Dual-frequency broadband antenna and mobile terminal

Abstract

The utility model discloses a double-frequency broadband antenna and a mobile terminal. The double-frequency broadband antenna comprises a first radiation unit; the second radiation unit is arranged on one side of the first radiation unit, the first radiation unit carries out direct feeding through a feeding point, and the first radiation unit carries out coupled feeding on the second radiation unit; wherein the frequency band of the first radiation unit is higher than that of the second radiation unit. According to the dual-frequency broadband antenna, the high-frequency first radiation unit is coupled with the low-frequency second radiation unit, so that the dual-frequency broadband antenna is smaller in area, smaller in required clearance area and wider in application range, and can be widely applied to mobile terminal products such as mobile phones, tablet personal computers and the like.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, and in particular to a dual-band broadband antenna and a mobile terminal. Background Technology

[0002] With the rapid development of the mobile communication industry, antennas, as a crucial component of communication systems, directly impact the quality of the entire system, thus placing higher demands on antenna radiation performance. Many smart home products, such as routers, set-top boxes, and smart door locks, require dual-band Wi-Fi antennas. However, existing dual-band Wi-Fi antennas suffer from large antenna body areas, high clearance requirements, and high costs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a dual-band broadband antenna with a smaller antenna area and a smaller required clearance area.

[0004] This utility model further proposes a mobile terminal.

[0005] A dual-band broadband antenna according to a first aspect of the present invention includes: a first radiating element; a second radiating element disposed on one side of the first radiating element, wherein the first radiating element generates direct feed through a feed point, and the first radiating element generates coupled feed to the second radiating element; wherein the frequency band of the first radiating element is higher than the frequency band of the second radiating element.

[0006] According to the embodiments of the present invention, the dual-band broadband antenna can achieve a smaller antenna area and a smaller required clearance area by coupling the first radiating element of the higher frequency band to feed the second radiating element of the lower frequency band, and can be widely used in mobile terminal products such as mobile phones, tablets, and laptops.

[0007] According to some embodiments of the present invention, the radiation direction of the first radiation unit and the radiation direction of the second radiation unit are parallel and opposite.

[0008] According to some embodiments of the present invention, the length of the first radiating element is ≤ one-quarter wavelength of the frequency band of the first radiating element.

[0009] According to some embodiments of the present invention, the first radiation unit is provided with a first radiation arm, and the second radiation unit is provided with a second radiation arm; wherein the first radiation arm and the second radiation arm are arranged in parallel and have opposite radiation directions.

[0010] According to some embodiments of the present invention, the coupling gap L formed between the first radiating arm and the second radiating arm is ≥1mm.

[0011] According to some embodiments of the present invention, the first radiating unit includes: a main radiating part, wherein the first radiating arm is located on the main radiating part; and a sub-radiating part, wherein the sub-radiating part is bent and disposed at one end of the main radiating part, and the sub-radiating part is located on the side of the main radiating part away from the second radiating arm, wherein the feed point is disposed at the end of the sub-radiating part away from the main radiating part.

[0012] According to some embodiments of the present invention, the second radiating unit includes a first radiating part, a second radiating part, and a third radiating part connected in sequence. The first radiating part and the third radiating part are bent relative to the second radiating part. The second radiating arm is located on the second radiating part. The end of the first radiating part away from the second radiating part is used for grounding. The third radiating part surrounds one end of the first radiating arm.

[0013] According to some embodiments of the present invention, the first radiating part and the third radiating part are bent in the same direction and together with the second radiating part surround the outer periphery of the first radiating unit.

[0014] According to some embodiments of the present invention, the second radiating unit is formed by the metal frame of the product; or, the second radiating unit is formed by a circuit board.

[0015] According to some embodiments of the present invention, the frequency band of the first radiating unit is 5 GHz, and the frequency band of the second radiating unit is 2.4 GHz.

[0016] The mobile terminal according to a second aspect of the present invention includes: the dual-band broadband antenna.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the structure of a dual-band wideband antenna according to an embodiment of the present invention;

[0020] Figure 2 The dual-band wideband antenna according to the embodiment of this utility model is modeled and simulated using simulation software, and the reflection coefficient varies with frequency curve;

[0021] Figure 3 This is a diagram showing the electric field distribution on the surfaces of the first and second radiating units at a frequency of 2.4 GHz according to an embodiment of the present invention.

[0022] Figure 4 This is a diagram showing the electric field distribution on the surfaces of the first and second radiating units at a frequency of 5.18 GHz according to an embodiment of the present invention.

[0023] Figure 5 This is a diagram showing the electric field distribution on the surfaces of the first and second radiating units at a frequency of 5.825 GHz according to an embodiment of the present invention.

