WO2025206803A1 - Antenna device - Google Patents

Abstract

The present invention provides an antenna device comprising: a body; a signal pin coupled to the body so as to transmit a first signal to the inside of the body; a plurality of dielectrics stacked in the space formed inside the body; a first conductive pattern arranged on one surface of at least one from among the plurality of first dielectrics; and an end part arranged at one end of the body, wherein the plurality of dielectrics form a second signal transmitted to the outside in response to the first signal, the end part mediates the transmission of the second signal, and the first conductive pattern includes a frame, a patch arranged inside the frame, and at least one bridge for connecting the frame and the patch.

Description

antenna device

The present invention relates to an antenna device.

Radiofrequency (RF) hyperthermia focuses on raising the temperature of the target area to above 45°C. When the temperature reaches 45°C, collagen in the dermal layer is stimulated, tightening the skin.

Skin tightening technology focuses on generating heat in the dermis layer, approximately 2 to 4 mm deep.

However, most studies on RF hyperthermia have focused on tumor ablation or using electrodes to emit electromagnetic fields, which are highly ineffective.

The use of microwaves in skin tightening treatments has been shown to be effective in minimizing discomfort. However, the problem lies in their large effective area. Because microwaves spread widely, focusing on the target area becomes difficult, and there's a risk of unintended temperature increases.

Previous studies on RF hyperthermia technologies for skin tightening have used electrodes that generate electromagnetic fields. Electrodes for generating electromagnetic fields are advantageous for designing small, portable devices. However, many of these designs do not consider impedance matching, resulting in impedance mismatch issues that require higher power or longer treatment times to achieve the desired skin-tightening temperatures.

The technical problem to be solved by the present invention is to provide an antenna device that can apply an electromagnetic field concentrated on a specific area and is miniaturized to enhance convenience in using thermal therapy.

In order to solve the above technical problem, the present invention provides an antenna device including a body, a signal pin coupled to the body and transmitting a first signal to the inside of the body, a plurality of dielectrics stacked in a space formed inside the body, a first conductive pattern disposed on at least one surface of the plurality of first dielectrics, and an end portion disposed at one end of the body, wherein the plurality of dielectrics form a second signal transmitted to the outside in response to the first signal, the end portion mediates transmission of the second signal, and the first conductive pattern includes a frame, a patch disposed inside the frame, and at least one bridge connecting the frame and the patch.

The antenna device of the present invention may further include a second conductive pattern formed in a patch shape and arranged on at least one surface of the plurality of dielectrics.

The antenna device of the present invention may further include a second conductive pattern formed in a stripe shape and arranged on at least one surface of the plurality of dielectrics.

The plurality of dielectrics may include at least one first dielectric in which the first conductive pattern is formed, and at least one second dielectric in which the second conductive pattern is formed.

The first dielectric can be placed on top of the second dielectric.

The above first dielectric can be in contact with the above end.

The dielectric on which the second conductive pattern is arranged is a plurality of the second conductive patterns, and the number of stripes of the second conductive patterns may increase as they go toward the end.

The first and second challenge patterns can form the second signal together with the plurality of first dielectrics.

The signal pin can be inserted through the bottom surface of the body into the inside of the body.

The plurality of above-mentioned dielectrics may have a plurality of first via holes formed in the center and periphery.

The first and second conductors may have a plurality of second via holes formed in the center and periphery.

The antenna device of the present invention may further include a plurality of conductive pins inserted through the first and second via holes.

The above plurality of dielectrics may have a first via hole formed in the center.

The first and second conductors may have a second via hole formed in the center.

The antenna device of the present invention may further include a conductive pin inserted through the first and second via holes.

The present invention has the effect of increasing convenience in using thermal therapy by miniaturizing the device while allowing an electromagnetic field to be applied concentrated to a specific area.

Fig. 1 is an assembly diagram of an antenna device according to an embodiment of the present invention.

Figure 2 is an exploded view of an antenna device according to the first embodiment of the present invention.

Fig. 3 is a side view of an antenna device according to the first embodiment of the present invention.

