Full-screen metal frame antenna structure

Abstract

The utility model provides a full-screen metal frame antenna structure, and belongs to the field of antenna structures. The full-screen metal frame antenna structure comprises a first antenna and a second antenna which are integrally arranged, the first antenna and the second antenna are arranged on the outer surface of a metal frame, the first antenna is provided with a first ground feed point and a first feed point, and the second antenna is provided with a second ground feed point and a second feed point. The first ground feed point and the second ground feed point are arranged adjacently or commonly, and the first antenna and the second antenna are arranged in opposite radiation directions. The beneficial effects of the utility model are that the isolation degree of the two antennas is effectively improved, and mutual interference is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to antenna structure field, concretely relates to a full screen metal frame antenna structure. BACKGROUND

[0002] From the first generation of cellular mobile communication system (1G) in the 1980s to the later 2G, 3G, 4G and even 5G, each generation of system is constantly improving data transmission rate, increasing bandwidth, improving security and stability. And on the smart device, such as mobile phone, set up communication antenna also with the development of communication technology, the requirement is higher and higher.

[0003] At present, the antenna of smart device mainly has the following several forms:

[0004] I. External antenna: external antenna is the first member of antenna series in mobile phone field, it appeared on the first commercial mobile phone Motorola DynaTAC 8000X in 1983. Because the external radiation antenna can obtain larger clearance, and the environment around the antenna is simple, so the antenna performance is good;

[0005] II. Built-in antenna: built-in antenna appeared in the late 20th century and has been widely used. The design of built-in antenna makes the mobile phone more beautiful and portable;

[0006] III. Metal frame antenna: since 2010, metal frame antenna scheme has been widely used in smart phone design. The body of the mobile phone is wrapped by two stainless steel metals, which skillfully integrates UMTS, GSM network and Bluetooth, Wi-Fi, GPS antenna. Metal frame antenna has excellent polarization characteristics, reliable signal transmission and simple structure and durability. It can well match the polarization mode of wireless signal source, realize more stable signal transmission; at the same time, the antenna has high gain, can well receive weak signal and shield noise, and improve communication quality and signal transmission distance.

[0007] Therefore, metal frame antenna is widely used in wireless communication field, including mobile phone, Internet of things, vehicle-mounted communication, etc. In mobile phone, because the metal frame is built in the mobile phone shell, the metal frame antenna can meet the needs of mobile phone signal receiving and sending without occupying extra space.

[0008] Although this design of metal frame makes the whole machine more integrated, there is also the problem of mutual interference between multiple antennas, which leads to the decline of signal receiving quality. Therefore, how to improve the isolation degree between antennas and reduce mutual interference is the main research direction at present. INVENTION CONTENTS

[0009] The full-screen metal frame antenna structure improves the isolation of the antenna and reduces mutual interference.

[0010] The full-screen metal frame antenna structure comprises a first antenna and a second antenna which are integrally arranged, the first antenna and the second antenna are arranged on the outer surface of the metal frame, the first antenna is provided with a first ground feed point and a first feed point, the second antenna is provided with a second ground feed point and a second feed point, the first ground feed point and the second ground feed point are adjacent or commonly arranged, and the first antenna and the second antenna are arranged in the opposite radiation directions of each other.

[0011] Further, the first antenna adopts an IFA antenna form, the second antenna adopts a LOOP antenna form, the length of the first antenna ranges from 50 mm to 70 mm, the distance between the first ground feed point and the first feed point is greater than 10 mm, and the length of the second antenna ranges from 15 mm to 25 mm.

[0012] Further, the distance between the first antenna and the reference ground is greater than 2.3 mm.

[0013] Further, the first antenna and the second antenna are arranged on the lower outer surface of the metal frame, and further comprise an antenna group arranged on the upper outer surface of the metal frame, a plurality of antennas of the antenna group are sequentially arranged along the outer surface of the metal frame, the metal frame is provided with metal strips connected with the ground ends of the antennas of the antenna group, respectively, the number of the metal strips is two, and the two metal strips are arranged on the two sides of the metal frame, respectively, and a first breakpoint is arranged between the two metal strips and the end portions of the first antenna and the second antenna.

