JPH0738368A - 180× phase shifter - Google Patents

Abstract

PURPOSE:To make a 180 deg. phase shifter into miniaturization and SMD and to improve mass-productivity. CONSTITUTION:The 180 deg. phase shifter is provided with one primary side coil 2 and two secondary side coils 3, 4 and the primary and secondary coils are comprised setting a transformer in which a connection point is grounded by connecting the secondary side coils in series as a transformer part set with plural coil patterns on a multi-layer substrate, and also, a capacitor part set with a GND electrode pattern 14 and plural capacitor electrode patterns is provided, and it is unified with the transformer part, and capacitors C1, C2, and C3 ground-connected to the capacitor part are connected to the primary side coil 2 and the secondary side coils 3, 4, respectively. Also, the capacitor part is divided into two parts, and a first capacitor part and a second capacitor part are symmetrically arranged at both sides of the trnasformer part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, in wireless devices such as mobile phones and various other communication devices.
Regarding 0 ° phase shifter, especially when using a multilayer substrate, SMD
(Surface mount component) 180 ° phase shifter

[0002]

2. Description of the Related Art FIGS. 10 and 11 are views showing conventional examples. In FIGS. 10 and 11, 1 is a toroidal core (ferrite), 2 is a primary coil (primary winding), 3 4 is a secondary coil (secondary winding), IN is an input terminal, OUT1, O
UT2 indicates an output terminal.

§1: Description of 180 ° phase shifter ... FIG. 10
Reference FIG. 10 is an explanatory view of a conventional 180 ° phase shifter, where A is 1
A perspective view of the 80 ° phase shifter, and B is its equivalent circuit.

Various types of 180 ° phase shifters have heretofore been known. One of them is shown in FIG. This example
It is an example of a 180 ° phase shifter using a transformer. As shown in the figure, a toroidal core (ferrite) 1 is wound around a transformer with a primary coil (primary winding) 2 and two secondary coils (secondary windings) 3 and 4 wound around it. And

Then, as shown in the equivalent circuit of FIG. 10B, one end of the primary coil 2 is grounded and the non-grounded side is the input terminal IN. Further, the secondary coils 3 and 4 are connected in series, the connection point is grounded, and the non-grounded sides are output terminals OUT1 and OUT2 (two output terminals), respectively.

In the 180 ° phase shifter having such a configuration, when a signal is input to the input terminal IN, signals having different phases of 180 ° are output from the two output terminals OUT1 and OUT2.

§2: Description of characteristics of 180 ° phase shifter
See FIG. 11. FIG. 11 is a diagram showing a characteristic example of the 180 ° phase shifter. In FIG. 11, the horizontal axis represents the coupling coefficient K between the primary side coil 2 and the secondary side coil 3, and the vertical axis represents the signal transmission amount (d
B) and the amount of reflection (dB) are shown.

The reflection amount is a signal amount reflected on the input side of the 180 ° phase shifter, and the transmission amount is an amount transmitted from the input side to the output side of the 180 ° phase shifter. In this case, if the transmission amount is large, the insertion loss amount inside is small, and conversely, if the transmission amount is small, the insertion loss amount is large.

[0009] For example, characteristic example of FIG. 11, 1.6GH _Z
Regarding the 180 ° phase shifter in the band, when K is about 1.0, the reflection amount is the minimum value (about −8 dB to −9 dB) and the transmission amount is the maximum value (−3 dB to −4 dB). Degree). In this case, since the transmission amount is the maximum, the insertion loss amount has the minimum value.

[0010]

SUMMARY OF THE INVENTION The above-mentioned conventional devices have the following problems. : In recent years, along with downsizing of equipment, downsizing of 180 ° phase shifter has been required. However, the conventional 180 ° phase shifter using a transformer has a limit to miniaturization.

[0011]: The 180 ° phase shifter is downsized and
In order to facilitate the mounting, there is also a demand for SMD (surface mount component), but it is difficult to realize SMD in a conventional 180 ° phase shifter using a transformer.

