KR20220128277A - Antenna Device Having Ultra Wide Band - Google Patents

Abstract

The present invention relates to an antenna device comprising: a first antenna module which is combined with a shield can grounded through a mainboard; a second antenna module which is separated from the first antenna module and is combined with the shield can; and a third antenna module which is separated from the first antenna module and the second antenna module, and is combined with an upper surface of the shield can. The first antenna module includes: a first power supply member which is electrically connected to the mainboard; a first radiator which is electrically connected to the first power supply member, and is arranged in an upper part of the shield can to be overlapped with the shield can based on a horizontal direction; a first dielectric layer which is arranged in lower parts of the first power supply member and the first radiator; a first ground pattern which is formed on a lower surface of the first dielectric layer to be overlapped with the first power supply member based on the horizontal direction; and a first insulating body which is combined with the lower surface of the first dielectric layer. The first insulating body is overlapped with the first radiator and the shield can based on the horizontal direction. Thickness of the first insulating body is thicker than thickness of the first dielectric layer. The present invention can improve manufacturing convenience.

Description

UWB Antenna Device {Antenna Device Having Ultra Wide Band}

The present invention relates to an antenna device, and more particularly, to a UWB antenna device.

Ultra Wide Band (UWB, hereinafter referred to as 'UWB') antenna device is a short-distance device such as Bluetooth that can transmit and receive data by wirelessly connecting to a PC, peripheral device, home appliance, etc. in a limited space such as an office or home. An antenna applied to wireless communication.

In general, a UWB antenna device is defined as a short-distance wireless communication device that realizes high-speed communication with low energy while having a very wide frequency band compared to the frequency band of a general antenna device at a speed of 100 Mbps or more in a band of 3.1 to 10.6 GHz. As described above, although the UWB antenna device has a relatively wide frequency band and transmits a signal having low energy, the UWB antenna device can output a data rate of several hundred Mbps to several Gbps within a radius of 10 m.

UWB antenna device transmits a signal by dispersing the energy of the signal over a frequency band of several GHz to prevent interference with other communication systems. can In addition, the UWB antenna device is very resistant to noise, has a high data rate, and has a small power consumption and low transmission output.

That is, the UWB antenna device shares a frequency without mutual interference with the existing narrowband and wideband antenna systems such as mobile communication and satellite communication in limited frequency resources, and can transmit signals with relatively low spectral power density over a wide frequency bandwidth. have.

Due to these advantages, the UWB antenna device is used in various electronic devices, and various characteristics are required depending on the application purpose. For example, in the case of a satellite communication antenna, radio wave transmission and reception are concentrated in a specific direction in which the satellite is located, whereas omnidirectional such as vehicle telematics, home terminal (indoor CPE), Internet of Things (IoT), etc. There are also many applications that require an omni-directional antenna that can transmit and receive radio waves.

Furthermore, as the frequency band used for wireless communication gradually increases in order to secure broadband characteristics, in 5G (5G) mobile communication, not only the S-band band (eg, 3.5 GHz band) but also the Ka-band band (eg, For example, as various high-frequency bands such as 28 GHz band are used, the development of high-performance omni-directional antennas suitable for the above high-frequency bands is required.

1 is a schematic side cross-sectional view of a UWB antenna device according to the prior art. The UWB antenna device 10 according to the prior art includes a radiator 11 , a power supply unit 12 , a ground 13 , a first dielectric layer 14 , a second dielectric layer 15 , and a connector 16 . The radiator 11 is electrically connected to the power feeding unit 12 . The power feeding unit 12 may be electrically connected to the main board 20 through the connector 16 . The connector 16 may be electrically connected to a counterpart connector (not shown) provided on the main board 20 to electrically connect the power supply unit 12 and the main board 20 . The ground 13 is used to ground various components of the connector 16 and to implement the characteristics of the antenna. The first dielectric layer 14 and the second dielectric layer 15 are used to realize antenna characteristics and secure the overall length by securing a minimum effective antenna length value for forming an antenna waveform. The first dielectric layer 14 and the second dielectric layer 15 form a stacked structure between the radiator 11 and the power feeder 12 and the ground 13 in the height direction (Z-axis direction). can be placed. Accordingly, the radiator 11 and the power feeder 12 are spaced upward from the ground 13 in the height direction (Z-axis direction) to realize antenna characteristics and the first dielectric layer 14 ) and a length corresponding to the sum of the thickness of the second dielectric layer 15 may increase the overall height of the antenna.

Here, the UWB antenna device 10 according to the prior art has the following problems.

First, the UWB antenna device 10 according to the prior art has a structure in which a plurality of dielectric layers are stacked, which increases the manufacturing cost compared to the case where it is composed of a single layer. In particular, since the dielectric layer is generally made of a flexible printed circuit board (FPCB), which has a high unit cost, the problem of increasing the manufacturing cost becomes more severe as the number of stacked dielectric layers increases.

Second, in the UWB antenna device 10 according to the prior art, different dielectric layers are alternately stacked to prevent moisture from occurring between the stacked dielectric layers. For example, in the UWB antenna device 10 according to the prior art, as shown in FIG. 1 , the first dielectric layer ( 14) and the second dielectric layer 15 having different physical properties is disposed. Accordingly, the UWB antenna device 10 according to the prior art has a problem in that not only the manufacturing cost increases compared to the case of being composed of a single type of dielectric layer, but also the antenna performance is deteriorated due to the difference in physical properties between the dielectric layers.

The present invention has been devised to solve the above-described problems, and it is to provide a UWB antenna device that can prevent an increase in manufacturing cost and deterioration of antenna performance due to a heterogeneous dielectric stack structure while having a non-directional characteristic. .

In order to solve the problems as described above, the present invention may include the following configuration.

