Transformer

Abstract

To provide a transformer capable of reducing loss as compared with a conventional transformer.SOLUTION: A first transmission line provided on a principal surface of a first layer, an input signal being input to one end of the first transmission line, the other end of the first transmission line being electrically connected to an output terminal, one end of the second transmission line being electrically connected to one end of the first transmission line, A second transmission line that is provided on a main surface of a second layer different from the first layer, the other end of the second transmission line being grounded, the second transmission line being electromagnetically coupled to the first transmission line and inducing a current in a direction opposite to a direction of a current flowing through the first transmission line, one of the first transmission line and the second transmission line including a first wiring and a second wiring connected in parallel to the first wiring in a range in which the first transmission line and the second transmission line overlap when viewed in a stacking direction in which the first layer and the second layer are stacked.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to transformers. [Background technology]

[0002] In recent years, there has been a demand for electronic devices to be even smaller and thinner. Electronic components are integrated into these electronic devices. When integrating electronic components, it is important to integrate magnetic elements such as transformers and reduce loss. To reduce loss, a transformer has been disclosed that can increase the coupling coefficient between the primary coil and the secondary coil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-134354 Summary of the Invention [Problem to be solved by the invention]

[0004] The transformer described in Patent Document 1 has a primary winding formed by connecting a single-turn lower coil and a single-turn upper coil on a multilayer substrate with via holes. The transformer has a single-turn coil, which is a secondary winding, between the lower coil and the upper coil. The transformer can confine magnetic flux generated by electromagnetic induction between the primary coil and the secondary coil between the upper and lower surfaces, thereby increasing the coupling coefficient between the primary coil and the secondary coil and improving conversion efficiency. This allows the transformer to reduce loss.

[0005] However, depending on the characteristic impedance of the circuit, it may be necessary to reduce the overlapping area between the primary coil and the secondary coil in top view. In this case, the line width of the primary coil and the secondary coil becomes significantly smaller, which causes the problem of increased loss.

[0006] Therefore, an object of the present invention is to provide a transformer that can reduce loss compared to conventional transformers. [Means for solving the problem]

[0007] A transformer according to one aspect of the present invention comprises: a first transmission line provided on a main surface of a first layer, having one end to which an input signal is input and the other end electrically connected to an output terminal; and a second transmission line provided on a main surface of a second layer different from the first layer, having one end electrically connected to one end of the first transmission line and the other end grounded, the second transmission line being electromagnetically coupled to the first transmission line to induce a current in the opposite direction to the current flowing in the first transmission line, wherein either the first transmission line or the second transmission line includes a first wiring and a second wiring connected in parallel to the first wiring in a range where the first transmission line and the second transmission line overlap when viewed from the stacking direction in which the first layer and the second layer are stacked. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a transformer that can achieve lower loss compared to conventional transformers. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of a transformer configuration. [Figure 2] FIG. 2 is a schematic perspective view showing an example of the configuration of a transformer. [Figure 3] FIG. 2 is a schematic diagram of a transformer viewed from the lamination direction. [Figure 4] FIG. 2 is a view of a portion of a first transmission line and a portion of a second transmission line viewed from the lamination direction. [Figure 5] FIG. 2 is a schematic diagram showing the connection relationship between a transformer and a capacitor. [Figure 6] FIG. 2 is a schematic diagram showing the connection relationship between a transformer and a power supply Vcc. [Figure 7] FIG. 1 is a diagram showing an example of a cross section of a transformer on a six-layer multilayer board. [Figure 8] FIG. 10 is a schematic perspective view showing an example of the configuration of a transformer according to a first modified example. [Figure 9] FIG. 10 is a schematic view of a transformer according to a second modified example, viewed from the lamination direction. [Figure 10] FIG. 10 is a diagram illustrating an example of the definition of a circuit. [Figure 11] 1 is a graph showing the relationship between path length and Euclidean distance. [Figure 12] FIG. 2 is a schematic diagram of a transformer viewed from the lamination direction. [Figure 13] FIG. 10 is a configuration diagram showing an example in which a bridge portion is provided in a transformer according to a second modified example. [Figure 14] FIG. 10 is a diagram showing an example of a cross section of a transformer according to a third modified example. [Figure 15] FIG. 4 is a schematic diagram of the configuration of such a transformer according to a fourth modification. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, each embodiment of the present disclosure will be described with reference to the drawings.

