Antenna module and terminal equipment

Abstract

The invention provides an antenna module and terminal equipment. The antenna module comprises an antenna structure and a tuning circuit. The antenna structure comprises an intrinsic antenna branch knot, a parasitic antenna branch knot, a feed end and a grounding end. The intrinsic antenna branches and the parasitic antenna branches are arranged at intervals through the breaking joints. The tuning circuit is electrically connected between the intrinsic antenna branch knot and the feed end, and is electrically connected with the grounding end. The tuning circuit includes a plurality of tuning elements and a tuning switch electrically connected to the plurality of tuning elements. The tuning switch switches different tuning elements to be electrically connected between the feed end and the intrinsic antenna branch knot, at least an antenna working in a first frequency range is formed between the feed end and the tail end, close to the parasitic antenna branch knot, of the intrinsic antenna branch knot, and an antenna working in a second frequency range is formed by the parasitic antenna branch knot. The first frequency range is larger than the second frequency range. According to the antenna module, on the basis of meeting the domestic SAR laws and regulations, the antenna power drop amplitude can be reduced, and the influence on the user experience is avoided.

Description

Technical Field

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

[0002] Currently, mobile terminals integrate traditional antenna solutions, using an IFA (Inverted F Antenna) antenna plus parasitics through antenna matching circuit tuning. To achieve this balance, they must meet domestic SAR (Specific Absorption Rate) regulations while also ensuring performance. Meeting these regulations requires significant reductions in terminal device antenna power. This power reduction can lead to a decrease in signal strength, impacting user experience, such as reduced signal coverage and decreased communication quality. Summary of the Invention

[0003] The present application provides an improved antenna module and terminal device.

[0004] The present application provides an antenna module, comprising:

[0005] An antenna structure comprising an intrinsic antenna branch, a parasitic antenna branch, a feeding terminal and a ground terminal; the intrinsic antenna branch and the parasitic antenna branch are spaced apart by a slit; and

[0006] A tuning circuit is electrically connected between the intrinsic antenna branch and the feeding end, and is electrically connected to the ground end; the tuning circuit includes a plurality of tuning elements and a tuning switch electrically connected to the plurality of tuning elements; the tuning switch switches different tuning elements to be electrically connected between the feeding end and the intrinsic antenna branch, so that at least an antenna operating in a first frequency range is formed from the feeding end to the end of the intrinsic antenna branch close to the parasitic antenna branch, and the parasitic antenna branch is formed into an antenna operating in a second frequency range; wherein the first frequency range is greater than the second frequency range.

[0007] Preferably, the tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor and a second tuning inductor; when the tuning switch is switched to the first state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, and the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, so that an antenna operating in the first frequency range is formed between the feeding end and the end of the intrinsic antenna branch close to the parasitic antenna branch.

[0008] Preferably, the tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, a second tuning inductor and a third tuning inductor; when the tuning switch is switched to the second state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, and the third tuning inductor is electrically connected between the first tuning capacitor and the ground end, so that the parasitic antenna branch forms an antenna operating in the second frequency range.

[0009] Preferably, the tuning switch switches the different tuning elements to be electrically connected between the feeding end and the intrinsic antenna branch, and also enables the intrinsic antenna branch to form at least one antenna operating in a third frequency range; the third frequency range is smaller than the second frequency range.

[0010] Preferably, the tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor and a second tuning inductor; when the tuning switch is switched to a third state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, and the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, so that the intrinsic antenna branch forms a first antenna operating in the third frequency range.

[0011] Preferably, the tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, a second tuning inductor and a fourth tuning inductor; when the tuning switch is switched to the fourth state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, and the fourth tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, so that the intrinsic antenna branch forms a second antenna operating in the third frequency range, and the frequency range of the second antenna is smaller than the frequency range of the first antenna.

[0012] Preferably, the tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, a second tuning inductor, a fifth tuning inductor and a sixth tuning inductor; when the tuning switch is switched to the fourth state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, the fifth tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, and the sixth tuning inductor is electrically connected between the first tuning capacitor and the ground end, so that the intrinsic antenna branch forms a third signal operating in the third frequency range, and the frequency range of the third signal is greater than the frequency range of the first antenna.

[0013] Preferably, the length from the feeding end to the end of the intrinsic antenna branch close to the parasitic antenna branch is at least 1 / 4 wavelength.

[0014] Preferably, the length of the intrinsic antenna branch is at least 1 / 4 wavelength.

