Directional coupler
By configuring conductor paths and grounding conductors on a multilayer dielectric substrate and adopting a specific edge arrangement, the problem of increased substrate thickness in existing directional couplers is solved, impedance adjustment and coupling stability are achieved, and the structural compactness is improved.
Patent Information
- Application Number
- CN202210961601.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2021-10-12
- Filing Date
- 2022-08-11
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2042-08-11
AI Technical Summary
Existing directional couplers require increased substrate thickness to adjust impedance and suppress coupling deviation, resulting in unnecessary structural increases.
A multilayer dielectric substrate structure is adopted. By configuring conductors and grounding conductors on different layers, electromagnetic coupling between conductors is achieved. When viewed from above, the end edges are arranged in a specific order to avoid excessive conductor width and reduce the substrate thickness requirement.
Without increasing the substrate thickness, coupling deviation is effectively suppressed and impedance is adjusted, improving structural compactness and performance stability.
Smart Images
Figure CN115966873B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a directional coupler. BACKGROUND
[0002] In Patent Document 1, a directional coupler is described, which includes a substrate, a first line conductor, a second line conductor, and a ground conductor, the first line conductor is electromagnetically coupled to the second line conductor, the first line conductor is disposed between the ground conductor and the second line conductor, and the line width of the second line conductor is wider than that of the first line conductor. Thus, even if the substrate is shifted in layers, the first line conductor does not protrude from the second line conductor when the substrate is viewed in plan view, and as a result, the coupling degree of the first line conductor and the second line conductor does not deviate.
[0003] Patent Document 1: Japanese Patent Application Publication No. 2000-165116
[0004] However, in the directional coupler described in Patent Document 1, in order to suppress the deviation of the coupling degree and adjust the impedance, the thickness of the substrate needs to be increased. SUMMARY
[0005] Therefore, an object of the present application is to provide a directional coupler that can suppress the deviation of the coupling degree and adjust the impedance without increasing the thickness of the substrate.
[0006] A directional coupler according to one embodiment of the present application includes a substrate having a plurality of dielectric layers, a main line provided on the substrate, a first sub-line provided on the substrate, and a ground conductor provided on the substrate. The main line has a first conductor path and a second conductor path that are electrically connected. The first sub-line has a third conductor path. The first conductor path and the second conductor path are disposed so as to be electromagnetically coupled to the third conductor path. The first conductor path and the second conductor path are disposed on different layers in the substrate. When a cross section of the substrate is viewed, the first conductor path, the second conductor path, the third conductor path, and the ground conductor are disposed in the order of the third conductor path, the first conductor path, the second conductor path, and the ground conductor. The first conductor path has a first end edge portion and a second end edge portion that extend in a length direction. The first end edge portion and the second end edge portion are opposed to each other. The second conductor path has a third end edge portion and a fourth end edge portion that extend in the length direction. The third end edge portion and the fourth end edge portion are opposed to each other. The third conductor path has a fifth end edge portion and a sixth end edge portion that extend in the length direction. The fifth end edge portion and the sixth end edge portion are opposed to each other. When the substrate is viewed in plan view, the first conductor path, the second conductor path, and the third conductor path are disposed so as to be arranged in the order of the first end edge portion, the fifth end edge portion, the third end edge portion, the second end edge portion, the sixth end edge portion, and the fourth end edge portion.
[0007] According to the present application, the deviation of the coupling degree can be suppressed and the impedance can be adjusted without increasing the thickness of the substrate. BRIEF DESCRIPTION OF DRAWINGS
[0008] Figure 1 is a sectional view showing one example of a substrate (directional coupler) according to Embodiment 1.
[0009] Figure 2 is a perspective view showing one example of a first conductor path, a second conductor path, and a third conductor path according to Embodiment 1.
[0010] Figure 3 is a plan view showing one example of a first conductor path, a second conductor path, and a third conductor path according to Embodiment 1.
[0011] Figure 4 is a perspective view showing one example of a first conductor path, a second conductor path, a third conductor path, a fourth conductor path, and a fifth conductor path according to Embodiment 1.
[0012] Figure 5 is a sectional view showing one example of a substrate (directional coupler) according to Embodiment 2.
[0013] Figure 6 is a perspective view showing one example of a first conductor path, a second conductor path, a third conductor path, and a sixth conductor path according to Embodiment 2.
[0014] Figure 7 is a circuit configuration view showing one example of a directional coupler according to Embodiment 2.
[0015] Figure 8 is a circuit configuration view showing one example of a directional coupler according to Embodiment 2.
[0016] Figure 9 is a circuit configuration view showing one example of a directional coupler according to Embodiment 2.
[0017] Explanation of Reference Signs
[0018] 1, 2 … Directional coupler; 5 … Substrate; 10 … Main line; 11 … First conductor path; 11a … First end edge portion; 11b … Second end edge portion; 12 … Second conductor path; 12a … Third end edge portion; 12b … Fourth end edge portion; 13 … Fourth conductor path; 14 … Fifth conductor path; 15 … First via conductor; 16 … Second via conductor; 20 … First sub line; 20a, 20b … Split sub line; 21 … Third conductor path; 21a … Fifth end edge portion; 21b … Sixth end edge portion; 30 … Ground conductor; 40 … Second sub line; 41 … Sixth conductor path; 41a … Seventh end edge portion; 41b … Eighth end edge portion; 50 … Phase circuit; 51 … First main surface; 52 … Second main surface; R1, R2 … Resistors; SW1, SW2 … Switches; t1, t2 … Input / output terminals; t3, t4 … Detection terminals. DETAILED DESCRIPTION
[0019] In the directional coupler described in Patent Literature 1, if the line width of the second line conductor is increased, the impedance of the second line conductor becomes small, and thus the distance between the ground conductor and the second line conductor, that is, the thickness of the substrate needs to be increased to adjust the impedance of the second line conductor. That is, in the directional coupler described in Patent Literature 1, in order to suppress the variation in the coupling factor and adjust the impedance, the thickness of the substrate needs to be increased.
[0020] Therefore, in the following, a directional coupler capable of suppressing the variation in the coupling factor and adjusting the impedance without increasing the thickness of the substrate will be described.
