CN112864610B - Flexible antenna device and method for manufacturing the same - Google Patents
Flexible antenna device and method for manufacturing the same Download PDFInfo
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- CN112864610B CN112864610B CN202011624886.9A CN202011624886A CN112864610B CN 112864610 B CN112864610 B CN 112864610B CN 202011624886 A CN202011624886 A CN 202011624886A CN 112864610 B CN112864610 B CN 112864610B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/14—Supports; Mounting means for wire or other non-rigid radiating elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
Abstract
The present disclosure relates to a flexible antenna apparatus and a method of manufacturing the same. The device includes: the first fixing part and the second fixing part of the flexible substrate are fixedly arranged on the stretchable base, the annular connecting part is connected with the bearing part bearing the radiation unit, and the first fixing part and the second fixing part are respectively connected; the first lead is positioned on the annular connecting part and the first fixing part, the first end of the first lead is connected to the radiating unit, and the second end of the first lead is used for being connected to external equipment; the annular connecting part deforms under the action of self deformation and/or deformation caused by external force of the stretchable substrate, so that the bearing part is far away from or close to the stretchable substrate. The flexible antenna device and the manufacturing method thereof provided by the embodiment of the disclosure have the advantages that the manufactured device has stretchability, and the radiation unit is ensured not to deform, so that the radiation unit has stable resonant frequency.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a flexible antenna apparatus and a method for manufacturing the same.
Background
With the rapid development of modern science and technology, antennas are widely applied in the fields of medical treatment, mobile communication, aerospace and the like, and the requirements of people on the antennas are increased day by day. Flexible antennas are becoming the focus of research because of their light, thin, flexible, and conformable characteristics. The flexible antenna has higher concealment and has important significance for reconnaissance, ship stealth and the like; in the field of aerospace, the flexible antenna can be seamlessly fused with the aerospace suit, so that heavy equipment can be greatly reduced; in life, smart clothing made of flexible antennas and wearable computer systems are receiving increasing attention. However, when the flexible antenna is bent and deformed, due to the change of the bending radius, electrical parameters such as the working frequency, the directional diagram, the gain and the like of the flexible antenna are changed correspondingly, which causes that the flexible antenna cannot work normally under any bending radius, and is a technical problem to be solved urgently.
Disclosure of Invention
In view of the above, the present disclosure provides a flexible antenna device and a method for manufacturing the same.
According to an aspect of the present disclosure, there is provided a flexible antenna apparatus including: the radiating element, the flexible substrate with a symmetrical structure, the stretchable substrate and the first lead wire, wherein the flexible substrate comprises a first fixing part, a second fixing part, a bearing part and a ring-shaped connecting part matched with the bearing part in shape,
the first fixing part and the second fixing part are fixedly arranged on the stretchable substrate, and the annular connecting part is connected with the bearing part and the first fixing part and the second fixing part respectively;
the bearing part is used for bearing the radiation unit;
the first lead is positioned on the annular connecting part and the first fixing part, a first end of the first lead is connected to the radiating unit, and a second end of the first lead is used for being connected to external equipment;
the radiation unit is used for radiating the transmission signal from the external equipment into space for receiving by terminal equipment, and/or receiving the receiving signal from the terminal equipment, and sending the receiving signal to the external equipment through a first wire;
the annular connecting part deforms under the action of self deformation and/or deformation caused by external force of the stretchable substrate, so that the bearing part is far away from or close to the stretchable substrate.
For the above apparatus, in one possible implementation manner, the apparatus further includes:
and the second lead is positioned on the annular connecting part and the second fixing part, and the second lead and the first lead form a symmetrical structure.
For the above apparatus, in one possible implementation manner, the apparatus further includes:
at least one metal ground is mounted on the first fixing portion or the second fixing portion and serves as a ground of the device.
In a possible implementation manner of the above device, one or two protruding portions are provided at positions of the annular connecting portion corresponding to the bearing portion, the protruding portions are connected to the bearing portion, and gaps with the same size are provided between positions of the annular connecting portion other than the protruding portions and the bearing portion.