[0015] Preferably, the length of the parasitic antenna branch is at least 1 / 4 wavelength.

[0016] The present application also provides a terminal device, comprising: an antenna module as described in any one of the above embodiments.

[0017] Preferably, the terminal device includes a metal frame, and the metal frame includes a first metal frame and a second metal frame, and the first metal frame and the second metal frame are arranged with a gap interval; wherein part of the first metal frame serves as the intrinsic antenna branch, and part of the second metal frame serves as the parasitic antenna branch.

[0018] Preferably, at least one first groove is provided on the inner side of the first metal frame.

[0019] Preferably, at least one second groove is provided on the inner side of the second metal frame.

[0020] Preferably, the plurality of tuning elements and the tuning switch are integrated on the same circuit board.

[0021] Preferably, a clearance area is provided between the circuit board and the first metal frame.

[0022] Preferably, a clearance area is provided between the circuit board and the second metal frame.

[0023] The antenna module and terminal device provided in the embodiments of the present application are characterized in that the antenna module is provided with an antenna structure and a tuning circuit. The antenna structure is provided with an intrinsic antenna branch, a parasitic antenna branch, a feeding end and a grounding end. The intrinsic antenna branch serves as the main radiator, and the parasitic antenna branch serves as the auxiliary radiator. The tuning switch is electrically connected between the feeding end and the intrinsic antenna branch by switching different tuning elements. On the one hand, an antenna operating in a first frequency range is formed between the feeding end and the end of the intrinsic antenna branch close to the parasitic antenna branch. On the other hand, the parasitic antenna branch is formed into an antenna operating in a second frequency range. The first frequency range is set to be greater than the second frequency range, so that the parasitic antenna branch forms an antenna relatively lower than the first frequency range, and the feeding end forms an antenna relatively higher than the second frequency range. This can reduce the impact of the parasitic antenna branch on the antenna performance in the high frequency range. On the basis of meeting domestic SAR regulations, it can reduce the antenna power reduction and avoid affecting the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0025] Figure 1 Shown is a circuit diagram of an embodiment of the antenna module of the present application.

[0026] Figure 2 Shown Figure 1 A circuit diagram of an embodiment of a tuning circuit for an antenna module is shown.

[0027] Figure 3 Shown Figure 1 A circuit diagram of another embodiment of a tuning circuit for an antenna module is shown.

[0028] Figure 4 Shown Figure 1 A circuit diagram of another embodiment of a tuning circuit of an antenna module is shown.

[0029] Figure 5 Shown Figure 1 A circuit diagram of another embodiment of a tuning circuit of an antenna module is shown.

[0030] Figure 6 Shown Figure 1 A circuit diagram of another embodiment of a tuning circuit for an antenna module is shown.

[0031] Figure 7 Shown is a schematic structural diagram of an embodiment of the terminal device of the present application.

[0032] Figure 8 Shown Figure 7 A partial enlarged view of point B of the metal frame of the terminal device is shown. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0034] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the art to which this application belongs. The terms "first," "second," and similar words used in this specification and claims do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, the terms "a" or "an" and similar words do not denote a limitation of quantity, but rather indicate the presence of at least one. The terms "plurality" or "several" mean at least two. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper" and similar words are for convenience only and are not intended to limit to a single position or spatial orientation. The terms "include" or "comprising" and similar words mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar words are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect.

[0035] As used in this specification and the appended claims, the singular forms "a," "an," "said," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0036] The present application provides an antenna module and a terminal device. The antenna module includes an antenna structure and a tuning circuit. The antenna structure includes an intrinsic antenna branch, a parasitic antenna branch, a feeding end and a grounding end; the intrinsic antenna branch and the parasitic antenna branch are arranged with a gap. The tuning circuit is electrically connected between the intrinsic antenna branch and the feeding end, and is electrically connected to the grounding end; the tuning circuit includes a plurality of tuning elements and a tuning switch electrically connected to the plurality of tuning elements; the tuning switch switches different tuning elements to be electrically connected between the feeding end and the intrinsic antenna branch, at least forming an antenna operating in a first frequency range from the feeding end to the end of the intrinsic antenna branch close to the parasitic antenna branch, and forming an antenna operating in a second frequency range from the parasitic antenna branch; the first frequency range is greater than the second frequency range.