[0024] Figure 6 This is a 3D radiation field simulation diagram of a dual-band wideband antenna at 2.4GHz according to an embodiment of the present invention;

[0025] Figure 7 This is a 3D radiation field simulation diagram of a dual-band wideband antenna at 5.18GHz according to an embodiment of the present invention;

[0026] Figure 8 This is a 3D radiation field simulation diagram of a dual-band wideband antenna at 5.825 GHz according to an embodiment of the present invention.

[0027] Figure label:

[0028] 1. First radiating unit; 11. First radiating arm; 12. Main radiating part; 13. Sub-radiating part; 2. Second radiating unit; 21. Second radiating arm; 22. First radiating part; 23. Second radiating part; 24. Third radiating part; 3. Feed point; 4. Metal substrate. Detailed Implementation

[0029] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0030] The following is for reference. Figures 1-8 This invention describes a dual-band broadband antenna according to an embodiment of the present invention.

[0031] like Figure 1 As shown, the dual-band broadband antenna includes a first radiating element 1 and a second radiating element 2. The second radiating element 2 is disposed on one side of the first radiating element 1. The first radiating element 1 is directly fed through a feed point 3, and the first radiating element 1 provides coupled feeding to the second radiating element 2. The frequency band of the first radiating element 1 is higher than that of the second radiating element 2.

[0032] Specifically, the first radiating unit 1 is connected to the feed source through the feed point 3, allowing the feed source to directly feed the first radiating unit 1 through the feed point 3. This causes a change in the electric field around the first radiating unit 1, resulting in the first radiating unit 1 radiating a wireless signal. When the first radiating unit 1 receives a wireless signal, the signal path is the opposite of the signal path during radiation. The second radiating unit 2 is not directly connected to the feed source, nor is it directly connected to the first radiating unit 1. The first radiating unit 1 and the second radiating unit 2 are positioned close to each other, within a preset distance. The electric field around the first radiating unit 1 will induce a new electric field on the second radiating unit 2, causing the second radiating unit 2 to radiate a signal. The same applies when the second radiating unit 2 receives a wireless signal. One end of the second radiating unit 2 is grounded to the metal base 4. The first radiating unit 1 is grounded through the feed source.

[0033] Furthermore, the frequency band of the first radiating element 1 is higher than that of the second radiating element 2. Based on the principle that frequency band and wavelength are inversely proportional, the wavelength of the first radiating element 1 is shorter than that of the second radiating element 2. Since the first radiating element 1 is a directly fed unit and the second radiating element 2 is a coupled fed unit, it is only necessary for the length of the first radiating element 1 to meet the wavelength requirements of its frequency band, while the length of the second radiating element 2 can be adjusted according to the actual application.

[0034] As an example, the first radiating element 1 operates at a frequency of 5 GHz, and the second radiating element 2 operates at a frequency of 2.4 GHz. Thus, this embodiment of the dual-band broadband antenna achieves a 5 GHz coupled to 2.4 GHz technical solution. Specifically, the second radiating element 2 is primarily used for 2.4 GHz frequency radiation, while simultaneously assisting the first radiating element 1 in 5 GHz frequency radiation. Conversely, the first radiating element 1 is primarily used for 5 GHz frequency radiation, while simultaneously assisting the second radiating element 2 in 2.4 GHz frequency radiation. Compared to the 2.4 GHz coupled to 5 GHz technical solution, this reduces the area required for antenna design and requires less clearance, achieving miniaturization of the dual-band broadband antenna, reducing the development difficulty of mobile terminal products, and saving costs.

[0035] Therefore, by coupling the first radiating element 1 of the higher frequency band to feed the second radiating element 2 of the lower frequency band, the design area of ​​the dual-band broadband antenna can be reduced, and the required clearance area can be reduced, thus realizing the miniaturization design of the dual-band broadband antenna. This makes the application range of the dual-band broadband antenna wider, and it can be widely used in mobile terminal products such as mobile phones, tablets, and laptops.

[0036] It should be noted that the above descriptions of higher and lower frequency bands are only used to compare the frequency bands between the first radiating unit 1 and the second radiating unit 2, and do not mean that the frequency band of the first radiating unit 1 is the high frequency band of electromagnetic waves and the frequency band of the second radiating unit 2 is the low frequency band of electromagnetic waves.

[0037] According to some embodiments of the present invention, the radiation direction of the first radiation unit 1 and the radiation direction of the second radiation unit 2 are parallel and opposite.

[0038] With this configuration, the first radiating element 1 and the second radiating element 2 radiate in opposite directions simultaneously, thereby increasing the radiating area and improving the radiation performance of both elements. Furthermore, the parallel structure of the dual-band broadband antenna design allows for increased bandwidth by extending the radiating length of the second radiating element 2.

[0039] According to some embodiments of the present invention, the length of the first radiating element 1 is ≤ one-quarter wavelength of the frequency band of the first radiating element 1.

