Terminal antenna and terminal device

Abstract

The utility model discloses a terminal antenna and terminal equipment, and belongs to the technical field of communication. The terminal antenna comprises a radiation body, a feed terminal and a plurality of grounding terminals, wherein the feed terminal and the grounding terminals are connected with the radiation body. The radiation body comprises a first radiation unit, a second radiation unit and a third radiation unit, the first radiation unit and the second radiation unit are both of strip-shaped structures and are both located on the same side of the third radiation unit, and the first end of the first radiation unit and the first end of the second radiation unit are both connected with the third radiation unit; the feed terminal and the plurality of grounding terminals are located on one side, far away from the second radiation unit, of the first radiation unit, the plurality of grounding terminals are located on the same side of the feed terminal, and the feed terminal and the plurality of grounding terminals are distributed at intervals in the direction close to the third radiation unit and are connected with the first radiation unit. Through the connection of the radiation units, the size of the antenna can be reduced, so that the antenna has multiple different working frequency bands, and the radiation efficiency is improved.

Description

Technical Field

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

[0002] Today's smart devices (such as smartphones) are highly integrated, and devices such as cameras, receivers, and light sensors are stacked around the antenna, resulting in less and less space available for the antenna. At the same time, in order to adapt to different usage scenarios, the antenna in the smart device needs to have multiple working frequency bands and high radiation efficiency. Therefore, how to reduce the size of the antenna and ensure that the antenna has multiple working frequency bands and high radiation efficiency in a limited space is an urgent problem to be solved. Utility Model Content

[0003] In order to reduce the size of the antenna and enable the antenna to have multiple operating frequency bands and higher radiation efficiency in a limited space, the present application provides a terminal antenna and a terminal device. The technical solution is as follows:

[0004] In one aspect, the present application provides a terminal antenna, comprising a radiating body, and a feeding terminal and a plurality of grounding terminals connected to the radiating body;

[0005] The radiation body comprises a first radiation unit, a second radiation unit and a third radiation unit, the first radiation unit and the second radiation unit are both in a strip structure and are both located on the same side of the third radiation unit, and the first end of the first radiation unit and the first end of the second radiation unit are both connected to the third radiation unit;

[0006] The feeding terminal and the multiple grounding terminals are both located on a side of the first radiating unit away from the second radiating unit, and the multiple grounding terminals are located on the same side of the feeding terminal. The feeding terminal and the multiple grounding terminals are spaced apart in a direction close to the third radiating unit, and are both connected to the first radiating unit.

[0007] Optionally, the first radiation unit has a first slot running through it;

[0008] The first slot is located on a side of the first grounding terminal away from the feeding terminal, the first end of the first slot is close to the first grounding terminal and extends to the edge of the first radiation unit, the second end of the first slot is away from the first grounding terminal, and the first grounding terminal is the one farthest from the feeding terminal among the multiple grounding terminals.

[0009] Optionally, the first slot is L-shaped.

[0010] Optionally, the first radiation unit has a second slot running through it;

[0011] The first end of the second slot is located at a side of the feeding terminal away from the third radiation unit and extends to an edge of the first radiation unit, and the second end of the second slot is located at a side of the feeding terminal close to the third radiation unit;

[0012] The radiation body further includes a fourth radiation unit, which is located on a side of the first radiation unit away from the second radiation unit and connected to the second end of the first radiation unit.

[0013] Optionally, the radiation body further includes a fifth radiation unit;

[0014] The fifth radiation unit is located on a side of the second radiation unit close to the first radiation unit and on a side of the fourth radiation unit away from the third radiation unit. The fifth radiation unit is connected to the second end of the second radiation unit.

[0015] Optionally, the second end of the second slot is located on a side of the second grounding terminal close to the third radiation unit, and the second grounding terminal is one of the multiple grounding terminals closest to the feeding terminal.

[0016] Optionally, the second slot is L-shaped, and an end of a short side of the second slot forms a first end of the second slot.

[0017] Optionally, the first radiation unit includes a first radiation branch and a second radiation branch distributed in sequence in a direction close to the third radiation unit;

[0018] The second radiation unit includes a third radiation branch and a fourth radiation branch sequentially distributed in a direction close to the third radiation unit;

[0019] The distance between the first radiation branch and the third radiation branch is smaller than the distance between the second radiation branch and the fourth radiation branch, and the distance between the first radiation branch and the third radiation branch, and the distance between the second radiation branch and the fourth radiation branch are both within a target distance range, which refers to a distance range that can produce resonance.

[0020] Optionally, the target distance range refers to a range of not less than 0.3 mm and not more than 1.5 mm.

[0021] On the other hand, the present application also provides a terminal device, which includes the terminal antenna.

