Antenna device and terminal device

Abstract

The application provides an antenna device and a terminal device, wherein the antenna device comprises an antenna patch, a feed line, a capacitor and a ground line, one end of the feed line is connected with the antenna patch, the other end of the feed line is connected with the capacitor in series, one end of the ground line is connected with the antenna patch, and the other end of the ground line is used for connecting a floor, and a space is kept between the antenna patch and the floor, wherein the antenna patch, the feed line and the ground line jointly excite three resonant working modes, and the low frequency bandwidth of the antenna device is increased. The antenna device and the floor jointly form three resonant loops through the joint action of the antenna patch, the feed line, the capacitor and the ground line, that is, three resonant working modes are excited, so that the antenna device has a larger low frequency bandwidth and can cover a frequency band of 698MHz-1500MHz; meanwhile, the structure and size of the antenna device are simplified under the condition of ensuring good radiation performance, so that the antenna device is more simple and compact, and the miniaturization design requirement is met.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an antenna device and terminal equipment. Background Technology

[0002] With the development of communication technology, the application of various wireless terminal products is becoming increasingly widespread. While enjoying the convenience brought by wireless communication devices, the public is also increasingly demanding higher portability of terminals, requiring antennas to integrate more and more frequency bands. For low frequencies, due to the long wavelength and small terminal size, bandwidth expansion in low frequencies is a bottleneck in antenna design.

[0003] Existing technologies typically extend low-frequency bandwidth by increasing antenna size, but excessively large antennas are detrimental to the size design of terminal products. Furthermore, existing technologies also employ antenna switches to change antenna operating states to achieve low-frequency bandwidth coverage, but adding antenna switches incurs additional costs and introduces other technical issues related to antenna switches. Summary of the Invention

[0004] The purpose of this application is to provide an antenna device and terminal equipment to solve the problem that the prior art causes the antenna size to be too large or increases the cost of antenna switching in order to expand the low frequency bandwidth.

[0005] The first aspect of this application provides an antenna device comprising an antenna patch, a feed line, a capacitor, and a ground wire. One end of the feed line is connected to the antenna patch for powering the antenna patch, and the other end of the feed line is connected in series with the capacitor, which is connected to a ground plane. One end of the ground wire is connected to the antenna patch, and the other end of the ground wire is connected to the ground plane. A gap is maintained between the antenna patch and the ground plane. The combined action of the antenna patch, the feed line, and the ground wire excites three resonant operating modes, increasing the low-frequency bandwidth of the antenna device.

[0006] The antenna device provided in this application can form three resonant circuits with the ground plane through the combined action of the antenna patch, feed line, capacitor and ground wire, that is, excite three resonant operating modes. This allows the antenna device to obtain a large low-frequency bandwidth without any additional components such as antenna switches, covering the frequency band of 698MHz-1500MHz. At the same time, while ensuring good radiation performance, the structure and size of the antenna device are simplified, making it simpler and more compact, and meeting the requirements of miniaturization design.

[0007] In one possible implementation, the antenna patch includes a first horizontally radiating metal patch, a first vertically radiating metal patch, and a second vertically radiating metal patch. The first and second vertically radiating metal patches are respectively vertically connected to both ends of the first horizontally radiating metal patch, and both extend towards the ground plane. The feed wire and the ground wire are both connected to the first horizontally radiating metal patch at their ends away from the ground plane. The feed wire is positioned between the ground wire and the first vertically radiating metal patch. This allows the antenna to have good radiation performance and also helps to broaden the low-frequency bandwidth.

[0008] In one possible implementation, the grounding wire is connected to the center of the first horizontal radiating metal patch, and the first and second vertical radiating metal patches are symmetrically distributed with respect to the grounding wire. This facilitates uniform electromagnetic wave radiation by the antenna device.

