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non-reciprocal circuit element

一种电路元件、电容单元的技术，应用在电气元件、电路、波导型器件等方向，能够解决插入损失变大等问题

Active Publication Date: 2016-01-13
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when using this non-reciprocal circuit element, when a high-frequency current is input from the forward direction, since the high-frequency current passes through the above-mentioned first variable matching mechanism, there is a problem that the insertion loss increases anyway.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0052] (for the first embodiment, refer to figure 1 )

[0053] Such as figure 1 As shown, the non-reciprocal circuit element (two-port isolator) of the first embodiment includes a ferrite 32 to which a DC magnetic field is applied by a permanent magnet (not shown), and ferrites 32 arranged to cross each other in a mutually insulated state. The first center electrode 35 ( L1 ) and the second center electrode 36 ( L2 ). One end of the first center electrode 35 is connected to the input port P1, and the other end is connected to the output port P2. One end of the second center electrode 36 is connected to the output port P2, and the other end is connected to the ground port P3. The terminal resistance R and the first central electrode 35 are connected in parallel between the input port P1 and the output port P2, a variable capacitance capacitor C11 is connected between the input port P1 and the output port P2, and a variable capacitance capacitor C11 is connected between the o...

no. 2 Embodiment

[0056] (for the second embodiment, refer to figure 2 )

[0057] Such as figure 2As shown, in the non-reciprocal circuit element (two-port type isolator) of the second embodiment, the terminal resistor R and the first matching capacitor C1 are connected in parallel to the first center electrode 35, and the capacitors CS1 and CA for impedance matching are connected to the input port P1 The capacitor CS2 for impedance matching is connected to the output port P2 side, and the capacitor C12 for adjustment and the switching element S11 for switching on and off of the capacitor C12 are connected in parallel with the first central electrode 35 and the terminal resistor R. . Other configurations are the same as those of the above-mentioned first embodiment. In addition, refer to the following Figure 9 ~ Figure 12 The characteristics of the second embodiment will be described.

[0058] In this non-reciprocal circuit element, when a high-frequency current is input from the output...

no. 3 Embodiment

[0059] (the 3rd embodiment, refer to image 3 )

[0060] Such as image 3 As shown, in the non-reciprocal circuit element (two-port isolator) of the third embodiment, the switching element S11 shown in the above-mentioned second embodiment is constituted as a semiconductor switch S12. The semiconductor switch S12 is a known component of an SPST switch composed of a diode D15, a resistor R15, and a capacitor C15. Other configurations are the same as those of the second embodiment, and the effects are also as described in the second embodiment. In addition, as a switching element, an SPDT switch, a MEMS switch, or the like may be used.

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PUM

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Abstract

A non-reciprocal circuit element capable of adjusting the isolation frequency without deteriorating the insertion loss is obtained. It has a first center electrode (35) and a second center electrode (36) arranged crosswise in an insulated state on a ferrite (32) to which a DC magnetic field is applied through a permanent magnet, and one end of the first center electrode (35) It is connected to the port (P1), and the other end is connected to the port (P2). One end of the second central electrode (36) is connected to the port (P2), and the other end is connected to the port (P3). Between the ports (P1) and (P2), a terminal resistor (R) and a variable capacitance capacitor (C11) are connected in parallel to the first center electrode (35). The isolation frequency can be adjusted by changing the capacitance value of the capacitor (C11).

Description

technical field [0001] The invention relates to non-reciprocal circuit components, in particular to non-reciprocal circuit components such as isolators and circulators used in microwave bands. Background technique [0002] In the past, non-reciprocal circuit components such as isolators and circulators have the characteristic of only transmitting signals in a predetermined specific direction and not transmitting signals in the reverse direction. Due to this characteristic, isolators are not used in transmission circuit sections of mobile communication devices such as car phones and mobile phones. [0003] As such a non-reciprocal circuit element, as described in Patent Document 1, in order to obtain sufficient isolation characteristics in an arbitrary frequency band, a first variable matching mechanism is connected in series to each of a plurality of matching capacitors, and the first variable matching mechanism is connected in series. A non-reciprocal circuit element in wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/36
CPCH01P1/387H01P1/36
Inventor 和田贵也
Owner MURATA MFG CO LTD