[0022] The technical solution provided by this application can at least bring the following beneficial effects:

[0023] Since multiple grounding terminals are located on the same side of the feeding terminal, and the feeding terminal and the multiple grounding terminals are spaced apart in the direction close to the third radiation unit, the path length through which the current flows can be different by switching the grounding terminal, so that the terminal antenna has a variety of different selectable equivalent lengths, and the terminal antenna can operate in a variety of different frequency bands, meeting the application of the terminal antenna in a variety of scenarios. By connecting the first radiation unit, the second radiation unit, and the third radiation unit, the terminal antenna is roughly "U" shaped as a whole, so that under the same operating frequency requirements, the terminal antenna can reduce the space occupied by the antenna and meet the needs of more smart device designs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the structure of a terminal antenna provided in an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a terminal antenna provided by an embodiment of the present application and further including a first slot;

[0026] Figure 3 is a schematic structural diagram of a terminal antenna provided by an embodiment of the present application, which further includes a second slot and a fourth radiation unit;

[0027] Figure 4 is a schematic structural diagram of a terminal antenna provided by an embodiment of the present application and further including a fifth radiation unit;

[0028] Figure 5 It is a schematic diagram of the structure of a terminal antenna provided in an embodiment of the present application, which can also excite frequency doubling through coupling of radiation branches;

[0029] Figure 6 It is a schematic diagram of the structure of a terminal antenna provided in an embodiment of the present application and capable of realizing all the functions described in the embodiments of the present application;

[0030] Figure 7 This is a method provided by the embodiment of the present application. Figure 6 Return loss diagram of the terminal antenna in;

[0031] Figure 8 Another embodiment of the present application provides Figure 6 Return loss diagram of the terminal antenna in;

[0032] Fig. 9 This is another embodiment provided by the present application. Figure 6 Return loss diagram of the terminal antenna in;

[0033] Fig.10 It is a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0035] Please refer to Figure 1 , Figure 1 It is a structural schematic diagram of a terminal antenna provided in an embodiment of the present application, wherein the terminal antenna includes a radiating body 1, and a feed terminal 2 and a plurality of ground terminals 3 connected to the radiating body 1; the radiating body 1 includes a first radiating unit 11, a second radiating unit 12 and a third radiating unit 13, the first radiating unit 11 and the second radiating unit 12 are both strip-shaped structures, and are both located on the same side of the third radiating unit 13, and the first end 111 of the first radiating unit 11 and the first end 121 of the second radiating unit 12 are both connected to the third radiating unit 13; the feed terminal 2 and the plurality of ground terminals 3 are both located on a side of the first radiating unit 11 away from the second radiating unit 12, and the plurality of ground terminals 3 are located on the same side of the feed terminal 2, the feed terminal 2 and the plurality of ground terminals 3 are spaced apart in a direction close to the third radiating unit 13, and are both connected to the first radiating unit 11.

[0036] The feed terminal 2 is used to connect to the transmitting port of the transmitting component and the interface port of the receiving component included in the PCB (Printed Circuit Board) mainboard in the terminal device, and the multiple grounding terminals 3 are used to connect to the ground terminal in the terminal device. The connection method can be through a microstrip line connection, or through a spring connection, etc., which is not limited in the embodiment of the present application.

[0037] Normally, the best operating frequency of an antenna matches the equivalent length of the antenna. Generally speaking, the equivalent length of an antenna is often 1 / 4 or 5 / 8 of the signal wavelength corresponding to the best operating frequency of the antenna. The equivalent length of an antenna is the path length of the current on the radiating body from the feed terminal to the ground terminal when the antenna is working. In the embodiment of the present application, since the terminal antenna includes multiple ground terminals, the current has multiple paths from the feed terminal to the multiple ground terminals, that is, the terminal antenna has multiple equivalent lengths, and different equivalent lengths correspond to different best operating frequencies.

[0038] For example, please refer to Figure 1, when the terminal antenna includes a first grounding terminal 31 and a second grounding terminal 32, the current has two paths. The path a of the current from the feed terminal 2 to the first grounding terminal 31 is: the current starts from the feed terminal, passes through the first radiation unit and the third radiation unit in sequence, then flows to the second radiation unit, and then passes through the second radiation unit and the third radiation unit in sequence to flow back to the first grounding terminal. The path b of the current from the feed terminal 2 to the second grounding terminal 32 is: the current starts from the feed terminal, passes through the first radiation unit and the third radiation unit in sequence, then flows to the second radiation unit, and then passes through the second radiation unit and the third radiation unit in sequence to flow back to the second grounding terminal. It can be seen that when different grounding terminals are used to connect to the grounding terminal on the PCB mainboard, the length of the path through which the current flows is different, and thus the equivalent length of the terminal antenna is different, and the corresponding optimal operating frequency is also different.

[0039] Normally, the best operating frequency of an antenna is the center frequency of the antenna's operating frequency band. In the embodiment of the present application, since the multiple grounding terminals are located on the same side of the feeding terminal, and the feeding terminal and the multiple grounding terminals are spaced apart in the direction close to the third radiation unit, the path length of the current can be ensured to be different by switching the grounding terminals, so that the terminal antenna corresponds to multiple different equivalent lengths, and then corresponds to multiple different best operating frequencies, so that the terminal antenna can operate in multiple different frequency bands, satisfying the application of the terminal antenna in a variety of scenarios.

[0040] For example, Figure 1 As shown, when the terminal antenna includes the first grounding terminal 31 and the second grounding terminal 32, the terminal antenna can operate in two frequency bands. The center frequency of one frequency band corresponds to the antenna equivalent length of the length of the above path a, and the center frequency of the other frequency band corresponds to the antenna equivalent length of the length of the above path b.

