A directional coupler and electronic device

Abstract

A directional coupler and an electronic device are provided. The directional coupler of the technical solution comprises a dielectric substrate and a transmission line structure arranged on a surface of the dielectric substrate, the transmission line structure comprising an input port, a through port, an isolation port, a coupling port, a first channel transmission line formed between the input port and the through port, a second channel transmission line formed between the isolation port and the coupling port, a first branch transmission line formed between the input port and the isolation port, and a second branch transmission line formed between the through port and the coupling port; at least one of the first channel transmission line, the second channel transmission line, the first branch transmission line and the second branch transmission line has a branch structure extending to both sides along the surface of the dielectric substrate. The technical solution can realize miniaturization of the directional coupler to a greater extent, and can also ensure the working bandwidth of the coupler by tuning the inductive component and the capacitive component.

Description

Technical Field

[0001] This disclosure relates to the field of microwave technology, and more particularly to a directional coupler and electronic device. Background Technology

[0002] Directional couplers are a crucial component in satellite communication technology, serving as core devices in microwave and millimeter-wave communication systems. The lower the operating frequency of a directional coupler, the larger its size. With the increasing demand for miniaturization in microwave systems, and the fact that the operating bandwidth of directional couplers limits their application, researching broadband, miniaturized directional couplers is of significant practical importance.

[0003] Branch-line directional couplers are widely used in microwave integrated circuits and monolithic integrated circuits. Traditional branch-line directional couplers, such as the 3dB branch-line directional coupler, consist of four quarter-wavelength transmission lines. However, this architecture of traditional branch-line directional couplers occupies a considerable amount of printed circuit board (PCB) area. Summary of the Invention

[0004] Providing a mechanism to alleviate, reduce or eliminate at least one of the above problems would be beneficial.

[0005] In a first aspect, a directional coupler is provided. The directional coupler includes: a dielectric substrate and a transmission line structure disposed on the surface of the dielectric substrate. The transmission line structure includes: an input port; a through port; an isolation port; a coupling port; a first channel transmission line formed between the input port and the through port; a second channel transmission line formed between the isolation port and the coupling port; a first branch transmission line formed between the input port and the isolation port; and a second branch transmission line formed between the through port and the coupling port; wherein at least one of the first channel transmission line, the second channel transmission line, the first branch transmission line, and the second branch transmission line has a branch structure extending laterally along the surface of the dielectric substrate.

[0006] Secondly, an electronic device is provided. This electronic device includes the aforementioned directional coupler.

[0007] According to exemplary embodiments of this disclosure, the present technical solution simultaneously designs branch structures on both sides of the transmission line of the directional coupler, providing more wiring space for the transmission line through the branch structures on both sides, and shortening the transmission line length by loading larger inductive and capacitive components, thereby achieving a greater degree of miniaturization. At the same time, the present technical solution can also ensure the operating bandwidth of the coupler by tuning the inductive and capacitive components.

[0008] It should be understood that the summary section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0009] The above and other objects, features, and advantages of this disclosure will become more apparent from the more detailed description of some embodiments thereof in the accompanying drawings, in which:

[0010] Figure 1 A schematic diagram of the structure of a directional coupler in which exemplary embodiments of the present disclosure may be implemented is shown;

[0011] Figure 2 A schematic diagram of the transmission line structure of a directional coupler according to some embodiments of the present disclosure is shown;

[0012] Figure 3 A schematic diagram of an H-type branch structure according to some embodiments of the present disclosure is shown;

[0013] Figure 4 A schematic diagram of another H-type branch structure according to some embodiments of the present disclosure is shown;

[0014] Figure 5 An equivalent circuit schematic of another H-type branch structure according to some embodiments of the present disclosure is shown;

[0015] Figure 6 A schematic diagram of a simulation of the input port return loss of a directional coupler according to some embodiments of the present disclosure is shown;

[0016] Figure 7 A schematic diagram of simulation curves showing the output port insertion loss and coupling degree of a directional coupler according to some embodiments of the present disclosure is shown.

[0017] Figure 8 A schematic diagram of simulation curves showing the isolation degree of the isolation port of a directional coupler according to some embodiments of the present disclosure is shown;

[0018] Figure 9 A schematic diagram of the phase relationship between the output port and the coupling port of a directional coupler according to some embodiments of the present disclosure is shown.

