Frequency-adjustable flexible antenna and manufacturing method thereof

Abstract

A frequency-tunable flexible antenna and its manufacturing method include a flexible base layer, a radiating patch, and a dielectric tunable capacitor. The radiating patch and the dielectric tunable capacitor are both disposed on the flexible base layer. The dielectric tunable capacitor includes a dielectric elastomer varactor, a first electrode sheet, and a second electrode sheet. The first and second electrode sheets are both electrically connected to the radiating patch. The dielectric elastomer varactor is disposed between the first and second electrode sheets. When a force is applied to the dielectric elastomer varactor, the capacitance of the dielectric tunable capacitor changes. This frequency-tunable flexible antenna can easily change the antenna's operating frequency.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible antennas, and in particular to a frequency-adjustable flexible antenna and a manufacturing method thereof. Background Art

[0002] Flexible antennas have been widely researched for their lightness, thinness, flexibility, and conformability. However, their electrical performance parameters, such as operating frequency and impedance matching, are affected by their electrical dimensions and shape. Once a flexible antenna is finalized, its performance parameters are fixed and rarely modifiable. This hinders the expansion of its performance.

[0003] In the prior art, various electrical performance parameters of a flexible antenna are generally changed by using a dielectric substrate with adjustable dielectric constant and adjusting the dielectric constant of the dielectric substrate by voltage. However, this method is relatively cumbersome.

[0004] Furthermore, when the flexible antenna is working, it will bend in some cases. When the flexible antenna bends, the size of the flexible antenna changes due to the bending strain, and the shape of the flexible antenna changes due to the bending deformation. The dielectric properties of its dielectric substrate, such as dielectric constant and dielectric loss, will be very different from those in the planar state. Once the flexible antenna is bent to a certain extent, it will not be able to work normally at the designed operating frequency, good impedance matching will not be achieved, and the standing wave will be relatively large, affecting the working efficiency of the antenna. Summary of the Invention

[0005] In view of this, the present invention provides a frequency-adjustable flexible antenna and a manufacturing method thereof, wherein the frequency-adjustable flexible antenna can easily change the operating frequency of the antenna.

[0006] The present invention provides a frequency-adjustable flexible antenna, comprising a flexible base layer, a radiating patch, and a dielectric adjustable capacitor, wherein the radiating patch and the dielectric adjustable capacitor are both arranged on the flexible base layer, and the dielectric adjustable capacitor comprises a dielectric elastomer varactor medium, a first electrode sheet, and a second electrode sheet, wherein the first electrode sheet and the second electrode sheet are both electrically connected to the radiating patch, and the dielectric elastomer varactor medium is arranged between the first electrode sheet and the second electrode sheet, and when the dielectric elastomer varactor medium is subjected to an applied force, the capacitance value of the dielectric adjustable capacitor changes.

[0007] Furthermore, the first electrode sheet and the second electrode sheet are parallel to each other, the plane where the first electrode sheet and the second electrode sheet are located and the plane where the extension direction of the radiation patch connected to the first electrode sheet and the second electrode sheet is located are parallel to each other, and the plane where the first electrode sheet and the second electrode sheet are located is perpendicular to the plane where the flexible substrate layer is located.

[0008] Furthermore, the first electrode sheet and the second electrode sheet are respectively disposed on the upper side and the lower side of the dielectric elastomer varactor.

[0009] Furthermore, the first electrode sheet and the second electrode sheet are parallel to each other, the plane where the first electrode sheet and the second electrode sheet are located and the plane where the extension direction of the radiation patch connected to the first electrode sheet and the second electrode sheet is located are perpendicular to each other, and the plane where the first electrode sheet and the second electrode sheet are located is perpendicular to the plane where the flexible substrate layer is located.

[0010] Furthermore, a gap is formed between the first electrode sheet and the second electrode sheet and the end faces of the radiation patch to which they are connected.

[0011] Furthermore, a force applying module and a control unit are provided for applying force to the dielectric adjustable capacitor. The force applying module is electrically connected to the control unit, and the control unit controls the magnitude of the force applied to the dielectric adjustable capacitor through the force applying module.

