CN118117283A

CN118117283A - Wearable light-duty flexible antenna and wearable terminal equipment

Info

Publication number: CN118117283A
Application number: CN202410300092.9A
Authority: CN
Inventors: 杨凌升; 韩天琦
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2024-03-15
Filing date: 2024-03-15
Publication date: 2024-05-31

Abstract

The invention discloses a wearable light flexible antenna and a wearable terminal device, wherein the flexible antenna comprises: the device comprises a radiation unit, a microstrip line, a dielectric substrate and a grounding unit; the radiation patch and the microstrip line are arranged on the upper surface of the dielectric substrate, and the grounding unit is arranged on the lower surface of the dielectric substrate; the first side of the radiating unit is connected with the microstrip line, and an L-shaped groove is inserted into the radiating unit; a gap exists between the microstrip line and the second side of the radiating element; the antenna has the characteristics of double-frequency dipole and unidirectional radiation, has simple design of a feed structure, has better flexibility and portability, is suitable for human bodies, and can be more comfortably attached to the human bodies, so that more wearable application scenes are expanded.

Description

Wearable light-duty flexible antenna and wearable terminal equipment

Technical Field

The invention belongs to the field of antennas, and particularly relates to a wearable light flexible antenna and wearable terminal equipment.

Background

Wearable equipment is one of the technical fields of rapid development in recent years, covers various products such as intelligent watches, health monitors, intelligent glasses and the like, and has wide application prospects in the fields of medical treatment, health monitoring, sports fitness and the like. However, to achieve efficient communication, these devices require an efficient antenna system.

The use of conventional rigid antennas in wearable devices is somewhat limited because they are difficult to match with flexible, curved or bent devices, which may affect communication performance and user comfort. In addition, the existing wearable antenna meeting the dual-frequency dual polarization is realized by adopting a complex feed structure, so that the communication efficiency and bandwidth of the antenna are reduced, the equipment is heavy, the weight is not enough, the wearable comfort is reduced, and the stability and the anti-interference performance of the antenna are reduced.

Disclosure of Invention

Aiming at the problems, the invention provides the wearable light flexible antenna and the wearable terminal equipment, wherein the feeding structure formed by the L-shaped groove and the slit in the radiating unit in the flexible antenna is combined with the grounding unit, so that the antenna has the characteristics of double-frequency dipole and unidirectional radiation, the feeding structure of the antenna is simple in design, and the flexibility and the portability of the antenna are better in adaptability to human bodies, can be more comfortably attached to the human bodies, and further expand more wearable application scenes.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

In one aspect, the invention provides a wearable lightweight flexible antenna, comprising: the device comprises a radiation unit, a microstrip line, a dielectric substrate and a grounding unit; the radiation patch and the microstrip line are arranged on the upper surface of the dielectric substrate, and the grounding unit is arranged on the lower surface of the dielectric substrate; the first side of the radiating unit is connected with the microstrip line, and an L-shaped groove is inserted into the radiating unit; the microstrip line has a gap with the second side of the radiating element.

Optionally, the radiation unit, the microstrip line and the grounding unit are all made of fine copper strips by cross braiding, wherein the width of the fine copper strips is 0.25mm, and the interval between the fine copper strips is 0.5mm.

Optionally, the radiating element has a first side length of 2.25mm, a second side length of 7.25-11.25mm, a third side length of 20.25mm, a fourth side length of 21.75mm, a fifth side length of 22.5mm, and a sixth side length of 10.5-14.5mm.

Optionally, the length of the gap is 7.25-11.25mm, and the width is 1.25-2.25 mm.

Optionally, the L-shaped groove includes a square portion, a first rectangular portion connected to the square portion, and a second rectangular portion; the first rectangular part is arranged in parallel with the gap; the width of the first rectangular part and the second rectangular part is 1mm, and the length of the first rectangular part and the second rectangular part is 0.5mm-4.5mm; the side length of the square part is 1mm; the distance between the first rectangular part and the sixth side of the radiating unit is 3mm-5mm.

Optionally, square connection is added at the corner of the radiating unit and the L-shaped groove, so that error occurrence caused by dead point connection is prevented.

