Mobile phone antenna for exciting floor characteristic mode based on shunt feed technology and electronic equipment

Abstract

The invention relates to the technical field of mobile phone antennas, in particular to a mobile phone antenna and electronic equipment for exciting a floor characteristic mode based on a shunt feed technology, and the mobile phone antenna comprises a dielectric substrate, an antenna radiation metal patch on the outer side of the dielectric substrate, a metal floor arranged below the dielectric substrate, a low-frequency inverted-F antenna and a power divider, a first low-frequency feed port and a second low-frequency feed port are respectively arranged on corresponding radiation patches on two sides of the metal floor, and the two feed ports are simultaneously and electrically connected with an output end of the power divider through feeder lines, so that parallel feed of the low-frequency inverted-F antenna is realized, low-frequency characteristic modes of two long sides of the metal floor are simultaneously excited, and the low-frequency inverted-F antenna is formed. The low-frequency-band radiation efficiency is improved, the working bandwidth is expanded, and integration with a radio frequency circuit of the whole mobile phone can be completed only through a single excitation source.

Description

Technical Field

[0001] This invention relates to the field of mobile phone antenna technology, specifically a mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode. Background Technology

[0002] With the rapid development of wireless communication technology, the low-frequency band (704-960MHz) is hailed as the "golden band" due to its advantages such as low propagation loss, wide coverage, strong penetration, and low networking cost. However, traditional low-frequency antenna design faces many challenges: First, low-frequency radiation efficiency is easily affected by the distribution of ground current and proximity coupling effects, resulting in low radiation efficiency; second, the bandwidth of low-frequency antennas is generally narrow, making it difficult to meet the needs of multi-band, wideband communication systems. In existing technologies, metal ground planes are often used as radiators for antennas, but their low-frequency characteristic modes are not sufficiently excited. Although traditional single-feed methods can excite some modes of the ground plane, they are difficult to significantly improve antenna performance, resulting in limited bandwidth or low efficiency. Although some studies have optimized ground plane modes through impedance matching networks or electromagnetic coupling structures, these solutions often require the introduction of complex circuits or additional structures, increasing design complexity and manufacturing costs, and may deteriorate radiation performance due to the introduction of parasitic branches.

[0003] In recent years, antenna design based on characteristic mode theory has gradually attracted attention. This theory reveals the intrinsic radiation characteristics of the ground plane through modal analysis, providing theoretical guidance for mode excitation. However, how to efficiently excite the characteristic modes of the ground plane in the low-frequency band while achieving both wide bandwidth and high efficiency remains a technical bottleneck that urgently needs to be overcome. To address this challenge, this study proposes an innovative parallel feeding method. By optimizing the feeding position, it synergistically excites the low-frequency characteristic modes of the two long sides of the ground plane, significantly improving antenna efficiency and expanding the operating bandwidth, providing a new approach for the design of next-generation compact low-frequency antennas. The parallel feeding technology based on phase difference was first proposed in the invention patent "A mobile phone antenna and electronic device based on common mode and differential mode" (patent publication number: CN117748173A). However, this invention mainly eliminates the local minimum radiation efficiency points generated by the inverted-F antenna with parasitic branches through the parallel feeding method with phase difference, thereby achieving common mode of slot antenna in a wide frequency band. However, the above invention did not combine characteristic mode theory to apply the parallel feeding technology to improve the efficiency of low-frequency antennas. This invention utilizes parallel feeding technology to fully excite the low-frequency characteristic modes of the ground plane, significantly improving the efficiency and bandwidth of low-frequency antennas. Based on the above technology, this invention designs a high-efficiency and wide-bandwidth low-frequency mobile phone antenna. Summary of the Invention

[0004] The purpose of this invention is to provide a mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode, so as to solve the technical problems mentioned in the background art.

[0005] Based on the above ideas, the present invention provides the following technical solution:

[0006] A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode, comprising:

[0007] Dielectric substrate; Antenna radiating metal patch disposed on the outside of the dielectric substrate; Metal ground plane disposed below the dielectric substrate; Low-frequency inverted-F antenna; Power divider;

[0008] The antenna radiating metal patch is provided with a first low-frequency feed port and a second low-frequency feed port.