[0019] Figure 10 A simplified block diagram of an electronic device suitable for implementing exemplary embodiments of the present disclosure is shown. Detailed Implementation

[0020] The principles of this disclosure will now be described with reference to some embodiments. It should be understood that these embodiments are described for illustrative purposes only and to assist those skilled in the art in understanding and implementing this disclosure, and do not impose any limitation on the scope of this disclosure. The disclosure described herein may be implemented in ways other than those described below.

[0021] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0022] References to "an embodiment," "embodiment," "exemplary embodiment," etc., in this disclosure indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment needs to include specific features, structures, or characteristics. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an exemplary embodiment, whether explicitly described or not, those skilled in the art will recognize that such a feature, structure, or characteristic affects its connection to other embodiments.

[0023] It should be understood that while the terms “first” and “second”, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of the exemplary embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term “and / or” as used herein includes any and all combinations of one or more of the listed terms.

[0024] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. The singular forms “a,” “an,” and “the” used herein also include the plural forms unless the context clearly indicates otherwise. The terms “a group of elements” or “a collection of elements” as used herein are intended to include one or more elements. It should also be understood that the terms “comprising,” “including,” “having,” “possessing,” “including,” and / or “comprising,” when used herein, specify the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0025] As used in this disclosure, the term "circuit" may refer to one or more of the following:

[0026] (a) Implemented only in hardware circuitry (e.g., implemented only in analog and / or digital circuitry)

[0027] (b) A combination of hardware circuitry and software, such as (if applicable):

[0028] (i) a combination of analog and / or digital hardware circuitry with software / firmware; and

[0029] (ii) Any part of a hardware processor (including a digital signal processor), software, and memory that work together to enable a device such as a mobile phone or server to perform various functions, and

[0030] (c) Hardware circuitry and / or processors, such as microprocessors or a portion thereof, which require software (e.g., firmware) to operate, but may be absent when the software is not required to operate.

[0031] The definition of "circuit" applies to all uses of the term in this disclosure, including in any claim. As another example, as used in this disclosure, the term "circuit" also includes implementations of hardware circuitry or a processor (or processors) or a portion thereof and its accompanying software and / or firmware. The term "circuit" also includes, for example, a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing network device, if applicable to a particular claim element.

[0032] Currently, methods to improve the size of directional couplers typically involve microstrip line equivalence and bending. For example, related schemes use fan-shaped stubs and bent transmission lines to perform π-type circuit equivalence on microstrip lines to reduce the size of directional couplers. Alternatively, traditional straight stub transmission lines can be improved by designing double branches on one side of the transmission line to perform T-type circuit equivalence, thereby shortening the transmission line length.

[0033] Research has found that existing miniaturization technologies, whether using microstrip line π-type circuit equivalents or T-type circuit equivalents, are only implemented on one side of the transmission line of the directional coupler, resulting in limited miniaturization.

[0034] To address the aforementioned issues, the design concept of this technical solution is as follows: simultaneously design branch line structures on both sides of the transmission line of the branch-line directional coupler. The branch line structures on both sides provide more wiring space for the transmission line, thereby loading a larger inductive and capacitive component, further shortening the transmission line length. While achieving a greater degree of miniaturization, the operating bandwidth of the coupler can also be guaranteed by tuning the inductive and capacitive components.

[0035] This technical solution provides a directional coupler. Figure 1 A schematic diagram of the structure of a directional coupler in which exemplary embodiments of the present disclosure may be implemented is shown. Figure 2 A schematic diagram of the transmission line structure of a directional coupler according to some embodiments of the present disclosure is shown. Figure 1 and Figure 2As shown, the directional coupler in this technical solution includes a dielectric substrate and a transmission line structure disposed on the surface of the dielectric substrate. The dielectric substrate may include, for example, a microwave printed circuit board or a PCB board. Those skilled in the art can design the thickness of the dielectric substrate, the number of layers, the dielectric material, etc., according to actual needs.