[0012] Furthermore, the frequency-adjustable flexible antenna includes a bending shape detection module for detecting the bending shape of the flexible base layer. The bending shape detection module is electrically connected to the control unit and transmits the bending shape information of the flexible base layer to the control unit. The control unit controls the force applied to the dielectric adjustable capacitor according to the bending shape of the flexible base layer.

[0013] The Young's modulus of the flexible base layer is greater than the Young's modulus of the dielectric elastomer varactor medium, the Young's modulus of the flexible base layer is not less than 1 MPa, and the Young's modulus of the dielectric elastomer varactor medium is not more than 10 MPa.

[0014] Furthermore, the frequency-adjustable flexible antenna further includes a packaging layer, and the packaging layer packages the radiation patch and the dielectric adjustable capacitor on the flexible base layer.

[0015] The present invention also provides a method for manufacturing a frequency-adjustable flexible antenna, which is characterized in that the method comprises:

[0016] S1: making a flexible base layer;

[0017] S2: Fabricate a dielectric elastomer varactor medium, a first electrode sheet, a second electrode sheet, and a radiation patch on the flexible base layer, such that the first electrode sheet and the second electrode sheet are disposed on both sides of the dielectric elastomer varactor medium and are electrically connected to the radiation patch.

[0018] In summary, the present invention provides a dielectric adjustable capacitor on the flexible base layer. When the dielectric adjustable capacitor is subjected to an applied force, its capacitance value changes, thereby conveniently changing the operating frequency of the frequency adjustable flexible antenna.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG2 is a schematic diagram of a top view of the frequency-adjustable flexible antenna provided in the first embodiment of the present invention.

[0021] Figure 2 Shown Figure 1 Schematic diagram of the cross-sectional structure along the II-II direction.

[0022] Figure 3 FIG2 is a schematic diagram of the cross-sectional structure of a frequency-adjustable flexible antenna provided by the second embodiment of the present invention.

[0023] Figure 4 FIG2 is a schematic diagram of a top view of the frequency-adjustable flexible antenna provided in the third embodiment of the present invention.

[0024] Figure 5 FIG. 4 is a system block diagram of a frequency-adjustable flexible antenna provided by a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description with reference to the accompanying drawings and preferred embodiments.

[0026] The present invention provides a frequency-adjustable flexible antenna and a manufacturing method thereof. The frequency-adjustable flexible antenna can easily change the working frequency of the antenna.

[0027] Figure 1 FIG. 1 is a schematic diagram of a top view of the frequency-adjustable flexible antenna provided by the first embodiment of the present invention. Figure 2 Shown Figure 1 Schematic diagram of the cross-sectional structure in the II-II direction. It should be noted that, in order to facilitate observation, Figure 1 The encapsulation layer is omitted, such as Figure 1 and Figure 2As shown, the frequency-adjustable flexible antenna provided in this embodiment includes a flexible base layer 10, a radiating patch 21 and a dielectric adjustable capacitor 30. The radiating patch 21 and the dielectric adjustable capacitor 30 are both arranged on the flexible base layer 10. The dielectric adjustable capacitor 30 includes a dielectric elastomer varactor 31, a first electrode sheet 32 ​​and a second electrode sheet 33. The first electrode sheet 32 ​​and the second electrode sheet 33 are both electrically connected to the radiating patch 21. The dielectric elastomer varactor 31 is arranged between the first electrode sheet 32 ​​and the second electrode sheet 33. When the dielectric elastomer varactor 31 is subjected to an external force, the capacitance value of the dielectric adjustable capacitor 30 changes.

[0028] Since the operating frequency of a flexible antenna is primarily affected by capacitance and inductance, reducing the capacitance and inductance will shift the operating frequency toward higher frequencies, but the impedance matching will also change. In this embodiment, by providing a dielectric adjustable capacitor 30 and disposing a dielectric elastomer varactor 31 within the dielectric adjustable capacitor 30, when a force is applied to the dielectric elastomer varactor 31, the thickness of the dielectric elastomer varactor 31 can be changed, thereby changing the capacitance of the dielectric adjustable capacitor 30. This can thus change the operating frequency of the antenna. Furthermore, since the impedance matching of the dielectric adjustable capacitor 30 also changes during the process of changing its capacitance, this can also improve the radiation efficiency of the flexible antenna.