A UWB antenna device according to the present invention includes: a first antenna module coupled to a shield can grounded through a main board; a second antenna module spaced apart from the first antenna module and coupled to the shield can; and a third antenna module spaced apart from the first antenna module and the second antenna module and coupled to the upper surface of the shield can. The first antenna module may include a first feeding member electrically connected to the main board; a first radiator electrically connected to the first feeding member and disposed on the shield can to overlap the shield can in a horizontal direction; a first dielectric layer disposed under the first feeding member and the first radiator; a first ground pattern formed on a lower surface of the first dielectric layer to overlap the first feeding member in the horizontal direction; and a first insulator coupled to a lower surface of the first dielectric layer. The length of the first ground pattern in the horizontal direction is shorter than the length of the first dielectric layer, and the first insulator is disposed to overlap both the first radiator and the shield can in the horizontal direction. can

According to the present invention, the following effects can be achieved.

The present invention is implemented so that the dielectric layer stacked structure can be replaced with an insulator having a relatively low cost by using a shield can that can serve as a ground for the radiator. Accordingly, the present invention can reduce manufacturing cost of the antenna structure and improve manufacturing convenience.

The present invention can fundamentally prevent deterioration of antenna performance due to a difference in physical properties between dielectric layers occurring in a dielectric stacked structure.

1 is a schematic cross-sectional view of a UWB antenna device according to the prior art;
2 and 12 are schematic plan views showing a state in which the UWB antenna device according to the present invention is installed on the main board.
3 is a schematic plan view of a UWB antenna device according to the present invention;
4 is a schematic side cross-sectional view of the first antenna module taken along line II of FIG. 3;
5 is a partial cross-sectional view of the first antenna module shown with reference to the line II of FIG. 3 in order to explain a modified embodiment of the UWB antenna device according to the present invention;
6 is a schematic plan view of a first radiator in the UWB antenna device according to the present invention;
7 is a conceptual plan view for explaining the direction of the current flowing on the first radiator in the UWB antenna device according to the present invention.
8 is a schematic side cross-sectional view of a second antenna module taken along line II of FIG. 3;
9 is a schematic side cross-sectional view of a third antenna module taken along line II-II of FIG. 3;
10 is a view showing a simulation result of a current distribution on a radiator in the UWB antenna device according to the present invention;
11 is a view showing a radiation pattern simulation result to explain the omni-directional antenna performance of the UWB antenna device according to the present invention;

Hereinafter, an embodiment of a UWB antenna device according to the present invention will be described in detail with reference to the accompanying drawings. Hatching in FIGS. 2 and 3 is indicated to distinguish between components. The arrows in FIG. 7 conceptually represent the flow of current.

2, 12 and 3, the UWB antenna device 1 according to the present invention is for transmitting and receiving signals. The UWB antenna device 1 according to the present invention may be installed in a mobile terminal, a home appliance requiring wireless communication, and a communication device for a vehicle. The UWB antenna device 1 according to the present invention can perform an antenna function by being electrically connected to the main board 2 coupled to the main body 4 provided inside the electronic device. The UWB antenna device 1 according to the present invention can secure a wide bandwidth by implementing Ultra Wide Band (UWB). In particular, the UWB antenna device 1 according to the present invention may be implemented as an omni-directional antenna device. To this end, the UWB antenna device 1 according to the present invention includes a first antenna module 100 , a second antenna module 200 , and a third antenna module 300 .

The first antenna module 100 , the second antenna module 200 , and the third antenna module 300 transmit and receive UWB signals in an ultra-wideband. In one embodiment, the first antenna module 100, the second antenna module 200, and the third antenna module 300 transmit and receive UWB signals in a band of 2.0 GHz to 10 GHz for ultra-wideband implementation. can The first antenna module 100 , the second antenna module 200 , and the third antenna module 300 may be disposed to be spaced apart from each other. Accordingly, the first antenna module 100 , the second antenna module 200 , and the third antenna module 300 may form radiation patterns for signal transmission and reception at different positions. 2 to 9 and 12 show that the UWB antenna device 1 according to the present invention includes only three antenna modules 100, 200, and 300, but is not necessarily limited thereto. The UWB antenna device 1 may be composed of four or more antenna modules. The embodiment in which the UWB antenna device 1 according to the present invention is composed of four or more antenna modules can be easily derived to those skilled in the art within the scope not in conflict with the contents described in this specification. There will be.

The first antenna module 100 , the second antenna module 200 , and the third antenna module 300 may be arranged to function as one antenna. The UWB antenna device 1 according to the present invention may be implemented as an omni-directional antenna device. For example, the UWB antenna device 1 according to the present invention tracks the location according to the triangulation method using the first antenna module 100 , the second antenna module 200 , and the third antenna module 300 . By tracking the location of the target device, the accuracy of location tracking may be improved.

Specifically, the UWB antenna device 1 according to the present invention provides an AOA (AOA) of UWB signals received through the first antenna module 100, the second antenna module 200, and the third antenna module 300. Angle of Arrival) can be used to determine the three-dimensional direction of the target device, and based on this, the location of the target device can be accurately tracked. In this case, the AOA technique calculates the angle of the UWB signal arriving from the target device, and the UWB detected by the first antenna module 100 , the second antenna module 200 , and the third antenna module 300 . The three-dimensional direction of the target device is determined using the time interval and the arrival angle of the signal. Since a technique for determining a three-dimensional direction of a corresponding device using the AOA technique is a known technique, a detailed description thereof will be omitted.