[0014] Further, the metal frame is connected with the antenna group, the first antenna and the metal strips to form an integral whole, and an insulating plastic part is arranged to enhance the strength of the metal frame.

[0015] Further, the antenna group comprises six antennas, i.e., a third antenna, a fourth antenna, a fifth antenna, a sixth antenna, a seventh antenna and an eighth antenna, the antennas in the antenna group and the first antenna and the second antenna form a four-transmitting and four-receiving 5G antenna, wherein the first antenna is defined as an LB main antenna, the second antenna is defined as a 5G DRX antenna, the third antenna is defined as a 5G Mimo3 antenna, the fourth antenna is defined as an MHB DRX antenna, the fifth antenna is defined as an LB DRX / MHB main antenna, the sixth antenna is defined as a 5G main antenna, the seventh antenna is defined as a GPS / WIFI / BT antenna, and the eighth antenna is defined as a 5G Mimo4 antenna.

[0016] Further, the first antenna to the eighth antenna are sequentially arranged on the outer surface of the metal frame in a counterclockwise order, the fifth antenna and the seventh antenna adopt an IFA antenna form, and the third antenna, the fourth antenna, the sixth antenna and the eighth antenna adopt a LOOP antenna form.

[0017] Further, a second breakpoint is arranged between the third antenna and the fourth antenna, the third antenna and the fourth antenna adopt a symmetric coupling LOOP antenna arrangement on the two sides of the second breakpoint, and the two antennas are coupled with each other, wherein the ground end of the third antenna away from the second breakpoint is connected with the metal strip of the side edge, the reference ground is connected through the metal strip, the fourth ground feed point of the fourth antenna is arranged away from the second breakpoint, the third feed point of the third antenna and the fourth feed point of the fourth antenna are adjacent and arranged on the two sides of the second breakpoint respectively, and the positions and the interval of the third feed point and the fourth feed point are adjusted to adjust the resonance of the antenna.

[0018] Further, the fifth antenna is provided with a fifth ground feed point and a fifth feed point, the fifth ground feed point and the fourth ground feed point are adjacent or arranged in a shared mode, and the fourth antenna and the fifth antenna are arranged in a back radiation direction with each other.

[0019] Further, a third breakpoint is arranged between the sixth antenna and the seventh antenna, a fourth breakpoint is arranged between the seventh antenna and the eighth antenna, the ground end of the eighth antenna is connected with the metal strip of the side edge, the reference ground is connected through the metal strip, the length of the sixth antenna and the eighth antenna ranges from 15mm to 25mm, and the sixth antenna and the eighth antenna are arranged vertically on the metal frame, and the interval between the seventh ground feed point and the seventh feed point of the seventh antenna is greater than 5mm.

[0020] Compared with the prior art, the beneficial effects of the present application are that: by arranging the first antenna and the second antenna as a whole, the number of breakpoints of the outer frame is reduced, the strength and appearance of the outer frame are improved, the user satisfaction is improved, by arranging the ground feed points of the first antenna and the second antenna adjacent to each other or in a shared mode, the two antennas are arranged in a back-to-back mode with opposite radiation directions, the isolation degree of the two antennas can be effectively improved, the mutual interference is reduced, and the performance of the antenna can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the schemes in the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0022] Figure 1 It is an embodiment structure diagram of the present application.

