Miniaturized multi-band antenna and external terminal equipment

Abstract

The invention provides a miniaturized multi-band antenna and external terminal equipment. The miniaturized multi-band antenna comprises a first radiation part and a second radiation part, a plurality of first bending parts are formed on the first radiation part and are arranged at intervals, so that the first radiation part is of a curve structure and is used for radiating low-band signals, and the second radiation part is of a symmetrical structure and is used for radiating low-band signals. The second radiation part is used for radiating a medium-frequency-band signal and a high-frequency-band signal, and a first avoidance gap is formed between the first radiation part and the second radiation part. The miniaturized multi-band antenna not only can effectively improve the use stability and the use experience of a user, but also can effectively reduce the production difficulty of the miniaturized multi-band antenna.

Description

Technical Field

[0001] This disclosure relates to the technical field of miniaturized multi-band antennas, and in particular to a miniaturized multi-band antenna and an external terminal device. Background Technology

[0002] With the rapid evolution of 5G communication technology, the market has placed higher demands on the comprehensive performance of 5G antennas, especially in the significant technical contradiction between expanding the operating frequency band and miniaturizing the equipment: In order to achieve a wider operating bandwidth, traditional designs often need to increase the antenna size, but in application scenarios such as smart terminals and IoT modules, PCB layout space is strictly limited, making it difficult to adapt large-size antennas; at the same time, a larger antenna size will also lead to increased production costs and affect the integrated design of the terminal product.

[0003] To address the aforementioned issues, some manufacturers have conducted further research and development. For example, existing patent CN117254248A proposes a full-band antenna, which includes a first radiating antenna, a second radiating antenna, a third radiating antenna, a feed point, and a ground point. The feed point is electrically connected to the first radiating antenna, and the second and third radiating antennas are both electrically connected to the ground point. The first, second, and third radiating antennas are symmetrically arranged, and the feed point and ground point are both located on the axis of symmetry. This full-band antenna not only simplifies the antenna structure but also broadens the antenna's radiation frequency band. Compared to existing technologies, it increases the antenna ground area and uses a symmetrical coupling method for setup and connection. The antenna setup is simple, requiring no additional matching circuits or tuning switches, thus achieving the goal of maintaining overall ultra-low frequency performance while achieving full-band coverage.

[0004] However, the full-band antennas in the aforementioned technologies have significant drawbacks: First, when the first radiating antenna uses symmetrical coupling to broaden the frequency band, intermodulation interference is easily generated between different branches, causing energy to be lost back and forth during the coupling process. This results in low radiation efficiency of individual frequency bands in the low-frequency band of the full-band antenna, and the signal may also be mixed with clutter, making the signal output of the first radiating antenna less stable. This not only greatly reduces the stability of the full-band antenna but also significantly reduces the user experience. Second, the symmetrical coupling structure places extremely high demands on the dimensional consistency of the left and right branches of the first radiating antenna (length and width allowable error ≤ 0.1mm). Once this error range is exceeded, it will lead to an imbalance in the antenna electric field distribution and failure of the coupling effect, thereby affecting the full-band coverage performance and greatly increasing the production difficulty of the full-band antenna. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a miniaturized multi-band antenna and external terminal device that can not only effectively improve the stability of use and the user experience, but also effectively reduce the difficulty of production.

[0006] The purpose of this disclosure is achieved through the following technical solution: A miniaturized multi-band antenna includes a first radiating element and a second radiating element. The first radiating element has a plurality of first bends, which are spaced apart from each other to make the first radiating element have a curved structure. The first radiating element is used to radiate low-frequency signals. The second radiating element has a symmetrical structure and is used to radiate mid-frequency signals and high-frequency signals. A first clearance gap is formed between the first radiating element and the second radiating element.

[0007] In one embodiment, the first radiating element includes a first antenna stub, a second antenna stub, and a third antenna stub connected in sequence. The width of the first antenna stub is greater than the width of the second antenna stub, and the width of the third antenna stub is greater than the width of the second antenna stub. A plurality of first bends are formed on the second antenna stub to make the second antenna stub have a curved structure.

[0008] In one embodiment, the first antenna stub has a rectangular structure, and the third antenna stub has a feed pad welded to and electrically connected to the end away from the second antenna stub.

[0009] In one embodiment, the miniaturized multi-band antenna further includes a grounding pad that is soldered to and electrically connected to the axis of symmetry of the second radiating element.

[0010] In one embodiment, the second radiating element includes a fourth antenna stub, a fifth antenna stub, and a sixth antenna stub connected in sequence. The fourth antenna stub, the fifth antenna stub, and the sixth antenna stub are all symmetrical structures. The grounding pad is welded and electrically connected to the axis of symmetry of the fourth antenna stub. The first clearance gap is formed between the fourth antenna stub and the first radiating element.

