JP2002280864A - Power bisecting circuit and power bisecting component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power bisecting circuit and a power bisecting component that can obtain a steep attenuation characteristic and a high isolation characteristic without increasing the insertion loss. SOLUTION: The power bisecting circuit 20 is a known Wilkinson circuit comprising a combination of nonpolar low pass filters (that is, a circuit comprising three capacitors C1-C3, two inductors L1, L2 and a resistor R1) to which capacitors C4, C5 are connected electrically in parallel with the inductors L1, L2. The resonance frequencies of a parallel resonance circuit comprising the inductor L1 and the capacitor C4 and a parallel resonance circuit comprising the inductor L2 and the capacitor C5 are set to frequencies higher than the pass band frequency of the power bisecting circuit 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution circuit and a power distribution component, for example, a power distribution circuit and a power distribution component used in a mobile communication device such as a portable telephone.

[0002]

2. Description of the Related Art A conventional power distribution circuit comprises a non-polar low-pass filter or a non-polar high-pass filter as a basic circuit. For example, a well-known Wilkinson-type power two-distribution circuit includes a non-polar low-pass filter as a basic circuit. FIG. 9 shows an example. The Wilkinson type power two distribution circuit 10 includes three capacitors C1 to C3, two inductors L1 and L2, and one resistor R1. Three capacitors C
The connection point of 1 to C3 is a neutral point and is grounded.

When the power distribution circuit 10 is incorporated in, for example, an RF portion of a mobile phone, the common input / output terminal 1 is connected to a local oscillator, and the input / output terminals 2 and 3 are connected to transmission / reception mixers 1 and 2, respectively. Connected. Then, when a signal output from the local oscillator is input to the common input / output terminal 1, the power is distributed to the signal by approximately 1/2 by the power 2 distribution circuit 10, and the signal is input from the input / output terminals 2 and 3, respectively. Output as S21 and S31.

[0004]

By the way, the conventional power two-distribution circuit includes a non-polar low-pass filter or a non-polar high-pass filter as a basic circuit. In order to obtain a large attenuation characteristic by using the input / output terminals 2
There is a problem that the isolation between the first and third is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power distribution circuit and a power distribution component capable of obtaining steep attenuation and high isolation without substantially changing insertion loss.

[0006]

In order to achieve the above object, a power two distribution circuit according to the present invention is a Wilkinson type power two distribution circuit having a first terminal as a common terminal. A capacitor is electrically connected in parallel to each of the inductor electrically connected between the terminal and the second terminal and the inductor electrically connected between the first terminal and the third terminal. It is characterized by having done.

Alternatively, in the power distribution circuit according to the present invention, a first terminal is used as a common terminal, and two capacitors are electrically connected in series between the first terminal and the second terminal. A series resonance circuit composed of an inductor and a capacitor is electrically connected between an intermediate stub of the capacitor and the ground, and two capacitors are electrically connected in series between the first terminal and the third terminal. And, between the intermediate stub of the two capacitors and the ground, electrically connect a series resonance circuit composed of an inductor and a capacitor,
A resistor is electrically connected between the second terminal and the third terminal.

With the above configuration, an attenuation pole can be formed in the frequency region near the pass band, a steep attenuation characteristic can be obtained with almost no change in insertion loss, and the attenuation between the second terminal and the third terminal can be obtained. Isolation is improved. Furthermore, by forming the power two-distribution circuit having the above-described characteristics in multiple stages, a steeper attenuation characteristic can be obtained.