Fig. 4 shows a dielectric and conductive pattern as a part of the antenna device of the first embodiment.

Figure 5 is an exploded view of an antenna device according to a second embodiment of the present invention.

Fig. 6 is a side view of an antenna device according to a second embodiment of the present invention.

Fig. 7 shows a dielectric and conductive pattern as a part of the antenna device of the second embodiment.

Figure 8 compares an antenna device with a meta structure filled inside a waveguide, a structure filled only with a dielectric instead of an internal structure, and a structure filled only with empty air without an internal structure, all at the same size.

Figure 9 shows the experimental results on the thermal performance by operation of an antenna device with a meta structure filled inside a waveguide.

The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description is omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is an assembly diagram of an antenna device (100) according to an embodiment of the present invention, FIG. 2 is an exploded view of an antenna device (100) according to a first embodiment of the present invention, FIG. 3 is a side view of an antenna device (100) according to a first embodiment of the present invention, FIG. 4 is a diagram showing a dielectric and a conductive pattern as a part of the antenna device (100) according to the first embodiment, FIG. 5 is an exploded view of an antenna device (100) according to a second embodiment of the present invention, FIG. 6 is a side view of an antenna device (100) according to a second embodiment of the present invention, and FIG. 7 is a diagram showing a dielectric and a conductive pattern as a part of the antenna device (100) according to the second embodiment.

Referring to FIGS. 1 to 7, an antenna device (100) according to an embodiment of the present invention will be described.

An antenna device (100) according to one embodiment of the present invention may be configured to include a body (110), a coaxial connector (120), an internal structure (130), and an end (150).

The body (110) can form the outer surface, inner surface, and bottom surface of the antenna device (100), respectively.

The outer and inner surfaces of the body (110) have the outer surface shape of a square pillar, and the outer and inner surfaces can be connected to have a certain thickness.

The z-axis (longitudinal direction, upward direction in the drawing) end of the body (110) has an opening. The opening and the inner space are defined as a space (111) defined by the body (110). The opening can be formed to have a size corresponding to the area of the first dielectric (131) or the first dielectric (131) and the second dielectric (132) arranged in the space (111).

The first space (111) and the portion of the body (110) surrounding the first space (111) can function as a waveguide.

A mounting groove (113) may be formed at one end of the z-axis of the body (110). The mounting groove (113) provides a space in which the end (150) can be mounted, and a portion of the body (110) surrounding the outside of the mounting groove (113) defines the horizontal plane position of the end (150).

A coaxial connector (120) can be coupled to the outer surface of the body (110).

The body (110) is formed of a metal material. For example, the body (110) may be formed of copper (Cu), silver (Ag), etc.

The coaxial connector (120) is for transmitting an electromagnetic signal and is coupled to the outer surface or lower surface of the body (110).

A coaxial connector (120) may be configured to include a signal pin (121), an insulator (122), and a housing (123).

Here, the signal pin (121) is placed inside the insulator (122), and one end can be exposed to the outside.

The signal pin (121) placed inside the insulator (122) is accommodated in the housing (123) and the end can be exposed to the outside.

The signal pin (121) can be inserted through the bottom surface of the body (110) into the inside of the body (110).

Accordingly, the signal pin (121) can transmit the first signal into the space (111). That is, the signal pin (121) can be inserted into the waveguide to transmit the first signal.

A plurality of first dielectrics (131) and second dielectrics (132) can form a second signal transmitted to the outside in response to the first signal.

The signal pin (121) can be coupled in a form that penetrates the first dielectric (131) and the second dielectric (132).

A via hole (131a) may be formed at the center of a plurality of first dielectrics (131) and second dielectrics (132). Here, a signal pin (121) may be arranged to penetrate the via hole (131a).

The coaxial connector (120) may be an SMA (Sub-Miniature version A) connector.

The internal structure (130) is placed in the space (111), which is the inner space formed by the body (110). The internal structure (130) can be understood as being placed inside the waveguide.

The internal structure (130) may be composed of a laminated structure of a dielectric (131, 132) and a conductive pattern (141, 142), but may also include a dielectric that does not include a conductive pattern (141, 142, 143). In the description of the present invention, a structure including a dielectric (131, 132) will be described.