For the above device, in one possible implementation manner, the flexible substrate is a unitary structure.
With regard to the above apparatus, in a possible implementation manner, a shape of a vertical projection of the carrying part on the stretchable substrate includes any one of a circle, an ellipse, and a regular polygon;
the shape of the radiation unit comprises any one of a circular spiral shape, an elliptical spiral shape and a regular polygonal spiral shape;
the number of the bearing parts comprises at least one, and when the number of the bearing parts is multiple, the multiple bearing parts form a symmetrical structure;
the flexible substrate further comprises at least one third fixing part, and the first fixing part, the second fixing part and the third fixing part form a symmetrical structure.
For the above device, in one possible implementation manner, the thickness of the flexible substrate is 50 μm to 200 μm, the thickness of the radiation unit is 2 μm to 36 μm, and the thickness of the metal ground is 2 μm to 36 μm.
According to another aspect of the present disclosure, there is provided a flexible antenna device manufacturing method for manufacturing the above flexible antenna device, the method including:
etching the flexible film according to the determined shape and size of the flexible substrate to obtain a flexible substrate;
generating a metal layer on the flexible substrate;
etching the metal layer to form a radiation unit and a first lead;
and fixedly mounting a first fixing part and a second fixing part of the flexible substrate with the radiating element and the first lead on the stretchable substrate with the pre-strain to obtain the flexible antenna device.
For the above method, in a possible implementation manner, the first fixing portion and the second fixing portion of the flexible substrate with the radiating element and the first wire are fixedly mounted on the stretchable base with pre-strain, so as to obtain the flexible antenna apparatus, including any one of the following steps:
fixedly mounting a first fixing part and a second fixing part of a flexible substrate with a radiating element and a first lead on a stretchable substrate with pre-strain, and releasing the pre-stress of the stretchable substrate to obtain a flexible antenna device;
after bending the annular connecting part of the flexible substrate with the radiating unit and the first lead, fixedly installing the first fixing part and the second fixing part on the stretchable substrate with pre-strain to obtain the flexible antenna device;
after the annular connecting part of the flexible substrate with the radiating unit and the first lead is bent, the first fixing part and the second fixing part are fixedly installed on the stretchable substrate with the pre-strain, and the pre-stress of the stretchable substrate is released to obtain the flexible antenna device.
For the above method, in one possible implementation, the method further includes:
and after the annular connecting part of the flexible substrate with the radiating unit and the first lead is bent, the first fixing part and the second fixing part are fixedly arranged on the stretchable substrate, so that the flexible antenna device is obtained.
The flexible antenna device and the manufacturing method thereof provided by the embodiment of the disclosure have the advantages of simple manufacturing process and low cost, and the manufactured device forms a 3D (three-dimensional) structure through the arrangement of the flexible substrate when the device is stressed, so that the radiation unit is separated from the stretchable substrate, the main stress of the device is low, and the radiation unit is ensured not to deform, so that the radiation unit has stable resonant frequency. And moreover, the flexible antenna device has stretchability, so that the flexible antenna device is suitable for the use requirements of various flexible electronic systems.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a schematic structural diagram of a flexible antenna apparatus according to an embodiment of the present disclosure.
Fig. 2 illustrates a schematic plan structure diagram of a flexible antenna apparatus according to an embodiment of the present disclosure.
Fig. 3 illustrates a schematic plan view structure of a first conductive line and a second conductive line according to an embodiment of the present disclosure.
Fig. 4 shows a schematic plan structure of a flexible substrate according to an embodiment of the present disclosure.
Fig. 5 shows a schematic plan view of another flexible substrate according to an embodiment of the present disclosure.
Fig. 6 illustrates a flow diagram of a method of manufacturing a flexible antenna apparatus according to an embodiment of the present disclosure.