Optionally, the flexible antenna adopts a side feed mode of microstrip line feed, and the characteristic impedance of the microstrip line is 50 ohms; the connection part of the grounding unit and the feed port of the microstrip line adopts a square structure with the side length of 1 mm; the width of the microstrip line is 1mm.

Optionally, the flexible antenna has two working frequency bands, and the working center frequencies of the frequency bands are 4.86GHz and 5.56GHz respectively.

Optionally, the material of the dielectric substrate is felt, the relevant dielectric constant is 1.36, the dielectric loss tangent is 0.02, and the thickness of the felt is 1mm.

In another aspect, the invention provides a wearable terminal device, which is characterized by comprising the wearable light flexible antenna according to the first aspect.

Compared with the prior art, the invention has the beneficial effects that:

The invention provides a wearable light flexible antenna and a wearable terminal device, wherein an L-shaped groove, a microstrip line and a slit in a radiating unit in the flexible antenna are combined with a grounding unit to form a feed structure, so that the antenna has the characteristics of double-frequency dipole and unidirectional radiation, can select optimal signals in different frequency bands and polarization directions, can realize more stable communication, improves the anti-interference capability, can switch different frequency bands and polarization modes according to different application scenes and communication modes, adapts to diversified requirements and improves the flexibility; and the antenna feed structure is simple in design, and the flexibility and the portability are better in adaptability to human bodies, so that the antenna can be more comfortably attached to the human bodies, and more wearable application scenes are expanded.

The radiating unit, the microstrip line and the grounding unit are all made of thin copper strips by cross braiding, the thin copper strips have the advantages of stability, light weight, small volume, cost saving, more concentrated signals received by the antenna, better impedance matching degree of the antenna, improved bandwidth of the antenna, and capability of carrying out directional diagram polarization switching and diversity operation according to a communication state.

Drawings

For a clearer description of an embodiment of the invention or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, in which:

FIG. 1 is a schematic perspective view of an antenna according to an embodiment of the present invention;

FIG. 2 is a side view of an antenna according to one embodiment of the invention;

FIG. 3 (a) is a top view of a radiating element of an antenna according to an embodiment of the present invention;

FIG. 3 (b) is a schematic diagram showing parameters of a radiating element of an antenna according to an embodiment of the present invention

FIG. 4 is a top view of a grounding element of an antenna according to an embodiment of the present invention;

FIG. 5 is a graph showing the simulation results of reflection characteristics of an all-metal patch antenna as a function of the length S of an L-shaped slot;

FIG. 6 is a graph showing simulation results of reflection characteristics of an all-metal patch antenna as a function of the distance L3 of an L-shaped slot from an antenna boundary;

fig. 7 is a graph showing simulation results of reflection characteristics of an all-metal patch antenna according to a length W2 of a slot between a microstrip line and a radiating element;

Fig. 8 is a graph showing simulation results of reflection characteristics of an all-metal patch antenna according to a width L4 of a slot between a microstrip line and a radiating element;

FIG. 9 is a graph showing the results of the reflection characteristics of the knitted antenna of the present invention;

fig. 10 (a) shows a horizontal plane radiation pattern at 4.86GHz for an antenna of the present invention;

FIG. 10 (b) shows a horizontal plane radiation pattern at 5.56GHz of the inventive antenna;

FIG. 11 (a) is a graph showing the radiation gain in the phi direction of the inventive antenna at 4.86 GHz;

Fig. 11 (b) shows a radiation gain diagram in the θ direction for an antenna of the present invention at 4.86 GHz;

FIG. 12 (a) is a graph showing the radiation gain in the phi direction of the inventive antenna at 5.56 GHz;

fig. 12 (b) shows a radiation gain diagram in the θ direction at 5.56GHz for an antenna of the present invention;

In the figure: 1. a radiation unit; 1-1, a first side of the radiating element; 1-2, a second side of the radiating element; 1-3, a third side of the radiating element; 1-4, a fourth side of the radiating element; 1-5, a fifth side of the radiating element; 1-6, a sixth side of the radiating element; 2. a microstrip line; 3. a dielectric substrate; 4. an L-shaped groove; 4-1, square portions; 4-2, a first rectangular portion; 4-3, a second rectangular portion; 5. a slit; 6. a ground unit (GND).

