KR20240013641A - Antenna module - Google Patents

Abstract

An antenna module according to an embodiment of the present invention includes a substrate, a ground plate formed on one side of the substrate, a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other, and the first antenna and the A stub disposed between second antennas and connected to the ground plate, the stub comprising: a first extension connected to the ground plate; a second extension extending from an end of the first extension toward the first antenna; It includes an extension part and a third extension part extending from an end of the first extension part toward the second antenna, and the length of the second extension part is different from the length of the third extension part.

Description

Antenna module {Antenna module}

The present invention relates to an antenna module, and more specifically, to an antenna module with a high degree of isolation between antennas.

Due to the structure of the battery pack, the two antennas located on the master can be located close to each other. Since interference may occur between antennas located in close proximity, separation distance adjustment methods, insertion of decoupling circuits, suspended line design, etc. can be applied to reduce interference between antennas. In the case of adjusting the distance between antennas, isolation can be secured, but it has the disadvantage of increasing the size of the master board (Master B'D). When using decoupling circuits or suspended line technology, it is only possible for narrow-band frequencies, and multi-band It is difficult to apply to multi-band or broad-band.

Public Patent Publication No. 10-2006-0129910

The technical problem to be solved by the present invention is to provide an antenna module with a high degree of isolation between antennas.

In order to solve the above technical problem, an antenna module according to an embodiment of the present invention includes a substrate; a ground plate formed on one side of the substrate; a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other; and a stub disposed between the first antenna and the second antenna and connected to the ground plate, wherein the stub includes a first extension portion connected to the ground plate, and a first extension portion at an end of the first extension portion. It includes a second extension portion extending toward the antenna and a third extension portion extending from an end of the first extension portion toward the second antenna, and the length of the second extension portion is different from the length of the third extension portion.

Additionally, the distance of the first extension from the first antenna may be different from the distance from the second antenna of the first extension.

In addition, the stub has a fourth extension extending toward the ground plate from an end of the second extension that is not connected to the first extension, and a fourth extension that extends toward the ground plate and an end of the third extension that is not connected to the second extension. It may further include a fifth extension part extending toward the ground plate, and the fourth extension part and the fifth extension part may have the same length.

Additionally, the substrate may include a first depression and a second depression in areas where the first antenna and the second antenna are formed, respectively.

Additionally, the stub may be located in a protruding area between the first depression and the second depression.

Additionally, the location of the first extension may vary depending on the shape of the substrate.

Additionally, the first antenna and the second antenna may radiate signals in the same frequency band.

Additionally, the stub may be mounted in a pattern on the substrate.

In order to solve the above technical problem, an antenna module according to another embodiment of the present invention includes a substrate; a ground plate formed on one side of the substrate; a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other; and a stub disposed between the first antenna and the second antenna and connected to the ground plate, wherein the stub includes a first extension connected to the ground plate, and a first antenna at an end of the first extension. It includes a second extension portion extending toward and a third extension portion extending from an end of the first extension toward the second antenna, and the shortest distance from the first antenna to the first extension portion is from the second antenna. It is different from the shortest distance to the first extension, and the shortest distance from the first antenna to the second extension is the same as the shortest distance from the second antenna to the third extension.

In order to solve the above technical problem, an antenna module according to another embodiment of the present invention includes a substrate; a ground plate formed on one side of the substrate; a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other; and a stub disposed between the first antenna and the second antenna and connected to the ground plate, wherein the stub includes a first extension connected to the ground plate, and a first antenna at an end of the first extension. a second extension portion extending toward and a third extension portion extending from an end of the first extension toward the second antenna, and the S21 parameter for the second antenna of the first antenna is the first antenna or It has a minimum value that is the minimum value in the bandwidth section of the second antenna.

Additionally, the bandwidth of the first antenna or the second antenna may be 2.4 to 2.5 GHz.

According to embodiments of the present invention, the ground plane current distribution can be changed by designing a ground stub, and through this, each antenna can be operated as an independent ground plane to improve isolation. In addition, it is possible to freely design to the required frequency and broadband frequency, and stable communication performance can be secured in the internal environment of the battery pack by improving the performance of each antenna. Furthermore, it can be designed according to the ground environment and can function as a filter (BPF, BSF, etc.). Multiple antennas can be applied, and performance can be maintained as it does not affect the return loss (RL) characteristics. By applying the ground plane stub, the current flow is concentrated in the stub, reducing interference between antennas, ensuring isolation and maintaining antenna performance. possible. Additionally, the size of the PCB and module to be designed can be reduced.