[0021] In the following, embodiments of the present application will be described in detail using the drawings. Furthermore, the embodiments described in the following each represent a general or specific example. The values, shapes, materials, constituent elements, arrangement of constituent elements, and connection methods and the like shown in the following embodiments are one example, and are not intended to limit the gist of the present application. Constituent elements not described in the independent claims among the constituent elements of the following embodiments are described as arbitrary constituent elements. In addition, the size or the ratio of the sizes of the constituent elements shown in the drawings is not necessarily strict. In addition, in each drawing, the same reference numerals are attached to substantially the same structures, and sometimes repeated description is omitted or simplified. In addition, in the following embodiments, "connection" includes not only the case of direct connection, but also the case of electrically connecting via other elements (for example, a capacitor, an inductor, or a semiconductor element such as a diode or a transistor, and the like). For example, "connected between A and B" means that it is connected to both A and B directly or via other elements.
[0022] (Embodiment 1)
[0023] Use Figures 1 to 4 Embodiment 1 will be described.
[0024] Figure 1 is a sectional view showing one example of the substrate 5 (directional coupler 1) according to Embodiment 1.
[0025] The directional coupler 1 includes the substrate 5, the main line 10 provided on the substrate 5, the first sub-line 20 provided on the substrate 5, and the ground conductor 30 provided on the substrate 5. With the directional coupler 1, it is possible to perform measurement of power or the like of a signal flowing through the main line 10 via the first sub-line 20, which is configured to be electromagnetically coupled with the main line 10.
[0026] The substrate 5 is, for example, a dielectric substrate having a plurality of dielectric layers. Between a first main surface 51 (e.g., a front surface) and a second main surface 52 (e.g., a back surface) of the substrate 5, a dielectric layer is formed, and a conductor such as a conductor wiring pattern or a conductor film is disposed on the first main surface 51, the second main surface 52, or within the dielectric layer so as to extend in a direction substantially parallel to the first main surface 51 and the second main surface 52. In addition, a conductor such as a via conductor is disposed so as to extend in a thickness direction of the substrate 5 (a direction substantially perpendicular to the first main surface 51 and the second main surface 52). As the various conductors of the substrate 5, for example, a metal having Al, Cu, Au, Ag, or an alloy thereof as a main component is used.
[0027] The main line 10 has a first conductor path 11 and a second conductor path 12 that are electrically connected. As will be described later, the end portions of the first conductor path 11 and the second conductor path 12 are connected to each other by a via conductor, whereby the first conductor path 11 and the second conductor path 12 are electrically connected. The first conductor path 11 and the second conductor path 12 are electrically connected, whereby one main line 10 is formed. Figure 2
[0028] The first sub-line 20 has a third conductor path 21. The first conductor path 11 and the second conductor path 12 are disposed so as to be electromagnetically coupled with the third conductor path 21. Further, the first conductor path 11 and the second conductor path 12 being disposed so as to be electromagnetically coupled with the third conductor path 21 means that, when the substrate 5 is viewed in plan, the third conductor path 21 overlaps at least a portion of the first conductor path 11, and the third conductor path 21 overlaps at least a portion of the second conductor path 12. In addition, the electromagnetic coupling can be capacitive coupling, can be magnetic field coupling, or can be both.
[0029] The ground conductor 30 is a conductor connected to a ground line. When the substrate 5 is viewed in plan, the ground conductor 30 is disposed so as to overlap at least a portion of the first conductor path 11, at least a portion of the second conductor path 12, and at least a portion of the third conductor path 21.
[0030] The first conductor path 11, the second conductor path 12, the third conductor path 21, and the ground conductor 30 are arranged in different layers in the substrate 5. Further, the first conductor path 11, the second conductor path 12, the third conductor path 21, and the ground conductor 30 being arranged in different layers in the substrate 5 means that the first conductor path 11, the second conductor path 12, the third conductor path 21, and the ground conductor 30 are arranged at different positions of the substrate 5 in the thickness direction of the substrate 5. Further, the ground conductor 30 can also be arranged on the second main surface 52. In addition, the third conductor path 21 can also be arranged on the first main surface 51. When observing a cross section of the substrate 5, the first conductor path 11, the second conductor path 12, the third conductor path 21, and the ground conductor 30 are arranged in the order of the third conductor path 21, the first conductor path 11, the second conductor path 12, and the ground conductor 30.
[0031] For example, the distance between the first conductor path 11 and the second conductor path 12 when observing a cross section of the substrate 5 is shorter than the distance between the first conductor path 11 and the third conductor path 21 when observing a cross section of the substrate 5. When the distance between the first conductor path 11 and the second conductor path 12 increases, the degree of coupling between the second conductor path 12 and the third conductor path 21 becomes low, and it becomes difficult to treat the first conductor path 11 and the second conductor path 12 as one main line 10 with respect to the third conductor path 21. In contrast, the distance between the first conductor path 11 and the second conductor path 12 is short, and thus it is possible to treat the first conductor path 11 and the second conductor path 12 as one main line 10 with respect to the third conductor path 21.
[0032] Next, the details of the first conductor path 11, the second conductor path 12, and the third conductor path 21 will be described using Figure 2 and Figure 3
[0033] Figure 2 is a perspective view showing one example of the first conductor path 11, the second conductor path 12, and the third conductor path 21 according to Embodiment 1. In Figure 2 , elements other than the first conductor path 11, the second conductor path 12, and the third conductor path 21 are not illustrated. Further, a via conductor connecting the first conductor path 11 and the second conductor path 12 is illustrated, and the via conductor is indicated by a broken line.
[0034] Figure 3 is a plan view showing one example of the first conductor path 11, the second conductor path 12, and the third conductor path 21 according to Embodiment 1. In Figure 3 , elements other than the first conductor path 11, the second conductor path 12, and the third conductor path 21 are not illustrated. In Figure 3 In FIG. 6, the first conductor path 11 is indicated by a dashed line, the second conductor path 12 is indicated by a dotted line, and the third conductor path 21 is indicated by a solid line. In addition, the first conductor path 11, the second conductor path 12, and the third conductor path 21 are made transparent when the substrate 5 is viewed from above, so that the positional relationship of the first conductor path 11, the second conductor path 12, and the third conductor path 21 can be understood.
[0035] For example, the first conductor path 11, the second conductor path 12, and the third conductor path 21 have a peripheral shape. For example, the first conductor path 11, the second conductor path 12, and the third conductor path 21 have a peripheral shape in which the inner and outer peripheries are substantially polygonal (here, substantially quadrangular). Alternatively, the first conductor path 11, the second conductor path 12, and the third conductor path 21 can have a circular peripheral shape.
