Antenna device and mobile terminal

Abstract

The present application provides an antenna device and a mobile terminal, the antenna device comprising: a first antenna, one end of the first antenna is connected to a feeding port; a metal frame, the metal frame comprising a second antenna and open ends provided at both ends of the second antenna, the first antenna is coupled to the second antenna, one end of the second antenna is grounded; an antenna tuning switch, one end of the antenna coordination switch is grounded, and the other end is connected to the other end of the first antenna or to the second antenna. The feeding method of directly connecting the feeding in the prior art is abandoned, and the standing wave ratio characteristics of the wideband are obtained by coupling the feeding, thereby achieving bandwidth widening.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an antenna device and a mobile terminal. Background Art

[0002] Antennas are important components of wireless communication devices and play an indispensable role in the conversion of guided waves in circuits and electromagnetic waves in space. The performance of a mobile phone antenna directly affects its communication effect and user experience. Due to the development of market aesthetics and process technology, the combination of metal frames and full screens has become a major trend in mobile phones today.

[0003] Antenna engineers often make more use of metal frames to achieve the required antenna performance, and then introduce LDS and FPC routing methods to achieve the purpose of supporting more frequency bands. In the existing technical solutions, antenna structures such as LDS are directly connected through the feeding circuit, and then these antenna structures are directly connected to the metal frame to achieve feeding, which limits the broadband range of the metal frame. Summary of the invention

[0004] The present application provides an antenna device and a mobile terminal, which abandon the feeding method of direct connection feeding in the prior art, obtain a wide-band standing wave ratio characteristic through coupled feeding, and thus achieve bandwidth widening.

[0005] In one aspect, the present application provides an antenna device, comprising:

[0006] A first antenna, one end of which is connected to the feeding port;

[0007] A metal frame, wherein the metal frame includes a second antenna and open ends provided at two ends of the second antenna, the first antenna is coupled to the second antenna, and one end of the second antenna is grounded;

[0008] An antenna tuning switch, one end of the antenna coordination switch is grounded, and the other end is connected to the other end of the first antenna or to the second antenna.

[0009] In a possible implementation of the present application, the first antenna is disposed between the two open ends of the metal frame, and one end of the first antenna connected to the feeding port is disposed close to one of the open ends, and the first antenna is disposed between the open end and the antenna tuning switch.

[0010] In a possible implementation of the present application, a coupling distance between the first antenna and the second antenna is 0.1-20 mm.

[0011] In a possible implementation of the present application, the grounded end of the second antenna is away from the end of the first antenna connected to the feeding port, and the antenna tuning switch is arranged between the grounding point of the second antenna and the first antenna.

[0012] In a possible implementation of the present application, the first antenna segment is from the grounding point of the second antenna to the connection point between the second antenna and the antenna tuning switch, the second antenna segment is from the connection point between the second antenna and the antenna tuning switch to the open end away from the grounding point of the second antenna, and the length of the second antenna segment is greater than the length of the first antenna segment.

[0013] In a possible implementation of the present application, the first antenna includes a third antenna segment and a fourth antenna segment, and the length of the third antenna segment is smaller than the length of the fourth antenna segment.

[0014] In a possible implementation of the present application, the antenna tuning switch is a single-pole four-throw switch, one end of the single-pole four-throw switch is grounded, and the other end is connected in series with four resistors, where two resistors form a group, and each group is connected to the first antenna and the second antenna respectively.

[0015] In a possible implementation of the present application, the antenna device further includes a feeding port and a radio frequency unit, one end of the feeding port is used to be connected to the radio frequency unit and to transmit signals to the radio frequency unit, and the other end is connected to the first antenna; and / or;

[0016] The first antenna is one of the LDS antenna and the FPC antenna, or a combination of both.

[0017] On the other hand, the present application also provides a mobile terminal, comprising the antenna device as described in any one of the items.

[0018] In a possible implementation of the present application, the mobile terminal includes a housing, and the first antenna and the antenna tuning switch are respectively disposed on the housing.

