Laminated coupled three-in-one antenna and mobile device

Abstract

The utility model provides a laminated coupled three-in-one antenna and a mobile device. The three-in-one antenna comprises a double-branch antenna and a coupled antenna which are arranged on different surfaces of a middle frame. The double-branch antenna comprises a feeding point, a common radiation section, a grounding point, a first radiation arm and a frequency multiplication radiation arm; the feeding point and the grounding point are connected through the common radiation section; one end of the first radiation arm is connected with the feeding point, and the other end extends along the direction away from the grounding point; one end of the frequency multiplication radiation arm is connected with the grounding point, and the other end extends along the direction away from the feeding point; the feeding point, the frequency doubling radiation arm and the grounding point form a third antenna loop, the frequency of the third antenna loop is integral multiples of the frequency of the second antenna loop, and the length of the frequency doubling radiation arm is 3 / 4 of the wavelength of the third antenna loop; the coupled antenna is coupled with the third antenna loop. According to the utility model, the double-branch antenna and the coupled antenna are arranged on different surfaces of the middle frame, so that the space is saved, and a three-in-one antenna structure is realized under the condition of limited antenna clearance.

Description

Technical Field

[0001] The utility model belongs to the technical field of mobile device communication, and in particular relates to a stacked coupled three-in-one antenna and a mobile device. Background Art

[0002] In smart devices, antennas directly affect communication capabilities and directly determine signal transmission and reception performance. Even the quality of antenna design determines the survival space of smart devices in the market. High-speed data transmission directly affects the user experience. How to improve antenna performance in a limited space is crucial. Currently, smart devices have higher and higher performance requirements for antennas. However, the popular full-screen design and multi-camera distribution have caused the antenna space to become smaller and smaller, the antenna design environment has become worse, and the antenna efficiency has been affected.

[0003] With the coverage of wireless networks in various occasions, users are using WiFi more and more frequently. The performance of WiFi antennas is becoming more and more important, which directly affects the user experience. Poor performance and stability of GPS antennas can be directly reflected when using map navigation. The three-in-one antenna of a smartphone is the GPS&WiFi&BT antenna. The efficiency of the three-in-one antenna directly affects the actual use effect of customers. How to improve the performance of the three-in-one antenna and achieve high efficiency has always been a hot topic of concern. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and provide a stacked coupled three-in-one antenna. The dual-branch antenna and the coupled antenna are used to be arranged on different surfaces of the middle frame, which is conducive to saving space and avoiding occupying too much space on the same surface of the middle frame, thereby realizing a three-in-one antenna structure in an environment with limited antenna clearance.

[0005] The utility model is realized by the following technical solutions:

[0006] A stacked coupled three-in-one antenna comprises a dual-branch antenna and a coupling antenna for being arranged on different surfaces of a middle frame; the dual-branch antenna comprises a feeding point, a common radiating section, a grounding point, a first radiating arm and a frequency doubling radiating arm; the feeding point and the grounding point are connected through the common radiating section; one end of the first radiating arm is connected to the feeding point, and the other end extends in a direction away from the grounding point, and the feeding point, the first radiating arm and the grounding point form a first antenna loop; one end of the frequency doubling radiating arm is connected to the grounding point, and the other end extends in a direction away from the feeding point, and the feeding point, the frequency doubling radiating arm and the second grounding point form a second antenna loop; the feeding point, the frequency doubling radiating arm and the grounding point form a third antenna loop, the frequency of the third antenna loop is an integer multiple of the frequency of the second antenna loop, and the length of the frequency doubling radiating arm is 3 / 4 of the wavelength of the third antenna loop; the coupling antenna is coupled to the third antenna loop.

[0007] The utility model provides a laminated coupled three-in-one antenna, which excites two resonances through a double-branch antenna to form a first antenna loop and a second antenna loop, and simultaneously excites a third resonance by using a frequency-doubling radiation arm, and couples a coupled antenna with the third resonance to improve the antenna efficiency of the third antenna loop; the double-branch antenna and the coupled antenna are used to be arranged on different surfaces of a middle frame, which is beneficial to saving space, avoiding occupying too much space on the same surface of the middle frame, and realizing a three-in-one antenna structure in an environment with limited antenna clearance.