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may also include different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The principle of application of the invention is described in detail below with reference to the accompanying drawings.

Example 1

The invention provides a wearable light flexible antenna, which is characterized in that as shown in fig. 1-3 (a), a radiation unit 1, a microstrip line 2, a dielectric substrate 3 and a grounding unit 6; the radiation patch 1 and the microstrip line 2 are arranged on the upper surface of the dielectric substrate 3, and the grounding unit 6 is arranged on the lower surface of the dielectric substrate 3; the first side 1-1 of the radiating unit is connected with the microstrip line 2, and an L-shaped groove 4 is inserted into the radiating unit 1; the microstrip line 2 has a slot 5 with the second side 1-2 of the radiating element.

In a specific implementation of the embodiment of the present invention, as shown in fig. 3 (a) -4, the radiating element 1, the microstrip line 2 and the grounding element 6 are all made of fine copper strips by cross braiding, and simulate a knitting grid form in an ideal state; the length of the first side 1-1 of the radiating element is 2.25mm, the length of the second side 1-2 is 7.25-11.25mm, the length of the third side 1-3 is 20.25mm, the length of the fourth side 1-4 is 21.75mm, the length of the fifth side 1-5 is 22.5mm, and the length of the sixth side 1-6 is 10.5-14.5mm.

Specifically, in practical application, although the resonant frequency and the maximum gain of the low-density knitted antenna are slightly smaller than those of the high-density knitted antenna, the low-density knitted antenna still shows stable radiation characteristics, so that the structure of the knitted antenna has little influence on the radiation characteristics of the antenna, and therefore the wearable antenna is usually in a knitted form to reduce cost, and then the antenna disclosed by the invention is used for converting a copper plane into a hollowed-out structure with crossed thin copper strips on the basis of a microstrip patch antenna, the radiating element 1 and the ground plane (the ground element 6) of the antenna are formed by knitting the radiating element 1 and the ground element 6 of the antenna by spacing 0.5mm of the thin copper strips with the width of 0.25mm, the length L0 of the fifth side 1-5 of the radiating element of the antenna is 22.5mm, the length W0 of the fourth side 1-4 of the radiating element is 21.75mm, the width L4 of a gap 5 between the microstrip line 2 and the radiating element 1 is 1.25mm-2.25mm, and the length W2 of the gap 5 is 7.25-11.25mm.

In one embodiment of the present invention, as shown in fig. 3 (a) -3 (b), the L-shaped groove 4 includes a square portion 4-1, a first rectangular portion 4-2 and a second rectangular portion 4-3 connected to the square portion 4-1; the first rectangular portion 4-2 is arranged in parallel with the slit 5; the width of the first rectangular part 4-2 and the second rectangular part 4-3 is 1mm, and the length is 0.5mm-4.5mm; the side length of the square part 4-1 is 1mm; the distance L3 of the first rectangular portion 4-2 from the sixth side 1-6 of the radiating element is 3mm-5mm. Square connection is added at the hollowed-out corner of the L-shaped groove of the radiating element, so that the occurrence of errors caused by point connection is prevented, the net-shaped ground structure is not damaged, and the unidirectional radiation of the antenna is not affected.

Specifically, in the preferred embodiment of the present invention, the L-shaped groove of the radiation unit 1 has a length S of 4.5mm (the lengths of the first rectangular portion 4-2 and the second rectangular portion 4-3) and a width L2 of 1mm (the widths of the first rectangular portion 4-2 and the second rectangular portion 4-3). The antenna has the characteristic of dual-frequency and dual-polarization by using a gap 5 between the microstrip line 2 and the radiating element 1 and using an L-shaped groove 5 on the radiating element 1.

