Patent Description:
Generally speaking, the electromagnetic wave radiation has lower energy, so it can not cause the dissociation of substances, nor can it directly damage environmental substances. However, in the current modern life relying on various electronic equipment, supplies, and devices, electromagnetic interference is an unignorable issue, which may interfere the normal operation of electronic devices and may also expose people to the harmful situation at any time. For example, after using a mobile phone or computer for a long time, people may feel physical fatigue, eye fatigue, shoulder pain, headache, sleepy, and restlessness, all of which may be caused by electromagnetic waves. Moreover, electromagnetic waves can also reduce human immune function and reduce calcium in the human body, and may cause some symptoms or diseases, such as miscarriage, visual disturbance, and interference to cell division (e.g. cancer, leukemia, brain tumors, etc.).

Document <CIT> discloses a radio wave absorbing coating, comprising at least one dielectric layer and at least one layer of electroconductive material, deposited onto said dielectric layer and with thickness less than characteristic skin-depth for selected material over the certain predefined radiofrequency band. Said coating is suitable for application over the broad radiofrequency band.

Document <NPL> describes a novel arrangement of polymer nanocomposites, which is able to very effectively absorb microwave radiation over a broad frequency range or selectively reflect desired wavelengths. The structure is built from alternating films of dielectric polymer and conducting layers. The latter are stacked in a precise gradient of conductivity. The conducting layers consist of either polycarbonate nanocomposite films with carbon nanotubes (CNT) or a very thin CNT coating deposited on insulating polymer from a CNT waterborne ink.

Document <CIT> discloses an electromagnetic wave absorber, which includes a dielectric layer, a resistive layer, and an electrically conductive layer. The resistive layer is disposed on one principal surface of the dielectric layer. The electrically conductive layer is disposed on the other principal surface of the dielectric layer and has a sheet resistance lower than a sheet resistance of the resistive layer. The resistive layer is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including <NUM> weight % or more of tin oxide.

An objective of this disclosure is to provide an electromagnetic absorption structure and an electronic device having the same. The electromagnetic wave absorption structure and electronic device can provide good electromagnetic wave absorption function, and have the features of light and thin, so they are particularly suitable for satisfying the electromagnetic wave absorption or shielding requirements of thin electronic products.

In one embodiment, the thickness of the electromagnetic wave absorption structure is between <NUM> and <NUM>.

In one embodiment, the thickness of the conductive composite layer is between <NUM> and <NUM>.

In one embodiment, the thickness of the insulating layer is between <NUM> and <NUM>.

The conductive composite layer comprises a plurality of conductive layers and a plurality of interlayer insulating layers, and the conductive layers and the interlayer insulating layers are stacked in a staggered manner.

In one embodiment, amounts of the conductive layers and the interlayer insulating layers in the conductive composite layer are different.

In one embodiment, the conductive layer is a graphene layer, a graphite layer, a graphite nanoplatelet layer, a carbon fiber layer, or a carbon nanotube layer.

In one embodiment, the thickness of the conductive layer is between <NUM> and <NUM>.

In one embodiment, the thickness of the interlayer insulating layer is between <NUM> and <NUM>.

The insulating layer or the interlayer insulating layer is a polymer resin layer, a resin/ceramic mixture layer or a resin/metal mixture layer.

In one embodiment, the sheet resistance of the conductive layer is between <NUM> ohm per square and <NUM> ohm per square.

To achieve the above, this disclosure also provide an electronic device comprising the above-mentioned electromagnetic wave absorption structure.

As mentioned above, the electromagnetic wave absorption structure of this disclosure comprises at least one electromagnetic wave composite absorbing layer, and the electromagnetic wave composite absorbing layer comprises a conductive composite layer and an insulating layer, which is stacked and overlapped with the conductive composite layer. In some embodiments, the electromagnetic wave absorption structure of this disclosure comprises at least two electromagnetic wave composite absorbing layer, and each electromagnetic wave composite absorbing layer comprises a conductive composite layer and an insulating layer, which is stacked and overlapped with the conductive composite layer. According to the configuration and structural design of this disclosure, the electromagnetic wave absorption structure and electronic device having the same can provide good electromagnetic wave absorption function, and have the features of light and thin, so they are particularly suitable for satisfying the electromagnetic wave absorption or shielding requirements of thin electronic products.

The disclosure will become more fully understood from the detailed description and accompanying drawings, which are given for illustration only, and thus are not limitative of the present disclosure, and wherein:.

The present disclosure will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.