[0009] In one possible implementation, the three resonant operating modes are a first common-mode mode, a differential-mode mode, and a second common-mode mode. In the second common-mode mode, the local current direction sequentially passes through the feed line, the portion of the first horizontal radiating metal patch located between the feed line and the first vertical radiating metal patch, and the first vertical radiating metal patch. The total length of the feed line, the portion of the first horizontal radiating metal patch located between the feed line and the first vertical radiating metal patch, and the first vertical radiating metal patch is 1 / 4 of the resonant wavelength of the second common-mode mode. This ensures that the resonant circuit formed between the feed line, the antenna patch, and the ground plane can operate in the frequency band corresponding to the second common-mode mode, improving radiation performance.

[0010] In one possible implementation, a dielectric block is further included, which is connected to the floor. The antenna patch, the feed line, and the ground line are all attached to the dielectric block. By attaching the antenna device to the dielectric block, the antenna device forms an on-board antenna with no clearance, thereby saving space on the floor and facilitating the placement of more components.

[0011] In one possible implementation, the antenna patch includes a second horizontally radiating metal patch, a third vertically radiating metal patch, and a fourth vertically radiating metal patch. The third and fourth vertically radiating metal patches are respectively vertically connected to both ends of the second horizontally radiating metal patch. All three patches are attached to the top surface of the dielectric block. The feed wire and the ground wire are attached to the sidewall of the dielectric block adjacent to the top surface, and the ends of the feed wire and the ground wire facing away from the floor are connected to the second horizontally radiating metal patch. Therefore, the antenna device with this structure does not require a clearance area above the floor, thus saving floor space. Furthermore, attaching the antenna device to the dielectric block provides a larger radiating surface and ensures the stability of the antenna device.

[0012] In one possible implementation, the length of the third vertically radiating metal patch is shorter than the length of the fourth vertically radiating metal patch. This facilitates the excitation of three different resonances, thereby widening the low-frequency bandwidth of the antenna device.

[0013] In one possible implementation, the grounding wire is connected at a position offset by a first distance from the center of the second horizontal radiating metal patch toward the third vertical radiating metal patch. This facilitates the excitation of three different resonances, thereby widening the low-frequency bandwidth of the antenna device.

[0014] In one possible implementation, the first distance is 3 mm.

[0015] In one possible implementation, a predetermined second distance is maintained between the feed line and the ground line. This distance allows the three resonants excited by the antenna device to cover the range of 698MHz-1500MHz.

[0016] In one possible implementation, the second distance is 6.5 mm to 8 mm.

[0017] In one possible implementation, the low-frequency bandwidth covers a frequency band of 698MHz-1500MHz.

[0018] A second aspect of this application also provides a terminal device, which includes the antenna device described in the first aspect of this application.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0020] Figure 1This is a schematic diagram showing the antenna device connected to the floor according to one embodiment of this application;

[0021] Figure 2 for Figure 1 A magnified view of the antenna device's location;

[0022] Figure 3 A simulation S11 curve of an antenna device provided in one embodiment of this application;

[0023] Figure 4 An efficiency curve of an antenna device provided in one embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the current distribution of an antenna device in a first common-mode according to an embodiment of this application;

[0025] Figure 6 A schematic diagram of the current distribution of an antenna device in differential mode according to an embodiment of this application;

[0026] Figure 7 This is a schematic diagram of the current distribution of an antenna device in a second common-mode according to an embodiment of this application;

[0027] Figure 8 A schematic diagram showing the antenna device connected to the floor according to another embodiment of this application;

[0028] Figure 9 A side view of an antenna device connected to a floor, according to another embodiment of this application;

[0029] Figure 10 A top view of an antenna device connected to a floor, according to another embodiment of this application;

[0030] Figure 11 A simulation S11 curve of an antenna device provided in another embodiment of this application;

[0031] Figure 12 An efficiency curve of an antenna device provided in another embodiment of this application is shown below. Figure 12 As shown;

[0032] Figure 13 A schematic diagram of the current distribution of an antenna device in a first common-mode according to another embodiment of this application;

[0033] Figure 14 A schematic diagram of the current distribution of an antenna device in differential mode, provided in another embodiment of this application;

[0034] Figure 15 A schematic diagram of the current distribution of an antenna device in a second common-mode mode, provided in another embodiment of this application.