[0009] The dielectric substrate is perpendicularly connected to the dielectric substrate, and the metal ground plane covers the bottom of the dielectric substrate and has a width greater than the width of the dielectric substrate.

[0010] The antenna radiating metal patches are respectively disposed on the outer side of the dielectric substrate.

[0011] The feed wire connecting the metal floor to the first low-frequency feed port and the feed wire connecting the metal floor 2 to the second low-frequency feed port are simultaneously electrically connected to the output terminal of the power divider to provide parallel power to the first low-frequency feed port and the second low-frequency feed port, thereby exciting the low-frequency characteristic mode of the metal floor.

[0012] By introducing a metal ground plane (FSP) located below the dielectric substrate, with a width greater than the width of the side dielectric plates, and placing a first low-frequency (LHF) feed port and a second LHF feed port on corresponding radiating patches on both sides of the FSP, and then using a power divider to achieve parallel feeding of the two feed ports, the LHF inverted-F antenna is no longer limited to exciting only one edge, but can simultaneously form a strong current distribution on both long sides of the FSP, thereby effectively exciting the low-frequency characteristic modes of the FSP. This structure significantly improves the radiation efficiency and operating bandwidth in the low-frequency band with limited space, while taking into account the radiation advantages of the large size of the metal FSP and the arrangement flexibility of multiple patch antennas. It is suitable for mobile terminal applications with limited low-frequency performance within a limited overall device size.

[0013] Preferably, the dielectric substrate is an FR-4 dielectric board with a dielectric constant of approximately 4.3, wherein the thickness of the dielectric substrate is 0.5 mm, the thickness of the dielectric substrate is 0.8 mm, and the thickness of the antenna radiating metal patch is 0.02 mm.

[0014] By uniformly selecting FR-4 material with a dielectric constant of approximately 4.3 as the dielectric substrate, and by limiting the thicknesses of the vertical and horizontal plates, as well as the thickness of the radiating metal patch, it is beneficial to obtain a stable and repeatable electromagnetic environment and mechanical structure in actual processing. The clear definition of the dielectric thickness and patch thickness ensures stable coupling between the patch and the ground plane, reducing the impact of process deviations on the resonant frequency and matching characteristics. Furthermore, it helps control the overall antenna height and rigidity, enabling the stable achievement of the expected low-frequency characteristic mode excitation effect and consistent antenna performance under mass production conditions.

[0015] Preferably, the distance between the first low-frequency feed port and the corresponding short-circuit point is 10mm and the distance between the first low-frequency feed port and the corresponding open-circuit point is 45mm, the distance between the second low-frequency feed port and the corresponding short-circuit point is 10mm and the distance between the second low-frequency feed port and the corresponding open-circuit point is 45mm, and the total length of the low-frequency inverted-F antenna is 110mm.

[0016] By precisely defining the distances between the first and second low-frequency feed ports and their respective short-circuit and open-circuit points, as well as the total length of the low-frequency inverted-F antenna, a reasonable electrical length distribution and voltage and current distribution are achieved near the target low-frequency operating band. The precise configuration of the distances between the feed points and the short-circuit and open-circuit ends facilitates good impedance matching and balanced excitation of the currents on both long sides under parallel feeding conditions, avoiding excessive concentration or insufficient excitation on one side. This results in superior standing wave characteristics, radiation efficiency, and coverage bandwidth in the low-frequency band, improving the engineering feasibility and design controllability of the scheme.

[0017] Preferably, the first low-frequency feed port and the second low-frequency feed port are respectively connected to the two output terminals of the power divider.

[0018] Connecting the first and second low-frequency feed ports to the two outputs of the power divider allows for excitation with defined amplitude and phase relationships to be provided to both feed ports from the same low-frequency signal source. Centralized distribution via the power divider avoids the structural complexity and matching difficulties associated with independent dual feeds, while ensuring good controllability in power distribution and phase consistency between the two feeds. This facilitates obtaining a stable and symmetrical current distribution when exciting the characteristic mode of the ground plane, improving the simplicity and reliability of the parallel feed scheme.