[0036] The transmission line structure includes: input port Port1, through port Port2, coupling port Port3, and isolation port Port4; input port Port1 is used to input electromagnetic wave signals, through port Port2 is used to output through electromagnetic wave signals, and coupling port Port3 outputs coupled electromagnetic wave signals.

[0037] It should be noted that the port configuration described here is not intended to limit this disclosure, and those skilled in the art can design the function of each port according to actual usage. The transmission line structure also includes transmission lines disposed between the four ports, namely, a first channel transmission line T1, a second channel transmission line T2, a first branch transmission line T3, and a second branch transmission line T4; wherein:

[0038] A first transmission line T1 is formed between the input port Port1 and the through port Port2;

[0039] The second transmission line T2 is formed between the coupling port Port3 and the isolation port Port4;

[0040] The first branch transmission line T3 is formed between the input port Port1 and the isolation port Port4;

[0041] The second branch transmission line T4 is formed between the through port Port2 and the coupling port Port3.

[0042] The four transmission lines in this embodiment can be microstrip lines, striplines, coaxial lines, etc. At least one of the first channel transmission line T1, the second channel transmission line T2, the first branch transmission line T3, and the second branch transmission line T4 has a branch structure extending to both sides along the surface of the dielectric substrate.

[0043] It should be noted that, in Figure 2 The illustrated embodiment demonstrates that the branch structure is set on each of the four transmission lines of the directional coupler. In practical applications, the setting position of the branch structure can be flexibly selected according to the requirements.

[0044] In this embodiment, the branch structure is connected across both sides of the transmission line, which can simultaneously achieve the T-type equivalent circuit effect on both sides of the transmission line to increase the inductive and capacitive components of the transmission line structure. This reduces the width and length of the transmission line structure, thereby enabling the miniaturization of the directional coupler to a greater extent.

[0045] As mentioned above, the transmission line structure in this embodiment includes four transmission lines. In some scenarios, the first channel transmission line and the second channel transmission line have symmetrical line structures, as do the first branch transmission line and the second branch transmission line. In this case, if the first channel transmission line / second channel transmission line has a branch structure, the corresponding second channel transmission line / first channel transmission line should also have a branch structure; similarly, if the first branch transmission line / second branch transmission line has a branch structure, the corresponding second branch transmission line / first branch transmission line should also have a branch structure.

[0046] In some embodiments, the first channel transmission line T1 includes a first strip portion T11 and a first branch portion (T12, T13 and T14), the first branch portion having the branch structure extending from the center of the first strip portion to both sides; and the second channel transmission line T2 includes a second strip portion T21 and a second branch portion (T22, T23 and T24), the second branch portion having the branch structure extending from the center of the second strip portion to both sides.

[0047] At this point, the line structures of the first channel T1 and the second channel T2 are symmetrical. It is understood that in other application scenarios, the first channel transmission line T1 may include the first strip portion and the first branch portion, while the second channel transmission line T2 may not include the second branch portion; or the first channel transmission line T1 may not include the first branch portion, while the second channel transmission line T2 may include the second strip portion and the second branch portion.

[0048] In other embodiments, the first branch transmission line T3 includes a third strip portion T31 and a third branch portion (T32, T33 and T34), the third branch portion having the branch structure extending from the center of the third strip portion to both sides; and the second branch transmission line T4 includes a fourth strip portion T41 and a fourth branch portion (T42, T43 and T44), the fourth branch portion having the branch structure extending from the center of the fourth strip portion to both sides.

[0049] At this point, the line structures of the first branch transmission line T3 and the second branch transmission line T4 are symmetrical. It is understood that in other application scenarios, the first branch transmission line T3 may include the third strip portion and the third branch portion, while the second branch transmission line T4 may not include the fourth branch portion; or the first branch transmission line T3 may not include the third branch portion, while the second branch transmission line T4 may include the fourth strip portion and the fourth branch portion.

[0050] Furthermore, it should be noted that the branch structures of the four transmission lines mentioned above can be the same or different. When they are the same, their dimensions and shapes are exactly the same; when they are different, their dimensions and / or shapes are not the same. For example, the branch structures of the first branch and the second branch can be... Figure 3 The diagram shows an H-type branch structure, while the branch structures of the third and fourth branches can be... Figure 4 The H-type branch structure shown.