[0011] ===Configuration=== An overview of the configuration of transformer 100 will be described with reference to Fig. 1. Fig. 1 is a schematic diagram of the configuration of transformer 100.

[0012] The transformer 100 is a circuit for, for example, matching impedance by impedance conversion using two electromagnetically coupled transmission lines, or for converting differential signals and single-ended signals. The transformer 100 is formed, for example, from a multilayer substrate. For convenience, the terms "primary" and "secondary" are sometimes used in the following description of the transformer 100, but the transformer 100 also includes a configuration in which the terms "primary" and "secondary" are interchanged.

[0013] 1, transformer 100 includes a first transmission line 110 and a second transmission line 120. Each transmission line of transformer 100 is provided on a respective main surface of a plurality of layers. Hereinafter, for convenience, the direction in which the plurality of layers are stacked is referred to as the "stacking direction," and a view from the stacking direction is referred to as the "view from the stacking direction."

[0014] In the transformer 100, when the first transmission line 110 and the second transmission line 120 are electromagnetically coupled between different layers, the overlapping area of ​​the first transmission line 110 and the second transmission line 120 as viewed in the stacking direction is determined based on the characteristic impedance of the circuit. In this case, the line width of each transmission line in the transformer 100 needs to be reduced. In response to this, the transformer 100 has a configuration that enables the line width of the first transmission line 110 and the second transmission line 120 to be increased.

[0015] With this configuration, transformer 100 can avoid an increase in transmission loss due to a narrow line width of the transmission line and damage to the transmission line due to insufficient power resistance to the power source and fundamental wave.

[0016] The first transmission line 110 is provided, for example, on the main surface of a first layer (for example, layer Ly2 in FIG. 7), one end of which is electrically connected to an input terminal Tin to receive an input signal RFin, and the other end of which is electrically connected to an output terminal Tout.

[0017] The first transmission line 110 includes, for example, a first wiring 111 and a second wiring 112 connected in parallel to the first wiring 111. The first wiring 111 is provided in parallel to the second wiring 112 at a predetermined distance. That is, the first transmission line 110 is formed by providing the first wiring 111 and the second wiring 112 in parallel to each other so as to form a predetermined gap therebetween.

[0018] The second transmission line 120 is provided, for example, on a main surface of a second layer (for example, layer Ly1 in FIG. 7) different from the layer on which the first transmission line 110 is provided, and is electromagnetically coupled to the first transmission line 110. For example, one end of the second transmission line 120 is electrically connected to one end of the first transmission line 110, and the other end is electrically connected to the ground 130. That is, a current is induced in the second transmission line 120 in the opposite direction to the current flowing in the first transmission line 110.

[0019] In the transformer 100, the second transmission line 120 is arranged so as to overlap with a portion and a gap of each of the first wiring 111 and the second wiring 112 in the first transmission line 110 when viewed in the stacking direction. This allows the line width of the transmission line in the transformer 100 to be increased, thereby improving the power durability and reducing loss.

[0020] Next, the configuration of transformer 100 will be described in detail with reference to Figures 2 and 3. Figure 2 is a schematic perspective view showing an example of the configuration of transformer 100. Figure 3 is a schematic view of transformer 100 viewed from the stacking direction.

[0021] 2 and 3, the Y direction is the stacking direction of transformer 100, and the X and Z directions are directions perpendicular to the Y direction. In this case, "viewed from the stacking direction" means viewed from the Y direction in which the layers in the multilayer substrate are stacked.

[0022] 2, it is desirable that the transformer 100 be wound along the XZ plane. This allows the transformer 100 to be miniaturized. It is also desirable that the transformer 100 be formed so that the centers C of the first transmission line 110 and the second transmission line 120 are coaxial. The via conductor electrically connects the first transmission line 110 and the second transmission line 120, for example.

[0023] The transformer 100 is configured, for example, so that the first transmission line 110 serves as the primary winding and the second transmission line 120 serves as the secondary winding. A current I1 flows in the direction of the solid arrow in the first transmission line 110, which is the primary winding. A current I2 induced by the current I1 flowing in the first transmission line 110 flows in the direction of the dashed arrow in the second transmission line 120.