[0008] Furthermore, the distance between the coupling antenna and the frequency doubling radiation arm is not greater than 4 mm. The distance between the coupling antenna and the frequency doubling radiation arm is controlled to achieve coupling.

[0009] Furthermore, the working frequency band of the first antenna loop is 2400M-2500MHz; the working frequency band of the second antenna loop is the GPS band; and the working frequency band of the third antenna loop is the 5GHz WiFi band. Three working frequency bands are realized by using the stacked coupled dual-branch antenna and the coupled antenna, wherein the working frequency band of the first antenna loop is 2400M-2500MHz, which is suitable for 2.4GHz WiFi and Bluetooth, and the 5GHz WiFi band of the third antenna loop is excited on the basis of the GPS band of the second antenna loop, and the 5GHz WiFi band is three times the GPS band. Therefore, the 2.4GHz WiFi, Bluetooth, GPS and 5GHz WiFi functions are realized on the stacked coupled three-in-one antenna, which is suitable for communication of mobile devices.

[0010] Furthermore, the length of the coupling antenna is 1 / 2 of the wavelength of the third antenna loop.

[0011] Furthermore, the first radiation arm and the frequency doubling radiation arm are both bent, which is beneficial for saving space.

[0012] Furthermore, the frequency-doubling radiation arm is bent to form an accommodation area, and the first radiation arm is bent and partially located in the accommodation area.

[0013] Furthermore, the length of the first radiating arm is 1 / 4-1 / 2 of the wavelength of the first antenna loop.

[0014] The utility model also provides a mobile device, comprising a shell, a middle frame and the above-mentioned laminated coupled three-in-one antenna; the middle frame is arranged in the shell; the laminated coupled three-in-one antenna is arranged in the middle frame, and the dual-branch antenna and the coupling antenna are located on different surfaces of the middle frame.

[0015] Furthermore, the middle frame includes a mounting plate for placing the mainboard and a side frame arranged on the side of the mounting plate, the dual-branch antenna is arranged on the inner side of the side frame, and the coupling antenna is arranged on a side of the mounting plate away from the mainboard. The design of the dual-branch antenna and the coupling antenna on the middle frame is conducive to saving antenna space and enhancing antenna efficiency through coupling parasitism.

[0016] Furthermore, the thickness of the middle frame is not greater than 1.5 mm.

[0017] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the middle frame of Example 1.

[0019] Figure 2 It is a schematic diagram of the structure of the dual-branch antenna of Example 1.

[0020] Figure 3 It is a schematic diagram of the structure of the coupled antenna in Example 1.

[0021] Figure 4 It is the S11 diagram of the stacked coupled three-in-one antenna of Example 1.

[0022] Figure 5 1 is an antenna efficiency curve diagram of the stacked coupled three-in-one antenna of Example 1. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the embodiments of the utility model in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the embodiments of the utility model, rather than to limit the embodiments of the utility model. It should also be noted that, for ease of description, only parts related to the embodiments of the utility model are shown in the accompanying drawings, rather than all structures.

[0024] In addition, the terms first, second, third, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0025] Similarly, the terms "fixed" and "connected" used in the specification and claims should not be construed as limited to direct connection. Therefore, the expression "device A is connected to device B" should not be limited to a device or system in which device A is directly connected to device B, but means that there is a path between device A and device B, which may be a path including other devices or tools.