Fig. 7A-7E illustrate schematic structural variations of a flexible antenna apparatus according to an embodiment of the present disclosure.
Fig. 8 illustrates a schematic diagram of a resonant frequency change of a flexible antenna apparatus according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the subject matter of the present disclosure.
Fig. 1 illustrates a schematic structural diagram of a flexible antenna device according to an embodiment of the present disclosure, and fig. 2 illustrates a schematic planar structural diagram of a flexible antenna device according to an embodiment of the present disclosure. Wherein the stretchable substrate 4 is not shown in fig. 2. As shown in fig. 1 and 2, the flexible antenna device includes a radiating element 1, a flexible substrate having a symmetrical structure, a stretchable base 4, and a first wire 3, wherein the flexible substrate includes a first fixing portion 21, a second fixing portion 22, a carrying portion 24, and a loop-shaped connecting portion 23 matching the carrying portion in shape.
The carrying part 24 is used for carrying the radiation unit 1.
The first wire 3 is located on the ring-shaped connecting portion 23 and the first fixing portion 21, a first end of the first wire 3 is connected to the radiating unit 1, and a second end of the first wire 3 is used for connecting to an external device (not shown in the figure).
The radiation unit 1 is configured to radiate a transmission signal from the external device into a space for a terminal device (not shown in the figure) to receive, and/or receive a reception signal from the terminal device, and send the reception signal to the external device through the first wire 3.
The first fixing portion 21 and the second fixing portion 22 are fixedly mounted on the stretchable substrate 4, and the annular connecting portion 23 is connected to the carrying portion 24, and the first fixing portion 21 and the second fixing portion 22 are respectively connected.
The annular connecting portion 23 deforms under the action of the self-deformation and/or deformation caused by an external force of the stretchable substrate 4, so that the bearing portion 24 is far away from or close to the stretchable substrate 4.
In the present embodiment, in the initial state of the flexible antenna apparatus, the bearing portion 24 may be suspended above the stretchable substrate 4, that is, the ring-shaped connection portion 23 is suspended above the stretchable substrate 4 in a "convex" state, so that the flexible antenna apparatus operates in a 3D three-dimensional structure state. In an operating state of the flexible antenna apparatus, after the stretchable substrate 4 deforms and/or flexes due to an external force, a distance between the first fixing portion 21 and the second fixing portion 22 changes due to the deformation of the stretchable substrate 4, so that the annular connecting portion 23 deforms, and a height of a protrusion generated by the annular connecting portion changes, a relative distance between the bearing portion 24 and the stretchable substrate 4 changes, but a shape of the bearing portion 24 does not change, the bearing portion 24 is far away from or close to the stretchable substrate 4 in a deformation process of the annular connecting portion 23, and after the deformation of the annular connecting portion 23 is finished, the distance between the bearing portion 24 and the stretchable substrate 4 is fixed. And no matter whether the annular connecting part 23 is deformed or not, the shape of the bearing part 24 cannot be changed, so that the structure of the radiation unit 1 can be always stable.
In this embodiment, the bearing portion 24 may also be located on the stretchable substrate 4 in the initial state of the antenna device. In the operating state of the flexible antenna apparatus, after the stretchable substrate 4 deforms and/or deforms and flexes due to an external force, the distance between the first fixing portion 21 and the second fixing portion 22 decreases due to the deformation of the stretchable substrate 4, and the annular connecting portion 23 deforms to generate a protrusion, so that the flexible antenna apparatus operates in a 3D three-dimensional structural state. The relative distance between the carrying portion 24 and the stretchable substrate 4 may also change, but the shape of the carrying portion does not change, the carrying portion 24 moves away from or approaches the stretchable substrate 4 during the deformation of the annular connecting portion 23, and the distance between the carrying portion 24 and the stretchable substrate 4 is fixed after the deformation of the annular connecting portion 23 is finished. And no matter whether the annular connecting part 23 is deformed or not, the shape of the bearing part 24 cannot be changed, so that the structure of the radiation unit 1 can be always stable.