[0011] In one embodiment, a second bend is formed at the connection between the fourth antenna stub and the fifth antenna stub, and at the connection between the fifth antenna stub and the sixth antenna stub.

[0012] In one embodiment, the symmetrical ends of the fifth antenna stub are each provided with a clearance groove on one side adjacent to the fourth antenna stub.

[0013] In one embodiment, the miniaturized multi-band antenna further includes an antenna dielectric substrate, wherein the first radiating element and the second radiating element are both printed on the first mounting surface of the antenna dielectric substrate.

[0014] In one embodiment, the miniaturized multi-band antenna further includes a metal ground plane, which is mounted on a second mounting surface of the antenna dielectric substrate.

[0015] In one embodiment, the frequency of the low-frequency signal is 0.6 GHz to 0.96 GHz.

[0016] In one embodiment, the frequency of the mid-band signal is 1.4 GHz to 2.7 GHz.

[0017] In one embodiment, the frequency of the high-frequency signal is 3.3 GHz to 5 GHz.

[0018] In one embodiment, a hollow area is formed at one end of the first antenna stub adjacent to the second antenna stub.

[0019] In one embodiment, the inner walls of both of the two recessed slots are provided with a seventh antenna stub, the two seventh antenna stubs are symmetrically arranged, the connecting part of the seventh antenna stub is fixedly connected to the fifth antenna stub, the length direction of the signal transmitting part of the seventh antenna stub is parallel to the length direction of the fourth antenna stub, and the two sides of the signal transmitting part of the seventh antenna stub are respectively spaced apart from the fourth antenna stub and the fifth antenna stub.

[0020] An external terminal device includes the miniaturized multi-band antenna described in any of the above embodiments.

[0021] Compared with the prior art, this disclosure has at least the following advantages: 1. The aforementioned miniaturized multi-band antenna, due to the presence of multiple first bends on the first radiating element, with these bends spaced apart to create a curved structure, allows the first radiating element to radiate low-frequency signals. This curved structure significantly extends the current propagation path length within a limited space, reducing the resonant frequency of the first radiating element and enabling it to radiate low-frequency signals. Furthermore, the curved structure improves space utilization and optimizes the assembly volume of the first radiating element. Compared to the full-band antennas in the aforementioned related technologies that achieve low-frequency radiation through symmetrical coupling, this design offers a significant advantage. The curved structure design of the first radiating element of the miniaturized multi-band antenna disclosed herein not only reduces energy consumption but also improves the radiation efficiency of a single frequency band in the low-frequency band and reduces interference from clutter in the signal. This makes the low-frequency signal radiated by the miniaturized multi-band antenna more stable, thereby greatly improving the stability of the miniaturized multi-band antenna and the user experience. At the same time, compared with the first radiating antenna of the full-band antenna in the above-mentioned related technologies, the first radiating element of this disclosure does not need to meet the dimensional accuracy requirements of symmetrical coupling to achieve the radiation of low-frequency signals, effectively reducing its own manufacturing difficulty, and thus greatly reducing the manufacturing difficulty of the miniaturized multi-band antenna.

[0022] 2. Because the second radiating element has a symmetrical structure, it is used to radiate mid-frequency and high-frequency signals, so that the second radiating element can broaden its own radiation frequency band through symmetrical coupling, enabling the second radiating element to stably radiate mid-frequency and high-frequency signals; a first clearance gap is formed between the first and second radiating elements to form a physical separation between them, reducing the interference between low-frequency and mid-to-high-frequency signals, so that the miniaturized multi-band antenna can stably radiate low-frequency and mid-to-high-frequency signals, thereby greatly improving the operational stability of the miniaturized multi-band antenna. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a miniaturized multi-band antenna according to one embodiment; Figure 2 for Figure 1 A partially enlarged schematic diagram of the miniaturized multi-band antenna shown; Figure 3 for Figure 1 Another perspective schematic diagram of the miniaturized multi-band antenna shown; Figure 4 Simulation S11 curve for miniaturized multi-band antenna; Figure 5 Simulated VSWR curves for miniaturized multi-band antennas; Figure 6 Surface current distribution diagram of a miniaturized multi-band antenna (0.6 GHz); Figure 7 Another surface current distribution diagram (0.96 GHz) for a miniaturized multi-band antenna; Figure 8 A schematic diagram of the radiation of a miniaturized multi-band antenna (0.96 GHz); Figure 9 Another radiation diagram (1.4 GHz) of a miniaturized multi-band antenna; Figure 10 Another radiation diagram (1.7 GHz) for a miniaturized multi-band antenna. Figure 11 This is another radiation diagram (3.3 GHz) of a miniaturized multi-band antenna.