Figure 1 shows an antenna module according to an embodiment of the present invention.
Figures 2 and 3 specifically illustrate an antenna module according to an embodiment of the present invention.
Figure 4 is a diagram showing the length of each component of the antenna module according to an embodiment of the present invention.
5 and 6 are diagrams comparing an antenna module according to an embodiment of the present invention and an antenna module according to a comparative example of the present invention.

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

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining or replacing.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

Additionally, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular may also include the plural unless specifically stated in the phrase, and when described as "at least one (or more than one) of A and B and C", it is combined with A, B, and C. It can contain one or more of all possible combinations.

Additionally, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component.

And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, that component is directly 'connected', 'coupled', or 'connected' to that other component. In addition to cases, it may also include cases where the component is 'connected', 'coupled', or 'connected' by another component between that component and that other component.

Additionally, when described as being formed or disposed “on top” or “bottom” of each component, “top” or “bottom” means that the two components are directly adjacent to each other. This includes not only the case of contact, but also the case where one or more other components are formed or disposed between the two components. In addition, when expressed as “top” or “bottom,” the meaning of not only the upward direction but also the downward direction can be included based on one component.

Figure 1 shows an antenna module according to an embodiment of the present invention. Figures 2 and 3 specifically illustrate an antenna module according to an embodiment of the present invention, Figure 4 is a diagram showing the length of each component of the antenna module according to an embodiment of the present invention, and Figures 5 and 6 are This is a diagram comparing an antenna module according to an embodiment of the present invention and an antenna module according to a comparative example of the present invention.

The antenna module 100 according to an embodiment of the present invention is composed of a substrate 110, a first antenna 120, a second antenna 130, a stub 140, and a ground plate 150.

The antenna module 100 according to an embodiment of the present invention may be an antenna module that constitutes a master board of a battery pack, or may be an antenna module of a WBMS (Wireless Battery Management System) capable of wireless communication. The antenna module 100 may include a control unit, communication unit, communication module, power unit, IC or RLC element, etc. In addition, it can be applied to various antenna modules where two antennas are in close proximity.

The substrate 110 may be a printed circuit board (PCB) or a dielectric board. The substrate 110 may have a flat shape and may have various shapes depending on the environment in which the antenna module 100 of the substrate 110 is applied.

The ground plate 150 is formed on one side of the substrate 110. The ground plate 150 may be disposed on at least a portion of one side of the substrate 110 . The ground plate 150 may be formed on the top layer of the substrate 110. The ground plate 150 may be directly connected to the ground portion of the connector connected to the outside, or may be connected to the ground layer inside the substrate connected to the ground portion of the connector through a via, etc. to form the ground of the substrate 110. The substrate 110 may be formed by stacking a ground plate 150 including a metal layer such as copper that forms a ground on one surface of a dielectric layer such as FR-4.

The first antenna 120 and the second antenna 130 are formed on one side of the substrate and arranged to be spaced apart from each other. The first antenna 120 and the second antenna 130 are each connected to a communication module and can radiate signals output from each communication module to the outside. Here, the communication module is a wireless communication module, and may be an RF communication module or various wireless communication modules. The first antenna 120 and the second antenna 130 may radiate signals in the same frequency band. The first antenna 120 and the second antenna 130 may be connected to the same type of communication module. The antenna module 100 is an antenna module of the master module for WBMS, and one of the first antenna 120 and the second antenna 130 transmits and receives signals for communication with the outside, and the other one transmits and receives signals for communication with the slave module. You can transmit and receive signals for. Here, the bandwidth of the first antenna 120 or the second antenna 130 may be 2.4 to 2.5 GHz. The first antenna 120 and the second antenna 130 may radiate signals of the same frequency, and one of the first antenna 120 and the second antenna 130 is the main antenna, and the other is a redundancy antenna. ) It could be an antenna.

Alternatively, the first antenna 120 and the second antenna 130 may radiate signals in different frequency bands or may radiate signals in frequency bands that partially overlap with each other.