[0037] The antenna module and terminal device provided in the embodiments of the present application are characterized in that the antenna module is provided with an antenna structure and a tuning circuit. The antenna structure is provided with an intrinsic antenna branch, a parasitic antenna branch, a feeding end and a grounding end. The intrinsic antenna branch serves as the main radiator, and the parasitic antenna branch serves as the auxiliary radiator. The tuning switch is electrically connected between the feeding end and the intrinsic antenna branch by switching different tuning elements. On the one hand, an antenna operating in a first frequency range is formed between the feeding end and the end of the intrinsic antenna branch close to the parasitic antenna branch. On the other hand, the parasitic antenna branch is formed into an antenna operating in a second frequency range. The first frequency range is set to be greater than the second frequency range, so that the parasitic antenna branch forms an antenna relatively lower than the first frequency range, and the feeding end forms an antenna relatively higher than the second frequency range. This can reduce the impact of the parasitic antenna branch on the antenna performance in the high frequency range. On the basis of meeting domestic SAR regulations, it can reduce the antenna power reduction and avoid affecting the user experience.

[0038] The antenna module and terminal device of the present application are described in detail below with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0039] Figure 1 The figure shows a circuit diagram of an embodiment of the antenna module 1 of the present application. The antenna module 1 includes an antenna structure 11 and a tuning circuit 12. The antenna structure 11 is used to transmit or receive radiation signals. The tuning circuit is used to adjust the resonant frequency of the antenna structure 11. Figure 1In the illustrated embodiment, the antenna structure 11 includes an intrinsic antenna branch 111, a parasitic antenna branch 112, a feeding end 113, and a grounding end 114. The intrinsic antenna branch 111 and the parasitic antenna branch 112 are arranged with a gap between them. The parasitic antenna branch 112 is arranged away from the feeding end 113 relative to the intrinsic antenna branch 111, and a gap is arranged between the parasitic antenna branch 112 and the intrinsic antenna branch 111. The parasitic intrinsic antenna branch 111 serves as the main radiator, and the parasitic antenna branch 112 serves as the auxiliary radiator, both of which are used to transmit or receive electromagnetic waves. The feeding end 113 is used to feed in or out frequency band signals. The tuning circuit 12 is electrically connected between the intrinsic antenna branch 111 and the feeding end 113, and is electrically connected to the grounding end 114. The tuning circuit 12 is electrically connected between the intrinsic antenna branch 111 and the feeding end 113. The resonant frequency of the intrinsic antenna branch 111 or the parasitic antenna branch 112 can be adjusted by the tuning circuit 12. The antenna branch 112 assists the intrinsic antenna branch 111 in operation, thereby expanding the operating frequency band of the antenna module 1 and improving the antenna's directivity.

[0040] exist Figure 1In the illustrated embodiment, the tuning circuit 12 includes a plurality of tuning elements 121 and a tuning switch 122 electrically connected to the plurality of tuning elements 121. The tuning switch 122 may be an SP4T (Single-Pole Four-Throw) switch. The tuning switch 122 can implement signal switching and adjustment, and flexibly adjust the working state of the antenna to adapt to different communication needs. By controlling the tuning switch 122, the tuning switch 122 switches different tuning elements 121 to be electrically connected between the feeding end 113 and the intrinsic antenna branch 111, so that at least an antenna operating in a first frequency range is formed between the feeding end and one end of the intrinsic antenna branch 111 close to the parasitic antenna branch 112, and the parasitic antenna branch 112 is formed into an antenna operating in a second frequency range; wherein the first frequency range is greater than the second frequency range. In the above scheme, the antenna module 1 is provided with an antenna structure 11 and a tuning circuit 12. The antenna structure 11 is provided with an intrinsic antenna branch 111, a parasitic antenna branch 112, a feed terminal 113, and a ground terminal 114. The intrinsic antenna branch 111 can be an IFA (Inverted-F antenna) antenna, which serves as the main radiator, and the parasitic antenna branch 112 serves as an auxiliary radiator. The tuning switch 122 switches between different tuning elements 121 and electrically connects the feed terminal 113 and the intrinsic antenna branch 111 to form antennas with different frequency bands. On the one hand, the area between the feed terminal and the end of the intrinsic antenna branch 111 near the parasitic antenna branch 112 forms an antenna operating in a first frequency range, and on the other hand, the parasitic antenna branch 112 forms an antenna operating in a second frequency range. In the above scheme, the first frequency range is set to be larger than the second frequency range, so that the parasitic antenna branch 112 forms an antenna with a frequency relatively lower than the first frequency range, and an antenna with a frequency relatively higher than the second frequency range is formed between the feeding end 113 and the end of the intrinsic antenna branch 111 close to the parasitic antenna branch 112. This can reduce the impact of the parasitic antenna branch 112 on the antenna performance in the high frequency range. On the basis of meeting domestic SAR regulations, it can reduce the antenna power reduction and avoid affecting the user experience.