The flexible antenna device provided by the embodiment of the disclosure enables the radiating unit and the stretchable substrate to work in a separated state through the arrangement of the flexible substrate, so as to ensure that the stress of the stretchable substrate does not cause adverse effects on the radiating unit, and maintain the shape of the radiating unit unchanged while ensuring that the flexible antenna device can deform, so that the flexible antenna device has stable resonant frequency. Meanwhile, the illustrations of fig. 1 to 8 of the present disclosure are only exemplary examples of the present disclosure, and those skilled in the art may realize the separation of the radiation unit from the stretchable substrate in other ways to ensure that the shape of the radiation unit is maintained while the stretchable substrate is deformed, which is not limited by the present disclosure.
According to the flexible antenna device provided by the embodiment of the disclosure, through the arrangement of the flexible substrate, a 3D (three-dimensional) structure is formed when the device is stressed, the radiation unit is separated from the stretchable substrate, the main strain of the device is low, and the radiation unit is ensured not to deform, so that the radiation unit has stable resonant frequency. And, because flexible antenna device has stretchability, be applicable to the user demand of various flexible electronic systems.
In this embodiment, the material of the flexible substrate may be a Polymer material such as Polyimide (PI), polyethylene terephthalate (PET), Polyurethane (PU), Liquid Crystal Polymer (also called an industrial Liquid Crystal Polymer, LCP) film, polyether-ether-ketone (PEEK), or other flexible material capable of supporting the radiation unit. The material of the radiation unit 1 may be a metal material capable of radiating and receiving radio waves, such as copper, nickel, gold, platinum, silver, aluminum, or the like. The material of the stretchable substrate may be Polydimethylsiloxane (PDMS), TPU (thermoplastic polyurethane elastomer also called thermoplastic polyurethane rubber), copolyester such as Ecoflex, hydrogel, etc. materials with flexible and stretchable properties. The materials of the parts of the flexible antenna device can be set by those skilled in the art according to actual needs, and the present disclosure does not limit the materials.
Fig. 3 illustrates a schematic plan view structure of a first conductive line and a second conductive line according to an embodiment of the present disclosure. In one possible implementation, as shown in fig. 2 and 3, the apparatus may further include a second wire 6. And a second conductive line 6 disposed on the annular connection portion 23 and the second fixing portion 22, wherein the second conductive line 6 and the first conductive line 3 form a symmetrical structure. That is, the first wire 3 and the second wire 6 have a symmetrical structure with respect to the line A, B as a symmetry axis. Among them, the material of the second wire 6 may be a metal material capable of radiating and receiving radio waves, such as copper, nickel, gold, platinum, silver, aluminum, or the like.
As shown in fig. 3, the first wire 3 may include three portions: a strip-shaped first portion 31 on the first fixing portion 21 and the annular connecting portion 23, an approximately quarter-annular second portion 32 on the annular connecting portion 23, and a strip-shaped third portion 33 on the annular connecting portion 23. In order to form the symmetrical structure of the first conductive line 3 and the second conductive line 6, the materials of the first conductive line and the second conductive line need to be the same, and the sizes of the corresponding symmetrical positions are consistent. Therefore, the second conductive line 6 includes: three approximately quarter-ring-shaped ring portions 62 located on the ring-shaped connection 23, the ring portions 62 being symmetrically distributed with respect to the symmetry axis A, B with the second portion 32; a first strip-shaped portion 63 in the form of a strip on the annular connecting portion 23, the first strip-shaped portion 63 and the third portion 33 being symmetrically distributed with respect to the symmetry axis A, B; and a strip-shaped second strip-shaped portion 61 located on the second fixing portion 22 and the annular connecting portion 23, wherein the second strip-shaped portion 61 and the first portion are symmetrically distributed about the symmetry axis A, B.
