Antenna structure and electronic device

Abstract

The present disclosure relates to an antenna structure and an electronic device. The antenna structure comprises: a first radiator comprising a first ground end, a first end, a first upper frame point and a second upper frame point; a second radiator comprising a second ground end, a second end, a third upper frame point and a fourth upper frame point, a gap being provided between the first end and the second end; a first feed electrically connected to the first upper frame point; a second feed electrically connected to the third upper frame point; a first filter circuit having one end grounded and the other end electrically connected to the second upper frame point; a second filter circuit having one end grounded and the other end electrically connected to the fourth upper frame point; the first feed exciting a main resonance mode of a branch between the first end and the first upper frame point and a parasitic resonance mode of the second filter circuit to the second end to radiate a first frequency band signal, and the second feed exciting a main resonance mode of a branch between the second ground end and the second end and a parasitic resonance mode of the first end to the first filter circuit to radiate a second frequency band signal.

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 electronic devices become thinner, smaller, and have higher screen-to-body ratios, internal space is becoming increasingly limited, leaving less and less room for antennas. Therefore, to reduce space requirements, many existing antennas operate in a relatively simple mode, radiating only through their own resonant mode, resulting in narrow bandwidth and mediocre performance. Summary of the Invention

[0003] This disclosure provides an antenna structure and electronic device to address the shortcomings of related technologies.

[0004] According to a first aspect of the present disclosure, an antenna structure is provided, comprising:

[0005] The first radiator includes a first grounding terminal, a first end terminal, a first upper frame point, and a second upper frame point.

[0006] The second radiator includes a second grounding terminal, a second end, a third upper frame point, and a fourth upper frame point, with a gap provided between the first end and the second end.

[0007] The first power supply is electrically connected to the first upper frame point;

[0008] The second power supply is electrically connected to the third upper frame point;

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

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

[0011] The first power supply excites the main resonant mode of the branch between the first end and the first upper frame point, and the parasitic resonant mode from the second filter circuit to the second end to radiate a first frequency band signal. The second power supply excites the main resonant mode of the branch between the second ground terminal and the second end, and the parasitic resonant mode from the first end to the first filter circuit to radiate a second frequency band signal.

[0012] Optionally, the frequency of the first frequency band signal is greater than the frequency of the second frequency band signal, the fourth upper frame point is located between the third upper frame point and the second end, and the second upper frame point is located between the first grounding end and the first upper frame point.

[0013] Optionally, the main resonant mode of the spur between the first end and the first upper frame point is the intrinsic mode of the first frequency band signal, and the intrinsic mode is a 1 / 4 wavelength resonant mode.

[0014] Optionally, the stub length between the second end and the fourth top frame point is the first length, and the equivalent physical length of the second filter circuit is the second length. The sum of the first length and the second length is equal to the stub length between the first top frame point and the first end.

[0015] Optionally, the main resonant mode of the stub between the second grounding terminal and the second end is the intrinsic mode of the second frequency band signal, and the intrinsic mode is a 1 / 4 wavelength resonant mode.

[0016] Optionally, the equivalent physical length of the first filter circuit is a third length, and the length of the stub between the first end and the second upper frame point is a fourth length. The sum of the third length and the fourth length is equal to the length of the second radiator.

[0017] Optionally, the first filter circuit is a parallel LC circuit or a series LC circuit; and / or,

[0018] The second filter circuit is a parallel LC circuit or a series LC circuit.

[0019] Optionally, the second filtering circuit is equivalent to an open circuit for the second frequency band signal; and / or, the antenna structure further includes a de-isolation circuit, which is electrically connected between the first feed and the first upper frame point, and the de-isolation circuit is equivalent to an open circuit for the second frequency band signal.

[0020] Optionally, the first frequency band signal is a 5G Wi-Fi frequency band signal, and the second frequency band signal is a 2.4G Wi-Fi frequency band signal.