[0041] In some embodiments, a switch may be connected between the multiple ground terminals, and the switching of the multiple ground terminals can be achieved by controlling the on or off of the switch.

[0042] Since the terminal antenna is connected through multiple radiation units, the overall shape is roughly "U", and the feed terminal and the ground terminal are located on the same side of the "U", so that the equivalent length of the terminal antenna is roughly twice the length of the "U". Compared with a single long strip antenna, when the terminal antenna has the same operating frequency band as the single long strip antenna, the terminal antenna occupies a smaller space. In other words, under the requirement of having the same operating frequency band, the terminal antenna can not only reduce the space occupied by the antenna, but also work in different frequency bands, meeting the application of the terminal antenna in a variety of scenarios.

[0043] In some embodiments, the distance (or gap width) between the first radiation unit and the second radiation unit is within a first distance range, and the first distance range refers to a distance range in which the first radiation unit and the second radiation unit can be coupled. In this way, coupling can be generated between the first radiation unit and the second radiation unit, so that the current intensity on the first radiation unit and the second radiation unit is stronger, which can improve the radiation efficiency of the terminal antenna.

[0044] In some embodiments, the length of the gap between the first radiation unit and the second radiation unit can be adjusted by adjusting the length of the first radiation unit and the second radiation unit, thereby adjusting the current coupling strength between the first radiation unit and the second radiation unit. Similarly, the width of the gap between the first radiation unit and the second radiation unit can be adjusted by adjusting the length of the third radiation unit, thereby adjusting the current coupling strength between the first radiation unit and the second radiation unit. Generally speaking, the longer the gap length and the smaller the gap width, the stronger the coupling strength.

[0045] In other embodiments, when the terminal antenna is working, there is also current on the PCB mainboard, so the distance between the first radiation unit and the PCB mainboard can also be within the first distance range. In this way, coupling can also be generated between the first radiation unit and the PCB mainboard, thereby increasing the intensity of the current on the first radiation unit, thereby improving the radiation efficiency of the terminal antenna.

[0046] From the above content, it can be seen that the operating frequency of the antenna is related to the equivalent length of the antenna, and the radiation efficiency of the antenna is related to the current intensity on the radiation body. The embodiment of the present application does not impose specific restrictions on the length and width of the first radiation unit, the second radiation unit and the third radiation unit. In actual applications, the length and width of the first radiation unit, the second radiation unit and the third radiation unit can be determined according to design requirements.

[0047] Please refer to Figure 2 In some embodiments, the first radiation unit 11 has a first slot K1 that penetrates through the first radiation unit 11; the first slot K1 is located on a side of the first grounding terminal 31 away from the feeding terminal 2, a first end K11 of the first slot K1 is close to the first grounding terminal 31 and extends to the edge of the first radiation unit 11, and a second end K12 of the first slot K1 is far away from the first grounding terminal 31, and the first grounding terminal 31 is the one farthest from the feeding terminal 2 among the multiple grounding terminals. Optionally, the first slot K1 is L-shaped.

[0048] When the first radiation unit has a first slot, after the current flows out from the feed terminal, it can flow around the first slot to the third radiation unit and the second radiation unit in sequence, and when it flows back to the ground terminal through the second radiation unit and the third radiation unit in sequence, it can also flow around the first slot to the ground terminal. In this way, the current path can be guaranteed to be longer, and the equivalent length of the terminal antenna is also longer, which can further reduce the space occupied by the terminal antenna. In other words, the equivalent length of the antenna can be increased by the first slot. Under the requirements of the same working frequency band, the first slot can make the terminal antenna have a smaller size, reduce the space occupied by the antenna, and meet the design requirements of more smart devices.

[0049] Of course, there may be a situation where the path through which the current flows does not surround the first slot, that is, there may be a situation where the current surrounds the first slot and does not surround the first slot at the same time. In other words, the first slot actually also allows the terminal antenna to have more selectable different equivalent lengths, so that the terminal antenna can work in more different frequency bands, meeting the application of the terminal antenna in a variety of scenarios.

[0050] For example, Figure 2 As shown, the terminal antenna includes a first grounding terminal 31 and a second grounding terminal 32, the first grounding terminal 31 has a first slot K1, and the current has multiple paths. The multiple paths include not only the above-mentioned path a and path b, but also path c and path d. Path c is: the current starts from the feeding terminal, passes through the first radiating element and surrounds the first slot, then flows to the third radiating element and the second radiating element in sequence, then passes through the second radiating element and the third radiating element in sequence to flow to the first radiating element, and flows to the first grounding terminal after surrounding the first slot; path d is: the current starts from the feeding terminal, passes through the first radiating element and surrounds the first slot, then flows to the third radiating element and the second radiating element in sequence, then passes through the second radiating element and the third radiating element in sequence to flow to the first radiating element, and flows to the second grounding terminal after surrounding the first slot. That is to say, path a and path b do not surround the first slot, and path c and path d surround the first slot. For example, the length of path b is the equivalent length of the antenna corresponding to the frequency band of 824 MHz to 880 MHz, and the length of path c is the equivalent length of the antenna corresponding to the frequency band of 880 MHz to 960 MHz.