2, 3, and 12, the first antenna module 100, the second antenna module 200, and the third antenna module 300 are spaced apart from each other at positions spaced apart from each other on the main board ( 2) can be electrically connected to. For example, the first antenna module 100 is coupled to a grounded shield can 3 through the main board 2 , and the second antenna module 200 is the first antenna module 100 . spaced apart from and coupled to the shield can 3 , and the third antenna module 300 is spaced apart from the first antenna module 100 and the second antenna module 200 and coupled to the shield can 3 . can be

The shield can 3 is for protecting the main board 2 . The shield can 3 may be grounded through the main board 2 . The shield can 3 may be formed of a material having an electrical conductivity. For example, the shield can 3 may be formed of a metal such as copper (Cu).

The shield can 3 may include a shield body 31 and a shield groove 32 . The shield body 31 may be disposed on the upper side of the main board 2 to cover at least a part of the main board 2 . The shield body 31 may be formed as a thin plate of a rectangular shape as a whole, but is not limited thereto, and may be formed in another shape as long as it can cover at least a part of the main board 2 . The shield groove 32 is formed in the shield body 31 . The shield groove 32 may be formed through the shield body 31 . The main board 2 may be exposed to the outside through the shield groove 32 . The first antenna module 100 , the second antenna module 200 , and the third antenna module 300 are coupled to the upper surface of the shield body 31 through the shield groove 32 . It may be electrically connected to the main board 2 inside the shield body 31 .

Hereinafter, each of the first antenna module 100 , the second antenna module 200 , and the third antenna module 300 will be described in detail with reference to FIGS. 2 to 12 .

2 to 4 and 12 , the first antenna module 100 is coupled to the shield can 3 . The first antenna module 100 may include a first power supply member 111 , a first radiator 120 , a first dielectric layer 130 , a first ground pattern 112 , and a first insulator 140 . have.

The first feeding member 111 is electrically connected to the main board 2 . The first power feeding member 111 may be coupled to the upper surface of the first dielectric layer 130 . The first feeding member 111 may be disposed parallel to the first dielectric layer 130 . The first feeding member 111 is electrically connected to the first connector 113 coupled to the lower surface of the first dielectric layer 130 through a first via (not shown) formed in the first dielectric layer 130 . can be connected As the first connector 113 is connected to a counterpart connector provided on the main board 2 , the first power feeding member 111 may be electrically connected to the main board 2 . The first feeding member 111 may be formed of a material having an electrical conductivity. For example, the first power feeding member 111 may be formed of a metal such as copper (Cu).

The first radiator 120 is for implementing an antenna function. The first radiator 120 may be electrically connected to the first power feeding member 111 . The first radiator 120 may be electrically connected by being directly coupled to the first feeding member 111 , and one side is coupled to the first radiator 120 , and the other side is coupled to the first feeding member 111 . It may be electrically connected to the first feeding member 111 through a coupled extension member (not shown). The first radiator 120 may be electrically connected to the main board 2 through the first power feeding member 111 .

The first radiator 120 may be disposed above the shield can 3 so as to overlap the shield can 3 in a horizontal direction. The horizontal direction means a direction perpendicular to the height direction (Z-axis direction) from the first radiator 120 toward the shield can 3 . The height direction (Z-axis direction) may be a direction in which the first power feeding member 111 is stacked on the first dielectric layer 130 . Accordingly, the shield can 3 grounded through the main board 2 may be disposed under the first radiator 120 . The first radiator 120 may be formed in a rectangular shape as a whole, but is not limited thereto, and may be formed in another shape as long as an antenna function can be implemented. For example, the first radiator 120 may be formed in a circular shape as a whole. The first radiator 120 may be formed of a material having an electrical conductivity. For example, the first radiator 120 may be formed of a metal such as copper (Cu).

The first dielectric layer 130 is disposed under the first power feeding member 111 and the first radiator 120 . An upper surface of the first dielectric layer 130 may be coupled to the first power feeding member 111 and the first radiator 120 . The first dielectric layer 130 may be disposed in parallel with respect to both the first power feeding member 111 and the first radiator 120 with respect to the horizontal direction. The first dielectric layer 130 may be a flexible printed circuit board (FPCB).

The first ground pattern 112 is formed on the lower surface of the first dielectric layer 130 . The first ground pattern 112 may perform a grounding function for various components of the first connector 113 coupled to the lower surface of the first dielectric layer 130 . The first ground pattern 112 may be disposed to overlap the first feeding member 111 in the horizontal direction. Based on the horizontal direction, the length of the first ground pattern 112 may be shorter than the length of the first dielectric layer 130 . The first feeding member 111 , the first ground pattern 112 , and the first connector 113 may form a first feeding unit 110 for applying a current to the first radiator 120 . can The first feeding unit 110 may be electrically connected to the main board 2 through the shield groove 32 of the shield can 3 .

The first insulator 140 is coupled to the lower surface of the first dielectric layer 130 . The first dielectric layer 130 may be disposed to overlap both the first radiator 120 and the shield can 3 in the horizontal direction. The first insulator 140 may be formed of an insulating material. For example, the first insulator 140 may be formed of plastic, rubber, or the like.

Accordingly, the UWB antenna device 1 according to the present invention can achieve the following effects.

First, in the UWB antenna device 1 according to the present invention, the shield can 3 disposed under the first radiator 120 replaces the role of the first ground pattern 112 , so that the first radiator Even if the first ground pattern 112 is not disposed under the 120 , it is possible to prevent the loss of the existing antenna characteristics. Accordingly, in the UWB antenna device 1 according to the present invention, instead of additionally stacking high-cost dielectric layers to form a ground pattern spaced apart from the first radiator 120 by a predetermined distance, the unit cost is significantly lower than that of the dielectric layer. It is implemented so that only the separation distance between the first radiator 120 and the shield can 3 can be secured by using an insulator. Therefore, the UWB antenna device 1 according to the present invention can reduce the manufacturing cost.