[0019] Preferably, the first low-frequency feed port and the second low-frequency feed port are spaced a certain distance apart and are both electrically connected to the power divider.

[0020] By setting a specific distance between the first and second low-frequency feed ports and ensuring both are electrically connected to the power divider, the geometric layout can balance the separation of the two excitation paths and the rational distribution of electromagnetic coupling. The appropriate spacing between the feed ports helps to form suitable current distribution paths, allowing the characteristic modes on both long sides to be excited more evenly. This reduces the equivalent single-point excitation effect caused by feed points being too close together, and also avoids insufficient excitation on one side due to excessive distance, thereby optimizing the coupling efficiency and radiation pattern characteristics of the low-frequency modes overall.

[0021] Preferably, the output terminal of the power divider is electrically connected to the first low-frequency feed port and the second low-frequency feed port, and a matching element is connected in series at the input terminal of the power divider.

[0022] By connecting the output of the power divider to two low-frequency feed ports and connecting a matching element in series at the input of the power divider, the equivalent input impedance after parallel feeding can be precisely corrected without changing the overall structure of the terminal. Through the selection and adjustment of the matching inductor or capacitor, the impedance changes introduced by the parallel feeding can be compensated, the low-frequency operating bandwidth can be widened, the VSWR can be reduced, and a certain adjustment margin can be provided in different overall installation environments, improving the antenna's adaptability and overall radiation efficiency in actual terminals.

[0023] Preferably, when the low-frequency inverted-F antenna is fed only through the first low-frequency feed port, the low-frequency inverted-F antenna can only excite the characteristic modes of one long side of the metal ground plane; when the second low-frequency feed port is added, and the first low-frequency feed port and the second low-frequency feed port are connected to the output terminal of the power divider to achieve parallel feeding, the low-frequency inverted-F antenna can simultaneously excite the characteristic modes of both long sides of the metal ground plane.

[0024] By comparing the excitation effects of single-ended feeding and parallel feeding with two feed ports, the fundamental improvement of this scheme in the excitation method of the ground characteristic modes is clearly demonstrated. With single-ended feeding, a significant current distribution can only be formed on one long side of the ground, resulting in a limited equivalent size of the usable radiator and restricted low-frequency efficiency. However, after adding a second low-frequency feed port and using a power divider to achieve parallel feeding, the characteristic modes of both long sides can be excited simultaneously, significantly increasing the equivalent radiation size. This leads to higher radiation efficiency and a wider operating bandwidth in the low-frequency band, and also provides an effective approach for low-frequency antenna design under conditions of limited internal space in the terminal.

[0025] The technical solution of the present invention may include the following beneficial effects:

[0026] This invention addresses this issue by setting feed ports for low-frequency inverted-F antennas on the two long sides of a metal floor and using a power divider to achieve parallel feeding of the two feed ports, thus fully exciting the low-frequency characteristic modes on both long sides of the floor. Compared to exciting only one edge, this structure significantly increases the equivalent radiated current path length and effective radiating area. Even with limited internal space in the terminal, it can still effectively improve the radiation efficiency in the low-frequency band and reduce losses, thereby improving the overall transmission and reception performance of the device in the low-frequency operating band.

[0027] This invention utilizes a parallel-fed excitation ground plane to drive the characteristic modes of the two long sides, effectively expanding the low-frequency operating bandwidth of the antenna while maintaining a compact structure. By connecting matching components such as inductors and capacitors in series at the input of the power divider, a dual-resonance or multi-resonance response is formed, enabling the antenna to obtain a wider standing wave bandwidth and more stable impedance matching characteristics in the target low-frequency band. This achieves continuous coverage of the existing low-frequency band and meets the requirements of multi-standard, multi-band mobile communication terminals for low-frequency broadband antennas.

[0028] This invention achieves dual-branch parallel power supply while requiring only a single excitation source to drive both power supply ports. By using a power divider to distribute the input signal power and a phase shifter to control the amplitude and phase relationship of the two power supplies as needed, it avoids the increased number of RF channels and circuit design complexity caused by independent multi-port power supply, while also considering system integration and cost control. This facilitates direct integration and application in existing terminal RF architectures. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0030] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0031] Figure 3 This is a schematic diagram of a single low-frequency inverted-F antenna.