The first dielectric (131) and the second dielectric (132) may be of the same material, but do not necessarily have to be the same.

The first dielectric (131) and the second dielectric (132) may be, for example, Tefron, but are not limited thereto.

A conductive pattern (141, 142, 143) can be arranged and formed on one side of the first dielectric (131) and the second dielectric (132).

Here, one side of the first dielectric (131) and the second dielectric (132) may be in the longitudinal direction, the direction of propagation of electromagnetic waves, or the upward direction in the drawing.

The challenge pattern (141, 142, 143) can form the second signal together with a plurality of dielectrics (131, 132).

The dielectrics (131, 132) in which the challenge patterns (141, 142, 143) are arranged and formed can form a pattern in which multiple ones are stacked in the longitudinal direction. This structure can be said to be a waveguide filled with a meta structure formed inside the waveguide.

The challenge patterns (141, 142, 143) may be formed of copper (Cu), but are not necessarily limited thereto.

Referring to FIG. 4, an antenna device (100) according to the first embodiment of the present invention may be configured to include a first conductive pattern (141) and a second conductive pattern (142).

Referring to FIG. 7, an antenna device (100) according to the second embodiment of the present invention may be configured to include a first conductive pattern (141) and a third conductive pattern (143).

Referring to FIGS. 4 and 7, the first challenge pattern (141) may be configured to include a frame (141a), a patch (141b) disposed inside the frame (141a), and at least one bridge (141c) connecting the frame (141a) and the patch (141b).

Here, the frame (141a) may be formed in a square frame shape, but is not limited thereto. Furthermore, the patch (141b) may be formed in a square plate shape, but is not limited thereto. Furthermore, the bridge (141c) may connect the center of each side of the patch (141b) to the center of each inner side of the frame (141a). For example, the bridge (141c) may be formed in four pieces when the frame (141a) has a square frame shape and the patch (141b) has a square plate shape.

Referring to FIG. 4, the second challenge pattern (142) is arranged on at least one surface of the plurality of dielectrics (131, 132) and may be formed in a patch shape.

For example, the second challenge pattern (142) may be formed in a square plate shape, but is not limited thereto.

Referring to FIG. 7, the third challenge pattern (143) is arranged on at least one surface of the plurality of dielectrics (131, 132) and may be formed in a striped shape.

For example, the third challenge pattern (143) may be formed by arranging a plurality of square plates of a certain thickness at a certain interval, but is not limited thereto.

Referring to FIG. 2, the plurality of dielectrics (131, 132) may include a first dielectric (131) in which a first conductive pattern (141) is formed, and at least one second dielectric (132) in which a second conductive pattern (142) is formed.

The first dielectric (131) may be placed on top of the second dielectric (132). Here, the first dielectric (131) may be in contact with the end (150).

Referring to FIG. 5, the plurality of dielectrics (131, 132) may include a first dielectric (131) in which a first conductive pattern (141) is formed, and at least one second dielectric (132) in which a third conductive pattern (143) is formed.

The first dielectric (131) may be placed on top of the second dielectric (132). Here, the first dielectric (131) may be in contact with the end (150).

When there are multiple second dielectrics (132) on which the third challenge pattern (143) is arranged, the number of stripes of the third challenge pattern (143) may increase as it goes toward the end (150).

Referring to FIGS. 2 and 4, a plurality of dielectrics (131, 132) may have a plurality of first via holes (131a) formed in the center and the periphery. For example, one first via hole (131a) may be formed in the center, and four first via holes (131a) may be formed symmetrically at a certain interval from the center, but the present invention is not limited thereto.

Likewise, the first conductor (141) and the second conductor (142) may have a plurality of second via holes (141d, 142a) formed in the center and periphery. Here, the plurality of second via holes (141d, 142a) may be formed at positions corresponding to the first via holes (131a).

A conductive layer can be formed on the center of both sides of the plurality of dielectrics (131, 132) and the first via hole (131a), and the plurality of dielectrics (131, 132) can be electrically connected to each other through the conductive layer.