Second, the UWB antenna device 1 according to the present invention can realize the miniaturization of the first feeding unit 110 based on the height direction (Z-axis direction). In the case of the comparative example in which a plurality of dielectric layers are stacked in order to increase the separation distance between the first radiator 120 and the shield can 3 , as the plurality of dielectric layers are stacked, the first feeding unit 110 also has the height Since it is enlarged with respect to the direction (Z-axis direction), installation of the antenna mounting area is limited in small electronic devices, etc. may be restricted. On the other hand, in the UWB antenna device 1 according to the present invention, the first radiator 120 and the shield can 3 are used without affecting the height of the first feeding unit 110 by using the first insulating member. It is implemented to increase only the separation distance between them. Accordingly, the UWB antenna device 1 according to the present invention can realize miniaturization of the first feeding unit 110 corresponding to the antenna mounting area based on the height direction (Z-axis direction).

Third, since the UWB antenna device 1 according to the present invention is implemented to replace the first ground pattern 112 by using the shield can 3, which is an accompanying structure, manufacturing convenience is achieved by simplifying the structure of the antenna device. can be improved and manufacturing costs can be reduced.

Fourth, since the UWB antenna device 1 according to the present invention is implemented with a single dielectric layer, it is possible to fundamentally prevent deterioration of antenna performance due to a difference in physical properties between dielectric layers that may occur in a stacked structure of different dielectric layers. Therefore, the UWB antenna device 1 according to the present invention can secure more stable antenna performance while reducing manufacturing cost through a single dielectric layer.

Referring to FIG. 4 , the first ground pattern 112 and the first insulator 140 may be disposed to overlap the first radiator 120 . The first ground pattern 112 and the first insulator 140 may be disposed to be spaced apart from each other in the horizontal direction. The first spacing groove 150 may be disposed between the first ground pattern 112 and the first insulator 140 . Based on the horizontal direction, the first ground pattern 112 , the first spacing groove 150 , and the first insulator 140 may be disposed to overlap the first radiator 120 . Accordingly, the UWB antenna device 1 according to the present invention increases the separation distance between the first ground pattern 112 and the first radiator 120 by using the first spacing groove 150, It is possible to reduce the interference with the antenna performance of the first radiator 120 by the first ground pattern 112 .

A thickness of the first insulator 140 may be greater than a thickness of the first dielectric layer 130 . In this specification, "thickness" means a length based on the height direction (Z-axis direction). For example, as shown in FIG. 4 , the thickness H of the first insulator 140 may be greater than the thickness h of the first dielectric layer 130 . Accordingly, the UWB antenna device 1 according to the present invention can reduce the number of stacking stages compared to the same height as compared to the comparative example in which the thickness of the first insulator 140 is equal to or less than the thickness of the first dielectric layer 130 . Therefore, in the UWB antenna device 1 according to the present invention, compared to the comparative example, the number of work required for lamination can be reduced, and the stability of the lamination structure is deteriorated due to moisture penetration between the laminated components or external impact. degree can be reduced.

Referring to FIG. 5 , the first insulator 140 may include a plurality of first insulator units 140a and 140b. The first insulator units 140a and 140b may be stacked based on the height direction (Z-axis direction). For example, the 1-1 insulator unit 140b may be coupled to the upper surface of the 1-2 insulator unit 141b to be disposed on the 1-2 insulator unit 140a. The first insulator units 140a and 140b may be formed to have different thicknesses. For example, the thickness H1 of the first-first insulator unit 140b may be smaller than the thickness H2 of the first-second insulator unit 140a. In this case, the thickness H of the first insulator 140 may be the sum of the thickness H1 of the 1-2 insulator unit 140b and the thickness H2 of the 1-2 insulator unit 140a. have. Accordingly, the UWB antenna device 1 according to the present invention can implement various thicknesses of the first insulator 140 by changing the configuration of the first insulator units 140a and 140b, so that the thickness of the first insulator 140 can be varied. Versatility can be improved. Meanwhile, the first insulator units 140a and 140b may be formed to have the same thickness. In FIG. 5 , the first insulator 140 is illustrated as including only two first insulator units 140a and 140b, but the present invention is not limited thereto, and the first insulator 140 includes three or more first insulator units. may include

2, 3, 6, 7, and 12, the first radiator 120 includes a first radiation body 121, a first square slot 122, and a first ring slot 123. ) may be included.

The first radiation body 121 forms the overall appearance of the first radiator 120 . The first radiation body 121 may be coupled to the upper surface of the first dielectric. The first radiation body 121 may be connected to the first feeding member 111 . The first radiation body 121 may be directly coupled to the first feeding member 111, and the first radiation body 121 may be connected to the first feeding member 111 through the first connection member. may be

The first radiation body 121 may be formed as a thin plate in a rectangular shape as a whole, but is not limited thereto, and the first radiation body 121 may be formed in various shapes depending on the antenna performance to be implemented. . For example, the first radiation body 121 may be formed in a circular shape. The first radiation body 121 may be formed of a material having an electrical conductivity. For example, the first radiation body 121 may be formed of a metal such as copper (Cu).

The first rectangular slot 122 is formed in the first radiation body 121 . The first rectangular slot 122 may be formed through the first radiation body 121 . The first rectangular slot 122 may be formed to extend from the end of the first radiation body 121 toward the inside of the first radiation body 121 . For example, as shown in FIG. 6 , the first rectangular slot 122 is the first radiation body 121 in the vertical direction (Y-axis direction) perpendicular to the horizontal direction (X-axis direction) of the first radiator 120 . ) may be formed extending from one end to the inside of the first radiation body 121 . The horizontal direction (X-axis direction) and the vertical direction (Y-axis direction) are directions parallel to the horizontal direction, respectively. The first rectangular slot 122 may be formed in a rectangular shape as a whole. For example, the first rectangular slot 122 may be formed in a rectangular shape. The longitudinal direction of the first rectangular slot 122 may refer to a direction in which the first rectangular slot 122 extends from the end of the first radiation body 121 toward the inside of the first radiation body 121 . have. For example, the longitudinal direction of the first rectangular slot 122 may be the vertical direction (Y-axis direction) with reference to FIG. 6 .