The first antenna 120 and the second antenna 130 may be disposed close to one side of the substrate 110, that is, on the same side of the substrate 110. The first antenna 120 and the second antenna 130 may be placed close to each other even if they are not on the same side. Depending on their proximity, the first antenna 120 and the second antenna 130 may interfere with each other. In order to increase the degree of isolation between the first antenna 120 and the second antenna 130, a stub 140 may be formed.

The stub 140 is disposed between the first antenna 120 and the second antenna 130 and is connected to the ground plate 150. A stub is an additional line in addition to the main sub-signal line, and the stub 140 is disposed between the first antenna 120 and the second antenna 130. At this time, the stub 140 is connected to the ground plate 150. The stub 140 is connected to the ground plate 150 and can be referred to as a ground stub. By disposing the stub 140 forming a ground stub between the first antenna 120 and the second antenna 130, the degree of isolation between the first antenna 120 and the second antenna 130 can be increased.

One side of the substrate 110 may include a first depression 111 and a second depression 112 in areas where the first antenna 120 and the second antenna 130 are formed, respectively. Recesses 111 and 112 that are recessed into the inside of the substrate 110 may be formed in each area where the first antenna 120 and the second antenna 130 are formed. The first antenna 120 and the second antenna 130 may be located within the depression area formed by the depression. The outermost sides of the first antenna 120 and the second antenna 130 may be formed at positions corresponding to the outside of the substrate 110 . The outermost sides of the first antenna 120 and the second antenna 130 in the first direction toward one side of the substrate 110 protrude to a position corresponding to the outermost side of one side of the substrate 110, forming depressions 111 and 112. ) can be placed in. Alternatively, the outermost sides of the first antenna 120 and the second antenna 130 in the first direction may be located inside or outside the outermost side of one side of the substrate 110 . The first antenna 120 and the second antenna 130 can be formed by performing a fill cut process on the substrate 110 to form an open cavity space.

The depressions 111 and 112 may be formed through processes such as cutting and etching of the substrate 110 and the ground plate 150 to form empty spaces. At this time, the substrate corresponding to the area where each antenna 120 and 130 is placed may not be caved in, and each antenna 120 and 130 may be mounted on the corresponding substrate area. At this time, each antenna 120 and 130 may be formed in a pattern, but may be formed in a meander shape.

The first antenna 120 is disposed in the first depression 111, but an empty space in which the substrate 110 is not located may be formed on both sides of the first antenna 120, and the empty space may be formed in the 1-1 It can be called a depression and a 1-2 depression. The second antenna 130 is disposed in the second depression 112, but an empty space in which the substrate 110 is not located may be formed on both sides of the second antenna 130, and the empty space may be formed in the 2-1 It can be called a depression and a 2-2 depression.

Both inner corners of each depression 111 and 112 may be rounded. Edges where the depressions 111 and 112 contact the substrate 110 may also be rounded.

The stub 140 may be located in the protruding area 113 between the first depression 111 and the second depression 112. The protruding area 113 of the substrate 110, which is not depressed between the first depression 111 and the second depression 112 and has a protruding shape, is formed between the first depression 111 and the second depression 112. ), and the stub 140 may be disposed on the protruding area 113. Edges where the protruding area 113 and both recessed portions 111 and 112 contact each other may be rounded. The protruding area 113 may be formed by removing a metal layer and exposing a dielectric layer. At this time, the protruding area can be formed through copper cut.

The stub 140 may be mounted on the protruding area 113. At this time, the stub 140 may be mounted in a pattern on the protruding area 113 of the substrate 110 through a patterning process.

The stub 140 is composed of a first extension part 141, a second extension part 142, and a third extension part 143, and includes a fourth extension part 144 or a fifth extension part 145. can do.

The first extension 141 is connected to the ground plate 150. The first extension portion 141 is connected to the ground plate 150 formed on the substrate 110 and extends from the ground plate 150 in a first direction that is outside the substrate 110.

The second extension part 142 extends from the end of the first extension part 141 toward the first antenna 120, and the third extension part 143 extends from the end of the first extension part 141 toward the second antenna 120. It can be extended towards (130). The second extension part 142 and the third extension part 143 extend from the outermost side, that is, the end, of the first extension part 141 in the first direction, and include a first antenna 120 and a second antenna, respectively ( 130). That is, they may branch from the end of the first extension portion 141 and extend in opposite directions. At this time, the second extension 142 extends in the second direction, which is the direction toward the first antenna 120, and the third extension 143 extends in the opposite direction of the second direction, which is the direction toward the second antenna 130. can be extended in any direction. Here, the second direction may be perpendicular to the first direction. The second extension part 142 and the third extension part 143 may extend along the outermost side of the protruding area 113 and may be located on the outermost side of the protruding area 113.