In a specific implementation manner of the embodiment of the invention, the flexible antenna adopts a side feed mode of microstrip line feed, and the characteristic impedance of the microstrip line is 50 ohms; the connection part of the grounding unit 6 and the feeding port of the microstrip line 2 uses a square structure with a side length of 1mm, so that better feeding is realized, as shown in fig. 4. The antenna feed adopts a side feed mode of microstrip line feed, wave port excitation is adopted, the lower edge of the wave port coincides with the reference ground (the grounding unit 6), the upper edge coincides with the microstrip line 2, the characteristic impedance of the microstrip line is 50 ohms, and the impedance matching of a gap inserted between the feed microstrip line 2 and the radiating unit 1 can be improved.

In one embodiment of the present invention, the material of the dielectric substrate 6 is felt, the relative dielectric constant is 1.36, the dielectric loss tangent is 0.02, and the thickness of the felt is 1mm.

In one embodiment of the present invention, a graph of the simulation results of the reflection characteristics of an all-metal patch antenna as a function of the length S of the L-shaped slot is shown in fig. 5. The size of the radiating element (radiating element 1), the length W2 of the gap 5 and the size of the L-shaped groove 4 are properly adjusted, so that a dual-frequency resonant antenna can be obtained; by varying the size of the length S of the L-shaped slot 4 (the length of the first rectangular portion 4-2 and the second rectangular portion 4-3), the effect on the antenna performance is observed.

At this time, 5.10GHz and 5.60GHz are selected as center frequencies, and scanning analysis with the step length of 0.02GHz is carried out on the frequency range of 4.8GHz-5.8GHz, and as can be seen from FIG. 5, the antenna can realize double-frequency resonance, and the return loss at two resonance points is smaller than-10 dB; next, the length W2 of the slot 5 between the microstrip line 2 and the antenna is set to 11.25mm, the width L4 of the slot 5 is 1.25mm, the distance L3 between the L-shaped slot 4 and the boundary of the antenna (the sixth side 1-6 of the radiating element) is 3mm, the width L2 of the L-shaped slot 4 (the width of the first rectangular portion 4-2 and the second rectangular portion 4-3) is 1mm, the length S (the length of the first rectangular portion 4-2 and the second rectangular portion 4-3) is in the range of 0.5mm to 4.5mm, and the interval is 1mm, and as seen from the figure, as the length S of the L-shaped slot 4 (the length of the first rectangular portion 4-2 and the second rectangular portion 4-3) increases, the curve gradually moves to the left, the influence of the length S on the resonance frequency at the low frequency is large, and the influence on the resonance frequency at the high frequency is small. When the length s=4.5 mm of the L-shaped groove 4, the resonance frequency at the low frequency is about 5.02GHz, and the resonance frequency at the high frequency is about 5.60GHz, and impedance matching is practically acceptable.

In one embodiment of the present invention, a graph of the reflection characteristics of an all-metal patch antenna as a function of the distance L3 of the L-shaped slot from the antenna boundary is shown in fig. 6. By varying the size of L3 (distance of the first rectangular portion 4-2 from the sixth side 1-6 of the radiating element) the effect on the antenna performance is observed.

At this time, the length W2 of the slot 5 between the microstrip line 2 and the radiating element 1 was set to 11.25mm, the width L4 of the slot 5 was set to 1.25mm, the length S of the L-shaped groove was set to 4.5mm, the width was set to 1mm, the distance L3 from the antenna boundary was set to 3mm to 5mm, and the interval was set to 1mm. The antenna can realize double-frequency resonance by selecting 5.10GHz and 5.60GHz as central frequencies and carrying out scanning analysis with the step length of 0.02GHz on the frequency range of 4.8GHz-5.8GHz, and the return loss at two resonance points is less than-10 dB, compared with the length S (the length of the first rectangular part 4-2 and the second rectangular part 4-3) of the L-shaped groove 4, the influence of the change of L3 on the resonance frequency is less, the curve offset amplitude is not great, and the S with proper size is more critical.

In a specific implementation of the embodiment of the present invention, as shown in fig. 7, a graph of simulation results of reflection characteristics of an all-metal patch antenna according to a length W2 of a gap between a microstrip line and a radiating element is shown. By varying the size of W2, the effect on antenna performance was observed.