[0041] Figure 2 Shown Figure 1 The circuit diagram of an embodiment of the tuning circuit 12 of the antenna module 1 is shown. Figure 1 and Figure 2As shown, the tuning element 121 includes a first tuning capacitor C1, a second tuning capacitor C2, a first tuning inductor L1, and a second tuning inductor L2. When the tuning switch 122 is switched to the first state, the first tuning capacitor C1 and the first tuning inductor L1 are connected in series between the intrinsic antenna branch 111 and the feeding end 113, the second tuning capacitor C2 is electrically connected between the first tuning capacitor C1 and the grounding end 114, and the second tuning inductor L2 is electrically connected between the intrinsic antenna branch 111 and the grounding end 114, so that an antenna A1 is formed between the feeding end 113 and the end of the intrinsic antenna branch 111 close to the parasitic antenna branch 112, which operates in a first frequency range. In this embodiment, the first frequency range can be a frequency range of an ultra-high frequency band, such as the N78 band (the operating frequency range of the N78 band is between 3.3 GHz and 3.8 GHz), etc., which is not limited in this application. In this embodiment, the ultra-high frequency band (N78 frequency band) is tuned to ALL OFF through the tuning switch 122, which means that all channels of the tuning switch 122 are closed, and no tuning element 121 is connected, and then the A1 mode of 1 / 4 wavelength from the feeding end 113 to the end is realized. Among them, the length of A1 between the feeding end and the end of the intrinsic antenna branch 111 close to the parasitic antenna branch 112 is at least 1 / 4 wavelength. This setting puts the antenna in a resonant state, can more effectively radiate electromagnetic waves, can improve the antenna's transmission efficiency, has better directivity, and can also match the antenna with the wavelength of a specific frequency band, thereby improving the efficiency and performance of signal transmission. Figure 2 In the embodiment shown, the first tuning capacitor C1 can adjust the impedance bandwidth, shorten the antenna, and improve energy propagation. The second tuning capacitor C2 is approximately conductive for high-frequency signals. When the intrinsic antenna branch 111 radiates high-frequency antenna signals, most of the current can return to the ground through the second tuning capacitor C2, and will not be coupled to the parasitic antenna branch 112 through the gap. The resonant mode of the parasitic antenna branch 112 mostly uses the resonant mode generated by itself, which is beneficial to improving radiation efficiency and reducing the impact of high-frequency signals radiated by the intrinsic antenna branch 111 on the parasitic antenna branch 112. The first tuning inductor L1 can improve the isolation between the intrinsic antenna branch 111 and the parasitic antenna branch 112. The second tuning inductor L2 can offset the impact of the second tuning capacitor C2, avoiding affecting the radiation efficiency of the intrinsic antenna branch 111.

[0042] Figure 3 Shown Figure 1 The circuit diagram of another embodiment of the tuning circuit 12 of the antenna module 1 is shown. Figure 1 and Figure 3As shown, the tuning element 121 includes a first tuning capacitor C1, a second tuning capacitor C2, a first tuning inductor L1, a second tuning inductor L2, and a third tuning inductor L3. When the tuning switch 122 is switched to the second state, the first tuning capacitor C1 and the first tuning inductor L1 are connected in series between the intrinsic antenna branch 111 and the feeding terminal 113, the second tuning capacitor C2 is electrically connected between the first tuning capacitor C1 and the ground terminal 114, the second tuning inductor L2 is electrically connected between the intrinsic antenna branch 111 and the ground terminal 114, and the third tuning inductor L3 is electrically connected between the first tuning capacitor C1 and the ground terminal 114, so that the parasitic antenna branch 112 forms an antenna operating in the second frequency range. The parasitic antenna branch 112 forms an antenna operating in a second frequency range, and the second frequency range is set to be smaller than the first frequency range. In this way, by adjusting the resonant mode of the parasitic branch, the radiation efficiency of the parasitic antenna branch 112 can be appropriately increased, and the influence of the parasitic antenna branch 112 on the antenna performance in the high frequency range can be reduced. On the basis of meeting domestic SAR regulations, the antenna power reduction can be reduced to avoid affecting the user experience. The second frequency range of this embodiment can be a frequency range of a high frequency band, for example, including the B41 band (the operating frequency range of the B41 band is between 2500MHz-2690MHz), etc., which is not limited in this application. In this embodiment, the high frequency band (B41 band) is tuned to the third tuning inductor L3 through the tuning switch 122, that is, the third tuning inductor L3 is connected between the feeding terminal 113 and the intrinsic antenna branch 111, and then realized through the 1 / 4 wavelength mode of the parasitic antenna branch 112. By adjusting the value of the third tuning inductor L3, the antenna's resonant frequency can be changed, ensuring impedance matching between the antenna and tuning switch 122. The length A2 of the parasitic antenna branch 112 is at least 1 / 4 wavelength. This configuration puts the antenna in a resonant state, enabling more efficient radiation of electromagnetic waves, improving the antenna's transmission efficiency and directionality. It also allows the antenna to match the wavelength of a specific frequency band, enhancing signal transmission efficiency and performance.