[0025] Reference numerals in the figures: Miniaturized multi-band antenna 10; First radiator 100; First bend 110; First antenna segment 120; Hollowed-out area 121; Second antenna segment 130; First curved segment 131; Second curved segment 132; Third antenna segment 140; Extended flange 141; Feed pad 150; Second radiator 200; Isolation gap 210; Fourth antenna segment 220; Fifth antenna segment 230; Recessed slot 231; Sixth antenna segment 240; Second bend 250; Seventh antenna segment 260; Connecting part 261; Signal transmitting part 262; First recessed gap 300; Second recessed gap 400; Third recessed gap 500; Grounding pad 600; Antenna dielectric substrate 700; First mounting surface 710; Second mounting surface 720; Metal ground 800. Detailed Implementation

[0026] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] 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 disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments: like Figures 1 to 11 As shown, a miniaturized multi-band antenna 10 includes a first radiator 100 and a second radiator 200. The first radiator 100 has multiple first bends 110 formed thereon, which are spaced apart to give the first radiator 100 a curved structure. The first radiator 100 radiates low-frequency signals, allowing it to significantly extend the current propagation path length within a limited space through its curved structure, thereby reducing its resonant frequency and enabling it to radiate low-frequency signals. Furthermore, the curved structure improves space utilization and optimizes the assembly volume of the first radiator 100. Compared to the full-band antennas in the aforementioned related technologies, this first radiating antenna broadens the bandwidth through symmetrical coupling. The curved structure design of the first radiating element 100 of the miniaturized multi-band antenna 10 disclosed herein not only reduces energy consumption but also improves the radiation efficiency of a single frequency band in the low-frequency band and reduces interference from clutter in the signal. This makes the low-frequency signal radiated by the miniaturized multi-band antenna 10 more stable, thereby greatly improving the stability of the miniaturized multi-band antenna 10 and the user experience. At the same time, compared with the first radiating antenna of the full-band antenna in the above-mentioned related technologies, the first radiating element 100 of this disclosure can achieve low-frequency signal radiation without meeting the dimensional accuracy requirements of symmetrical coupling, effectively reducing its own manufacturing difficulty and thus greatly reducing the manufacturing difficulty of the miniaturized multi-band antenna 10.

[0030] like Figure 1As shown, the second radiator 200 has a symmetrical structure and is used to radiate mid-frequency and high-frequency signals. This allows the second radiator 200 to broaden its radiated frequency band through symmetrical coupling, enabling it to stably radiate mid-frequency and high-frequency signals. A first clearance gap 300 is formed between the first radiator 100 and the second radiator 200 to create a physical separation between them, reducing interference between low-frequency and mid-to-high-frequency signals. This allows the miniaturized multi-band antenna 10 to stably radiate low-frequency and mid-to-high-frequency signals, thereby greatly improving the operational stability of the miniaturized multi-band antenna 10.

[0031] The aforementioned miniaturized multi-band antenna 10, due to the presence of multiple first bends 110 on the first radiating element 100, with these bends spaced apart, gives the first radiating element 100 a curved structure. The first radiating element 100 radiates low-frequency signals, allowing it to significantly extend the current propagation path length within a limited space through its curved structure, thereby reducing its resonant frequency and enabling it to radiate low-frequency signals. Furthermore, the curved structure improves space utilization and optimizes the assembly volume of the first radiating element 100. Compared to the full-band antennas in the aforementioned related technologies, this first radiating antenna achieves low-frequency radiation by widening the radiation band through symmetrical coupling. The curved structure design of the first radiating element 100 of the miniaturized multi-band antenna 10 disclosed herein not only reduces energy consumption but also improves the radiation efficiency of a single frequency band in the low-frequency band and reduces interference from clutter in the signal. This makes the low-frequency signal radiated by the miniaturized multi-band antenna 10 more stable, thereby greatly improving the stability of the miniaturized multi-band antenna 10 and the user experience. At the same time, compared with the first radiating antenna of the full-band antenna in the above-mentioned related technologies, the first radiating element 100 of this disclosure can achieve low-frequency signal radiation without meeting the dimensional accuracy requirements of symmetrical coupling, effectively reducing its own manufacturing difficulty and thus greatly reducing the manufacturing difficulty of the miniaturized multi-band antenna 10.