[0021] According to a second aspect of the present disclosure, an electronic device is provided, including an antenna connection structure as described in any of the foregoing embodiments, wherein the first radiator and the second radiator are metal frame segments of the electronic portion.

[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, by sharing a gap between the first radiator and the second radiator, this disclosure has the advantages of reducing the number of gaps in the side frames of the first radiator and the second radiator, thereby improving strength. On the other hand, the gap can be used to achieve current coupling, and a suitable parasitic resonance mode can be constructed through the first filter circuit and the second filter circuit, so that the first frequency band signal and the second frequency band signal are both covered by the main resonance mode and the parasitic resonance mode, which is beneficial to improving the bandwidth and performance of the first frequency band signal and the second frequency band 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 The diagram shows a comparison of the efficiency of the disclosed technical solution with existing solutions in radiating Wi-Fi 2.4G and Wi-Fi 5G frequency band signals.

[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 1 As shown, the antenna structure includes a first radiator 1, a second radiator 2, a first feed 3, a second feed 4, a first filter circuit 5, and a second filter circuit 6. The first radiator 1 includes a first ground terminal 11, a first end terminal 12, a first upper frame point 13, and a second upper frame point 14. The first end terminal 12 is positioned opposite to the first ground terminal 11, which can be grounded via a metal rib or a circuit. The second radiator 2 includes a second ground terminal 21, a second end terminal 22, a third upper frame point 23, and a fourth upper frame point 24. The second end terminal 22 is positioned opposite to the second ground terminal 21, which can be grounded via a metal rib or a circuit. A gap is formed between the first end terminal 12 and the second end terminal 22 to achieve signal radiation.

[0033] The first power supply 3 is electrically connected to the first upper frame point 13. One end of the second filter circuit 6 is grounded, and the other end is electrically connected to the fourth upper frame point 14. With this configuration, the signal fed into the first power supply 3 excites the first radiator 1 to generate a current. This current can be coupled to the second radiator 2 through the gap between the first end 12 and the second end 22, and then grounded through the second filter circuit 6. Therefore, as... Figure 1 The current distribution indicated by the thin arrows can excite the main resonant mode between the first end 12 and the first upper frame point 13, and the parasitic resonant mode between the second filter circuit 6 and the second end 22, through which the first frequency band signal is radiated. According to transmission line theory, the second filter circuit 6 can have a corresponding equivalent physical length, which can also be considered as a radiating branch of the parasitic resonant mode.

[0034] The second feed 4 is electrically connected to the third upper frame point 23. One end of the first filter circuit 5 is grounded, and the other end is electrically connected to the second upper frame point 14. With this configuration, the signal fed into the second feed 4 excites the second radiator 2 to generate a current. This current can be coupled to the first radiator 1 through the gap between the first end 12 and the second end 22, and then grounded through the first filter circuit 5. Therefore... Figure 1The current distribution indicated by the thick arrows can excite the main resonant mode between the second ground terminal 21 and the second end terminal 22, and the parasitic resonant mode between the first end terminal 12 and the first filter circuit 5, through which the first frequency band signal is radiated. According to transmission line theory, the first filter circuit 5 can have a corresponding equivalent physical length, which can also be considered as a radiating branch of the parasitic resonant mode.

[0035] Based on this, by sharing a joint between the first radiator 1 and the second radiator 2, on the one hand, it is beneficial to reduce the number of joints in the side frame on which the first radiator 1 and the second radiator 2 are configured, thereby improving the strength; on the other hand, current coupling can be achieved by using the joint, and a suitable parasitic resonance mode can be constructed by the first filter circuit 5 and the second filter circuit 6, so that the first frequency band signal and the second frequency band signal are both covered by the main resonance mode and the parasitic resonance mode, which is beneficial to improving the bandwidth and performance of the first frequency band signal and the second frequency band signal.