[0051] Please refer to Figure 3In some embodiments, the first radiation unit 11 has a second slot K2 that penetrates therethrough; the first end K21 of the second slot K2 is located on the side of the feed terminal 2 away from the third radiation unit 13, and extends to the edge of the first radiation unit 11, and the second end K22 of the second slot K2 is located on the side of the feed terminal 2 close to the third radiation unit 13; the radiation body of the terminal antenna also includes a fourth radiation unit 14, which is located on the side of the first radiation unit 11 away from the second radiation unit 12, and is connected to the second end 112 of the first radiation unit 11.

[0052] In this case, the current path also includes path e and path f. Path e is: starting from the feed terminal, flowing from the first radiation unit to the fourth radiation unit after surrounding the second slot, and then flowing from the fourth radiation unit through the first radiation unit back to the first grounding terminal. Path f is: starting from the feed terminal, flowing from the first radiation unit to the fourth radiation unit after surrounding the second slot, and then flowing from the fourth radiation unit through the first radiation unit back to the second grounding terminal. That is to say, when the first radiation unit has a second slot and the radiation body also includes a fourth radiation unit, there are more paths that the current can choose, which allows the terminal antenna to have more different equivalent lengths, so that the terminal antenna can operate in more different frequency bands.

[0053] The embodiment of the present application does not specifically limit the length of the second slot. In practical applications, it is only necessary to ensure that the equivalent length corresponding to the center frequency of the desired designed working frequency band is the same as the length of path e or f.

[0054] Alternatively, if Figure 3 As shown, the second slot K2 is L-shaped, and the end of the short side of the second slot K2 forms the first end K21 of the second slot K2.

[0055] In other embodiments, the first radiation unit does not have a second slot, and the radiation body of the terminal antenna also includes a fourth radiation unit, which is located on a side of the first radiation unit away from the second radiation unit and is connected to the second end of the first radiation unit.

[0056] In this case, the current starts from the feeding terminal, can flow directly to the fourth radiating unit through the first radiating unit, and then flow back to the first grounding terminal or the second grounding terminal through the first radiating unit from the fourth radiating unit. In other words, when the radiating body also includes the fourth radiating unit, the current can choose more paths, which also makes the terminal antenna have more different equivalent lengths, so that the terminal antenna can operate in more different frequency bands.

[0057] When the radiation body includes a fourth radiation unit and the first radiation unit does not have a second slot, the current does not need to surround the second slot when it flows from the feed terminal to the fourth radiation unit and flows back from the fourth radiation unit to the ground terminal. When the radiation body includes a fourth radiation unit of the same size and the first radiation unit has a second slot, the current starts from the feed terminal and can flow to the fourth radiation unit after surrounding the second slot in the first radiation unit; when the length of the second slot is longer and the second end of the second slot is located on the side of the ground terminal close to the third radiation unit, when the current flows back from the fourth radiation unit, it can also flow from the fourth radiation unit to the first radiation unit, and then flow to the ground terminal after surrounding the second slot in the first radiation unit. In this way, the path length of the current is longer than when there is no second slot, and the equivalent length of the terminal antenna is longer. It can be seen that the second slot also has a similar effect to the first slot, that is, the equivalent length of the antenna can be increased by the second slot. Under the design requirements of the same working frequency band, the second slot can make the terminal antenna have a smaller size, reduce the space occupied by the antenna, and meet the design requirements of more smart devices.

[0058] In some embodiments, the size of the fourth radiation unit is relatively small. In this way, the size of the antenna will not be excessively increased on the basis that the radiation body already includes the first radiation unit, the second radiation unit and the third radiation unit. In the case where the size of the fourth radiation unit is relatively small, the length of the above-mentioned path e or f is shorter than that of the above-mentioned paths a, b, c, and d. Since the size of the equivalent length of the antenna is inversely proportional to the size of the corresponding operating frequency, the fourth radiation unit can usually be used to add some higher frequency operating bands to the terminal antenna, so that the terminal antenna can operate in more different frequency bands.

[0059] For example, Figure 3 As shown, the terminal antenna includes a first grounding terminal 31 and a second grounding terminal 32, the radiation body also includes a fourth radiation unit 14, and the first radiation unit 11 also has a second slot K2. In this case, the terminal antenna can also operate in two frequency bands of 1710MHz to 2300MHz and 2300MHz to 2700MHz. Among them, the equivalent length corresponding to the center frequency of the 1710MHz to 2300MHz frequency band is the length of the above path e, and the equivalent length corresponding to the center frequency of the 2300MHz to 2700MHz frequency band is the length of the above path f.

[0060] In some embodiments, Figure 3 As shown, the first radiation unit 11 has a first slot K1 and a second slot K2, and the first radiation unit 11 includes a radiation branch 101, a radiation branch 102 and a radiation branch 103. Figure 3As can be seen in the figure, the radiation branch 101, the radiation branch 102 and the radiation branch 103 are obtained by dividing the first radiation unit 11 by the first slot K1 and the second slot K2.

[0061] In some embodiments, the width of the first slot is within the first distance range. In this way, when the terminal antenna is working, coupling can be generated between the radiation branch 101 and the radiation branch 102, and the current intensity on the radiation branch 101 and the radiation branch 102 will be stronger, which can improve the radiation efficiency of the terminal antenna.