When manufacturing a 180 ° phase shifter, a conventional 180 ° phase shifter using a transformer requires winding work, and mass productivity is poor. : In the high frequency band, it is necessary to process the toroidal core of ferrite small, but it is difficult to process ferrite. Further, in this case, since the winding work is performed on the small toroidal core, the manufacturing is difficult.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem and to make a 180 ° phase shifter compact, SMD, and improve mass productivity.

[0014]

FIG. 1 is a diagram for explaining the principle of the present invention. A is an equivalent circuit, B is a sectional view of a 180 ° phase shifter (No. 1), and C is a sectional view of a 180 ° phase shifter. It is a figure (the 2). In FIG. 1, the same components as those in FIGS. 10 and 11 are designated by the same reference numerals. Further, 14 and 31 are GND electrode patterns, and C1, C2 and C3 are capacitors.

In order to solve the above problems, the present invention has the following configuration. : 1 primary coil 2 and 2 secondary coils 3,
4 is a 180 ° phase shifter using a transformer in which the secondary side coils 3 and 4 are connected in series and the connection point is grounded, and the 180 ° phase shifter is composed of a multilayer substrate. , A plurality of coil patterns are set on this multilayer substrate to form a transformer unit, and the transformer unit uses the primary side and secondary side coils 2
4 to 4, the GND electrode pattern and a plurality of capacitor electrode patterns are set on the multilayer substrate to form a capacitor part, and the capacitor part is integrated with the transformer part to form the primary side coils 2 and 2 180 connected to each of the secondary coils 3 and 4 are the capacitors C1, C2, and C3 of the capacitor unit with one electrode grounded.
° Phase shifter.

: In the configuration, the GN of the capacitor section
The D electrode pattern 14 was set as a solid pattern (a pattern formed on substantially the entire surface of the substrate) at the position which is the lowermost pattern (component mounting surface side) of the multilayer substrate 18
0 ° phase shifter.

In the structure, the capacitor section is divided into two to form a first capacitor section and a second capacitor section, and the first capacitor section and the second capacitor section are provided on both sides of the transformer section in the stacking direction of the multilayer substrate. A 180 ° phase shifter with two capacitor sections arranged symmetrically.

In the configuration, the GND electrode patterns 14 and 31 of the first and second capacitor portions are formed on the uppermost side (opposite side of the component mounting surface) and the lowermost side (component mounting surface side) of the multilayer substrate. Set as a solid pattern (pattern formed on almost the entire surface of the substrate) at
A 180 ° phase shifter in which both sides of the transformer section and the capacitor section in the stacking direction are sandwiched between the two GND electrode patterns 14 and 31.

[0019]

The operation of the present invention based on the above configuration will be described with reference to FIG. When a signal is input to the input terminal IN of the 180 ° phase shifter having the transformer section and the capacitor section set on the multilayer substrate, a current flows through the primary coil 2 (coil pattern of the transformer section).

The function as a transformer causes 2
A voltage is generated in the secondary coils 3 and 4 (coil pattern of the transformer section), and the two output terminals OUT1 and OUT2
A signal with a 180 ° phase difference is output.

In this case, capacitors C1, C2, C3 (each capacitor of the capacitor section) whose one electrode is grounded are added to both the primary side coil and the secondary side coil (coil pattern) of the transformer section. With such a configuration, a resonance phenomenon occurs, so that a 180 ° phase shifter with excellent characteristics can be realized even if the coupling coefficient is lowered.

Further, by using the multi-layer substrate as described above, the 180 ° phase shifter can be downsized and SMD
In addition, mass productivity can be improved. Further, if the capacitors of the first capacitor section and the second capacitor section are symmetrically arranged in the up-down direction of the substrate around the coil pattern forming the primary coil, it is possible to perform fine adjustment of each pattern. It is possible to reduce the level deviation between the output terminals OUT1 and OUT2. Therefore, the product development period can be shortened.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. (Description of First Embodiment) FIGS. 2 to 7 are views showing a first embodiment of the present invention. In FIGS. 2 to 7, the same parts as those in FIGS. 1, 10 and 11 are the same. It is indicated by a symbol.

