KR101850061B1 - The Wide band Antenna for a Vehicle - Google Patents

Abstract

The present invention relates to a broadband antenna for a vehicle, comprising an upper printed circuit board (PCB) including a circular power supply pattern and an earth pattern formed at predetermined intervals along the circumference of the power supply pattern; a lower PCB formed corresponding to the upper PCB at a predetermined interval and having a coaxial cable arranged thereon to supply a power supply signal; and a conical monopole radiation device formed in a reverse vertical structure to allow the vertex of a cone to be downwardly disposed between the upper and lower PCBs. Accordingly, provided are effects of satisfying miniaturization of an antenna and providing an antenna with high efficiency antenna characteristics and broadband antenna characteristics.

Description

[0001] The present invention relates to a wideband antenna for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a vehicular broadband antenna, and more particularly, to a vehicular broadband antenna that can satisfy an antenna miniaturization and can have a high efficiency antenna characteristic and operates in a wide band.

BACKGROUND ART [0002] With the recent development of communication technologies, wireless communication devices that transmit and receive wireless signals have been rapidly made smaller, lighter, and have higher performance.

Especially, due to the rapid spread of personal communication terminals called smart phones, the mobile communication technology applied to smart phones has been changed from the existing 2nd generation and 3rd generation communication methods such as GSM, CDMA and WCDMA through the 4th generation LTE communication method to 5 Wireless communication technologies such as Bluetooth, Global Positioning System (GPS), and Wireless Fidelity (WIFI) are being integrated.

Meanwhile, in order to support a variety of communication systems, a lot of efforts have been made to mount a plurality of antennas in a vehicle communication terminal, but it is difficult to mount a plurality of antennas due to limitations of the vehicle structure.

Accordingly, there is an increasing interest in a broadband antenna for a vehicle that operates by covering a variety of frequency bands using a single antenna structure, and there is a growing need for an antenna design technique therefor.

However, since the vehicle wideband antenna according to the related art is mounted on a very large metal body upper surface constituting the roof of the vehicle when mounted on a vehicle, when the antenna position is intended to be located at a predetermined distance or more from the metal body It is difficult to increase the antenna efficiency in all the resonance frequency bands at the same time in the case of implementing the multi-band based on the wide bandwidth, so that the time and effort for the antenna design are increased There was a problem.

Conventional tunable antenna technology has been applied to improve the problem of the conventional broadband antenna for a vehicle. However, the tunable antenna technology has been widely used in various fields including an increase in manufacturing cost, an increase in a design period, and an increase in power consumption Problems are occurring.

Therefore, even when mounting on the upper surface of the metal body of the vehicle, the height formed on the vehicle body surface can be reduced, and the antenna characteristics can be high in all the resonance frequency bands, A technology for a broadband antenna for a vehicle that exhibits a broadband antenna characteristic with a small antenna and a wide operating frequency band and has a high efficiency is strongly demanded.

Korea Registered Utility Model No. 20-0258136 December 24, 2001 (Registered Date of Publication)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a broadband antenna for a vehicle that can satisfy antenna miniaturization, has high efficiency antenna characteristics, and operates in a wide band.

The vehicle broadband antenna according to an embodiment of the present invention includes an upper printed circuit board having a circular power supply pattern and a ground pattern spaced apart from the power supply pattern at regular intervals; A lower printed circuit board formed to correspond to the upper printed circuit board at a predetermined interval and adapted to apply a power feed signal; And a conical monopole radiating element formed between the upper printed circuit board and the lower printed circuit board in a vertically inverted configuration such that a vertex side of the cone is arranged in a downward direction; .

The upper printed circuit board may include at least one pair of slot-shaped slots disposed opposite to each other with the circular power supply pattern interposed therebetween in a region where the ground pattern is formed.

The upper printed circuit board may include an inter digit unit for inducing electromagnetic coupling at a point where the circular power supply pattern and the ground pattern are spaced apart from each other by a predetermined distance.

The interdigitated portion may include a plurality of straight metal patterns formed at regular intervals in an annular spaced apart portion formed by the circular power supply pattern and the ground pattern at a predetermined interval, And the plurality of meander lines formed at the ends of the plurality of meander lines cross each other.

The vehicle broadband antenna according to an embodiment of the present invention is characterized in that the upper printed circuit board and the lower printed circuit board are vertically fixed to each other and a ground pattern formed on a lower surface of the upper printed circuit board and a ground pattern formed on a lower surface of the lower printed circuit board And a plurality of shorting pins which are connected and fixed to the ground plane formed on the upper surface and the lower surface of the ground plane, respectively, so as to penetrate the substrate.

The plurality of shorting pins may be formed so as to correspond to the linear slots disposed opposite to each other and the upper ends thereof may be disposed adjacent to the widthwise outer edge centers of the linear slots.

The upper printed circuit board is formed by passing through the central portion of the circular feed pattern provided at the central portion of the lower surface from the central portion of the upper surface to be screwed with the central portion of one end of the conical monopole radiating element at the central portion of the circular feed pattern And a conductive thin film electrically connected to the monopole radiation element may be formed on a side surface of the first connection hole.

The circular power feeding pattern may be disposed so that the overall shape corresponds to the lower surface of the cone-shaped monopole radiating element and is electrically connected to the lower surface of the cone-shaped monopole radiating element.

Wherein the lower printed circuit board has a second fastening hole for screwing the conical monopole radiating element end surface of the conical monopole radiating element in a central portion thereof, A conductive thin film can be formed.

The lower printed circuit board includes a coaxial cable for applying a power feed signal in a longitudinal direction of the central portion from one side of the upper surface thereof and a strip line for electrically connecting the inner core of the coaxial cable and the inner side surface of the second tightening hole, And may be formed adjacent to the second fastening hole in the upper center portion.

The vehicle broadband antenna according to an embodiment of the present invention includes an upper printed circuit board having a circular power supply pattern and a ground pattern spaced apart from the power supply pattern at regular intervals; A lower printed circuit board formed on a lower surface of the lower printed circuit board and having a ground plane formed on the lower surface of the coaxial cable; And a conical monopole radiating element formed between the upper printed circuit board and the lower printed circuit board in a vertically inverted configuration such that a vertex side of the cone is arranged in a downward direction; When a feed signal is applied to the coaxial cable, a feed signal is input to the monopole radiating element to form a resonance in a first frequency band.

In the broadband antenna for a vehicle according to an embodiment of the present invention, the upper printed circuit board may include linear slots disposed opposite to each other with the circular power supply pattern interposed therebetween, at least one pair An interdigit portion for inducing electromagnetic coupling is formed at a portion where the circular power supply pattern and the ground pattern are spaced apart from each other by a predetermined distance, and the upper printed circuit board and the lower printed circuit board are vertically fixed to each other Wherein when a feed signal is input through the monopole radiating element, a feed signal is supplied to a circular feed pattern formed on the upper printed circuit board, and electromagnetic coupling is generated in the interdigit portion, The current induced in the slot and the current concentrated on the shorting pin cause the second frequency band An inverse resonance can be formed.

The broadband antenna for a vehicle according to an embodiment of the present invention may have a wideband impedance matching in the first frequency band and the second frequency band by an inductance and a capacitance component formed in the interdigit portion.

The vehicular broadband antenna according to an embodiment of the present invention is characterized in that the first frequency band formed by the monopole radiating element is relatively inferior to the second frequency band formed in the straight slot and the shorting pin by the electromagnetic coupling by the interdigit portion The frequency band may be high.

INDUSTRIAL APPLICABILITY As described above, the present invention has an effect of providing a broadband antenna for a vehicle that can satisfy antenna miniaturization, has high efficiency antenna characteristics, and has broadband antenna characteristics.