In one possible implementation, as shown in fig. 3, a gap d1 is also provided between the second wire 6 and the first wire 3 to ensure insulation between the first wire 3 and the second wire 6. Meanwhile, in order to secure a symmetrical structure between the first wire 3 and the second wire 6, a corresponding gap d2 may also be provided in the second wire 6.
In a possible implementation manner, as shown in fig. 1 and fig. 2, the apparatus may further include: at least one metal ground 5. The metal ground 5 may also be referred to as a ground unit, the number of which corresponds to the connection mode between the external device and the apparatus, and the number and size of the metal ground 5 may be set according to the need of the external device.
And at least one metal ground 5 attached to the first fixing portion 21 or the second fixing portion 22, and serving as a ground of the device. In this way, the grounding requirements of the device are ensured when transmitting and/or receiving the transmission signal. Among them, the material of the metal ground 5 may be a metal material capable of radiating and receiving radio waves, such as copper, nickel, gold, platinum, silver, aluminum, or the like.
Fig. 4 shows a schematic plan structure diagram of a flexible substrate according to an embodiment of the present disclosure. In one possible implementation manner, as shown in fig. 4, one or two protruding portions 231 are provided at positions of the annular connecting portion 23 corresponding to the bearing portion 24, the protruding portions 231 are connected to the bearing portion 24, and gaps S of the same size are provided between positions of the annular connecting portion 23 other than the protruding portions 231 and the bearing portion 24.
In order to ensure that the plane where the carrying portion 24 is located is parallel to the plane where the stretchable substrate 4 is located, the protruding portions 231 may be disposed in the direction of the straight line a in fig. 4, each protruding portion is symmetrical with respect to the straight line a, and when there are two protruding portions, the shapes and the sizes of the two protruding portions are also the same, so as to ensure the symmetry of the flexible substrate.
In a possible implementation manner, the number of the bearing parts 24 can be one or more, and when the number of the bearing parts 24 is multiple, the multiple bearing parts 24 form a symmetrical structure. Each bearing part 24 is connected with the annular connecting part 23 or the adjacent bearing part 24, so that when the annular connecting part 23 deforms, the shape of each bearing part 24 cannot change, and the structure of the radiation unit 1 can be always stable.
In a possible implementation manner, the flexible substrate may further include at least one third fixing portion, and the first fixing portion 21, the second fixing portion 22 and the third fixing portion 23 form a symmetrical structure. So as to ensure that the shape of each bearing part 24 is not changed when the annular connecting part 23 is deformed, and the structure of the radiation unit 1 is always stable.
Wherein, when the number of bearing parts 24 is a plurality of and/or the flexible substrate includes at least one third fixed part, the shape of the above-mentioned annular connecting part 23 can also be adjusted to other shapes, such as the connecting part of shapes such as strip, rice word form to when guaranteeing that connecting part takes place the deformation, the shape of each bearing part 24 all can not change, has also guaranteed that the structure of radiation unit 1 can be stable all the time.
In one possible implementation manner, as shown in fig. 4, the flexible substrate may be an integral structure, that is, the first fixing portion 21, the second fixing portion 22, the annular connecting portion 23, and the bearing portion 24 may be an integral structure. Thus, the symmetry of the flexible substrate can be improved.
Fig. 5 shows a schematic plan structure of another flexible substrate according to an embodiment of the present disclosure. In a possible implementation manner, the shape of the vertical projection of the bearing portion 24 on the stretchable substrate 4 includes any one of a regular polygon such as a circle (as shown in fig. 1, 2 and 4), an ellipse, a square (as shown in fig. 5) and the like.
In a possible implementation, the shape of the radiation unit 1 includes any one of a circular spiral (as shown in fig. 1 and 2), an elliptical spiral, and a regular polygonal spiral.
The shape of the radiation unit 1 may be a shape matching the shape of the bearing portion 24, or may be other shapes such as a strip shape, a folded line shape, and the like, and the shape of the radiation unit 1 may be set according to the signal radiation requirement of the device, which is not limited in this disclosure.