7-1 to 7-7 are first to seventh layers (dielectric layers) of the multilayer substrate, and 8 and 10 are coil patterns (2
Secondary coil), 9 is a coil pattern (primary coil),
11 to 13 are capacitor electrode patterns, 14 is a GND electrode pattern, 16 is a relay pad, and 17 to 22 are external electrodes (external terminals).

§1: Description by equivalent circuit--see FIG. 2 FIG. 2 is an equivalent circuit of a 180 ° phase shifter. First, a basic description of the 180 ° phase shifter of the present embodiment will be given based on the equivalent circuit of FIG.

As the 180 ° phase shifter, the one using a transformer is generally used as in the conventional example. 180 ° phase shifter, primary side for high frequency, 2
On the secondary side, the self-inductance of the coil itself is not so large, but the coupling coefficient K between the primary side and the secondary side is
About, you need to some extent.

Therefore, conventionally, it has been necessary to make ferrite into a toroidal shape and finish it as a transformer. Therefore, even if the coil forming the transformer of the conventional example is formed in a thick film pattern on each layer of the multi-layer substrate, the required coupling coefficient K cannot be obtained, and a 180 ° phase shifter with desired characteristics is realized. It was difficult to do.

In this case, both the primary side and the secondary side depend on the self-inductance of each coil, but even if the coils are simply stacked on the multilayer substrate, the coupling coefficient K is only about K = 0.5. I can't get it. Therefore, on the secondary side, two outputs with a 180 ° phase difference can be obtained, but the insertion loss becomes large.

Therefore, the use of the resonance phenomenon was considered in order to transmit the signal to the secondary side. That is, as shown in the equivalent circuit of FIG. 2, capacitors C1, C2, C3 (for grounding) are grounded at one electrode of both of the primary side coil 2, the secondary side coils 3 and 4 which compose the transformer. Capacitor) was added.

In this way, a 180 ° phase shifter with good characteristics can be realized even if the coupling coefficient K is lowered. The conventional 180 ° phase shifter has an advantage that it can be designed in a relatively wide band. On the other hand, the 180 ° phase shifter of this embodiment is not very suitable as a wideband 180 ° phase shifter, but for a specific frequency, the reflection characteristic of the primary side input is improved and the insertion loss is reduced. The characteristic is that a 180 ° phase shifter with excellent characteristics can be realized.

§2: Description of 180 ° phase shifter ... FIG.
4 and 5, FIG. 3 is an exploded perspective view of the 180 ° phase shifter of the first embodiment, FIG. 4 is an explanatory view of each part of FIG. 3, and FIG. 5 is a completed 180 ° phase shifter of the first embodiment (A Is a perspective view and B is a cross-sectional view taken along line XY). Hereinafter, based on FIG. 3, FIG. 4, and FIG.
° Describe the phase shifter.

The first embodiment is an example in which a 180 ° phase shifter is realized by a multi-layer substrate in which a plurality of dielectric layers are laminated. As shown in FIG. 3, the multi-layer substrate is the first layer 7-1. ~ The seventh layer 7-7 (dielectric layer).

No patterning is performed on the first layer 7-1 constituting the multilayer substrate. This layer is used as a protective layer. Second layer 7-2, third layer 7-3, and fourth layer 7-4
Are the layers that make up the transformer section.
A coil pattern (thick film pattern) is formed by printing a conductor paste or the like.

That is, the coil pattern 8 is formed on the second layer 7-2, and the coil pattern 9 is formed on the third layer 7-3.
And the coil pattern 10 is formed on the fourth layer 7-4. The relay pad 16 is also formed on the third layer 7-3.

The fifth layer 7-5 is a spacer layer (dummy layer).
And no patterning is done. A sixth layer 7-6,
The seventh layer 7-7 is a layer forming a capacitor portion, and a capacitor electrode pattern (thick film pattern) and a GND electrode pattern (thick film pattern) are formed on each layer by printing a conductor paste or the like.