[0040] In this embodiment, the frequency band of the first radiating element 1 is WIFI 5GHz, and the wavelength of the first radiating element 1 is about 6cm. Therefore, the total length of the first radiating element 1 is ≤15mm. The WIFI dual-band antenna formed in this way has better radiation capability.

[0041] According to some embodiments of the present invention, a first radiation unit 1 is provided with a first radiation arm 11, and a second radiation unit 2 is provided with a second radiation arm 21. The first radiation arm 11 and the second radiation arm 21 are arranged in parallel and have opposite radiation directions.

[0042] like Figure 1 As shown, the first radiating arm 11 and the second radiating arm 21 are arranged in parallel, and their radiation directions are opposite. Thus, after a coupling gap is formed between the first radiating arm 11 and the second radiating arm 21, energy can be radiated outward from the coupling gap. Simultaneously, radiation in opposite directions increases the radiation area, thereby effectively improving the radiation capability of the dual-band broadband antenna. Furthermore, the required bandwidth can be extended by increasing the radiation length of the second radiating arm 21.

[0043] According to some embodiments of this utility model, the coupling gap L formed between the first radiating arm 11 and the second radiating arm 21 is ≥1mm. Thus, by adjusting the coupling gap between the first radiating arm 11 and the second radiating arm 21, the bandwidth range of the dual-band broadband antenna can be adjusted, thereby meeting the bandwidth requirements of different high and low frequency bands corresponding to the first radiating element 1 and the second radiating element 2.

[0044] According to some embodiments of the present invention, the first radiating unit 1 includes a main radiating part 12 and a sub-radiating part 13, with a first radiating arm 11 located on the main radiating part 12. The sub-radiating part 13 is bent and disposed at one end of the main radiating part 12, and the sub-radiating part 13 is located on the side of the main radiating part 12 away from the second radiating arm 21. A feed point 3 is provided at the end of the sub-radiating part 13 away from the main radiating part 12.

[0045] Specifically, such as Figure 1 As shown, a sub-radiator 13 is provided at one end of the main radiator 12. The sub-radiator 13 is bent relative to the main radiator 12, so that the first radiator unit 1 is roughly L-shaped. The sub-radiator 13 is located on the side of the main radiator 12 away from the second radiator arm 21, so that the first radiator arm 11 on the main radiator 12 is close to the second radiator arm 21, thereby enabling coupling and feeding of the second radiator arm 21. The end of the sub-radiator 13 away from the main radiator 12 is connected to the feed source by setting a feed point 3.

[0046] According to some embodiments of the present invention, the second radiating unit 2 includes a first radiating part 22, a second radiating part 23 and a third radiating part 24 connected in sequence. The first radiating part 22 and the third radiating part 24 are bent relative to the second radiating part 23. The second radiating arm 21 is located on the second radiating part 23. The end of the first radiating part 22 away from the second radiating part 23 is used for grounding. The third radiating part 24 surrounds one end of the first radiating arm 11.

[0047] Specifically, such as Figure 1 As shown, the second radiating arm 21 on the second radiating part 23 is arranged parallel to the first radiating arm 11, while the first radiating part 22 and the third radiating part 24 at both ends of the second radiating part 23 are bent relative to the second radiating part 23 so that the third radiating part 24 can surround one end of the first radiating arm 11. In this way, one end of the first radiating arm 11 and the third radiating part 24 can also form a coupling gap. The gap formed by the coupling gap is equivalent to a capacitor and has a voltage difference, forming a cavity for surface radiation and improving the radiation capability.

[0048] Furthermore, the third radiating part 24 surrounds one end of the first radiating arm 11 and is positioned close to the feed point 3. With this configuration, the current is concentrated at the feed point 3, while the charge at the tip of the third radiating part 24 is focused. Energy is radiated outward from the gap formed by the coupling gap between the third radiating part 24 and one end of the first radiating arm 11, thus better enhancing the radiation capability of the dual-band broadband antenna.

[0049] According to some embodiments of the present invention, the first radiating part 22 and the third radiating part 24 are bent in the same direction and together with the second radiating part 23 surround the outer periphery of the first radiating unit 1.

[0050] Specifically, such as Figure 1As shown, the first radiating part 22 and the third radiating part 24 are bent in the same direction and together with the second radiating part 23 surround the outer periphery of the first radiating unit 1, thus forming a larger coupling area with the first radiating unit 1 and improving the radiation capability.