In a possible implementation manner, the thickness of the flexible substrate may be 50 μm to 200 μm, the thickness of the radiation unit 1 may be 2 μm to 36 μm, and the thickness of the metal ground 5 may be 2 μm to 36 μm.
Fig. 6 illustrates a flow diagram of a method of manufacturing a flexible antenna apparatus according to an embodiment of the present disclosure. As shown in fig. 6, the method for manufacturing a flexible antenna device is used to manufacture the flexible antenna device, and includes steps S11 to S14.
In step S11, the flexible film is etched according to the determined shape and size of the flexible substrate, and a flexible substrate is obtained.
In step S12, a metal layer is generated on the flexible substrate.
In step S13, the metal layer is etched to form the radiating element and the first conductive line.
And in the process of etching the metal layer, the second lead and the metal ground can be formed simultaneously.
In step S14, the first fixing portion and the second fixing portion of the flexible substrate with the radiating element and the first conductive wire are fixedly mounted on the stretchable base having the pre-strain, resulting in the flexible antenna device.
In one possible implementation, step S14 may include any one of the following implementations:
in a first mode, the first fixing portion and the second fixing portion of the flexible substrate with the radiating element and the first wire are fixedly mounted on the stretchable base with the pre-strain, and the pre-stress of the stretchable base is released, so that the flexible antenna device is obtained.
And in a second mode, after the annular connecting part of the flexible substrate with the radiation unit and the first lead is bent, the first fixing part and the second fixing part are fixedly installed on the stretchable substrate with the pre-strain, so that the flexible antenna device is obtained.
And in a third mode, after the annular connecting part of the flexible substrate with the radiation unit and the first lead is bent, the first fixing part and the second fixing part are fixedly installed on the stretchable substrate with the pre-strain, and the pre-stress of the stretchable substrate is released to obtain the flexible antenna device.
In one possible implementation, the following step of manner four may also be performed after step S13 in place of step S14 described above. The method is as follows: and after the annular connecting part of the flexible substrate with the radiating unit and the first lead is bent, the first fixing part and the second fixing part are fixedly arranged on the stretchable substrate, so that the flexible antenna device is obtained.
Thus, the prepared flexible antenna device is the radiating unit suspended above the stretchable base under the action of the bearing part and other parts of the flexible substrate. In the subsequent operation of the flexible antenna device, the stretchable substrate is stretched or contracted under the action of an external force, so that the distance between the first fixing part and the second fixing part is changed, and the deformation of the annular connecting part drives the bearing part to be far away from or close to the stretchable substrate. Due to the symmetrical structure of the flexible substrate, the bearing part cannot deform in the moving process and in the moving stop state, adverse effects on the radiation unit cannot be naturally caused, and the stability of the radiation unit structure is ensured.
The manufacturing method of the flexible antenna device provided by the embodiment of the disclosure has the advantages of simple process and low cost, and the manufactured flexible antenna device
Through the arrangement of the flexible substrate, a 3D (three-dimensional) structure is formed when the device is stressed, the radiation unit is separated from the stretchable substrate, and the radiation unit is ensured not to deform and has stable resonant frequency. And, because flexible antenna device has stretchability, be applicable to the user demand of various flexible electronic systems.
