Antenna structure and electronic device

Abstract

The present disclosure relates to an antenna structure and an electronic device. The antenna structure comprises: a first radiation branch comprising a first upper frame point; a second radiation branch spaced apart from a metal ground plate, the first radiation branch and the second radiation branch cooperating to form a gap, the second radiation branch comprising a second upper frame point and a third upper frame point, the second upper frame point being located between the third upper frame point and the gap; a first feed electrically connected to the first upper frame point, the first feed exciting a branch between the first upper frame point and an end of the gap to cover a target frequency band; a first tuning circuit having one end grounded and the other end electrically connected to the second upper frame point; and a second tuning circuit having one end grounded and the other end electrically connected to the third upper frame point. The first tuning circuit is equivalent to a short circuit for high channel signals in the target frequency band and is equivalent to an open circuit for low channel signals in the target frequency band, and the second tuning circuit is equivalent to a short circuit for the low channel signals in the target frequency band.

Description

Technical Field

[0001] This disclosure relates to the field of terminal technology, and in particular to an antenna structure and electronic device. Background Technology

[0002] As the mainstream WLAN technology, WiFi's application scenarios are constantly expanding, and its performance requirements are becoming increasingly demanding. Existing WiFi 5G antennas use a suspended stub grounding method as a parasitic stub in order to improve the radiation performance of the WiFi 5G band.

[0003] However, due to the wide frequency band of WiFi 5G, it can excite the 1 / 4 mode of parasitic branches in the low channel signal range, but it excites the loop mode in the high channel range, resulting in poor radiation performance and low efficiency of WiFi 5G frequency band in the high channel range. Utility Model Content

[0004] This disclosure provides an antenna structure and electronic device to address the shortcomings of related technologies.

[0005] According to a first aspect of the present disclosure, an antenna structure is provided, comprising:

[0006] The first radial branch includes the first upper frame point;

[0007] The second radiating branch is spaced apart from the metal floor. The first radiating branch and the second radiating branch cooperate to form a gap. The second radiating branch includes a second upper frame point and a third upper frame point. The second upper frame point is located between the third upper frame point and the gap.

[0008] A first power supply, electrically connected to the first upper frame point, excites the stubs between the first upper frame point and the end forming the gap to cover the target frequency band;

[0009] The first tuning circuit has one end grounded and the other end electrically connected to the second upper frame point;

[0010] The second tuning circuit has one end grounded and the other end electrically connected to the third upper frame point;

[0011] The first tuning circuit is equivalent to a short circuit for high-channel signals in the target frequency band and equivalent to an open circuit for low-channel signals in the target frequency band, while the second tuning circuit is equivalent to a short circuit for low-channel signals in the target frequency band.

[0012] Optionally, the first tuning circuit includes a first capacitor, one end of which is grounded and the other end is electrically connected to the second upper frame point. The first capacitor is equivalent to a short circuit for high-channel signals in the target frequency band.

[0013] Optionally, the second tuning circuit includes a zero-ohm resistor, one end of which is grounded and the other end is electrically connected to the third upper frame point. The zero-ohm resistor is equivalent to a short circuit for signals within the target frequency band.

[0014] Optionally, it also includes a second feed, wherein the first radiating branch includes a fourth upper frame point connected to the second feed, and the first upper frame point is located between the fourth upper frame point and the fracture.

[0015] The branch between the fourth upper frame point and the end forming the fracture forms a higher-order mode, and the resonant frequency of the higher-order mode is outside the target frequency band.

[0016] Optionally, the distance between the first upper frame point and the fourth upper frame point is L1, and the distance between the first upper frame point and the end of the first radial branch is L2, where L1≈2×L2.

[0017] Optionally, L1 = 2 mm.

[0018] Optionally, the distance between the first upper frame point and the end of the first radial branch is L2, and the distance between the second upper frame point and the end of the second radial branch is L3, where L2≈L3.

[0019] Optionally, the distance between the second upper frame point and the third upper frame point is L4, where L4 = 2 × L3.

[0020] Optionally, the target frequency band is the 5G Wi-Fi band.

[0021] According to a second aspect of the present disclosure, an electronic device is provided, including an antenna structure as described in any of the foregoing embodiments.

[0022] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0023] As can be seen from the above embodiments, this disclosure adjusts the length of the parasitic stub for low-channel and high-channel signals through the first and second tuning circuits to better match the frequency and wavelength of the coupling current of the high-channel signal. This is beneficial for constructing the 1 / 4 resonant mode of the parasitic stub in the high-channel signal and exciting the intrinsic mode under the high-channel signal, thereby improving the radiation performance and efficiency of the high-channel signal.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0026] Figure 1 This is a schematic diagram illustrating an antenna structure according to an exemplary embodiment.