[0036] The first conductor path 11 has a first end edge portion 11a and a second end edge portion 11b that extend in a length direction, and the first end edge portion 11a and the second end edge portion 11b are opposed to each other. The length direction is the direction in which the first conductor path 11 extends when the substrate 5 is viewed from above. The first end edge portion 11a and the second end edge portion 11b are edge portions of the first conductor path 11 in the length direction of the first conductor path 11. The first end edge portion 11a and the second end edge portion 11b can be end edge portions of a portion of the first conductor path 11, or can be end edge portions of the entire first conductor path 11. For example, in the case where the first conductor path 11 has a peripheral shape in which the inner and outer peripheries are substantially quadrangular, the first end edge portion 11a and the second end edge portion 11b can be end edge portions of one side of the substantially quadrangular shape, or can be end edge portions of all four sides of the substantially quadrangular shape. Alternatively, for example, in the case where the first conductor path 11 has a circular peripheral shape, the first end edge portion 11a and the second end edge portion 11b can be end edge portions of a portion of the circular periphery, or can be end edge portions of the entire circular periphery.
[0037] The second conductor path 12 has a third edge portion 12a and a fourth edge portion 12b extending in a length direction, and the third edge portion 12a and the fourth edge portion 12b are opposed to each other. The length direction is an extending direction of the second conductor path 12 when the substrate 5 is viewed in plan. The third edge portion 12a and the fourth edge portion 12b are edge portions of the second conductor path 12 in the length direction of the second conductor path 12. The third edge portion 12a and the fourth edge portion 12b can be edge portions of a part of the second conductor path 12, or can be edge portions of the entire second conductor path 12. For example, in a case where the second conductor path 12 has a peripheral shape in which an inner periphery and an outer periphery are substantially quadrangular, the third edge portion 12a and the fourth edge portion 12b can be edge portions of one side of the above-described substantially quadrangular shape, or can be edge portions of all four sides of the above-described substantially quadrangular shape. Further, for example, in a case where the second conductor path 12 has a circular peripheral shape, the third edge portion 12a and the fourth edge portion 12b can be edge portions of a part of the circular periphery, or can be edge portions of the entire circular periphery.
[0038] The third conductor path 21 has a fifth edge portion 21a and a sixth edge portion 21b extending in a length direction, and the fifth edge portion 21a and the sixth edge portion 21b are opposed to each other. The length direction is an extending direction of the third conductor path 21 when the substrate 5 is viewed in plan. The fifth edge portion 21a and the sixth edge portion 21b are edge portions of the third conductor path 21 in the length direction of the third conductor path 21. The fifth edge portion 21a and the sixth edge portion 21b can be edge portions of a part of the third conductor path 21, or can be edge portions of the entire third conductor path 21. For example, in a case where the third conductor path 21 has a peripheral shape in which an inner periphery and an outer periphery are substantially quadrangular, the fifth edge portion 21a and the sixth edge portion 21b can be edge portions of one side of the above-described substantially quadrangular shape, or can be edge portions of all four sides of the above-described substantially quadrangular shape. Further, for example, in a case where the third conductor path 21 has a circular peripheral shape, the fifth edge portion 21a and the sixth edge portion 21b can be edge portions of a part of the circular periphery, or can be edge portions of the entire circular periphery.
[0039] For example, the width of the first conductor path 11 and the width of the second conductor path 12 can also be different. For example, the width of the second conductor path 12 can also be narrower than the width of the first conductor path 11. By making the width of the second conductor path 12, which is disposed in the vicinity of the ground conductor 30, among the first conductor path 11 and the second conductor path 12, narrower, it is possible to shorten the distance between the ground conductor 30 and the second conductor path 12.
[0040] When the substrate 5 is viewed in plan, the first conductor path 11, the second conductor path 12, and the third conductor path 21 are disposed so as to be arranged in the order of the first edge portion 11a, the fifth edge portion 21a, the third edge portion 12a, the second edge portion 11b, the sixth edge portion 21b, and the fourth edge portion 12b (see FIG. 1). Figure 3). Specifically, the first conductor path 11 and the third conductor path 21 are configured such that, when the substrate 5 is viewed in plan, the first end edge portion 11a of the first conductor path 11 is located outside the fifth end edge portion 21a of the third conductor path 21, and the second end edge portion 11b of the first conductor path 11 is located outside the sixth end edge portion 21b of the third conductor path 21. In addition, the second conductor path 12 and the third conductor path 21 are configured such that, when the substrate 5 is viewed in plan, the fourth end edge portion 12b of the second conductor path 12 is located inside the sixth end edge portion 21b of the third conductor path 21, and the third end edge portion 12a of the second conductor path 12 is located inside the fifth end edge portion 21a of the third conductor path 21. Further, the fourth end edge portion 12b side among the first end edge portion 11a, the second end edge portion 11b, the third end edge portion 12a, the fourth end edge portion 12b, the fifth end edge portion 21a, and the sixth end edge portion 21b is referred to as the inner side, and the first end edge portion 11a side is referred to as the outer side. For example, in the case where each of the conductor paths has a coil shape, the inner side is the central side of the winding of each of the conductor paths, and the outer side is the opposite side thereof.
[0041] Further, when the substrate 5 is viewed in plan, the first end edge portion 11a, the fifth end edge portion 21a, the third end edge portion 12a, the second end edge portion 11b, the sixth end edge portion 21b, and the fourth end edge portion 12b can be arranged in this order not over the entire length of the first conductor path 11, the second conductor path 12, and the third conductor path 21. That is, when the substrate 5 is viewed in plan, the portions in which the first end edge portion 11a, the fifth end edge portion 21a, the third end edge portion 12a, the second end edge portion 11b, the sixth end edge portion 21b, and the fourth end edge portion 12b are arranged in this order can exist in the first conductor path 11, the second conductor path 12, and the third conductor path 21.
[0042] Further, the main line 10 can further include a fourth conductor path 13 and a fifth conductor path 14. The fourth conductor path 13 and the fifth conductor path 14 are configured such that, when the substrate 5 is viewed in plan, the fourth conductor path 13 and the fifth conductor path 14 are arranged in this order. Figure 4 This will be described.