[0023] Figure 2 Structure block diagram of the second embodiment of the utility model;

[0024] Figure 3 Intelligent device side structure schematic diagram;

[0025] Figure 4 First antenna performance test result curve diagram;

[0026] Figure 5 Second antenna performance test result curve diagram;

[0027] Figure 6 Third antenna performance test result curve diagram;

[0028] Figure 7 Fourth antenna performance test result curve diagram;

[0029] Figure 8 Fifth antenna performance test result curve diagram;

[0030] Figure 9 Sixth antenna performance test result curve diagram;

[0031] Figure 10 Seventh antenna first frequency band performance test result curve diagram;

[0032] Figure 11 Seventh antenna second frequency band performance test result curve diagram;

[0033] Figure 12 Eighth antenna performance test result curve diagram. DETAILED DESCRIPTION

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting upon the application; the description and the drawings are to be regarded as illustrative in nature and definitions in the specification are to be interpreted consistent with the foregoing principles. The terms "comprising," "having," "including," and "containing" are to be construed as open-ended terms (i.e., meaning "including, but not limited to,") unless otherwise noted. The terms "first," "second," and the like, as used herein do not have their ordinary meanings, but are used only to distinguish one element from another.

[0035] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to mutually exclusive, independent, or alternative embodiments to other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this disclosure may be combined with other embodiments.

[0036] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] like Figure 1 As shown, as an embodiment of the present invention, the full-screen metal frame antenna structure of this example is applied to a mobile phone. The present invention includes an integrally arranged first antenna 101 and a second antenna 102, and the first antenna 101 and the second antenna 102 are arranged on the outer surface of the metal frame 100. The first antenna 101 is provided with a first ground feed point 1012 and a first feeding point 1011, and the second antenna 102 is provided with a second ground feed point 1022 and a second feeding point 1021. The first ground feed point 1012 and the second ground feed point 1022 are arranged adjacent to each other, and the first antenna 101 and the second antenna 102 are arranged in opposite radiation directions to each other.

[0038] The present invention integrates the first antenna 101 and the second antenna 102 into one body, thereby reducing the number of breakpoints of the outer frame, improving the strength and appearance of the outer frame, and enhancing user satisfaction. By placing the ground feed points of the first antenna 101 and the second antenna 102 adjacent to each other and arranging the two antennas in back-to-back orientation with opposite radiation directions, the isolation between the two antennas can be effectively improved, mutual interference can be reduced, and antenna performance can be effectively improved.

[0039] Preferably, the two ground feeding points of the first antenna 101 and the second antenna 102 in this example can share one ground feeding point, which further improves the isolation between the two antennas and optimizes the overall performance.

[0040] In this example, the first antenna 101 and the second antenna 102 can be arranged below the metal frame 100 or above the mirror image of the metal frame 100 .

[0041] In this example, in order to isolate the first antenna 101 and the second antenna 102 from the metal on the outer surface of the metal frame, a first breakpoint 110 is provided at the end of each of the first antenna 101 and the second antenna 102 to be isolated from the metal frame, thereby avoiding the problem of poor received signal quality caused by the grounding of the radiating ends of the two antennas.

[0042] likeFigure 2 As shown in the drawings, as a preferred embodiment of the utility model, the antenna structure of the example is a four-transmitting and four-receiving 5G antenna, the first antenna 101 and the second antenna 102 are arranged below the metal frame, the example further comprises an antenna group arranged above the metal frame 100 of the mobile phone, two metal strips 111 and 116 are further arranged between the antenna group and the first antenna 101 and the second antenna 102 on both sides of the metal frame 100, the antenna group of the example has a total of six antennas, in order to improve the strength of the metal frame, insulating plastic parts 109 are further filled in the inner side of each antenna, so that the antenna group, the first antenna 101 and the metal strip on the outer surface of the metal frame are connected as a whole.

[0043] By arranging the antennas on the upper and lower sides of the metal frame 100 and arranging the metal strip in the hand-holding area as the reference ground, it is possible to avoid the fingers contacting the antennas when holding the mobile phone as a conductor as much as possible, thereby reducing the influence on the performance of the antennas.