The length of the second extension 142 may be different from the length of the third extension 143. The length of the third extension part 143 may be longer than the length of the second extension part 142. Alternatively, the length of the second extension part 142 may be longer than the length of the third extension part 143.

The distance of the first extension part 141 from the first antenna 120 may be different from the distance of the first extension part 141 from the second antenna 130. In addition, the shortest distance from the first antenna 120 to the first extension 141 is different from the shortest distance from the second antenna 130 to the first extension 141, and the shortest distance from the first antenna 120 to the first extension 141 is different from the shortest distance from the first antenna 120 to the first extension 141. 2 The shortest distance to the extension part 142 may be the same as the shortest distance from the second antenna 130 to the third extension part 143. The second extension part 142 and the third extension part 143 extend from the end of the first extension part 141, and when the first extension part 141 is disposed close to the first antenna 120, If the length of the third extension part 143 is longer than the length of the second extension part 142 and the first extension part 141 is disposed close to the second antenna 130, the length of the second extension part 142 The length may be longer than that of the third extension portion 143.

Alternatively, even if the first extension part 141 is disposed close to the first antenna 120, the length of the second extension part 142 is longer than the length of the third extension part 143, or the length of the first extension part 141 Even if it is disposed close to the second antenna 130, the length of the third extension part 143 may be longer than the length of the second extension part 142. Alternatively, even if the distance of the first extension part 141 from the first antenna 120 is different from the distance from the second antenna 130 of the first extension part 141, the length of the second extension part 142 The length of the third extension part 143 may be the same.

Alternatively, the distance of the first extension 141 from the first antenna 120 may be the same as the distance from the second antenna 130 of the first extension 141.

The position of the first extension 141 may vary depending on the shape of the substrate 110. The current distribution of the ground plane can be formed according to the shape of the substrate 110, and the stub 140 can improve the isolation of the first antenna 120 and the second antenna 130 by changing the current distribution of the ground plane. You can. In order to change the current distribution of the ground plane, the position of the first extension 141 may be set according to the shape of the substrate 110, the design of the antenna module 100, and the ground environment.

The fourth extension portion 144 may extend from an end of the second extension portion 142 that is not connected to the first extension portion 141 toward the ground plate 150 . The fourth extension part 144 may extend from the end of the second extension part 142 toward the inside of the ground plate 150, that is, the substrate 110. Here, the inner direction of the substrate 110 may be opposite to the first direction. The fourth extension part 144 may extend the length of the second extension part 142.

The fifth extension portion 145 may extend from an end of the third extension portion 143 that is not connected to the first extension portion 141 toward the ground plate 150 . The fifth extension part 145 may extend from the end of the third extension part 143 toward the inside of the ground plate 150, that is, the substrate 110. Here, the inner direction of the substrate 110 may be opposite to the first direction. The fifth extension part 145 may extend the length of the third extension part 143.

The fourth extension part 144 and the fifth extension part 145 may have the same length. The fourth extension part 144 and the fifth extension part 145 may extend toward the ground plate 150 by the same length and be spaced apart from the ground plate 150 at the same distance. Alternatively, the fourth extension part 144 and the fifth extension part 145 may have different extending lengths.

The first extension part 141, the second extension part 142, the third extension part 143, the fourth extension part 144, and the fifth extension part 145 may be extended in a straight line, zigzag or It can be extended into various forms, such as a meander shape. Additionally, an additional extension extending in one direction may be formed at the end of the fourth extension 144 or the fifth extension 145.