[0062] In some embodiments, the width of the second slot is within the first range. Thus, when the terminal antenna is working, coupling can be generated between the radiation branch 101 and the radiation branch 103, and the current intensity on the radiation branch 101 and the radiation branch 103 will be stronger, which can improve the radiation efficiency of the terminal antenna.

[0063] In some embodiments, the coupling strength between the radiation branches can be adjusted by adjusting the length and width of the first slot and the second slot.

[0064] In some embodiments, the first slot and the second slot are located near the feed terminal and the ground terminal. When the antenna is working, the current intensity near the feed terminal and the ground terminal is stronger than that in other parts of the radiation body, and the greater the current on the radiation branch, the stronger the coupling intensity. Therefore, when the first slot and the second slot are located near the feed terminal and the ground terminal, the current intensity on the radiation branch around the slot is stronger, so that the coupling effect is better, thereby better improving the radiation efficiency of the antenna.

[0065] In some embodiments, the distance (or gap width) between the fourth radiation unit and the second radiation unit is within the first distance range. In this way, the fourth radiation unit and the second radiation unit can be coupled, and the current intensity on the fourth radiation unit and the second radiation unit will be stronger, which can improve the radiation efficiency of the terminal antenna.

[0066] In some embodiments, the gap length between the first radiation unit and the second radiation unit may be adjusted by adjusting the lateral lengths of the fourth radiation unit and the second radiation unit, thereby adjusting the current coupling strength on the fourth radiation unit and the second radiation unit.

[0067] In other embodiments, when the terminal antenna is working, there is also current on the PCB mainboard, and the distance between the fourth radiation unit and the PCB mainboard is also within the first distance range. In this way, coupling can also be generated between the fourth radiation unit and the PCB mainboard, thereby increasing the intensity of the current on the fourth radiation unit, thereby improving the radiation efficiency of the terminal antenna.

[0068] The embodiment of the present application does not impose any specific restrictions on the shapes and sizes of the first slot, the second slot and the fourth radiation unit. In practical applications, the shapes and sizes of the first slot, the second slot and the fourth radiation unit can be determined according to design requirements.

[0069] Please refer to Figure 4 In some embodiments, the radiating body of the terminal antenna also includes a fifth radiating unit 15; the fifth radiating unit 15 is located on a side of the second radiating unit 12 close to the first radiating unit 11, and is located on a side of the fourth radiating unit 14 away from the third radiating unit 13, and the fifth radiating unit 15 is connected to the second end 122 of the second radiating unit 12.

[0070] In some embodiments, the distance between the fifth radiation unit and the fourth radiation unit (or called the gap width) is within the first distance range. In this way, when the terminal antenna is working, coupling can be generated between the fifth radiation unit and the fourth radiation unit, and the current intensity on the fifth radiation unit and the fourth radiation unit will be stronger, which can improve the radiation efficiency of the terminal antenna.

[0071] In some embodiments, the coupling strength between the fifth radiation element and the fourth radiation element may be adjusted by adjusting the length and width of the gap between the fifth radiation element and the fourth radiation element.

[0072] In some embodiments, Figure 4 As shown, the second end 122 of the second radiation unit 12 exceeds the leftmost side of the fourth radiation unit 14, and the second radiation unit 12 and the fifth radiation unit 15 half surround the first radiation unit 11 and the fourth radiation unit 14; when the terminal antenna is working, there is also current on the PCB main board, and the distance between the fifth radiation unit and the PCB main board is also within the first distance range. In this way, coupling can also be generated between the fifth radiation unit and the PCB main board, thereby increasing the intensity of the current on the fifth radiation unit, and further increasing the radiation efficiency of the terminal antenna.

[0073] The embodiment of the present application does not impose any specific restrictions on the shape and size of the fifth radiation unit. In practical applications, the shape and size of the fifth radiation unit can be determined according to design requirements.

[0074] Please refer to Figure 5In some embodiments, the first radiation unit includes a first radiation branch F1 and a second radiation branch F2 distributed in sequence in a direction close to the third radiation unit; the second radiation unit includes a third radiation branch F3 and a fourth radiation branch F4 distributed in sequence in a direction close to the third radiation unit; the distance between the first radiation branch F1 and the third radiation branch F3 is smaller than the distance between the second radiation branch F2 and the fourth radiation branch F4, and the distance between the first radiation branch F1 and the third radiation branch F3, and the distance between the second radiation branch F2 and the fourth radiation branch F4 are both within a target distance range, and the target distance range refers to a distance range that can produce resonance.

[0075] Optionally, the target distance range refers to a range of not less than 0.3 mm and not more than 1.5 mm. The target distance range is obtained based on the experience of personnel in this technical field. In actual applications, the distance between the first radiation branch and the third radiation branch, and the distance between the second radiation branch and the fourth radiation branch can be determined based on design requirements, and the embodiments of the present application do not limit this.

[0076] In this case, the first radiating branch and the third radiating branch, the second radiating branch and the fourth radiating branch can excite multiple harmonics with higher intensity through coupling. The frequencies of the multiple harmonics are twice, three times, and so on, the operating frequency corresponding to the equivalent length of the terminal antenna. The terminal antenna can then operate at multiples of the operating frequency corresponding to the equivalent length of the original antenna, thereby expanding the operating frequency band of the antenna.