[0051] In practical applications, the operating bandwidth of the directional coupler can be guaranteed by adjusting the size and / or shape of the branch structure and tuning the loaded inductive and capacitive components.

[0052] In some embodiments, the branch structure includes an outer portion, an inner portion, and a connecting arm;

[0053] The outer portion is located outside the transmission line where the branch structure is located;

[0054] The internal portion is located inside the transmission line where the branch structure is located;

[0055] The connecting arm extends to both sides of the transmission line where the branch structure is located to connect the outer portion and the inner portion.

[0056] The outer portion is symmetrical about the connecting arm, and the inner portion is symmetrical about the connecting arm, so as to facilitate the tuning of the equivalent inductive and capacitive components of the branch structure.

[0057] refer to Figure 2 The portions of T12 in the first branch, T22 in the second branch, T32 in the third branch, and T42 in the fourth branch are all outer portions of the branch structure. The portions of T14 in the first branch, T24 in the second branch, T34 in the third branch, and T44 in the fourth branch are all connecting arms of the branch structure. The portions of T13 in the first branch, T23 in the second branch, T33 in the third branch, and T43 in the fourth branch are all inner portions of the branch structure.

[0058] It should be understood that the four transmission lines in this embodiment constitute a transmission line loop. The outside of the transmission line refers to the outside of the closed structure formed by the first channel transmission line T1, the second channel transmission line T2, the first branch transmission line T3, and the second branch transmission line T4, while the inside of the transmission line refers to the inside of the closed structure.

[0059] In some embodiments, the outer portion extends along the length of the transmission line where the branch structure is located in order to minimize the width of the outer portion coupler;

[0060] The inner portion includes a first portion and a second portion connected to the first portion. The first portion extends along the length of the transmission line where the branch structure is located, and the second portion protrudes from the first portion in a direction away from the transmission line where the branch structure is located, so as to maximize the use of the internal space of the closed structure.

[0061] refer to Figure 3 and Figure 4 The dashed boxes in the diagram represent the first inner portion (short dashed box) and the second inner portion (dotted dashed box). In this embodiment, the first portion can be elongated; the second portion gradually tapers away from the transmission line containing the branch structure. Optionally, the second portion is... Figure 3 The triangle shown or Figure 4 The figure shows an arc shape. In some embodiments, the spacing between the outer portion and the transmission line where the branch structure is located is the minimum line spacing allowed by the dielectric substrate processing technology, and the spacing between the first portion of the inner portion and the transmission line where the branch structure is located is the minimum line spacing, so as to reduce the overall size of the coupler.

[0062] In practical applications, those skilled in the art can refer to relevant technical solutions to realize the electrical connection between the branch structure and the transmission line. For example, when the transmission line is a microstrip line, those skilled in the art can etch branch structures on both sides of the center position of the first channel transmission line and the center position of the second channel transmission line, respectively. By simultaneously performing T-shaped circuit equivalents on both sides of the microstrip line through the branch structure, the distance between the first channel transmission line and the second channel transmission line is shortened to within a quarter wavelength. The distance between the outer part of the branch structure of the first channel transmission line and the first strip portion should be as small as possible, and the distance between the outer part of the branch structure of the second channel transmission line and the second strip portion should be as small as possible to reduce the width occupied by the coupler. The distance in this embodiment is related to the minimum line spacing that can be processed on the dielectric substrate. Therefore, the preset line spacing can be designed according to the minimum line spacing that can be processed on the microwave printed circuit board.

[0063] Similarly, branch structures are etched outwards from the center of the first branch transmission line and the center of the second branch transmission line, respectively. These branch structures simultaneously create a T-shaped circuit equivalent on both sides of the microstrip line, reducing the distance between the first and second branch transmission lines to less than a quarter wavelength. Specifically, the distance between the outer portion of the branch structure of the first branch transmission line and the third stripe is minimized, and the distance between the outer portion of the branch structure of the second branch transmission line and the fourth stripe is minimized to reduce the overall size of the coupler.

