Composite substrate and manufacturing method thereof

Abstract

A composite substrate is provided which includes an elastic polymer matrix formed of an elastic polymer having elasticity, and dielectric clusters of a predetermined shape which are contained in the polymer matrix and formed from a dielectric powder having dielectric properties, and in which, when the substrate stretches or contracts, the predetermined shape of the dielectric clusters changes, thereby varying the dielectric constant.

Description

[Technical Field]

[0001] The present invention relates to a composite substrate and a manufacturing method thereof, and more particularly to a composite substrate having elasticity and dielectricity, and in which the dielectric constant decreases substantially linearly when stretched in an elongated direction, and a manufacturing method thereof. [Background technology]

[0002] In the past, metal materials have been used in dielectric manufacturing methods. For example, Korean Patent Publication No. 10-2010-0011023 discloses a method for forming a high-dielectric film made of a metal oxide by repeating one or more cycles including the steps of: injecting a metal precursor into a reaction chamber to form an adsorption layer of the metal precursor on a substrate, fuzzing the metal precursor remaining in the reaction chamber, generating oxygen plasma in a showerhead in the reaction chamber to react with the adsorption layer of the metal precursor, and fuzzing gases and reaction by-products remaining in the reaction chamber.

[0003] Meanwhile, metal-based dielectrics have recently been required to have stretchability for application in stretchable systems, where the term "stretchable system" refers to a system having flexibility, and may include, for example, wearable devices.

[0004] However, as mentioned above, if the dielectric is based only on a metal material, it is obvious that it is difficult to have elasticity.

[0005] Dielectrics containing a material having elasticity, such as a polymeric elastomer, together with the above-mentioned metal material have been developed. For example, Korean Patent Publication No. 10-2017-0017612 discloses a polymeric dielectric composition containing a conductive filler in a polymeric elastomer, wherein the conductive filler contains a dispersant represented by the following Chemical Formula 1:

[0006] [Chemical formula 1] CX3(CX2)nY Here, X is H or F, Y is H, NH2, OH, COOH, or SiR1R2R3, n is an integer of 1 to 30, and R1, R2, and R3 are the same or different and are H, F, Cl, Br, an alkyl group having 1 to 10 carbon atoms, an alkoxide group having 1 to 10 carbon atoms, an alkenyl group having 1 to 10 carbon atoms, an alkane group having 1 to 10 carbon atoms, an allyl group having 1 to 30 carbon atoms, a cycloalkyl group having 1 to 30 carbon atoms, or a cycloalkenyl group having 1 to 30 carbon atoms.

[0007] However, conventional stretchable dielectrics can change their dielectric constant randomly when stretched.

[0008] As described above, such conventional stretchable dielectrics have irregular changes in dielectric constant, making them difficult to apply as substrates in stretchable systems.

[0009] This is because the high frequency elements of the stretchable system, such as antennas, capacitors, inductors, and circuits, must maintain their frequencies within certain ranges.

[0010] However, as described above, when conventional elastic dielectrics are stretched or contracted, the dielectric constant changes irregularly, and therefore the frequency of high frequency devices can change rather than being maintained within a predetermined range.

[0011] Therefore, the current situation is that a substrate whose dielectric constant changes substantially linearly when it expands and contracts is required. Summary of the Invention [Problem to be solved by the invention]

[0012] SUMMARY OF THE INVENTION An object of the present invention is to provide a composite substrate in which the dielectric constant decreases substantially linearly and rapidly when stretched in the elongation direction, and a method for manufacturing the same.

[0013] Another object of the present invention is to provide a composite substrate having excellent thermal conductivity and a method for manufacturing the same.

[0014] Another object of the present invention is to provide a composite substrate applicable to high frequency devices of a stretchable system and a manufacturing method thereof.

[0015] The object of the present invention is not limited to the above. [Means for solving the problem]

[0016] To achieve the above object, the present invention provides a composite substrate.

[0017] In one aspect, the composite substrate includes an elastic polymer matrix formed of an elastic polymer having elasticity, and dielectric clusters of a predetermined shape formed from a dielectric powder having dielectric properties contained in the polymer matrix, and is characterized in that when the composite substrate expands or contracts, the predetermined shape of the dielectric clusters changes, thereby varying the dielectric constant.

[0018] When the stretching proceeds in the stretching direction, the predetermined shape of the dielectric clusters changes such that the number of the dielectric powders per unit volume of the stretchable polymer matrix decreases, and the dielectric constant decreases linearly.

[0019] The variable dielectric constant range is within an expansion / contraction range of 0.1% to 30%, and the variable dielectric constant range is 1.5 to 7.5.

[0020] The dielectric constant decreases at a gradient of 0.03 to 0.08 in the expansion / contraction range of 0.1% to 30%.

[0021] It has a thermal conductivity of 0.1 W / mk or more and 10 W / mk or less.

[0022] The elastic polymer is a silicon-based material, and the silicon-based material includes at least one selected from the group consisting of ecoflex, PDMS (polydimethylsiloxane), and SEBS (Styrene-Ethylene-Butylene-Styrene)-containing materials.

[0023] The dielectric powder is a metal oxide-based material, and is at least one selected from the group consisting of barium titanate, strontium titanate, and aluminum oxide.

[0024] To achieve the above object, the present invention provides a method for manufacturing a composite substrate.

[0025] According to one aspect, the method for manufacturing the composite substrate includes the steps of: dispersing an elastic polymer having elasticity in a solvent to prepare a source solution; mixing a dielectric powder having dielectric properties into the source solution to prepare a dielectric source; providing a catalyst in the dielectric source that generates an attractive force between the dielectric powder to form dielectric clusters of a predetermined shape from the dielectric powder; and curing the dielectric source with the dielectric clusters formed therein to manufacture a composite substrate in which the dielectric clusters are dispersed in an elastic polymer matrix formed from the elastic polymer.

[0026] In the step of forming the dielectric clusters, the catalyst is provided to the dielectric source by a dropwise method, and the catalyst is water.

[0027] In the step of preparing the source solution, the solvent is a polar liquid immiscible with water, the polar liquid including dichloromethane, the elastic polymer is a silicon-based material, and the silicon-based material includes at least one selected from the group consisting of Ecoflex, PDMS, and SEBS.

[0028] To achieve the above object, the present invention provides a composite substrate.

[0029] According to one aspect, the composite substrate includes an elastic polymer matrix formed of an elastic polymer having elasticity, and dielectric clusters of a predetermined shape formed from a dielectric powder having dielectric properties and contained in the polymer matrix. When the composite substrate stretches, the predetermined shape of the dielectric clusters changes, thereby varying the dielectric constant, and the variable dielectric constant range is 0.1% to 30%. The variable dielectric constant range is 1.5 to 7.5, and the dielectric constant decreases at a gradient of 0.03 to 0.08 within the stretch range of 0.1% to 30%. [Effects of the Invention]

[0030] According to the present invention, a composite substrate can be provided which includes an elastic polymer matrix formed of an elastic polymer having elasticity, and dielectric clusters of a predetermined shape formed from a dielectric powder having dielectric properties contained in the polymer matrix, and in which, when the substrate stretches or contracts, the predetermined shape of the dielectric clusters changes, thereby varying the dielectric constant.

[0031] More specifically, when the stretching proceeds in the elongation direction, the predetermined shape of the dielectric clusters may change such that the number of the dielectric powders per unit volume of the stretchable polymer matrix decreases.

[0032] This allows the dielectric constant to decrease substantially linearly and rapidly as the stretching proceeds in the stretching direction.

[0033] Therefore, according to the present invention, the composite substrate has excellent frequency characteristics when applied to a high-frequency device of a stretchable system.

[0034] Meanwhile, according to the present invention, the composite substrate has excellent thermal conductivity since it contains the dielectric powder.