[0024] 3, the first transmission line 110 is configured by connecting a first wiring 111 and a second wiring 112 in parallel. The first wiring 111 is provided in parallel to the second wiring 112 with a gap 113 between them.

[0025] Second transmission line 120 is provided on the principal surface of a predetermined layer so as not to intersect with first transmission line 110 when viewed in the stacking direction. Second transmission line 120 is provided along gap 113 between first wiring 111 and second wiring 112 so as to partially overlap with each of first wiring 111 and second wiring 112 when viewed in the stacking direction. This allows the line width of second transmission line 120 in transformer 100 to be increased by the amount of gap 113, thereby enabling low loss.

[0026] 4, it will be described that in transformer 100, compared to conventional transformers, it is possible to maintain the overlapping area between first transmission line 110 and second transmission line 120 as viewed in the stacking direction, while increasing the line width of first transmission line 110 and the line width of second transmission line 120. Fig. 4 is a diagram of a portion of first transmission line 110 and second transmission line 120 as viewed in the stacking direction.

[0027] In the transformer 100, the overlapping area of ​​the two transmission lines as viewed in the lamination direction is determined, for example, based on the characteristic impedance of the circuit. In this case, the widths of the two transmission lines in the transformer must be significantly narrowed. If the widths of the transmission lines are narrow, problems arise, such as increased signal loss, reduced power handling, and a decrease in the overlapping area due to misalignment of one of the two transmission lines due to layer misalignment in the laminate structure, making it impossible to obtain the desired characteristics.

[0028] Regarding this, for example, if transformer 100 has a structure in which two parallel-connected wirings provided on different layers have no gaps when viewed in the stacking direction, i.e., if it has a structure in which only one of the transmission lines is made wider, signal loss can be reduced to a certain extent and the problem of characteristic degradation due to layer misalignment can be solved. However, because the line width of the other transmission line remains thin, the problem of increased signal loss cannot be completely solved, and the problem of reduced power handling cannot be solved.

[0029] Therefore, transformer 100 has a structure that ensures a desired overlapping area between two electromagnetically coupled transmission lines while increasing the line widths of both of the two transmission lines. As shown in FIG. 4(a), the desired overlapping area between the two transmission lines is the sum of the area of ​​overlap Ov10 and the area of ​​overlap Ov20. Here, as shown in FIG. 4(a), first transmission line 110 has a line width that is greater than the sum of the widths of overlap Ov10 and overlap Ov20. Also, as shown in FIG. 4(a), second transmission line 120 has a line width that is greater than the sum of the widths of overlap Ov10 and overlap Ov20 plus the width of gap 113. In this way, transformer 100 increases the line widths of the two transmission lines by utilizing gap 113, where the capacitive coupling between the two transmission lines is weakened. In contrast, a conventional transformer is composed of two transmission lines each having a line width equal to the sum of the line width of an overlap of 0v10 and the line width of an overlap of 0v20.

[0030] Furthermore, in transformer 100, for example, even if at least one of first transmission line 110 and second transmission line 120 is misaligned in the XZ plane, the overlapping area between first transmission line 110 and second transmission line 120 is maintained. This is evident from the fact that, in transformer 100, the sum of the area of ​​overlap Ov10 and the area of ​​overlap Ov20 in FIG. 4(a) is equal to the sum of the area of ​​overlap Ov11 and the area of ​​overlap Ov21 in FIG. 4(b). As a result, transformer 100 can maintain desired characteristics even if the two transmission lines are misaligned due to layer misalignment in a laminated structure during the manufacturing process, for example.

[0031] Next, the connection relationship between the transformer 100 and various elements will be described with reference to Figures 5 and 6. Figure 5 is a schematic diagram showing the connection relationship between the transformer 100 and a capacitor. Figure 6 is a schematic diagram showing the connection relationship between the transformer 100 and a power supply Vcc.

[0032] 5(a), the transformer 100 may be configured such that the input signal RFin is input to the input terminal Tin via a capacitor C1, for example. This allows the transformer 100 to isolate the input terminal Tin, to which the power supply Vcc is applied, from the ground 130 in terms of DC. It also allows the input terminal Tin, to which the power supply Vcc is applied, from the output terminal Tout in terms of DC.