<FIG> is a schematic diagram showing an electromagnetic wave absorption structure according to an embodiment of this disclosure, <FIG> is an enlarged view of the electromagnetic wave composite absorbing layer of the electromagnetic wave absorption structure as shown in <FIG>, and <FIG> are schematic diagrams showing electromagnetic wave absorption structures according to different embodiments of this disclosure.

Referring to <FIG>, the electromagnetic absorption structure <NUM> comprises at least one electromagnetic wave composite absorbing layer <NUM>. For example, the electromagnetic absorption structure <NUM> of this embodiment comprises one electromagnetic wave composite absorbing layer <NUM>. In other embodiments, the amount of the electromagnetic wave composite absorbing layer <NUM> can be greater than one, such as two, three, four, or more, and the multiple electromagnetic wave composite absorbing layers <NUM> are stacked and overlapped with each other. This disclosure does not particularly limit the number of the stacked electromagnetic wave composite absorbing layers <NUM>, and the number of the stacked electromagnetic wave composite absorbing layers <NUM> can be determined based on the required electromagnetic wave absorption effect and thickness. In general, the more electromagnetic wave composite absorbing layers <NUM> are configured, the better absorption effect can be provided. In some embodiments, the thickness of the electromagnetic wave absorption structure <NUM> is between <NUM> and <NUM> (including <NUM> and <NUM>). Accordingly, the electromagnetic wave absorption structure <NUM> has the features of light and thin, and it is particularly suitable for satisfying the electromagnetic wave absorption or shielding requirements of thin electronic products.

The electromagnetic wave composite absorbing layer <NUM> comprises a conductive composite layer <NUM> and an insulating layer <NUM>, which is stacked and overlapped with the conductive composite layer <NUM>. In some embodiments, the thickness of the conductive composite layer <NUM> is between <NUM> and <NUM> (including <NUM> and <NUM>), and the thickness of the insulating layer <NUM> is between <NUM> and <NUM> (<NUM> ≤ the thickness of the insulating layer <NUM> ≤ <NUM>). For example, the thickness of the insulating layer <NUM> is <NUM> or <NUM>.

As shown in <FIG>, the conductive composite layer <NUM> of this embodiment comprises a plurality of conductive layers <NUM> and a plurality of interlayer insulating layers <NUM>. In this embodiment, the conductive composite layer <NUM> comprises six conductive layers <NUM> and five interlayer insulating layers <NUM>, and each interlayer insulating layer <NUM> is sandwiched between two adjacent conductive layers <NUM>. That is, the conductive layers <NUM> and the interlayer insulating layers <NUM> are stacked in a staggered manner (one conductive layer <NUM>/ one interlayer insulating layer <NUM>/ one conductive layer <NUM>/. / one conductive layer <NUM>/ one interlayer insulating layer <NUM>/ one conductive layer <NUM>). In this embodiment, the amount of the conductive layers <NUM> is different from the amount of the interlayer insulating layers <NUM>. However, in other embodiments, the amount of the conductive layers <NUM> can be equal to the amount of the interlayer insulating layers <NUM>, and the conductive layers <NUM> and the interlayer insulating layers <NUM> are still stacked in a staggered manner. In addition, the same kind of sublayers in the conductive composite layer <NUM> (e.g. the conductive layers <NUM> or the interlayer insulating layers <NUM>) can be formed with the same thickness or partially different thicknesses, or can be made of the same material or partially different materials.

In some embodiments, the sheet resistance of the conductive layer <NUM> is between <NUM> ohm per square (Ohm/sq) and <NUM> ohm per square (Ohm/sq), the thickness of the conductive layer <NUM> is between <NUM> and <NUM> (<NUM> ≤ the thickness of conductive layer <NUM> ≤ <NUM>), and the thickness of the interlayer insulating layer <NUM> is between <NUM> and <NUM>.

The above-mentioned conductive layer <NUM> comprises a conductive material, such as graphene, graphite, graphite nanoplatelet, carbon fiber, carbon nanotube, or any combination thereof. In other words, the conductive layer <NUM> can be a graphene layer, a graphite layer, a graphite nanoplatelet layer, a carbon fiber layer, or a carbon nanotube layer, or a layer made of any combinations of the above materials including graphene, graphite, graphite nanoplatelet, carbon fiber, and carbon nanotube. In this embodiment, since the materials, including graphene, graphite, graphite nanoplatelet, carbon fiber, and carbon nanotube, have good electromagnetic wave absorption ability, so that the conductive layer <NUM> can also have good electromagnetic wave absorption effect. As a result, the conductive composite layer <NUM> can have good electromagnetic wave absorption effect, too.