[0019] In the present application, the first antenna is connected to the feeding port to realize feeding of the first antenna, and then the first antenna is coupled to the metal frame for feeding, thereby abandoning the feeding method of directly connecting the feeding in the prior art, and obtaining a wide-band standing wave ratio characteristic through coupled feeding, thereby realizing bandwidth widening. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of an antenna device provided in an embodiment of the present application.

[0022] In the figure:

[0023] 1. First antenna, 10. Third antenna segment, 11. Fourth antenna segment, 2. Feed port, 3. Metal frame, 30. Second antenna, 300. First antenna segment, 301. Second antenna segment, 31. Open end, 4. Antenna tuning switch, 40. Resistor, 5. Radio frequency unit. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0029] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the invention can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0030] The implementation scheme of the present application is aimed at the problem that in the prior art, antenna structures such as LDS are directly connected through a feeding circuit, and then these antenna structures are directly connected to the metal frame to achieve feeding, which leads to the broadband range of the metal frame being limited. The implementation scheme of the present application is used to solve this technical problem.

[0031] See also Figure 1 The present application provides an antenna device, comprising: a first antenna 1, a metal frame 3, and an antenna tuning switch 4; one end of the first antenna 1 is connected to a feeding port 2; the metal frame 3 comprises a second antenna 30 and open ends 31 arranged at both ends of the second antenna 30, the first antenna 1 is coupled and connected to the second antenna 30, and one end of the second antenna 30 is grounded; one end of the antenna coordination switch is grounded, and the other end is connected to the other end of the first antenna 1 or to the second antenna 30.

[0032] Specifically, in the embodiment of the present application, the coupling distance between the first antenna 1 and the second antenna 30 is 0.1-20 mm.

[0033] In the present application, the first antenna 1 is connected to the feeding port 2 to realize feeding of the first antenna 1, and then the first antenna 1 is coupled to the metal frame 3 for feeding, thereby abandoning the feeding method of directly connecting the feeding in the prior art, and obtaining a wide-band standing wave ratio characteristic through coupled feeding, thereby realizing bandwidth widening.

[0034] It can be understood that the first antenna 1 can be a corresponding LDS antenna or an FPC antenna, that is, an antenna printed on an antenna bracket by LDS technology, or an antenna formed by FPC wiring attached to the antenna bracket, wherein LDS is a laser direct forming technology, which uses a computer to control the movement of the laser according to the trajectory of the conductive pattern, and projects the laser onto a molded three-dimensional plastic device, activating the circuit pattern within a few seconds to form an antenna.

[0035] It can be understood that the antenna device also includes a feeding port 2 and a radio frequency unit 5, one end of the feeding port 2 is used to connect to the radio frequency unit 5 and transmit signals with the radio frequency unit 5, and the other end is connected to the first antenna 1. The feeding port 2 may include a matching circuit, the feeding point of the matching circuit is connected to one end of the first antenna 1, and the other end of the matching circuit is connected to the radio frequency circuit.

[0036] It can be understood that the metal frame 3 can be a middle frame component of a mobile terminal, such as a mobile phone middle frame, a TV middle frame and other electronic devices, wherein the second antenna 30 is used to couple with the first antenna 1 and provide a frequency band different from the first antenna 1, and the open end 31 is used to limit the length of the second antenna 30, thereby limiting the frequency band of the second antenna 30. It can be understood that the open end 31 is a port without current.

[0037] Among them, it can be understood that the antenna tuning switch 4 is a kind of radio frequency switch, which is directly connected to the antenna and is mainly used to tune the transmission performance of the antenna signal so that it can achieve the best efficiency at any applicable frequency. In the implementation scheme of the present application, by setting one end of the antenna tuning switch 4 to be grounded and the other end to be connected to the other end of the first antenna 1 or to the second antenna 30, the diversity of the antenna bandwidth is achieved, and it can be adjusted according to needs to adapt to different broadband environment requirements.

[0038] In the embodiment of the present application, the first antenna 1 is arranged between the two open ends 31 of the metal frame 3, and the end of the first antenna 1 connected to the feeding port 2 is arranged close to one of the open ends 31, and the first antenna 1 is arranged between the open end 31 and the antenna tuning switch 4.