[0035] Therefore, according to the present invention, the composite substrate has excellent thermal conductivity when applied to a high frequency device of a stretchable system. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is a diagram illustrating a composite substrate according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram for explaining a method for manufacturing a composite substrate according to an embodiment of the present invention. [Figure 3] FIG. 3 is a diagram illustrating a method for manufacturing a composite substrate according to an embodiment of the present invention. [Figure 4] FIG. 4 is a diagram illustrating a method for manufacturing a composite substrate according to an embodiment of the present invention. [Figure 5] FIG. 5 is a diagram illustrating a method for manufacturing a composite substrate according to an embodiment of the present invention. [Figure 6] FIG. 6 is a diagram illustrating a method for manufacturing a composite substrate according to an embodiment of the present invention. [Figure 7] FIG. 7 is a diagram illustrating a method for manufacturing a composite substrate according to an embodiment of the present invention. [Figure 8] FIG. 8 is a diagram for explaining an experimental example of the present invention. [Figure 9] FIG. 9 is a diagram for explaining an experimental example of the present invention. [Figure 10] FIG. 10 is a diagram for explaining an experimental example of the present invention. [Figure 11] FIG. 11 is a diagram for explaining an experimental example of the present invention. [Figure 12] FIG. 12 is a diagram for explaining an experimental example of the present invention. [Figure 13] FIG. 13 is a diagram for explaining an experimental example of the present invention. [Figure 14] FIG. 14 is a diagram for explaining an experimental example of the present invention. [Figure 15] FIG. 15 is a diagram for explaining an experimental example of the present invention. [Figure 16] FIG. 16 is a diagram for explaining an experimental example of the present invention. [Figure 17] FIG. 17 is a diagram for explaining an experimental example of the present invention. [Figure 18] FIG. 18 is a diagram for explaining an experimental example of the present invention. [Figure 19] FIG. 19 is a diagram for explaining an experimental example of the present invention. [Figure 20] FIG. 20 is a diagram for explaining an experimental example of the present invention. [Figure 21] FIG. 21 is a diagram for explaining an experimental example of the present invention. [Figure 22] FIG. 22 is a diagram for explaining an experimental example of the present invention. [Figure 23] FIG. 23 is a diagram for explaining an experimental example of the present invention. [Figure 24] FIG. 24 is a diagram for explaining an experimental example of the present invention. [Figure 25] FIG. 25 is a diagram for explaining an experimental example of the present invention. [Figure 26] FIG. 26 is a diagram for explaining an experimental example of the present invention. [Figure 27] FIG. 27 is a diagram for explaining an experimental example of the present invention. [Figure 28] FIG. 28 is a diagram for explaining an experimental example of the present invention. [Figure 29] FIG. 29 is a diagram for explaining an experimental example of the present invention. [Figure 30] FIG. 30 is a diagram for explaining an experimental example of the present invention. [Figure 31] FIG. 31 is a diagram for explaining an experimental example of the present invention. [Figure 32] FIG. 32 is a diagram for explaining an experimental example of the present invention. [Figure 33] FIG. 33 is a diagram for explaining an experimental example of the present invention. [Figure 34] FIG. 34 is a diagram for explaining an experimental example of the present invention. [Figure 35]FIG. 35 is a diagram for explaining an experimental example of the present invention. [Figure 36] FIG. 36 is a diagram for explaining an experimental example of the present invention. [Figure 37] FIG. 37 is a diagram for explaining an experimental example of the present invention. [Figure 38] FIG. 38 is a diagram for explaining an experimental example of the present invention. [Figure 39] FIG. 39 is a diagram for explaining an experimental example of the present invention. [Figure 40] FIG. 40 is a diagram for explaining an experimental example of the present invention. [Figure 41] FIG. 41 is a diagram for explaining an experimental example of the present invention. [Figure 42] FIG. 42 is a diagram for explaining an experimental example of the present invention. [Figure 43] FIG. 43 is a diagram for explaining an experimental example of the present invention. [Figure 44] FIG. 44 is a diagram for explaining an experimental example of the present invention. [Figure 45] FIG. 45 is a diagram for explaining an experimental example of the present invention. [Figure 46] FIG. 46 is a diagram for explaining an experimental example of the present invention. [Figure 47] FIG. 47 is a diagram for explaining an experimental example of the present invention. [Figure 48] FIG. 48 is a diagram for explaining an experimental example of the present invention. [Figure 49] FIG. 49 is a diagram for explaining an experimental example of the present invention. [Figure 50] FIG. 50 is a diagram for explaining an experimental example of the present invention. [Figure 51] FIG. 51 is a diagram for explaining an experimental example of the present invention. [Figure 52] FIG. 52 is a diagram for explaining an experimental example of the present invention. [Figure 53] FIG. 53 is a diagram for explaining an experimental example of the present invention. [Figure 54] FIG. 54 is a diagram for explaining an experimental example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical concept of the present invention is not limited to the embodiments described herein and may be embodied in other forms. The embodiments described herein are provided so that the disclosure will be thorough and complete, and so that the concept of the present invention will be fully conveyed to those skilled in the art.

[0038] In this specification, when a component is described as being on another component, it means that it can be directly formed on the other component, or a third component can be sandwiched between them. Also, in the drawings, shapes and sizes are exaggerated for the purpose of effectively explaining the technical content.

[0039] Furthermore, in various embodiments of this specification, terms such as "first," "second," and "third" are used to describe various components, but these components should not be limited by such terms. These terms are used merely to distinguish one component from another. Thus, what is referred to as a "first" component in one embodiment may be referred to as a "second" component in another embodiment. Each embodiment described and exemplified herein also includes its complementary embodiment. Furthermore, in this specification, "and / or" is used to mean that at least one of the components listed before and after it is included.

[0040] In this specification, the singular expression includes the plural expression unless the context clearly dictates otherwise. Furthermore, the terms "comprise" or "have" are intended to specify the presence of a feature, number, step, component, or combination thereof described in the specification, and should not be understood to exclude the presence or possibility of addition of one or more other features, numbers, steps, components, or combinations thereof. Furthermore, in this specification, the term "coupled" is used to mean both indirectly and directly coupling multiple components.

[0041] Furthermore, terms such as "unit," "device," and "module" used in the specification refer to a unit that processes at least one function or operation, and can be embodied as hardware, software, or a combination of hardware and software.

[0042] Furthermore, when describing the present invention, if a detailed description of related publicly known functions or configurations is deemed to unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

[0043] Conventionally, metal materials are used in the manufacturing of dielectrics.

[0044] Meanwhile, metal-based dielectrics as described above are now being required to have stretchability in order to be applied to stretchable systems. Here, the term "stretchable system" refers to a system having flexibility, and may include, for example, wearable devices.

[0045] However, as mentioned above, if the dielectric is based only on a metal material, it is obvious that it is difficult to have elasticity.

[0046] To address this, dielectric materials containing elastic materials, such as polymeric elastomers, have been developed in addition to the above-mentioned metallic materials.

[0047] However, conventional stretchable dielectrics can change their dielectric constant randomly when stretched.

[0048] As described above, such conventional stretchable dielectrics have irregular changes in dielectric constant, making them difficult to apply as substrates in stretchable systems.

[0049] This is because the high frequency elements of the stretchable system, such as antennas, capacitors, inductors, and circuits, must maintain their frequencies within certain ranges.

[0050] However, as described above, when conventional elastic dielectrics are stretched or contracted, the dielectric constant changes irregularly, and therefore the frequency of high frequency devices can change rather than being maintained within a predetermined range.

[0051] In response to this, the present invention provides a composite substrate whose dielectric constant changes substantially linearly when stretched.

[0052] Hereinafter, a composite substrate according to an embodiment of the present invention will be described with reference to the drawings.

[0053] FIG. 1 is a diagram illustrating a composite substrate according to an embodiment of the present invention.

[0054] As shown in FIG. 1, the composite substrate 100 includes an elastic polymer 1, an elastic polymer matrix 10, a dielectric powder 3, and a dielectric cluster 30.

[0055] Each component will be described below.

[0056] Stretchable polymer 1 According to an embodiment of the present invention, the elastic polymer 1 can form an elastic polymer matrix 10, which will be described later.

[0057] For this reason, the elastic polymer 1 is a material having elasticity.