[0043] In some embodiments, the tuning switch 122 switches different tuning elements 121 to be electrically connected between the feed end 113 and the intrinsic antenna branch 111, and also causes the intrinsic antenna branch 111 to form at least one antenna operating in a third frequency range; the third frequency range is smaller than the second frequency range. The third frequency range of this embodiment can be a frequency range of a low frequency band. By controlling the tuning switch 122 to switch different tuning elements to be electrically connected between the feed end 113 and the intrinsic antenna branch 111, the intrinsic antenna branch 111 is also formed into different antennas operating in a frequency range of a low frequency band, thereby expanding the scope of use. In this embodiment, the intermediate frequency band (for example, including the B1 band, the B3 band, and the B40 band) is tuned to ALL OFF, the fourth tuning inductor L4, the fifth tuning inductor L5, and the sixth tuning inductor L6 respectively through the tuning switch 122, all of which are respectively realized by 1 / 4 wavelength of the intrinsic antenna branch of the IFA antenna. By configuring tuning inductors of different values, antennas with different resonant frequencies can be realized.

[0044] Figure 4 Shown Figure 1 The circuit diagram of another embodiment of the tuning circuit 12 of the antenna module 1 is shown. Figure 1 and Figure 4 As shown, the tuning element 121 includes a first tuning capacitor C1, a second tuning capacitor C2, a first tuning inductor L1 and a second tuning inductor L2. When the tuning switch 122 is switched to the third state, the first tuning capacitor C1 and the first tuning inductor L1 are connected in series between the intrinsic antenna branch 111 and the feeding end 113, and the second tuning capacitor C2 is electrically connected between the first tuning capacitor C1 and the ground end 114, so that the intrinsic antenna branch 111 forms a first antenna operating in a third frequency range. In this embodiment, the intrinsic antenna branch 111 forms a first antenna operating in a third frequency range. The third frequency range can be a frequency range of a low frequency band, for example, the operating frequency of the first antenna includes the B1 band (the operating frequency range of the B1 band is around 2100 MHz), etc., which is not limited in this application. In this embodiment, the mid-frequency band (B1 band) is tuned to ALL OFF via the tuning switch 122, meaning that all channels of the tuning switch 122 are closed, and no tuning element 121 is connected, and then the 1 / 4 wavelength of the intrinsic antenna branch of the IFA antenna is achieved. The length A3 of the intrinsic antenna branch 111 is at least 1 / 4 wavelength. With this arrangement, the length A3 of the first antenna formed is at least 1 / 4 wavelength, placing the formed first antenna in a resonant state, enabling more efficient radiation of electromagnetic waves, improving the antenna's transmission efficiency, and providing better directivity. This allows the antenna to match the wavelength of a specific frequency band, thereby improving the efficiency and performance of signal transmission.