[0027] Figure 2 This is a comparison diagram of the radiation curve of the antenna structure of this application and the radiation efficiency curve of the prior art, according to an exemplary embodiment.

[0028] Figure 3 This is a schematic diagram illustrating another antenna structure according to an exemplary embodiment. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0030] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0032] Figure 1 This is a schematic diagram illustrating an antenna structure according to an exemplary embodiment. For example... Figure 1As shown, the antenna structure includes a first radiating stub 1, a second radiating stub 2, and a first feed 3. The first radiating stub 1 and the second radiating stub 2 cooperate to form a gap, and a clearance is formed between the metal ground plane and the first radiating stub 1 and the second radiating stub 2 respectively. The clearance and the gap are connected, and the second radiating stub 2 is spaced apart from the metal ground plane; that is, the second radiating stub 2 and the metal ground plane are not electrically connected through metal ribs, and the second radiating stub 2 is a suspended stub.

[0033] The first radiating stub 1 includes a first upper frame point 11, and the second radiating stub 2 includes a second upper frame point 21 and a third upper frame point 22. The second upper frame point 21 is located between the third upper frame point 22 and the fracture, meaning that the second upper frame point 21 is closer to the end of the second radiating stub 2 used to form the fracture than the third upper frame point 22. The first feed 3 is electrically connected to the first upper frame point 11 and excites the stubs between the first upper frame point 11 and the end of the first radiating stub 1 where the fracture is formed to cover the target frequency band, such as... Figure 1 As shown, the target frequency band can be covered by the 1 / 4 resonant mode of the spur between the first upper frame point 11 and the end.

[0034] The antenna structure also includes a first tuning circuit 4 and a second tuning circuit 5. One end of the first tuning circuit 4 is grounded and the other end is electrically connected to the second upper frame point 21. One end of the second tuning circuit 5 is grounded and the other end is electrically connected to the third upper frame point 31. The first tuning circuit 4 is equivalent to a short circuit for high-channel signals in the target frequency band and equivalent to an open circuit for low-channel signals in the target frequency band. The second tuning circuit 5 is equivalent to a short circuit for low-channel signals in the target frequency band.

[0035] Thus, when the first radiating stub 1 operates at a high channel signal within the target frequency band, the electrical signal coupled to the second radiating stub 2 can be grounded through the first tuning circuit 4, such as... Figure 1 As indicated by the thin arrow, a 1 / 4 resonant mode is constructed from the second upper frame point 21 to the end stub on the second radiating stub 2 to improve the radiation efficiency of high-channel signals within the target frequency band. When the first radiating stub 1 operates with low-channel signals within the target frequency band, the electrical signal coupled to the second radiating stub 2 can be grounded through the second tuning circuit 5, adjusting the length of the parasitic resonance, thereby achieving... Figure 1 As shown by the thick arrow, a 1 / 4 resonant mode from the third upper frame point 22 to the end branch on the second radiating branch 2 can be constructed to improve the radiation efficiency of low-channel signals in the target frequency band.

[0036] Taking the target frequency band as the WiFi 5G band, signals within the 5.1GHz-5.5GHz range are considered low-channel signals, while signals within the 5.5GHz-5.8GHz range are considered high-channel signals. When the first radiating stub 1 operates in the low-channel signal range, the coupling current is grounded through the third upper frame point 22 of the second radiating stub 2. However, when the first radiating stub 1 operates in the high-channel signal range, the length of the parasitic stub is adjusted by the first tuning circuit 4, and the coupling current is grounded through the second upper frame point 21 of the second radiating stub 2. The shorter parasitic stub length better matches the frequency and wavelength of the coupling current, which is beneficial for constructing the eigenmode of the 1 / 4 resonant mode in the corresponding frequency band, thereby improving the radiation efficiency in the high-channel signal range.

[0037] For example, such as Figure 2 As shown, the dashed line represents the radiation efficiency curve of the WiFi 5G band in the prior art, while the solid line represents the radiation efficiency curve of the WiFi 5G band in the present application's technical solution. Comparing the first and third marker points, it can be seen that the radiation efficiency of the present application's technical solution is improved by approximately 3.1 dB around 5.7 GHz.

[0038] In some embodiments, such as Figure 3 As shown, the first tuning circuit 4 includes a first capacitor, one end of which is grounded and the other end is electrically connected to the second upper frame point 21. The first capacitor is equivalent to a short circuit for high-channel signals in the target frequency band. For example, the first capacitor can be a small capacitor, which generates a small capacitive reactance for high-channel signals, thus being equivalent to a short circuit.

