Double-fed ground mobile phone antenna for MIMO (Multiple Input Multiple Output) and mobile equipment

Abstract

The utility model provides a double-fed ground mobile phone antenna for MIMO (Multiple Input Multiple Output) and mobile equipment. The double-fed ground mobile phone antenna comprises a feeding point, a first radiation arm, a second radiation arm, a first ground point and a second ground point, the first radiation arm and the second radiation arm are respectively connected with the feeding point; the first ground point and the second ground point are located at two sides of the feeding point, the first ground point is connected with the first radiation arm, and the second ground point is connected with the second radiation arm; the first radiation arm is bent and forms a first slot antenna; the feeding point, the first radiation arm and the first ground point form a first antenna loop; the feeding point, the second radiation arm and the second ground point form a second antenna loop; and a second slot antenna is arranged between the feeding point and the second ground point, and the working frequency of the second slot antenna is matched with that of the second antenna loop. According to the utility model, three groups of resonance are provided while the number and the size of the antenna are reduced, and the antenna has good antenna efficiency and is suitable for an MIMO system in mobile equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of mobile equipment, and in particular relates to a dual-feed mobile phone antenna for MIMO and a mobile equipment. Background Art

[0002] The fifth generation of mobile communication technology is developing rapidly, and smart electronic devices are beginning to be equipped with 5G antennas. 5G communication requires the frequency band to have a loan and a multi-antenna system to achieve high-speed data transmission, so the multiple-input and multiple-output antenna system (MIMO) is basically the standard for 5G smart devices. The Sub6 frequency band is basically used for communication in China. The Sub6 frequency band can support MIMO in multiple frequency bands, and each frequency band requires at least 4 antennas. In 5G mobile devices, the Sub6 frequency band needs to support 5G MIMO, WiFi MIMO and GPS antennas, so at least 12 antennas are set in 5G mobile devices. However, with the improvement of the design requirements for smart devices and the popularization of full-screen design, the space available for antenna routing has decreased, while the number of antennas has increased. The narrow routing space affects the radiation effect of each antenna and reduces the antenna efficiency. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and provide a dual-feed mobile phone antenna for MIMO, which can provide three sets of resonance while reducing the number and volume of antennas, has good antenna efficiency, and is suitable for MIMO systems in mobile devices.

[0004] The utility model is realized by the following technical solutions:

[0005] A dual-fed mobile phone antenna for MIMO includes a feeding point, a first radiating arm, a second radiating arm, a first return point and a second return point; the first radiating arm and the second radiating arm are respectively connected to the feeding point, and the extension directions of the first radiating arm and the second radiating arm are different; the first return point and the second return point are located on both sides of the feeding point, the first return point is connected to the first radiating arm, and the second return point is connected to the second radiating arm; the first radiating arm is bent and forms a first slot antenna; the feeding point, the first radiating arm and the first return point form a first antenna loop; the feeding point, the second radiating arm and the second return point form a second antenna loop; a second slot antenna is arranged between the feeding point and the second return point, and the working frequency of the second slot antenna matches that of the second antenna loop.

[0006] In the dual-fed ground-based mobile phone antenna for MIMO provided by the utility model, the first return point and the second return point are set to generate a wider frequency band coverage, which is suitable for the multi-band operation of the MIMO system; the first radiating arm and the second radiating arm are used to excite two groups of resonances, and the structure of the first radiating arm is used to form a first slot antenna, which excites one group of resonances, and the second radiating arm and the structure of the second return point are used to form a second slot antenna, thereby enhancing the antenna efficiency of the second antenna loop. The dual-fed ground-based mobile phone antenna for MIMO provided by the utility model can provide three groups of resonances, has good antenna efficiency, and is suitable for the MIMO system.

[0007] Furthermore, the operating frequency band of the first antenna loop is 1.7-2.2 GHz, and the length of the first radiation arm is 1 / 4-1 / 2 of the operating wavelength of the first antenna loop; the operating frequency band of the first slot antenna is 2.3-2.4 GHz, and the length of the first slot antenna is 1 / 4-1 / 2 of its operating wavelength; the operating frequency band of the second antenna loop is 2.5-2.7 GHz, and the length of the second radiation arm is 1 / 4-1 / 2 of the operating wavelength of the second antenna loop. The dual-fed mobile phone antenna for MIMO has three different operating frequency bands, achieving bandwidth coverage of the medium and high frequencies of 1.7-2.7 GHz.

[0008] Furthermore, the first slot antenna is in a strip shape. The first slot antenna with a regular structure is conducive to achieving a stable phase center, so as to achieve a stable antenna efficiency.

[0009] Furthermore, the width of each portion of the first slot antenna is the same. The width of each portion of the first slot antenna is the same, so that the radiation amount of each portion of the first slot antenna is the same.