[0051] According to some embodiments of this utility model, the second radiating element 2 is formed from the product's metal frame; or, the second radiating element 2 is formed from a circuit board. This configuration allows the product's metal frame to be directly used as the second radiating element 2, resulting in a smaller area for the dual-band broadband antenna and a smaller required clearance area, thus making the dual-band broadband antenna more compact. Alternatively, the second radiating element 2 can also be made from a flexible circuit board, allowing for application design based on the actual product. Since the first radiating element 1 is a direct-feed unit,

[0052] According to some embodiments of this utility model, the frequency band of the first radiating unit 1 is 5GHz, and the frequency band of the second radiating unit 2 is 2.4GHz. Specifically, the WIFI frequency band of the first radiating unit 1 is 5180-5825MHz, and the WIFI frequency band of the second radiating unit 2 is 2400-2500MHz.

[0053] In this embodiment, the dual-band broadband antenna is modeled and simulated using simulation software, see [link / details]. Figure 2 The reflection coefficient versus frequency curve shown indicates that the -6dB impedance bandwidth of the antenna element covers the dual-band WiFi frequency range, meeting the dual-band operation requirements of the terminal antenna. Furthermore, combined with... Figures 3-5 It can be seen that during low-frequency operation, radiation is mainly generated by the second radiating unit 2, while during high-frequency operation, radiation is mainly generated by the first radiating unit 1. Furthermore, combined with... Figures 6-8 It can be seen that the low-frequency and high-frequency antennas in this embodiment have excellent radiation performance.

[0054] In summary Figures 2-5 The data results shown demonstrate that the dual-band broadband antenna possesses excellent impedance matching characteristics and high radiation characteristics within its operating frequency band. While achieving dual-band operation, it also ensures the miniaturization of the dual-band broadband antenna, which is beneficial for meeting the engineering requirements of dual-band broadband antenna design.

[0055] A mobile terminal according to a second aspect of the present invention includes: a dual-band broadband antenna.

[0056] Therefore, by using the dual-band broadband antenna of this embodiment in a mobile terminal, the required area and clearance of the dual-band broadband antenna can be reduced, achieving miniaturization of the dual-band broadband antenna, reducing the difficulty of product development for mobile terminals, saving costs, and expanding its application range to include mobile terminal products such as mobile phones, tablets, and laptops. Furthermore, the dual-band broadband antenna of this embodiment employs a first radiating element coupled to a second radiating element 2 that is coupled to a lower frequency element, and the first radiating element 1 and the second radiating element 2 are horizontally arranged, allowing energy to radiate outward from the coupling gap, effectively improving the antenna's radiation capability. Additionally, the metal frame structure of the mobile terminal product itself, such as a mobile phone or tablet, can be used as the second radiating element 2.

[0057] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0059] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-band broadband antenna, characterized in that, include: First radiating unit; The second radiating element is disposed on one side of the first radiating element. The first radiating element generates direct power through a feed point, and the first radiating element generates coupled power to the second radiating element. The frequency band of the first radiating element is higher than that of the second radiating element.

2. The dual-band broadband antenna according to claim 1, characterized in that, The radiation direction of the first radiation unit is parallel and opposite to that of the second radiation unit.

3. The dual-band broadband antenna according to claim 1, characterized in that, The length of the first radiating element is less than or equal to one-quarter of the wavelength of the frequency band of the first radiating element.

4. The dual-band broadband antenna according to claim 1, characterized in that, The first radiating unit is provided with a first radiating arm, and the second radiating unit is provided with a second radiating arm; The first radiating arm and the second radiating arm are arranged in parallel and have opposite radiating directions.

5. The dual-band broadband antenna according to claim 4, characterized in that, The coupling gap L formed between the first radiating arm and the second radiating arm is ≥1mm.

6. The dual-band broadband antenna according to claim 4, characterized in that, The first radiating unit includes: a main radiating part, with the first radiating arm located on the main radiating part; and a sub-radiating part, which is bent and disposed at one end of the main radiating part, and is located on the side of the main radiating part away from the second radiating arm, with the feed point disposed at the end of the sub-radiating part away from the main radiating part.

7. The dual-band broadband antenna according to claim 4, characterized in that, The second radiating unit includes a first radiating part, a second radiating part, and a third radiating part connected in sequence. The first radiating part and the third radiating part are bent relative to the second radiating part. The second radiating arm is located on the second radiating part. The end of the first radiating part away from the second radiating part is used for grounding. The third radiating part surrounds one end of the first radiating arm.

8. The dual-band broadband antenna according to claim 7, characterized in that, The first radiating part and the third radiating part are bent in the same direction and together with the second radiating part surround the outer periphery of the first radiating unit.

9. The dual-band broadband antenna according to claim 1, characterized in that, The second radiating unit is formed from the metal frame of the product; or, the second radiating unit is formed from a circuit board.

10. The dual-band broadband antenna according to claim 1, characterized in that, The first radiating element has a frequency band of 5 GHz, and the second radiating element has a frequency band of 2.4 GHz.

11. A mobile terminal, characterized in that, include: The dual-band broadband antenna according to any one of claims 1-10.

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