[0039] In some embodiments, the second tuning circuit 5 includes a zero-ohm resistor, one end of which is grounded and the other end is electrically connected to the third upper frame point 22. This zero-ohm resistor is equivalent to a short circuit for signals within the target frequency band. Thus, on the one hand, a quarter-resonance mode can be constructed between the third upper frame point 22 and the end point in the low-channel signal range; on the other hand, when the high-channel signal portion is not grounded through the first tuning circuit 4, it can be grounded through this zero-ohm resistor, reducing crosstalk to the radiated current of the second radiating branch 2 itself.

[0040] In the above embodiments, it is still based on Figure 2As shown, the first radiating stub 1 also includes a second feed 6. The first radiating stub 1 includes a fourth upper frame point 12 electrically connected to the second feed 6, and the first upper frame point 11 is located between the fourth upper frame point 12 and the fracture. When the first feed 3 excites current on the first radiating stub 1, part of the current will move towards the fourth upper frame point 12, thereby forming a higher-order mode, such as a 3 / 4 resonant mode or a 5 / 4 resonant mode, in the stub between the fourth upper frame point and the end of the fracture in the first radiating stub 1. The resonant frequency of this higher-order mode is located outside the target frequency band to avoid the higher-order mode being located within the target frequency band and affecting the radiation efficiency of the target frequency band.

[0041] In some embodiments, the position of the resonant frequency of the higher-order mode can be adjusted by constructing the dimensional relationship between the first upper frame point 11, the fourth upper frame point 12, and the end of the first radiating branch 1. For example, the distance between the first upper frame point 11 and the fourth upper frame point 12 is L1, and the distance between the first upper frame point 11 and the end of the first radiating branch 1 forming the slit is L2. L1 = 2 × L2, that is, the length of L1 + L2 is approximately three times L1. For example, L1 can be approximately 2 mm.

[0042] In some embodiments, the distance between the first upper frame point 11 and the end of the first radiating branch 1 is L2, and the distance between the second upper frame point and the end of the second radiating branch 2 is L3. L2 can be approximately equal to L3, so that a quarter wavelength resonant mode of the high channel signal can be constructed from the first upper frame point 11 to the end and from the second upper frame point 21 to the end, respectively, thereby improving the radiation efficiency of the high channel signal.

[0043] Based on the technical solution of this application, an electronic device is also provided, which includes the antenna structure described in any of the foregoing embodiments. Both the first radiating stub 1 and the second radiating stub 2 can be portions of the side frame of the electronic device.

[0044] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0045] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An antenna structure, characterized in that, include: The first radial branch includes the first upper frame point; The second radiating branch is spaced apart from the metal floor. The first radiating branch and the second radiating branch cooperate to form a gap. The second radiating branch includes a second upper frame point and a third upper frame point. The second upper frame point is located between the third upper frame point and the gap. A first power supply, electrically connected to the first upper frame point, excites the stubs between the first upper frame point and the end forming the gap to cover the target frequency band; The first tuning circuit has one end grounded and the other end electrically connected to the second upper frame point; The second tuning circuit has one end grounded and the other end electrically connected to the third upper frame point; The first tuning circuit is equivalent to a short circuit for high-channel signals in the target frequency band and equivalent to an open circuit for low-channel signals in the target frequency band, while the second tuning circuit is equivalent to a short circuit for low-channel signals in the target frequency band.

2. The antenna structure according to claim 1, characterized in that, The first tuning circuit includes a first capacitor, one end of which is grounded and the other end is electrically connected to the second upper frame point. The first capacitor is equivalent to a short circuit for high-channel signals in the target frequency band.

3. The antenna structure according to claim 1, characterized in that, The second tuning circuit includes a zero-ohm resistor, one end of which is grounded and the other end is electrically connected to the third upper frame point. The zero-ohm resistor is equivalent to a short circuit for signals within the target frequency band.

4. The antenna structure according to claim 1, characterized in that, It also includes a second feed, and the first radiating branch includes a fourth upper frame point connected to the second feed, the first upper frame point being located between the fourth upper frame point and the fracture. The branch between the fourth upper frame point and the end forming the fracture forms a higher-order mode, and the resonant frequency of the higher-order mode is outside the target frequency band.

5. The antenna structure according to claim 4, characterized in that, The distance between the first upper frame point and the fourth upper frame point is L1, and the distance between the first upper frame point and the end of the first radial branch is L2, where L1≈2×L2.

6. The antenna structure according to claim 5, characterized in that, L1 = 2mm.

7. The antenna structure according to claim 1, characterized in that, The distance between the first upper frame point and the end of the first radial branch is L2, and the distance between the second upper frame point and the end of the second radial branch is L3, where L2≈L3.

8. The antenna structure according to claim 7, characterized in that, The distance between the second upper frame point and the third upper frame point is L4, where L4 = 2 × L3.

9. The antenna structure according to claim 1, characterized in that, The target frequency band is the 5G Wi-Fi band.

10. An electronic device, characterized in that, The antenna structure includes any one of claims 1-9.

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