[0035] Figure label:

[0036] 1-Antenna patch;

[0037] 11-First level radiating metal patch;

[0038] 12-First vertically radiating metal patch;

[0039] 13-Second vertical radiation metal patch;

[0040] 14-Second-level radiating metal patch;

[0041] 15-Third vertical radiating metal patch;

[0042] 16-Fourth vertical radiation metal patch;

[0043] 2-Feeder line;

[0044] 3-Grounding wire;

[0045] 4-Floor;

[0046] 5-Capacitor;

[0047] 6-Media block;

[0048] 61-Top surface;

[0049] 62 - Side wall surface;

[0050] 7-Feed point.

[0051] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0053] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0055] Antennas are common devices for transmitting and receiving wireless signals, often integrated into various terminal devices such as mobile phones, tablets, e-readers, and speakers. As the demand for portability in terminal devices increases, the frequency bands that antennas need to integrate are also expanding. However, for low frequencies, due to the longer wavelengths, widening the bandwidth requires increasing the overall size of the antenna, which is difficult to implement in smaller terminal devices, resulting in significant limitations in low-frequency bandwidth expansion. Furthermore, while existing technologies use antenna switches to change the antenna's operating state to cover low-frequency bandwidth, these applications are costly.

[0056] Therefore, this application provides an antenna device. Figure 1 This is a schematic diagram showing the antenna device provided in one embodiment of this application connected to the floor. Figure 2 for Figure 1 A magnified view of the antenna device location, as shown in the image. Figure 1 and Figure 2 As shown, it includes an antenna patch 1, a feed line 2, a capacitor 5, and a ground line 3. One end of the feed line 2 is connected to the antenna patch 1 to power the antenna patch 1, and the other end of the feed line 2 is connected in series with the capacitor 5. The capacitor 5 is connected to the feed point 7 of the ground plane 4. One end of the ground line 3 is connected to the antenna patch 1, and the other end of the ground line 3 is used to connect to the ground plane 4. There is a gap between the antenna patch 1 and the ground plane 4. The combined action of the antenna patch 1, the feed line 2, and the ground line 3 excites three resonant operating modes, increasing the low-frequency bandwidth of the antenna device.

[0057] This antenna device, through the combined action of antenna patch 1, feed line 2, capacitor 5, and ground wire 3, forms three resonant circuits with the ground plane 4, thus exciting three resonant operating modes. This broadens the low-frequency bandwidth of the antenna device, covering a frequency band of 698MHz-1500MHz, allowing it to operate in frequency bands such as B12, B17, B5, B8, and B11, all with good radiation performance. This antenna device can be applied to automotive terminal equipment or other types of terminal equipment to realize cellular communication antennas, which typically need to support 698MHz-960MHz in the low-frequency range. Therefore, this antenna can achieve a large low-frequency bandwidth without any additional components such as antenna switches, while simultaneously simplifying the structure and size of the antenna device to meet miniaturization design requirements, while maintaining good radiation performance.

[0058] Among them, such as Figure 1 and Figure 2 As shown, the capacitance value in this embodiment is 1.5pF. This capacitor 5 can enable the antenna to form three resonant circuits, thereby widening the bandwidth and allowing the antenna to achieve better port matching in the required specific frequency band. This eliminates the need to design a complex antenna shape to change the resonant frequency, which helps to simplify the shape of the antenna.

[0059] Specifically, the ground plane 4 can be a PCB ground plane 4, which has a clearance area near its edge. The clearance area refers to the area covered by non-conductive material, and its size is sufficient to accommodate the antenna device. The shape of the PCB ground plane 4 can be rectangular, square, or polygonal, etc., and the shape of the clearance area can also be rectangular, square, or polygonal, etc., which is not limited in this embodiment. The antenna device is disposed in the clearance area, forming an off-board antenna device.