[0033] 5(b), the transformer 100 may have a capacitor provided between the output terminal Tout and the ground 130. Specifically, in the transformer 100, a capacitor C2 is provided in series between the first transmission line 110 and the output terminal Tout, and a capacitor C3 is provided in series between the second transmission line 120 and the ground 130. This allows for DC isolation between the input terminal Tin, to which the power supply Vcc is applied, and the output terminal Tout and the ground 130.

[0034] As shown in Fig. 6, the transformer 100 may be configured to supply the power supply Vcc from a port of ground 130 that is DC-isolated by a capacitor, for example. Specifically, in the transformer 100, the power supply Vcc is electrically connected to the port of ground 130 in the configuration shown in Fig. 5(b). As a result, in the transformer 100, the power supply Vcc is connected to the collector of the transistor Tr via an inductor, but this can be eliminated, thereby making it possible to reduce the size of the circuit.

[0035] ===Manufacturing method=== An example of a method for manufacturing transformer 100 will be described with reference to Fig. 7. Fig. 7 is a diagram showing an example of a cross section of transformer 100 made of a six-layer multilayer substrate. Fig. 7 shows only elements related to transformer 100, and omits, for example, via conductors, wiring, electronic elements, and the like other than the elements.

[0036] First, a layer Ly6 is formed on a semiconductor substrate by, for example, chemical vapor deposition, sputtering, spin coating, or the like. The layer Ly6 is made of, for example, SiO2, SiN, or SiON, and serves to protect various electronic elements. Note that, for example, layers Ly5, Ly4, Ly3, Ly2, and Ly1, which will be described later, are similar to the layer Ly6. Next, a ground 130 is formed on the layer Ly6 by, for example, an etching process. Next, layers Ly5, Ly4, Ly3, and Ly2 are formed by the same method as the layer Ly6. Next, a first wiring 111 and a second wiring 112 are formed on the layer Ly2, separated by a gap 113, by, for example, an etching process. Next, via holes are formed in the layer Ly1 by a drilling technique using a laser, or the like. Then, a conductor is embedded in the via hole to form a via conductor (not shown). Next, the second transmission line 120 is formed on the layer Ly1 so as to be electrically connected to the first transmission line 110 through the via conductor, thereby completing the manufacture of the transformer 100.

[0037] As described above, when the ground 130 is provided on the lowest layer, i.e., when an insulating film is provided between the ground 130 and the layer Ly2, the distance between the ground 130 and the first transmission line 110 and the second transmission line 120 can be secured, and therefore, the parasitic capacitance between the ground 130 and the first transmission line 110 and the second transmission line 120 can be suppressed.

[0038] In the above description, the first transmission line 110 is formed on the top layer, but this is not limiting and the first transmission line 110 may be formed on an intermediate layer (e.g., layer Ly2, Ly3, etc.). In the above description, the transformer 100 is formed on the bottom layer, but this is not limiting. For example, the ground 130 may be formed on layer Ly5 or layer Ly4.

[0039] === Variations === <<First Modification>> A transformer 100a according to a first modified example will be described with reference to Fig. 8. Fig. 8 is a schematic perspective view showing an example of the configuration of transformer 100a according to the first modified example. Only differences from transformer 100 will be described below, and unless otherwise specified, it will be considered to be the same as transformer 100.

[0040] As shown in FIG. 8, transformer 100a differs from transformer 100 in that it includes bridge portion 114. Bridge portion 114 is provided in gap 113 and electrically connects first wiring 111 and second wiring 112. In other words, in transformer 100a, bridge portion 114 forms a slit in gap 113 between first wiring 111 and second wiring 112. This makes it easier to form first transmission line 110 in the etching step of the manufacturing process than if only gap 113 were formed between first wiring 111 and second wiring 112. In other words, it is possible to reduce the tolerance that occurs in gap 113 between first wiring 111 and second wiring 112 during the manufacturing process.

[0041] <<Second Modification>> A transformer 100b according to a second modification will be described with reference to Fig. 9. Fig. 9 is a schematic diagram of the transformer 100b according to the second modification as viewed from the stacking direction. Only differences from the transformer 100 will be described below, and unless otherwise specified, the transformer 100b will be considered to be the same as the transformer 100.