The first ring slot 123 is spaced apart from the first rectangular slot 122 . The first ring slot 123 may be formed through the first radiation body 121 . The first side slot 1231 , the first other side slot 1232 , and the first connection slot 1233 may be integrally formed. Accordingly, the first ring slot 123 may be formed in an at least partially open ring shape as a whole.

The first ring slot 123 may include a first side slot 1231 , a first other side slot 1232 , and a first connection slot 1233 . The first one-side slot 1231 is spaced apart from one side of the first rectangular slot 122 . One side of the first rectangular slot 122 may mean one side with respect to the first axial direction (X-axis direction). The first other side slot 1232 is spaced apart from the other side of the first rectangular slot 122 . The other side of the first rectangular slot 122 may mean the other side with respect to the horizontal direction (X-axis direction). The first connection slot 1233 is connected to the first one side slot 1231 and the first other side slot 1232 . One side of the first connection slot 1233 may be connected to the first side slot 1231 , and the other side of the first connection slot 1233 may be connected to the first other side slot 1232 . The first connection slot 1233 may be disposed to surround at least a portion of the first rectangular slot 122 . Accordingly, at least a portion of the first connection slot 1233 may be disposed inside the first ring slot 123 , and the remaining portion may be disposed outside the first ring slot 123 . In this case, in the first radiation body 121, the portion surrounded by the first ring slot 123 is defined as the first inner body 1212, and the portion surrounding the first ring slot 123 is the second 1 may be defined as an external body 1211 .

Accordingly, the UWB antenna device 1 according to the present invention can increase the frequency band by using the first square slot 122 and the first ring slot 123 . Looking at this in detail, it is as follows. First, looking at the direction in which the current supplied from the first feeding unit 110 moves on the first radiation body 121 with reference to FIG. 7 , the first feeding member The current applied from (111) flows into the first radiation body (121). The current flowing into the first radiation body 121 may form a UWB main resonance frequency of 7 GHz band by increasing the density along the outer shell of the first rectangular slot 122 .

The current flows through the first side passage 1213 or the first other side slot 1232 and the first rectangular slot 122 disposed between the first side slot 1231 and the first rectangular slot 122 . It may flow to the first inner body 1212 through the first other side passage 1214 disposed between the.

Here, in the UWB antenna device 1 according to the present invention, the periphery of the first inner body 1212 is implemented to form a curved surface through the first ring slot 123, so that the first inner body 1212 has a limited area. This is implemented to secure various current paths. The current path is the length of the path through which the currents flowing into the first internal body 1212 through the first slot 1213 or the first other slot 1232 flow on the first internal body 1212. it means. In the UWB antenna device 1 according to the present invention, since the first internal body 1212 has a circular or oval shape as a whole by the first ring slot 123, the current path can be implemented in various ways. Accordingly, the UWB antenna device 1 according to the present invention can realize a wide bandwidth by widening the bandwidth by combining the subdivided resonant frequencies through various current paths formed by the first ring slot 123 .

For example, in the UWB antenna device according to the present invention, the main resonance frequency ( It can implement up to 8.4GHz, which is a higher frequency than 7.0Ghz). Accordingly, the UWB antenna device 1 according to the present invention realizes a wider bandwidth under the limited area of the first radiator 120, so that the usability for a system requiring a wide bandwidth while being high frequency such as UWB can be further improved. have. This effect can be seen from the results of the current density analysis performed in the embodiment including the first square slot 122 and the first ring slot 123 . Looking at this in detail, it is as follows.

First, FIG. 10 shows the density distribution with respect to the current density on the first radiator 120 . In FIG. 10 , a color closer to red indicates a higher current density, and a color closer to blue indicates a lower current density.

Next, as shown in <A> of FIG. 10 , the current density increases along the outer edge of the first rectangular slot 122 , thereby realizing a frequency of 7.0 GHz band.

Next, as shown in <B> of FIG. 10 , when the current density increases along the outer shell of the first ring slot 123 , it can be confirmed that the frequency of the 7.7 GHz band is realized. In this case, it can be seen that the current density is relatively higher at both ends of the first ring slot 123 than at the circumference of the first ring slot 123 .

Next, as shown in <C> of FIG. 10 , when the current density further increases along the outer shell of the first ring slot 123 , it can be confirmed that the frequency of the 8.4 GHz band is realized. Even in this case, it can be seen that the current density is relatively higher at both ends of the first ring slot 123 than at the circumference of the first ring slot 123 .

As described above, in the UWB antenna device according to the present invention, the main resonance frequency implemented by the first square slot 122 through the currents flowing on the first inner body 1212 through the first ring slot 123 . Broadband can be realized by widening the bandwidth by implementing a higher frequency. Therefore, the UWB antenna device 1 according to the present invention can implement a higher quality omni-directional antenna.

On the other hand, the effect that the UWB antenna device according to the present invention can realize a wide band by showing the above-described distribution of current density can be confirmed from the analysis result of the radiation pattern shown in FIG. 11 . 11 shows a simulation result (A) of a radiation pattern according to the prior art and a simulation result (B) of a radiation pattern of the UWB antenna device 1 according to the present invention. In FIG. 11 , a color closer to red has a higher dB, and a color closer to blue has a lower dB. 11, the radiation pattern simulation result (B) of the UWB antenna device 1 according to the present invention has a higher Peak Gain value compared to the radiation pattern simulation result (A) according to the prior art, It can be confirmed that a more extensive and evenly formed radiation pattern is implemented.