[0043] Figure 4 is a perspective view showing one example of the first conductor path 11, the second conductor path 12, the third conductor path 21, the fourth conductor path 13, and the fifth conductor path 14 according to Embodiment 1. In Figure 4 , the constituent elements other than the first conductor path 11, the second conductor path 12, the third conductor path 21, the fourth conductor path 13, and the fifth conductor path 14 are not shown. Further, a via conductor connecting the first conductor path 11 and the second conductor path 12, a plurality of first via conductors 15 connecting the first conductor path 11 and the fourth conductor path 13, and a plurality of second via conductors 16 connecting the second conductor path 12 and the fifth conductor path 14 are shown, and these via conductors are indicated by broken lines.
[0044] The fourth conductor path 13 is disposed between the third conductor path 21 and the first conductor path 11 when observing the cross section of the substrate 5. For example, the fourth conductor path 13 is substantially the same shape as the first conductor path 11, and is disposed so that the first conductor path 11 and the fourth conductor path 13 mostly overlap when observing the substrate 5 from above. The first conductor path 11 and the fourth conductor path 13 are connected by a plurality (more) of first via conductors 15. Thus, the first conductor path 11 and the fourth conductor path 13 can be regarded as one conductor path with a greater thickness.
[0045] The fifth conductor path 14 is disposed between the second conductor path 12 and the ground conductor 30 when observing the cross section of the substrate 5. For example, the fifth conductor path 14 is substantially the same shape as the second conductor path 12, and is disposed so that the second conductor path 12 and the fifth conductor path 14 mostly overlap when observing the substrate 5 from above. The second conductor path 12 and the fifth conductor path 14 are connected by a plurality (more) of second via conductors 16. Thus, the second conductor path 12 and the fifth conductor path 14 can be regarded as one conductor path with a greater thickness.
[0046] As described above, the directional coupler 1 includes the substrate 5 having a plurality of dielectric layers, the main line 10 disposed on the substrate 5, the first sub-line 20 disposed on the substrate 5, and the ground conductor 30 disposed on the substrate 5. The main line 10 has the first conductor path 11 and the second conductor path 12 electrically connected, and the first sub-line 20 has the third conductor path 21. The first conductor path 11 and the second conductor path 12 are disposed so as to be electromagnetically coupled with the third conductor path 21. The first conductor path 11 and the second conductor path 12 are disposed on different layers in the substrate 5. When observing the cross section of the substrate 5, the first conductor path 11, the second conductor path 12, the third conductor path 21, and the ground conductor 30 are disposed in the order of the third conductor path 21, the first conductor path 11, the second conductor path 12, and the ground conductor 30. The first conductor path 11 has a first end edge portion 11a and a second end edge portion 11b extending in the length direction, the first end edge portion 11a and the second end edge portion 11b being opposed to each other, the second conductor path 12 has a third end edge portion 12a and a fourth end edge portion 12b extending in the length direction, the third end edge portion 12a and the fourth end edge portion 12b being opposed to each other, and the third conductor path 21 has a fifth end edge portion 21a and a sixth end edge portion 21b extending in the length direction, the fifth end edge portion 21a and the sixth end edge portion 21b being opposed to each other. When observing the substrate 5 from above, the first conductor path 11, the second conductor path 12, and the third conductor path 21 are disposed so as to be arranged in the order of the first end edge portion 11a, the fifth end edge portion 21a, the third end edge portion 12a, the second end edge portion 11b, the sixth end edge portion 21b, and the fourth end edge portion 12b.
[0047] Thus, when the substrate 5 is viewed in plan, the first end edge portion 11a of the first conductor path 11 is located outside the fifth end edge portion 21a of the third conductor path 21, and the second end edge portion 11b of the first conductor path 11 is located outside the sixth end edge portion 21b of the third conductor path 21, so when the substrate 5 is viewed in plan, the third conductor path 21 overlaps the first conductor path 11 in a state in which the sixth end edge portion 21b of the third conductor path 21 protrudes from the second end edge portion 11b of the first conductor path 11. Also, when the substrate 5 is viewed in plan, the fourth end edge portion 12b of the second conductor path 12 is located inside the sixth end edge portion 21b of the third conductor path 21, and the third end edge portion 12a of the second conductor path 12 is located inside the fifth end edge portion 21a of the third conductor path 21, so when the substrate 5 is viewed in plan, the third conductor path 21 overlaps the second conductor path 12 in a state in which the fifth end edge portion 21a of the third conductor path 21 protrudes from the third end edge portion 12a of the second conductor path 12. That is, when the substrate 5 is viewed in plan, the first conductor path 11 overlaps the second conductor path 12, and the third conductor path 21 overlaps both the first conductor path 11 and the second conductor path 12 in a state in which the third conductor path 21 does not protrude from the first conductor path 11 and the second conductor path 12, so it is possible to adjust the impedance without making the line width of the first conductor path 11 and the second conductor path 12 wider than the line width of the third conductor path 21.
[0048] Thus, it is possible to adjust the impedance without making the line width of the first conductor path 11 and the second conductor path 12 wider than the line width of the third conductor path 21, and it is also possible to adjust the impedance without making the distance between the ground conductor 30 and the main line 10, i.e., the thickness of the substrate 5, larger.
[0049] Also, the line width of the main line 10 when the substrate 5 is viewed in plan can be considered to be the width from the first end edge portion 11a of the first conductor path 11 to the fourth end edge portion 12b of the second conductor path 12. Thus, even if the substrate 5 is shifted in layers, the third conductor path 21 is shifted to the fifth end edge portion 21a side or to the sixth end edge portion 21b side, it is possible to make the third conductor path 21 not protrude from the main line 10 when the substrate 5 is viewed in plan. Thus, it is possible to make the degree of coupling of the main line 10 and the first sub line 20 not deviate.
[0050] Thus, it is possible to adjust the impedance without making the thickness of the substrate 5 larger.
[0051] For example, the distance between the first conductor path 11 and the second conductor path 12 when the substrate 5 is viewed in cross section can be shorter than the distance between the first conductor path 11 and the third conductor path 21 when the substrate 5 is viewed in cross section.
[0052] The first conductor path 11 and the second conductor path 12 are short in distance from the third conductor path 21, and thus the first conductor path 11 and the second conductor path 12 can be treated as one main line 10 which is wide in line width.
[0053] For example, the width of the first conductor path 11 and the width of the second conductor path 12 can also be different.
[0054] Thus, the width of the first conductor path 11 and the width of the second conductor path 12 can also not be designed to be uniform.
[0055] For example, the width of the second conductor path 12 can also be narrower than the width of the first conductor path 11.