[0058] According to one embodiment, the elastic polymer 1 is a silicon-based material. For example, the silicon-based material may include Ecoflex. However, the elastic polymer 1 is not limited to Ecoflex and may be any silicon-based material. For example, the silicon-based material may be PDMS or SEBS.

[0059] Therefore, according to the present invention, the elastic polymer matrix 10 described below contains the elastic polymer 1, that is, a silicon-based material, and therefore, it goes without saying that it has elasticity.

[0060] Elastic polymer matrix 10 According to an embodiment of the present invention, the stretchable polymer matrix 10 can provide the composite substrate 100 with stretchability.

[0061] For this purpose, the elastic polymer matrix 10 can be formed from the elastic polymer 1 .

[0062] This allows the stretchable polymer matrix 10 to have stretchability, as described above.

[0063] 1, the elastic polymer matrix 10 includes a dielectric powder 3, which will be described later, and dielectric clusters 30 formed from the dielectric powder 3, which will be described in more detail later.

[0064] Dielectric Powder 3 According to an embodiment of the present invention, the dielectric powder 3 can impart dielectric properties to the composite substrate 100 .

[0065] For this reason, the dielectric powder 3 is a material having dielectric properties.

[0066] According to one embodiment, the dielectric powder 3 is a metal oxide-based material. For example, the metal oxide-based material is at least one selected from metal oxide-based materials including barium titanate, strontium titanate, and aluminum oxide. However, the dielectric powder 3 is not limited to barium titanate, strontium titanate, and aluminum oxide, and may be any metal oxide-based material as described above.

[0067] Therefore, according to the present invention, the dielectric clusters 30 described below contain the dielectric powder 3, i.e., metal oxide-based material, and therefore, needless to say, can have dielectric properties.

[0068] Dielectric Cluster 30 According to an embodiment of the present invention, the dielectric clusters 30 can change the dielectric constant (ε, see the graph in FIG. 1) of the composite substrate 100 .

[0069] 1, the dielectric clusters 30 may be formed of the dielectric powder 3 and have a predetermined shape. Here, the predetermined shape may be any shape formed by adjacent particles of the dielectric powder 3. For example, the predetermined shape may include a circle, a polygon, or the like formed by adjacent particles of the dielectric powder 3.

[0070] As shown in FIG. 1, when the dielectric cluster 30 expands or contracts, the predetermined shape changes and the dielectric constant (ε) changes.

[0071] This is because, as described above, the dielectric clusters 30 are contained in the elastic polymer matrix 10 .

[0072] More specifically, when the stretching proceeds in the stretched direction as shown in FIG. 1, the predetermined shape of the dielectric clusters 30 can change such that the number of the dielectric powders 3 per unit volume of the stretchable polymer matrix 10 decreases.

[0073] As a result, the dielectric constant (ε) can decrease substantially linearly and rapidly as the stretching proceeds in the stretched direction, as shown in the graph of FIG.

[0074] That is, when the composite substrate 100 according to the embodiment of the present invention is stretched as shown in FIG. 1, the predetermined shape of the dielectric clusters 30 changes, and the dielectric constant (ε) can be changed.

[0075] More specifically, according to an experimental example of the present invention, the composite substrate 100 may have a variable dielectric constant (ε, see the y-axis DEEC in FIG. 26) range within a strain range of 0.1% to 30%. Here, the variable dielectric constant (ε) ranges from 1.5 to 7.5, as seen in FIG. 26 (see the y-axis DEEC in FIG. 26). Here, the dielectric constant (ε) may refer to a dielectric constant.

[0076] Meanwhile, as shown in FIG. 26, the dielectric constant ε (x-axis in FIG. 26) of the composite substrate 100 (DEEC) can rapidly decrease at a gradient of 0.03 to 0.08 in the range of strain (y-axis in FIG. 26) of 0.1% to 30%.

[0077] Therefore, according to the present invention, when the composite substrate 100 is applied to a high frequency device, it has excellent frequency characteristics.

[0078] More specifically, in the high-frequency elements of the stretchable system, such as antennas, capacitors, inductors, and circuits, the frequency must be maintained within a predetermined range, where the frequency is determined by the following equation 1:

[0079]

number

[0080] According to Equation 1, when the high frequency element expands or contracts, for example, when it expands or contracts in the expansion direction, the dielectric constant must decrease in order to maintain a constant frequency.

[0081] More specifically, according to Equation 1, when the high frequency element expands and contracts in the expansion direction, the dielectric constant must decrease by the square of the expansion length.

[0082] Therefore, in order for the high frequency element to maintain the frequency constant, a gradient is required in which the dielectric constant decreases sharply by a square of the stretched length.

[0083] Meanwhile, according to the present invention, as described above, the dielectric constant ε (see x-axis in Figure 26) of the composite substrate 100 (DEEC) can rapidly decrease at a gradient of 0.03 to 0.08 in the strain range of 0.1% to 30%.

[0084] Therefore, when the composite substrate 100 according to the present invention is applied to a high frequency device, it can maintain a constant frequency and has excellent frequency characteristics. Experimental examples of the present invention will be described in more detail below.

[0085] Meanwhile, according to the embodiment of the present invention, the composite substrate 100 has excellent thermal conductivity.

[0086] More specifically, according to the experimental examples of the present invention, as shown in Figures 46 and 47, the composite substrate 100 (DEEC) can have a thermal conductivity of 0.1 W / mk or more to 10 W / mk or less.

[0087] This is because the composite substrate 100 contains the dielectric powder 3, as described above.

[0088] Therefore, according to the present invention, when the composite substrate 100 is applied to the high frequency device, it is obvious that the composite substrate 100 has excellent heat conduction characteristics. Experimental examples of the present invention will be described in more detail later.

[0089] The composite substrate 100 according to the embodiment of the present invention has been described above.

[0090] A method for manufacturing a composite substrate 100 according to an embodiment of the present invention will now be described with reference to the drawings.

[0091] In the following description of the manufacturing method of the composite substrate 100, any description that overlaps with the description of the above embodiment will be omitted. However, the omission of the overlapping description below does not mean that the overlapping description will be excluded, and the overlapping description will refer to the description of the above embodiment.

[0092] 2 to 7 are diagrams illustrating a method for manufacturing a composite substrate according to an embodiment of the present invention.

[0093] As shown in FIG. 2, the method for manufacturing the composite substrate 100 includes the steps of: dispersing the stretchable polymer 1 having stretchability in a solvent to prepare a source solution (S110); mixing the dielectric powder 3 having dielectric properties into the source solution to prepare a dielectric source (S120); providing a catalyst that generates an attractive force between the dielectric powder 3 in the dielectric source to form the dielectric clusters 30 of a predetermined shape from the dielectric powder 3 (S130); and curing the dielectric source in which the dielectric clusters 30 are formed to manufacture the composite substrate 100 in which the dielectric clusters 30 are dispersed in the stretchable polymer matrix 10 formed from the stretchable polymer 1 (S140).

[0094] Each step will be explained below.

[0095] Step S110 As shown in FIG. 3, in step S110, the stretchable polymer 1 having stretchability is dispersed in a solvent 2 to prepare a source solution 7.

[0096] More specifically, in this step, the elastic polymer 1 is prepared by mixing the base agent and the curing agent in the same mass ratio, for example, 1:1.

[0097] Meanwhile, in this step, the produced elastic polymer 1 is dispersed in the solvent 2 .

[0098] According to one embodiment, in this step, the solvent 2 may be a polar liquid that is immiscible with water. For example, the polar liquid may include dichloromethane. However, the solvent 2 is not limited to dichloromethane, and may be any polar liquid that is immiscible with water.

[0099] Meanwhile, in this step, the elastic polymer 1 may be the above-mentioned silicon-based material. In this regard, the description of the above embodiment is to be referred to for the overlapping parts.

[0100] Step S120 As shown in FIG. 4, in step S120, the dielectric powder 3 having dielectric properties is mixed into the source solution 7 (see FIG. 3) to produce a dielectric source 8.

[0101] More specifically, in this step, the dielectric powder 3 has a nanoparticle size, for example, the dielectric powder 3 may have a size of 100 nm.