In this case, the sixth layer 7-6 has the capacitor electrode pattern 1 forming the hot-side capacitor electrode.
1, 12, 13 are formed, and a GND electrode pattern 14 that constitutes a GND-side capacitor electrode is formed on the seventh layer 7-7.
Is formed as a solid pattern (a pattern obtained by patterning substantially the entire surface of the substrate).

Hereinafter, each of the patterns will be described in detail with reference to FIG. : The coil pattern 8 formed on the second layer 7-2 is a pattern forming the secondary coil 3 of the transformer section. The point P1 at one end of the coil pattern 8 is the output terminal OUT.
1 and the P2 point at the other end is connected to GND.

The coil pattern 9 formed on the third layer 7-3 constitutes the primary coil 2 of the transformer section. A point P3 at one end of the coil pattern 9 is connected to the input terminal IN, and a point P4 at the other end is connected to GND.

The coil pattern 10 formed on the fourth layer 7-4 constitutes the secondary coil 4 of the transformer section. The point P5 at one end of the coil pattern 10 is the output terminal OU.
It is connected to T2, and the P6 point at the other end is connected to GND.

Then, as shown, the coil pattern 8 of the second layer 7-2 and the coil pattern 10 of the fourth layer 7-4.
Are connected to each other by a via (via hole) at a position indicated by a dotted line in the drawing through the relay pad 16 formed on the third layer 7-3 (the connection point of the two secondary coils is grounded).

The sixth layer 7-6 and the seventh layer 7-7 of the capacitor section are as follows. The capacitor electrode patterns 11, 12, 13 formed on the sixth layer 7-6 and the seventh layer 7-
Capacitors C1, C2, and C3 are formed between the GND electrode patterns 14 formed in 7.

In this case, the capacitor C1 is formed between the capacitor electrode pattern 11 and the GND electrode pattern 14, the capacitor C2 is formed between the capacitor electrode pattern 12 and the GND electrode pattern 14, and the capacitor electrode pattern 13 is formed. Between the GND electrode pattern 14 and
It constitutes a capacitor C3.

In the capacitor section, the point P7 formed at one end of the capacitor electrode pattern 11 is connected to the point P3 (IN), and the point P8 formed at one end of the capacitor electrode pattern 12 is connected to the point P1 (OUT1). The point P9 formed at one end of the capacitor electrode pattern 13 is connected to the point P5 (OUT2).

All the points P10, P11, P12 formed at the end of the GND electrode pattern 14 are on the GND side, the point P11 is connected to the point P4, and the point P12 is P6.
Connect with dots.

A 180 ° phase shifter completed by forming external electrodes on the side surface of a multilayer substrate (laminate) on which dielectric layers consisting of the first layer 7-1 to the seventh layer 7-7 are laminated is The configuration is as shown in FIG.

In this example, external electrodes (external terminals) 17 to 22 are formed on the side surface of the multilayer substrate. In this case, the external electrode 21 is the input terminal IN and the external electrode 17 is the output terminal O.
UT1, the external electrode 19 is an output terminal OUT2, the external electrode 1
Reference numerals 8, 20, and 22 are GND electrodes.

§3: Description of characteristics of 180 ° phase shifter ...
See FIG. 6. FIG. 6 is a 180 ° phase shifter characteristic diagram. This characteristic diagram is
It is a characteristic diagram of 180 ° phase shifter for 1.6GH _Z bands.

In FIG. 6, the horizontal axis represents the primary coil 2 and
The coupling coefficient K with the secondary coil 3 is shown, and the vertical axis shows the amount of transmission (dB) and the amount of reflection (dB). The reflection amount is a signal amount reflected on the input side of the 180 ° phase shifter, and the transmission amount is an amount transmitted from the input side to the output side of the 180 ° phase shifter. In this case, if the transmission amount is large, the insertion loss amount inside is small, and conversely, if the transmission amount is small, the insertion loss amount is large.

In the conventional 180 ° phase shifter (see FIG. 11), when the coupling coefficient K was about 1.0, the reflection amount was the minimum value and the insertion loss amount was also the minimum value. However, in this embodiment, the amount of reflection is minimum and the amount of transmission is maximum when the coupling coefficient K is around K = 0.3. Therefore, the reflection amount and the insertion loss amount are minimum near K = 0.3.