A signal pin (121) can be inserted through a first via hole (131a) formed in the center of a plurality of dielectrics (131, 132) and a first conductor (141) and a second conductor (142) formed in the center of a plurality of second via holes (141d, 142a).

A plurality of conductive pins (146) can be inserted through a plurality of second via holes (141d, 142a) formed in the center and periphery of the first via hole (131a) and the first conductor (141) and the second conductor (142) formed in the center and periphery of the plurality of dielectrics (131, 132).

Referring to FIGS. 5 and 7, a plurality of dielectrics (131, 132) may have a first via hole (131a) formed in the center.

Likewise, the first conductor (141) and the third conductor (143) may have second via holes (141d, 143a) formed in the center. Here, a plurality of second via holes (141d, 143a) may be formed at positions corresponding to the first via holes (131a).

A conductive layer can be formed on the center of both sides of the plurality of dielectrics (131, 132) and the first via hole (131a), and the plurality of dielectrics (131, 132) can be electrically connected to each other through the conductive layer.

A first via hole (131a) formed in the center of a plurality of dielectrics (131, 132) and a first conductor (141) and a second conductor (142) can have a conductive pin (145) and a signal pin (121) inserted through a plurality of second via holes (141d, 142a) formed in the center.

The end (150) is connected to one end of the body (110).

The end (150) is formed of a dielectric and mediates the transmission of electromagnetic wave signals.

For example, the first end (150) may include a sapphire material.

A first signal injected into space (111) by a coaxial connector (120) forms a second signal transmitted to the outside by a waveguide formed by an internal structure (130), and the second signal can be transmitted to the outside via an end (150).

Additionally, the end (150) can come into direct contact with human skin when the antenna device (100) of the present invention is used as a heating device.

Figure 8 compares an antenna device with a meta structure filled in a waveguide (structure A), a structure filled only with a dielectric instead of a meta structure (structure B), and a structure filled only with empty air without a meta structure (structure C) at the same size.

In structure B, the dielectric is made of Teflon.

The C structure had a resonant frequency of about 12 GHz, the B structure had a resonant frequency of 6.4 GHz, and the A structure had a resonant frequency of 2.45 GHz. It can be seen that the antenna device (100) including the metastructure requires a smaller resonant frequency in the same size, or a smaller size to achieve the same resonant frequency.

Waveguides containing metastructures can be designed to be miniaturized by reducing their size by 98.8% compared to waveguides filled only with air to achieve the same resonant frequency.

This miniaturized design means that the antenna device (100) can be usefully applied in a realistic size to RF treatment or treatment systems, such as high-frequency thermal devices.

In addition, examining the electric field distribution of Fig. 8, Structure A exhibited a strong upward electric field distribution and a weak rearward electric field distribution in the near field. This means that when the present invention is used as a heating device, the heating effect is limited to one direction, ensuring not only the therapeutic effect but also the safety of the user or practitioner.

Figure 9 shows the experimental results on the thermal performance by operation of an antenna device filled with a meta structure in a waveguide.

Figure 9a shows the surface temperature of pork at various operating powers and times. The antenna device (100) was connected to an RF generator with a frequency of 2.45 GHz by a coaxial connector (120). The antenna device (100) was positioned 4 mm above the pork phantom, and the temperature sensor was positioned 4 mm below the pork skin surface, respectively. The effective area of heating by microwaves in the pork phantom was found to be 18 mm × 14 mm, which is a very narrow and concentrated area.

Figure 9b compares the simulated and measured temperatures at a location 4 mm below the skin surface. The simulation was performed using the Sim4Life platform, applying a human face model, while the measured results were for pork, as described in Figure 13a. In the human model simulation, temperatures were increased by 35.4°C and 11.6°C, respectively, within 60 seconds using RF powers of 80 W and 20 W, respectively.

Figure 9c shows the results of thermal therapy using an antenna device (100) on a human face (top) and stomach (bottom). The subject was a 27-year-old male, and the antenna aperture was positioned 5 to 8 mm away from the face/stomach. The RF input was 2.45 GHz and 20 W. The face/stomach temperature before thermal therapy was approximately 32°C, but after 60 seconds, the temperature of the target area increased to approximately 45°C.