[0102] According to one embodiment, in this step, the dielectric powder 3 is a metal oxide-based material. In this regard, the description of the previous embodiment is to be referred to for the overlapping parts.

[0103] Step S130 As shown in Figures 5 and 6, in step S130, a catalyst 4 that generates an attractive force (af) between the dielectric powder 3 is provided to the dielectric source 8 to form the dielectric clusters 30 of a predetermined shape from the dielectric powder 3.

[0104] More specifically, in this step, the catalyst 4 may be provided to the dielectric source 8 by a drip method. Here, the drip method may be understood as a concept including providing the catalyst 4 to the dielectric source 8 by dropping it in droplets.

[0105] As a result, when the catalyst 4 is provided in the form of droplets to the dielectric source 8 as shown in Fig. 5, an attractive force (af) can be generated between the dielectric powder 3, and the dielectric clusters 30 having a predetermined shape are formed from the dielectric powder 3 as shown in Fig. 6. Here, the predetermined shape may be any shape in which the dielectric powder 3 is formed adjacent to each other. In this regard, the description of the above embodiment is to be referred to for parts that overlap with the description of the above embodiment.

[0106] Meanwhile, in this step, the catalyst 4 may be provided by the drip method while the dielectric source 8 is stirred at a predetermined speed for a predetermined time. For example, in this step, the catalyst 4 may be provided by the drip method while the dielectric source 8 is stirred at a speed of 900 rpm to 1100 rpm for 20 minutes.

[0107] As a result, according to the present invention, the dielectric clusters 30 having the predetermined shape can be easily formed.

[0108] According to one embodiment, in this step, the catalyst 4 may be water.

[0109] Step S140 As shown in FIG. 7, in step S140, the dielectric source 8 (see FIG. 6) on which the dielectric clusters 30 are formed is cured to manufacture the composite substrate 100.

[0110] As a result, in this step, the composite substrate 100 can have a structure in which the dielectric clusters 30 are dispersed in the elastic polymer matrix 10 formed from the elastic polymer 1, as shown in Figure 7.

[0111] Therefore, according to the present invention, when the composite substrate 100 is stretched (see FIG. 1) as described above, the predetermined shape of the dielectric clusters 30 changes, thereby varying the dielectric constant (ε).

[0112] More specifically, according to the experimental example of the present invention, as described in Figure 26, the dielectric constant ε (x-axis of Figure 26) of the composite substrate 100 (DEEC) can rapidly decrease at a gradient of 0.03 to 0.08 in the strain range (y-axis of Figure 26) of 0.1% to 30%.

[0113] Therefore, according to the present invention, when the composite substrate 100 is applied to a high frequency device, it has excellent frequency characteristics, which can be expressed by Equation 1 as described above.

[0114] According to Equation 1, as described above, in order for the frequency to be maintained constant in the high-frequency element, a gradient is required in which the dielectric constant decreases sharply by a square of the stretched length.

[0115] Meanwhile, according to the present invention, as described above, the dielectric constant ε (see x-axis in Figure 26) of the composite substrate 100 (DEEC) can rapidly decrease at a gradient of 0.03 to 0.08 in the strain range of 0.1% to 30%.

[0116] Therefore, according to the present invention, when the composite substrate 100 is applied to a high frequency device, it is possible to maintain a constant frequency and it is obvious that the frequency characteristics are excellent. In this regard, the description of the above embodiment is to be referred to for the overlapping parts.

[0117] Meanwhile, according to the embodiment of the present invention, the composite substrate 100 also has excellent thermal conductivity as described above, which will be explained in more detail in the experimental examples of the present invention.

[0118] The method for manufacturing the composite substrate 100 according to the embodiment of the present invention has been described above.

[0119] Experimental examples of the present invention will be described below.

[0120] <Manufacture of the first composite substrate 100 (DEEC, DEEC-BaTiO, M-BaTiO) according to an experimental example of the present invention> The base resin and the curing agent were mixed in a mass ratio of 1:1 to prepare Ecoflex as the elastic polymer 1.

[0121] As the solvent 2, 12 ml of dichloromethane was prepared, and 10 g of the Ecoflex was dispersed in the dichloromethane to prepare the source solution 7.

[0122] The dielectric source 8 was manufactured by mixing 6 g of 100 nm size barium titanate (BaTiO3) powder as the dielectric powder 3 into the source solution 7.

[0123] While the dielectric source 8 was stirred at a speed of 1000 rpm for 20 minutes, 1 mL of water as the catalyst 4 was added dropwise to the dielectric source 8 by a drip method to form the circular dielectric clusters 30 .

[0124] The dielectric source 8 on which the dielectric clusters 30 were formed was placed in a mold and cured to fabricate a first composite substrate 100 (DEEC, DEEC-BaTiO3, M-BaTiO3) according to the experimental example of the present invention.

[0125] <Preparation of second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention> In the first composite substrate manufacturing method according to the present invention, strontium titanate (SrTiO3) was mixed in place of barium titanate (BaTiO3), to manufacture a second composite substrate (DEEC-SrTiO3) according to the present invention.

[0126] <Production of the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention> In the first composite substrate manufacturing method according to the present invention, aluminum oxide (Al2O3) was mixed in place of barium titanate (BaTiO3), to manufacture a third composite substrate (DEEC-Al2O3) according to the present invention.

[0127] <Preparation of first elastic polymer (Ecoflex) according to a comparative example> In the first composite substrate manufacturing method according to the experimental example of the present invention, only Ecoflex was manufactured as an elastic polymer, and a first elastic polymer (Ecoflex) according to the comparative example was prepared.

[0128] <Preparation of a second elastic polymer (VHB) according to a comparative example> In the first composite substrate manufacturing method according to the experimental example of the present invention described above, Ecoflex and a polyacrylate-based polymer were prepared as the elastic polymer, and a second elastic polymer (VHB) was prepared according to the comparative example.

[0129] <Production of first substrate (BaTiO3-μP) according to comparative example> In the method for manufacturing the first composite substrate according to the experimental example of the present invention described above, water was not added, and micro-sized barium titanate (BaTiO3) powder was mixed as the dielectric powder to manufacture the first substrate (BaTiO3-μP) according to the comparative example.

[0130] <Production of second substrate (H-BaTiO3, BaTiO3-composite, BaTiO3) according to comparative examples> In the above-described method for manufacturing the first composite substrate according to the experimental example of the present invention, water was not added, and the second substrate (H-BaTiO3, BaTiO3-composite, BaTiO3) according to the comparative example was manufactured.

[0131] <Production of the third substrate (SrTiO3-composite) according to a comparative example> A third substrate (SrTiO3-composite) according to the comparative example was manufactured by mixing strontium titanate (SrTiO3) instead of barium titanate (BaTiO3) in the manufacturing method of the second substrate according to the comparative example described above.

[0132] <Production of Fourth Substrate (Al2O3-composite) by Comparative Example> In the second substrate manufacturing method according to the comparative example described above, aluminum oxide (Al2O3) was mixed in place of barium titanate (BaTiO3), to manufacture a fourth substrate (Al2O3-composite) according to the comparative example.

[0133] 8 to 54 are diagrams for explaining experimental examples of the present invention.

[0134] FIG. 8 is a photograph of a first composite substrate 100 according to an experimental example of the present invention.

[0135] As shown in FIG. 8, it is demonstrated that the first composite substrate 100 has stretchability.

[0136] (a) to (d) of FIG. 9 are photographs of the second substrate (BaTiO3-composite) according to a comparative example.

[0137] As shown in FIG. 9, since water was not provided as the catalyst 4 on the second substrate (BaTiO3-composite), the dielectric clusters 30 were not formed.

[0138] FIG. 10(a) is a photograph of the second substrate (BaTiO3-composite) according to the comparative example before stretching, and FIG. 10(b) is a photograph of the second substrate (BaTiO3-composite) according to the comparative example after stretching by 30%.

[0139] 10(a) and 10(b), it can be seen that the dielectric clusters 30 are not formed on the second substrate (BaTiO3-composite) because water is not provided as the catalyst 4.