To further illustrate the performance of the flexible antenna apparatus provided by the present disclosure in the operating state, fig. 7A-7E show schematic structural changes of the flexible antenna apparatus according to an embodiment of the present disclosure. Fig. 8 illustrates a schematic diagram of a resonant frequency change of a flexible antenna apparatus according to an embodiment of the present disclosure. In order to detect the performance of the flexible antenna device, the flexible antenna device may be manufactured by the manufacturing method described in the above "mode two". The finite element simulation sequentially releases 0% (as shown in fig. 7A), 25% (as shown in fig. 7B), 50% (as shown in fig. 7C), 75% (as shown in fig. 7D), and 100% (as shown in fig. 7E) of the pre-stress of the stretchable substrate 4, wherein the radiation unit 1 is positioned on the stretchable substrate 4 in contact with the stretchable substrate 4 when releasing 0% (as shown in fig. 7A) of the pre-stress of the stretchable substrate 4. The releasing of the prestress is to perform electromagnetic simulation on the flexible antenna device respectively at each prestress releasing percentage, and determine the corresponding relationship between the resonant frequency and the return loss of the radiation unit 1. As shown in fig. 8, the resonant frequency of the flexible antenna device (2.618 GHz as shown in fig. 8) is greatly affected by the electrical properties of the stretchable substrate 4 when 0% of the prestress of the stretchable substrate 4 is released, whereas the resonant frequency of the flexible antenna device hardly changes when the prestress of the stretchable substrate 4 is more than 0%, such as 25% (the resonant frequency of the flexible antenna device is 2.913GHz as shown in fig. 8), 50% (the resonant frequency of the flexible antenna device is 2.949GHz as shown in fig. 8), 75% (the resonant frequency of the flexible antenna device is 2.947GHz as shown in fig. 8), 100% (the resonant frequency of the flexible antenna device is 2.944GHz as shown in fig. 8). Therefore, the flexible antenna device provided by the disclosure has tensile property, and the radiation units have stable structures in the deformation process and after the deformation is finished and the structure is stable, and the resonant frequency of the radiation units is also kept stable.
Wherein the maximum principal strain of the flexible antenna arrangement is always detected to be less than 1% during the releasing of the pre-strain of the stretchable substrate 4. It is shown that the flexible antenna apparatus provided by the present disclosure is less strained when deformed under operational forces.
To further illustrate the performance of the flexible antenna apparatus provided by the present disclosure, the present disclosure also provides the following examples 1, 2.
Example 1:
the flexible antenna device shown in fig. 1 is manufactured according to the above manufacturing method, wherein the flexible substrate is a PI film and has a thickness of 100 micrometers, the radiating element 1, the first conducting wire 3, the second conducting wire 6, and the metal ground 5 are all copper foils and have a thickness of 12 micrometers, and the stretchable substrate 4 is a PDMS film. Through the finite element simulation process of the above fig. 7A-7E and 8, the maximum principal strain is less than 0.5%, and the resonance frequency deviation of the 3D buckling structure antenna obtained by using the structure is 0.04 GHz. The maximum deviation of the resonant frequency of the radiating unit in the stretching process of the manufactured flexible antenna device is less than 0.1GHz, which is similar to the simulation result.
Example 2:
the flexible antenna device shown in fig. 1 is manufactured according to the above manufacturing method, wherein the flexible substrate is a PI film and has a thickness of 150 μm, the radiating element 1, the first conducting wire 3, the second conducting wire 6, and the metal ground 5 are all copper foils and have a thickness of 9 μm, and the stretchable substrate 4 is an Ecoflex film. Through the finite element simulation process of the above fig. 7A-7E and 8, the maximum principal strain is less than 0.3%, and the resonant frequency deviation of the 3D buckling structure antenna obtained by using the structure is 0.05 GHz. The maximum deviation of the resonant frequency of the radiating unit in the stretching process of the manufactured flexible antenna device is less than 0.1GHz, which is similar to the simulation result.
It is further illustrated by the above examples 1 and 2 that the flexible antenna apparatus provided by the present disclosure has tensile properties, and the radiating element has a stable structure during the deformation of the apparatus and after the deformation is completed, and the resonant frequency thereof also remains stable.