[0036] Taking a first frequency band signal as a 5G Wi-Fi signal and a second frequency band signal as a 2.4G Wi-Fi signal as an example, such as Figure 2 As shown in the figure, the blue curve represents the efficiency curve of radiating a 2.4G Wi-Fi signal using only the radiator's own resonant mode in the existing solution, while the dark green curve represents the efficiency curve of radiating a 2.4G Wi-Fi signal using both the main resonant mode and the parasitic resonant mode in the present application. The comparison shows that the radiating efficiency of the 2.4G Wi-Fi signal in the present application is improved by more than 2dB. (The last sentence appears to be incomplete and possibly refers to a different approach.) Figure 2 As shown in the figure, the brown curve represents the efficiency curve of radiating Wi-Fi 5G signals using only the radiator's own resonant mode in existing solutions, while the light green curve represents the efficiency curve of radiating Wi-Fi 5G signals using both the main resonant mode and the parasitic resonant mode in this application. The comparison shows that the bandwidth of the Wi-Fi 5G signal in this application is wider, and the average radiation efficiency is improved by approximately 2 dB. Therefore, it is evident that by rationally utilizing the parasitic resonant mode, the radiation efficiency and bandwidth can be effectively improved through the technical solution of this application.

[0037] In some embodiments, the frequency of the first frequency band signal is greater than the frequency of the second frequency band signal. Therefore, the length of the radiating stub radiating the first frequency band signal can be relatively short, while the length of the radiating stub radiating the second frequency band signal can be relatively long. Consequently, the required equivalent physical length of the parasitic resonant mode radiating the first frequency band signal is shorter, while the required equivalent physical length of the parasitic resonant mode radiating the second frequency band signal is longer. In the parasitic resonant mode, the length of the physical stub has a greater impact on the equivalent physical length in the parasitic resonant mode. Therefore, in order to better tune out the parasitic resonant modes of the first and second frequency band signals and make them match the main resonant mode as closely as possible, the fourth upper frame point 24 can be located between the third upper frame point 23 and the second end 22, making the fourth upper frame point 24 as close as possible to the second end 22. This shortens the length of the physical stub corresponding to the parasitic resonant mode radiating the first frequency band signal, which simplifies the configuration requirements of the second filter circuit 6. Similarly, the second upper frame point 14 is located between the first ground terminal 11 and the first upper frame point 13, so that the second upper frame point 14 is set as far away from the first end 12 as possible, which extends the length of the physical branch corresponding to the parasitic resonance mode radiating the second frequency band signal, and helps to simplify the configuration requirements of the second filter circuit 6.

[0038] In some embodiments, the main resonant mode of the branch between the first end 12 and the first upper frame point 13 is the eigenmode of the first frequency band signal. This eigenmode is a 1 / 4 wavelength resonant mode, thereby radiating the first frequency band signal through the eigenmode, which is beneficial to improving the radiation efficiency of the Wi-Fi 5G signal. To satisfy the requirement that the main resonant mode is a 1 / 4 wavelength resonant mode, the following must be met:

[0039] L1 = λ * 1 / 4;

[0040]

[0041] Where λ is the operating wavelength in the medium;

[0042] c is the speed of light in a vacuum;

[0043] f0 is the target frequency for the antenna to operate at;

[0044] ε r is the dielectric constant of the medium.

[0045] Furthermore, such as Figure 3As shown, the stub length between the second end 22 and the fourth upper frame point 24 is the first length L2, and the equivalent physical length of the second filter circuit 6 is the second length S1. The sum of the first length L2 and the second length S2 is equal to the stub length between the first upper frame point 13 and the first end 12, that is, L1 = L2 + S1, where L1 is the stub length between the first upper frame point 13 and the first end 12. This setting allows the stub length corresponding to the parasitic resonance mode to basically satisfy the intrinsic resonance mode of the first frequency band signal, thereby helping to improve the radiation efficiency of the first frequency band signal.