[0032] Furthermore, since the second radiating element 200 has a symmetrical structure, it is used to radiate mid-frequency and high-frequency signals, so that the second radiating element 200 can broaden its own radiation frequency band signal through symmetrical coupling, enabling the second radiating element 200 to stably radiate mid-frequency and high-frequency signals. A first clearance gap 300 is formed between the first radiating element 100 and the second radiating element 200, so that a physical distance is formed between the first radiating element 100 and the second radiating element 200, reducing the interference between low-frequency signals and mid-to-high-frequency signals, so that the miniaturized multi-band antenna 10 can stably radiate low-frequency and mid-to-high-frequency signals, thereby greatly improving the operational stability of the miniaturized multi-band antenna 10.

[0033] like Figures 1 to 2 As shown, in one embodiment, the first radiator 100 includes a first antenna stub 120, a second antenna stub 130, and a third antenna stub 140 connected in sequence. The width of the first antenna stub 120 is greater than the width of the second antenna stub 130, and the width of the third antenna stub 140 is greater than the width of the second antenna stub 130. A plurality of first bends 110 are formed on the second antenna stub 130 to make the second antenna stub 130 have a curved structure, so that the first radiator 100 can be extended through the curved structure of the second antenna stub 130. The current flow path reduces the resonant frequency of the first radiator 100 to match the output of the low-frequency signal of the first radiator 100. At the same time, the first radiator 100 also forms a "wide-narrow-wide" multi-section impedance transformation network through the first antenna stub 120, the second antenna stub 130 and the third antenna stub 140. This not only effectively widens the signal radiation frequency band of the first radiator 100, but also effectively improves the stability of the low-frequency signal of the miniaturized multi-band antenna 10 by optimizing impedance matching and reducing energy reflection and clutter interference.

[0034] like Figures 1 to 2 As shown, in one embodiment, the first antenna stub 120 has a rectangular structure, and the end of the third antenna stub 140 away from the second antenna stub 130 is welded and electrically connected to a feed pad 150, so that the width of the first antenna stub 120 is uniform, reducing the skin effect loss during current transmission, reducing the attenuation of energy during the conduction process of the first antenna stub 120, providing a stable and sufficient energy supply for the low-frequency resonance of the second antenna stub 130, thereby greatly improving the operational stability of the miniaturized multi-band antenna 10.

[0035] It is understandable that the second antenna stub 130 extends its length through a curved structure, but this also makes it difficult for the characteristic impedance of the second antenna stub 130 to be precisely matched with the impedance characteristics of the adjacent antenna stubs and the feed pad 150 due to the increased length. This results in impedance mismatch in the first radiating element 100, which in turn greatly reduces the stability of the miniaturized multi-band antenna 10.

[0036] like Figures 1 to 2 As shown, in one embodiment, the second antenna stub 130 includes a first curved stub portion 131 and a second curved stub portion 132. The two ends of the first curved stub portion 131 are fixed to and electrically connected to the first antenna stub 120 and the second curved stub portion 132, respectively. The end of the second curved stub portion 132 away from the first curved stub portion 131 is fixed to and electrically connected to the third antenna stub 140. The width of the first curved stub portion 131 is smaller than that of the second curved stub portion 132, so that the second antenna stub 130 can utilize the negative correlation between characteristic impedance and antenna stub width to construct a stepped impedance path through a "narrow-wide" gradually changing width to match the impedance requirements of different frequency bands in low-frequency signals. This effectively optimizes the impedance matching of the second antenna stub 130, thereby greatly improving the operational stability of the miniaturized multi-band antenna 10.

[0037] like Figures 1 to 2 As shown, in one embodiment, the first curved branch 131 and the second curved branch 132 are integrally formed to improve the structural compactness of the second antenna branch 130.

[0038] like Figures 1 to 2 As shown, in one embodiment, the width of the first curve stub 131 is less than half the width of the second curve stub 132, so as to increase the impedance gradient between the first curve stub 131 and the second curve stub 132, effectively improving the steepness of the stepped impedance path, thereby widening the radiation frequency band of the first radiator 100.

[0039] like Figures 1 to 2 As shown, in one embodiment, the width of the first curved branch 131 is 0.35mm to 0.45mm, and the width of the second curved branch 132 is 0.9mm to 1mm.

[0040] like Figures 1 to 2 As shown, in one embodiment, the middle section of the third antenna stub 140 is provided with extended flanges 141 on both sides to increase the width of the middle section of the third antenna stub 140, so that the impedance matching of the third antenna stub 140 can be optimized by utilizing the negative correlation between characteristic impedance and antenna stub width, thereby further improving the stability of the miniaturized multi-band antenna 10.