It should be noted that, although the flexible antenna device and the manufacturing method thereof have been described above by taking the above-described embodiments as examples, those skilled in the art will understand that the present disclosure should not be limited thereto. In fact, the user can flexibly set each part and each step according to personal preference and/or actual application scene as long as the technical scheme of the disclosure is met.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A flexible antenna device, comprising: the radiating element, the flexible substrate with a symmetrical structure, the stretchable substrate and the first lead wire, wherein the flexible substrate comprises a first fixing part, a second fixing part, a bearing part and a ring-shaped connecting part matched with the bearing part in shape,
the first fixing part and the second fixing part are fixedly arranged on the stretchable substrate, and the annular connecting part is connected with the bearing part and the first fixing part and the second fixing part respectively;
the bearing part is used for bearing the radiation unit;
the first lead is positioned on the annular connecting part and the first fixing part, a first end of the first lead is connected to the radiating unit, and a second end of the first lead is used for being connected to external equipment;
the radiation unit is used for radiating the transmission signal from the external equipment into space for receiving by terminal equipment, and/or receiving the receiving signal from the terminal equipment, and sending the receiving signal to the external equipment through a first wire;
the annular connecting part deforms under the action of self deformation and/or deformation caused by external force of the stretchable substrate, so that the bearing part is far away from or close to the stretchable substrate.
2. The apparatus of claim 1, further comprising:
and the second lead is positioned on the annular connecting part and the second fixing part, and the second lead and the first lead form a symmetrical structure.
3. The apparatus of claim 1, further comprising:
at least one metal ground is mounted on the first fixing portion or the second fixing portion and serves as a ground of the device.
4. The device according to claim 1, wherein the annular connecting part is provided with one or two protruding parts at positions corresponding to the bearing part, the protruding parts are connected with the bearing part, and gaps with the same size are formed between the positions of the annular connecting part except the protruding parts and the bearing part.
5. The device of claim 1, wherein the flexible substrate is a unitary structure.
6. The device of claim 1, wherein the shape of the perpendicular projection of the carrying portion on the stretchable substrate comprises any one of a circle, an ellipse, and a regular polygon;
the shape of the radiation unit comprises any one of a circular spiral shape, an elliptical spiral shape and a regular polygonal spiral shape;
the number of the bearing parts comprises at least one, and when the number of the bearing parts is multiple, the multiple bearing parts form a symmetrical structure;
the flexible substrate further comprises at least one third fixing part, and the first fixing part, the second fixing part and the third fixing part form a symmetrical structure.
7. The apparatus of claim 1, wherein the flexible substrate has a thickness of 50 μm to 200 μm, the radiating element has a thickness of 2 μm to 36 μm, and the metal ground has a thickness of 2 μm to 36 μm.
8. A method of manufacturing a flexible antenna device, for manufacturing a flexible antenna device according to any of claims 1-7, the method comprising:
etching the flexible film according to the determined shape and size of the flexible substrate to obtain a flexible substrate;
generating a metal layer on the flexible substrate;
etching the metal layer to form a radiation unit and a first lead;
and fixedly mounting the first fixing part and the second fixing part of the flexible substrate with the radiating element and the first lead on the stretchable base with the pre-strain to obtain the flexible antenna device.
9. The method as claimed in claim 8, wherein the first fixing portion and the second fixing portion of the flexible substrate with the radiating element and the first conductive wire are fixedly mounted on the stretchable base having the pre-strain to obtain the flexible antenna device, comprising any one of the steps of:
fixedly mounting a first fixing part and a second fixing part of a flexible substrate with a radiating element and a first lead on a stretchable substrate with pre-strain, and releasing the pre-stress of the stretchable substrate to obtain a flexible antenna device;
after bending the annular connecting part of the flexible substrate with the radiating unit and the first lead, fixedly mounting the first fixing part and the second fixing part on a stretchable substrate with pre-strain to obtain a flexible antenna device;
after the annular connecting part of the flexible substrate with the radiating unit and the first lead is bent, the first fixing part and the second fixing part are fixedly installed on the stretchable substrate with the pre-strain, and the pre-stress of the stretchable substrate is released, so that the flexible antenna device is obtained.
10. The method of claim 8, further comprising:
and after the annular connecting part of the flexible substrate with the radiating unit and the first lead is bent, the first fixing part and the second fixing part are fixedly arranged on the stretchable substrate, so that the flexible antenna device is obtained.
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