[0026] Example 1

[0027] This embodiment provides a stacked coupled three-in-one antenna. Figure 1 It is a schematic diagram of the structure of the middle frame 3. Figure 2 is a schematic diagram of the structure of a dual-branch antenna 1, Figure 3 is a schematic diagram of the structure of the coupling antenna 2, see Figure 1-3 , including a double-branch antenna 1 and a coupling antenna 2 for being arranged on different surfaces of a middle frame 3; the double-branch antenna 1 includes a feeding point, a common radiation section 12, a grounding point 13, a first radiation arm 14 and a frequency doubling radiation arm 15; the feeding point and the grounding point 13 are connected through the common radiation section 12; one end of the first radiation arm 14 is connected to the feeding point, and the other end extends in a direction away from the grounding point 13, and the feeding point, the first radiation arm 14 and the grounding point 13 form a first antenna loop; one end of the frequency doubling radiation arm 15 is connected to the grounding point 13, and the other end extends in a direction away from the feeding point, and the feeding point, the frequency doubling radiation arm 15 and the second grounding point 13 form a second antenna loop; the feeding point, the frequency doubling radiation arm 15 and the grounding point 13 form a third antenna loop, the frequency of the third antenna loop is an integer multiple of the frequency of the second antenna loop, and the length of the frequency doubling radiation arm is 3 / 4 of the wavelength of the third antenna loop; the coupling antenna 2 is coupled to the third antenna loop.

[0028] In the stacked coupled three-in-one antenna provided in this embodiment, two resonances are excited by the dual-branch antenna 1 to form a first antenna loop and a second antenna loop, and a third resonance is excited by the frequency-doubling radiation arm 15, and the coupling antenna 2 is coupled with the third resonance to improve the antenna efficiency of the third antenna loop; the dual-branch antenna 1 and the coupling antenna 2 are used to be arranged on different surfaces of the middle frame 3, which is conducive to saving space, avoiding occupying too much space on the same surface of the middle frame 3, and realizing a three-in-one antenna structure in an environment with limited antenna clearance.

[0029] In this embodiment, the distance between the coupling antenna 2 and the frequency doubling radiation arm 15 is not greater than 4 mm. The distance between the coupling antenna 2 and the frequency doubling radiation arm 15 is controlled to achieve parasitic coupling. In practical applications, the distance between the coupling antenna 2 and the frequency doubling radiation arm 15 can be adjusted according to specific needs. The distance between the coupling antenna 2 and the frequency doubling radiation arm 15 means the straight-line distance between the coupling antenna 2 and the frequency doubling radiation arm 15.

[0030] See also Figure 1-3 In one embodiment, the middle frame 3 of the mobile device includes a mounting plate 31 for placing a mainboard and a side frame 32 arranged on the side of the mounting plate 31, the thickness of the mounting plate 31 is not more than 1.5 mm, the dual-branch antenna 1 is arranged on the inner side of the side frame 32, and the coupling antenna 2 is arranged on the side of the mounting plate 31 away from the mainboard. The design of the dual-branch antenna 1 and the coupling antenna 2 on the middle frame 3 is conducive to saving the space occupied by the antenna and enhancing the antenna efficiency through coupling parasitism. In another embodiment, the thickness of the mounting plate 31 is not more than 1.5 mm, and the dual-branch antenna 1 and the coupling antenna 2 are respectively arranged on both sides of the mounting plate 31.

[0031] In this embodiment, the working frequency band of the first antenna loop is 2400M-2500MHz; the working frequency band of the second antenna loop is the GPS band; and the working frequency band of the third antenna loop is the 5GHz WiFi band. The stacked coupled dual-branch antenna 1 and the coupled antenna 2 are used to realize three working frequency bands, wherein the working frequency band of the first antenna loop is 2400M-2500MHz, which is suitable for 2.4GHz WiFi and Bluetooth. The 5GHz WiFi band of the third antenna loop is excited on the basis of the GPS band of the second antenna loop, and the 5GHz WiFi band is three times the GPS band. Therefore, the stacked coupled three-in-one antenna realizes 2.4GHzWiFi, Bluetooth, GPS and 5GHz WiFi functions, which is suitable for communication of mobile devices.

[0032] In this embodiment, the length of the coupling antenna 2 is 1 / 2 of the wavelength of the third antenna loop. The coupling antenna 2 can be in a straight line or a bent shape.

[0033] In this embodiment, the first radiation arm 14 and the frequency doubling radiation arm 15 are both bent, which is beneficial to saving space.