An antenna module according to an embodiment of the present invention includes a substrate 110, a ground plate 150 formed on one side of the substrate 110, a first antenna 120 formed on one side of the substrate 110 and spaced apart from each other, and It includes a second antenna 130 and a stub 140 disposed between the first antenna 120 and the second antenna 130 and connected to the ground plate 150, and the stub 140 is connected to the ground plate 150. A first extension part 141 connected to, a second extension part 142 extending from the end of the first extension part 141 toward the first antenna 120, and a second extension part 142 extending from the end of the first extension part 141. 2 It includes a third extension portion 143 extending toward the antenna 130, and the S21 parameter for the second antenna 130 of the first antenna 120 is the first antenna 120 or the second antenna 130. ) can have a minimum value that is the minimum value in the bandwidth section. Here, the bandwidth of the first antenna 120 or the second antenna 130 may be 2.4 to 2.5 GHz.

The stub 140 is disposed between the first antenna 120 and the second antenna 130 to change the ground plane current distribution, thereby improving the isolation between the first antenna 120 and the second antenna 130. By forming the stub 140, the S21 parameter, which is the S parameter for the second antenna 130 of the first antenna 120, is set to a minimum value that is the minimum value in the bandwidth section of the first antenna 120 or the second antenna 130. Therefore, the degree of isolation can be improved by reducing interference in the bandwidth section. Here, the S21 parameter is a parameter indicating the degree to which the signal radiated from the first antenna 120 is induced to the second antenna 130, that is, the degree to which the first antenna 120 influences the second antenna 130. am. This can be called isolation.

After designing an antenna corresponding to the communication frequency to be radiated from the antenna module 100 (λ/4), the shape and position of the stub 140 can be set. The current distribution of the ground plane can be changed through the stub 140, so it can be applied to various frequencies, including broadband frequencies, and the stub 140 can be designed according to the ground environment. The stub 140 may function as a filter. At this time, BPF, BSF, LPF, HPF, etc. can be implemented depending on the shape of the stub 140.

The stub 140 according to an embodiment of the present invention may be formed with numbers D1 to D7 as shown in FIG. 4. D1 is the separation distance between the first antenna 120 and the second antenna 130, D2 is the line width of the stub 140, D3 is the length of the first extension 141, and D4 is the second extension ( 142), D5 is the length of the third extension 143, D6 is the total length of the second extension 142 and the third extension 143, and D7 is the length of the fourth extension 144. You can. D7 may be the length of the fifth extension portion 145.

For example, D1 may be 24.7 mm, D2 may be 0.6 mm, D3 may be 4.4 mm, D4 may be 1.2 mm, D5 may be 11.7 mm, D6 may be 14.7 mm, and D7 may be 2.4 mm.

5 and 6 compare the antenna module according to the embodiment of the present invention and the antenna module according to the comparative example of the present invention. Case 1 is the first antenna feed of the antenna module implemented as shown in FIG. 4. This shows the current distribution. Case 2 is the current distribution when the stub is not formed, and case 3 is the current distribution when the distance from the first antenna of the first extension is the same as the distance from the second antenna of the first extension. This is the current distribution. As shown in Figure 5, in case 1, it can be confirmed that the signal is properly radiated only from the supplied first antenna. On the other hand, in cases 2 and 3, it can be confirmed that the first antenna and the second antenna isolation are low, so the signal from the first antenna is transmitted to the second antenna.

The S21 parameters for each case are shown in Figure 6, and it can be seen that case 1 has a minimum value (620), which is the minimum value in the frequency band of 2.4 to 2.5 GHz (610), and compared to case 2, which does not form a stub - It can be seen that the isolation between antennas is improved by 13 dB from 10 dB to -23 dB.

As described above, by forming a stub between the first antenna and the second antenna, the ground plane current distribution can be changed by designing the ground stub. Through this, each antenna can be operated as an independent ground plane to improve isolation. In addition, it is possible to freely design to the required frequency and broadband frequency, and stable communication performance can be secured in the internal environment of the battery pack by improving the performance of each antenna. Furthermore, it can be designed according to the ground environment and can function as a filter (BPF, BSF, etc.). Multiple antennas can be applied, and performance can be maintained as it does not affect the return loss (RL) characteristics. By applying the ground plane stub, the current flow is concentrated in the stub, reducing interference between antennas, ensuring isolation and maintaining antenna performance. possible. Additionally, the size of the PCB and module to be designed can be reduced.

The battery management system that manages the battery according to an embodiment of the present invention includes a battery management unit that manages charging and discharging of the battery and an antenna module that performs wireless communication with another battery management system or the outside. The detailed description of the antenna module included in the battery management system corresponds to the detailed description of the antenna module of FIGS. 1 to 6, and redundant description will be omitted.