[0140] Figure 11(a) is a photograph of the second substrate (BaTiO3-composite) according to the comparative example, Figure 11(b) is a photograph of the first substrate (BaTiO3-μP) according to the comparative example, and Figure 11(c) is a photograph of the first composite substrate 100 according to an experimental example of the present invention.

[0141] As shown in (a) of Figure 11, since water was not provided as the catalyst 4 on the second substrate (BaTiO3-composite), the dielectric clusters 30 were not formed and it could be observed that the dielectric powder 3 was dispersed.

[0142] As in the second substrate (BaTiO3-composite), when the dielectric clusters 30 are not formed and the dielectric powder 3 is dispersed, the dielectric constant of the substrate cannot be rapidly reduced.

[0143] As shown in FIG. 11(b), barium titanate (BaTiO3) particles (mp) of several tens of microns in size can be observed on the first substrate (BaTiO3-μP).

[0144] When barium titanate (BaTiO3) particles (mp) of several tens of microns in size are included, as in the first substrate (BaTiO3-μP), the stretchability of the substrate decreases.

[0145] As shown in FIG. 11(c), the circular dielectric clusters 30 can be observed on the first composite substrate 100.

[0146] Therefore, according to the experimental example of the present invention, it can be verified that the first composite substrate 100 includes the circular dielectric clusters 30 .

[0147] 12(a) to 12(d) are photographs of a first composite substrate 100 (M-BaTiO3) according to an experimental example of the present invention.

[0148] 12(a) to (d) also prove that the first composite substrate 100 (M-BaTiO 3 ) contains the dielectric clusters 30.

[0149] Also, as shown in FIG. 12, since the first composite substrate 100 includes the dielectric clusters 30, it can be observed that vacancies, i.e., spaces (vc, vacancies), are formed between the dielectric clusters 30 due to the attraction force (af) between the dielectric powder 3.

[0150] Figure 13(a) is a photograph of the first composite substrate 100 according to an experimental example of the present invention before stretching, and Figure 13(b) is a photograph of the first composite substrate 100 according to an experimental example of the present invention after stretching by 30%.

[0151] The dielectric clusters 30 dispersed in the first composite substrate 100 can also be observed in FIG. 13(a).

[0152] Furthermore, it can be observed from FIG. 13(b) that when the first composite substrate 100 is stretched, the shape of the dielectric clusters 30 changes.

[0153] Figure 14(a) is a photograph of the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention before stretching, Figure 14(b) is a photograph of the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention before stretching, and Figure 14(c) is a photograph of the first substrate (BaTiO3-μP) according to the comparative example before stretching.

[0154] Figure 15(a) is a photograph of the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention stretched by 30%, Figure 15(b) is a photograph of the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention stretched by 30%, and Figure 15(c) is a photograph of the first substrate (BaTiO3-μP) according to the comparative example stretched by 30%.

[0155] As shown in Figures 14 and 15, in the case of the second and third composite substrates (DEEC-SrTiO3, DEEC-Al2O3) manufactured according to the experimental examples of the present invention, it can be observed that the shape of the dielectric clusters 30 changes when stretched.

[0156] In contrast, in the case of the first substrate (BaTiO3-μP) manufactured according to the comparative example, it can be seen that there is no change in shape even when stretched.

[0157] This is because, as described above, when the first substrate (BaTiO3-μP) contains barium titanate (BaTiO3) particles (mp) of several tens of microns in size, the stretchability of the substrate decreases.

[0158] (a) of Figure 16 is a photograph of the first composite substrate 100 according to an experimental example of the present invention before stretching when the volume fraction of the dielectric powder 3 is 1% (1 vol%), (b) of Figure 16 is a photograph of the first composite substrate 100 according to an experimental example of the present invention before stretching when the volume fraction of the dielectric powder 3 is 10% (10 vol%), (c) of Figure 16 is a photograph of the first composite substrate 100 according to an experimental example of the present invention after stretching by 30% when the volume fraction of the dielectric powder 3 is 1% (1 vol%), and (d) of Figure 16 is a photograph of the first composite substrate 100 according to an experimental example of the present invention after stretching by 30% when the volume fraction of the dielectric powder 3 is 10% (10 vol%).

[0159] As shown in FIG. 16, it can be observed that the shape of the dielectric clusters 30 changes in all of the experimental examples of the present invention.

[0160] FIG. 17 is a 100 μm scale photograph of the first composite substrate 100 according to an experimental example of the present invention before stretching and after stretching by 30%, and FIG. 18 is a 10 μm scale photograph of the first composite substrate 100 according to an experimental example of the present invention before stretching and after stretching by 30%.

[0161] As shown in FIGS. 17 and 18, it can be observed that the shape of the dielectric clusters 30 in the first composite substrate 100 has changed.

[0162] More specifically, it can be observed that the dielectric clusters 30 in the first composite substrate 100, which were circular before the stretching, changed to elliptical shapes after the 30% stretching.

[0163] This proves that when the first composite substrate 100 is stretched, the shape of the dielectric clusters 30 changes so that the number of the dielectric powders 3 per unit volume of the stretchable polymer matrix 10 decreases.

[0164] Figure 19(a) shows the results of a stretchability simulation when the first substrate (BaTiO3-μP) according to the comparative example is stretched by 30%, and Figure 19(b) shows the results of a stretchability simulation when the first composite substrate (DEEC) according to the experimental example of the present invention is stretched by 30%.

[0165] As shown in FIG. 19, it is demonstrated that the first composite substrate (DEEC) has better stretchability than the first substrate (BaTiO3-μP).

[0166] (a) of Figure 20 shows the simulation results of the first composite substrate 100 according to an experimental example of the present invention before stretching, (b) of Figure 20 shows the simulation results of the first composite substrate 100 according to an experimental example of the present invention stretched by 30% when the volume fraction of the dielectric powder 3 is 13% (13 vol%), and (c) of Figure 20 shows the simulation results of the first substrate (BaTiO3-μP) according to the comparative example stretched by 30% when the volume fraction of the dielectric powder is 13% (13 vol%).

[0167] Figure 21(a) shows the simulation results of a first composite substrate 100 according to an experimental example of the present invention stretched by 30% when the volume fraction of the dielectric powder 3 is 1% to 13% (1 to 13 vol%), and Figure 21(b) shows the simulation results of a first substrate (BaTiO3-μP) according to a comparative example stretched by 30% when the volume fraction of the dielectric powder 3 is 1% to 13% (1 to 13 vol%).

[0168] 20(a) to 21(b) also prove that the first composite substrate (DEEC) has better stretchability than the first substrate (BaTiO3-μP).

[0169] Figure 22(a) shows the results of a stretchability simulation when the first substrate (BaTiO3-μP) according to the comparative example is stretched by 30%, and Figure 22(b) shows the results of a stretchability simulation when the first composite substrate 100 according to the experimental example of the present invention is stretched by 30%.

[0170] Figures 22(a) and (b) also demonstrate that the first composite substrate (DEEC) has better stretchability than the first substrate (BaTiO3-μP).

[0171] (a) and (c) of Figure 23 are capacitance simulation results of the first composite substrate 100 according to an experimental example of the present invention before stretching, (b) and (d) of Figure 23 are capacitance simulation results of the first composite substrate 100 according to an experimental example of the present invention when stretched by 30%, and (e) of Figure 23 is a capacitance simulation legend.

[0172] As shown in FIG. 23, the first composite substrate 100 has a uniform capacitance distribution even when stretched by 30%.

[0173] FIG. 24 shows a simulation curve of permittivity change obtained when a substrate having elasticity and dielectricity is stretched.

[0174] As shown in FIG. 24, for a substrate having elasticity and dielectricity, if the theoretical limit is eliminated, the dielectric constant of the simulation results can be reduced at a gradient of 0.043 to 0.044 in the elastic range of 0.1% to 80%.

[0175] Referring to Figure 26, this is a more gradual result than the decrease in the dielectric constant of the first composite substrate (DEEC) in the experimental example of the present invention described later, which decreases at a gradient of 0.03 to 0.08 in the expansion and contraction range of 0.1% to 30%.