[0064] In this embodiment, the equivalent circuit of the branch structure includes an inner equivalent capacitor C2 and an inner equivalent inductance L2, an outer equivalent capacitor C3 and an outer equivalent inductance L3, and a connecting arm equivalent capacitor C1 and a connecting arm equivalent inductance L1. The connection method of the above equivalent capacitors and equivalent inductors can be referred to... Figure 5 This embodiment improves upon the traditional straight stub transmission line by introducing an H-type branch structure. By utilizing the tunable inductive and capacitive components equivalent to the H-type branch structure, the miniaturization of the directional coupler is achieved while maintaining the operating bandwidth.

[0065] In some embodiments, all four transmission lines of the transmission line structure include the branch structure, namely:

[0066] The first channel transmission line T1 includes a first strip portion and a first branch portion, the first branch portion having the branch structure, the branch structure extending from the center of the first strip portion to both sides;

[0067] The second channel transmission line T2 includes a second strip portion and a second branch portion, the second branch portion having the branch structure, the branch structure extending from the center of the second strip portion to both sides;

[0068] The first branch transmission line T3 includes a third strip portion and a third branch portion, wherein the third branch portion has the branch structure, and the branch structure extends from the center of the third strip portion to both sides;

[0069] The second branch transmission line T4 includes a fourth strip portion and a fourth branch portion, wherein the fourth branch portion has the branch structure, and the branch structure extends from the center of the fourth strip portion to both sides.

[0070] In some possible implementations of this embodiment, the branch structures of the first branch, the second branch, the third branch, and the fourth branch are spaced apart from each other.

[0071] by Figure 2 As shown in the example, the outer parts of the four branch structures do not contact each other, and the inner parts are separated by slits, so that the inner parts have the largest possible area, increasing the capacitive component of the parallel plate capacitor formed by the inner parts and the base plate, thereby reducing the width and / or length of the microstrip line.

[0072] In other possible implementations of this embodiment, such as Figure 2 The transmission line structure shown has the same shape for each of the first branch, the second branch, the third branch, and the fourth branch.

[0073] In other possible implementations, the shape of the branch structure of at least one of the first branch, the second branch, the third branch, and the fourth branch differs from the shape of the branch structures of the remaining branches. For example, the first branch and the second branch may have branch structures of the same shape (e.g., ...). Figure 3 The branch structure shown), while the third and fourth branches have the same shape of branch structure (e.g., the branch structure shown). Figure 4 (The branching structure shown). Alternatively, the four branches have branching structures with different shapes.

[0074] Figure 6 A schematic diagram of simulated return loss curves at the input port of a branched linear directional coupler according to some embodiments of the present disclosure is shown. Figure 7 A schematic diagram of simulation curves showing the output port insertion loss and coupling port coupling of a branched linear directional coupler according to some embodiments of the present disclosure is shown. Figure 8 A schematic diagram of simulation curves showing the isolation degree of the isolation port of a branched linear directional coupler according to some embodiments of the present disclosure is shown. Figure 9 A schematic diagram of the phase relationship between the output port and the coupling port of a branched linear directional coupler according to some embodiments of the present disclosure is shown.

[0075] refer to Figures 6 to 9 As can be seen, the Ka-band branched linear directional coupler of this embodiment operates with a bandwidth of 15.82 GHz to 22.21 GHz, with a relative bandwidth of 33.6%. Within this operating bandwidth range, the amplitude imbalance between the through port and the coupled port is less than 1.5 dB, the phase imbalance is less than 5.5 degrees, and the isolation is better than 11.25 dB. While overcoming the drawback of prior art requiring a large PCB area, it also possesses superior characteristics, making it highly suitable for application in terminal equipment of communication systems.

[0076] Now for reference Figure 10 This disclosure provides an electronic device 1000. The electronic device 1000 includes a directional coupler 1100. The structure and design principle of the directional coupler 1100 are described in the previous related embodiments and will not be repeated here.

[0077] The electronic device in this embodiment includes, for example, a satellite phased array antenna terminal, and the directional coupler 1100 can be applied to the phased array antenna module of the satellite phased array antenna terminal.

[0078] Furthermore, although the operations are described in a specific order, this should not be construed as requiring that these operations be performed in the specific order or sequence shown, or that all of the operations shown be performed to obtain the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the foregoing discussion, these details should not be construed as limiting the scope of this disclosure, but rather as descriptions of features specific to particular embodiments. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0079] Although this disclosure has been described in language specific to structural features and / or methodological behavior, it should be understood that this disclosure as defined in the appended claims is not necessarily limited to the specific features or behaviors described above. Rather, the specific features and actions described above are disclosed as exemplary forms for implementing the claims.