[0042] As shown in Fig. 9, a transformer 100b according to the second modification has a winding portion in which the first transmission line 110 is wound multiple times in the XZ plane, which is the main surface of a predetermined layer, compared to the transformer 100. Here, an example of the definition of "winding" for the first transmission line 110 will be described with reference to Figs. 10 and 11. Fig. 10 is a diagram for explaining an example of the definition of "winding." Fig. 11 is a graph showing the relationship between path length and Euclidean distance.

[0043] 10, an XY Cartesian coordinate system is defined with the inner end of the first transmission line 110 as the origin O. The first transmission line 110 passes through an arbitrary route from the origin O to an end point E on the outer periphery. In FIG. 10, the path length from the origin O to an arbitrary point P on the first transmission line 110 is represented by L. Also in FIG. 10, the Euclidean distance between the origin O and point P is represented by D.

[0044] In this case, as shown in FIG. 11 , the Euclidean distance D reaches a first maximum value at point P1 of first transmission line 110. Then, the Euclidean distance D reaches a minimum value at point P2, reaches a second maximum value at point P3, and reaches end point E. In transformer 100b according to the second modification, for example, the number of turns may be defined as the number of pairs of a maximum value and a minimum value that appears next to the maximum value. Alternatively, the number of turns may be defined as the number of maximum values. That is, in this case, first transmission line 110 shown in FIG. 10 has one pair of a first maximum value and a minimum value, and also has a second maximum value, and is therefore formed by two turns.

[0045] The number of turns may be defined as the total angle through which the first transmission line 110 changes direction, divided by 360 degrees, and then rounded off. That is, in Fig. 10, the first transmission line 110 changes direction by 90 degrees at each corner of the transmission line. Therefore, the first transmission line 110 according to the second modification changes direction by 630 degrees, and may therefore be considered to be formed with two turns.

[0046] Hereinafter, for convenience, with regard to the winding portion of the first transmission line 110, the first winding from the inside will be referred to as the "first winding portion 110a," and the second winding from the inside, which is longer than the first winding portion 110a, will be referred to as the "second winding portion 110b."

[0047] Returning to Fig. 9, the configuration of transformer 100b according to the second modification will be described. As shown in Fig. 9, first transmission line 110 of transformer 100b includes first wiring 111 and second wiring 112 that is provided parallel to first wiring 111 with a gap 113 therebetween in the XZ plane.

[0048] The first wiring 111 and the second wiring 112 are composed of a first winding portion 110a which is the first turn from the inside in the XZ plane, and a second winding portion 110b which is the second turn from the inside and is arranged parallel to the first winding portion 110a so that a current flows in the same direction as the current flowing in the first winding portion 110a.

[0049] 9, second transmission line 120 of transformer 100b includes third wiring 121 and fourth wiring 122. Third wiring 121 is provided, for example, in the stacking direction, along gap 113 between first wiring 111 and second wiring 112 in first winding portion 110a, so as to partially overlap first wiring 111 and second wiring 112. Fourth wiring 122 is connected in parallel to third wiring 121 and is provided, for example, in the stacking direction, along gap 113 between first wiring 111 and second wiring 112 in second winding portion 110b, so as to partially overlap first wiring 111 and second wiring 112. This allows the line width of the transmission line to be increased in transformer 100b.

[0050] In the above description, the first transmission line 110 is formed in two turns, but this is not limiting. For example, the first transmission line 110 is wired so that the distance between the input terminal Tin or an end of the first transmission line 110 electrically connected to the input terminal Tin (hereinafter simply referred to as the "input terminal Tin") and the output terminal Tout or an end of the first transmission line 110 electrically connected to the output terminal Tout (hereinafter simply referred to as the "output terminal Tout") is long.

[0051] Referring to Fig. 12, a first transmission line 110 that is wired so that the distance between the input terminal Tin and the output terminal Tout is long will be described. Fig. 12 is a schematic diagram of a transformer 100b viewed from the stacking direction. Note that, hereinafter, only differences from the transformer 100b in Fig. 9 will be described, and unless otherwise specified, the transformer 100b will be considered to be the same as the transformer 100b in Fig. 9.