[0176] Therefore, according to the experimental examples of the present invention, it can be verified that the first composite substrate (DEEC) has a dielectric constant that decreases more rapidly than the simulation results when it expands and contracts.

[0177] FIG. 25 shows the measurement results of capacitance change depending on the elongation rate of the first composite substrate (DEEC) according to an experimental example of the present invention and the first elastic polymer (Ecoflex) according to a comparative example.

[0178] As shown in FIG. 25, the first composite substrate (DEEC) demonstrates a smaller capacitance change than the first stretchable polymer (Ecoflex) when stretched 30%.

[0179] Figure 26 shows the results of measuring the dielectric constant (ε) of the first composite substrate (DEEC) according to an experimental example of the present invention, the first substrate (BaTiO3-μP) according to the comparative example, the second substrate (H-BaTiO3) according to the comparative example, and the first elastic polymer (Ecoflex) according to the comparative example in a strain range of 0.1% or more to 30% or less.

[0180] As shown in Figure 26, the first composite substrate (DEEC) has a variable dielectric constant range as described above, with an expansion / contraction range of 0.1% to 30%. More specifically, the first composite substrate (DEEC) has a variable dielectric constant range of 1.5 to 7.5 as shown in Figure 26.

[0181] Also, as shown in FIG. 26, it can be seen that the dielectric constant of the first composite substrate (DEEC) decreases rapidly at a gradient of 0.03 to 0.08 in the expansion / contraction range of 0.1% to 30%.

[0182] Therefore, according to the present invention, the first composite substrate 100 (DEEC) has excellent frequency characteristics when applied to a high frequency device as described above.

[0183] This is because, according to the experimental example of the present invention, when the first composite substrate 100 (DEEC) expands and contracts as described above, the shape of the dielectric clusters 30 changes, thereby varying the dielectric constant.

[0184] On the other hand, compared to the experimental example of the present invention, it can be seen that the gradients of the second substrate (H-BaTiO3), the first substrate (BaTiO3-μP), and the first elastic polymer (Ecoflex) are gentler than those of the experimental example of the present invention.

[0185] Among them, the second substrate (H-BaTiO3) has the steepest decreasing gradient. Looking at this, it can be seen that the second substrate (H-BaTiO3) decreases at a gradient of 0.025 in the expansion / contraction range of 0.1% to 30%.

[0186] Therefore, considering the simulation results described in Figure 24 above, which show that the dielectric constant decreases at a gradient of 0.043 to 0.044 in the expansion / contraction range of 0.1% to 80%, it can be proven that the gradient decreases most rapidly in the experimental example of the present invention.

[0187] FIG. 27 shows the results of measuring the dielectric constant (ε) of the second substrate (BaTiO3-composite) according to the comparative example, the third substrate (SrTiO3-composite) according to the comparative example, the fourth substrate (Al2O3-composite) according to the comparative example, the first elastic polymer (Ecoflex) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example in a strain range of 0.1% or more and 30% or less.

[0188] As shown in Figure 27, when the dielectric powder 3 contains barium titanate (BaTiO3) and strontium titanate (SrTiO3) in the expansion / contraction range of 0.1% to 30%, the dielectric constant decreases at a steeper gradient than in other comparative examples.

[0189] Therefore, when the dielectric powder 3 contains barium titanate (BaTiO3) and / or strontium titanate (SrTiO3), it can be proven that the dielectric constant characteristics against expansion and contraction are excellent.

[0190] Figure 28 shows the results of measuring the dielectric constant (ε) of the first composite substrate (DEEC-BaTiO3) according to an experimental example of the present invention, the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention, the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention, the first elastic polymer (Ecoflex) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example in a strain range of 0.1% or more to 30% or less.

[0191] As shown in FIG. 28, the first and second composite substrates (DEEC-BaTiO3, DEEC-SrTiO3) show a rapid decrease in the gradient of 0.03 to 0.08 in the expansion / contraction range of 0.1% to 30%.

[0192] Therefore, according to the present invention, it goes without saying that the first and second composite substrates (DEEC-BaTiO3, DEEC-SrTiO3) have excellent frequency characteristics when applied to high frequency devices as described above.

[0193] Figures 29 and 30 show the results of stretching the first composite substrate 100 according to an experimental example of the present invention in a range of expansion and contraction of 0.1% to 30% when the volume fraction of the dielectric powder 3 is 1% to 13% (1 to 13 vol%).

[0194] As shown in FIGS. 29 and 30, in the first composite substrate 100, as the volume fraction of the dielectric powder 3 increases, the dielectric constant decreases sharply.

[0195] Meanwhile, when the volume fraction of the dielectric powder 3 in the first composite substrate 100 is greater than 7% and less than or equal to 13%, the gradient is maintained at 0.058 to 0.059.

[0196] Therefore, according to the experimental examples of the present invention, considering the relationship between the stretch length, dielectric constant, and frequency as described above, it is proven that the first composite substrate 100 containing the dielectric powder 3 at a volume fraction of more than 7% to 13% improves the frequency characteristics of high-frequency elements.

[0197] FIG. 31 shows the results of measuring the change in dielectric constant of the first composite substrate (DEEC-BaTiO3) according to an experimental example of the present invention, the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention, and the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention.

[0198] As shown in Figure 31, experiments of the present invention have shown that when barium titanate (BaTiO3) and strontium titanate (SrTiO3) are used as the dielectric powder 3, the dielectric constant change characteristics are superior to when aluminum oxide (Al2O3) is used.

[0199] FIG. 32 shows the results of measuring the relationship between the strain at break and the initial dielectric constant depending on the volume fraction of the dielectric powder 3 in the first composite substrate 100 according to an experimental example of the present invention.

[0200] As shown in FIG. 32, in the first composite substrate 100, as the volume fraction of the dielectric powder 3 increases, the strain at break decreases, while the initial dielectric constant increases.

[0201] Figure 33 shows the results of measuring the dielectric loss (Loss Tangent) of the first composite substrate (DEEC) according to an experimental example of the present invention, the first substrate (BaTiO3-μP) according to the comparative example, the second substrate (H-BaTiO3) according to the comparative example, and the first elastic polymer (Ecoflex) according to the comparative example in a strain range of 0.1% or more to 30% or less.

[0202] As shown in Figure 33, the dielectric loss of the first composite substrate (DEEC) is lower than that of other comparative examples, and it can be seen that the dielectric loss remains constant even when stretched in the stretch range of 0.1% to 30%.

[0203] This proves the excellent dielectric constant characteristics of the composite substrate 100 manufactured in the experimental example of the present invention.

[0204] Figure 34 shows the results of measuring the dielectric loss (Loss Tangent) of the first composite substrate (DEEC-BaTiO3) according to an experimental example of the present invention, the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention, the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention, the first elastic polymer (Ecoflex) according to a comparative example, and the second elastic polymer (VHB) according to a comparative example, in a strain range of 0.1% to 30%.

[0205] As shown in Figure 34, the dielectric losses of the first to third composite substrates (DEEC-BaTiO3, DEEC-SrTiO3, DEEC-Al2O3) are similar but less than those of the other comparative examples, and it can be seen that the dielectric loss remains constant even when stretched in the stretching range of 0.1% to 30%.

[0206] This proves the excellent dielectric constant characteristics of the composite substrate 100 manufactured in the experimental example of the present invention.

[0207] Figure 35 shows the results of measuring the dielectric loss (Loss Tangent) in the frequency range of 2.0 or more to 3.0 or less for the second substrate (BaTiO3-composite) according to the comparative example, the third substrate (SrTiO3-composite) according to the comparative example, the fourth substrate (Al2O3-composite) according to the comparative example, the first elastic polymer (Ecoflex) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example.

[0208] As shown in Figure 35, among the comparative examples, when the dielectric powder 3 contains barium titanate (BaTiO3), strontium titanate (SrTiO3), and aluminum oxide (Al2O3), the dielectric loss is small and remains relatively constant in the frequency range of 2.0 or more to 3.0 or less.