[0056] By narrowing the width of the second conductor path 12 of the first conductor path 11 and the second conductor path 12 which is disposed in the vicinity of the ground conductor 30, the distance between the ground conductor 30 and the second conductor path 12 can be shortened, and thus the low profile of the substrate 5 can be achieved.
[0057] For example, the main line 10 can also have a fourth conductor path 13 and a fifth conductor path 14. The fourth conductor path 13 is disposed between the third conductor path 21 and the first conductor path 11 when the cross section of the substrate 5 is observed, and the fifth conductor path 14 is disposed between the second conductor path 12 and the ground conductor 30 when the cross section of the substrate 5 is observed. The first conductor path 11 and the fourth conductor path 13 can be connected by a plurality of first via conductors 15, and the second conductor path 12 and the fifth conductor path 14 can be connected by a plurality of second via conductors 16.
[0058] Thus, the first conductor path 11 and the fourth conductor path 13 can be regarded as one conductor path which is thick, and the second conductor path 12 and the fifth conductor path 14 can be regarded as one conductor path which is thick. Thus, the loss in the main line 10 which is composed of the first conductor path 11 and the fourth conductor path 13 and the second conductor path 12 and the fifth conductor path 14 can be improved.
[0059] (Embodiment 2)
[0060] Use Figures 5 to 9 Embodiment 2 will be described.
[0061] Figure 5 is a cross-sectional view showing one example of the substrate 5 (directional coupler 2) according to Embodiment 2.
[0062] The directional coupler 2 has a substrate 5, a main line 10 provided to the substrate 5, a first sub line 20 provided to the substrate 5, a second sub line 40 provided to the substrate 5, and a ground conductor 30 provided to the substrate 5. With the directional coupler 2, it is possible to perform measurement of power and the like of a signal flowing through the main line 10 via the first sub line 20 and the second sub line 40, which are configured to be electromagnetically coupled with the main line 10. The directional coupler 2 is different from the directional coupler 1 in Embodiment 1 in that it further has the second sub line 40. Other aspects are the same as in Embodiment 1, and thus the description is omitted.
[0063] The second sub line 40 has a sixth conductor path 41. The first conductor path 11 and the second conductor path 12 are configured to be electromagnetically coupled with the sixth conductor path 41. Further, the first conductor path 11 and the second conductor path 12 being configured to be electromagnetically coupled with the sixth conductor path 41 means that, when the substrate 5 is viewed in plan, the sixth conductor path 41 overlaps at least a portion of the first conductor path 11, and the sixth conductor path 41 overlaps at least a portion of the second conductor path 12. In addition, the electromagnetic coupling can be capacitive coupling, can be magnetic field coupling, or can be both.
[0064] When a cross section of the substrate 5 is viewed, the sixth conductor path 41 is disposed between the second conductor path 12 and the ground conductor 30. That is, when a cross section of the substrate 5 is viewed, the first conductor path 11, the second conductor path 12, the third conductor path 21, the sixth conductor path 41, and the ground conductor 30 are disposed in the order of the third conductor path 21, the first conductor path 11, the second conductor path 12, the sixth conductor path 41, and the ground conductor 30.
[0065] For example, a distance between the first conductor path 11 and the second conductor path 12 when a cross section of the substrate 5 is viewed is shorter than a distance between the second conductor path 12 and the sixth conductor path 41 when a cross section of the substrate 5 is viewed. For example, as the distance between the first conductor path 11 and the second conductor path 12 increases, the degree of coupling between the first conductor path 11 and the sixth conductor path 41 decreases, and it becomes difficult to treat the first conductor path 11 and the second conductor path 12 as one main line 10 with respect to the sixth conductor path 41. In contrast, the distance between the first conductor path 11 and the second conductor path 12 is short, and thus it is possible to treat the first conductor path 11 and the second conductor path 12 as one main line 10 with respect to the sixth conductor path 41.
[0066] Next, the use of the directional coupler 2 will be described. Figure 6 The details of the sixth conductor path 41 will be described.
[0067] Figure 6 is a perspective view showing one example of the first conductor path 11, the second conductor path 12, the third conductor path 21, and the sixth conductor path 41 according to Embodiment 2. In Figure 6In the drawing, the first conductor path 11, the second conductor path 12, the third conductor path 21, and the sixth conductor path 41 are not illustrated. Further, a via conductor connecting the first conductor path 11 and the second conductor path 12 is illustrated by a broken line.
[0068] For example, the sixth conductor path 41 has a peripheral shape. For example, the sixth conductor path 41 has a peripheral shape in which an inner periphery and an outer periphery are substantially polygonal (here, substantially quadrangular). Further, the sixth conductor path 41 can have a circular peripheral shape.
[0069] The sixth conductor path 41 has a seventh end edge portion 41a and an eighth end edge portion 41b extending in a length direction, and the seventh end edge portion 41a and the eighth end edge portion 41b are opposed to each other. The length direction is a direction in which the sixth conductor path 41 extends when the substrate 5 is viewed from above. The seventh end edge portion 41a and the eighth end edge portion 41b are edge portions of the sixth conductor path 41 in the length direction of the sixth conductor path 41. The seventh end edge portion 41a and the eighth end edge portion 41b can be end edge portions of a portion of the sixth conductor path 41, or can be end edge portions of the entire sixth conductor path 41. For example, in a case where the sixth conductor path 41 has a peripheral shape in which an inner periphery and an outer periphery are substantially quadrangular, the seventh end edge portion 41a and the eighth end edge portion 41b can be end edge portions of one side of the above-described substantially quadrangular shape, or can be end edge portions of all four sides of the above-described substantially quadrangular shape. Further, for example, in a case where the sixth conductor path 41 has a circular peripheral shape, the seventh end edge portion 41a and the eighth end edge portion 41b can be end edge portions of a portion of the circular periphery, or can be end edge portions of the entire circular periphery.