[0077] For example, for Figure 5 For the terminal antenna shown, assuming that the current operating frequency band of the terminal antenna includes the 824MHz to 880MHz frequency band, the equivalent length corresponding to the center frequency of the operating frequency band is the length of the above path b, and path b passes through the first radiation branch, the second radiation branch, the third radiation branch, and the fourth radiation branch. At this time, the first radiation branch and the third radiation branch, the second radiation branch and the fourth radiation branch can excite the triple frequency of the 824MHz to 880MHz frequency band, that is, the 2472MHz to 2640MHz frequency band, through coupling. At this time, the terminal antenna can also work in the 2472MHz to 2640MHz frequency band.

[0078] However, it should be noted that in actual applications, the intensity of the frequency doubling excited by coupling will not be very strong. If only the frequency doubling excited by coupling is used to allow the terminal antenna to work in the corresponding frequency doubling band, the radiation efficiency of the terminal antenna will not be too high. Therefore, in some embodiments, the frequency doubling excited by coupling of the first radiating branch and the third radiating branch, the second radiating branch and the fourth radiating branch is located within the working frequency band corresponding to the above-mentioned path e or f, or partially overlaps with the working frequency band corresponding to the above-mentioned path e or f. In this way, the radiation efficiency of the terminal antenna in the working frequency band corresponding to the above-mentioned path e or f can be improved, or while improving the radiation efficiency of the terminal antenna in the working frequency band corresponding to the above-mentioned path e or f, the bandwidth of the working frequency band corresponding to the above-mentioned path e or f can be expanded.

[0079] For example, Figure 5 The terminal antenna shown can work in four frequency bands of 824MHz to 880MHz, 880MHz to 960MHz, 1710MHz to 2300MHz and 2300MHz to 2700MHz, and the current paths corresponding to the four frequency bands are the above paths b, c, e and f respectively. When the terminal antenna works in the frequency band of 1710MHz to 2300MHz, the corresponding current path is path e. Since paths c and e also correspond to the first ground terminal, part of the current on the radiation body flows through path c (corresponding to the frequency band of 880MHz to 960MHz). The coupling between the first radiation branch and the third radiation branch, and the second radiation branch and the fourth radiation branch can excite the double frequency of the frequency band of 880MHz to 960MHz, that is, 1760MHz to 1920MHz, and the frequency band of 1760MHz to 1920MHz is within the frequency band of 1710MHz to 2300MHz. Therefore, the radiation efficiency of the terminal antenna in the frequency band of 1710MHz to 2300MHz is higher.

[0080] When the terminal antenna operates in the frequency band of 2300MHz to 2700MHz, the corresponding current path is path f. Since paths b and f also correspond to the second grounding terminal, part of the current on the radiating body flows through path b (corresponding to the frequency band of 824MHz to 880MHz). The coupling between the first radiating branch and the third radiating branch, and between the second radiating branch and the fourth radiating branch can excite the triple frequency of the frequency band of 824MHz to 880MHz, that is, 2472MHz to 2640MHz. The frequency band of 2472MHz to 2640MHz is within the frequency band of 2300MHz to 2700MHz. Therefore, the radiation efficiency of the terminal antenna in the frequency band of 2472MHz to 2640MHz is also higher.

[0081] In fact, each radiation unit included in the radiation body of the above-mentioned terminal antenna may include one or more radiation branches. The sizes and shapes of the multiple radiation branches included in a radiation unit may be the same or different. The number, size and shape of the radiation branches included in each radiation unit may be adjusted according to actual design requirements, and the embodiments of the present application do not limit this.

[0082] For example, Figure 6 As shown, the radiation body of the terminal antenna includes the above-mentioned first radiation unit, second radiation unit, third radiation unit, fourth radiation unit and fifth radiation unit. Among them, the first radiation unit includes the first radiation branch F1 and the second radiation branch F2, the first radiation branch F1 has a first slot K1 and a second slot K2, and the first radiation branch F1 includes a first sub-radiation branch F11, a second sub-radiation branch F12 and a third sub-radiation branch F13; the second radiation unit includes a third radiation branch F3 and a fourth radiation branch F4; the third radiation unit 13 includes a fifth radiation branch F5; the fourth radiation unit includes a sixth radiation branch F6 and a seventh radiation branch F7; the fifth radiation unit includes an eighth radiation branch F8. The terminal antenna also includes the above-mentioned feed terminal 2, a first grounding terminal 31 and a second grounding terminal 32.

[0083] Assumptions Figure 6 The terminal antenna shown can realize all the functions of the terminal antenna in the previous example, and when the terminal antenna is working, there is also current on the PCB mainboard. It can be seen from the simulation of the terminal antenna that when the terminal antenna works in the 824MHz~880MHz frequency band, the main radiation branches of the antenna are the first radiation branch, the second radiation branch and the third radiation branch. The coupling generated between the first radiation branch and the third radiation branch, between the second radiation branch and the fourth radiation branch, between the first radiation branch and the PCB mainboard, and between the second radiation branch and the PCB mainboard enhances the intensity of the current on the main radiation branches of the antenna, and improves the radiation efficiency of the antenna in the 824MHz~880MHz frequency band.