[0041] like Figures 1 to 2 As shown, in one embodiment, the miniaturized multi-band antenna 10 further includes a grounding pad 600, which is soldered and electrically connected to the axis of symmetry of the second radiator 200. This allows the second radiator 200 to form a low-impedance grounding loop through the grounding pad 600, quickly dissipating the induced current generated during operation and reducing parasitic capacitance and inductance caused by charge accumulation. This effectively reduces the energy loss and signal interference of the miniaturized multi-band antenna 10. Furthermore, the grounding pad 600 can also act as a battery shielding layer to shield stray electromagnetic signals from the external environment from interfering with the mid-to-high frequency signals of the second radiator 200. It can also block the crosstalk path of the low-frequency signal of the first radiator 100 to the second radiator 200 through spatial coupling, greatly reducing the cross-coupling coefficient between the low-frequency and mid-to-high frequency bands. This improves the overall signal purity of the miniaturized multi-band antenna 10 and significantly enhances its operational stability.

[0042] It should be noted that the specific principle by which the second radiating element 200 can broaden its own radiation frequency band signal through symmetrical coupling is existing technology and will not be elaborated here.

[0043] like Figures 1 to 2 As shown, in one embodiment, an isolation gap 210 is formed at the axis of symmetry of the second radiator 200 to separate the structures on both sides of the second radiator 200, preventing the electric fields on both sides of the second radiator 200 from overlapping and canceling each other out in the region of the axis of symmetry, and preventing the symmetrical electric field distribution of the second radiator 200 from shifting. This not only effectively improves the focusing degree of the electric field energy of the second radiator 200 and enhances the radiation intensity of mid-frequency and high-frequency signals, but also effectively broadens the radiation frequency band of the second radiator 200. At the same time, it significantly reduces the parasitic coupling interference inside the second radiator 200 and the influence of the external electromagnetic environment on its performance, thereby greatly improving the transmission stability of mid-frequency and high-frequency signals of the miniaturized multi-band antenna 10.

[0044] like Figures 1 to 2 As shown, in one embodiment, the second antenna stub 130 and the third antenna stub 140 are disposed within the isolation gap 210. There is a first clearance gap 300 between the second radiator 200 and the second antenna stub 130 and the third antenna stub 140, so as to make full use of the space of the isolation gap 210, optimize the overall volume of the miniaturized multi-band antenna 10, and at the same time, the first clearance gap 300 can block the parasitic coupling between the second radiator 200 and the second antenna stub 130 and the third antenna stub 140, reduce the signal interference between the first radiator 100 and the second radiator 200, and thus greatly improve the operational stability of the miniaturized multi-band antenna 10.

[0045] like Figures 1 to 2 As shown, in one embodiment, the second radiator 200 includes a fourth antenna stub 220, a fifth antenna stub 230, and a sixth antenna stub 240 connected in sequence. The fourth antenna stub 220, the fifth antenna stub 230, and the sixth antenna stub 240 are all symmetrical structures. A grounding pad 600 is soldered and electrically connected to the axis of symmetry of the fourth antenna stub 220. A first clearance gap 300 is formed between the fourth antenna stub 220 and the first radiator 100, so that the fourth antenna stub 220, the fifth antenna stub 230, and the sixth antenna stub 240 can broaden their own radiation frequency band signal through symmetrical coupling, so that the second radiator 200 can radiate mid-frequency signals.

[0046] like Figures 1 to 2 As shown, in one embodiment, an isolation gap 210 is formed at the axis of symmetry of the fourth antenna stub 220 to separate the structures on both sides of the fourth antenna stub 220 and prevent the electric fields on both sides from overlapping and canceling each other out; a first clearance gap 300 is formed between the fourth antenna stub 220 and the second antenna stub 130 and the third antenna stub 140 to block the parasitic coupling between the fourth antenna stub 220 and the second antenna stub 130 and the third antenna stub 140, reduce the signal interference between the first radiating element 100 and the second radiating element 200, and thus improve the stability of the miniaturized multi-band antenna 10.

[0047] It is understandable that if the distance between the fourth antenna stub 220 and the second antenna stub 130 and the third antenna stub 140 is too close, it is very easy to cause mutual interference and near-field coupling between low-frequency band signals and mid-to-high frequency band signals, resulting in the mid-to-high frequency band resonant frequency deviating from the preset target value. Ultimately, this leads to a decrease in the full-band radiation efficiency of the miniaturized multi-band antenna 10, an increase in clutter interference, and a decrease in signal transmission stability, thereby deteriorating the full-band performance of the miniaturized multi-band antenna 10.

[0048] like Figures 1 to 2 As shown, in one embodiment, the width of the first clearance gap 300 is 0.5mm to 0.7mm, so that the first clearance gap 300 can fully block the parasitic coupling between the fourth antenna stub 220 and the second antenna stub 130 and the third antenna stub 140, avoid near-field coupling between low-frequency band signals and mid-to-high frequency band signals, prevent mid-to-high frequency band resonant frequency shift, reduce mutual interference between low-frequency band signals and mid-to-high frequency band signals, and thus greatly optimize the full-band performance and operational stability of the miniaturized multi-band antenna 10.