[0029] In this embodiment, the position of the dielectric adjustable capacitor 30 can be selected at a position where the frequency change rate or impedance change rate of the frequency adjustable flexible antenna is larger when a unit force is applied, that is, an area where its frequency or impedance is more sensitive, and this position can be obtained by measurement.

[0030] Furthermore, if Figure 1 As shown, in this embodiment, the first electrode sheet 32 ​​and the second electrode sheet 33 are parallel to each other, the plane where the first electrode sheet 32 ​​and the second electrode sheet 33 are located and the plane where the extension direction of the radiation patch 21 connected to the first electrode sheet 32 ​​and the second electrode sheet 33 is located are parallel to each other, and are perpendicular to the plane where the flexible base layer 10 is located.

[0031] In this embodiment, a force may be applied to the dielectric elastomer varactor medium 31, preferably as follows: Figure 1 As shown in , the force perpendicular to the plane direction of the first electrode sheet 32 ​​and the second electrode sheet 33 can adjust the dielectric adjustable capacitor 30.

[0032] In this embodiment, the Young's modulus of the flexible base layer 10 is greater than the Young's modulus of the dielectric elastomer varactor 31, that is, the dielectric elastomer varactor 31 can be deformed relatively easily under the action of an applied force, and can easily restore its shape after the applied force is removed. The flexible base layer 10 can remain straight when not subjected to an applied force. Preferably, the Young's modulus of the flexible base layer 10 is not less than 1 MPa, while the Young's modulus of the dielectric elastomer varactor 31 is not more than 10 MPa. Furthermore, the dielectric elastomer varactor 31 can be made of materials such as PDMS (dimethylsiloxane) and TPU (polyurethane). In order to make the dielectric elastomer varactor 31 have a lower Young's modulus. In this embodiment, when the dielectric elastomer volatilizer medium 31 is PDMS, the ratio of the prepolymer to the curing agent of the PDMS slurry does not exceed 10:1. For example, it can be selected from 10:1, 8:1, 5:1, etc., and then cured at a temperature of 60-120°C for 1-4 hours to form; when the dielectric elastomer volatilizer medium 31 is TPU, polyurethane resin particles with a Young's modulus less than 10MPa can be selected and dissolved in a DMF (dimethylformamide) solution accounting for 5%-10% of the total solution mass, and then the solvent is evaporated and then formed.

[0033] In order to make the flexible base layer 10 have a higher Young's modulus, when the flexible base layer 10 is PDMS, the ratio of the prepolymer to the curing agent of the PDMS slurry is greater than 10:1, such as 15:1, 20:1, etc., and then cured at a temperature of 60-120°C for 1-4h to form; when the flexible base layer 10 is TPU, polyurethane resin particles with a Young's modulus greater than 10MPa can be selected and dissolved in a DMF (dimethylformamide) solvent accounting for 5%-10% of the total solution mass, and then the solvent is evaporated before molding.

[0034] Furthermore, in this embodiment, a ground metal layer 22 is provided on the flexible base layer 10, and is spaced apart from the radiating patch 21. The ground metal layer 22, the radiating patch 21, the first electrode sheet 32, and the second electrode sheet 33 can all be 3D printed from materials such as silver, copper, aluminum, and gold.

[0035] Furthermore, in this embodiment, the frequency-tunable flexible antenna also includes an encapsulation layer 40, which encapsulates the radiating patch 21, the dielectric tunable capacitor 30, and the ground metal layer 22 on the flexible base layer 10. Similar to the dielectric elastomer varactor 31, the encapsulation layer 40 can also be made of a material with a low Young's modulus to facilitate force transmission.

[0036] In another embodiment, the radiation patch 21 , the first electrode sheet 32 ​​, the second electrode sheet 33 and the ground metal layer 22 may be cut and shaped by a laser cutting process first, and then transferred to the flexible base layer 10 .

[0037] Figure 3 FIG. 1 is a schematic diagram of the cross-sectional structure of a frequency-adjustable flexible antenna provided by the second embodiment of the present invention. Figure 3 As shown, the second embodiment of the present invention is basically the same as the first embodiment, except that, in this embodiment, the plane where the first electrode sheet 32 ​​and the second electrode sheet 33 are located is parallel to the plane where the flexible base layer 10 is located, that is, the first electrode sheet 32 ​​and the second electrode sheet 33 are arranged on the upper side and the lower side of the dielectric elastomer.