Further, the power two distribution component according to the present invention is characterized in that the power two distribution circuit having the above-described characteristics is provided in a laminate formed by stacking a plurality of insulator layers.
With the above configuration, a small and low-profile power two-part component can be obtained.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a power distribution circuit and a power distribution component according to the present invention;

First Embodiment, FIGS. 1 to 4 As shown in FIG. 1, a power distribution circuit 20 is a well-known Wilkinson-type circuit (ie, three capacitors) combined with a non-polar low-pass filter. C1 to C3, two inductors L1 and L2, and one resistor R1) in which capacitors C4 and C5 are electrically connected in parallel with the inductors L1 and L2. The connection point of the three capacitors C1 to C3 is a neutral point and is grounded. The common input / output terminal 11 of the power distribution circuit 20 is connected to the input / output terminal 12 via a parallel resonance circuit including an inductor L1 and a capacitor C4 and capacitors C1 and C3. Similarly, the common input / output terminal 11 is connected to the input / output terminal 13 via a parallel resonance circuit including an inductor L2 and a capacitor C5 and capacitors C2 and C3. The resonance frequencies of these parallel resonance circuits are set to frequencies higher than the pass band of the power two distribution circuit 20. A resistor R1 is connected between the input / output terminals 12 and 13.

Next, the operation and effect when the power two distribution circuit 20 is incorporated in the RF portion of a portable telephone will be described. The common input / output terminal 11 is connected to a local oscillator, and the input / output terminals 12 and 13 are connected to transmission / reception mixers 1 and 2, respectively. When a signal output from the local oscillator is input to the common input / output terminal 11, the power is distributed to the signal by approximately half by the power 2 distribution circuit 20, and the signal is input from the input / output terminals 12 and 13, respectively. Output as S21 and S31.

The power two distribution circuit 20 includes an inductor L
1 and a capacitor C4, and a parallel resonance circuit including an inductor L2 and a capacitor C5, so that an attenuation pole is formed in a frequency region on the higher frequency side than the pass band, and the insertion loss is hardly changed. And a steep attenuation characteristic can be obtained. Further, the isolation between the input / output terminals 12 and 13 can be improved.

Next, FIG. 2 is an exploded perspective view of an example of the laminated type power distribution unit 2 having the circuit configuration of FIG. As shown in FIG. 2, the laminated power two-distribution component 20A has the circuit of FIG. 1 provided in a laminated body formed by stacking the insulator sheets 21. The insulator sheet 21 is formed by kneading ceramic dielectric powder or magnetic powder together with a binder or the like to form a sheet. The sheet thickness of each insulator sheet 21 is set to a predetermined dimension.

The capacitor patterns 23 and 24 provided on the surface of the insulator sheet 21 face the capacitor pattern 22 with the insulator sheet 21 interposed therebetween.
1 and C2. Capacitor patterns 25, 2
6, capacitors C4 and C5 are formed facing the capacitor patterns 23 and 24, respectively. The capacitor pattern 28 forms a capacitor C3 with respect to the capacitor pattern 22. The lead pattern 27 is electrically connected to the inductors L1 and L2 formed of a spiral coil conductor pattern via the via hole 30. These capacitor patterns and coil conductor patterns are formed by a method such as a sputtering method, a vapor deposition method, and a printing method, and are made of a material such as Ag-Pd, Ag, Pd, and Cu.

Each of the sheets 21 is stacked and integrally fired to form a laminate 40 as shown in FIG. The input / output terminals 12,
13 and a ground terminal G1 are formed, and a common input / output terminal 11 and ground terminals G2 and G3 are formed on the rear side surface. The terminals 11 to 13 and G1 to G3 are formed by a method such as a sputtering method, an evaporation method, and a coating method.
It is made of a material such as g-Pd, Ag, Pd, Cu, and Cu alloy.

The common input / output terminal 11 is electrically connected to the capacitor patterns 25, 26, 28 and the lead pattern 27. The input / output terminal 12 is electrically connected to the capacitor pattern 23 and the coil conductor pattern of the inductor L1. The input / output terminal 13 is electrically connected to the capacitor pattern 24 and the coil conductor pattern of the inductor L2. The ground terminals G1 to G3 are electrically connected to the capacitor pattern 22.