[0060] As a specific implementation method, such as Figure 1 and Figure 2 As shown, the antenna patch 1 includes a first horizontal radiating metal patch 11, a first vertical radiating metal patch 12, and a second vertical radiating metal patch 13. The first vertical radiating metal patch 12 and the second vertical radiating metal patch 13 are respectively vertically connected to the two ends of the first horizontal radiating metal patch 11, and the first vertical radiating metal patch 12 and the second vertical radiating metal patch 13 extend towards the floor 4. The feed wire 2 and the ground wire 3 are both connected to the first horizontal radiating metal patch 11 at the ends away from the floor 4. The feed wire 2 is disposed between the ground wire 3 and the first vertical radiating metal patch 12.

[0061] Specifically, the first horizontal radiating metal patch 11, the first vertical radiating metal patch 12, and the second vertical radiating metal patch 13 are all thin sheet structures of good metallic conductors, such as steel sheets or copper sheets. These patches can radiate electromagnetic wave signals. The first horizontal radiating metal patch 11 extends parallel to the floor 4, while the first vertical radiating metal patch 12 and the second vertical radiating metal patch 13 are perpendicular to the first horizontal radiating metal patch 11 and extend towards the floor 4, maintaining a certain distance from it. Thus, the first horizontal radiating metal patch 11, the first vertical radiating metal patch 12, and the second vertical radiating metal patch 13 form a T-shaped box structure with an opening on one side, which allows the antenna to have good radiation performance and also helps to broaden the low-frequency bandwidth.

[0062] The first vertical radiating metal patch 12 and the second vertical radiating metal patch 13 can be welded to the first horizontal radiating metal patch 11. Of course, the first horizontal radiating metal patch 11, the first vertical radiating metal patch 12 and the second vertical radiating metal patch 13 can also be an integrally formed structure.

[0063] In one specific implementation, the ground wire 3 is connected to the center of the first horizontal radiating metal patch 11, and the first vertical radiating metal patch 12 and the second vertical radiating metal patch 13 are symmetrically distributed with respect to the ground wire 3. The ground wire 3 is connected at the halfway point along the length of the first horizontal radiating metal patch 11, which facilitates uniform electromagnetic wave radiation by the antenna device.

[0064] In this embodiment, the length of the first horizontal radiating metal patch 11 is 83mm, the distance between it and the ground 4 is 18mm, the width of the grounding wire 3 is 3mm, and the width of the feed wire 2 is 3mm. A preset second distance is maintained between the feed wire 2 and the grounding wire 3. Specifically, this second distance can be 6.5mm to 8mm. In this embodiment, the 8mm distance between the feed wire 2 and the grounding wire 3 allows the three resonants excited by the antenna device to cover 698MHz-1500MHz.

[0065] Of course, the dimensions of the antenna patch 1, the feed line 2, and the grounding line 3 can also be adjusted adaptively, thereby adjusting the resonant frequency of the antenna device to make it suitable for different application scenarios.

[0066] Figure 3 This is a simulation curve of S11 for an antenna device provided in one embodiment of this application, where S11 represents the input return loss. Figure 3As shown, the antenna device excites three resonators, covering a low-frequency bandwidth of 698MHz-1500MHz. Specifically, the return loss is -8.3233dB at 698MHz and -5.498dB at 1500MHz. Therefore, the antenna device exhibits low return loss and good radiation performance within the low-frequency bandwidth of 698MHz-1500MHz. Figure 4 An efficiency curve of an antenna device provided in one embodiment of this application is shown below. Figure 4 As shown, the antenna device has good radiation performance in the 698MHz-1500MHz frequency band.