At this time, the distance L3 between the L-shaped groove 4 and the antenna boundary (the distance between the first rectangular portion 4-2 and the sixth side 1-6 of the radiating element) is set to 3mm, the width of the L-shaped groove 4 is 1mm, the length S is 4.5mm, the width L4 of the slot 5 between the microstrip line 2 and the radiating element 1 is 1.25mm, the length W2 of the slot 5 is in the range of 7.25mm-11.25mm, and the interval is 1mm. By selecting 5.10GHz and 5.60GHz as central frequencies and carrying out scanning analysis with the step length of 0.02GHz on the frequency range of 4.8GHz-5.8GHz, the antenna can realize double-frequency resonance, the return loss at a high-frequency resonance point is smaller than-10 dB, the return loss at a low-frequency resonance point is gradually smaller than-10 dB along with the increase of W2, when W2 = 11.25mm, the return loss at two resonance points is smaller than-10 dB, and the two resonance points are respectively about 5.00GHz and 5.58GHz, and the impedance matching is practically acceptable.

In a specific implementation of the embodiment of the present invention, as shown in fig. 8, a graph of simulation results of reflection characteristics of an all-metal patch antenna according to a width L4 of a gap between a microstrip line and a radiating element is shown. Observing the influence on the antenna performance by changing the size of L4;

At this time, the distance L3 between the L-shaped slot 4 and the boundary of the antenna (the distance between the first rectangular portion 4-2 and the sixth side 1-6 of the radiating element) is 3mm, the width L2 of the L-shaped slot 4 is 1mm, the length S is 4.5mm, the length W2 of the gap 5 between the microstrip line 3 and the radiating element 1 is 11.25mm, the width L4 ranges from 1.25mm to 2.25mm, the interval is 0.5mm, 5.10GHz and 5.60GHz are selected as center frequencies, and scanning analysis with a step length of 0.02GHz is performed for the frequency range of 4.8GHz to 5.8GHz, as can be seen from the figure, when L4 is greater than 2.25mm, the antenna cannot realize dual-frequency resonance in the selected frequency range, when l4=1.25 mm, the return loss at both resonance points is less than-10 dB.

In one embodiment of the present invention, a graph of the results of the reflection characteristics of the antenna of the present invention is shown in fig. 9. The width of the thin metal wires (thin copper strips) is 0.25mm, the interval between the thin metal wires (thin copper strips) is 0.5mm, the width L4 of the gap 5 is 1.25mm, the length W2 is 11.25mm, the distance L3 between the L-shaped groove 4 and the boundary of the antenna is 3mm, the width L2 is 1mm, the length S is 4.5mm, a dual-frequency resonant antenna can be obtained, a mode driving solving type is set, 4.86GHz and 5.56GHz are selected as central frequencies, scanning analysis with the step length of 0.02GHz is carried out on the frequency range of 4GHz-6GHz, the return loss at the two resonance points is smaller than-10 dB, the bandwidth of the return loss smaller than-10 dB is about 4.83GHz-4.89GHz and 5.52GHz-5.62GHz, and impedance matching is practically acceptable.

In one embodiment of the present invention, as shown in fig. 10 (a) -10 (b), the horizontal radiation patterns of the antenna of the present invention at 4.86GHz and 5.56GHz, respectively. The observation shows that the antenna has good radiation performance, stable radiation and good directivity, and can be used in the medical field.

In a specific implementation manner of the embodiment of the present invention, as shown in fig. 11 (a) -11 (b), radiation gain diagrams in the phi and theta directions of the antenna of the present invention at 4.86GHz are shown respectively. The antenna gain is found to be about 8.40dBi, the radiation performance of the antenna is good, the radiation is stable, and the directivity is good. Dual polarized radiation (E theta and E phi patterns of the antenna are orthogonal to each other) can be achieved and can be used in the wearable field.

In a specific implementation manner of the embodiment of the present invention, as shown in fig. 12 (a) -12 (b), radiation gain diagrams in the phi and theta directions of the antenna of the present invention are respectively shown at 5.56 GHz. The antenna gain is about 8.80dBi, the radiation performance of the antenna is good, the radiation is stable, and the directivity is good. Dual polarized radiation (E theta and E phi patterns of the antenna are orthogonal to each other) can be achieved and can be used in the wearable field.