[0052] The first transmission line 110 of the transformer 100b shown in Fig. 12 is wound around to point P3 in Fig. 10. That is, the first transmission line 110 is wound around one and a half times in the XZ plane. In this case, the distance between the output terminal Tout and the input terminal Tin and the ground 130 is the longest. This makes it easier to manufacture the transformer 100b.

[0053] Next, a configuration in which a bridge portion is provided in transformer 100b will be described with reference to Fig. 13. Fig. 13 is a configuration diagram showing an example in which a bridge portion is provided in transformer 100b according to a second modified example.

[0054] 13, transformer 100b may have a bridge portion on at least one of the two transmission lines. Specifically, transformer 100b may have bridge portion 114 on first transmission line 110 and bridge portion 123 on second transmission line 120.

[0055] In this case, the first wiring 111 is electrically connected to the second wiring 112 at at least one bridge portion 114 in a gap 113 between one end and the other end. The third wiring 121 is electrically connected to the fourth wiring 122 at at least one bridge portion 123 in a gap between the third wiring 121 and the fourth wiring 122 between one end and the other end.

[0056] This makes it easier to form the first transmission line 110 and the second transmission line 120 in the etching step of the manufacturing process. That is, it becomes possible to reduce the tolerance that occurs in the gap between the first transmission line 110 and the second transmission line 120 in the manufacturing process.

[0057] <<Third Modification>> A transformer 100c according to the third modification will be described with reference to Fig. 14. Fig. 14 is a diagram showing an example of a cross section of the transformer 100c according to the third modification. In Fig. 14, only elements related to the transformer 100c are shown, and other elements such as via conductors, wiring, and electronic elements are omitted. Below, only differences from the transformer 100 will be described, and unless otherwise specified, the transformer 100 will be considered to be the same as the transformer 100.

[0058] 14, a transformer 100c according to the third modification differs from the transformer 100 shown in FIG. 7 in that a first wiring 111 is provided on a main surface of a layer Ly1 that is different from the main surface of a layer Ly3 on which a second wiring 112 is provided. Specifically, the transformer 100c includes a first wiring 111 provided on the main surface of the layer Ly1, a second wiring 112 provided on the main surface of the layer Ly3, and a second transmission line 120 provided on the main surface of a layer Ly2 between the layers Ly1 and Ly3.

[0059] When viewed in the stacking direction, the second transmission line 120 is provided so that a part of its main surface in the +Y direction overlaps a part of the first wiring 111, and a part of its main surface in the -Y direction overlaps a part of the second wiring 112. This allows for appropriate design depending on the conditions under which the wiring can be installed.

[0060] In addition, in FIG. 14, the second transmission line 120, the first wiring 111, and the second wiring 112 are shown as being provided on adjacent layers, but this is not limited to this, and for example, each wiring may be provided separated by a predetermined layer.

[0061] <<Fourth Modification>> A transformer 100d according to a fourth modified example will be described with reference to Fig. 15. Fig. 15 is a schematic diagram of the configuration of transformer 100d according to the fourth modified example. Only differences from transformer 100 will be described below, and unless otherwise specified, it will be considered to be the same as transformer 100.

[0062] As shown in FIG. 15, a transformer 100d according to the fourth modification differs from transformer 100 shown in FIG. 1 in that a second transmission line 120d is formed by two lines connected in parallel.

[0063] Specifically, the second transmission line 120d includes a first wiring 121d and a second wiring 122d provided parallel to the first wiring 121d with a gap therebetween when viewed from the stacking direction. On the other hand, the first transmission line 110d is provided on a principal surface of a layer different from the layer on which the second transmission line 120d is provided so as to overlap with parts of the first wiring 121d and the second wiring 122d and the gap when viewed from the stacking direction.

[0064] That is, the transformer 100d has a configuration in which the terminal electrically connected to the ground 130 and the output terminal Tout are interchanged with respect to the transformer 100 shown in Fig. 2. This allows the transformer 100d to increase the line widths of the first transmission line 110d and the second transmission line 120d, thereby enabling low loss.