[0038] Figure 4 FIG. 1 is a schematic diagram of a top view of a frequency-adjustable flexible antenna according to a third embodiment of the present invention. Figure 4 As shown, the frequency-adjustable flexible antenna provided by the third embodiment of the present invention is basically the same as the first embodiment, except that, in this embodiment, the plane where the first electrode sheet 32 ​​and the second electrode sheet 33 are located and the extension direction of the radiation patch 21 connected to the first electrode sheet 32 ​​and the second electrode sheet 33 are perpendicular to each other, and are both perpendicular to the plane where the flexible base layer 10 is located, that is, the first electrode sheet 32 ​​and the second electrode sheet 33 are both arranged at the end of the radiation patch 21 connected to each other.

[0039] Furthermore, gaps 34 are provided between the first electrode sheet 32 ​​and the second electrode sheet 33 and the ends of the radiation patches 21 to which they are connected, for facilitating application of a force.

[0040] It can be understood that on the same flexible base layer 10 , the number of the dielectric adjustable capacitors 30 can be one or more, and the structures can be the same or different.

[0041] Figure 5 FIG. 1 is a system block diagram of a frequency-adjustable flexible antenna provided by the fourth embodiment of the present invention. Figure 5 As shown, the structure of the frequency-adjustable flexible antenna provided in the fourth embodiment of the present invention can be applied to all the above embodiments. The frequency-adjustable flexible antenna also includes a force-applying module 51 and a control unit 52 for applying a force to the dielectric adjustable capacitor 30. The force-applying module 51 is electrically connected to the control unit 52, and the control unit 52 controls the magnitude of the force applied to the dielectric adjustable capacitor 30 through the force-applying module 51.

[0042] In this embodiment, the force applying module 51 and the control unit 52 are configured to adjust the force applied to the dielectric adjustable capacitor 30 as needed, thereby changing the capacitance of the dielectric adjustable capacitor 30 as needed, and subsequently adjusting the frequency of the entire flexible antenna as needed. Preferably, the direction in which the force applying module 51 applies the force is perpendicular to the plane in which the first electrode sheet 32 ​​and the second electrode sheet 33 are located.

[0043] Furthermore, in this embodiment, the frequency-adjustable flexible antenna also includes a bending shape detection module 53 for detecting the bending shape, such as curvature, of the flexible base layer 10. The bending shape detection module 53 is electrically connected to the control unit 52 and transmits the bending shape information of the flexible base layer 10 to the control unit 52. The control unit 52 controls the magnitude of the force applied to the dielectric adjustable capacitor 30 according to the bending shape of the flexible base layer 10.

[0044] Since the operating frequency of the frequency-adjustable flexible antenna will change when it is in a bent state, the bending shape of the flexible base layer 10 can be obtained through the setting of the bending shape detection module 53. The control unit 52 controls the magnitude of the force applied by the force application module 51 according to the bending shape of the flexible base layer 10, and then changes the capacitance value of the dielectric adjustable capacitor 30, so that the frequency-adjustable flexible antenna can adjust the operating frequency of the frequency-adjustable flexible antenna as needed when it is bent, or maintain the stability of its working state.

[0045] In this embodiment, a working frequency table of the same frequency-adjustable flexible antenna can be established in advance, and a corresponding relationship curve between the bending shape of the flexible base layer 10 and the magnitude of the force applied by the force-applying module 51 can be stored in the control unit 52 so that the control unit 52 can control the magnitude of the force applied by the force-applying module 51 according to the bending shape of the flexible base layer 10.

[0046] In summary, the present invention provides a dielectric adjustable capacitor 30 on the flexible base layer 10. When the dielectric adjustable capacitor 30 is subjected to an applied force, its capacitance value changes, thereby conveniently changing the operating frequency of the frequency adjustable flexible antenna.