[0209] On the other hand, among the comparative examples, when the dielectric powder 3 is not contained, i.e., when the material is made of only an elastic polymer material (Ecoflex, VHB), the dielectric loss is large in the frequency range of 2.0 or more to 3.0 or less, and it is found that the loss increases and decreases irregularly.

[0210] Figure 36 shows the results of measuring the dielectric loss (Loss Tangent) in the frequency range of 2.0 to 3.0 for the first composite substrate (DEEC-BaTiO3) according to an experimental example of the present invention, the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention, the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention, the first elastic polymer (Ecoflex) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example.

[0211] As shown in Figure 36, according to the experimental example of the present invention, when the dielectric powder 3 contains barium titanate (BaTiO3), strontium titanate (SrTiO3), and aluminum oxide (Al2O3), the dielectric loss is lower and maintained constant in the frequency range of 2.0 to 3.0 compared to the comparative examples mentioned above, i.e., the second substrate (BaTiO3-composite) according to the comparative example, the third substrate (SrTiO3-composite) according to the comparative example, and the fourth substrate (Al2O3-composite) according to the comparative example.

[0212] Therefore, it is proved from the experimental examples of the present invention that when water is used as the catalyst 4, the dielectric clusters 30 are formed, and therefore the manufactured composite substrate 100 has excellent dielectric constant characteristics.

[0213] In contrast, as mentioned above, in the comparative examples that do not contain the dielectric powder 3, i.e., that consist only of an elastic polymer material (Ecoflex, VHB), the dielectric loss is high in the frequency range of 2.0 or more to 3.0 or less, and it is found that it increases and decreases irregularly.

[0214] Figure 37 shows the results of measuring the dielectric constant in the frequency range of 2.0 to 3.0 for the second substrate (BaTiO3-composite) according to the comparative example, the third substrate (SrTiO3-composite) according to the comparative example, the fourth substrate (Al2O3-composite) according to the comparative example, the first elastic polymer (Ecoflex) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example.

[0215] As shown in Figure 37, when the dielectric powder 3 of the comparative examples contains barium titanate (BaTiO3), strontium titanate (SrTiO3), and aluminum oxide (Al2O3), the dielectric constant is higher than that of other comparative examples (Ecoflex, VHB) in the frequency range of 2.0 to 3.0 and is maintained relatively constant.

[0216] Figure 38 shows the results of measuring the dielectric constant in the frequency range of 2.0 to 3.0 for the first composite substrate (DEEC-BaTiO3) according to an experimental example of the present invention, the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention, the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention, the first elastic polymer (Ecoflex) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example.

[0217] As shown in Figure 38, according to the experimental example of the present invention, when the dielectric powder 3 contains barium titanate (BaTiO3) and strontium titanate (SrTiO3), the dielectric constant is higher than that of the comparative examples, i.e., the second substrate (BaTiO3-composite) according to the comparative example and the third substrate (SrTiO3-composite) according to the comparative example, in the frequency range of 2.0 or more to 3.0 or less.

[0218] Therefore, it is proved that when water is used as the catalyst 4 according to the experimental example of the present invention, the dielectric clusters 30 are formed, and therefore the composite substrate 100 manufactured has excellent dielectric constant characteristics.

[0219] Figure 39 shows the results of measuring the strain rate due to the applied stress when the volume fraction of the dielectric powder 3 is 10% (10 vol%) in the first composite substrate (DEEC) according to an experimental example of the present invention, the first substrate (BaTiO3-μP) according to the comparative example, and the second substrate (BaTiO3-composite) according to the comparative example.

[0220] As shown in Figure 39, the maximum strain rate due to stress of the first composite substrate (DEEC) and the second substrate (BaTiO3-composite) is similar, while the maximum strain rate due to stress of the first substrate (BaTiO3-μP) is half that of the first composite substrate (DEEC) and the second substrate (BaTiO3-composite).

[0221] According to the experimental examples of the present invention, when the dielectric clusters 30 are included, not only is the dielectric constant excellent as described above, but the strain rate due to applied stress is also at a similar level to that of the substrate containing the nanoparticle-sized dielectric powder 3 (the second substrate, BaTiO3-composite).

[0222] In contrast to this, it is understood that the first substrate (BaTiO3-μP) containing the dielectric powder 3 in micro-size has a weak strain rate due to applied stress.

[0223] Therefore, according to the experimental examples of the present invention, the excellent stretchability of the first composite substrate 100 (DEEC) is demonstrated.

[0224] Figure 40 shows the results of measuring the strain rate (Strain) due to the applied stress (Stress) of the first composite substrate (DEEC-BaTiO3) according to an experimental example of the present invention, the second composite substrate (DEEC-SrTiO3) according to an experimental example of the present invention, the third composite substrate (DEEC-Al2O3) according to an experimental example of the present invention, the first substrate (BaTiO3-μP) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example.

[0225] As shown in Figure 40, the maximum strain rates due to stress of the first to third composite substrates (DEEC-BaTiO3, DEEC-SrTiO3, DEEC-Al2O3) are similar, but are superior to the maximum strain rate due to stress of the first substrate (BaTiO3-μP).

[0226] Therefore, according to the experimental examples of the present invention, when the dielectric powder 3 includes barium titanate (BaTiO3), strontium titanate (SrTiO3), and aluminum oxide (Al2O3), the dielectric clusters 30 produced from the dielectric powder 3 not only have an excellent dielectric constant as described above, but also have an excellent strain rate due to applied stress.

[0227] The experimental examples of the present invention demonstrate the excellent flexibility of the composite substrate 100.

[0228] Figure 41 shows the results of measuring the strain rate due to applied stress when the volume fraction of the dielectric powder 3 in the first composite substrate 100 according to an experimental example of the present invention is 1% to 13% (1 to 13 vol%).

[0229] As shown in FIG. 41, when the volume ratio of the dielectric powder 3 in the first composite substrate 100 increases, the maximum strain rate due to stress decreases.

[0230] This is because, as the volume ratio of the dielectric powder 3 in the first composite substrate 100 increases, the volume ratio of the elastic polymer 1 in the first composite substrate 100 relatively decreases.

[0231] However, according to the experimental examples of the present invention, even when the volume fraction of the dielectric powder 3 in the first composite substrate 100 increases to 1% to 13% (1 to 13 vol%), it is found that the maximum strain rate due to stress is superior to that of the first substrate (BaTiO3-μP) described above.

[0232] The experimental examples of the present invention demonstrate the excellent flexibility of the composite substrate 100.

[0233] Figure 42 shows the results of measuring the frequency shift rate (Δf / f0) in the strain range of 0.1% to 30% for the first composite substrate (M-BaTiO3) according to an experimental example of the present invention, the second substrate (BaTiO3) according to a comparative example, and the first elastic polymer (Ecoflex) according to a comparative example.

[0234] As shown in FIG. 42, it can be seen that the composite substrate according to the experimental example of the present invention (the first composite substrate, M-BaTiO3) has the lowest frequency shift rate in the expansion / contraction range of 0.1% to 30%.

[0235] 43 and 44 show simulation results of applying a stress of 19.45 kPa to a first composite substrate 100 according to an experimental example of the present invention when the volume fraction occupied by the dielectric powder 3 is 1% or more and 13% or less (1 to 13 vol%).

[0236] As shown in FIGS. 43 and 44, when the volume ratio of the dielectric powder 3 in the first composite substrate 100 increases, the stress per unit volume increases.

[0237] Figure 45 shows the measurement results of the thermal conductivity of the first composite substrate (DEEC) according to an experimental example of the present invention, the first substrate (BaTiO3-μP) according to the comparative example, the first elastic polymer (Ecoflex) according to the comparative example, and the second elastic polymer (VHB) according to the comparative example.

[0238] As shown in FIG. 45, the first composite substrate (DEEC) can have a thermal conductivity of 0.1 W / mk or more and 10 W / mk or less.

[0239] This is because, according to the experimental example of the present invention, the composite substrate 100 contains the dielectric powder 3 as described above.

[0240] Therefore, according to the present invention, the composite substrate 100 has excellent heat conduction properties when applied to a high frequency device as described above.