[0067] In this embodiment, the three resonant modes are the first common-mode mode, the differential-mode mode, and the second common-mode mode, respectively. Figure 5 This is a schematic diagram of the current distribution of an antenna device provided in an embodiment of this application in a first common-mode mode. Figure 6 This is a schematic diagram of the current distribution of an antenna device in differential mode according to an embodiment of this application. Figure 7 This is a schematic diagram of the current distribution of an antenna device provided in an embodiment of this application in a second common-mode mode, as shown below. Figures 5 to 7 As shown, three different resonant circuits are formed between the antenna patch 1, the feed line 2, the ground line 3, and the ground plane 4. The three resonant circuits cover different low-frequency bands, thereby enabling the antenna device to obtain a large low-frequency bandwidth.

[0068] It should be noted that, as Figure 7 As shown, the local current direction in the second common-mode passes sequentially through the feed line 2, the portion of the first horizontal radiating metal patch 11 located between the feed line 2 and the first vertical radiating metal patch 12, and the first vertical radiating metal patch. The total length of the feed line 2, the portion of the first horizontal radiating metal patch 11 located between the feed line 2 and the first vertical radiating metal patch 12, and the first vertical radiating metal patch is 1 / 4 of the resonant wavelength of the second common-mode. Therefore, it can be ensured that the resonant circuit formed between the feed line 2, the antenna patch 1, and the ground plane 4 can operate in the frequency band corresponding to the second common-mode, thereby improving radiation performance.

[0069] In another specific implementation method Figure 8 This is a schematic diagram showing the antenna device connected to the floor according to another embodiment of this application. Figure 9 A side view of an antenna device connected to a floor, according to another embodiment of this application. Figure 10 A top view of an antenna device connected to a floor, as provided in another embodiment of this application, as shown. Figures 8 to 10As shown, the antenna device includes an antenna patch 1, a feed line 2, a ground line 3, and a dielectric block 6. The dielectric block 6 is connected to a ground plane 4, and the antenna patch 1, feed line 2, and ground line 3 are all attached to the dielectric block 6. The dielectric block 6 and the ground plane 4 can be made of the same material, such as ceramic, epoxy resin, polytetrafluoroethylene, FR-4 composite material, or F4B composite material.

[0070] The antenna device is attached to the dielectric block 6, forming an on-board antenna with no clearance, thus saving space on the floor 4 and allowing for the placement of more components. The antenna device can be positioned near a corner of the floor 4 to avoid obstruction by other components, resulting in better radiation performance.

[0071] Among them, such as Figure 8 and Figure 9 As shown, the capacitance value in this embodiment is 1.3pF. This capacitor 5 can enable the antenna to form three resonant circuits, thereby widening the bandwidth and allowing the antenna to achieve better port matching in the required specific frequency band. This eliminates the need to design a complex antenna shape to change the resonant frequency, which helps to simplify the shape of the antenna.

[0072] Specifically, such as Figures 8 to 10 As shown, the antenna patch 1 includes a second horizontal radiating metal patch 14, a third vertical radiating metal patch 15, and a fourth vertical radiating metal patch 16. The third vertical radiating metal patch 15 and the fourth vertical radiating metal patch 16 are respectively vertically connected to the two ends of the second horizontal radiating metal patch 14. The second horizontal radiating metal patch 14, the third vertical radiating metal patch 15, and the fourth vertical radiating metal patch 16 are all attached to the top surface 61 of the dielectric block 6. The feed wire 2 and the ground wire 3 are both attached to the side wall surface 62 of the dielectric block 6 adjacent to the top surface 61. The ends of the feed wire 2 and the ground wire 3 away from the ground floor 4 are both connected to the second horizontal radiating metal patch 14.

[0073] The dielectric block 6 can be a regular cube such as a cuboid or cube, or it can be an irregular cube. In this embodiment, the dielectric block 6 is preferably a cuboid. The top surface 61 of the dielectric block 6 is the surface facing away from the floor 4 and is parallel to the floor 4. The bottom surface of the dielectric block 6 is connected to the floor 4. The dielectric block 6 has four side walls 62 around it. The second horizontal radiating metal patch 14, the third vertical radiating metal patch 15, and the fourth vertical radiating metal patch 16 are all attached to the top surface 61 of the dielectric block 6. The feed wire 2 and the connecting wire are preferably attached to the side wall 62 of the dielectric block 6 facing the outside of the floor 4, which is beneficial for radiating electromagnetic waves to the outside.