The temperature rise results for pork and human face/stomach were found to be similar.

division Type Frequency (GHz) Invasiveness Power (W) Temperature rise (time required) Target Comparative Example 1 monopole 2.45 Invasion 2.5 10 ℃ (1500 s) Deep sunlight Comparative Example 2 Dipole 0.434 Non-invasive 5 10 ℃ (3600 s) shallow tumors Comparative Example 3 electrode 0.448 Non-invasive 200 11.1 ℃ (600 s) Subcutaneous fat Comparative Example 4 electrode 0.001 Non-invasive 65 10 ℃ (180 s) Skin tightening Example metamaterials 2.45 Non-invasive 20/80 11.6/35.4 ℃ (60 s) Skin tightening

[Table 1] compares thermal therapy using comparative examples and thermal therapy using the antenna device (100) of the present invention.

Referring to [Table 1], when 2.45 GHz and low power of 2.5 W were used for deep tumor treatment using an invasive method, a relatively long time of 1500 s was required for a temperature increase of 10 ℃ (Comparative Example 1), and a non-invasive method for shallow tumor treatment required more time (Comparative Example 2).

In the case of electrode hyperthermia therapy using a relatively high power of 200 W as a non-invasive method, the temperature could be raised by about 10°C in a relatively short time of 600 s (Comparative Example 3), and in the case of using 65 W of power, the temperature could be raised by about 10°C in 180 s (Comparative Example 4).

In comparison, the antenna device (100) of the present invention can raise the temperature of only a narrow target area by 11.6°C or 35.4°C within 60 seconds with a low power of 20 W or 80 W, and thus it can be seen that it has the fastest and most efficient heating performance compared to comparative examples.

The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. In this application, terms such as "comprise" or "have" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood to not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Claims (15)

body; A signal pin coupled to the body and transmitting a first signal to the inside of the body; A plurality of dielectrics stacked in a space formed inside the body; A first conductive pattern disposed on at least one side of the plurality of dielectrics; and Including a section disposed at one end of the above body, The above plurality of genetic materials form a second signal transmitted to the outside in response to the first signal, The above-mentioned section mediates the transmission of the second signal, The above first challenge pattern is frame; Patches placed inside the frame; and comprising at least one bridge connecting the above frame and patch; Antenna device. In the first paragraph, A second conductive pattern arranged on at least one side of the plurality of dielectrics and formed in a patch shape An antenna device further comprising: In the first paragraph, A second conductive pattern arranged on at least one side of the plurality of dielectrics and formed in a striped shape An antenna device further comprising: In the second or third paragraph, The above multiple genomes are At least one first dielectric on which the first challenge pattern is formed; and At least one second dielectric material in which the second challenge pattern is formed Antenna device. In paragraph 4, The above first genome Placed on the upper part of the second dielectric Antenna device. In paragraph 4, The above first dielectric is in contact with the above end Antenna device. In the third paragraph, The above-mentioned dielectrics in which the second challenge pattern is arranged are plural, The above second challenge pattern is The number of stripes increases as you go towards the upper end. Antenna device. In the second or third paragraph, The above first and second challenge patterns are Forming the second signal together with the plurality of first genetic materials Antenna device. In the first paragraph, The above signal pin is Penetratingly inserted into the inside of the body from the bottom surface of the body Antenna device. In the second paragraph, The above multiple genomes are Multiple first via holes are formed in the center and periphery. Antenna device. In paragraph 10, The first and second conductors above Multiple second via holes are formed in the center and periphery. Antenna device. In paragraph 11, A plurality of conductive pins inserted through the first and second via holes An antenna device further comprising: In the third paragraph, The above multiple genomes are The first via hole is formed in the center. Antenna device. In paragraph 13, The first and second conductors above A second via hole is formed in the center. Antenna device. In paragraph 14, A conductive pin inserted through the first and second via holes An antenna device further comprising: