Vehicle-mounted built-in antenna

Abstract

To provide a built-in antenna for a vehicle which can be manufactured with low manufacturing complexity and low manufacturing cost and has a high radiation gain in all directions. [Solution] A built-in antenna for a vehicle according to the present invention includes a substrate having a power supply portion formed on an upper portion and a ground surface formed on a lower portion; a first radiating plate electrically connected to the power supply portion and extending from the substrate at an angle in a first direction; a second radiating plate spaced apart from the first radiating plate, electrically connected to the power supply portion and extending from the substrate at an angle in a second direction opposite to the first direction; and a third radiating plate electrically connected to the ground surface, spaced apart from the first and second radiating plates, and positioned so as to be electromagnetically coupled to the first and second radiating plates, wherein the widths of the first and second radiating plates gradually increase as they move away from the substrate.

Description

Technical Field

[0001] The present invention relates to an antenna, and more particularly to a built-in antenna for a vehicle.

Background Art

[0002] With the development of communication technologies, various communications are also being carried out through vehicles. As an antenna for vehicle communication, a shark fin antenna disposed outside the vehicle is used. The shark fin antenna is coupled to a vehicle roof and communicates with an external device. However, since the shark fin antenna protrudes from the vehicle roof, there is a problem of impairing the aesthetics of the vehicle. Thus, recently, the demand for a built-in antenna that is embedded inside the vehicle roof has been increasing.

[0003] However, a built-in antenna for a vehicle requires a higher radiation gain compared to a shark fin antenna, and there is a problem that a higher design difficulty and a higher manufacturing cost are required compared to a shark fin antenna. As a radiator of a conventional built-in antenna for a vehicle, a conical radiator is mainly used. However, since this conical radiator is difficult to manufacture, it has acted as a major factor in increasing the manufacturing cost and manufacturing difficulty of a built-in antenna for a vehicle.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a built-in antenna for a vehicle that can be manufactured with low manufacturing complexity and low manufacturing cost and has a high radiation gain.

Means for Solving the Problems

[0006] The end of the first radial plate is bent to form a first bent portion, and the end of the second radial plate is bent to form a second bent portion. The third radiating plate includes a grounding connection portion electrically connected to the grounding surface, and a fan-shaped extension portion extending from the grounding connection portion and gradually widening in width. The third radiating plate further includes a third bent portion formed by bending its end portion, and the height of the third radiating plate is greater than the heights of the first and second radiating plates.

[0007] A portion of the third bent portion overlaps vertically with portions of the first bent portion and the second bent portion. The first and second radiating plates have the same shape and are arranged to have a symmetrical structure.

[0008] The power supply unit includes a power supply line, a first round-type open stub and a second round-type open stub that protrude from both sides of the power supply line in a rounded structure, and a power supply plate connected to the power supply line, the first radiating plate and the second radiating plate being electrically coupled to the power supply plate. Rectangular slots are formed in the first radiating plate and the second radiating plate. The vehicle-integrated antenna further includes a fourth radiating plate that is separated from the first and second radiating plates, electrically coupled to the power supply unit, and extends from the substrate at an angle inclined in a third direction perpendicular to the first and second directions.

[0009] Another built-in vehicle antenna according to the present invention comprises: a substrate with a power supply section formed at the top and a ground surface formed at the bottom; a first radiating plate electrically coupled to the power supply section and extending from the substrate at an angle inclined in a first direction; a second radiating plate separated from the first radiating plate, electrically coupled to the power supply section, and extending from the substrate at an angle inclined in a second direction opposite to the first direction; and a third radiating plate electrically connected to the ground surface, separated from the first and second radiating plates, and positioned to be electromagnetically coupled to the first and second radiating plates. The third radiating plate includes a plate, the end of which the first radiating plate is bent to form a first bent portion, the end of which the second radiating plate is bent to form a second bent portion, the third radiating plate includes a grounding connection portion electrically connected to the grounding surface, a fan-shaped extension portion extending from the grounding connection portion and gradually widening in width, and a third bent portion formed by bending the end portion, the height of the third radiating plate being greater than the heights of the first and second radiating plates, and a portion of the third bent portion overlapping vertically with a portion of the first and second bent portions. [Effects of the Invention]

[0010] The vehicle-mounted antenna of the present invention has the advantages of being able to be manufactured with low manufacturing complexity and low manufacturing cost, and having high radiation gain in all directions. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing the structure of a vehicle-mounted antenna according to one embodiment of the present invention. [Figure 2]This is a first side view of a vehicle-mounted antenna according to one embodiment of the present invention. [Figure 3] This is a second side view of a vehicle-mounted antenna according to one embodiment of the present invention. [Figure 4] This is a top view of an antenna according to one embodiment of the present invention. [Figure 5] This is a drawing showing the structure of a power supply unit formed on a substrate according to one embodiment of the present invention. [Figure 6] This graph compares the reflection loss of an antenna according to one embodiment of the present invention with the reflection loss when the third radiating plate does not have a fan-type structure. [Figure 7] This graph compares the reflection losses of an antenna and a reference antenna according to one embodiment of the present invention. [Modes for carrying out the invention]

[0012] To understand the operational advantages and objectives of the present invention, preferred embodiments of the present invention are illustrated.

[0013] The present invention will be described in detail below by referring to the attached drawings to describe preferred embodiments. However, the present invention can be embodied in a variety of different forms and is not limited to the embodiments described. Furthermore, in order to clearly illustrate the present invention, parts that are not relevant to the description have been omitted, and the same reference numerals in the drawings indicate the same component.

[0014] Throughout the specification, when a part "includes" a component, this does not mean that other components are excluded, but rather that other components may be included, unless otherwise stated. Furthermore, terms such as "part," "machine," "module," and "block" used in the specification mean a unit that processes at least one function or operation, which can be embodied in hardware, software, or a combination of hardware and software.

[0015] Figure 1 is a perspective view showing the structure of a vehicle-integrated antenna according to one embodiment of the present invention, Figure 2 is a first side view of a vehicle-integrated antenna according to one embodiment of the present invention, and Figure 3 is a second side view of a vehicle-integrated antenna according to one embodiment of the present invention.

[0016] As shown in Figures 1 to 3, a vehicle-mounted antenna according to one embodiment of the present invention includes a first radiating plate 100, a second radiating plate 200, a third radiating plate 300, a fourth radiating plate 400, and a substrate 500. The first to fourth radiating plates 100, 200, 300, and 400 are fixed on the substrate 500. The first radiating plate 100 and the second radiating plate 200 have the same shape and are electrically coupled to a power supply section (not shown in Figures 1 to 3) formed on the upper part of the substrate 500.

[0017] The first radiating plate 100 to the fourth radiating plate 400 are manufactured by forming a conductive metal plate. The first radiating plate extends from the substrate 500 at an angle inclined in the first direction. The first radiating plate 100 also has a structure in which its width gradually increases as it moves away from the substrate. The first radiating plate 100 has its narrowest width at the lower end where it connects to the substrate and its widest width at the upper end. The upper end of the first radiating plate 100 is bent, and the first bent portion 110 of the first radiating plate 100 is parallel to the substrate. A first slot 120 is formed in the center of the first radiating plate 100, and the first slot 120 has a rectangular structure.

[0018] The second radiation plate 200 is formed at a position facing the first radiation plate 100, and the second radiation plate 200 and the first radiation plate 100 are arranged in a left-right symmetric structure. Thereby, the second radiation plate 200 extends at an angle inclined in the second direction. The second radiation plate 200 also has a structure in which the width gradually widens as it moves away from the substrate. The second radiation plate 200 has the narrowest width at the joint portion with the substrate, which is the lower end portion, and the widest width at the upper end portion. The upper end portion of the second radiation plate 200 is bent, and the second bent portion 210 of the second radiation plate 200 is also in a state parallel to the substrate. A second slot 220 is formed in the central portion of the second radiation plate 200.

[0019] The first radiation plate 100 and the second radiation plate 200 are electrically connected to a power supply portion on the substrate 500 to provide a power supply signal, and radiate the provided power supply signal to the outside. It is important that the vehicle-mounted built-in antenna has omnidirectional radiation characteristics. The present invention ensures omnidirectional radiation characteristics through the first radiation plate 100 and the second radiation plate 200 that have a left-right symmetric structure with each other while the width gradually widens. Since the first radiation plate 100 and the second radiation plate 200 are formed by simple shaping of a conductive metal plate, it is possible to manufacture them with a simple manufacturing complexity and a low manufacturing cost compared to existing conical radiators.

[0020] On the one hand, the built-in antenna for a vehicle of the present invention further includes a third radiation plate. The third radiation plate 300 includes a ground connection portion 310, a fan-shaped extension portion 320, and a third bending portion 330. The ground connection portion 310 is electrically connected to a ground plane formed at the lower portion of the substrate 500. The ground connection portion 310 and the fan-shaped extension portion 320 are of the same body, and the fan-shaped extension portion 320 extends from the ground connection portion 310 and the end. The fan-shaped extension portion 320 has a structure in which the width gradually increases like the first radiation plate 100 and the second radiation plate 200. The fan-shaped extension portion 320 continuously extends in width to a specific point. Thereby, the fan-shaped extension portion 320 has a hexagonal structure, and the end point from the point where the extension ends has a rectangular structure. The structure in which the width of the fan-shaped extension portion 320 increases in the third radiation plate 300 is a structure that contributes to improving the reflection loss of the antenna of the present invention, and it is possible to ensure an appropriate radiation gain by the fan-shaped extension portion 320.

[0021] On the other hand, the upper end portion of the third radiation plate 300 is bent to form a third bending portion 330. The third bending portion 330 is also in a state parallel to the substrate 500. The height of the third radiation plate 300 is higher than that of the first radiation plate 100 and the second radiation plate 200. Thereby, the third bending portion 300 is formed at a higher portion compared to the first bending portion 110 and the second bending portion 210.

[0022] The third radiation plate 300 is not directly connected to the feeding portion but is connected to the ground plane, so a feeding signal is not directly provided to the third radiation plate. The third radiation plate 300 assists the radiation of the antenna of the present invention through the coupling of the radiation signals of the first radiation plate 100 and the second radiation plate 200. For the coupling of the radiation signals of the first radiation plate 100 and the second radiation plate 200 to the third radiation plate 300, the third bending portion 330 is arranged adjacent to the first bending portion 110 and the second bending portion 210, and a part of the third bending portion 330 is arranged to be vertically overlapped with a part of the first bending portion 110 and the second bending portion 210.

[0023] Figure 4 is a top view of an antenna according to one embodiment of the present invention. As can be seen in Figures 2 and 4, a portion of the third bent portion 330 overlaps vertically with a portion of the first bent portion 110 and a portion of the second bent portion 210, and each bent portion is adjacent to the first radiating plate 100 and the second radiating plate 200 so as to enable electromagnetic coupling from the first radiating plate 100 and the second radiating plate 200 to the third radiating plate 300.

[0024] On the other hand, Figure 2 shows a structure in which the first radiating plate 100 to the third radiating plate 300 penetrate the substrate 500. However, the shown substrate penetration structure is for mechanical fixing of the first radiating plate 100 to the third radiating plate 300, and the substrate penetration structure is not a mandatory requirement. The first radiating plate 100 and the second radiating plate 200 only need to be connected to the power supply section at the top of the substrate 500, and the third radiating plate 300 only needs to be connected to the grounding surface at the bottom of the substrate 500.

[0025] The fourth radiating plate 400 is electrically connected to the power supply section at the top of the substrate 500 and extends in a third direction at a specific angle. The fourth radiating plate 400 also has a fan-type structure that gradually widens, like the first radiating plate 100 and the second radiating plate 200. The fourth radiating plate 400 is a radiating plate for radiating higher bandwidth signals compared to the first radiating plate 100 and the second radiating plate 200. If high bandwidth signal radiation is not required, the fourth radiating plate 400 may not be provided. The first direction in which the first radiating plate 100 tilts and the second direction in which the second radiating plate tilts are opposite to each other, and it is desirable that the third direction in which the fourth radiating plate tilts is perpendicular to the first and second directions.

[0026] Figure 5 is a diagram showing the structure of a power supply unit formed on a substrate according to one embodiment of the present invention. As shown in Figure 5, the power supply unit formed on a substrate according to one embodiment of the present invention includes a power supply line 600, a round-type first open stub 610, a round-type second open stub 620, and a power supply plate 630. The power supply line 600 is electrically connected to a power supply line or power supply connector that provides power supply signals. For example, a power supply line or power supply connector may be connected to the end of the power supply line 600 so that power supply signals are provided through the power supply line 600.

[0027] A round-type first open stub 610 and a round-type second open stub 620 are coupled to the power transmission line 600. The round-type first open stub 610 protrudes in a rounded structure to the left of the power transmission line 600, and the round-type second open stub 620 protrudes in a rounded structure to the right of the power transmission line 600. It is desirable that the round-type first open stub 610 and the round-type second open stub 620 have a symmetrical structure with respect to the power transmission line 600. By forming the round-type first open stub 610 and the round-type second open stub 620 symmetrically, reflection loss is improved and resonance occurs in the intended frequency band.

[0028] A power supply plate 630 is formed at the end of the power supply line 600. As shown in Figure 5, it is preferable that the power supply line 600 has a circular shape. The first radiating plate 100, the second radiating plate 200, and the fourth radiating plate 400 are connected to the power supply plate 630. As mentioned above, the power supply section shown in Figure 5 is formed on the upper part of the substrate 500.

[0029] Figure 6 is a graph comparing the reflection loss of an antenna according to one embodiment of the present invention with the reflection loss when the third radiating plate does not have a fan-type structure. For reference, the graph shown in Figure 6 shows the reflection loss when the third radiating plate is not provided. In Figure 6, graph 1 shows the reflection loss of an antenna according to one embodiment of the present invention, and graph 2 shows the reflection loss when the third radiating plate does not have a fan-type structure and has the same width.

[0030] As shown in Figure 6, when the radiating plate does not have a fan-shaped structure, it can be confirmed that it has low reflection loss in the low bandwidth. However, when the radiating plate has a fan-shaped extension that gradually widens, as in the present invention, it can be confirmed that it has high reflection loss in the low bandwidth, resulting in high radiation efficiency in the low bandwidth and relatively broadband characteristics. Therefore, when radiation is performed through the first and second radiating plates 100 and 200 as in the present invention, it can be confirmed from Figure 6 that when the third radiating plate has a fan-shaped structure that gradually widens, it has the intended reflection loss characteristics.

[0031] Figure 7 is a graph comparing the reflection loss of an antenna according to one embodiment of the present invention and a reference antenna. In Figure 7, the first graph shows the reflection loss of the antenna according to one embodiment of the present invention, the second graph shows the reflection loss of the antenna according to one embodiment of the present invention with the third radiating plate removed, and the third graph shows the reflection loss of the antenna according to one embodiment of the present invention with the third radiating plate and two round open stubs removed.

[0032] As shown in the third graph of Figure 7, when both the two round open stubs and the third radiating plate are removed, it is not possible to obtain adequate reflection loss, and it can be seen that it is difficult to form a resonant frequency at the desired resonance point. As shown in the second graph of Figure 7, it can be seen that the two round open stubs form a resonant frequency in the desired bandwidth. However, since the third radiating plate is absent, it can be seen that there is still low reflection loss. Through the graphs of Figure 7, it can be seen that the radiating plate with the fan-shaped extension of the present invention ensures the desired reflection loss, and thereby improves the radiation gain.