[0065] ===Summary=== <1> The transformer 100 according to the exemplary embodiment of the present disclosure includes a first transmission line 110 provided on a main surface of a first layer, one end of which is input with an input signal RFin and the other end of which is electrically connected to an output terminal Tout, and a second transmission line 120 provided on a main surface of a second layer different from the first layer, one end of which is electrically connected to one end of the first transmission line 110 and the other end of which is grounded, the second transmission line 120 being electromagnetically coupled to the first transmission line 110. and a second transmission line 120 in which a current opposite to the current flowing in the first transmission line 110 is induced, and either the first transmission line 110 or the second transmission line 120 includes a first wiring 111 and a second wiring 112 connected in parallel to the first wiring 111 in a range where the first transmission line 110 and the second transmission line 120 overlap when viewed from the lamination direction in which the first layer and the second layer are laminated. This allows the line width of the transmission line in the transformer 100 to be widened, thereby suppressing deterioration in characteristics due to layer misalignment in the laminated structure and enabling low loss.

[0066] <2> Furthermore, in the transformer 100 according to the exemplary embodiment of the present disclosure, the first transmission line 110 includes a first wiring 111 and a second wiring 112 arranged parallel to the first wiring 111 with a gap 113 therebetween, as viewed in the stacking direction, and the second transmission line 120 is arranged on the principal surface of the second layer such that a portion of the first wiring 111, a portion of the second wiring 112, and the gap 113 overlap with each other, as viewed in the stacking direction. <1> This allows the transformer 100 to have a wide transmission line width, thereby suppressing deterioration in characteristics due to misalignment of layers in the laminated structure, improving power durability, and enabling low loss.

[0067] <3> Furthermore, in a transformer 100d according to an exemplary embodiment of the present disclosure, a second transmission line 120d includes a first wiring 121d and a second wiring 122d provided parallel to the first wiring 121d with a gap therebetween, as viewed in the stacking direction, and a first transmission line 110d is provided on a principal surface of the first layer so as to overlap a portion of the first wiring 121d, a portion of the second wiring 122d, and the gap, as viewed in the stacking direction. <1> This allows the transformer 100 to have a wide transmission line width, thereby suppressing deterioration in characteristics due to misalignment of layers in the laminated structure, improving power durability, and enabling low loss.

[0068] <4> In the transformer 100a according to the exemplary embodiment of the present disclosure, the first wiring 111 is electrically connected to the second wiring 112 between one end and the other end by at least one bridge portion 114. <1> from <3> The transformer according to any one of the items 1 to 5, wherein the transformer 100 is easy to manufacture and allows the line width of the transmission line to be widened, thereby suppressing deterioration of characteristics due to layer misalignment, improving power durability, and enabling low loss.

[0069] <5> Furthermore, in transformer 100b according to the exemplary embodiment of the present disclosure, first wiring 111 and second wiring 112 are configured to be parallel to each other when viewed from the stacking direction, and have winding portions wound on the main surface of the same layer, and the winding portions include first winding portion 110a which is a portion that makes one turn, and second winding portion 110b which is a portion that is longer than first winding portion 110a and is arranged to be parallel to first winding portion 110a when viewed from the stacking direction, and is arranged so that a current flows in the same direction as a current flowing in first winding portion 110a. <1> from <4> The transformer according to any one of the items 1 to 5, wherein the transformer 100 has a wide transmission line width, which suppresses deterioration of characteristics due to misalignment of layers in the laminated structure, improves power durability, and reduces loss.

[0070] <6> Furthermore, in transformer 100b according to the exemplary embodiment of the present disclosure, of first transmission line 110 and second transmission line 120, first transmission line 110 or second transmission line 120 that does not include first wiring 111 and second wiring 112 includes, when viewed from the stacking direction, third wiring 121 provided to overlap with part of first wiring 111 and part of second wiring 112, and gap 113 between first wiring 111 and second wiring 112 in first winding part 110a, and fourth wiring 122 provided to overlap with part of first wiring 111 and part of second wiring 112, and gap 113 between first wiring 111 and second wiring 112 in second winding part 110b, when viewed from the stacking direction. <5> This allows the transformer 100 to have a wide transmission line width, thereby suppressing deterioration in characteristics due to misalignment of layers in the laminated structure, improving power durability, and enabling low loss.