[0032] Figure 4 This is a schematic diagram of the structure of the parallel-fed dual low-frequency inverted-F antenna of the present invention.

[0033] Figure 5 This is a schematic diagram illustrating the mode importance of a single low-frequency inverted L-antenna on the ground.

[0034] Figure 6 This is a schematic diagram illustrating the mode importance of the dual low-frequency inverted L-shaped antenna ground plane of the present invention.

[0035] Figure 7 A comparison of the mode importance of a single low-frequency inverted-L antenna on the ground plane and the mode importance of a dual low-frequency inverted-L antenna on the ground plane.

[0036] Figure 8A comparison diagram of a single low-frequency inverted-F antenna and the parallel-fed dual low-frequency inverted-F antenna S11 of the present invention.

[0037] Figure 9 This is a schematic diagram of the current distribution of a single low-frequency inverted L antenna on the floor in Mode 1.

[0038] Figure 10 This is a schematic diagram of the current distribution of the dual low-frequency inverted L antenna of the present invention on the ground in mode 1.

[0039] Figure 11 This is a comparison chart of the radiation efficiency of a standalone low-frequency inverted-F antenna and the parallel-fed dual low-frequency inverted-F antenna of the present invention.

[0040] Figure 12 This is a comparison chart of the efficiency of a single low-frequency inverted-F antenna and the parallel-fed dual low-frequency inverted-F antenna system of the present invention.

[0041] Figure 13 This is a mobile phone antenna based on parallel feeding technology to excite the ground characteristic mode in Example 2.

[0042] Figure 14 This is a schematic diagram of the transverse and longitudinal characteristic modes of the excitation floor in Example 3 using the co-feeding technology.

[0043] Figure 15 This is a schematic diagram of the transverse and longitudinal characteristic modes of the excitation floor in the parallel feeding technology with phase difference in Example 3.

[0044] Figure 16 This is a schematic diagram of the first type of excitation of characteristic modes based on parallel feeding technology using a line antenna (T-type antenna) in Example 4.

[0045] Figure 17 This is a second schematic diagram of the excitation of characteristic modes based on parallel feeding technology using a line antenna (T-type antenna) in Example 4.

[0046] Figure 18 This is a schematic diagram of the third type of characteristic mode excitation based on parallel feeding technology using a line antenna (T-type antenna) in Example 4.

[0047] Figure 19 This is a schematic diagram of the first type of excitation of characteristic modes based on patch antenna using parallel feeding technology in Example 5.

[0048] Figure 20 This is a second schematic diagram of the excitation of characteristic modes based on patch antenna using parallel feeding technology in Example 5.

[0049] Figure 21 This is a schematic diagram of the third type of characteristic mode excitation based on patch antenna using parallel feeding technology in Example 5.

[0050] In the figure, 1a, 1b, 1c, 1d, and 1e are dielectric substrates; 2 is a metal ground plane; 3, 4, 5, and 6 are antenna radiating metal patches; 7 is the first low-frequency feed port; 8 is the second low-frequency feed port; 9 is a power divider; and 10 is a low-frequency feed port. A represents the mode importance of a single low-frequency inverted-L antenna on the ground plane; B represents the mode importance of dual low-frequency inverted-L antennas on the ground plane; C represents a single-feed-excited low-frequency inverted-F antenna; and D represents the parallel-feed-excited dual-inverted-F low-frequency antenna proposed in this invention. Detailed Implementation

[0051] Example 1

[0052] This invention relates to a mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode. According to the design schematic, a specific embodiment of a mobile phone antenna covering the low-frequency band (704-960MHz) is given below with reference to the accompanying drawings:

[0053] like Figure 1 As shown, this embodiment uses a parallel-fed dual inverted-F antenna on the ground plane to fully excite the characteristic modes of the long side of the ground plane at low frequencies, thereby widening the antenna bandwidth and improving antenna efficiency. To reduce the number of feed ports, a power divider is used to implement two inverted-F antennas for a single-feed excitation antenna.