[0034] See also Figure 1-3 In this embodiment, the frequency-doubling radiation arm 15 is bent to form an accommodation area, and the first radiation arm 14 is bent and partially located in the accommodation area. This arrangement can reduce the occupied space of the dual-branch antenna 1, and can achieve multi-band communication under a small antenna clearance, such as an antenna clearance of 2.1 mm. The occupied space of the stacked coupling three-in-one antenna can be controlled within 147 mm*75 mm*7.85 mm or less.

[0035] See also Figure 1-3 In one embodiment, the feeding point and the grounding point 13 are respectively connected to the two ends of the common radiation section 12 and are located on the same side of the common radiation section 12; the first radiation arm 14 includes a first connecting section 141 and a first bending section 142, the first connecting section 141 is connected to the end of the feeding point away from the grounding point 13 and extends in a direction away from the grounding point 13, and the first bending section 142 is connected to the first connecting section 141 and bent; the frequency doubling radiation arm 15 includes a second connecting section 151 and a second bending section 152, the second connecting section 151 is connected to the end of the grounding point 13 away from the feeding point and extends in a direction away from the feeding point, the second bending section 152 is connected to the second connecting section 151 and bent to form an accommodating area, and a portion of the first bending section 142 is located in the accommodating area.

[0036] In this embodiment, the length of the first radiation arm 14 is 1 / 4-1 / 2 of the wavelength of the first antenna loop. The length of the first radiation arm 14 is controlled to optimize the antenna efficiency. Since the 5 GHz WiFi band of the third antenna loop is excited on the basis of the GPS band of the second antenna loop, and the 5 GHz WiFi band is three times the GPS band, the length of the frequency-doubled radiation arm 15 is set to 3 / 4 times the wavelength of the 5 GHz WiFi band, that is, 1 / 4 of the wavelength of the GPS band of the second antenna loop.

[0037] Figure 4 This is the S11 diagram of the stacked coupled triple antenna. Figure 4The feeding point, the first radiating arm 14 and the grounding point 13 form a first antenna loop, generating a 2400M-2500MHz resonance, and the return loss is (-10.4) ~ (-8.4) dB; the feeding point, the frequency doubling radiating arm 15 and the second grounding point 13 form a second antenna loop, generating a 1575MHz resonance, and the return loss is -12.9 dB; the feeding point, the frequency doubling radiating arm 15 and the grounding point 13 form a third antenna loop, and the coupling antenna 2 is coupled to the third antenna loop to generate a 5150-5850MHz resonance, and the return loss is (-10.7) ~ (-8.0) dB.

[0038] Figure 5 This is the antenna efficiency curve of the stacked coupled three-in-one antenna. Figure 5 The feeding point, the first radiation arm 14 and the grounding point 13 form a first antenna loop, generating a 2400M-2500MHz resonance, and the antenna efficiency is (-6)~(-5)dB; the feeding point, the frequency doubling radiation arm 15 and the second grounding point 13 form a second antenna loop, generating a 1575MHz resonance, and the antenna efficiency is (-7.5)~(-5)dB; the feeding point, the frequency doubling radiation arm 15 and the grounding point 13 form a third antenna loop, and the coupling antenna 2 is coupled with the third antenna loop to generate a 5150-5850MHz resonance, and the antenna efficiency is (-6.5)~(-4)dB.

[0039] The stacked coupled three-in-one antenna provided in this embodiment forms an IFA structure through a dual-branch antenna 1 to generate a 2.4G / BT band (2400M-2500M) and a GPS band (1575M), and generates a 5G WiFi band (5150M-5850M) with a shallower frequency multiplication. The 5G WiFi band (5150M-5850M) is optimized by parasitic coupling using a single-pole sub-sub on the back of the middle frame 3. The stacked coupled three-in-one antenna occupies a small space and can realize multiple frequency band communications under a small antenna clearance, such as an antenna clearance of 2.1mm. The occupied space of the stacked coupled three-in-one antenna can be controlled to 147mm*75mm*7.85mm, and the antenna efficiency is good.

[0040] Example 2

[0041] This embodiment provides a mobile device, including a shell, a middle frame 3 and the above-mentioned laminated coupled three-in-one antenna; the middle frame 3 is arranged in the shell; the laminated coupled three-in-one antenna is arranged in the middle frame 3, and the dual-branch antenna 1 and the coupling antenna 2 are located on different surfaces of the middle frame 3.