Further, a resistor R1 for electrically connecting the input / output terminals 12 and 13 is printed on the upper surface of the laminate 40. Note that the resistor R1 may be a chip component. Thus, by forming the circuit of FIG. 1 on the laminate 40, a low-profile and small-sized power two-distribution component 20A can be obtained. In the first embodiment, the resistor R1 is printed after the laminate 40 is formed, but the sheet 21 on which the resistor R1 is printed in advance may be provided on the upper surface and stacked.

FIG. 4 is a graph showing the pass characteristics of the power distribution unit 20A (see the solid lines S21 and S31) and the input / output terminal 12
Between 13 and 13 (see dotted line S23)
FIG.

[Second Embodiment, FIGS. 5 and 6] As shown in FIG. 5, the power two-distribution circuit 50 is a well-known circuit combining a non-polar high-pass filter (ie, four capacitors C11 to C14). And two inductors L11 and L1
2 and one resistor R2), capacitors C15 and C16 are electrically connected in series with the inductors L11 and L12. Capacitor C1
The connection point between 5 and C16 is a neutral point and is grounded.

Two capacitors C11 and C12 are electrically connected in series between the common input / output terminal 11 and the input / output terminal 12. These two capacitors C11 and C11
Between the intermediate stub 12 and ground, an inductor L
11 and a series resonant circuit including the capacitor C15 are electrically connected. Similarly, two capacitors C13 and C1 are connected between the common input / output terminal 11 and the input / output terminal 13.
4 are electrically connected in series. A series resonance circuit including an inductor L12 and a capacitor C16 is electrically connected between an intermediate stub of the two capacitors C13 and C14 and the ground. A resistor R2 is connected between the input / output terminals 12 and 13. The resonance frequencies of these series resonance circuits are set to frequencies lower than the pass band of the power two distribution circuit 50.

The power two distribution circuit 50 includes an inductor L
11 and a capacitor C15, and a series resonance circuit including the inductor L12 and the capacitor C16, an attenuation pole is formed in a frequency region lower than the pass band, and the insertion loss is hardly changed. And a steep attenuation characteristic can be obtained. Further, the isolation between the input / output terminals 12 and 13 can be improved. FIG. 6 shows the pass characteristics (see the solid lines S21 and S31) of the power distribution component having the circuit of FIG. 5 and the isolation characteristics between the input / output terminals 12 and 13 (the dotted line S2).
3).

[Third and Fourth Embodiments, FIGS. 7 and 8]
A power two distribution circuit 60 according to the third embodiment shown in FIG. 7 has a multistage configuration of the power two distribution circuit 20 according to the first embodiment. The power two distribution circuit 70 of the fourth embodiment shown in FIG. 8 has a multistage configuration of the power two distribution circuit 50 of the second embodiment. As a result, power distribution circuits 60 and 70 having more steep attenuation characteristics can be obtained.

[Other Embodiments] The power two distribution circuit and the power two distribution component according to the present invention are not limited to the above embodiment, but can be variously modified within the scope of the gist. For example, the shape of the inductor pattern is arbitrary, and may be a meandering shape, a linear shape, or the like in addition to the spiral shape.

In the above embodiment, the case of individual products has been described as an example. However, in the case of mass production, a mother board provided with a plurality of power distribution parts for a plurality of pieces is manufactured and cut into a desired size. Products. Further, in the above embodiment, the insulator sheets on which the conductors are formed are stacked and then integrally fired, but the invention is not necessarily limited to this. The sheet which has been baked in advance may be used. Further, the power distribution unit may be manufactured by a manufacturing method described below.
After a paste-like insulator material is applied by printing or the like to form an insulator layer, an arbitrary conductor is formed by applying a paste-like conductor material to the surface of the insulator layer. Next, a paste-like insulator material is applied over the conductor. In this way, the power 2 distribution component having the laminated structure can be obtained by successively coating.

Although the capacitor and the inductor are built in the laminate in the above embodiment, a part of the capacitor or the inductor may be mounted on the surface of the laminate or externally attached instead of a chip component. Good.