[0074] The antenna device provided in this embodiment does not require a clearance area above the floor 4, thus saving space above the floor 4. In addition, attaching the antenna device to the dielectric block 6 gives the antenna a larger radiation surface and also ensures the stability of the antenna device.

[0075] Specifically, such as Figure 10 As shown, the length of the third vertical radiating metal patch 15 is less than the length of the fourth vertical radiating metal patch 16. This facilitates the excitation of three different resonances, thereby broadening the low-frequency bandwidth of the antenna device.

[0076] Specifically, the grounding wire 3 is connected at a position offset by a first distance from the center of the second horizontal radiating metal patch 14 toward the third vertical radiating metal patch 15. Since the length of the third vertical radiating metal patch 15 is less than the length of the fourth vertical radiating metal patch 16, the antenna device is not a symmetrical structure. The position of the grounding wire 3, biased toward the shorter third vertical radiating metal patch 15, facilitates the excitation of three different resonances, thereby broadening the low-frequency bandwidth of the antenna device.

[0077] The first distance mentioned above can be 3mm. In this embodiment, the length of the second horizontal radiating metal patch 14 is 93mm, the distance between it and the ground 4 is 18.03mm, the width of the grounding wire 3 is 6mm, and the width of the feed wire 2 is 3mm. A preset second distance is maintained between the feed wire 2 and the grounding wire 3. Specifically, this second distance can be 6.5mm to 8mm. In this embodiment, the 6.5mm distance between the feed wire 2 and the grounding wire 3 allows the three resonants excited by the antenna device to cover 698MHz-1500MHz.

[0078] Of course, the dimensions of the antenna patch 1, feed line 2, and grounding line 3 can also be adjusted adaptively, thereby adjusting the resonant frequency of the antenna device and controlling the bandwidth of the antenna to make it suitable for different application scenarios.

[0079] Figure 11 The image shows a simulation curve of S11 for an antenna device provided in another embodiment of this application, where S11 represents the input return loss. Figure 11 As shown, the antenna device excites three resonators, covering a low-frequency bandwidth of 698MHz-1500MHz. Specifically, the return loss is -4.4188dB at 698MHz and -3.7739dB at 1500MHz. Therefore, the antenna device exhibits low return loss and good radiation performance within the low-frequency bandwidth of 698MHz-1500MHz. Figure 12 An efficiency curve of an antenna device provided in another embodiment of this application is shown below. Figure 12As shown, the antenna device has good radiation performance in the 698MHz-1500MHz frequency band.

[0080] In this embodiment, the three resonant modes are the first common-mode mode, the differential-mode mode, and the second common-mode mode, respectively. Figure 13 This is a schematic diagram of the current distribution of an antenna device in a first common-mode, according to another embodiment of this application. Figure 14 This is a schematic diagram of the current distribution of an antenna device in differential mode according to another embodiment of this application. Figure 15 This is a schematic diagram of the current distribution of an antenna device in a second common-mode according to another embodiment of this application, wherein... Figures 13 to 15 This is a schematic diagram of the antenna device in its deployed state to show the overall current distribution. (Example) Figures 13 to 15 As shown, three different resonant circuits are formed between the antenna patch 1, the feed line 2, the ground line 3, and the ground plane 4. The three resonant circuits cover different low-frequency bands, thereby enabling the antenna device to obtain a large low-frequency bandwidth.

[0081] This application also provides a terminal device, which includes the antenna device provided in any embodiment of this application. The terminal device can be a handheld device, vehicle-mounted device, etc., with wireless connectivity. Common terminals include, for example, mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), and wearable devices such as smartwatches, smart bracelets, and pedometers.