[0071] <7> Furthermore, in the transformer 100c according to the exemplary embodiment of the present disclosure, the first wiring 111 is provided on a main surface of a layer (e.g., layer Ly1 in FIG. 14) different from a layer (e.g., layer Ly3 in FIG. 14) on which the second wiring 112 is provided, and the transmission line (e.g., second transmission line 120 in FIG. 14) that does not include the first wiring 111 and the second wiring 112 of the first transmission line 110 and the second transmission line 120 is provided on a main surface of a layer (e.g., layer Ly2 in FIG. 14) between the layer on which the first wiring 111 is provided and the layer on which the second wiring 112 is provided. <1> from <6> The transformer according to any one of the items 1 to 5, wherein the transformer 100 has a wide transmission line width, which suppresses deterioration of characteristics due to misalignment of layers in the laminated structure, improves power durability, and reduces loss.

[0072] The above-described embodiments are intended to facilitate understanding of the present disclosure and are not intended to limit the present disclosure. The present disclosure may be modified or improved without departing from its spirit, and equivalents thereof are also included in the present disclosure. In other words, designs modified by a person skilled in the art as appropriate are also included within the scope of the present disclosure as long as they comprise the features of the present disclosure. The elements and their arrangements included in the embodiments are not limited to those exemplified and can be modified as appropriate. [Explanation of symbols]

[0073] 100, 100a, 100b, 100c...transformer, 110, 110d...first transmission line, 111, 121d...first wiring, 112, 122d...second wiring, 114...bridge section, 110a...first circular section, 110b...second circular section, 120, 120d...second transmission line, 121...third wiring, 122...fourth wiring.

Claims

1. a first transmission line provided on a principal surface of the first layer, the first transmission line having one end to which an input signal is input and the other end electrically connected to an output terminal; a second transmission line provided on a principal surface of a second layer different from the first layer, the second transmission line having one end electrically connected to one end of the first transmission line and the other end grounded, a second transmission line that is electromagnetically coupled to the first transmission line and that induces a current in a direction opposite to that of the current flowing through the first transmission line; Equipped with one of the first transmission line and the second transmission line includes a first wiring and a second wiring connected in parallel to the first wiring in a range where the first transmission line and the second transmission line overlap when viewed from a stacking direction in which the first layer and the second layer are stacked; Transformer.

2. the first transmission line includes, as viewed from the stacking direction, the first wiring and the second wiring provided parallel to the first wiring with a gap therebetween; the second transmission line is provided on a principal surface of the second layer so as to overlap with a portion of the first wiring, a portion of the second wiring, and the gap when viewed from the stacking direction; 2. The transformer of claim 1.

3. the second transmission line includes, as viewed from the stacking direction, the first wiring and the second wiring provided parallel to the first wiring with a gap therebetween; the first transmission line is provided on a principal surface of the first layer so as to overlap with a portion of the first wiring, a portion of the second wiring, and the gap when viewed from the stacking direction; 2. The transformer of claim 1.

4. The first wiring is electrically connected to the second wiring by at least one bridge portion between one end and the other end.

2. The transformer of claim 1.

5. The first wiring and the second wiring are When viewed from the stacking direction, the winding portions are configured to be parallel to each other and wound on the main surface of the same layer, The circumferential portion is a first winding portion of the one winding; a second winding portion that is longer than the first winding portion and that is provided in parallel to the first winding portion when viewed from the stacking direction and that allows a current to flow in the same direction as a current flowing in the first winding portion, A transformer according to any one of claims 1 to 4.

6. Of the first transmission line and the second transmission line, the first transmission line or the second transmission line that does not include the first wiring or the second wiring is a third wiring 121 provided so as to overlap a part of the first wiring and a part of the second wiring, and a gap between the first wiring and the second wiring in the first winding portion, when viewed from the stacking direction; a fourth wiring provided to overlap a portion of the first wiring, a portion of the second wiring, and a gap between the first wiring and the second wiring in the second winding portion, when viewed from the stacking direction; Including, 6. The transformer of claim 5.

7. the first wiring is provided on a major surface of a layer different from a layer on which the second wiring is provided; the transmission line not including the first wiring and the second wiring out of the first transmission line and the second transmission line is provided on a main surface of a layer between a layer on which the first wiring is provided and a layer on which the second wiring is provided; 2. The transformer of claim 1.

Images