[0080] It should be fully understood that the use of personally identifiable information should comply with privacy policies and practices generally considered to meet or exceed industry or governmental requirements for protecting user privacy. In particular, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to the user.

Claims

1. A directional coupler, comprising: Dielectric substrate; as well as A transmission line structure is disposed on the surface of the dielectric substrate, the transmission line structure comprising: Input port; Straight-through port; Isolated ports; Coupled port; A first transmission line is formed between the input port and the through port; A second transmission line is formed between the isolation port and the coupling port; A first branch transmission line is formed between the input port and the isolation port; and A second branch transmission line is formed between the through port and the coupling port; At least one of the first channel transmission line, the second channel transmission line, the first branch transmission line, and the second branch transmission line has a branch structure extending to both sides along the surface of the dielectric substrate.

2. The directional coupler according to claim 1, wherein, The first channel transmission line includes a first strip portion and a first branch portion, the first branch portion having the branch structure extending from the center of the first strip portion to both sides; and / or The second channel transmission line includes a second strip portion and a second branch portion, the second branch portion having the branch structure extending from the center of the second strip portion to both sides.

3. The directional coupler according to claim 1, wherein, The first branch transmission line includes a third strip portion and a third branch portion, the third branch portion having the branch structure extending from the center of the third strip portion to both sides; and / or The second branch transmission line includes a fourth strip portion and a fourth branch portion, wherein the fourth branch portion has the branch structure, which extends from the center of the fourth strip portion to both sides.

4. The directional coupler according to any one of claims 1 to 3, wherein, The branch structure includes: The outer portion is located outside the transmission line where the branch structure is located; The inner portion is located inside the transmission line where the branch structure is located; and A connecting arm extends to both sides of the transmission line where the branch structure is located to connect the outer portion and the inner portion.

5. The directional coupler according to claim 4, wherein, The outer portion is symmetrical with respect to the connecting arm, and the inner portion is symmetrical with respect to the connecting arm.

6. The directional coupler according to claim 4, wherein, The outer portion extends along the length of the transmission line where the branch structure is located, and the inner portion includes a first portion and a second portion connected to the first portion. The first portion extends along the length of the transmission line where the branch structure is located, and the second portion protrudes from the first portion in a direction away from the transmission line where the branch structure is located.

7. The directional coupler according to claim 6, wherein, The distance between the outer portion and the transmission line where the branch structure is located is the minimum line spacing allowed by the dielectric substrate processing technology, and the distance between the first portion of the inner portion and the transmission line where the branch structure is located is the minimum line spacing.

8. The directional coupler according to claim 6, wherein, The second portion of the inner part gradually tapers along the transmission line away from the branch structure.

9. The directional coupler according to any one of claims 1 to 3, wherein, The first channel transmission line includes a first strip portion and a first branch portion, the first branch portion having the branch structure, the branch structure extending from the center of the first strip portion to both sides; The second channel transmission line includes a second strip portion and a second branch portion, the second branch portion having the branch structure extending from the center of the second strip portion to both sides; The first branch transmission line includes a third strip portion and a third branch portion, wherein the third branch portion has the branch structure, and the branch structure extends from the center of the third strip portion to both sides; The second branch transmission line includes a fourth strip portion and a fourth branch portion, wherein the fourth branch portion has the branch structure, which extends from the center of the fourth strip portion to both sides.

10. The directional coupler according to claim 9, wherein, The branch structures of the first branch, the second branch, the third branch, and the fourth branch are spaced apart from each other.

11. The directional coupler according to claim 9, wherein, The branch structures of the first branch, the second branch, the third branch, and the fourth branch each have the same shape; or The shape of the branch structure of at least one of the first branch, the second branch, the third branch, and the fourth branch is different from the shape of the branch structure of the remaining branches of the first branch, the second branch, the third branch, and the fourth branch.

12. An electronic device comprising a directional coupler as claimed in any one of claims 1 to 11.

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