[0027]

As is clear from the above description, according to the present invention, since a parallel resonance circuit comprising an inductor and a capacitor or a series resonance circuit is provided, the attenuation pole is located in the frequency region near the pass band. Can be formed, a steep attenuation characteristic can be obtained without substantially changing the insertion loss, and the isolation between the second terminal and the third terminal can be improved. Further, by forming the power two-distribution circuit having the above-described characteristics in multiple stages, it is possible to obtain a steeper attenuation characteristic.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing a first embodiment of a power two distribution circuit according to the present invention.

FIG. 2 is an exploded perspective view of a multilayer power distribution unit having the circuit configuration of FIG. 1;

FIG. 3 is an external perspective view of the stacked power 2 distribution component shown in FIG. 2;

FIG. 4 is a graph showing pass characteristics and isolation characteristics of the multilayer power two-part distribution component shown in FIG. 3;

FIG. 5 is an electric circuit diagram showing a second embodiment of the power distribution circuit according to the present invention.

FIG. 6 is a graph showing pass characteristics and isolation characteristics of a power distribution unit having the circuit shown in FIG. 5;

FIG. 7 is an electric circuit diagram showing a third embodiment of the power distribution circuit according to the present invention.

FIG. 8 is an electric circuit diagram showing a fourth embodiment of the power two distribution circuit according to the present invention.

FIG. 9 is an electric circuit diagram showing a conventional power distribution circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Common input / output terminal 12, 13 ... Input / output terminal 20, 50, 60, 70 ... Power 2 distribution circuit 20A ... Power 2 distribution part 21 ... Insulator sheet 22-26, 28 ... Capacitor pattern 40 ... Laminate C1 C5, C11 to C16: capacitors L1, L2, L11, L12: inductors R1, R2: resistors

Claims (6)

[Claims] 1. A Wilkinson-type power distribution circuit having a first terminal as a common terminal, an inductor electrically connected between the first terminal and the second terminal, and an inductor electrically connected between the first terminal and the second terminal. A power two distribution circuit, wherein a capacitor is electrically connected in parallel to each of the inductors electrically connected to the three terminals. 2. A method according to claim 1, wherein the first terminal is a common terminal, two capacitors are electrically connected in series between the first terminal and the second terminal, and an intermediate stub of the two capacitors is connected to the ground. Electrically connecting a series resonance circuit composed of an inductor and a capacitor, electrically connecting two capacitors in series between the first terminal and the third terminal, and an intermediate stub between the two capacitors. A power two distribution circuit, wherein a series resonance circuit composed of an inductor and a capacitor is electrically connected to a ground, and a resistor is electrically connected between the second terminal and the third terminal. 3. A power two distribution circuit, wherein the power two distribution circuit according to claim 1 is configured in multiple stages. 4. A power 2 distribution component, wherein the power 2 distribution circuit according to claim 1 is provided in a laminate formed by stacking a plurality of insulator layers. 5. An insulator layer on which first and second coil conductor patterns constituting an inductor between a first terminal and a second terminal and an inductor between the first terminal and a third terminal, respectively, are formed. An insulator layer formed with first and second capacitor patterns connected to one end of each of the first and second coil conductor patterns; and an insulator layer formed on the other end of each of the first and second coil conductor patterns. An insulator layer on which third and fourth capacitor patterns are formed, which are respectively connected to the first and second capacitor patterns, and which face the third and fourth capacitor patterns, and
An insulator layer on which a grounded ground pattern is formed; a fifth capacitor facing the ground pattern and connected to one ends of the first and second coil conductor patterns and the first and second capacitor patterns; 5. The power distribution device according to claim 4, further comprising: a stacked body formed by stacking a patterned insulator layer and: 6. A method according to claim 1, wherein the first and second layers are provided on a surface of the laminate.
The power two-distribution component according to claim 5, wherein a resistor that connects between the other ends of the coil conductor pattern is formed.