It is another object of the present invention to reduce the influence of a metal body by using a ground pattern and a ground pattern formed on an upper circuit board and a lower circuit board of the antenna itself, So that it is possible to minimize the height of the antenna and even the buried structure, and it is possible to provide a broadband antenna for a vehicle in which the performance change of the antenna is minimized at any position of the vehicle.

In addition, the present invention can facilitate impedance matching by using an interdigit portion for inducing electromagnetic coupling even if a chip element of an inductance or a capacitance component is not used for antenna impedance matching. As a result, the antenna efficiency is improved, Thereby reducing the manufacturing cost.

The present invention also provides a vehicle antenna capable of reducing the size of an antenna within a limited space by simultaneously using a conical conductor as a monopole radiating element and a multi-band power feeding means, thereby enabling miniaturization and operation in a wide band and multiple bands .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the overall configuration of a vehicular broadband antenna according to a first embodiment of the present invention; FIG.
FIG. 2 is a view for explaining the lower surface of the upper printed circuit board constituting the vehicular broadband antenna shown in FIG. 1; FIG.
3 is a diagram showing the overall configuration of a vehicle wideband antenna according to a second embodiment of the present invention.
4 is a view for explaining the lower surface of the upper printed circuit board constituting the vehicular broadband antenna shown in FIG.
5 is a bottom view of an upper printed circuit board constituting a vehicular broadband antenna according to a second embodiment of the present invention.
6 is a top view of an upper printed circuit board constituting a vehicle wideband antenna according to a second embodiment of the present invention.
7 is a view for explaining a cone-shaped monopole radiating element constituting the vehicular broadband antenna shown in Figs. 1 to 4. Fig.
FIGS. 8 and 9 are views for explaining a coaxial cable and a strip line disposed on a lower printed circuit board constituting the vehicular broadband antenna shown in FIGS. 1 to 4. FIG.
10 is a view showing antenna characteristics of the vehicular broadband antenna shown in Figs. 1 and 2 according to the first embodiment of the present invention.
11 is a view showing antenna characteristics of the vehicular broadband antenna shown in Figs. 3 and 4 according to the second embodiment of the present invention.
FIG. 12 is a diagram for comparing antenna characteristics shown in FIG. 10 and FIG.
FIG. 13 is a diagram for comparing antenna efficiency of an antenna for a vehicle-use crossover according to the first and second embodiments of the present invention.

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas.

Meanwhile, the meaning of the terms described in the present invention should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present invention.

The vehicle wideband antenna according to the present invention can operate in a frequency range having a frequency band of 791 MHz to 2690 MHz and a bandwidth of 1899 MHz and can operate in multiple bands having a bandwidth of 791 MHz to 2690 MHz without using any additional technology or device, Efficiency can be provided.

Here, the multi-band in which the antenna operates may have a first frequency band of 1.71 GHz to 2.69 GHz and a second frequency band of 791 MHz to 960 MHz.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the overall configuration of a vehicular broadband antenna according to a first embodiment of the present invention; FIG.

As shown in the figure, the vehicle wideband antenna according to the first embodiment of the present invention may include an upper printed circuit board 100, a lower printed circuit board 200, and a conical monopole radiating element 300 have.

More specifically, the upper printed circuit board 100 is formed of a dielectric substrate including a lower surface 101 formed as a metal thin film layer in a rectangular shape as a whole and an upper surface 102 formed of a dielectric layer, 101 may have a circular power feeding pattern 110 formed at the center thereof as a metal thin film.

Here, the circular power feeding pattern 110 is formed in a shape and size corresponding to a circular end surface formed at a position opposite to the cone of the cone-shaped monopole radiating element 300, And a circular end surface may be disposed in contact with the power feeding pattern 110 so as to be electrically connected.

The lower surface 101 of the upper printed circuit board 100 is grounded at a predetermined distance along the circumference of the circular power feeding pattern 110 to form a ground The pattern 120 may be formed.