[0010] Furthermore, the second slot antenna is in a strip shape. The second slot antenna with a regular structure is conducive to achieving a stable phase center, so as to achieve a stable antenna efficiency.

[0011] Furthermore, the width of the second slot antenna is the same at all locations. The width of the second slot antenna is the same at all locations, so that the radiation amount of the second slot antenna is the same at all locations.

[0012] Furthermore, it also includes a common radiating arm, which is connected to the feeding point, and the first radiating arm and the second radiating arm are respectively connected to one end of the common radiating arm away from the feeding point, and are located on both sides of the common radiating arm; the common radiating arm and the second radiating arm form the second slot antenna.

[0013] Furthermore, the second radiating arm includes a second radiating connection portion and a second radiating bend portion; the second radiating connection portion is in the shape of an elongated strip, one end of the second radiating connection portion is connected to an end of the common radiating arm away from the feeding point, the other end of the second radiating connection portion is connected to the grounding point, and the second radiating connection portion and the common radiating arm form the second slot antenna; the second radiating bend portion is connected to an end of the second radiating connection portion away from the grounding point.

[0014] Furthermore, the second radiation bending portion forms a certain angle with the second radiation connecting portion and extends in a direction away from the first radiation arm; and an extension direction of the second slot antenna is perpendicular to an extension direction of the second radiation bending portion.

[0015] The utility model also provides a mobile device, comprising a shell, a middle frame, a mainboard and a MIMO antenna system; the shell is formed by connecting a front shell and a rear shell; the middle frame is located in the shell, and the mainboard is arranged on the middle frame; the MIMO antenna system comprises a substrate and the above-mentioned dual-fed mobile phone antenna for MIMO; the substrate is located in the shell and is arranged on the rear shell; the dual-fed mobile phone antenna for MIMO is arranged on the substrate; the feeding point, the first grounding point and the second grounding point of the dual-fed mobile phone antenna for MIMO are all electrically connected to the mainboard.

[0016] 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

[0017] Figure 1 It is a schematic diagram of the structure of a dual-feed mobile phone antenna for MIMO in Example 1.

[0018] Figure 2 FIG. 1 is a diagram of the S11 parameters of the dual-feed mobile phone antenna for MIMO in Example 1. FIG.

[0019] Figure 3 FIG. 1 is a diagram showing the antenna efficiency of the dual-feed mobile phone antenna for MIMO in Example 1. FIG. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Example 1

[0024] This embodiment provides a dual-feed mobile phone antenna for MIMO. Figure 1 1 is a schematic diagram of the structure of a dual-fed mobile phone antenna for MIMO of Example 1, wherein the dual-fed mobile phone antenna for MIMO comprises a feeding point 1, a first radiating arm 2, a second radiating arm 3, a first return point 4 and a second return point 5; the first radiating arm 2 and the second radiating arm 3 are respectively connected to the feeding point 1, and the extension directions of the first radiating arm 2 and the second radiating arm 3 are different; the first return point 4 and the second return point 5 are located on both sides of the feeding point 1, the first return point 4 is connected to the first radiating arm 2, and the second return point 5 is connected to the second radiating arm 3; the first radiating arm 2 is bent and forms a first slot antenna 6; the feeding point 1, the first radiating arm 2 and the first return point 4 form a first antenna loop; the feeding point 1, the second radiating arm 3 and the second return point 5 form a second antenna loop; a second slot antenna 7 is arranged between the feeding point 1 and the second return point 5, and the operating frequency of the second slot antenna 7 matches that of the second antenna loop.

[0025] In the dual-fed ground-based mobile phone antenna for MIMO provided in this embodiment, the first return point 4 and the second return point 5 are set to generate a wider frequency band coverage, which is suitable for multi-band operation of the MIMO system; the first radiation arm 2 and the second radiation arm 3 are used to excite two groups of resonances, and the structure of the first radiation arm 2 is used to form a first slot antenna 6 to excite one group of resonances, and the second radiation arm 3 and the structure of the second return point 5 are used to form a second slot antenna 7 to enhance the antenna efficiency of the second antenna loop. The dual-fed ground-based mobile phone antenna for MIMO provided by the utility model can provide three groups of resonances, has good antenna efficiency, and is suitable for MIMO systems.

[0026] In this embodiment, the working frequency band of the first antenna loop is 1.7-2.2GHz, and the length of the first radiation arm 2 is 1 / 4-1 / 2 of the working wavelength of the first antenna loop; the working frequency band of the first slot antenna 6 is 2.3-2.4GHz, and the length of the first slot antenna 6 is 1 / 4-1 / 2 of its working wavelength; the working frequency band of the second antenna loop is 2.5-2.7GHz, and the length of the second radiation arm 3 is 1 / 4-1 / 2 of the working wavelength of the second antenna loop. The dual-fed mobile phone antenna for MIMO has three different working frequency bands, achieving bandwidth coverage of the medium and high frequencies of 1.7-2.7GHz.