[0049] like Figures 1 to 2As shown, in one embodiment, a second bend 250 is formed at the connection between the fourth antenna stub 220 and the fifth antenna stub 230 and at the connection between the fifth antenna stub 230 and the sixth antenna stub 240, so as to improve the space utilization of the second radiating element 200 and optimize the overall assembly area occupied by the second radiating element 200.

[0050] like Figures 1 to 2 As shown, in one embodiment, a second clearance gap 400 exists between the fourth antenna stub 220 and the fifth antenna stub 230, and a third clearance gap 500 exists between the fifth antenna stub 230 and the sixth antenna stub 240. Furthermore, the length direction of the fourth antenna stub 220 is parallel to the length directions of the fifth antenna stub 230 and the sixth antenna stub 240, thereby optimizing the overall electric field distribution of the second radiating element 200 and improving its electromagnetic interference immunity. It is understandable that the miniaturized multi-band antenna 10 needs to simultaneously consider the miniaturized layout requirements of the device and the anti-coupling spacing requirements of the fourth antenna stub 220, the second antenna stub 130, and the third antenna stub 140 during the design phase. This design constraint inevitably compresses the layout space of the fourth antenna stub 220, causing the fourth antenna stub 220 to be offset towards the fifth antenna stub 230. This results in the compression of the width of the second clearance gap 400 between the fourth antenna stub 220 and the fifth antenna stub 230. If the width of the second clearance gap 400 exceeds the critical spacing for parasitic coupling, it will trigger strong parasitic coupling between the fourth antenna stub 220 and the fifth antenna stub 230, thereby interfering with the radiation stability of the second radiating element 200 and greatly reducing the operational stability of the miniaturized multi-band antenna 10.

[0051] like Figures 1 to 2 As shown, in one embodiment, both ends of the fifth antenna stub 230 adjacent to one side of the fourth antenna stub 220 are provided with clearance slots 231. The clearance slots 231 increase the equivalent distance between the fifth antenna stub 230 and the fourth antenna stub 220, suppressing the parasitic coupling phenomenon between the fourth antenna stub 220 and the fifth antenna stub 230. This greatly reduces the electromagnetic interference between the fourth antenna stub 220 and the fifth antenna stub 230, effectively improving the radiation stability of the mid-frequency and high-frequency signals of the second radiating element 200, thereby greatly improving the operational stability of the miniaturized multi-band antenna 10.

[0052] It is understandable that, in order to suppress the parasitic coupling between the fourth antenna stub 220 and the fifth antenna stub 230, the symmetrical ends of the fifth antenna stub 230 are each provided with a clearance slot 231 on one side of the fourth antenna stub 220. This clearance slot 231 increases the equivalent distance between the fifth antenna stub 230 and the fourth antenna stub 220. However, this also leads to a reduction in the overall width of the fifth antenna stub 230, which narrows the radiation frequency band of the second radiator 200. This significantly reduces the multi-band coverage capability of the miniaturized multi-band antenna 10, thereby greatly reducing its applicability.

[0053] like Figures 1 to 2 As shown, in one embodiment, the inner walls of both recessed slots 231 are provided with protruding seventh antenna stubs 260. The two seventh antenna stubs 260 are symmetrically arranged. The connecting portion 261 of the seventh antenna stub 260 is fixedly connected to the fifth antenna stub 230. The length direction of the signal transmitting portion 262 of the seventh antenna stub 260 is parallel to the length direction of the fourth antenna stub 220. The two sides of the signal transmitting portion 262 of the seventh antenna stub 260 are respectively spaced apart from the fourth antenna stub 220 and the fifth antenna stub 230, so that the seventh antenna stub 260 can... It can form a parallel radiation structure with the fifth antenna stub 230, which can not only effectively compensate for the problem of the reduction in the effective radiation width of the fifth antenna stub 230 caused by the opening of the avoidance slot 231, and restore and widen the radiation frequency band of the second radiating element 200, but also further block the parasitic coupling between the fourth antenna stub 220 and the fifth antenna stub 230, strengthen the electric field isolation effect, and at the same time, it can also serve as an internal reinforcing rib to improve the structural deformation resistance of the fifth antenna stub 230, and comprehensively optimize the full-band radiation performance and long-term stability of the miniaturized multi-band antenna 10.

[0054] like Figures 1 to 2 As shown, in one embodiment, the miniaturized multi-band antenna 10 further includes an antenna dielectric substrate 700, on which the first radiating element 100 and the second radiating element 200 are both printed on the first mounting surface 710 of the antenna dielectric substrate 700 to improve the structural compactness of the miniaturized multi-band antenna 10.