6 and 7 , a separation distance between one side of the first rectangular slot 122 and the first side slot 1231 may be shorter than a width length of the first rectangular slot 122 . For example, a separation distance between one side of the first rectangular slot 122 and the first one side slot 1231 in the horizontal direction (X-axis direction) is the first square based on the horizontal direction (X-axis direction). It may be shorter than the width of the slot 122 . Accordingly, the UWB antenna device 1 according to the present invention further reduces the size of the first one-side passage 1213, so that the current between one side of the first square slot 122 and the first one-side slot 1231 is The density can be further increased. Therefore, the UWB antenna device 1 according to the present invention implements a wider band under the limited area of the first radiator 120, so that it is possible to further improve the usability of a system requiring a wide bandwidth while being high frequency, such as UWB. .

A distance between the other side of the first rectangular slot 122 and the first other side slot 1232 may be shorter than a width length of the first rectangular slot 122 . For example, as shown in FIG. 6 , the separation distance between the other side of the first rectangular slot 122 and the first other side slot 1232 in the horizontal direction (X-axis direction) is based on the horizontal direction (X-axis direction). It may be shorter than the width of the first rectangular slot 122 . Accordingly, in the UWB antenna device 1 according to the present invention, the current between the other side of the first rectangular slot 122 and the first other side slot 1232 by further reducing the size of the first other side passage 1214 . The density can be further increased. Therefore, the UWB antenna device 1 according to the present invention implements a wider band under the limited area of the first radiator 120, so that it is possible to further improve the usability of a system requiring a wide bandwidth while being high frequency, such as UWB. .

6 and 7 , the first side slot 1231 may be formed to have a reduced width as it extends from the first connection slot 1233 toward one side of the first rectangular slot 122 . For example, the first one side slot 1231 may be sharply formed to taper toward the first rectangular slot 122 . Accordingly, in the UWB antenna device according to the present invention, the length of the wavelength according to the frequency as compared to the comparative example in which the width of the first one side slot 1231 is not reduced as it extends toward one side of the first rectangular slot 122 By subdividing , impedance matching of the frequency band to be used is realized, and the radiation characteristics and bandwidth can be further improved by implementing a wider bandwidth.

The first other side slot 1232 may be formed to have a reduced width as it extends from the first connection slot 1233 toward the other side of the first rectangular slot 122 .

For example, the first other side slot 1232 may be sharply formed to taper toward the first rectangular slot 122 . Accordingly, in the UWB antenna device according to the present invention, the length of the wavelength according to the frequency as compared to the comparative example in which the width of the first other side slot 1232 is not reduced as it extends toward the other side of the first rectangular slot 122 By subdividing , impedance matching of the frequency band to be used is realized, and the radiation characteristics and bandwidth can be further improved by implementing a wider bandwidth.

This effect is that in <B> and <C> of FIG. 10, the current density increases as the current density increases from the first slot 1231 and the first other slot 1232 toward the first square slot 122. can be checked through

The first ring slot 123 may be formed in a symmetrical shape with respect to the first rectangular slot 122 . Specifically, the first ring slot 123 is a symmetric line parallel to the vertical direction (Y-axis direction) while passing through the center point of the first rectangular slot 122 with respect to the horizontal direction (X-axis direction) ( It may be formed symmetrically with respect to (not shown). Accordingly, the UWB antenna device 1 according to the present invention can further improve the radiation characteristics and bandwidth of the frequency by securing a symmetrical current path on the first inner body 1212 of the current.

An inner surface of the first one side slot 1231 , an inner surface of the first connection slot 1233 , and an inner surface of the first other side slot 1232 may be connected to each other to form a single curved surface. An inner surface of the first one-side slot 1231 is a surface facing the first inner body 1212 from the first one-side slot 1231 , and an inner surface of the first connection slot 1233 is the first connection A surface facing the first inner body 1212 in the slot 1233, and the inner surface of the first other slot 1232 is a surface facing the first inner body 1212 in the first other slot 1232 means Accordingly, the UWB antenna device 1 according to the present invention may be implemented such that the circumferential surface of the first inner body 1212 forms a continuous curved surface. Therefore, in the UWB antenna device 1 according to the present invention, the current moves to the circumferential surface of the first inner body 1212 based on the first one side passage 1213 or the first other side passage 1214. By implementing the length of the current path to change continuously, it is possible to realize a more detailed profile with respect to the frequency. In the case of a comparative example in which the circumferential surface of the first inner body 1212 is a polygon, it may not be possible to generate a specific frequency because the current path changes non-continuously, whereas the UWB antenna device 1 according to the present invention has the This is because, as the circumferential surface of the first inner body 1212 is formed as a continuous curved surface, the current path changes continuously, so that more diverse frequencies can be configured even in the same frequency band as the comparative example.

2, 3, 8, and 12 , the second antenna module 200 is coupled to the shield can 3 . The second antenna module 200 may include a second power supply member 211 , a second radiator 220 , a second dielectric layer 230 , a second ground pattern 212 , and a second insulator 240 . have. The second feeding member 211 is electrically connected to the main board 2 . The second radiator 220 is electrically connected to the second feeding member 211 and is disposed on the shield can 3 so as to overlap the shield can 3 in a horizontal direction. The second dielectric layer 230 is disposed under the second power feeding member 211 and the second radiator 220 . The second ground pattern 212 is formed on the lower surface of the second dielectric layer 230 to overlap the second power feeding member 211 in the horizontal direction. The second insulator 240 is coupled to the lower surface of the second dielectric layer 230 . In the horizontal direction, the length of the second ground pattern 212 is shorter than the length of the second dielectric layer 230, and the second insulator 240 is the second radiator ( 220) and the shield can 3 may be disposed to overlap with each other.

Accordingly, the UWB antenna device 1 according to the present invention can achieve the following effects.