[0047] The present invention also provides a method for manufacturing a frequency-adjustable flexible antenna, the method comprising the following steps:

[0048] S1: preparing a flexible base layer 10;

[0049] S2: Fabricate a dielectric elastomer varactor 31, a first electrode sheet 32, a second electrode sheet 33, and a radiation patch 21 on the flexible base layer 10, such that the first electrode sheet 32 ​​and the second electrode sheet 33 are disposed on both sides of the dielectric elastomer varactor 31 and are electrically connected to the radiation patch 21;

[0050] S3 : manufacturing a packaging layer 40 so that the packaging layer 40 packages the radiation patch 21 , the dielectric elastomer varactor 31 , the first electrode sheet 32 ​​and the second electrode sheet 33 on the flexible base layer 10 .

[0051] Furthermore, when manufacturing the flexible base layer 10, the method further includes:

[0052] S11: preparing a slurry for the flexible base layer 10;

[0053] In this embodiment, the slurry of the flexible base layer 10 may include PDMS prepolymer and a curing agent. In the case of PDMS, the ratio of the prepolymer to the curing agent in the PDMS slurry is greater than 10:1, such as 15:1, 20:1, etc.; in another embodiment, it can also be polyurethane resin particles with a Young's modulus greater than 10 MPa and a solvent. Taking DMF as an example, the solvent accounts for 5%-10% of the total solution mass.

[0054] S12: preparing a flexible base layer 10 by using a flexible base layer 10 slurry.

[0055] In this embodiment, the flexible base layer 10 can be made by a mold method, and the curing temperature can be 60-120° C., and the curing time can be 1-4 hours. In other embodiments, the flexible base layer 10 can also be formed by 3D printing.

[0056] When forming the dielectric elastomer varactor medium 31, the following steps may be included:

[0057] S211: preparing dielectric elastomer volatilizer 31 slurry;

[0058] In this embodiment, the slurry of the dielectric elastomer volatilizer 31 may include PDMS prepolymer and a curing agent, and the ratio of the prepolymer to the curing agent of the DMS slurry does not exceed 10:1. For example, it can be selected from 10:1, 8:1, 5:1, etc. In other embodiments, it can also be polyurethane resin particles with a Young's modulus less than 10 MPa and a solvent. Taking DMF as an example, the solvent accounts for 5%-10% of the total solution mass.

[0059] S212 : forming a dielectric elastomer varactor medium 31 on the flexible base layer 10 .

[0060] In this embodiment, the dielectric elastic medium can be formed on the flexible base layer 10 by a mold method; in another embodiment, it can be directly formed by a 3D printing process.

[0061] Furthermore, when forming the first electrode sheet 32 ​​, the second electrode sheet 33 and the radiation patch 21 , they can be directly formed by a 3D printing process, or the required metal pattern can be first formed by a laser cutting process and then transferred to the flexible base layer 10 .

[0062] The following describes a method for manufacturing a frequency-adjustable flexible antenna using a specific embodiment:

[0063] Example 1

[0064] 20g of PDMS prepolymer and curing agent were mixed at a ratio of 10:1 and 20:1, respectively, to form slurries for the high-modulus and low-modulus PDMS substrates and the dielectric elastomer varactor 31. The high-modulus PDMS slurry was formed into a film using a 0.5mm mold and cured at 60°C for 4 hours. This film served as the flexible base layer 10. The low-modulus PDMS slurry was then applied to its surface through a mold process and cured at 60°C for 4 hours to form the dielectric elastomer varactor 31.

[0065] Using silver paste as the metal paste, a metal pattern is printed on the surface of the flexible base layer 10 and the side of the dielectric elastomer varactor 31 via a 3D printing process. The pattern is then cured at 80°C for 2 hours to form the radiating patch 21, the first electrode 32, and the second electrode 33. The low-modulus PDMS slurry is then applied to the first and second electrode 32, 33, and radiating patch 21 via a 3D printing process and cured at 60°C for 4 hours to form an encapsulation layer 40 with a thickness of 25 microns. Applying pressure on both sides of the dielectric tunable capacitor 30 changes the capacitance, enabling continuous adjustment of the antenna within the 2.4-3.5 GHz range. The antenna has a bending radius of 10 mm and can withstand 1,000 bends.