§4: Various explanations of 180 ° phase shifter In the 180 ° phase shifter, the lowermost layer (component mounting surface side)
The pattern of the seventh layer 7-7 is a GND electrode pattern (solid pattern), and the hot-side capacitor electrode patterns 11 to 13 are set on the upper side thereof.

A spacer layer 7-5 is set between the transformer section and the capacitor section. Further, the transformer portion is formed such that the two secondary coils 8 and 10 sandwich the primary coil 9.

The disposition of the transformer section is set to obtain a required coupling coefficient, but is determined by, for example, the distance between coil layers. In this case, if the target coupling coefficient is obtained, the patterning may be performed in the lateral direction without arranging the coupling coefficients vertically.

Further, although the transformer section is free space in the up and down direction, the output level is likely to be different on the secondary side due to the capacitor section in the down direction. Therefore, even on the hot side of the capacitor, the pattern at the position facing the coil pattern of the transformer is eliminated.

That is, as shown in FIG. 5B, patterning is performed so that there is no hot-side capacitor electrode pattern on the lower side of each coil pattern in the transformer section (lower side in the stacking direction of the multilayer substrate).

Further, in order to reduce the output level difference, the shape of the coil pattern of the transformer is slightly changed (the coil patterns 8 and 10 forming the secondary coil are slightly increased or decreased). Can be taken by

As a design example of the 180 ° phase shifter, for example, in the case of a 180 ° phase shifter for 1.6 GHz _Z band, the inductance L of the coil of the transformer section is common to the primary side and the secondary side. ing.

In this design example, the coil inductance L is L = 1.5 nH and the coupling coefficient K is K = 0.3. The capacitance of the primary side capacitor is 8.8 pF, 2
The capacitance of the secondary side capacitor is 7.2 pF.

In this case, in the conventional 180 ° phase shifter,
The inductance L of the coil is L = 9 nH, the coupling coefficient K
Is a value close to about 1 (when the bond is as close as possible). Thus, it can be seen that the coupling coefficient is smaller in the present embodiment than in the conventional example.

In this frequency band, it is not necessary to use a ferrite core, and an air core coil can be used for design. §5: Description of a modification of the 180 ° phase shifter
-Refer to FIG. 7 FIG. 7 is a diagram showing a modified example of the transformer unit. It is also possible to modify the transformer part of the 180 ° phase shifter as follows.

The modified example shown in FIG. 7 is an example in which the coil pattern 10 forming the secondary coil and the coil pattern 9 forming the primary coil are reversed in the stacking direction of the multilayer substrate.

That is, the coil pattern 8 is formed on the second layer 7-2, the coil pattern 10 is formed on the third layer 7-3, and the coil pattern 9 is formed on the fourth layer 7-4.
Note that the configuration other than the transformer section is the same as the above-described configuration, and therefore description thereof is omitted.

In addition, in the first embodiment, the second layer 7-2
Alternatively, the coil pattern 9 may be formed on the third layer 7-3, the coil pattern 8 may be formed on the third layer 7-3, and the coil pattern 10 may be formed on the fourth layer 7-4.

(Description of Second Embodiment) FIGS. 8 and 9 are views showing a second embodiment of the present invention, which are the same as FIGS. 1, 10 and 11 in FIGS. Are denoted by the same reference numerals. Also, 30-1 to 30-10 are the first layer of the multilayer substrate to
10th layer (dielectric layer), 31 is a GND electrode pattern, 3
2, 33 and 34 show capacitor electrode patterns.

In the second embodiment, the capacitor section of the first embodiment is divided into two parts, a first capacitor section and a second capacitor section, and these two capacitor sections are laminated with a transformer section interposed therebetween. In this example, they are symmetrically arranged on both sides of the direction.
The equivalent circuit of the 180 ° phase shifter is the same as in FIG.