First, in the UWB antenna device 1 according to the present invention, the shield can 3 disposed under the second radiator 220 replaces the role of the second ground pattern 212 , so that the second radiator Even if the second ground pattern 212 is not disposed under the 220 , it is possible to prevent the loss of the existing antenna characteristics. Accordingly, in the UWB antenna device 1 according to the present invention, instead of additionally stacking expensive dielectric layers to form a ground pattern spaced a predetermined distance from the second radiator 220, the unit cost is significantly lower than that of the dielectric layer. Since it is only necessary to secure a separation distance between the second radiator 220 and the shield can 3 using an insulator, manufacturing cost can be reduced.

Second, the UWB antenna device 1 according to the present invention is connected to the second feeding member 211, the second ground pattern 212, and the second connector 213 based on the height direction (Z-axis direction). It is possible to implement the miniaturization of the second feeding unit 210 made. In the case of the comparative example in which a plurality of dielectric layers are stacked to increase the separation distance between the second emitter 220 and the shield can 3, as the plurality of dielectric layers are stacked, the second feeder 210 also has the height. Since it is enlarged with respect to the direction (Z-axis direction), installation of the antenna mounting area is limited in small electronic devices, etc. may be restricted. On the other hand, in the UWB antenna device 1 according to the present invention, the second radiator 220 and the shield can 3 are used without affecting the height of the second feeding part 210 by using the second insulating member. It is implemented to increase only the separation distance between them. Accordingly, the UWB antenna device 1 according to the present invention can realize miniaturization of the second feeding unit 210 corresponding to the antenna mounting area based on the height direction (Z-axis direction).

Third, since the UWB antenna device 1 according to the present invention is implemented to replace the second ground pattern 212 by using the shield can 3, which is a structure accompanying the existing structure, manufacturing convenience by simplifying the structure of the antenna device can be improved and manufacturing costs can be reduced.

Fourth, since the UWB antenna device 1 according to the present invention is implemented with a single dielectric layer, it is possible to fundamentally prevent deterioration of antenna performance due to a difference in physical properties between dielectric layers that may occur in a stacked structure of different dielectric layers. Therefore, the UWB antenna device 1 according to the present invention can secure more stable antenna performance while reducing manufacturing cost through a single dielectric layer.

The second ground pattern 212 and the second insulator 240 may be disposed to overlap the second radiator 220 . The second antenna module 200 may further include a second spacing groove 250 . The second feeding member 211 , the second radiator 220 , the second dielectric layer 230 , the second ground pattern 212 , the second insulator 240 , and the second spacing groove 250 ) is the first feeding member 111, the first radiator 120, the first dielectric layer 130, the first ground pattern 112, the first insulator 140, and the first spacing groove ( 150), so a detailed description thereof will be omitted. In addition, since the second antenna module 200 approximately coincides with the first antenna module 100 , the structure and characteristics of the first antenna module 100 do not conflict with the second antenna module 200 . It will be apparent to those skilled in the art that it can be applied to the second antenna module 200 within the scope of the present invention.

2, 3, 9, and 12 , the third antenna module 300 is coupled to the shield can 3 . The third antenna module 300 may include a third power supply member 311 , a third radiator 320 , a third dielectric layer 330 , a third ground pattern 312 , and a third insulator 340 . have. The third feeding member 311 is electrically connected to the main board 2 . The third radiator 320 is electrically connected to the third power feeding member 311 and is disposed on the upper portion of the shield can 3 so as to overlap the shield can 3 in a horizontal direction. The third dielectric layer 330 is disposed under the third power feeding member 311 and the third radiator 320 . The third ground pattern 312 is formed on the lower surface of the third dielectric layer 330 to overlap the third power feeding member 311 in the horizontal direction. The third insulator 340 is coupled to the lower surface of the third dielectric layer 330 . The length of the third ground pattern 312 in the horizontal direction is shorter than the length of the third dielectric layer 330, and the third insulator 340 is the third radiator ( 320 and the shield can 3 may be disposed to overlap with each other.

Accordingly, the UWB antenna device 1 according to the present invention can achieve the following effects.

First, in the UWB antenna device 1 according to the present invention, the shield can 3 disposed under the third radiator 320 replaces the role of the third ground pattern 312 , so that the third radiator Even if the third ground pattern 312 is not disposed under the 320 , it is possible to prevent loss of the existing antenna characteristics. Accordingly, in the UWB antenna device 1 according to the present invention, instead of additionally stacking expensive dielectric layers to form a ground pattern spaced a predetermined distance from the third radiator 320, the unit cost is significantly lower than that of the dielectric layer. Since it is only necessary to secure a separation distance between the third radiator 320 and the shield can 3 using an insulator, manufacturing cost can be reduced.

Second, the UWB antenna device 1 according to the present invention is connected to the third feeding member 311, the third ground pattern 312, and the third connector 313 based on the height direction (Z-axis direction). It is possible to implement the miniaturization of the third power feeding unit 310 made. In the case of the comparative example in which a plurality of dielectric layers are stacked to increase the separation distance between the third emitter 320 and the shield can 3, as the plurality of dielectric layers are stacked, the third power supply unit 310 also has the height Since it is enlarged with respect to the direction (Z-axis direction), installation of the antenna mounting area is limited in small electronic devices, etc. may be restricted. On the other hand, in the UWB antenna device 1 according to the present invention, the third radiator 320 and the shield can 3 are used without affecting the height of the third feeding part 310 by using the third insulating member. It is implemented to increase only the separation distance between them. Therefore, the UWB antenna device 1 according to the present invention can realize the miniaturization of the third feeding unit 310 corresponding to the antenna mounting area based on the height direction (Z-axis direction).

Third, since the UWB antenna device 1 according to the present invention is implemented to replace the third ground pattern 312 by using the shield can 3, which is an accompanying structure, manufacturing convenience is achieved by simplifying the structure of the antenna device. can be improved and manufacturing costs can be reduced.