[0039] It can be understood that in the embodiment of the present application, the first antenna 1 is arranged between the two open ends 31 of the metal frame 3, that is, the length of the first antenna 1 is smaller than the overall length of the second antenna 30, wherein the length is based on the distance between the open ends 31. Since the lengths of the first antenna 1 and the second antenna 30 are different, it can be understood that the first antenna 1 and the second antenna 30 will respectively provide broadband of different frequency bands.

[0040] It can be understood that by setting the end of the first antenna 1 connected to the feeding port 2 close to one of the open ends 31, and the first antenna 1 is arranged between the open end 31 and the antenna tuning switch 4, the antenna tuning switch 4 is kept away from the open end 31 and the feeding port 2 of the metal frame 3, so that the antenna tuning switch 4 is subjected to a smaller voltage, thereby reducing voltage loss, and thus achieving better antenna performance.

[0041] Furthermore, in the embodiment of the present application, the grounded end of the second antenna 30 is away from the end connected to the feeding port 2 of the first antenna 1, and the antenna tuning switch 4 is arranged between the grounding point of the second antenna 30 and the first antenna 1.

[0042] That is, it can be understood that the grounded end of the second antenna 30 is the end away from the first antenna 1 and the feeding port 2, so that the utilization rate of the second antenna 30 between the grounding point of the second antenna 30 and the open end 31 away from the grounding point of the second antenna 30 is increased, that is, the waste of the second antenna 30 is avoided. It can be understood that in the implementation scheme of the present application, the connection point between the antenna tuning switch 4 and the second antenna 30 is any point between the grounding point of the first second antenna 30 and the open end 31 away from the grounding point of the second antenna 30. The specific position can be adjusted according to the actual broadband frequency band requirements, and the present application does not limit it.

[0043] Furthermore, in the embodiment of the present application, the first antenna segment 300 is between the grounding point of the second antenna 30 and the connection point of the second antenna 30 and the antenna tuning switch 4, and the second antenna segment 301 is between the connection point of the second antenna 30 and the antenna tuning switch 4 and the open end 31 away from the grounding point of the second antenna 30, and the length of the second antenna segment 301 is greater than the length of the first antenna segment 300.

[0044] That is, it can be understood that since the first antenna segment 300 included in the second antenna 30 and the second antenna segment 301 and the antenna length included in the first antenna are different, the different antenna frequency bands can be improved and the diversity of the antenna working frequency bands can be improved. For example, when the antenna is working, it can cover the bandwidth range of 600-1200MHz (hereinafter referred to as low frequency), 1800-2200MHz (hereinafter referred to as medium frequency) and 2300-2700MHz (hereinafter referred to as high frequency), which is not specifically limited in the present application.

[0045] Further, in the embodiment of the present application, the first antenna 1 includes a third antenna segment 10 and a fourth antenna segment 11, the length of the third antenna segment 10 is less than the length of the fourth antenna segment 11, wherein the third antenna segment 10 and the fourth antenna segment 11 may be two separate antenna segments and one end of which is electrically connected, and the third antenna segment 10 and the fourth antenna segment 11 may both be the LDS antenna, or both be the FPC antenna, or may be a combination of the two of the LDS antenna and the FPC antenna.

[0046] It is understandable that in other embodiments of the present application, the first antenna segment 300 may also be set as just one antenna segment, which can be selected based on the application scenario and application requirements, and can meet the requirements of electronic products supporting 5G communications. This application does not make any specific limitations.

[0047] It can be understood that the length of the third antenna segment 10 is smaller than the length of the fourth antenna segment 11, and broadbands of different frequency bands can be generated.

[0048] Furthermore, in the implementation scheme of the present application, the antenna tuning switch 4 is a single-pole four-throw switch, one end of the single-pole four-throw switch is grounded, and the other end is connected in series with four resistors 40, wherein two resistors 40 form a group, and each group is connected to the first antenna 1 and the second antenna 30 respectively.