The upper printed circuit board 100 may further include a lower surface (not shown) extending from the center of the upper surface 102 to the central portion of one end surface of the conical monopole radiating element 300 at the central portion of the circular power feeding pattern 110 The monopole radiating element 110 may include a first coupling hole 130 formed through a central portion of the circular power feeding pattern 110 provided at a central portion of the first coupling hole 130, 300 may be formed on the conductive thin film.

The lower printed circuit board 200 may have a rectangular shape corresponding to the upper printed circuit board 100 and may be spaced apart from the upper printed circuit board 100 in the vertical direction by a predetermined distance. A coaxial cable 400 for applying a feed signal on the upper surface can be disposed.

Here, the lower printed circuit board 200 may include a second fastening hole 230 for screwing the distal end of the cone-shaped monopole radiating element 300 on the apex of the cone, A conductive thin film for electrically connecting the monopole radiating element 300 may be formed on the inner surface of the fastening hole 230.

In addition, the conical monopole radiating element 300 may be formed in a vertically inverted structure such that vertexes of cones are arranged in a downward direction between the upper printed circuit board 100 and the lower printed circuit board 200, A feed signal applied from the coaxial cable 400 disposed on the circuit board 200 may be transmitted to the feed pattern 110 formed on the lower surface 101 of the upper printed circuit board 100.

FIG. 2 is a view for explaining the lower surface of the upper printed circuit board constituting the vehicular broadband antenna shown in FIG. 1; FIG.

As shown in the figure, an upper printed circuit board 100 constituting a broadband antenna for a vehicle according to the first embodiment of the present invention includes a circular feed pattern 110, At least one pair of slots 140 may be provided at a portion where the ground pattern 120 is formed.

The vehicle broadband antenna according to the first embodiment of the present invention may further include a plurality of shorting pins 500 for vertically fixing the upper printed circuit board 100 and the lower printed circuit board 200 to each other .

The shorting pin 500 includes a ground pattern 120 formed on a lower surface 101 of the upper printed circuit board 100 and a ground surface formed on a lower surface of the lower printed circuit board 200 210 can be connected and fixed in a state in which both upper and lower ends thereof penetrate the substrate.

The shorting pins 500 are formed so as to correspond to the slot-like slots 140 which are disposed to face each other. The upper ends of the shorting pins 500 are connected to the widthwise outer edges of the slot- And may be disposed adjacent to the center.

As described above, in the vehicular broadband antenna according to the first embodiment of the present invention, when a feed signal is applied to the coaxial cable 400 disposed on the lower printed circuit board 200, A feed signal is input to the feed pattern 110 formed on the upper printed circuit board 100 while the resonance of the frequency band is formed and the circular feed pattern 110 and the ground pattern 120 are spaced apart from each other by a predetermined interval The resonance in the second frequency band is formed by the current induced in the linear slot 140 and the current concentrated in the shorting pin 500 due to electromagnetic coupling in the annular spacing part 150 formed to be spaced apart .

The coupling between the circular power feeding pattern 110 and the ground pattern 120 at the annular spacing 150 formed at a predetermined distance from each other causes the impedance in the multi- And it is possible to optimize by adjusting the amount of inductance and capacitance for impedance matching.

FIG. 3 is a view showing the overall configuration of a broadband antenna for a vehicle according to a second embodiment of the present invention. FIG. 4 is a perspective view for explaining the lower surface of the upper printed circuit board constituting the vehicular broadband antenna shown in FIG. FIG.

As shown in the figure, a broadband antenna for a vehicle according to a second embodiment of the present invention may include an upper printed circuit board 100, a lower printed circuit board 200, and a conical monopole radiating element 300 have.

The upper printed circuit board 100 is formed of a dielectric substrate including a lower surface 101 formed of a metal thin film layer as a whole and an upper surface 102 formed of a dielectric layer as a whole, The power supply pattern 110 may be formed of a conductive material.