[0044] The first antenna 101 is defined as an LB main antenna, the second antenna 102 is defined as a 5G DRX antenna, the third antenna 103 is defined as a 5G Mimo3 antenna, the fourth antenna 104 is defined as an MHB DRX antenna, the fifth antenna 105 is defined as an LB DRX / MHB main antenna, the sixth antenna 106 is defined as a 5G main antenna, the seventh antenna 107 is defined as a GPS / WIFI / BT antenna, and the eighth antenna 108 is defined as a 5G Mimo4 antenna.

[0045] Preferably, the first to eighth antennas of the example are sequentially arranged on the outer surface of the metal frame in counterclockwise order along the metal frame. Among them, the first antenna, the fifth antenna and the seventh antenna adopt an IFA antenna form, which has the advantages of easy control of the antenna, easy debugging, no need to add many matches to tune the impedance, and strong anti-interference ability of the antenna. The second antenna, the third antenna, the fourth antenna, the sixth antenna and the eighth antenna adopt a LOOP antenna form. This form of antenna has good stability, and is usually used for MHB antenna / 5G antenna with the best performance in a limited space environment. By cross-spaced arrangement of the two forms of antennas, the isolation of each antenna is further improved.

[0046] The following describes each antenna respectively.

[0047] As shown in the drawings, Figure 1 The first antenna 101 of the example adopts an IFA antenna form, the total length of the metal frame required by the antenna is between 50-70mm, the spacing between the first feeding point 1011 and the first ground feeding point 1012 is more than 10mm, the larger the spacing, the wider the bandwidth of the antenna, the spacing d1 between the frame and the reference ground is 2.3mm, the larger the spacing d1, the deeper the return loss, and the higher the power of the antenna.

[0048] The second antenna 102 in this example adopts a LOOP antenna form, and the total length of the metal frame of the antenna needs to be between 15-25mm. The farther the distance between the second feed point 1021 and the second ground feed point 1022, the wider the antenna bandwidth. The antenna resonance can be changed by moving the position of the second ground feed point 1022. Preferably, the first antenna and the second antenna in this example can also use a common ground feed point in the opposite radiation direction of the antenna to improve the isolation of the two antennas, reduce mutual interference, and improve antenna performance.

[0049] like Figure 2 As shown, a second breakpoint 112 is provided between the third antenna 103 and the fourth antenna 104 of this example. The third antenna 103 and the fourth antenna 104 are both high-frequency antennas with an operating frequency between 1.17G and 5G. Therefore, this example adopts a symmetrically coupled LOOP antenna method on both sides of the second breakpoint 112 to couple the two antennas with each other, so that the two antennas parasitize each other and complement each other, thereby improving antenna efficiency and performance.

[0050] The grounding end of the third antenna 103, away from the second breakpoint 112, is connected to the side metal strip 111 and connected to the reference ground via the metal strip 111. The fourth ground feed point 1042 of the fourth antenna 104 is located away from the second breakpoint 112. The third feeding point 1031 of the third antenna 103 and the fourth feeding point 1041 of the fourth antenna 104 are adjacent and are respectively located on both sides of the second breakpoint 112. During debugging, this example adjusts the antenna resonance by adjusting the position and spacing of the third feeding point 1031 and the fourth feeding point 1041, and changes the spacing d2 and d3, that is, the ground-to-air area of ​​the third antenna 103 and the fourth antenna 104, to achieve the wide bandwidth requirements of the two antennas, thereby achieving optimal performance.

[0051] In this example, the fifth antenna 105 is provided with a fifth ground feed point and a fifth feeding point 1051. The design concept of the fifth antenna 105 and the fourth antenna 104 in this example is consistent with that of the first antenna 101 and the second antenna 102. By sharing the fifth ground feed point and the fourth ground feed point 1042 of the fifth antenna 105, the fourth antenna 104 and the fifth antenna 105 are arranged in opposite radiation directions to each other, thereby improving the isolation performance between the two antennas and reducing the number of breakpoints in appearance.