[0055] like Figures 1 to 3 As shown, in one embodiment, the miniaturized multi-band antenna 10 further includes a metal ground 800, which is mounted on the second mounting surface 720 of the antenna dielectric substrate 700 so that the metal ground 800 can adjust the impedance matching of the miniaturized multi-band antenna 10 and improve the performance of the miniaturized multi-band antenna 10.

[0056] like Figures 4 to 11 As shown, in one embodiment, the frequency of the low-frequency signal is 0.6 GHz to 0.96 GHz.

[0057] like Figures 4 to 11 As shown, in one embodiment, the frequency of the mid-band signal is 1.4 GHz to 2.7 GHz.

[0058] like Figures 4 to 11 As shown, in one embodiment, the frequency of the high-frequency signal is 3.3 GHz to 5 GHz.

[0059] Furthermore, Figure 4 Scattering parameters S under simulated conditions for a miniaturized multi-band antenna 10 11 (Return loss) curve, such as Figure 4 As shown, the return loss of the miniaturized multi-band antenna 10 is generally less than -10dB across the entire operating frequency band, indicating that the energy reflectivity of the miniaturized multi-band antenna 10 is generally less than 10% across the entire operating frequency band. The vast majority of input energy can be effectively converted into radiated energy, significantly reducing transmission loss and significantly improving antenna radiation efficiency. At the same time, it also effectively reduces the risk of signal attenuation and transmission instability caused by frequency band mismatch, which can better meet the communication needs of multiple scenarios and multiple frequency bands, taking into account the advantages of miniaturized integration and efficient radiation performance across the entire frequency band, thereby greatly improving the practicality and compatibility of the miniaturized multi-band antenna 10.

[0060] Furthermore, Figure 5 The VSWR (Voltage Standing Wave Ratio) curve of a miniaturized multi-band antenna 10 under simulated conditions is shown below. Figure 5 As shown, the voltage standing wave ratio (VSWR) of the miniaturized multi-band antenna 10 is generally less than 2 and generally close to 1 across the entire operating frequency band. This indicates that the miniaturized multi-band antenna 10 has good impedance matching in each operating frequency band, low energy reflectivity of the input signal, and most of the energy can be effectively radiated into space, significantly reducing transmission loss and improving the radiation efficiency of the miniaturized multi-band antenna 10.

[0061] like Figure 6 and Figure 7 As shown, when the miniaturized multi-band antenna 10 radiates low-frequency signals, its surface current is mainly concentrated on the second antenna stub 130 and the third antenna stub 140. Thus, the second antenna stub 130 and the third antenna stub 140 together constitute the core current path for low-frequency radiation of the miniaturized multi-band antenna 10, providing an effective electrical length that meets the operating frequency band requirements for the miniaturized multi-band antenna 10 to achieve low-frequency resonance. At the same time, the distribution characteristic of the low-frequency current being concentrated in the designated stub makes the low-frequency radiation energy more focused, effectively reducing the ineffective loss of current in other areas of the miniaturized multi-band antenna 10, and significantly improving the low-frequency radiation efficiency.

[0062] like Figures 8 to 11As shown, the miniaturized multi-band antenna 10 exhibits a radiation pattern that is nearly spherical across its entire operating frequency band, from low to high frequencies. This indicates that the miniaturized multi-band antenna 10 possesses excellent omnidirectional radiation characteristics and good all-space coverage performance. Figures 1 to 2 As shown, in one embodiment, a hollow area 121 is formed at one end of the first antenna stub 120 adjacent to the second antenna stub 130 to reduce the width of the end of the first antenna stub 120 adjacent to the second antenna stub 130. This not only saves the materials required for manufacturing the first antenna stub 120, but also changes the current path, improves the impedance matching of the first antenna stub 120, and further improves the performance of the miniaturized multi-band antenna 10.

[0063] This disclosure also provides an external terminal device, including the miniaturized multi-band antenna 10 described in any of the above embodiments.

[0064] Compared with the prior art, this disclosure has at least the following advantages: 1. In the aforementioned external terminal device, the first radiating element 100 has multiple first bends 110, which are spaced apart to create a curved structure. The first radiating element 100 radiates low-frequency signals, allowing it to significantly extend the current propagation path length within a limited space and reduce its resonant frequency. This enables it to radiate low-frequency signals. Furthermore, the curved structure improves space utilization and optimizes the assembly volume of the first radiating element 100. Compared to the full-band antennas in the aforementioned related technologies that broaden the radiation frequency band through symmetrical coupling, this design achieves a more efficient and efficient radiation. The curved structure design of the first radiating element 100 of the miniaturized multi-band antenna 10 disclosed herein not only reduces energy consumption but also improves the radiation efficiency of a single frequency band in the low-frequency band and reduces interference from clutter in the signal. This makes the low-frequency signal radiated by the miniaturized multi-band antenna 10 more stable, thereby greatly improving the stability of external terminal devices and the user experience. At the same time, compared with the first radiating antenna of the full-band antenna in the above-mentioned related technologies, the first radiating element 100 of this disclosure can achieve low-frequency signal radiation without meeting the dimensional accuracy requirements of symmetrical coupling, effectively reducing its own manufacturing difficulty and thus greatly reducing the manufacturing difficulty of the miniaturized multi-band antenna 10.