[0084] When the antenna operates in the frequency band of 880MHz to 960MHz, the main radiation branches of the antenna are the first radiation branch, the second radiation branch and the fifth radiation branch. The coupling between the first radiation branch and the third radiation branch, between the second radiation branch and the fourth radiation branch, between the first radiation branch and the PCB main board, between the second radiation branch and the PCB main board, and between the first sub-radiation branch and the second sub-radiation branch enhances the intensity of the current on some of the main radiation branches of the antenna, namely the first and second radiation branches, and improves the radiation efficiency of the antenna in the frequency band of 880MHz to 960MHz.

[0085] When the antenna operates in the frequency band of 1710MHz to 2300MHz, the main radiation branches of the antenna are divided into two parts, one part is the sixth radiation branch and the seventh radiation branch, and the other part is the main radiation branches at twice the frequency of the 880MHz to 960MHz frequency band - the first radiation branch, the second radiation branch and the fourth radiation branch (the main radiation branches at twice the frequency of the 880MHz to 960MHz frequency band are slightly different from the main radiation branches in the 880MHz to 960MHz frequency band). This part of the radiation branches improves the radiation efficiency of the antenna in the frequency band of 1710MHz to 2300MHz.

[0086] When the antenna operates in the frequency band of 2300MHz to 2700MHz, the main radiation branches of the antenna are also divided into two parts, one part is the sixth radiation branch and the seventh radiation branch, and the other part is the main radiation branches of the triple frequency of the frequency band of 824MHz to 880MHz - the third radiation branch, the fifth radiation branch and the eighth radiation branch (the main radiation branches of the triple frequency of the frequency band of 824MHz to 880MHz are also different from the main radiation branches of the frequency band of 824MHz to 880MHz). This part of the radiation branches improves the radiation efficiency of the antenna in the frequency band of 2300MHz to 2700MHz.

[0087] When the antenna operates in the frequency bands of 1710MHz to 2300MHz and 2300MHz to 2700MHz, the coupling between the first sub-radiation branch and the third sub-radiation branch, between the third radiation branch and the sixth radiation branch, between the eighth radiation branch and the sixth radiation branch, between the eighth radiation branch and the seventh radiation branch, and between the seventh radiation branch and the PCB mainboard enhances the intensity of the current on the sixth and seventh radiation branches, which are part of the main radiation branches of the antenna, thereby improving the radiation efficiency of the antenna in these two frequency bands.

[0088] In order to further illustrate the rationality of the embodiment of the present application, the return loss of the terminal antenna is tested. Return loss is an indicator that measures the ratio of the power reflected back by the signal during transmission to the input power, usually expressed in dB (decibel). If the absolute value of the return loss value corresponding to a certain frequency in the return loss graph is greater than 0dB, it means that the terminal antenna can work at this frequency. The larger the absolute value of the return loss value, the higher the radiation efficiency of the terminal antenna at this frequency. Figure 7 , Figure 8 , Fig. 9 These are all return loss graphs of the terminal antenna. The horizontal axis is the signal frequency, and the vertical axis is the return loss value. The frequency corresponding to the concave part of the waveform in the graph is the operating frequency at which the terminal antenna can work normally.

[0089] Figure 7The return loss corresponding to the frequency band of 824MHz to 880MHz (waveform 701) and the return loss corresponding to the triple frequency of the frequency band of 824MHz to 880MHz (waveform 702) are shown. Figure 8 The return loss corresponding to the frequency band of 880MHz to 960MHz (waveform 801) and the return loss corresponding to the double frequency of the frequency band of 880MHz to 960MHz (waveform 802) are shown. Fig. 9 The return loss corresponding to the 1710MHz to 2300MHz frequency band (at waveform 901) and the return loss corresponding to the 2300MHz to 2700MHz frequency band (at waveform 902) are shown. From the frequency values ​​marked in each return loss graph, it can be seen that the terminal antenna can operate in the 824MHz to 880MHz frequency band, the 880MHz to 960MHz frequency band, the 1710MHz to 2300MHz frequency band, and the 2300MHz to 2700MHz frequency band.

[0090] In the embodiment of the present application, since the multiple ground terminals are located on the same side of the feed terminal, and the feed terminal and the multiple ground terminals are spaced and distributed in the direction close to the third radiation unit, the path length through which the current flows can be different by switching the ground terminal, so that the terminal antenna has a plurality of different selectable equivalent lengths, and then the terminal antenna can work in a variety of different frequency bands, which meets the application of the terminal antenna in a variety of scenarios. Through the connection of the first radiation unit, the second radiation unit and the third radiation unit, the terminal antenna is roughly "U" shaped as a whole, so that under the same operating frequency requirements, the terminal antenna can reduce the space occupied by the antenna and meet the needs of more intelligent device designs. At the same time, the first slot and the second slot also allow the antenna to further increase the equivalent length of the antenna while the size of the space occupied by the antenna remains almost unchanged. Under the design requirements of the same operating frequency, the first slot and the second slot can further make the antenna have a smaller size. Through the first slot and the second slot, the current selectable path is also increased, so that the antenna has more different equivalent lengths, so that the terminal antenna can work at more different frequencies. Through the design of the fourth radiation unit, the selectable paths of the current are also increased, so that the antenna can have more different equivalent lengths, and the terminal antenna can operate at more different frequencies.