[0027] In this embodiment, the dual-feed mobile phone antenna for MIMO also includes a common radiation arm 8, which is connected to the feeding point 1, and the first radiation arm 2 and the second radiation arm 3 are respectively connected to the end of the common radiation arm 8 away from the feeding point 1, and are located on both sides of the common radiation arm 8; the common radiation arm 8 and the second radiation arm 3 form a second slot antenna 7.

[0028] In this embodiment, the first slot antenna 6 is in a strip shape. The first slot antenna 6 with a regular structure is conducive to achieving a stable phase center, so as to achieve a stable antenna efficiency.

[0029] In this embodiment, the width of the first slot antenna 6 is the same at all locations. The width of the first slot antenna 6 is the same at all locations, so that the radiation amount of the first slot antenna 6 is the same at all locations.

[0030] In this embodiment, the second slot antenna 7 is in a strip shape. The second slot antenna 7 with a regular structure is conducive to achieving a stable phase center, so as to achieve a stable antenna efficiency.

[0031] In this embodiment, the width of the second slot antenna 7 is the same at all locations. The width of the second slot antenna 7 is the same at all locations, so that the radiation amount of the second slot antenna 7 is the same at all locations.

[0032] See also Figure 1 The first radiation arm 2 includes a first radiation extension portion 21 and a first radiation bending portion 22. The first radiation extension portion 21 is in the shape of an elongated strip. One end of the first radiation extension portion 21 is connected to an end of the common radiation arm 8 away from the feeding point 1, and the other end of the first radiation extension portion 21 extends in a direction perpendicular to the common radiation arm 8 and is opposite to the extension direction of the second radiation arm 3; one end of the first radiation bending portion 22 is connected to a portion of the first radiation extension portion 21 close to the common radiation arm 8, and the other end is connected to the first grounding point. The second radiation bending portion 32 has at least one bending structure and forms a first elongated strip slot antenna 6.

[0033] See also Figure 1In this embodiment, the second radiation arm 3 includes a second radiation connection portion 31 and a second radiation bending portion 32; the second radiation connection portion 31 is in a long strip shape, one end of the second radiation connection portion 31 is connected to the end of the common radiation arm 8 away from the feeding point 1, and the other end of the second radiation connection portion 31 is connected to the ground point, and the second radiation connection portion 31 and the common radiation arm 8 form a second slot antenna 7; the second radiation bending portion 32 is connected to the end of the second radiation connection portion 31 away from the ground point. By controlling the shape and direction of the second slot antenna 7, the bandwidth of the second antenna loop is enhanced.

[0034] In this embodiment, the second radiation bending portion 32 forms a certain angle with the second radiation connecting portion 31 and extends in a direction away from the first radiation arm 2; the extension direction of the second slot antenna 7 is perpendicular to the extension direction of the second radiation bending portion 32. Figure 1 Specifically, the second radiation bending portion 32 is perpendicular to the second radiation connecting portion 31, and the extension direction of the second slot antenna 7 is perpendicular to the extension direction of the second radiation bending portion 32. The adjustment realizes the coupling effect, improves the impedance matching, covers a shorter bandwidth, and is conducive to reducing the occupied space. The second radiation bending portion 32 is bent to save the occupied space.

[0035] Figure 2 This is the S11 parameter diagram of the dual-feed mobile phone antenna for MIMO. Figure 2 The MIMO dual-fed mobile phone antenna produces uninterrupted resonance at 1.7-2.7GHz, wherein the feed point 1, the first radiation arm 2 and the first return point 4 form a first antenna loop, which produces intermediate frequency resonance at 1.7-2.2GHz, and the return loss is (-10)~(-9)dB; the feed point 1, the first slot antenna 6 and the first return point 4 form a third antenna loop, which produces intermediate frequency resonance at 2.3-2.4GHz, and the return loss is -7dB; the feed point 1, the second radiation arm 3 and the second return point 5 form a second antenna loop, and the second slot antenna 7 enhances the antenna efficiency of the second antenna loop, produces high frequency resonance at 2.5-2.7GHz, and the return loss is -7dB.

[0036] Figure 3 This is a graph of the antenna efficiency of a dual-feed mobile phone antenna for MIMO. Figure 3The feeding point 1, the first radiating arm 2 and the first return point 4 form a first antenna loop, which produces intermediate frequency resonance at 1.7-2.2 GHz, and the antenna efficiency is (-10) to (-8) dB; the feeding point 1, the first slot antenna 6 and the first return point 4 form a third antenna loop, which produces intermediate frequency resonance at 2.3-2.4 GHz, and the antenna efficiency is -10 dB; the feeding point 1, the second radiating arm 3 and the second return point 5 form a second antenna loop, and the second slot antenna 7 enhances the antenna efficiency of the second antenna loop, which produces high frequency resonance at 2.5-2.7 GHz, and the antenna efficiency is (-10) to (-8) dB.