[0082] The terminal device provided in this application embodiment can greatly broaden the low-frequency bandwidth and improve the radiation performance of the antenna device by using three resonant modes excited by the antenna device.

[0083] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An antenna device, characterized in that, The device includes an antenna patch, a feed line, a capacitor, and a ground wire. One end of the feed line is connected to the antenna patch to power it, and the other end is connected in series with the capacitor, which is connected to the power supply point of the ground plane. One end of the ground wire is connected to the antenna patch, and the other end is connected to the ground plane. There is a gap between the antenna patch and the ground plane. The combined action of the antenna patch, the feed line, the capacitor, and the ground wire excites three resonant operating modes, which cover a frequency band of 698MHz-1500MHz. The antenna device further includes a dielectric block connected to the ground plane, and the antenna patch, the feed line, and the grounding line are all attached to the dielectric block; The antenna patch includes a second horizontal radiating metal patch, a third vertical radiating metal patch, and a fourth vertical radiating metal patch. The third and fourth vertical radiating metal patches are respectively vertically connected to both ends of the second horizontal radiating metal patch. The second, third, and fourth vertical radiating metal patches are all attached to the top surface of the dielectric block. The feed wire and the ground wire are both attached to the side wall of the dielectric block adjacent to the top surface. The ends of the feed wire and the ground wire away from the ground plane are both connected to the second horizontal radiating metal patch.

2. The antenna device according to claim 1, characterized in that, The antenna patch includes a first horizontal radiating metal patch, a first vertical radiating metal patch, and a second vertical radiating metal patch. The first vertical radiating metal patch and the second vertical radiating metal patch are respectively vertically connected to the two ends of the first horizontal radiating metal patch, and the first vertical radiating metal patch and the second vertical radiating metal patch extend toward the floor. The ends of the feed line and the grounding line away from the floor are both connected to the first horizontal radiating metal patch, and the feed line is disposed between the grounding line and the first vertical radiating metal patch.

3. The antenna device according to claim 2, characterized in that, The grounding wire is connected to the center of the first horizontal radiating metal patch, and the first vertical radiating metal patch and the second vertical radiating metal patch are symmetrically distributed with respect to the grounding wire.

4. The antenna device according to claim 2, characterized in that, The three resonant operating modes are the first common-mode mode, the differential-mode mode, and the second common-mode mode. In the second common-mode mode, the local current direction passes sequentially through the feed line, the portion of the first horizontal radiating metal patch located between the feed line and the first vertical radiating metal patch, and the first vertical radiating metal patch. The total length of the feed line, the portion of the first horizontal radiating metal patch located between the feed line and the first vertical radiating metal patch, and the first vertical radiating metal patch is 1 / 4 of the resonant wavelength of the second common-mode mode.

5. The antenna device according to claim 1, characterized in that, The three resonant operating modes are a first common-mode mode, a differential-mode mode, and a second common-mode mode. In the second common-mode mode, the local current direction passes sequentially through the feed line, the portion of the second horizontal radiating metal patch located between the feed line and the third vertical radiating metal patch, and the third vertical radiating metal patch. The total length of the feed line, the portion of the second horizontal radiating metal patch located between the feed line and the third vertical radiating metal patch, and the third vertical radiating metal patch is 1 / 4 of the resonant wavelength of the second common-mode mode.

6. The antenna device according to claim 1, characterized in that, The length of the third vertically radiating metal patch is less than the length of the fourth vertically radiating metal patch.

7. The antenna device according to claim 1, characterized in that, The grounding wire is connected at a position offset by a first distance from the center of the second horizontal radiating metal patch toward the third vertical radiating metal patch.

8. The antenna device according to claim 7, characterized in that, The first distance is 3mm.

9. The antenna device according to any one of claims 1-8, characterized in that, There is a preset second distance between the feeder wire and the grounding wire.

10. The antenna device according to claim 9, characterized in that, The second distance is 6.5mm to 8mm.

11. A terminal device, characterized in that, Includes the antenna device according to any one of claims 1-10.

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