[0070] In a plan view of the substrate 5, the first conductor path 11, the second conductor path 12, and the sixth conductor path 41 are arranged in the order of the first end edge portion 11a, the seventh end edge portion 41a, the third end edge portion 12a, the second end edge portion 11b, the eighth end edge portion 41b, and the fourth end edge portion 12b. Specifically, the first conductor path 11 and the sixth conductor path 41 are arranged such that, in a plan view of the substrate 5, the first end edge portion 11a of the first conductor path 11 is located outside the seventh end edge portion 41a of the sixth conductor path 41, and the second end edge portion 11b of the first conductor path 11 is located outside the eighth end edge portion 41b of the sixth conductor path 41. In addition, the second conductor path 12 and the sixth conductor path 41 are arranged such that, in a plan view of the substrate 5, the fourth end edge portion 12b of the second conductor path 12 is located inside the eighth end edge portion 41b of the sixth conductor path 41, and the third end edge portion 12a of the second conductor path 12 is located inside the seventh end edge portion 41a of the sixth conductor path 41. Further, the fourth end edge portion 12b side among the first end edge portion 11a, the second end edge portion 11b, the third end edge portion 12a, the fourth end edge portion 12b, the seventh end edge portion 41a, and the eighth end edge portion 41b is referred to as the inside, and the first end edge portion 11a side is referred to as the outside. For example, in the case where each of the conductor paths has a circular shape, the inside is the central side of the winding of each of the conductor paths, and the outside is the opposite side thereof. Further, the positional relationship between the first conductor path 11, the second conductor path 12, and the sixth conductor path 41 in a plan view of the substrate 5 is the same as the positional relationship between the first conductor path 11 and the second conductor path 12 and the third conductor path 21 shown in FIG. 1, and thus the illustration thereof is omitted. Figure 3 The positional relationship between the first conductor path 11 and the second conductor path 12 and the third conductor path 21 shown in FIG. 1 is the same as the positional relationship between the first conductor path 11 and the second conductor path 12 and the sixth conductor path 41 in a plan view of the substrate 5, and thus the illustration thereof is omitted.
[0071] Further, in a plan view of the substrate 5, the first conductor path 11, the second conductor path 12, and the sixth conductor path 41 can be arranged in the order of the first end edge portion 11a, the seventh end edge portion 41a, the third end edge portion 12a, the second end edge portion 11b, the eighth end edge portion 41b, and the fourth end edge portion 12b. That is, in a plan view of the substrate 5, the first conductor path 11, the second conductor path 12, and the sixth conductor path 41 can be arranged in the order of the first end edge portion 11a, the seventh end edge portion 41a, the third end edge portion 12a, the second end edge portion 11b, the eighth end edge portion 41b, and the fourth end edge portion 12b.
[0072] Further, in Embodiment 2, the main line 10 can further include a fourth conductor path 13 and a fifth conductor path 14.
[0073] Here, the use of the fourth conductor path 13 and the fifth conductor path 14 is not limited to the above-described example. For example, the fourth conductor path 13 and the fifth conductor path 14 can be used as a conductor path for a different purpose from the above-described example. Figures 7 to 9 A circuit structure example of the directional coupler 2 will be described.
[0074] Figures 7 to 9 is a circuit structure diagram showing one example of the directional coupler 2 according to Embodiment 2. In the circuit structure shown in FIG. 2, the first conductor path 11, the second conductor path 12, and the third conductor path 21 are arranged in the order of the first end edge portion 11a, the third end edge portion 12a, the second end edge portion 11b, and the fourth end edge portion 12b. Specifically, the first conductor path 11 and the second conductor path 12 are arranged such that, in a plan view of the substrate 5, the first end edge portion 11a of the first conductor path 11 is located outside the third end edge portion 12a of the second conductor path 12, and the second end edge portion 11b of the first conductor path 11 is located outside the fourth end edge portion 12b of the second conductor path 12. In addition, the first conductor path 11 and the third conductor path 21 are arranged such that, in a plan view of the substrate 5, the first end edge portion 11a of the first conductor path 11 is located inside the third end edge portion 12a of the third conductor path 21, and the second end edge portion 11b of the first conductor path 11 is located inside the fourth end edge portion 12b of the third conductor path 21. Further, the fourth end edge portion 12b side among the first end edge portion 11a, the second end edge portion 11b, the third end edge portion 12a, and the fourth end edge portion 12b is referred to as the inside, and the first end edge portion 11a side is referred to as the outside. For example, in the case where each of the conductor paths has a circular shape, the inside is the central side of the winding of each of the conductor paths, and the outside is the opposite side thereof. Further, the positional relationship between the first conductor path 11, the second conductor path 12, and the third conductor path 21 in a plan view of the substrate 5 is the same as the positional relationship between the first conductor path 11 and the second conductor path 12 and the third conductor path 21 shown in FIG. 1, and thus the illustration thereof is omitted. Figures 7 to 9The input and output terminals t1 and t2 and the detection terminals t3 and t4 are shown in Figure 9 The detection terminals t4 are also shown in
[0075] One end of the main line 10 is connected to the input and output terminal t1, and the other end of the main line 10 is connected to the input and output terminal t2. Thereby, a signal input to the input and output terminal t1 is output from the input and output terminal t2 via the main line 10. Or, a signal input to the input and output terminal t2 is output from the input and output terminal t1 via the main line 10.
[0076] First, the circuit structure example shown in Figure 7 will be described.
[0077] As shown in Figure 7 , the directional coupler 2 can also be provided with a switch SW1. The switch SW1 can be a SPDT (Single Pole Double Throw) switch having a common terminal and two selection terminals. One end of the first sub-line 20 is connected to the detection terminal t3, and the other end of the first sub-line 20 is connected to the common terminal of the switch SW1. One end of the second sub-line 40 is connected to one of the two selection terminals of the switch SW1, and the other end of the second sub-line 40 is connected to the resistance R1. The resistance R1 is, for example, a terminal resistance of 50 Ω or the like. The other of the two selection terminals of the switch SW1 is connected to the resistance R2. The resistance R2 is, for example, a terminal resistance of 50 Ω or the like.
[0078] The switch SW1 is a switch that switches the connection of the first sub-line 20 and the second sub-line 40. Specifically, the switch SW1 switches between a state in which the first sub-line 20 and the second sub-line 40 are connected, and a state in which the first sub-line 20 and the second sub-line 40 are not connected. The switch SW1 connects the first sub-line 20 and the resistance R2 in the state in which the first sub-line 20 and the second sub-line 40 are not connected.
[0079] In the state in which the first sub-line 20 and the second sub-line 40 are connected, the sub-lines used when the power or the like of the signal flowing through the main line 10 is measured are the first sub-line 20 and the second sub-line 40, and in the state in which the first sub-line 20 and the second sub-line 40 are not connected, the sub-line used when the power or the like of the signal flowing through the main line 10 is measured is only the first sub-line 20. In this way, since the length of the sub-line can be switched by the switch SW1, the directional coupler 2 can be applied to multiple frequency bands.