[0052] In this example, a third break point 114 is provided between the sixth antenna 106 and the seventh antenna 107, and a fourth break point 115 is provided between the seventh antenna 107 and the eighth antenna 108. The ground end of the eighth antenna 108 is connected to the metal strip 116 on the side and is connected to the reference ground through the metal strip 116.

[0053] The sixth antenna 106 adopts a LOOP antenna form, and the total length of the antenna is between 15-25 mm. The LOOP form is usually used for MHB antenna / 5G antenna to save the space of the whole machine. The length and width of the gap between the sixth feeding point 1061 and the sixth ground feeding point 1062 of the sixth antenna 106 are adjusted to adjust the antenna bandwidth and frequency point.

[0054] The seventh antenna 107 in the example adopts an IFA antenna form, and the distance between the seventh feeding point 1071 and the seventh ground feeding point 1072 is more than 5 mm. The distance between the antenna and the reference ground d5 is more than 3 mm, and the antenna bandwidth is wider.

[0055] The eighth antenna 108 in the example adopts a LOOP antenna form, and the total length of the antenna is between 15-25 mm. The LOOP form is usually used for MHB antenna / 5G antenna to save the space of the whole machine. The distance between the antenna and the reference ground d6 is adjusted to improve the bandwidth of the antenna, and the position of the eighth feeding point 1081 is adjusted to adjust the resonance of the antenna.

[0056] When the sixth antenna 106, the seventh antenna 107 and the eighth antenna 108 in the example are placed together, the same interference isolation is avoided through reasonable design. Since the sixth antenna 106 and the eighth antenna 108 in the example are in the same frequency band, and the seventh antenna 107 is not in the same frequency as the sixth antenna 106 and the eighth antenna 108, and the working frequency is different, the seventh antenna 107 is placed between the sixth antenna 106 and the eighth antenna 108 to block the mutual interference of the two, and the performance of the antenna is improved. Preferably, the sixth antenna 106 and the eighth antenna 108 in the example are vertically arranged on the metal frame, so that the directivity of the two is greatly different, and the isolation effect is improved.

[0057] As shown in FIG. 1, Figure 3 The metal frame 100 in the example is a middle frame of a mobile phone, which is arranged at the middle part of the side of the mobile phone. A mobile phone screen 200 is arranged in front of the metal frame 100, and a mobile phone back cover 300 is arranged behind the metal frame 100. The thickness of the metal frame 100 in the example can be 7.5 mm. In the example, only six breakpoints are needed for the eight antennas, and the first breakpoint 110 and the second breakpoint 112 are distributed on the upper and lower parts of the mobile phone, which improves the strength and appearance aesthetics of the mobile phone and improves the user experience.

[0058] Test verification

[0059] The utility model discloses a mobile phone equipment, adopts darkroom + network analyzer 5701B to carry out 3D passive efficiency test, tests the gain and efficiency of each antenna, then the antenna gain value explains the superior effect of the utility model.

[0060] As Figures 4-12 The utility model discloses a mobile phone equipment, adopts darkroom + network analyzer 5701B to carry out 3D passive efficiency test, tests the gain and efficiency of each antenna, then the antenna gain value explains the superior effect of the utility model.

[0061] The above described specific embodiment is the preferred embodiment of the utility model, not limited to the specific implementation range of the utility model, the range of the utility model includes and is not limited to the present specific embodiment, all equivalent changes made according to the utility model are within the protection scope of the utility model.

Claims

1. A full-screen metal frame antenna structure, characterized by: It includes an integrally arranged first antenna and a second antenna, the first antenna and the second antenna are arranged on the outer surface of the metal frame, the first antenna is provided with a first ground feed point and a first feeding point, the second antenna is provided with a second ground feed point and a second feeding point, the first ground feed point and the second ground feed point are adjacent to or shared, and the first antenna and the second antenna are arranged in opposite radiation directions to each other.