[0046] The equivalent physical length S1 of the second filter circuit 6 can be calculated based on transmission line theory. For example, taking... Figure 2 As shown, the second filter circuit 6 is an LC parallel circuit, which satisfies the following:

[0047] θ = S1 * β;

[0048]

[0049] w = 2πf0;

[0050] Where L is the inductance value of the LC parallel circuit;

[0051] C is the capacitance value of the LC parallel circuit;

[0052] Z0 is the characteristic impedance of the antenna, which is taken as 50Ω;

[0053] Z L The load impedance of the antenna is related to the antenna design and can be calculated using commercial software simulation.

[0054] Based on the above calculations, the equivalent physical length of the LC parallel circuit can be obtained. The above explanation uses an LC parallel circuit as an example. When the first filter circuit 5 and the second filter circuit 6 include an LC series circuit, the equivalent resistance of the LC series circuit is calculated as follows:

[0055]

[0056] Other calculation methods can be found in the aforementioned embodiments, and will not be described in detail here.

[0057] Similarly, the main resonant mode of the stub between the second grounding terminal 21 and the second end 22 is the eigenmode of the second frequency band signal, and this eigenmode is a 1 / 4 wavelength mode. Therefore, radiating the second frequency band signal through this eigenmode is beneficial for improving the radiation efficiency of the Wi-Fi 2.4G signal. To ensure that the main resonant mode is a 1 / 4 wavelength resonant mode, the length of the second radiator 2 must satisfy the following:

[0058] L3 = λ * 1 / 4;

[0059]

[0060] Where λ is the operating wavelength in the medium;

[0061] c is the speed of light in a vacuum;

[0062] f0 is the target frequency for the antenna to operate at;

[0063] ε r is the dielectric constant of the medium.

[0064] Furthermore, the length of the branch between the first end 12 and the second upper frame point 14 is the third length L3, and the equivalent physical length of the first filter circuit 5 is the fourth length S2. The sum of the third length L3 and the fourth length S2 is equal to the length L3 of the second radiator 2, that is, L3 = L4 + S2. The length of S2 needs to be calculated according to the specific circuit configuration of the first filter circuit 5, which can be referred to in the aforementioned embodiment. With this configuration, the 2.4G WiFi band signal can be radiated through the intrinsic mode via the parasitic resonance mode, which is beneficial to improving the radiation efficiency of the 2.4G WiFi band signal.

[0065] In the above embodiments, such as Figure 1 As shown, the first filter circuit 5 can be an LC series circuit, or as... Figure 3 As shown, the first filter circuit 5 can be an LC parallel circuit; similarly, as... Figure 1 As shown, the first filter circuit 5 can be an LC series circuit, or as... Figure 3 As shown, the first filter circuit 5 can be an LC parallel circuit.

[0066] In the above embodiments, the second filter circuit 6 needs to be equivalent to an open circuit for the second frequency band signal. This prevents current on the branches of the second radiator 2 from flowing to ground through the second filter circuit 6, thus weakening the radiation performance of the second frequency band signal. For example, taking the second frequency band signal as a Wi-Fi 2.4G frequency band signal, the second filter circuit 6 can be equivalent to a small capacitor or a large inductor, thereby effectively opening the circuit for the Wi-Fi 2.4G frequency band signal. For example, if the second filter circuit 6 is a parallel LC circuit, the equivalent inductance and equivalent capacitance are calculated as follows:

[0067] L 等效 =L / (1-w 2 LC);

[0068] C 等效 =C-1 / (w 2 L);

[0069] L is obtained by calculating in this way 等效Greater than or equal to the preset inductance value or C 等效 If the capacitance value is less than or equal to the preset value, it can be considered as an open circuit relative to the second frequency band signal.

[0070] Of course, when the second filter circuit 6 is an LC series circuit, the equivalent inductance and equivalent capacitance can be calculated in the following way:

[0071] L 等效 =L-1 / (w 2 C);

[0072] C 等效 =C / (1-w) 2 LC).