[0045] Figure 5 Shown Figure 1A circuit diagram of another embodiment of a tuning circuit of an antenna module is shown. Figure 1 and Figure 5 As shown, the tuning element 121 includes a first tuning capacitor C1, a second tuning capacitor C2, a first tuning inductor L1, a second tuning inductor L2, and a fourth tuning inductor L4. When the tuning switch 122 is switched to the fourth state, the first tuning capacitor C1 and the first tuning inductor L1 are connected in series between the intrinsic antenna branch 111 and the feeding terminal 113, the second tuning capacitor C2 is electrically connected between the first tuning capacitor C1 and the ground terminal 114, the second tuning inductor L2 is electrically connected between the intrinsic antenna branch 111 and the ground terminal 114, and the fourth tuning inductor L4 is electrically connected between the intrinsic antenna branch 111 and the ground terminal 114, so that the intrinsic antenna branch 111 forms a second antenna operating in a third frequency range, the frequency range of the second antenna being smaller than the frequency range of the first antenna. In this embodiment, the intrinsic antenna branch 111 forms a second antenna operating in the third frequency range. The third frequency range can be a frequency range of a low frequency band, for example, the operating frequency of the second antenna includes the B3 band (the operating frequency range of the B3 band is around 1800MHz), etc., which is not limited in this application. In this embodiment, the mid-frequency band (B3 band) is tuned to the fourth tuning inductor L4 through the tuning switch 122, which means that the fourth tuning inductor L4 is connected between the intrinsic antenna branch 111 and the feeding end 113, and then realized by the 1 / 4 wavelength of the intrinsic antenna branch of the IFA antenna. By adjusting the value of the fourth tuning inductor L4, the resonant frequency of the antenna can be changed, and the impedance matching between the antenna and the tuning switch 122 can also be ensured. The length A3 of the formed second antenna is at least 1 / 4 wavelength, so that the formed second antenna is in a resonant state, can radiate electromagnetic waves more effectively, can improve the transmission efficiency of the antenna, has good directivity, can match the antenna with the wavelength of a specific frequency band, and improve the efficiency and performance of signal transmission.

[0046] Figure 6 Shown Figure 1 The circuit diagram of another embodiment of the tuning circuit of the antenna module shown in FIG. Figure 1 and Figure 6As shown, the tuning element 121 includes a first tuning capacitor C1, a second tuning capacitor C2, a first tuning inductor L1, a second tuning inductor L2, a fifth tuning inductor L5, and a sixth tuning inductor L6. When the tuning switch 122 is switched to the fourth state, the first tuning capacitor C1 and the first tuning inductor L1 are connected in series between the intrinsic antenna branch 111 and the feeding terminal 113, the second tuning capacitor C2 is electrically connected between the first tuning capacitor C1 and the ground terminal 114, the second tuning inductor L2 is electrically connected between the intrinsic antenna branch 111 and the ground terminal 114, the fifth tuning inductor L5 is electrically connected between the intrinsic antenna branch 111 and the ground terminal 114, and the sixth tuning inductor L6 is electrically connected between the first tuning capacitor C1 and the ground terminal 114, so that the intrinsic antenna branch 111 generates a third signal operating in a third frequency range, and the frequency range of the third signal is greater than the frequency range of the first antenna. In this embodiment, the intrinsic antenna branch 111 forms a third antenna operating in a third frequency range. The third frequency range can be a frequency range of a low frequency band. For example, the operating frequency of the third antenna includes the B40 band (the operating frequency range of the B40 band is around 2300MHz-2400MHz), etc., which is not limited in this application. In this embodiment, the mid-frequency band (B40 band) is tuned to the fifth tuning inductor L5 and the sixth tuning inductor L6 through the tuning switch 122, which means that the fifth tuning inductor L5 and the sixth tuning inductor L6 are connected between the intrinsic antenna branch 111 and the feeding end 113, and then realized by 1 / 4 wavelength of the intrinsic antenna branch of the IFA antenna. By adjusting the values ​​of the fifth tuning inductor L5 and the sixth tuning inductor L6, the resonant frequency of the antenna can be changed, and the impedance matching between the antenna and the tuning switch 122 can also be ensured. The length A3 of the third antenna formed is at least 1 / 4 wavelength, so that the third antenna formed is in a resonant state, can radiate electromagnetic waves more effectively, improve the antenna's transmission efficiency, have better directionality, and can match the antenna with the wavelength of a specific frequency band, thereby improving the efficiency and performance of signal transmission.

[0047] Figure 7 FIG. 1 is a schematic diagram showing the structure of an embodiment of a terminal device of the present application. Figure 7 As shown, the terminal device 2 can be a mobile phone, tablet or other device. The terminal device 2 includes the above Figures 1 to 6 The antenna module 1 shown in the embodiment. The terminal device 2 is configured as above Figures 1 to 6 The antenna module 1 shown in the embodiment can reduce the antenna power reduction while meeting domestic SAR regulations, thereby avoiding affecting user experience.