2. The full-screen metal frame antenna structure according to claim 1, characterized in that: The first antenna is in the form of an IFA antenna, the second antenna is in the form of a LOOP antenna, the length of the first antenna is in the range of 50-70 mm, the distance between the first ground feed point and the first feed point is above 10 mm, and the length of the second antenna is in the range of 15-25 mm.

3. The full-screen metal frame antenna structure according to claim 2, characterized in that: The distance between the first antenna and the reference ground is greater than 2.3 mm.

4. The full-screen metal frame antenna structure according to any one of claims 1 to 3, characterized in that: The first antenna and the second antenna are arranged on the lower outer surface of the metal frame, and also include an antenna group arranged on the upper outer surface of the metal frame. Several antennas of the antenna group are arranged in sequence along the outer surface of the metal frame. The side of the metal frame is provided with metal strips respectively connected to the grounding ends of the antennas of the antenna group. There are two metal strips, which are respectively arranged on both sides of the metal frame. A first breakpoint is provided between the two metal strips and the ends of the first antenna and the second antenna.

5. The full-screen metal frame antenna structure according to claim 4, characterized in that: It also includes an insulating plastic part that connects the antenna group, the first antenna, and the metal strip on the outer surface of the metal frame into a whole to enhance the strength of the metal frame.

6. The full-screen metal frame antenna structure according to claim 4, characterized in that: The antenna group includes 6 antennas, namely the third antenna, the fourth antenna, the fifth antenna, the sixth antenna, the seventh antenna and the eighth antenna. The antennas in the antenna group and the first antenna and the second antenna form a four-transmit and four-receive 5G antenna, wherein the first antenna is defined as the LB main antenna, the second antenna is defined as the 5G DRX antenna, the third antenna is defined as the 5G Mimo3 antenna, the fourth antenna is defined as the MHBDRX antenna, the fifth antenna is defined as the LB DRX / MHB main antenna, the sixth antenna is defined as the 5G main antenna, the seventh antenna is defined as the GPS / WIFI / BT antenna, and the eighth antenna is defined as the 5G Mimo4 antenna.

7. The full-screen metal frame antenna structure according to claim 6, characterized in that: The first antenna to the eighth antenna are arranged in sequence on the outer surface of the metal frame in a counterclockwise order along the metal frame. The fifth antenna and the seventh antenna are in the form of IFA antennas, and the third antenna, the fourth antenna, the sixth antenna and the eighth antenna are in the form of LOOP antennas.

8. The full-screen metal frame antenna structure according to claim 7, characterized in that: A second breakpoint is provided between the third antenna and the fourth antenna, and the third antenna and the fourth antenna are set up with symmetrically coupled LOOP antennas on both sides of the second breakpoint, and the two antennas are coupled to each other, wherein the grounding end of the third antenna away from the second breakpoint is connected to the metal strip on the side and is connected to the reference ground through the metal strip, and the fourth ground feeding point of the fourth antenna is set away from the second breakpoint, and the third feeding point of the third antenna and the fourth feeding point of the fourth antenna are adjacent and are respectively set on both sides of the second breakpoint, and the antenna resonance is adjusted by adjusting the position and spacing of the third feeding point and the fourth feeding point.

9. The full-screen metal frame antenna structure according to claim 8, characterized in that: The fifth antenna is provided with a fifth ground feed point and a fifth feeding point. The fifth ground feed point and the fourth ground feed point are adjacent to or shared with each other. The fourth antenna and the fifth antenna are arranged in opposite radiation directions to each other.

10. The full-screen metal frame antenna structure according to claim 6, characterized in that: A third breakpoint is provided between the sixth antenna and the seventh antenna, a fourth breakpoint is provided between the seventh antenna and the eighth antenna, the grounding end of the eighth antenna is connected to the metal strip on the side and is connected to the reference ground through the metal strip. The lengths of the sixth antenna and the eighth antenna are in the range of 15-25 mm and are vertically arranged on the metal frame. The spacing between the seventh ground feed point and the seventh feeding point of the seventh antenna is greater than 5 mm.

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