[0042] In this embodiment, the middle frame 3 includes a mounting plate 31 for placing the mainboard and a side frame 32 arranged on the side of the mounting plate 31. The dual-branch antenna 1 is arranged on the inner side of the side frame 32, and the feeding point and the grounding point 13 are respectively connected to the mainboard through metal springs; the coupling antenna 2 is arranged on the side of the mounting plate 31 away from the mainboard, and generates coupling parasitism with the dual-branch antenna 1. The design of the dual-branch antenna 1 and the coupling antenna 2 on the middle frame 3 is conducive to saving the space occupied by the antenna and enhancing the antenna efficiency through coupling parasitism. Specifically, the dual-branch antenna 1 is arranged on the side frame 32 through an FPC substrate, and the coupling antenna 2 is arranged on one side of the mounting plate 31 through a substrate.

[0043] In this embodiment, the thickness of the middle frame 3 is no more than 1.5 mm.

[0044] The mobile device of this embodiment may be a smart device such as a mobile phone, a tablet, or a smart watch.

[0045] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the claims of the present invention and the scope of equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A stacked coupled three-in-one antenna, characterized in that: It includes a double-branch antenna and a coupling antenna for being arranged on different surfaces of the middle frame; The dual-branch antenna comprises a feeding point, a common radiation section, a ground point, a first radiation arm and a frequency-doubling radiation arm; The feeding point and the grounding point are connected through the common radiation section; one end of the first radiation arm is connected to the feeding point, and the other end extends in a direction away from the grounding point, and the feeding point, the first radiation arm and the grounding point form a first antenna loop; one end of the frequency doubling radiation arm is connected to the grounding point, and the other end extends in a direction away from the feeding point, and the feeding point, the frequency doubling radiation arm and the grounding point form a second antenna loop; the feeding point, the frequency doubling radiation arm and the grounding point form a third antenna loop, the frequency of the third antenna loop is an integer multiple of the frequency of the second antenna loop, and the length of the frequency doubling radiation arm is 3 / 4 of the wavelength of the third antenna loop; The coupling antenna is coupled to the third antenna loop.

2. The stacked coupled three-in-one antenna according to claim 1, characterized in that: The distance between the coupling antenna and the frequency doubling radiation arm is no more than 4 mm.

3. The stacked coupled three-in-one antenna according to any one of claims 1 to 2, characterized in that: The operating frequency band of the first antenna loop is 2400M-2500MHz; The operating frequency band of the second antenna loop is the GPS frequency band; The operating frequency band of the third antenna loop is the 5 GHz WiFi frequency band.

4. The stacked coupled three-in-one antenna according to claim 3, characterized in that: The length of the coupling antenna is 1 / 2 of the wavelength of the third antenna loop.

5. The stacked coupled three-in-one antenna according to claim 3, characterized in that: The first radiation arm and the frequency-doubling radiation arm are both bent.

6. The stacked coupled three-in-one antenna according to claim 5, characterized in that: The frequency-doubling radiation arm is bent to form an accommodation area, and the first radiation arm is bent and partially located in the accommodation area.

7. The stacked coupled three-in-one antenna according to claim 3, characterized in that: The length of the first radiating arm is 1 / 4-1 / 2 of the wavelength of the first antenna loop.

8. A mobile device, characterized in that: A three-in-one antenna comprising a housing, a middle frame and the laminated coupling according to any one of claims 1 to 7; The middle frame is arranged in the shell; the stacked coupled three-in-one antenna is arranged in the middle frame, and the dual-branch antenna and the coupled antenna are located on different surfaces of the middle frame.

9. The mobile device according to claim 8, characterized in that: The middle frame includes a mounting plate for placing the mainboard and a side frame arranged on the side of the mounting plate, the dual-branch antenna is arranged on the inner side of the side frame, and the coupling antenna is arranged on the side of the mounting plate away from the mainboard.

10. The mobile device according to claim 9, characterized in that: The thickness of the middle frame is not greater than 1.5 mm.

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