By combining the analysis, the antenna of the invention researches the wearable knitting microstrip patch antenna, and discovers that the width and interval of the fine metal wires (fine copper strips) and the size parameters of the L-shaped groove 4 can influence the performance indexes of the antenna such as return loss, radiation gain and the like, so that the antenna is improved and optimized, and the practical application requirements are met. The slot 5 between the radiation unit 1 and the feeder line (microstrip line 2) can realize double frequency, and the adjustment of double frequency bands can be realized by adjusting the position relationship between the slot 5 and the L-shaped slot 4, and the patterns orthogonal to each other are respectively realized in the double frequency bands, namely, the dual polarization is realized. The antenna disclosed by the invention has the advantages that the knitted net structure is applied to the microstrip patch antenna, the weight of the antenna is realized, the antenna is provided with two resonance points in the frequency band range of 4GHz-6GHz, the return loss is less than-10 dB, the antenna gain diagrams at the two resonance points and in the directions show that the antenna can realize dual-polarized radiation, and the gains are about 8.40dBi and 8.80dBi respectively. Secondly, the antenna converts the copper patch plane of the radiating element (the radiating unit 1) and the ground plane into a thin copper strip which is intersected, so that the production cost of the antenna is reduced, the unidirectional radiation characteristic of the antenna is not affected, the structure is simple, the performance is good, the simulation effect is good, the practical application requirement is met, the manufacturing is simple, the antenna is convenient to be used as a small antenna near a human body, and the antenna is applied to the wearable field.

Example 2

The invention provides a wearable terminal device, which is characterized by comprising the wearable light flexible antenna in the embodiment 1.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present application.

The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A wearable lightweight flexible antenna, comprising: the device comprises a radiation unit, a microstrip line, a dielectric substrate and a grounding unit; the radiation patch and the microstrip line are arranged on the upper surface of the dielectric substrate, and the grounding unit is arranged on the lower surface of the dielectric substrate; the first side of the radiating unit is connected with the microstrip line, and an L-shaped groove is inserted into the radiating unit; the microstrip line has a gap with the second side of the radiating element.

2. The wearable light flexible antenna of claim 1, wherein the radiating element, microstrip line, and ground element are each made of a fine copper strip cross-knit with a width of 0.25mm and a spacing of 0.5mm.

3. The wearable lightweight flexible antenna of claim 1, wherein the radiating element has a first side length of 2.25mm, a second side length of 7.25-11.25mm, a third side length of 20.25mm, a fourth side length of 21.75mm, a fifth side length of 22.5mm, and a sixth side length of 10.5-14.5mm.

4. The wearable lightweight flexible antenna of claim 1, wherein the slot has a length of 7.25-11.25mm and a width of 1.25-2.25 mm.

5. The wearable lightweight flexible antenna of claim 3, wherein the L-shaped slot comprises a square portion, a first rectangular portion connected to the square portion, and a second rectangular portion; the first rectangular part is arranged in parallel with the gap; the width of the first rectangular part and the second rectangular part is 1mm, and the length of the first rectangular part and the second rectangular part is 0.5mm-4.5mm; the side length of the square part is 1mm; the distance between the first rectangular part and the sixth side of the radiating unit is 3mm-5mm.

6. The wearable lightweight flexible antenna of claim 1, wherein the radiating element adds square connections at the corners of the L-shaped slot for preventing dead center connections from causing errors.

7. The wearable light flexible antenna of claim 1, wherein the flexible antenna adopts a side feed mode of microstrip line feed, and the characteristic impedance of the microstrip line is 50 ohms; the connection part of the grounding unit and the feed port of the microstrip line adopts a square structure with the side length of 1 mm; the width of the microstrip line is 1mm.

8. The wearable lightweight flexible antenna of claim 1, wherein the flexible antenna has two operating frequency bands with frequency band operating center frequencies of 4.86GHz and 5.56GHz, respectively.

9. The wearable lightweight flexible antenna of claim 1, wherein the dielectric substrate is a felt of a material having a relative dielectric constant of 1.36, a dielectric loss tangent of 0.02, and a thickness of 1mm.

10. A wearable terminal device, characterized by comprising a wearable lightweight flexible antenna according to any of claims 1-9.