Here, the circular power feeding pattern 110 is formed in a shape and size corresponding to a circular end surface formed at a position opposite to the vertex of the cone of the cone-shaped monopole radiating element 300, and the monopole radiating element 300 May be disposed in contact with the power feeding pattern 110 so as to be electrically connected.

The lower surface 101 of the upper printed circuit board 100 is formed with a grounded metal foil which is entirely formed around the periphery of the lower surface 101 so as to be spaced apart from the circumference of the circular power feeding pattern 110, The pattern 120 may be formed.

The upper printed circuit board 100 may further include a lower surface (not shown) extending from the center of the upper surface 102 to the central portion of one end surface of the conical monopole radiating element 300 at the central portion of the circular power feeding pattern 110 The monopole radiating element 110 may include a first coupling hole 130 formed through a central portion of the circular power feeding pattern 110 provided at a central portion of the first coupling hole 130, 300 may be formed on the conductive thin film.

The lower printed circuit board 200 may have a rectangular shape corresponding to the upper printed circuit board 100 and may be spaced apart from the upper printed circuit board 100 by a predetermined distance in the vertical direction. A coaxial cable 400 for applying a feed signal on the surface can be disposed.

Here, the lower printed circuit board 200 may include a second fastening hole 230 for screwing a vertex end face of the cone of the cone-shaped monopole radiating element 300 at the central portion thereof, A conductive thin film may be formed on the inner surface of the hole 230 to electrically connect to the monopole radiating element 300.

In addition, the conical monopole radiating element 300 is formed between the upper printed circuit board 100 and the lower printed circuit board 200 in a vertically reverse direction so that the apex side of the cone is arranged in a downward direction, A feed signal applied from a coaxial cable 400 disposed on the lower printed circuit board 200 may be transmitted to the feed pattern 110 of the upper printed circuit board 100.

 The upper printed circuit board 100 constituting the broadband antenna for a vehicle according to the second embodiment of the present invention includes a linear slot 140 disposed opposite to each other with a circular power feeding pattern 110 interposed therebetween, At least one pair of the pattern 120 may be formed.

The vehicle broadband antenna according to the second embodiment of the present invention further includes a plurality of shorting pins 500 for vertically fixing the upper printed circuit board 100 and the lower printed circuit board 200 to each other .

The shorting pin 500 includes a ground pattern 120 formed on a lower surface 101 of the upper printed circuit board 100 and a ground surface 210 formed on a lower surface of the lower printed circuit board 200 The upper and lower ends thereof can be connected and fixed in a state of penetrating through the substrates.

The shorting pins 500 are formed so as to correspond to the slot-like slots 140 which are disposed to face each other. The upper ends of the shorting pins 500 are connected to the widthwise outer edges of the slot- And may be disposed adjacent to the center.

The vehicle broadband antenna according to the second embodiment of the present invention is different from the first embodiment described above with reference to FIGS. 1 and 2, except that the wideband antenna is formed on the lower surface 101 of the upper printed circuit board 100, The interdigitated portion 160 may be formed in the spacing portion 150 where the circular power feeding pattern 110 and the grounding pattern 120 are spaced apart from each other by a predetermined distance.

At this time, the interdigitated portion 160 is formed in an annular spaced apart portion 150 formed with the circular power feeding pattern 110 and the grounding pattern 120 facing each other at regular intervals, A plurality of straight metal patterns may be formed so as to intersect at regular intervals and have a structure in which a plurality of meander lines formed at opposite ends of the power feeding pattern 110 and the grounding pattern 120 intersect each other .

As described above, when the feed signal is applied to the coaxial cable 400 disposed on the lower printed circuit board 200 according to the second embodiment of the present invention, A feed signal is input to the feed pattern 110 formed on the lower surface 101 of the upper printed circuit board 100 while forming a resonance in the frequency band and the feed pattern 110 and the ground pattern 120, An electrical coupling is generated in the interdigitated portion 160 formed at the annular spacing portion 150 spaced apart from each other by a predetermined distance so that a current induced in the linear slot 140 and a short- The resonance in the second frequency band can be formed by the current concentrated in the second frequency band.