[0054] like Figure 2 As shown, the antenna includes four FR-4 dielectric substrates 1a, 1b, 1c, 1d, and 1e with a dielectric constant of 4.3. Dielectric substrate 1e is perpendicularly connected to dielectric substrates 1a, 1b, 1c, and 1d. A metal ground plate 2, slightly wider than dielectric substrate 1d, covers the underside of dielectric substrate 1e. The thickness of 1a, 1b, 1c, and 1d is 0.5 mm, and the thickness of 1e is 0.8 mm. Antenna radiating metal patches 3, 4, 5, and 6, each 0.02 mm thick, cover the outside of dielectric substrates 1a, 1b, 1c, and 1d, respectively. A first low-frequency feed port 7 connecting the metal ground plate 2 to the antenna radiating metal patch 3 and a second low-frequency feed port 8 connecting the metal ground plate 2 to the antenna radiating metal patch 5 are simultaneously connected to a power divider for parallel feeding to excite the ground plate characteristic mode. Feed ports 7 and 8 are connected to the two output terminals of the power divider 9 for feeding. 10 is a low-frequency feed port connected to the input terminal of the power divider. The low-frequency antenna is excited by parallel feeding of the dual inverted-F antenna, thereby fully exciting the characteristic modes of the long side of the ground plane at low frequencies, thus widening the antenna bandwidth and improving antenna efficiency.

[0055] like Figure 3 , Figure 4 The diagram shows a single-fed low-frequency inverted-F antenna and a parallel-fed dual low-frequency inverted-F antenna according to the present invention.

[0056] like Figure 5The diagram shows the mode importance of the ground plane when using a single low-frequency inverted-L antenna. Mode 1 has the highest mode importance, therefore it is the dominant mode of the ground plane at low frequencies. Figure 6 The diagram shows the mode importance of the ground plane with dual low-frequency inverted-L antennas. Similarly, Mode 1 has the highest mode importance, therefore it is the dominant mode of the ground plane at low frequencies in this configuration. To compare the differences between the two Mode 1 modes, as shown... Figure 7 As shown, it can be found that the mode 1 importance of the ground plane with dual low-frequency inverted L antennas is closer to 1 than that with a single low-frequency inverted L antenna. Therefore, the dual low-frequency inverted L structure can better excite the characteristic modes of the ground plane, and thus has a wider bandwidth.

[0057] like Figure 8 The diagram shows a comparison between a single low-frequency inverted-F antenna and the parallel-fed dual low-frequency inverted-F antenna S11 of this invention. Compared to a single inverted-F antenna, the parallel-fed dual inverted-F antenna improves the antenna bandwidth, which is consistent with... Figure 4 The conclusions drawn from the perspective of modal importance are consistent.

[0058] like Figure 9 The diagram shows the current distribution of a single low-frequency inverted-L antenna on the floor in Mode 1 (850MHz). In this mode, the current is higher on the long side of the floor where the inverted-L stub is located, and lower on the other side. Figure 10 The diagram shows the current distribution of a dual low-frequency inverted-L antenna on a ground plane in mode 1 (850MHz). The current is relatively large on both long sides of the ground plane, indicating that the characteristic mode of the ground plane at the low frequency of 850MHz is fully excited, resulting in good antenna efficiency.

[0059] like Figure 11 The diagram shows a comparison of the radiation efficiency of a single low-frequency inverted-F antenna and the parallel-fed dual low-frequency inverted-F antenna proposed in this invention. In the low-frequency band (704-960MHz), the parallel-fed dual low-frequency inverted-F antenna proposed in this invention can improve the radiation efficiency by an average of 1.2dB compared to a single-fed low-frequency inverted-F antenna. Figure 12 The figure shows a comparison of the system efficiency between a single-fed low-frequency inverted-F antenna and a parallel-fed dual low-frequency inverted-F antenna system according to the present invention. In the low-frequency band, the parallel-fed dual low-frequency inverted-F antenna proposed in this invention can improve the system efficiency by an average of 3.1 dB compared to a single-fed low-frequency inverted-F antenna.