[0048] Figure 8 Shown Figure 7 The enlarged view of the metal frame of the terminal device at point B is shown. Figure 7 and Figure 8As shown, the terminal device 2 includes a metal frame 21, which includes a first metal frame 211 and a second metal frame 212. The first metal frame 211 and the second metal frame 212 are separated by a gap 215. Part of the first metal frame 211 serves as an intrinsic antenna branch 111, and part of the second metal frame 212 serves as a parasitic antenna branch 112. In this embodiment, the first metal frame 211 serves as the intrinsic antenna branch 111, and the second metal frame 212 serves as the parasitic antenna branch 112, thereby forming antennas with different frequency ranges. The size of the gap 215 should not be too large or too small. If the size of the gap 215 is too large, it will not look good as the frame of the terminal device. If the size of the gap 215 is too small, the antenna radiation performance will be poor. By appropriately sizing the gap 215 between the first metal frame 211 and the second metal frame 212, the terminal device's external appearance can be ensured without affecting the antenna radiation performance.

[0049] exist Figure 8 In the embodiment shown, at least one first groove 213 is provided on the inner side of the first metal frame 211. In this embodiment, more than one first groove 213 is provided on the inner side of the first metal frame 211. The first groove 213 can be provided as a current dispersion path for the intrinsic antenna branch 111, thereby optimizing the transmission and distribution of the current, dispersing and regulating the current, and optimizing the performance and efficiency of the antenna. Figure 8 In the illustrated embodiment, at least one second groove 214 is provided on the inner side of the second metal frame 212. In this embodiment, more than one second groove 214 is provided on the inner side of the second metal frame 212. By providing the second groove 214, it can serve as a current dispersion path for the parasitic antenna branch 112, thereby optimizing the transmission and distribution of the current, dispersing and regulating the current, and optimizing the performance and efficiency of the antenna. In this manner, by digging grooves on the inner side walls of the first metal frame 211 and the second metal frame 212, the current can be guided to different paths through the grooves to achieve current dispersion and regulation, thereby optimizing the performance and efficiency of the antenna.

[0050] exist Figure 8 In the embodiment shown, multiple tuning elements 121 and tuning switches 122 are integrated into the same circuit board 22. This has high integration, few components, and a compact structure. Figure 8 In the embodiment shown, a clearance area 23 is provided between the circuit board 22 and the first metal frame 211. By providing the clearance area 23 between the edge of the circuit board 22 and the inner edge of the first metal frame 211, a clearance is provided between the tuning circuit 12 and the first metal frame 211, thereby preventing the concentrated current at the end of the circuit board 22 from coupling with the first metal frame 211, reducing electromagnetic interference and signal coupling, and improving the quality and stability of signal transmission. Figure 8 In the illustrated embodiment, a clearance area 23 is provided between the circuit board 22 and the second metal frame 212. By providing a clearance area between the edge of the circuit board 22 and the inner edge of the second metal frame 212, a clearance is created between the tuning circuit 12 and the second metal frame 212. This prevents concentrated current at the ends of the circuit board 22 from coupling with the second metal frame 212, reducing electromagnetic interference and signal coupling, and improving the quality and stability of signal transmission. This arrangement clears the area surrounding the tuning circuit 12, reducing electromagnetic interference and signal coupling, enhancing the performance, flexibility, and stability of the antenna, and thereby improving the signal transmission quality and user experience of the communication device.

[0051] Combine Figures 1 to 8 In the embodiment shown, the UHF band antenna, for example, includes an N78 band antenna. Figure 8 A1 in the figure indicates that the A1 mode of 1 / 4 wavelength from the feeding end 113 to the end is realized. The high frequency band antenna, for example, the B41 band antenna can be realized by Figure 8 A2 in the figure indicates that the 1 / 4 wavelength mode of the parasitic antenna branch 112 is used. The antennas in the mid-frequency band include, for example, the B1 band, the B3 band, and the B40 band. Figure 8 A3 in the figure indicates that it is achieved by 1 / 4 wavelength of the intrinsic antenna branch of the IFA antenna. The arrows shown above can be the direction of current flow of the corresponding antenna. This embodiment changes the current pattern by changing the current pattern of the high-frequency band antenna and the N78 band antenna. The current on the radiated parasitic antenna branch 112 is dispersed, and the current distribution at the board end of the circuit board 22 is strong, so as to achieve both antenna performance and low SAR. Taking the domestic SAR regulatory restrictions as an example, the power reduction of the MHB (Main Antenna Hub) is reduced, and the mid-high frequency power reduction is 1.5 to 2 dB, and the N78 band power reduction is 3 dB, which is 50% lower than the traditional SAR, and the degree of antenna power reduction is also reduced.