A battery pack according to an embodiment of the present invention includes at least one battery cell and a battery management system that manages charging and discharging of the battery cell, and the battery management system includes a battery management unit that manages charging and discharging of the battery and another battery manager. It includes an antenna module that performs wireless communication with the system or the outside. The detailed description of the antenna module included in the battery management system corresponds to the detailed description of the antenna module of FIGS. 1 to 6, and redundant description will be omitted.

The antenna module included in the battery management system or batch processing pack includes a substrate, a ground plate formed on one side of the substrate, a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other, and the first antenna and A stub disposed between the second antennas and connected to the ground plate, the stub comprising: a first extension connected to the ground plate; a first extension extending from an end of the first extension toward the first antenna; It includes two extension parts and a third extension part extending from an end of the first extension part toward the second antenna, and the length of the second extension part is different from the length of the third extension part.

Additionally, the distance from the first antenna of the first extension may be different from the distance from the second antenna of the first extension, and the stub may be located at an end of the second extension that is not connected to the first extension. It further includes a fourth extension portion extending toward the ground plate and a fifth extension portion extending toward the ground plate from an end of the third extension portion not connected to the second extension portion, the fourth extension portion and The fifth extension portion may have the same length.

As described above, the present invention has been described with specific details such as specific components and limited embodiments and drawings, but this is only provided to facilitate a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , those skilled in the art can make various modifications and variations from this description.

Accordingly, the spirit of the present invention should not be limited to the described embodiments, and the scope of the patent claims described below as well as all modifications that are equivalent or equivalent to the scope of this patent claim shall fall within the scope of the spirit of the present invention. .

Claims (11)

Board;
a ground plate formed on one side of the substrate;
a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other; and
It includes a stub disposed between the first antenna and the second antenna and connected to the ground plate,
The stub is,
A first extension part connected to the ground plate, a second extension part extending from the end of the first extension towards the first antenna, and a third extension part extending from the end of the first extension towards the second antenna. Contains,
An antenna module wherein the length of the second extension is different from the length of the third extension. According to paragraph 1,
The antenna module wherein the distance from the first antenna of the first extension is different from the distance from the second antenna of the first extension. According to paragraph 1,
The stub has a fourth extension portion extending toward the ground plate from an end not connected to the first extension portion of the second extension portion and a fourth extension portion extending toward the ground plate at an end not connected to the second extension portion of the third extension portion. It further includes a fifth extension extending toward,
An antenna module wherein the fourth extension part and the fifth extension part have the same length. According to paragraph 1,
The substrate is,
An antenna module including a first depression and a second depression, respectively, in areas where the first antenna and the second antenna are formed. According to paragraph 4,
The stub is an antenna module located in a protruding area between the first depression and the second depression. According to paragraph 1,
An antenna module in which the location of the first extension varies depending on the shape of the substrate. According to paragraph 1,
An antenna module in which the first antenna and the second antenna radiate signals in the same frequency band. According to paragraph 1,
An antenna module in which the stub is mounted in a pattern on the substrate. Board;
a ground plate formed on one side of the substrate;
a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other; and
It includes a stub disposed between the first antenna and the second antenna and connected to the ground plate,
The stub includes a first extension part connected to the ground plate, a second extension part extending from an end of the first extension towards the first antenna, and a second extension part extending from the end of the first extension towards the second antenna. It includes 3 extensions,
The shortest distance from the first antenna to the first extension is different from the shortest distance from the second antenna to the first extension,
The shortest distance from the first antenna to the second extension is the same as the shortest distance from the second antenna to the third extension. Board;
a ground plate formed on one side of the substrate;
a first antenna and a second antenna formed on one side of the substrate and spaced apart from each other; and
It includes a stub disposed between the first antenna and the second antenna and connected to the ground plate,
The stub includes a first extension part connected to the ground plate, a second extension part extending from an end of the first extension towards the first antenna, and a second extension part extending from the end of the first extension towards the second antenna. It includes 3 extensions,
The S21 parameter of the first antenna for the second antenna has a minimum value that is the minimum value in the bandwidth section of the first antenna or the second antenna. According to clause 10,
An antenna module wherein the bandwidth of the first antenna or the second antenna is 2.4 to 2.5 GHz.