[0066] Example 2

[0067] 20g of PDMS prepolymer and curing agent were mixed at a ratio of 8:1 and 15:1, respectively, to form the slurries for the high-modulus and low-modulus PDMS substrates and varactor. The high-modulus PDMS slurry was formed through a 0.2mm mold and cured at 80°C for 2 hours to form a film. This film served as the flexible substrate layer 10. The low-modulus PDMS slurry was then applied to its surface through a mold process and cured at 80°C for 2 hours to form the dielectric elastomer varactor 31.

[0068] Using 2-micron copper foil as the metal material, the desired pattern is formed by laser cutting. This copper foil is then transferred to the surface of the flexible base layer 10 and the sides of the dielectric elastomer varactor 31 via a transfer printing process to form a metal pattern. The low-modulus PDMS slurry is then applied to the first and second electrode sheets 32, 33, and radiating patch 21 via a 3D printing process. The slurry is then cured at 60°C for 4 hours to form a 10-micron thick encapsulation layer 40. Applying pressure on both sides of the dielectric tunable capacitor 30 changes the capacitance, enabling continuous adjustment of the antenna within the 2.4-4 GHz range. The antenna has a bending radius of 2 mm and can withstand 10,000 bends.

[0069] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A frequency-adjustable flexible antenna, characterized by: The flexible antenna comprises a flexible base layer, a radiation patch and a dielectric adjustable capacitor, wherein the radiation patch and the dielectric adjustable capacitor are both arranged on the flexible base layer, the dielectric adjustable capacitor comprises a dielectric elastomer varactor, a first electrode sheet and a second electrode sheet, the first electrode sheet and the second electrode sheet are both electrically connected to the radiation patch, the dielectric elastomer varactor is arranged between the first electrode sheet and the second electrode sheet, and the dielectric elastomer varactor changes the capacitance value of the dielectric adjustable capacitor when subjected to an applied force, and the frequency adjustable flexible antenna further comprises a dielectric adjustable capacitor applied to the dielectric adjustable capacitor. A force-applying module and a control unit for applying a force, the force-applying module is electrically connected to the control unit, the control unit controls the magnitude of the force applied to the dielectric adjustable capacitor through the force-applying module, the frequency-adjustable flexible antenna includes a bending shape detection module for detecting the bending shape of the flexible substrate layer, the bending shape detection module is electrically connected to the control unit, and transmits the bending shape information of the flexible substrate layer to the control unit, and the control unit controls the force applied to the dielectric adjustable capacitor according to the bending shape of the flexible substrate layer.

2. The frequency-adjustable flexible antenna according to claim 1, wherein: The first electrode sheet and the second electrode sheet are parallel to each other, the plane where the first electrode sheet and the second electrode sheet are located and the plane where the extension direction of the radiation patch connected to the first electrode sheet and the second electrode sheet is located are parallel to each other, and the plane where the first electrode sheet and the second electrode sheet are located is perpendicular to the plane where the flexible substrate layer is located.

3. The frequency-adjustable flexible antenna according to claim 1, wherein: The first electrode sheet and the second electrode sheet are respectively disposed on the upper side and the lower side of the dielectric elastomer varactor.

4. The frequency-adjustable flexible antenna according to claim 1, wherein: The first electrode sheet and the second electrode sheet are parallel to each other, the plane where the first electrode sheet and the second electrode sheet are located is perpendicular to the plane where the extension direction of the radiation patch connected to the first electrode sheet and the second electrode sheet is located, and the plane where the first electrode sheet and the second electrode sheet are located is perpendicular to the plane where the flexible substrate layer is located.

5. The frequency-adjustable flexible antenna according to claim 4, wherein: A gap is formed between the first electrode sheet and the second electrode sheet and the end surface of the radiation patch to which they are connected.

6. The frequency-adjustable flexible antenna according to claim 1, wherein: The Young's modulus of the flexible base layer is greater than the Young's modulus of the dielectric elastomer varactor medium, the Young's modulus of the flexible base layer is not less than 1 MPa, and the Young's modulus of the dielectric elastomer varactor medium is not more than 10 MPa.

7. The frequency-adjustable flexible antenna according to claim 1, wherein: The frequency-adjustable flexible antenna further includes a packaging layer, which packages the radiation patch and the dielectric adjustable capacitor on the flexible base layer.

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