[0241] Figure 46 shows the results of measuring the dielectric constant change (△ε), dielectric loss (Loss Tangent), stretchability, thermal conductivity (k), and Young's modulus of the first composite substrate (DEEC) according to an experimental example of the present invention, the first substrate (BaTiO3-μP) according to the comparative example, the second substrate (H-BaTiO3) according to the comparative example, and the first stretchable polymer (Ecoflex) according to the comparative example.

[0242] As shown in FIG. 46, the first composite substrate (DEEC) has excellent balance of the properties of dielectric constant change, dielectric loss, elasticity, thermal conductivity, and Young's modulus.

[0243] Thus, the experimental examples of the present invention prove that the first composite substrate 100 (DEEC) can be applied to high frequency devices of a stretchable system.

[0244] In the experimental examples of the present invention described later, the materials manufactured in the experimental examples of the present invention and the comparative examples described above were applied to the antenna (at) in FIG. 47, and the frequency characteristics were observed.

[0245] Figure 47(a) is a conceptual diagram of an experiment for applying the first composite substrate 100 according to an experimental example of the present invention to an antenna (at), Figure 47(b) is a photograph of an experimental set in which the first composite substrate 100 according to an experimental example of the present invention is applied to an antenna (at), and Figure 47(c) is a conceptual diagram of the frequency characteristics when a normal dielectric expands and contracts.

[0246] As shown in (a) of Figure 47, in order to apply the first composite substrate 100 to an antenna (at), a ground panel (gd) can be formed on the bottom surface of the first composite substrate 100, and a patch (pc) can be formed on the top surface of the first composite substrate 100.

[0247] Meanwhile, as shown in Figure 47(b), the antenna (at) manufactured according to the experimental concept diagram of Figure 47(a) can be observed. As described above, it can be seen that the manufactured antenna (at) has excellent stretching properties because the first composite substrate 100 has elasticity.

[0248] 47(a) and 47(b) were applied not only to the embodiment of the present invention but also to the comparative example described above. In other words, in the experiments shown in FIGS. 47(a) and 47(b), the experimental example of the present invention and the comparative example described above were applied as substrates, respectively.

[0249] On the other hand, as shown in FIG. 47(c), as described above, in the case of an antenna that includes a normal dielectric as a substrate, the dielectric constant can change when it expands or contracts.

[0250] However, according to the present invention, when the first composite substrate 100 is applied to a high frequency device, it can maintain a constant frequency.

[0251] The frequency characteristics based on experimental examples will be explained below.

[0252] Figure 48 shows the results of a simulation of the frequency characteristics when stretching using the first composite substrate (M-BaTiO3) according to an experimental example of the present invention, the second substrate (BaTiO3) according to a comparative example, and the first stretchable polymer (Ecoflex) according to a comparative example.

[0253] As shown in FIG. 48, the simulation results predicted that the first composite substrate (M-BaTiO3) would have the smallest frequency shift when stretched.

[0254] Figure 49 shows the results of simulating the frequency characteristics when the first composite substrate (M-BaTiO3) according to an experimental example of the present invention expands and contracts within a range of 0.1% to 30%, Figure 50 shows the results of simulating the frequency characteristics when the second substrate (BaTiO3) according to a comparative example expands and contracts within a range of 0.1% to 30%, and Figure 51 shows the results of simulating the frequency characteristics when the first elastic polymer (Ecoflex) according to a comparative example expands and contracts within a range of 0.1% to 30%.

[0255] Figure 52 shows the results of measuring the frequency characteristics by adjusting (detuning) the resonant frequency when the first composite substrate (M-BaTiO3) according to an experimental example of the present invention expands and contracts in the expansion range of 0.1% to 30% or less, Figure 53 shows the results of measuring the frequency characteristics by adjusting (detuning) the resonant frequency when the second substrate (BaTiO3) according to a comparative example expands and contracts in the expansion range of 0.1% to 30% or less, and Figure 54 shows the results of measuring the frequency characteristics by adjusting (detuning) the resonant frequency when the first elastic polymer (Ecoflex) according to a comparative example expands and contracts in the expansion range of 0.1% to 30% or less.

[0256] As shown in Figures 49 to 54, unlike other comparative examples, the frequency of the first composite substrate (M-BaTiO3) does not change even when it expands or contracts within the expansion range of 0.1% to 30%, and is maintained at a constant 2.5 GHz (see Figure 52).

[0257] Therefore, according to the experimental examples of the present invention, it can be proven that the composite substrate 100 (M-BaTiO3) can maintain a constant frequency when applied to a high frequency device, and has excellent frequency characteristics.

[0258] This is because, as mentioned above, the composite substrate 100 (M-BaTiO3) may contain the dielectric clusters 30, and when it expands and contracts in the expansion direction, the shape of the dielectric clusters 30 changes and the dielectric constant decreases linearly and rapidly.

[0259] Although the present invention has been described in detail using preferred embodiments, the scope of the present invention should not be limited to the specific embodiments, but should be analyzed by the appended claims. Furthermore, those skilled in the art will understand that many modifications and variations are possible within the scope of the present invention.

Claims

1. an elastic polymer matrix formed of an elastic polymer having elasticity; a dielectric cluster of a predetermined shape formed from a dielectric powder having dielectric properties and contained in the polymer matrix; A composite substrate characterized in that, when it expands or contracts, the predetermined shape of the dielectric clusters changes, thereby varying the dielectric constant.

2. When the stretching proceeds in the direction of extension, the predetermined shape of the dielectric clusters is changed to decrease the number of the dielectric powders per unit volume of the stretchable polymer matrix; The composite substrate of claim 1 , wherein the dielectric constant decreases linearly.

3. The variable dielectric constant range is within a stretch range of 0.1% to 30%, 2. The composite substrate according to claim 1, wherein the variable dielectric constant ranges from 1.5 to 7.

5.

4. 4. The composite substrate according to claim 3, wherein the dielectric constant decreases at a gradient of 0.03 to 0.08 in the range of expansion and contraction of 0.1% to 30%.

5. 2. The composite substrate according to claim 1, having a thermal conductivity of 0.1 W / mK or more and 10 W / mK or less.

6. the elastic polymer is a silicon-based material, 2. The composite substrate of claim 1, wherein the silicon-based material includes at least one selected from the group consisting of ecoflex, PDMS (polydimethylsiloxane), and SEBS (Styrene-Ethylene-Butylene-Styrene)-containing materials.

7. The dielectric powder is a metal oxide-based material, 2. The composite substrate according to claim 1, wherein the composite substrate is at least one selected from the group consisting of metal oxide-based materials including barium titanate, strontium titanate, and aluminum oxide.

8. Dispersing a stretchable polymer in a solvent to prepare a source solution; mixing a dielectric powder having dielectric properties into the source solution to prepare a dielectric source; providing a catalyst to the dielectric source to generate an attractive force between the dielectric powders to form dielectric clusters of a predetermined shape from the dielectric powders; and curing the dielectric source in which the dielectric clusters are formed to produce a composite substrate in which the dielectric clusters are dispersed in an elastic polymer matrix formed from the elastic polymer.

9. In the step of forming dielectric clusters, the catalyst is provided to the dielectric source by a dropwise method; The method for manufacturing a composite substrate according to claim 8, wherein the catalyst is water.

10. In the step of preparing the source solution, the solvent is a polar liquid that is immiscible with water, the polar liquid includes dichloromethane; the elastic polymer is a silicon-based material, 10. The method of claim 8, wherein the silicon-based material includes at least one selected from the group consisting of ecoflex, PDMS, and SEBS.

11. an elastic polymer matrix formed of an elastic polymer having elasticity; a dielectric cluster of a predetermined shape formed from a dielectric powder having dielectric properties and contained in the polymer matrix; When stretched, the predetermined shape of the dielectric cluster changes, and the dielectric constant varies, and the variable dielectric constant range is in the stretching range of 0.1% or more to 30% or less; the variable dielectric constant range is 1.5 or more and 7.5 or less, The composite substrate is characterized in that the dielectric constant decreases at a gradient of 0.03 to 0.08 in the range of expansion and contraction of 0.1% to 30%.

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