In some embodiments, the insulating layer <NUM> or the interlayer insulating layer <NUM> may also be a resin/ceramic mixture layer. Specifically, the material of the resin/ceramic mixture layer may include a polymer resin and ceramic powder. That is, the ceramic powder is mixed with the polymer resin to form the resin/ceramic mixture layer. The ceramic powder can be, for example but not limited to, alumina (Al<NUM>O<NUM>) ceramic powder, iron oxide (Fe<NUM>O<NUM>) ceramic powder, boron nitride (BN) ceramic powder, aluminum nitride (AlN) ceramic powder, silicon nitride (Si<NUM>N<NUM>) ceramic powder, or any combination thereof. In some embodiments, the insulating layer <NUM> or the interlayer insulating layer <NUM> may also be a resin/metal mixture layer. Specifically, the metal powder or metal powder that has undergone insulation treatment (i.e., the metal powder is formed with an insulating coating) can be mixed in the polymer resin to form a resin/metal mixture layer. Herein, the material of the metal powder can be, for example but not limited to, gold, aluminum, copper, nickel, palladium, platinum, zinc, silver, alloy materials (e.g. iron-silicon alloy, iron-silicon-aluminum alloy, or iron-silicon-chromium alloy, or any combination thereof. By adding ceramic powder, metal powder or metal powder that has undergone insulation treatment into the polymer resin, the insulating layer <NUM> or the interlayer insulating layer <NUM> can also have electromagnetic wave absorption effect.

In addition, the configurations and connections of components of the electromagnetic wave absorption structure 1a of this embodiment as shown in <FIG> are mostly the same as those of the electromagnetic wave absorption structure <NUM> of the previous embodiment. Different from the previous embodiment, the electromagnetic wave absorption structure 1a of this embodiment comprises at least two electromagnetic wave composite absorbing layers <NUM>, which are stacked and overlapped with each other. In this embodiment, for example, the electromagnetic wave absorption structure 1a comprises two electromagnetic wave composite absorbing layers <NUM>, which are stacked and overlapped with each other. In other embodiments, the amount of the electromagnetic wave composite absorbing layers <NUM> arranged in the electromagnetic wave absorption structure 1a can be more than two and less than or equal to ten. For example, the electromagnetic wave absorption structure may comprise three or more electromagnetic wave composite absorbing layers <NUM>, which are stacked and overlapped with each other. The amount of the stacked electromagnetic wave composite absorbing layers <NUM> in the electromagnetic wave absorption structure is not limited, and it can be designed based on the required electromagnetic wave absorption effect.

Each electromagnetic wave composite absorbing layer <NUM> comprises a conductive composite layer <NUM> and an insulating layer <NUM>, which is stacked and overlapped with the conductive composite layer <NUM>. Herein, the same kind of sublayers in two electromagnetic wave composite absorbing layers <NUM> can be the same or different. For example, the two conductive composite layers <NUM> of two electromagnetic wave composite absorbing layers <NUM>, respectively, can be made of the same material or different materials, and the thicknesses thereof can be the same or different. Similarly, the two insulating layers <NUM> of two electromagnetic wave composite absorbing layers <NUM>, respectively, can be made of the same material or different materials, and the thicknesses thereof can be the same or different. This disclosure is not limited, and the configuration of these layers can be determined based on the actual requirement.

The configurations and connections of components of the electromagnetic wave absorption structure 1b of this embodiment as shown in <FIG> are mostly the same as those of the electromagnetic wave absorption structure <NUM> or 1a of the previous embodiments. Different from the previous embodiments, the electromagnetic wave absorption structure 1b of this embodiment comprises four electromagnetic wave composite absorbing layers <NUM>, which are stacked and overlapped with each other.

In addition, the technical contents of the conductive composite layer <NUM> and the insulating layer <NUM> of the electromagnetic wave composite absorbing layer <NUM> and the conductive layers <NUM> and the interlayer insulating layers <NUM> of the conductive composite layer <NUM> in the electromagnetic wave absorption structure 1a or 1b can refer to the same components of the electromagnetic wave absorption structure <NUM> according to the previous embodiment, so the detailed descriptions thereof will be omitted.

The electromagnetic wave absorption structures according to different embodiments of this disclosure will be further described hereinafter.