[0060] This embodiment achieves dual resonance through the coordinated operation of a matching circuit and parallel feeding technology. Firstly, addressing the issues of low efficiency and narrow bandwidth in low-frequency antennas, this invention proposes a parallel feeding method to excite the dual inverted-F antenna, thereby fully exciting the ground-floor characteristic mode, improving antenna efficiency and widening the antenna bandwidth. Secondly, for the inputs at both ends of the phase shifter, to reduce the number of input ports, a power divider is added to the input terminals of the phase shifter, enabling the dual inverted-F antenna to be excited using only one feeding port. Finally, to ensure normal frequency band coverage, a matching circuit is added to the input terminal of the power divider to achieve dual resonance.

[0061] Example 2

[0062] Based on Example 1, see Figure 13 This embodiment provides another mobile phone antenna based on parallel feeding technology to excite the ground characteristic mode, and... Figure 1 The difference is, Figure 13 A phase shifter is added to the output of the power divider, and the ground characteristic mode is excited by adding a parallel feed technique with a phase difference, thereby improving antenna efficiency and extending antenna bandwidth. This technique is still based on the parallel feed technique proposed in this invention to excite the ground characteristic mode and improve antenna performance, and therefore is also within the protection scope of this invention.

[0063] By placing a phase shifter between the power divider output and the two low-frequency feed ports, and introducing a predetermined phase difference between the two feed signals, the excitation mode of the ground characteristic mode can be further finely controlled. An appropriate phase difference not only helps establish a more ideal current phase relationship between the two long sides, enhancing the target mode and suppressing unwanted parasitic modes, but also optimizes the antenna's radiation pattern and overall radiation efficiency to a certain extent. This structure provides additional degrees of freedom for integrating the electromagnetic performance of the terminal in different frequency bands and installation environments, improving the engineering robustness and adaptability of the solution.

[0064] Example 3

[0065] Based on Examples 1 and 2, see Figure 14 , 15 This embodiment provides another mobile phone antenna based on parallel feeding technology to excite the lateral and longitudinal characteristic modes of the ground plane. Figure 1 The difference is, Figure 14 By using parallel feeding technology to excite the transverse and longitudinal characteristic modes of the ground plane, antenna efficiency and bandwidth can be improved. Figure 8 The difference is, Figure 15 By using a parallel feeding technique with phase difference to excite the lateral and longitudinal characteristic modes of the ground plane, antenna efficiency and bandwidth can be improved. This technique is still based on the parallel feeding technique proposed in this invention to excite the ground plane characteristic modes and improve antenna performance, and therefore is also within the scope of protection of this invention.

[0066] Example 4

[0067] Based on Examples 1-3, see Figure 16-18 This embodiment provides another mobile phone antenna based on parallel feeding technology to excite the lateral and longitudinal characteristic modes of the ground plane. Unlike Examples 1-3, Figure 16-18 This technology utilizes parallel feeding techniques to excite characteristic modes and improve antenna performance based on a line antenna (T-type antenna). This technique is still a variation of the parallel feeding technique proposed in this invention to excite ground-side characteristic modes and improve antenna performance, and therefore falls within the scope of protection of this invention.

[0068] Example 5

[0069] Based on Examples 1-4, see Figure 19-21 This embodiment provides another mobile phone antenna based on parallel feeding technology to excite the lateral and longitudinal characteristic modes of the ground plane. Unlike embodiments 1-3, Figure 19-21 Based on a patch antenna, a parallel feeding technique is used to excite the characteristic modes and improve antenna performance. This technique is still a variation of the parallel feeding technique proposed in this invention to excite the ground plane characteristic modes and improve antenna performance, and therefore is also within the protection scope of this invention.

