (having a first center conductor 21 and a first center conductor 21 intersecting each other on the microwave ferrite 10 in an electrical...

Embodiment 2

[0091] Figure 18 An equivalent circuit of a nonreciprocal circuit element according to yet another embodiment of the present invention is shown. The difference from the first embodiment is that the impedance adjustment mechanism 90 is constituted by a capacitive element Cz and an inductance element Lz1 connected in series between the first input / output port P1 and the port PT. Inductive element Lz1, is for example Figure 19 In the distributed constant line formed by the electrode pattern 512 formed on the dielectric thin plate S6. Figure 20 is the S when the inductance element Lz1 is not connected to the non-reciprocal circuit element of embodiment 2 11 Smith Chart, Figure 21 is the S of Example 2 11 Smith chart. in S 11 In the Smith chart, marks 1 to 3 represent 835MHz, 1.68GHz, and 2.52GHz, respectively. By connecting the inductance element Lz1, the phase θ of the high harmonic component (1.68GHz: double wave, 2.52GHz: triple wave) can be shifted without substanti...

Embodiment 3

[0093] Fig. 22 shows an equivalent circuit of a nonreciprocal circuit element according to still another embodiment of the present invention. The difference from the first embodiment is that a parallel resonant circuit of an inductance element LW and a capacitance element CW is connected between the port PE and the ground. The non-reciprocal circuit element can widen the passband more than non-reciprocal circuit elements with other structures.

[0094] Figure 23 In the example shown, in order to reduce the size of the nonreciprocal circuit element without increasing the number of mounted components, the inductance element LW is formed of a distributed constant line formed by electrode patterns 513 formed on the dielectric sheet S7, and the capacitance element CW is formed of a The electrode pattern 510 on the dielectric sheet S6 and the electrode pattern GND on the back surface are formed, and they are all embedded in the laminated substrate. Furthermore, the inductance ele...

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Abstract

The present invention provides a non-reciprocal circuit device comprising a first inductance element disposed between a first input / output port and a second input / output port, a second inductance element disposed between the second input / output port and a ground, a first capacitance element constituting a first parallel resonance circuit with the first inductance element, a second capacitance element constituting a second parallel resonance circuit with the second inductance element, a resistance element parallel-connected to the first parallel resonance circuit, and an impedance-adjusting means disposed between the first input / output port and the first inductance element.

Description

technical field [0001] The present invention relates to a nonreciprocal circuit element having irreversible transmission characteristics for high-frequency signals, and in particular to a nonreciprocal circuit element generally called an isolator used in mobile communication systems such as mobile phones. Background technique [0002] Nonreciprocal circuit elements such as isolators are often used in mobile communication equipment using frequency bands ranging from hundreds of MHz to tens of GHz, ie, mobile phones and base stations thereof. An isolator is arranged, for example, between a power amplifier and an antenna in a transmission stage of a mobile communication device, and prevents backflow of unnecessary signals to the power amplifier and stabilizes impedance on the load side of the power amplifier. Therefore, an isolator is required to have excellent insertion loss characteristics, reflection loss characteristics, and isolation characteristics. [0003] Figure 27 I...

Claims

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Application Information

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IPC IPC(8): H01P1/36
Inventor 岸本靖寺胁武文野津稔
Owner HITACHI METALS LTD