Fourth, since the UWB antenna device 1 according to the present invention is implemented with a single dielectric layer, it is possible to fundamentally prevent deterioration of antenna performance due to a difference in physical properties between dielectric layers that may occur in a stacked structure of different dielectric layers. Therefore, the UWB antenna device 1 according to the present invention can secure more stable antenna performance while reducing manufacturing cost through a single dielectric layer.

The third ground pattern 312 and the third insulator 340 may be disposed to overlap the third radiator 320 . The third antenna module 300 may further include a third spacing groove 350 . The third feeding member 311 , the third radiator 320 , the third dielectric layer 330 , the third ground pattern 312 , the third insulator 340 , and the third spacing groove 350 ) is the first feeding member 111, the first radiator 120, the first dielectric layer 130, the first ground pattern 112, the first insulator 140, and the first spacing groove ( 150), so a detailed description thereof will be omitted.

In addition, since the third antenna module 300 approximately coincides with the first antenna module 100 , the structure and characteristics of the first antenna module 100 do not conflict with the third antenna module 300 . It will be apparent to those skilled in the art that it can be applied to the third antenna module 300 within the scope of the present invention.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention pertains that various substitutions, modifications, and changes are possible without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of

1: antenna device 100: first antenna module
110: first feeding unit 111: first feeding member
112: first ground pattern 113: first connector
120: first radiator 121: first radiation body
122: first square slot 123: first ring slot
130: first dielectric layer 140: first insulator
150: first separation groove 200: second antenna module
210: second feeder 220: second emitter
230: second dielectric layer 300: third antenna module
310: 3rd feeder 320: 3rd emitter

Claims (14)

a first antenna module coupled to a shield can grounded through the main board;
a second antenna module spaced apart from the first antenna module and coupled to the shield can; and
and a third antenna module spaced apart from the first antenna module and the second antenna module and coupled to the upper surface of the shield can,
The first antenna module,
a first feeding member electrically connected to the main board;
a first radiator electrically connected to the first feeding member and disposed on the shield can to overlap the shield can in a horizontal direction;
a first dielectric layer disposed under the first feeding member and the first radiator;
a first ground pattern formed on a lower surface of the first dielectric layer to overlap the first feeding member in the horizontal direction; and
a first insulator coupled to a lower surface of the first dielectric layer;
The first insulator is disposed to overlap both the first emitter and the shield can in the horizontal direction,
The thickness of the first insulator is thicker than the thickness of the first dielectric layer UWB antenna device, characterized in that. According to claim 1,
The first ground pattern and the first insulator are arranged spaced apart from each other in the horizontal direction. 3. The method of claim 2,
The first ground pattern and the first insulator are disposed to overlap the first radiator with respect to the horizontal direction. According to claim 1,
A UWB antenna device, characterized in that the length of the first ground pattern is shorter than the length of the first dielectric layer based on the horizontal direction. According to claim 1,
The first insulator includes a plurality of first insulator units,
The UWB antenna device, characterized in that the first insulator units are formed to have different thicknesses. According to claim 1,
The first radiator includes a first rectangular slot, and a first ring slot spaced apart from the first rectangular slot,
The first ring slot is a first side slot spaced apart from one side of the first rectangular slot, a first other side slot spaced apart from the other side of the first rectangular slot, and the first side slot is connected to the first other side slot and a first connection slot disposed to surround at least a portion of the first rectangular slot. 7. The method of claim 6,
The UWB antenna device, characterized in that the separation distance between one side of the first rectangular slot and the first side slot is shorter than a width length of the first rectangular slot. 7. The method of claim 6,
The UWB antenna device, characterized in that the separation distance between the other side of the first rectangular slot and the first other side slot is shorter than the width length of the first rectangular slot. 7. The method of claim 6,
The UWB antenna device, characterized in that the width of the first slot is formed to decrease as it extends from the first connection slot toward one side of the first rectangular slot. 7. The method of claim 6,
The first other side slot is UWB antenna device, characterized in that the width is formed to decrease as it extends from the first connection slot toward the other side of the first rectangular slot. 7. The method of claim 6,
The first ring slot is UWB antenna device, characterized in that formed in a symmetrical shape with respect to the first rectangular slot. 7. The method of claim 6,
The inner surface of the first one side slot, the inner surface of the first connection slot, and the inner surface of the first other side slot are connected to each other to form a single curved surface,
An outer surface of the first slot, an outer surface of the first connection slot, and an outer surface of the first other slot are connected to each other to form a single curved surface. According to claim 1,
The second antenna module,
a second feeding member electrically connected to the main board;
a second radiator electrically connected to the second feeding member and disposed on the shield can to overlap the shield can in a horizontal direction;
a second dielectric layer disposed under the second feeding member and the second radiator;
a second ground pattern formed on a lower surface of the second dielectric layer to overlap the second feeding member in the horizontal direction; and
a second insulator coupled to a lower surface of the second dielectric layer;
A length of the second ground pattern based on the horizontal direction is shorter than a length of the second dielectric layer,
The second insulator is disposed to overlap both the second radiator and the shield can with respect to the horizontal direction. 12. The method of claim 11,
a third feeding member electrically connected to the main board;
a third emitter electrically connected to the third feeding member and disposed on the shield can to overlap the shield can in a horizontal direction;
a third dielectric layer disposed under the third power feeding member and the third radiator;
a third ground pattern formed on a lower surface of the third dielectric layer to overlap the third power feeding member in the horizontal direction; and
a third insulator coupled to the lower surface of the third dielectric layer;
A length of the third ground pattern based on the horizontal direction is shorter than a length of the third dielectric layer,
The third insulator is arranged to overlap both the third radiator and the shield can with respect to the horizontal direction.

Images