[0080] Next, the circuit structure example shown in Figure 8The circuit structure shown is illustrated in the example.
[0081] like Figure 8 As shown, the directional coupler 2 may also include a phase circuit 50 connected between the first sub-line 20 and the second sub-line 40. One end of the first sub-line 20 is connected to the detection terminal t3, and the other end of the first sub-line 20 is connected to one end of the phase circuit 50. One end of the second sub-line 40 is connected to the other end of the phase circuit 50, and the other end of the second sub-line 40 is connected to a resistor R1. The phase circuit 50 functions as a low-pass filter.
[0082] The higher the frequency of the signal flowing through the main line 10, the higher the coupling between the main line 10 and the first auxiliary line 20 and the second auxiliary line 40. Therefore, high-frequency signals are more likely to leak from the main line 10 to the first auxiliary line 20 and the second auxiliary line 40. However, the phase circuit 50 connects the first auxiliary line 20 and the second auxiliary line 40 by adjusting their phases, thus making it less likely for high-frequency signals to leak from the main line 10 to the first auxiliary line 20 and the second auxiliary line 40. Therefore, the directional coupler 2 can be applied to a wide bandwidth.
[0083] Next, for Figure 9 The circuit structure shown is illustrated in the example.
[0084] like Figure 9 As shown, the directional coupler 2 may also include a phase circuit 50 and a switch SW2. The switch SW2 may be a SPDT switch with a common terminal and two select terminals. For example, the first sub-line 20 is composed of separate sub-lines 20a and 20b. The phase circuit 50 is connected between the first sub-line 20 (specifically, separate sub-line 20b) and the second sub-line 40. One end of separate sub-line 20a is connected to the detection terminal t3, and the other end of separate sub-line 20a is connected to one of the select terminals of the switch SW2. One end of separate sub-line 20b is connected to the common terminal of the switch SW2, and the other end of separate sub-line 20b is connected to one end of the phase circuit 50. One end of the second sub-line 40 is connected to the other end of the phase circuit 50, and the other end of the second sub-line 40 is connected to a resistor R1. The other select terminal of the two select terminals of the switch SW2 is connected to the detection terminal t4.
[0085] The switch SW2 is a switch that switches the length of the first sub-line 20. Specifically, the switch SW2 switches the connection of the split sub-line 20a and the split sub-line 20b. More specifically, the switch SW2 switches between a state in which the split sub-line 20a and the split sub-line 20b are connected and a state in which the split sub-line 20a and the split sub-line 20b are not connected. The switch SW2 connects the split sub-line 20b and the detection terminal t4 in the state in which the split sub-line 20a and the split sub-line 20b are not connected.
[0086] In the state in which the split sub-line 20a and the split sub-line 20b are connected, the sub-lines used at the time of measuring the power and the like of the signal flowing through the main line 10 are the split sub-lines 20a and 20b and the second sub-line 40, and in the state in which the split sub-line 20a and the split sub-line 20b are not connected, the sub-lines used at the time of measuring the power and the like of the signal flowing through the main line 10 are the split sub-line 20b and the second sub-line 40. In addition, the phase circuit 50 connects the first sub-line 20 and the second sub-line 40 by adjusting the phases of the first sub-line 20 (specifically, the split sub-line 20b) and the second sub-line 40, thereby making it difficult for a signal of a high frequency to leak from the main line 10 to the first sub-line 20 and the second sub-line 40. Thus, it is possible to apply the directional coupler 2 to a multi-band and a wide band. For example, in the case of application to an LB (Low Band), the split sub-line 20a and the split sub-line 20b are connected by the switch SW2, and the power and the like of the signal of the LB flowing through the main line 10 are measured from the detection terminal t3. For example, in the case of application to an HB (High Band), the split sub-line 20b and the detection terminal t4 are connected by the switch SW2, and the power and the like of the signal of the HB flowing through the main line 10 are measured from the detection terminal t4.
[0087] As described above, the directional coupler 2 further includes the second sub-line 40. The second sub-line 40 includes a sixth conductor path 41. The first conductor path 11 and the second conductor path 12 are arranged so as to be electromagnetically coupled with the sixth conductor path 41. When a cross section of the substrate 5 is observed, the sixth conductor path 41 is arranged between the second conductor path 12 and the ground conductor 30. The sixth conductor path 41 includes a seventh end edge portion 41a and an eighth end edge portion 41b that extend in the length direction and are opposed to each other. When the substrate 5 is observed from above, the first conductor path 11, the second conductor path 12, and the sixth conductor path 41 are arranged so as to be arranged in the order of the first end edge portion 11a, the seventh end edge portion 41a, the third end edge portion 12a, the second end edge portion 11b, the eighth end edge portion 41b, and the fourth end edge portion 12b.
[0088] Thus, as with the first sub-line 20, the degree of coupling of the main line 10 and the second sub-line 40 can be made uniform without increasing the thickness of the substrate 5. In addition, the main line 10 is disposed between the first sub-line 20 and the second sub-line 40, and when the substrate 5 is viewed in plan, the first sub-line 20 and the second sub-line 40 are each disposed so as not to protrude from the main line 10, and thus the isolation of the first sub-line 20 and the second sub-line 40 can be improved. Thus, the directivity of the directional coupler 2 can be improved.
[0089] For example, the distance between the first conductor path 11 and the second conductor path 12 when the substrate 5 is viewed in cross section can also be shorter than the distance between the second conductor path 12 and the sixth conductor path 41 when the substrate 5 is viewed in cross section.
[0090] The distance between the first conductor path 11 and the second conductor path 12 is short, and thus the first conductor path 11 and the second conductor path 12 can be handled as one main line 10 having a wide line width with respect to the sixth conductor path 41.
[0091] For example, the directional coupler 2 can also further include a switch SW1 that switches the connection of the first sub-line 20 and the second sub-line 40.
[0092] Thus, the length of the sub-line can be switched by the switch SW1, and thus the directional coupler 2 can be applied to multiple frequency bands.
[0093] For example, the directional coupler 2 can also further include a phase circuit 50 connected between the first sub-line 20 and the second sub-line 40.