§1: Description of 180 ° phase shifter ... FIG.
See FIG. 9. FIG. 8 is an exploded perspective view of the 180 ° phase shifter of the second embodiment, and FIG. 9 is a completed view of the 180 ° phase shifter of the second embodiment (A is a perspective view, B is a sectional view taken along line XY). Is. The 180 ° phase shifter of the second embodiment will be described below with reference to FIGS. 8 and 9.

In the second embodiment, the multilayer substrate constituting the 180 ° phase shifter is composed of 10 layers (dielectric layers) consisting of the first layer 30-1 to the tenth layer 30-10. No patterning is performed on the first layer 30-1 constituting the multilayer substrate. This layer is used as a protective layer. Second layer 30-2
The third layer 30-3 is a layer forming the first capacitor section, and a capacitor electrode pattern (thick film pattern) is formed on each layer by printing a conductor paste or the like.

In this case, a GND electrode pattern (solid pattern) 31 forming a GND-side capacitor electrode is formed on the second layer 30-2. On the third layer 30-3, capacitor electrode patterns 32, 33 and 34 that form the capacitor electrodes on the hot side are formed.

The fourth layer 30-4 is a spacer layer (dummy layer).
And does not pattern anything. The fifth layer 30-5, the sixth layer 30-6, and the seventh layer 30-7 are layers that configure the transformer portion, and a coil pattern (thick film pattern) is formed on each layer by printing a conductor paste or the like. To form.

That is, the coil pattern 8 is formed on the fifth layer 30-5, the coil pattern 9 is formed on the sixth layer 30-6, and the coil pattern 1 is formed on the seventh layer 30-7.
Form 0. The eighth layer 30-8 is a spacer layer (dummy layer) and is not patterned.

The ninth layer 30-9 and the tenth layer 30-10
Is a layer constituting a capacitor portion, and a capacitor electrode pattern (thick film pattern) is formed on each layer by printing a conductor paste or the like.

In this case, on the ninth layer 30-9, the capacitor electrode pattern 1 constituting the hot side capacitor electrode is formed.
1, 12 and 13 are formed, and G is formed on the tenth layer 30-10.
A GND electrode pattern (solid pattern) 14 forming a capacitor electrode on the ND side is formed.

A 180 ° phase shifter completed by laminating the above layers to form a multilayer substrate and forming external electrodes on the side surfaces thereof is
It becomes as shown in FIG. That is, the external electrodes 17 to 22 are formed on the side surfaces of the multi-layer substrate to be SMDs (surface mount components).

As shown in the sectional view of FIG. 9B, in the 180 ° phase shifter of the second embodiment, the transformer portion is sandwiched between the first capacitor portion and the second capacitor portion on both sides of the multilayer substrate in the stacking direction.
The capacitors are arranged symmetrically.

In the second embodiment described above, the first capacitor section and the second capacitor section have the same structure, and the capacities of both capacitor sections are combined to set the same capacity as the capacitor section of the first embodiment. .

The fourth layer 30-4 to the tenth layer 30
The configuration of -10 is the same as that of the first embodiment (first embodiment of the first embodiment).
Layers 7-1 to 7-7) and the external electrodes 17 to 22 have the same structure as that of the first embodiment, and therefore the description thereof will be omitted.

§2: Explanation of Comparison with 180 ° Phase Shifter of First Embodiment In the case of the first embodiment, the patterns are not symmetrically arranged in the vertical direction of the stacking direction of the multilayer substrate ( On the lower side, the GND electrode pattern is set, but on the upper side, the GND electrode pattern is not set).

Therefore, when the coils of the transformer section are simply stacked, a level deviation occurs between the output terminals.
As a countermeasure against this, the level deviation can be minimized by changing the shapes of the coil patterns 8 and 10 forming the secondary side coil to some extent as described above.

However, in order to change the shape of the coil pattern, it is necessary to adjust the pattern of the screen used when forming the pattern. In the second embodiment, the secondary coil and each capacitor are symmetrically arranged in the up-down direction of the substrate around the coil pattern 9 forming the primary coil. If done, fine adjustment of each pattern as described above becomes unnecessary.
Therefore, the product development period can be shortened.