[0073] In the above embodiments, such as Figure 3 As shown, the antenna structure may further include a de-isolation circuit 7, which is electrically connected between the first feed 3 and the first upper frame point 13. This de-isolation circuit 7 can be effectively an open circuit for the second frequency band signal, thereby improving the isolation between signals. Taking a 5G Wi-Fi signal as the first frequency band and a 2.4G Wi-Fi signal as the second frequency band as an example, the de-isolation circuit 7 may include a capacitor connected in series between the first feed 3 and the first upper frame point 13. The capacitance value of the capacitor is less than or equal to a set value, such as less than or equal to 2pF. This effectively acts as an open circuit for the 2.4G Wi-Fi signal and a short circuit for the 5G Wi-Fi signal, reducing interference caused by the 2.4G Wi-Fi signal to the 5G Wi-Fi signal.

[0074] Based on the technical solution of this disclosure, an electronic device is also provided, which includes the antenna structure described in any of the foregoing embodiments. The first radiator 1 and the second radiator 2 are portions of the metal frame of the electronic device, which can be the side frame or top frame of the electronic device. This electronic device can include mobile phones, tablets, etc.

[0075] 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.

[0076] 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 radiator includes a first grounding terminal, a first end terminal, a first upper frame point, and a second upper frame point. The second radiator includes a second grounding terminal, a second end, a third upper frame point, and a fourth upper frame point, with a gap provided between the first end and the second end. The first power supply is electrically connected to the first upper frame point; The second power supply is electrically connected to the third upper frame point; The first filter circuit has one end grounded and the other end electrically connected to the second upper frame point; The second filter circuit has one end grounded and the other end electrically connected to the fourth upper frame point; The first power supply excites the main resonant mode of the branch between the first end and the first upper frame point, and the parasitic resonant mode from the second filter circuit to the second end to radiate a first frequency band signal. The second power supply excites the main resonant mode of the branch between the second ground terminal and the second end, and the parasitic resonant mode from the first end to the first filter circuit to radiate a second frequency band signal.

2. The antenna structure according to claim 1, characterized in that, The frequency of the first frequency band signal is greater than the frequency of the second frequency band signal. The fourth upper frame point is located between the third upper frame point and the second end, and the second upper frame point is located between the first grounding end and the first upper frame point.

3. The antenna structure according to claim 2, characterized in that, The main resonant mode of the branch between the first end and the first upper frame point is the intrinsic mode of the first frequency band signal, and the intrinsic mode is a 1 / 4 wavelength resonant mode.

4. The antenna structure according to claim 3, characterized in that, The length of the branch between the second end and the fourth top frame point is the first length, and the equivalent physical length of the second filter circuit is the second length. The sum of the first length and the second length is equal to the length of the branch between the first top frame point and the first end.

5. The antenna structure according to claim 1, characterized in that, The main resonant mode of the stub between the second grounding terminal and the second end is the eigenmode of the second frequency band signal, and the eigenmode is a 1 / 4 wavelength resonant mode.

6. The antenna structure according to claim 1, characterized in that, The equivalent physical length of the first filter circuit is the third length, and the length of the stub between the first end and the second upper frame point is the fourth length. The sum of the third length and the fourth length is equal to the length of the second radiator.

7. The antenna structure according to claim 1, characterized in that, The first filter circuit is a parallel LC circuit or a series LC circuit; and / or, The second filter circuit is a parallel LC circuit or a series LC circuit.

8. The antenna structure according to claim 1, characterized in that, The second filtering circuit is equivalent to an open circuit for the second frequency band signal; and / or, the antenna structure further includes a de-isolation circuit, which is electrically connected between the first feed and the first upper frame point, and the de-isolation circuit is equivalent to an open circuit for the second frequency band signal.

9. The antenna structure according to claim 1, characterized in that, The first frequency band signal is a 5G WiFi frequency band signal, and the second frequency band signal is a 2.4G WiFi frequency band signal.

10. An electronic device, characterized in that, The antenna structure includes any one of claims 1-9, wherein the first radiator and the second radiator are part of the metal frame segment of the electronic device.

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