Accordingly, in the broadband antenna for a vehicle according to the second embodiment of the present invention, the circular power feeding pattern 110 and the ground pattern 120 are spaced apart from each other by a predetermined distance, Since the inductance component and the capacitance component generated by the electromagnetic coupling in the interdigitized portion 150 formed in the antenna 150 are large, good antenna characteristics in the high frequency band and impedance matching in the multiple bands can be achieved.

That is, since the electromagnetic coupling section of the pattern for forming the interdigitated section 160 is much wider and has an electromagnetic coupling section in many areas, compared with the first embodiment, the vehicle wideband antenna according to the second embodiment of the present invention, Since the inductance component and the capacitance component that are magnetically coupled can be provided, impedance matching over a wide band can be achieved without using chip inductors and chip capacitances.

In addition, since only the ground included in the antenna structure is used without using the metal body of the vehicle as a ground plane, it is possible to provide an antenna with less influence by the body made of metal and with minimal performance change due to the mounting position have.

FIG. 5 is a bottom view of an upper printed circuit board constituting a broadband antenna for a vehicle according to a second embodiment of the present invention. FIG. 6 is a top view of the upper printed circuit board constituting the vehicular broadband antenna according to the second embodiment of the present invention. Fig. 7 is a view showing an upper surface of a circuit board.

As shown in the drawing, an upper printed circuit board 100 constituting a broadband antenna for a vehicle according to an embodiment of the present invention includes a circular feed pattern 110 and a ground pattern 120, And is formed on the other side of the dielectric layer.

Specifically, in the present invention, the one side of the vehicle-use broadband antenna is formed of a metal thin film layer to form a circular power feeding pattern 110 as a lower face 101 and a ground pattern 120 surrounding the power feeding pattern 110 And the other side is formed as a dielectric layer different from the lower surface 101 as the upper surface 102, and the slot-like slot 140 and the spacing portion 150 are formed.

The upper printed circuit board constituting the vehicular broadband antenna according to the embodiment of the present invention includes a feeding pattern 110 for electrically connecting the conical monopole radiating element 300 described above to the center of the lower surface 101 of the antenna 100, Here, the feed pattern 110 may be formed to correspond to the circular end surface of the cone-shaped monopole radiating element 300 described above.

That is, the feed pattern 110 is formed in a size and shape corresponding to the end surface of the cone-shaped monopole radiating element 300 having a circular shape, which is one end surface of the cone-shaped monopole radiating element 300. In the embodiment of the present invention, As shown in FIG.

7 is a view for explaining a cone-shaped monopole radiating element constituting the vehicular broadband antenna shown in Figs. 1 to 4. Fig.

As shown in the figure, in the embodiment of the present invention, it can be seen that the conical monopole radiating element 300 has a conical shape as a whole, but the upper printed circuit board 100 and the lower printed circuit board 200 are formed at the central portions of both upper and lower end surfaces and a female screw is formed on the inner surface of the fixing fastening portion, so that the screw fastening can be made strong.

In the embodiment of the present invention, the conical monopole radiating element 300 has electromagnetic coupling (coupling coupling) in the upper printed circuit board 100 while forming the resonance in the first frequency band as described above And can be used as a power supply for inducing resonance in the second frequency band.

FIGS. 8 and 9 are views for explaining a coaxial cable and a strip line disposed on a lower printed circuit board constituting the vehicular broadband antenna shown in FIGS. 1 to 4. FIG.

As shown in the drawing, a lower printed circuit board 200 constituting a vehicle wideband antenna according to an embodiment of the present invention may be provided with a coaxial cable 400 for applying a power supply signal from one side of the upper surface to a longitudinal direction of the center portion have.