[0037] Example 2

[0038] The utility model provides a mobile device, comprising a shell, a middle frame, a mainboard and a MIMO antenna system; the shell is formed by connecting a front shell and a rear shell; the middle frame is located in the shell, and the mainboard is arranged on the middle frame; the MIMO antenna system comprises a substrate 9 and the above-mentioned MIMO dual-feed mobile phone antenna; the substrate 9 is located in the shell and is arranged on the rear shell; the MIMO dual-feed mobile phone antenna is arranged on the substrate 9; the feeding point 1, the first grounding point and the second grounding point of the MIMO dual-feed mobile phone antenna are all electrically connected to the mainboard.

[0039] The mobile device of the utility model sets the MIMO dual-feed ground antenna on the rear shell. By adopting the MIMO dual-feed ground antenna, the antenna bandwidth is widened, the antenna efficiency is better, the antenna resonance can reach 3, the bandwidth can cover 1700-2700MHz, it does not occupy the space on the mainboard separately, occupies very little equipment space, and has the characteristics of simple design and easy use, thereby reducing costs.

[0040] 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 dual-feed mobile phone antenna for MIMO, characterized in that: It includes a feeding point, a first radiation arm, a second radiation arm, a first return point and a second return point; The first radiation arm and the second radiation arm are respectively connected to the feeding point, and the first radiation arm and the second radiation arm extend in different directions; The first return point and the second return point are located on both sides of the feeding point, the first return point is connected to the first radiation arm, and the second return point is connected to the second radiation arm; The first radiating arm is bent and forms a first slot antenna; The feeding point, the first radiating arm and the first return point form a first antenna loop; The feeding point, the second radiating arm and the second return point form a second antenna loop; a second slot antenna is arranged between the feeding point and the second return point, and the operating frequency of the second slot antenna matches that of the second antenna loop.

2. The dual-feed mobile phone antenna for MIMO according to claim 1, characterized in that: The operating frequency band of the first antenna loop is 1.7-2.2 GHz, and the length of the first radiation arm is 1 / 4-1 / 2 of the operating wavelength of the first antenna loop; The operating frequency band of the first slot antenna is 2.3-2.4 GHz, and the length of the first slot antenna is 1 / 4-1 / 2 of its operating wavelength; The operating frequency band of the second antenna loop is 2.5-2.7 GHz, and the length of the second radiation arm is 1 / 4-1 / 2 of the operating wavelength of the second antenna loop.

3. The dual-feed mobile phone antenna for MIMO according to claim 1, characterized in that: The first slot antenna is in a strip shape.

4. The dual-feed mobile phone antenna for MIMO according to claim 3, characterized in that: The width of the first slot antenna is the same at all locations.

5. The dual-feed mobile phone antenna for MIMO according to claim 1, characterized in that: The second slot antenna is in a strip shape.

6. The dual-feed mobile phone antenna for MIMO according to claim 5, characterized in that: The width of the second slot antenna is the same at all locations.

7. The dual-feed mobile phone antenna for MIMO according to claim 1, characterized in that: It also includes a common radiating arm, which is connected to the feeding point. The first radiating arm and the second radiating arm are respectively connected to one end of the common radiating arm away from the feeding point and are located on both sides of the common radiating arm; the common radiating arm and the second radiating arm form the second slot antenna.

8. The dual-feed mobile phone antenna for MIMO according to claim 7, characterized in that: The second radiating arm comprises a second radiating connection portion and a second radiating bending portion; the second radiating connection portion is in a strip shape, one end of the second radiating connection portion is connected to an end of the common radiating arm away from the feeding point, the other end of the second radiating connection portion is connected to the second return point, and the second radiating connection portion and the common radiating arm form the second slot antenna; The second radiation bending portion is connected to an end of the second radiation connecting portion away from the second return point.

9. The dual-feed mobile phone antenna for MIMO according to claim 8, characterized in that: The second radiation bending portion forms a certain angle with the second radiation connecting portion and extends in a direction away from the first radiation arm; the extension direction of the second slot antenna is perpendicular to the extension direction of the second radiation bending portion.

10. A mobile device, characterized in that: Including shell, middle frame, mainboard and MIMO antenna system; The housing is formed by connecting a front housing and a rear housing; the middle frame is located inside the housing, and the mainboard is disposed in the middle frame; The MIMO antenna system includes a substrate and the dual-fed mobile phone antenna for MIMO as described in any one of claims 1-9; the substrate is located in the shell and is arranged on the back shell; the dual-fed mobile phone antenna for MIMO is arranged on the substrate; the feeding point, the first grounding point and the second grounding point of the dual-fed mobile phone antenna for MIMO are all electrically connected to the mainboard.

Images