[0049] It can be understood that by connecting different resistors 40 in series to achieve frequency modulation, further frequency modulation is achieved, so that the antenna broadband can adapt to various environmental requirements and has stronger versatility. Specifically, for example, one end of the single-pole four-throw switch is grounded, and the other end is connected in series with one end of four resistors 40R5, R6, R7, and R8, wherein the other ends of R5 and R6 are connected to the first antenna 1 on the antenna bracket, and the other ends of R7 and R8 are connected to a suitable position between the grounding point of the second antenna 30 and the open circuit end 31 of the grounding point.

[0050] It is understandable that the first antenna segment 300, the second antenna segment 301, the third antenna segment 10 and the fourth antenna segment 11 can be set to different lengths according to different frequency band requirements. In the embodiment of the present application, the second antenna segment 301 is a low frequency band, the first antenna segment 301 is a medium frequency band, the third antenna segment 10 is a high frequency band, and the fourth antenna segment 11 is a medium flat segment. If the first antenna 1 only includes one of the third antenna segment 10 or the fourth antenna segment 11.

[0051] In the implementation scheme of the present application, the first antenna 1 only includes the fourth antenna segment 11, that is, only includes the intermediate frequency band, and on this basis, when the capacitance value of R8 connected in series with the antenna tuning switch 4 is selected to be 0.5pF, the low-frequency resonance generated by the second antenna 30 in this mode is close to the low-frequency end of its coverage range, that is, 600MHz-700MHz; when the inductance value of R7 connected in series with the antenna tuning switch 4 is selected to be 1nH, the low-frequency resonance generated by the second antenna 30 in this mode is close to the high-frequency end of its coverage range, that is, 900MHz-1000MHz. Due to the lack of antenna routing for generating high-frequency resonance (that is, the lack of the third antenna segment 10), the antenna resonance in this embodiment can only cover low and intermediate frequencies. The actual application project is a mobile phone antenna with a metal frame 3 solution. The antenna clearance is about 1.5mm (that is, the distance between the antenna and the display screen is 1.55mm), and the metal frame 3 on the top of the mobile phone is used as the second antenna 30. In addition Figure 1 Except for the first antenna 1 trace printed on the antenna bracket as shown in FIG, no other antenna traces are used.

[0052] On the basis of the above implementation scheme, in another implementation scheme of the present application, the first antenna 1 includes a third antenna segment 10 and a fourth antenna segment 11, which are used to cover the intermediate frequency and the high frequency. When the R8 inductance value connected in series with the antenna tuning switch 4 is selected as 100nh, the low-frequency resonance generated by the metal frame 3 antenna in this mode is close to the low-frequency end of its coverage range, that is, 600MHz-700MHz; when the R7 resistor 40 value connected in series with the antenna tuning switch 4 is selected as 0ohm, the low-frequency resonance generated by the metal frame 3 antenna in this mode is close to the high-frequency end of its coverage range, that is, 900MHz-1000MHz. When the R5 inductance value connected in series with the antenna tuning switch 4 is selected as 100nh, the low-frequency resonance generated by the metal frame 3 antenna in this mode is close to the intermediate frequency end of its coverage range, that is, 700MHz-800MHz; when the R6 resistor 40 value connected in series with the antenna tuning switch 4 is selected as 3nH, the low-frequency resonance generated by the metal frame 3 antenna in this mode is close to the high-frequency end of its coverage range, that is, 1000MHz-1200MHz.

[0053] It is understandable that there is only one resonance at low frequency, and the width of this resonance has a limit. When the switch is switched, the resonance position will move, thereby achieving the purpose of covering more frequency points.

[0054] The embodiment of the present application provides an antenna device, which realizes feeding of the first antenna 1 by setting a connection between the first antenna 1 and the feeding port 2, and then realizes feeding by setting the first antenna 1 and the metal frame 3 for coupling feeding, thereby abandoning the feeding method of direct connection feeding in the prior art, and obtaining a wide-band standing wave ratio characteristic through coupled feeding, thereby realizing bandwidth widening. At the same time, by setting the antenna tuning switch 4 to be located at the open end 31 away from the metal frame 3 and the feeding port 2, the antenna tuning switch 4 is subjected to a smaller voltage, thereby reducing voltage loss, and thus being able to achieve better antenna performance.