The lower printed circuit board 200 includes a strip line 220 for electrically connecting the inner surface of the coaxial cable 400 and the inner surface of the second fastening hole 230, May be formed adjacent to the fastening hole (230).

Since it is difficult to directly connect the coaxial cable 400 on the antenna structure in order to apply the feed signal to the conical monopole radiating element 300 according to the embodiment of the present invention, First and second fastening holes 130 and 230 having conductive thin films formed on the inner surface of the printed circuit board 200 are formed at the center of the printed circuit board 200 and are screwed together after the conical monopole radiating elements 300 are arranged in the reverse direction. That is, the end of the strip line is formed adjacent to the second fastening hole 230 of the lower printed circuit board 200 so that the second fastening hole 230 and the strip line 220 are electrically connected to each other It is possible to transmit a power supply signal applied to the coaxial cable 400.

As described above, the broadband antenna for a vehicle according to the embodiment of the present invention shown in FIGS. 1 to 9 has a circular power feeding pattern 110 and a power feeding pattern 110 formed apart from each other around the circumference of the power feeding pattern 110 at regular intervals And a coaxial cable 400 that is formed to correspond to the upper printed circuit board 100 and is spaced apart from the upper printed circuit board 100 by a predetermined distance and applies a power feed signal is disposed on the lower printed circuit board 100, A lower printed circuit board 200 on which a ground plane 210 is formed and a vertically inverted structure in which the apexes of cones are arranged in a downward direction between the upper printed circuit board 100 and the lower printed circuit board 200 And a plurality of shorting pins 500 for vertically fixing the upper printed circuit board 100 and the lower printed circuit board 200 to each other.

When a power feed signal is applied to the coaxial cable 400, a feed signal is applied to the monopole radiating element 300 coupled to the second fastening hole 230 of the lower printed circuit board 200 through the strip line 220 And can form a resonance in the first frequency band.

The upper printed circuit board 100 includes a plurality of linear slots 140 disposed on opposite sides of the circular power feeding pattern 110 formed on the lower surface 101, At least one pair may be provided.

Therefore, in the vehicular broadband antenna according to the embodiment of the present invention, a feed signal is supplied to the feed pattern 110 formed on the lower surface 101 of the upper printed circuit board 100, and the circular feed pattern 110, And the ground pattern 120 are spaced apart from each other by a predetermined distance to generate an electromagnetic coupling, so that a current induced in the linear slot 140 is concentrated on the shorting pin 500 The resonance of the second frequency band can be formed by the current.

At this time, interdigitated portions 160 intersecting each other in a meander shape are formed in the annular spaced apart portion 150 where the circular power feeding pattern 110 and the grounding pattern 120 are spaced apart from each other by a predetermined distance A wideband impedance matching can be performed in the first frequency band and the second frequency band by an inductance and a capacitance component formed in the interdigitized unit 160. [

Meanwhile, in the embodiment of the present invention, the first frequency band formed by the monopole radiating element 300 is formed in the linear slot 140 and the shorting pin 150 by electromagnetic coupling by the interdigitation unit 160 The antenna is operated at a relatively high frequency band because the antenna has a short electrical length.

In addition, in the antenna according to the embodiment of the present invention, the cross-section of the radiation pattern is omnidirectional toward the vertical upper direction of the printed circuit board, whereas the vehicular broadband antenna according to the present invention is oriented with respect to the upper direction of the printed circuit board Since the vertical cross section has a heart shape, it is possible to satisfy all the required characteristics of the antenna even if it is mounted at any position of the vehicle or even if it is embedded in the roof of the vehicle.

FIG. 10 is a view showing antenna characteristics of the vehicular broadband antenna shown in FIGS. 1 and 2 according to the first embodiment of the present invention, and FIG. 11 is a cross- And FIG. 12 is a diagram for comparing antenna characteristics shown in FIG. 10 and FIG. 11. As shown in FIG.