[0094] The higher the frequency of the signal flowing through the main line 10, the higher the degree of coupling of the main line 10 and the first sub-line 20 and the second sub-line 40. Thus, a signal of a high frequency easily leaks from the main line 10 to the first sub-line 20 and the second sub-line 40, and the loss of the main line 10 becomes large for a signal of a high frequency. In contrast, the phase circuit 50 connects the first sub-line 20 and the second sub-line 40 by adjusting the phase of the first sub-line 20 and the second sub-line 40, and thus a signal of a high frequency does not easily flow to the first sub-line 20 and the second sub-line 40, that is, a signal of a high frequency does not easily leak from the main line 10 to the first sub-line 20 and the second sub-line 40. Thus, the directional coupler 2 can be applied to a wide frequency band.
[0095] For example, the directional coupler 2 can also further include a switch SW2 that switches the length of the first sub-line 20.
[0096] Thus, the directional coupler 2 can be applied to multiple frequency bands and a wide frequency band.
[0097] (Other Embodiments)
[0098] The directional coupler 1, 2 according to the present application is not limited to the above-described embodiments. Other embodiments realized by combining any of the constituent elements of the above-described embodiments, modified examples obtained by various modifications made by those skilled in the art within the scope of the above-described embodiments without departing from the gist of the present application, and various devices in which the directional coupler 1, 2 according to the present application is built-in are also included in the present application.
[0099] In the above-described embodiments, an example in which the distance between the first conductor path 11 and the second conductor path 12 when observing the cross section of the substrate 5 is shorter than the distance between the first conductor path 11 and the third conductor path 21 when observing the cross section of the substrate 5 is described, but is not limited thereto. For example, the distance between the first conductor path 11 and the second conductor path 12 when observing the cross section of the substrate 5 can be longer than the distance between the first conductor path 11 and the third conductor path 21 when observing the cross section of the substrate 5.
[0100] In the above-described embodiments, an example in which the width of the second conductor path 12 is narrower than the width of the first conductor path 11 is described, but for example, the width of the second conductor path 12 can be wider than the width of the first conductor path 11.
[0101] In the above-described embodiments, an example in which the width of the first conductor path 11 and the width of the second conductor path 12 are different is described, but for example, the width of the first conductor path 11 and the width of the second conductor path 12 can be substantially the same.
[0102] In the above-described embodiments, an example in which the distance between the first conductor path 11 and the second conductor path 12 when observing the cross section of the substrate 5 is shorter than the distance between the second conductor path 12 and the sixth conductor path 41 when observing the cross section of the substrate 5 is described, but is not limited thereto. For example, the distance between the first conductor path 11 and the second conductor path 12 when observing the cross section of the substrate 5 can be longer than the distance between the second conductor path 12 and the sixth conductor path 41 when observing the cross section of the substrate 5.
[0103] For example, the directional coupler 2 can also be a bidirectional coupler. For example, the first sub-line 20 can be used when detecting the power or the like of the signal flowing through the main line 10 from the input-output terminal tl side to the input-output terminal t2 side, and the second sub-line 40 can be used when detecting the power or the like of the signal flowing through the main line 10 from the input-output terminal t2 side to the input-output terminal tl side.
[0104]
[0105] The present application can be widely used for a directional coupler for monitoring a high-frequency signal in a communication device such as a mobile phone.
Claims
1. A directional coupler, wherein, have: The substrate has multiple dielectric layers; The main circuit is disposed on the substrate; The first circuit is disposed on the substrate; as well as A grounding conductor is disposed on the substrate. The main line has a first conductor path and a second conductor path that are electrically connected. The first auxiliary line has a third conductor path. The first conductor path, the second conductor path, and the third conductor path are configured to be electromagnetically coupled. The first conductor path and the second conductor path are disposed in different layers of the substrate. When observing the cross-section of the substrate, the first conductor path, the second conductor path, the third conductor path, and the ground conductor are arranged in the order of the third conductor path, the first conductor path, the second conductor path, and the ground conductor. The first conductor has a first end edge and a second end edge extending along its length, the first end edge and the second end edge being opposite each other. The second conductor has a third end edge and a fourth end edge extending along its length, the third end edge and the fourth end edge being opposite each other. The third conductor has a fifth end edge and a sixth end edge extending along its length, the fifth end edge and the sixth end edge being opposite each other. When the substrate is viewed from above, the first conductor, the second conductor, and the third conductor are arranged in the order of the first end edge, the fifth end edge, the third end edge, the second end edge, the sixth end edge, and the fourth end edge.
2. The directional coupler according to claim 1, wherein, The distance between the first conductor path and the second conductor path when observing the cross-section of the substrate is shorter than the distance between the first conductor path and the third conductor path when observing the cross-section of the substrate.
3. The directional coupler according to claim 1 or 2, wherein, The width of the first conductor path is different from the width of the second conductor path.
4. The directional coupler according to claim 3, wherein, The width of the second conductor path is narrower than the width of the first conductor path.
5. The directional coupler according to claim 1 or 2, wherein, The main line also has a fourth conductor path and a fifth conductor path. When observing the cross-section of the substrate, the fourth conductor path is disposed between the third conductor path and the first conductor path. When observing the cross-section of the substrate, the fifth conductor path is positioned between the second conductor path and the ground conductor. The first conductor path and the fourth conductor path are connected through a plurality of first through-hole conductors. The second conductor path and the fifth conductor path are connected through a plurality of second through-hole conductors.
6. The directional coupler according to claim 1 or 2, wherein, The directional coupler also has a second circuit. The second auxiliary line has a sixth conductor path. The first conductor path, the second conductor path, and the sixth conductor path are configured to be electromagnetically coupled. When observing the cross-section of the substrate, the sixth conductor path is positioned between the second conductor path and the ground conductor. The sixth conductor has a seventh end edge and an eighth end edge extending along its length, the seventh end edge and the eighth end edge being opposite each other. When the substrate is viewed from above, the first conductor, the second conductor, and the sixth conductor are arranged in the order of the first end edge, the seventh end edge, the third end edge, the second end edge, the eighth end edge, and the fourth end edge.
7. The directional coupler according to claim 6, wherein, The distance between the first conductor path and the second conductor path when observing the cross-section of the substrate is shorter than the distance between the second conductor path and the sixth conductor path when observing the cross-section of the substrate.
8. The directional coupler according to claim 6, wherein, The directional coupler also includes a switch. The switch switches the connection between the first auxiliary line and the second auxiliary line.
9. The directional coupler according to claim 6, wherein, The directional coupler also includes a phase circuit. The phase circuit is connected between the first secondary line and the second secondary line.
10. The directional coupler according to claim 9, wherein, The directional coupler also includes a switch. The switch changes the length of the first secondary line.