The characteristics shown in FIG. 6 are the same in the second embodiment. (Other Embodiments) Although the embodiments have been described above, the present invention can be implemented as follows.

An insulating layer may be used for the transformer section and the spacer layer (dummy layer). : It is possible to omit the spacer layer (dummy layer).

[0081]

As described above, the present invention has the following effects. : Since the multi-layer substrate is used and the transformer section and the capacitor section are constituted by the thick film pattern, the 180 ° phase shifter can be easily SMD and downsized. In particular, the height can be reduced as compared with the conventional example.

Since winding work (see the conventional example) is unnecessary, mass productivity can be improved. It is also advantageous in terms of cost. : Since the spacer layer (dummy layer) is provided between the transformer section and the capacitor section, the stray capacitance between the transformer section and the capacitor section can be reduced. As a result, the Q of the coil of the transformer section is increased, so that the insertion loss is reduced and a predetermined attenuation characteristic can be secured.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a 180 ° phase shifter equivalent circuit of the first embodiment.

FIG. 3 is an exploded perspective view of a 180 ° phase shifter according to the first embodiment.

FIG. 4 is an explanatory diagram of each part of FIG.

FIG. 5 is a completed 180 ° phase shifter of the first embodiment (A is a perspective view and B is a sectional view taken along line XY).

FIG. 6 is a 180 ° phase shifter characteristic diagram of the first embodiment.

FIG. 7 is a modification of the transformer section of the first embodiment.

FIG. 8 is an exploded perspective view of a 180 ° phase shifter according to a second embodiment.

FIG. 9 is a completed 180 ° phase shifter of the second embodiment (A is a perspective view and B is a sectional view taken along line XY).

FIG. 10 is an explanatory diagram of a conventional 180 ° phase shifter.

FIG. 11 is a characteristic diagram of a conventional 180 ° phase shifter.

[Explanation of symbols] 1 toroidal core (ferrite) 2 primary coil (primary winding) 3, 4 secondary coil (secondary winding) IN input terminal OUT1, OUT2 output terminal 14, 31 GND electrode pattern

Claims (4)

[Claims] 1. A primary coil (2) and two coils (2)
It has a secondary coil (3, 4), and this secondary coil (3, 4)
4) is a 180 ° phase shifter using a transformer in which the connection point is grounded and the connection point is grounded. The 180 ° phase shifter is composed of a multilayer substrate, and a plurality of coil patterns ( 8, 9, 1
0) is set as a transformer section, and the primary side and secondary side coils (2 to 4) are configured by this transformer section, and the GND electrode pattern (14) and a plurality of capacitors are provided on the multilayer substrate. An electrode pattern (11 to 13) is set to form a capacitor part, and the capacitor part is integrated with the transformer part, and one of the primary side coil (2) and the secondary side coil (3, 4) is A 180 ° phase shifter, to which capacitors (C1, C2, C3) of the capacitor section whose electrodes are grounded are connected. 2. The GND electrode pattern (14) of the capacitor portion is formed as a solid pattern (a pattern formed on substantially the entire surface of the board) at a position which becomes the lowermost pattern (component mounting surface side) of the multilayer board. The 180 ° phase shifter according to claim 1, wherein the 180 ° phase shifter is set. 3. The first capacitor part and the second capacitor part are formed by dividing the capacitor part into two parts, on both sides of the transformer part in the stacking direction of the multilayer substrate.
The 180 ° phase shifter according to claim 1, wherein the first capacitor section and the second capacitor section are symmetrically arranged. 4. The GND electrode patterns (14, 31) of the first and second capacitor portions are arranged on the uppermost side (opposite side to the component mounting surface) and the lowermost side (component mounting surface side) of the multilayer substrate. At the position
It is set as a solid pattern (a pattern formed on substantially the entire surface of the substrate), and both sides of the transformer part and the capacitor part in the stacking direction are sandwiched by the two GND electrode patterns (14, 31). The 180 ° phase shifter according to claim 3.