[0033] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely illustrative, and those skilled in the art will understand that a variety of modifications and equivalent other embodiments are possible. Therefore, the true scope of technical protection of the present invention must be determined by the technical idea of ​​the claims. [Explanation of Symbols]

[0034] 100 First Radiation Plate 110 1st bending section 120 1st slot 200 Second Radiation Plate 210 2nd bending section 220 Second slot 300 Third Radiation Plate 310 Ground connection 320 Fan-type extension 330 3rd bending section 400 Fourth Radial Plate 500 circuit boards 600 Power supply lines 610 Round Type First Open Stub 620 Round Type Second Open Stub 630 Power supply plate

Claims

1. A circuit board with a power supply section formed at the top and a grounding surface formed at the bottom, A first radiating plate is electrically coupled to the power supply unit and extends from the substrate at an angle inclined in a first direction, A second radiating plate is separated from the first radiating plate, electrically coupled to the power supply unit, and extends from the substrate at an angle inclined in a second direction opposite to the first direction, A third radiating plate is electrically connected to the ground surface, spaced apart from the first and second radiating plates, and positioned to be electromagnetically coupled with the first and second radiating plates, A built-in antenna for a vehicle, characterized in that the first radiating plate and the second radiating plate have a structure in which their width gradually increases as they move away from the substrate.

2. The vehicle-mounted antenna according to claim 1, characterized in that the end of the first radiating plate is bent to form a first bent portion, and the end of the second radiating plate is bent to form a second bent portion.

3. The vehicle-integrated antenna according to claim 2, characterized in that the third radiating plate includes a grounding connection portion electrically connected to the grounding surface and a fan-shaped extension portion extending from the grounding connection portion and gradually widening in width.

4. The vehicle-type built-in antenna according to claim 3, wherein the third radiating plate further includes a third bent portion formed by bending its terminal end, and the height of the third radiating plate is greater than the heights of the first and second radiating plates.

5. The vehicle-mounted antenna according to claim 4, characterized in that a part of the third bent portion overlaps vertically with a part of the first bent portion and a part of the second bent portion.

6. The vehicle-mounted antenna according to claim 1, characterized in that the first radiating plate and the second radiating plate have the same shape and are arranged to have a symmetrical structure.

7. The power supply unit includes a power supply line, a first round open stub and a second round open stub that protrude from both sides of the power supply line in a rounded structure, and a power supply plate connected to the power supply line, wherein the first radiating plate and the second radiating plate are electrically coupled to the power supply plate, as described in claim 6.

8. The vehicle-mounted antenna according to claim 1, characterized in that rectangular slots are formed in the first radiating plate and the second radiating plate.

9. The vehicle-integrated antenna according to claim 1, further comprising a fourth radiating plate that is separated from the first radiating plate and the second radiating plate, electrically coupled to the power supply unit, and extending from the substrate at an angle inclined in a third direction perpendicular to the first direction.

10. A circuit board with a power supply section formed at the top and a grounding surface formed at the bottom, A first radiating plate is electrically coupled to the power supply unit and extends from the substrate at an angle inclined in a first direction, A second radiating plate is separated from the first radiating plate, electrically coupled to the power supply unit, and extends from the substrate at an angle inclined in a second direction opposite to the first direction, A third radiating plate is electrically connected to the ground surface, spaced apart from the first and second radiating plates, and positioned to be electromagnetically coupled with the first and second radiating plates, The end of the first radial plate is bent to form a first bent portion, and the end of the second radial plate is bent to form a second bent portion. The third radiating plate includes a grounding connection portion electrically connected to the grounding surface, a fan-shaped extension portion extending from the grounding connection portion and gradually widening in width, and a third bent portion formed by bending the end portion, wherein the height of the third radiating plate is greater than the heights of the first and second radiating plates. A built-in antenna for a vehicle, characterized in that a portion of the third bent portion overlaps vertically with a portion of the first bent portion and a portion of the second bent portion.

11. The vehicle-mounted antenna according to claim 10, characterized in that the first radiating plate and the second radiating plate have a structure in which their width gradually increases as they move away from the substrate.

12. The vehicle-mounted antenna according to claim 11, characterized in that the first radiating plate and the second radiating plate have the same shape and are arranged to have a symmetrical structure.

13. The power supply section includes a power supply line, a first round open stub and a second round open stub that protrude from both sides of the power supply line in a rounded structure, and a power supply plate connected to the power supply line, wherein the first radiating plate and the second radiating plate are electrically coupled to the power supply plate, as described in claim 10.

14. The vehicle-mounted antenna according to claim 12, characterized in that rectangular slots are formed in the first radiating plate and the second radiating plate.

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