[0070] It should be emphasized that the technical solution of this invention is not limited to frequency bands (including but not limited to 4G, 5G, millimeter-wave bands, and other mobile communication bands), nor to the physical structural parameters of this example (including antenna element size, ground plane structure shape, dielectric substrate thickness, and other geometric features), nor to matching network limitations, nor to limitations on whether or not a phase shifter is added and the type of phase shifter, nor to limitations on power divider type (such as active and passive power dividers), nor to limitations on radiating antenna type (such as linear antennas, slot antennas, patch antennas, etc.), nor to limitations on antenna placement, nor to limitations on characteristic modes of different structures (such as metal ground plane structures and non-metal ground plane structures). Modifications to matching network parameters, antenna size, phase shifter angle, power divider type, characteristic mode structure, etc., can be applied to other frequency bands. Any technical modifications based on parallel feeding technology to excite characteristic modes and thereby improve antenna performance according to the technical solution of this invention should fall within the protection scope of this invention.

Claims

1. A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode, characterized in that, include: Dielectric substrates (1a, 1b, 1c, 1d, 1e); Antenna radiating metal patches (3, 4, 5, 6) disposed on the outside of the dielectric substrate (1a, 1b, 1c, 1d); Metal ground plane (2) disposed below the dielectric substrate (1e); Low-frequency inverted F antenna; Power divider (9); The antenna radiating metal patch (3) is provided with a first low-frequency feed port (7), and the antenna radiating metal patch (5) is provided with a second low-frequency feed port (8). The dielectric substrate (1e) is perpendicularly connected to the dielectric substrates (1a, 1b, 1c, 1d), and the metal floor (2) covers the underside of the dielectric substrate (1e) and has a width greater than that of the dielectric substrate (1d). The antenna radiating metal patches (3, 4, 5, 6) are respectively disposed on the outer side of the dielectric substrate (1a, 1b, 1c, 1d); The feed wire connecting the metal floor (2) to the first low-frequency feed port (7) and the feed wire connecting the metal floor (2) to the second low-frequency feed port (8) are simultaneously electrically connected to the output terminal of the power divider (9) to provide parallel power to the first low-frequency feed port (7) and the second low-frequency feed port (8), thereby exciting the low-frequency characteristic mode of the metal floor (2).

2. A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode according to claim 1, characterized in that: The dielectric substrates (1a, 1b, 1c, 1d, 1e) are FR-4 dielectric boards with a dielectric constant of approximately 4.

3. The thickness of the dielectric substrates (1a, 1b, 1c, 1d) is 0.5 mm, the thickness of the dielectric substrate (1e) is 0.8 mm, and the thickness of the antenna radiating metal patches (3, 4, 5, 6) is 0.02 mm.

3. A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode according to claim 2, characterized in that: The distance between the first low-frequency feed port (7) and the corresponding short-circuit point is 10mm and the distance between the first low-frequency feed port (7) and the corresponding open-circuit point is 45mm. The distance between the second low-frequency feed port (8) and the corresponding short-circuit point is 10mm and the distance between the second low-frequency feed port (8) and the corresponding open-circuit point is 45mm. The total length of the low-frequency inverted F antenna is 110mm.

4. A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode according to claim 3, characterized in that: The first low-frequency power supply port (7) and the second low-frequency power supply port (8) are respectively connected to the two output terminals of the power divider (9).

5. A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode according to claim 4, characterized in that: The first low-frequency feed port (7) and the second low-frequency feed port (8) are set at a specific distance apart and are both electrically connected to the power divider (9).

6. A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode according to claim 5, characterized in that: The output terminal of the power divider (9) is electrically connected to the first low-frequency feed port (7) and the second low-frequency feed port (8), and a matching element is connected in series at the input terminal of the power divider (9).

7. A mobile phone antenna and electronic device based on parallel feeding technology to excite the ground characteristic mode according to claim 6, characterized in that: When the low-frequency inverted-F antenna is fed only through the first low-frequency feed port (7), the low-frequency inverted-F antenna can only excite the characteristic modes of one long side of the metal ground plane (2); when the second low-frequency feed port (8) is added, and the first low-frequency feed port (7) and the second low-frequency feed port (8) are connected to the output terminal of the power divider (9) to achieve parallel feeding, the low-frequency inverted-F antenna can simultaneously excite the characteristic modes of both long sides of the metal ground plane (2).

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