[0091] When the radiation body further includes a fifth radiation unit, and the distance between the fifth radiation unit and the fourth radiation unit is within the first distance range, the fifth radiation unit and the fourth radiation unit can be coupled, thereby enhancing the current intensity on the fourth radiation unit, thereby improving the radiation efficiency of the terminal antenna. Similarly, when the gap width between each radiation unit is within the first distance range, when the antenna is working, the coupling generated between the two radiation units at the gap can make the current intensity on the corresponding radiation unit stronger, thereby improving the radiation efficiency of the terminal antenna.

[0092] In addition, when the distance between the first radiation branch and the third radiation branch is smaller than the distance between the second radiation branch and the fourth radiation branch, and the distance between the first radiation branch and the third radiation branch, and the distance between the second radiation branch and the fourth radiation branch are both within the target distance range, the first radiation branch and the third radiation branch, the second radiation branch and the fourth radiation branch can excite the multiple of the working frequency corresponding to the equivalent length of the antenna through coupling, and the terminal antenna can operate at the multiple of the working frequency corresponding to the equivalent length of the antenna, thereby further expanding the working frequency band of the antenna; and, when the excited multiple is within a certain working frequency band originally corresponding to the above-mentioned terminal antenna, or partially overlaps with a certain working frequency band originally corresponding to the terminal antenna, it is also possible to improve the radiation efficiency of the terminal antenna within the working frequency band, or expand the bandwidth of the working frequency band while improving the radiation efficiency of the terminal antenna within the working frequency band.

[0093] Fig.10 A terminal device provided in an embodiment of the present application is shown, the terminal device comprising the above Figure 6 The terminal antenna 1001 and the PCB mainboard 1002 are shown. When the terminal device is receiving and transmitting signals, the terminal antenna can realize any function in the previous embodiment.

[0094] It should be understood that the "at least one" mentioned herein refers to one or more, and "multiple" refers to two or more. In the description of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not limit them to be necessarily different.

[0095] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A terminal antenna, characterized in that: The terminal antenna comprises a radiation body, and a feeding terminal and a plurality of ground terminals connected to the radiation body; The radiation body comprises a first radiation unit, a second radiation unit and a third radiation unit, the first radiation unit and the second radiation unit are both in a strip structure and are both located on the same side of the third radiation unit, and the first end of the first radiation unit and the first end of the second radiation unit are both connected to the third radiation unit; The feeding terminal and the multiple grounding terminals are both located on a side of the first radiating unit away from the second radiating unit, and the multiple grounding terminals are located on the same side of the feeding terminal. The feeding terminal and the multiple grounding terminals are spaced apart in a direction close to the third radiating unit, and are both connected to the first radiating unit.

2. The terminal antenna according to claim 1, characterized in that: The first radiation unit has a first slot running through it; The first slot is located on a side of the first grounding terminal away from the feeding terminal, the first end of the first slot is close to the first grounding terminal and extends to the edge of the first radiation unit, the second end of the first slot is away from the first grounding terminal, and the first grounding terminal is the one farthest from the feeding terminal among the multiple grounding terminals.

3. The terminal antenna according to claim 2, characterized in that: The first slot is L-shaped.

4. The terminal antenna according to any one of claims 1 to 3, characterized in that: The first radiation unit has a second slot running through it; The first end of the second slot is located at a side of the feeding terminal away from the third radiation unit and extends to an edge of the first radiation unit, and the second end of the second slot is located at a side of the feeding terminal close to the third radiation unit; The radiation body further includes a fourth radiation unit, which is located on a side of the first radiation unit away from the second radiation unit and connected to the second end of the first radiation unit.

5. The terminal antenna according to claim 4, characterized in that: The radiation body further includes a fifth radiation unit; The fifth radiation unit is located on a side of the second radiation unit close to the first radiation unit and on a side of the fourth radiation unit away from the third radiation unit. The fifth radiation unit is connected to the second end of the second radiation unit.

6. The terminal antenna according to claim 4, characterized in that: The second end of the second slot is located at a side of the second grounding terminal close to the third radiation unit, and the second grounding terminal is one of the multiple grounding terminals closest to the feeding terminal.

7. The terminal antenna according to claim 6, characterized in that: The second slot is L-shaped, and an end of a short side of the second slot forms a first end of the second slot.

8. The terminal antenna according to any one of claims 1 to 7, characterized in that: The first radiation unit includes a first radiation branch and a second radiation branch distributed in sequence in a direction close to the third radiation unit; The second radiation unit includes a third radiation branch and a fourth radiation branch sequentially distributed in a direction close to the third radiation unit; The distance between the first radiation branch and the third radiation branch is smaller than the distance between the second radiation branch and the fourth radiation branch, and the distance between the first radiation branch and the third radiation branch, and the distance between the second radiation branch and the fourth radiation branch are both within a target distance range, which refers to a distance range that can produce resonance.

9. The terminal antenna according to claim 8, characterized in that: The target distance range refers to a range not less than 0.3 mm and not more than 1.5 mm.

10. A terminal device, characterized in that: The terminal device comprises the terminal antenna according to any one of claims 1-9.

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