[0055] Based on the listed implementation plan, the present application also provides a mobile terminal, including an antenna device as described in any of the above implementation plans, including: a first antenna 1, a metal frame 3, and an antenna tuning switch 4; one end of the first antenna 1 is connected to the feeding port 2; the metal frame 3 includes a second antenna 30 and an open end 31 provided at both ends of the second antenna 30, the first antenna 1 is coupled and connected to the second antenna 30, and one end of the second antenna 30 is grounded; one end of the antenna coordination switch is grounded, and the other end is connected to the other end of the first antenna 1 or to the second antenna 30.

[0056] It can be understood that the mobile terminal can be a smart electronic device such as a tablet, a mobile phone, etc., wherein the mobile terminal includes a shell. In the implementation scheme of the present application, the shell is used as an antenna bracket, and the first antenna 1 and the antenna tuning switch 4 are respectively arranged on the shell. The metal middle frame is installed on the shell. The installation can be achieved by bonding, clamping, bolting, etc., which is not limited in this application.

[0057] The implementation scheme of the present application provides a mobile terminal, which realizes feeding of the first antenna 1 by setting a connection between the first antenna 1 and the feeding port 2, and then realizes feeding by setting the first antenna 1 and the metal frame 3 for coupling feeding, thereby abandoning the feeding method of direct connection feeding in the prior art, and obtaining a wide-band standing wave ratio characteristic through coupled feeding, thereby realizing bandwidth widening. At the same time, by setting the antenna tuning switch 4 to be located at the open end 31 away from the metal frame 3 and the feeding port 2, the antenna tuning switch 4 is subjected to a smaller voltage, thereby reducing voltage loss, and thus being able to achieve better antenna performance.

[0058] The above is a detailed introduction to an antenna device and a mobile device provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An antenna device, characterized in that: include: A first antenna, one end of which is connected to the feeding port; A metal frame, wherein the metal frame includes a second antenna and open ends provided at two ends of the second antenna, the first antenna is coupled to the second antenna, and one end of the second antenna is grounded; An antenna tuning switch, wherein the antenna tuning switch is a single-pole four-throw switch, and one end of the single-pole four-throw switch is grounded; as well as Four resistors, wherein the four resistors are grouped in pairs, and each group is connected to the first antenna and the second antenna respectively; the other end of the single-pole four-throw switch is configured to be connected to the four resistors respectively; The first antenna is arranged between the two open ends of the metal frame, and one end of the first antenna connected to the feeding port is arranged close to one of the open ends, and the first antenna is arranged between the open end and the antenna tuning switch.

2. The antenna device according to claim 1, characterized in that The coupling distance between the first antenna and the second antenna is 0.1-20 mm.

3. The antenna device according to claim 1, characterized in that The grounded end of the second antenna is far away from the end of the first antenna connected to the feeding port, and the antenna tuning switch is arranged between the grounding point of the second antenna and the first antenna.

4. The antenna device according to claim 3, characterized in that: The first antenna segment is from the grounding point of the second antenna to the connection point between the second antenna and the antenna tuning switch, and the second antenna segment is from the connection point between the second antenna and the antenna tuning switch to the open end away from the grounding point of the second antenna. The length of the second antenna segment is greater than the length of the first antenna segment.

5. The antenna device according to claim 1, characterized in that: The first antenna includes a third antenna segment and a fourth antenna segment, and a length of the third antenna segment is shorter than a length of the fourth antenna segment.

6. The antenna device according to claim 1, characterized in that: The antenna device further comprises a feeding port and a radio frequency unit, wherein one end of the feeding port is used to be connected to the radio frequency unit and to transmit signals to the radio frequency unit, and the other end of the feeding port is connected to the first antenna; and / or; The first antenna is an LDS antenna and an FPC antenna, or a combination of the two.

7. A mobile terminal, characterized in that: Comprising the antenna device according to any one of claims 1-6.

8. The mobile terminal according to claim 7, characterized in that: The mobile terminal includes a housing, and the first antenna and the antenna tuning switch are respectively arranged on the housing.

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