[0065] 2. Since the second radiating element 200 has a symmetrical structure, it is used to radiate mid-frequency and high-frequency signals, so that the second radiating element 200 can broaden its own radiation frequency band signal through symmetrical coupling, and can stably radiate mid-frequency and high-frequency signals. A first clearance gap 300 is formed between the first radiating element 100 and the second radiating element 200, so that a physical distance is formed between the first radiating element 100 and the second radiating element 200, reducing the interference between low-frequency signals and mid-to-high-frequency signals, so that the miniaturized multi-band antenna 10 can stably radiate low-frequency and mid-to-high-frequency signals, thereby greatly improving the stability of the external terminal equipment.

[0066] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A miniaturized multi-band antenna, characterized in that, The device includes a first radiating element and a second radiating element. The first radiating element has a plurality of first bends, which are spaced apart from each other to make the first radiating element have a curved structure. The first radiating element is used to radiate low-frequency signals. The second radiating element has a symmetrical structure and is used to radiate mid-frequency signals and high-frequency signals. A first clearance gap is formed between the first radiating element and the second radiating element.

2. The miniaturized multi-band antenna according to claim 1, characterized in that, The first radiating element includes a first antenna stub, a second antenna stub, and a third antenna stub connected in sequence. The width of the first antenna stub is greater than the width of the second antenna stub, and the width of the third antenna stub is greater than the width of the second antenna stub. A plurality of first bends are formed on the second antenna stub to make the second antenna stub have a curved structure.

3. The miniaturized multi-band antenna according to claim 2, characterized in that, The first antenna stub has a rectangular structure, and the third antenna stub has a feed pad welded to and electrically connected to the end away from the second antenna stub.

4. The miniaturized multi-band antenna according to claim 1, characterized in that, The miniaturized multi-band antenna also includes a grounding pad, which is welded to and electrically connected to the axis of symmetry of the second radiating element.

5. The miniaturized multi-band antenna according to claim 4, characterized in that, The second radiating element includes a fourth antenna stub, a fifth antenna stub, and a sixth antenna stub connected in sequence. The fourth antenna stub, the fifth antenna stub, and the sixth antenna stub are all symmetrical structures. The grounding pad is welded and electrically connected to the axis of symmetry of the fourth antenna stub. The first clearance gap is formed between the fourth antenna stub and the first radiating element.

6. The miniaturized multi-band antenna according to claim 5, characterized in that, The connection between the fourth antenna segment and the fifth antenna segment, as well as the connection between the fifth antenna segment and the sixth antenna segment, are both provided with a second bend.

7. The miniaturized multi-band antenna according to claim 6, characterized in that, Both ends of the fifth antenna stub have recessed slots on one side adjacent to the fourth antenna stub.

8. The miniaturized multi-band antenna according to claim 7, characterized in that, The miniaturized multi-band antenna also includes an antenna dielectric substrate, wherein the first radiating element and the second radiating element are both printed on the first mounting surface of the antenna dielectric substrate.

9. The miniaturized multi-band antenna according to claim 8, characterized in that, The miniaturized multi-band antenna further includes a metal ground plane, which is mounted on a second mounting surface of the antenna dielectric substrate; and / or The frequency of the low-frequency signal is 0.6 GHz to 0.96 GHz; and / or, The frequency of the mid-frequency signal is 1.4 GHz to 2.7 GHz; and / or, The frequency of the high-frequency signal is 3.3 GHz to 5 GHz; and / or, The first antenna stub also has a hollowed-out area at one end adjacent to the second antenna stub; and / or, The inner walls of both of the two recessed slots are provided with a seventh antenna stub. The two seventh antenna stubs are symmetrically arranged. The connecting part of the seventh antenna stub is fixedly connected to the fifth antenna stub. The length direction of the signal transmitting part of the seventh antenna stub is parallel to the length direction of the fourth antenna stub. The two sides of the signal transmitting part of the seventh antenna stub are respectively spaced apart from the fourth antenna stub and the fifth antenna stub.

10. An external terminal device, characterized in that, The miniaturized multi-band antenna includes any one of claims 1 to 9.

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