[0052] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An antenna module, characterized in that: include: The antenna structure includes an intrinsic antenna branch, a parasitic antenna branch, a feeding terminal, and a ground terminal; the intrinsic antenna branch and the parasitic antenna branch are arranged at intervals by a slit; and A tuning circuit is electrically connected between the intrinsic antenna branch and the feeding end, and is electrically connected to the ground end; the tuning circuit includes a plurality of tuning elements and a tuning switch electrically connected to the plurality of tuning elements; the tuning switch switches different tuning elements to be electrically connected between the feeding end and the intrinsic antenna branch, so that at least an antenna operating in a first frequency range is formed from the feeding end to the end of the intrinsic antenna branch close to the parasitic antenna branch, and the parasitic antenna branch is formed into an antenna operating in a second frequency range; wherein the first frequency range is greater than the second frequency range.

2. The antenna module according to claim 1, wherein: The tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, and a second tuning inductor. When the tuning switch is switched to a first state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, and the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, so that an antenna operating in the first frequency range is formed between the feeding end and the end of the intrinsic antenna branch close to the parasitic antenna branch.

3. The antenna module according to claim 1, wherein: The tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, a second tuning inductor and a third tuning inductor; when the tuning switch is switched to the second state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, and the third tuning inductor is electrically connected between the first tuning capacitor and the ground end, so that the parasitic antenna branch forms an antenna operating in the second frequency range.

4. The antenna module according to claim 1, wherein: The tuning switch switches the different tuning elements to be electrically connected between the feeding end and the intrinsic antenna branch, and also enables the intrinsic antenna branch to form at least one antenna operating in a third frequency range; the third frequency range is smaller than the second frequency range.

5. The antenna module according to claim 4, wherein: The tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, and a second tuning inductor; when the tuning switch is switched to a third state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, and the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, so that the intrinsic antenna branch forms a first antenna operating in the third frequency range.

6. The antenna module according to claim 4, characterized in that: The tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, a second tuning inductor and a fourth tuning inductor; when the tuning switch is switched to the fourth state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, and the fourth tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, so that the intrinsic antenna branch forms a second antenna operating in the third frequency range, and the frequency range of the second antenna is smaller than the frequency range of the first antenna.

7. The antenna module according to claim 4, wherein: The tuning element includes a first tuning capacitor, a second tuning capacitor, a first tuning inductor, a second tuning inductor, a fifth tuning inductor and a sixth tuning inductor; when the tuning switch is switched to the fourth state, the first tuning capacitor and the first tuning inductor are connected in series between the intrinsic antenna branch and the feeding end, the second tuning capacitor is electrically connected between the first tuning capacitor and the ground end, the second tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, the fifth tuning inductor is electrically connected between the intrinsic antenna branch and the ground end, and the sixth tuning inductor is electrically connected between the first tuning capacitor and the ground end, so that the intrinsic antenna branch forms a third signal operating in the third frequency range, and the frequency range of the third signal is greater than the frequency range of the first antenna.

8. The antenna module according to claim 1, wherein: The length from the feeding end to the end of the intrinsic antenna branch close to the parasitic antenna branch is at least 1 / 4 wavelength; and / or The length of the intrinsic antenna branch is at least 1 / 4 wavelength; and / or The length of the parasitic antenna branch is at least 1 / 4 wavelength.

9. A terminal device, characterized in that: include: The antenna module according to any one of claims 1 to 8.

10. The terminal device according to claim 9, characterized in that The terminal device includes a metal frame, the metal frame including a first metal frame and a second metal frame, the first metal frame and the second metal frame are separated by a gap; wherein a portion of the first metal frame serves as the intrinsic antenna branch, and a portion of the second metal frame serves as the parasitic antenna branch; At least one first groove is provided on the inner side of the first metal frame; and / or At least one second groove is provided on the inner side of the second metal frame.

11. The terminal device according to claim 10, characterized in that The plurality of tuning elements and the tuning switch are integrated into the same circuit board; A clearance area is provided between the circuit board and the first metal frame; and / or A clearance area is provided between the circuit board and the second metal frame.

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