In a first embodiment, the material of the conductive layer <NUM> comprises graphene (i.e., the conductive layer <NUM> is a graphene layer), and the thickness thereof is <NUM>. The thickness of the interlayer insulating layer <NUM> is <NUM>, and the material thereof comprises acrylic resin (i.e., the interlayer insulating layer <NUM> is an acrylic resin layer). <NUM> conductive layers <NUM> and <NUM> interlayer insulating layers <NUM> are stacked in a staggered manner to form a conductive composite layer <NUM> with a thickness of <NUM>. In addition, the thickness of the insulating layer <NUM> is <NUM>, and the material thereof comprises acrylic resin (i.e., the insulating layer <NUM> is an acrylic resin layer). Afterwards, the conductive composite layer <NUM> (<NUM>) and the insulating layer <NUM> (<NUM>) are stacked to form one electromagnetic wave composite absorbing layer <NUM>, and three electromagnetic wave composite absorbing layers <NUM> are stacked and overlapped to obtain an electromagnetic wave absorption structure with a total thickness of <NUM>.

In a second embodiment, the material of the conductive layer <NUM> comprises graphene (i.e., the conductive layer <NUM> is a graphene layer), and the thickness thereof is <NUM>. The thickness of the interlayer insulating layer <NUM> is <NUM>, and the material thereof comprises epoxy resin (<NUM>%) mixed with boron nitride (<NUM> %) (i.e., the interlayer insulating layer <NUM> is a resin/ceramic mixture layer). <NUM> conductive layers <NUM> and <NUM> interlayer insulating layers <NUM> are stacked in a staggered manner to form a conductive composite layer <NUM> with a thickness of <NUM>. In addition, the thickness of the insulating layer <NUM> is <NUM>, and the material thereof comprises epoxy resin (<NUM>%) mixed with iron oxide (<NUM> %) (i.e., the insulating layer <NUM> is a resin/ceramic mixture layer). Afterwards, the conductive composite layer <NUM> (<NUM>) and the insulating layer <NUM> (<NUM>) are stacked to form one electromagnetic wave composite absorbing layer <NUM>, and five electromagnetic wave composite absorbing layers <NUM> are stacked and overlapped to obtain an electromagnetic wave absorption structure with a total thickness of <NUM>.

Moreover, this disclosure further provides an electronic device, which comprises any of the above-mentioned electromagnetic wave absorption structures <NUM>, 1a and 1b, or any of their modifications. To be noted, the specific technical contents of the electromagnetic wave absorption structure <NUM>, 1a or 1b, or any of their modifications can refer to the above embodiments, so the detailed descriptions thereof will be omitted.

The electromagnetic wave absorption structure can be used to absorb the electromagnetic waves emitted by the components of electronic device to prevent excessive electromagnetic noise from interfering with other devices. In addition, the electromagnetic wave absorption structure can absorb the electromagnetic waves incident to the electronic device from the outside to avoid affecting the normal functions of the electronic device. Moreover, the electromagnetic wave absorption structure can reduce the intensity of the electromagnetic wave from the outside, so that the electronic device can pass the safety standard inspection withstanding the external electromagnetic waves. The above-mentioned electronic device may be a portable or fixed electronic device (e.g. a mobile phone, a tablet computer, a notebook computer, a wearable device, or the like), or the internal component, unit, or module of the aforementioned portable or fixed electronic device.

Claim 1:
An electromagnetic wave absorption structure, comprising:
at least two electromagnetic wave composite absorbing layers (<NUM>) stacked and overlapped with each other;
wherein each of the electromagnetic wave composite absorbing layers (<NUM>) comprises a conductive composite layer (<NUM>) and an insulating layer (<NUM>), and the insulating layer (<NUM>) is stacked and overlapped with the conductive composite layer (<NUM>),
wherein the conductive composite layer (<NUM>) comprises a plurality of conductive layers (<NUM>) and a plurality of interlayer insulating layers (<NUM>), and the conductive layers (<NUM>) and the interlayer insulating layers (<NUM>) are stacked in a staggered manner,
wherein the insulating layer (<NUM>) or one of the plurality of interlayer insulating layers (<NUM>) is a resin/ceramic mixture layer being formed by a ceramic powder mixed into a polymer resin or a resin/metal mixture layerbeing formed by a metal powder or the metal powder that has undergone insulation treatment mixed into a polymer resin,
wherein a thickness of the insulating layer (<NUM>) is between <NUM> and <NUM>.
wherein a thickness of the interlayer insulating layer (<NUM>) is between <NUM> and <NUM>.