As shown in the figure, the broadband antenna for a vehicle according to an embodiment of the present invention satisfies antenna characteristics for operating as an antenna with a reflection loss of -6 db or less in an operating frequency band of 791 MHz to 2690 MHz.

As shown in FIG. 12, it can be seen that the antenna characteristics are improved when the inter digit portion 160 is formed.

As described above, the vehicular broadband antenna according to the embodiment of the present invention can use the monopole radiating element 300 as the feeding means of the multiband, even if the inductance or capacitance element chip is not used for impedance matching, The impedance matching is achieved by the electromagnetic coupling generated in the annular spacing portion 150 spaced apart from the circular power feeding pattern 110 and the ground pattern 120 formed at a predetermined interval from each other and the interdigit portion 160, do.

FIG. 13 is a diagram for comparing antenna efficiency of an antenna for a vehicle-use crossover according to the first and second embodiments of the present invention.

As shown in the figure, the antenna for a vehicle-use crosstalk according to an embodiment of the present invention basically shows resonance at a wide range of 791 MHz to 2690 MHz, and at the same time can provide high efficiency.

That is, the antenna for a vehicle-use crossover according to the embodiment basically has broadband resonance and has an antenna gain of -1.5 dBi in the operating frequency band, and can operate with a good antenna gain value. Can occur.

As described above, the present invention has an effect of providing a broadband antenna for a vehicle that can satisfy the miniaturization of an antenna, can have a high efficiency antenna characteristic, and has a broadband antenna characteristic.

It is another object of the present invention to reduce the influence of a metal body by using a ground pattern and a ground pattern formed on an upper circuit board and a lower circuit board of the antenna itself, It is possible to minimize the height of the antenna and to provide a broadband antenna for a vehicle in which even the buried structure is possible and the mounting position is minimized in the performance change at any position of the vehicle.

In addition, since impedance matching can be facilitated by using an interdigit portion for inducing electromagnetic coupling even if a chip element of an inductance or a capacitance component is not used for antenna impedance matching, the present invention can improve antenna efficiency It has the effect of reducing manufacturing cost by reducing the number of parts.

The present invention also provides an automotive wideband antenna capable of operating in a wide band and multiple bands while reducing the size of an antenna within a limited space by simultaneously using a conical conductor as a monopole radiating element and a coupling power feeding means .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It is within the scope of the present invention that the component changes to such an extent as to cope evenly within a range that does not deviate from the present invention.

100: upper printed circuit board 101: lower surface
102: upper surface 110: feeding pattern
120: ground pattern 130: first fastening hole
140: straight slot 150: spaced apart
160: inter digit unit 200: lower printed circuit board
210: ground plane 220: strip line
230: second fastening hole 300: monopole radiating element
400: coaxial cable 500: shorting pin

Claims (11)

And a ground pattern formed spaced apart at regular intervals along a circumference of the power supply pattern, wherein the ground pattern is formed by sandwiching the circular pattern of the power supply pattern, An upper printed circuit board having at least one pair of the printed circuit boards;
A lower printed circuit board formed to correspond to the upper printed circuit board at a predetermined interval and adapted to apply a power feed signal; And
A conical monopole radiating element formed between the upper printed circuit board and the lower printed circuit board in a vertically reverse direction so that a vertex side of a cone is arranged in a downward direction; And a plurality of antenna elements.
delete The printed circuit board according to claim 1,
Wherein an interdigit portion for inducing electromagnetic coupling is formed at a portion where the circular feed pattern and the ground pattern are spaced apart from each other by a predetermined distance.
The apparatus as claimed in claim 3,
A plurality of straight metal patterns are formed at intersections of the circular feed pattern and the ground pattern at regular intervals so as to be formed at the opposite ends of the feed pattern and the ground pattern, Wherein the plurality of meander lines intersect each other.
The method according to any one of claims 1, 3, and 4,
The upper printed circuit board and the lower printed circuit board are vertically fixed to each other, and a ground pattern formed on the upper printed circuit board and a ground plane formed on the lower printed circuit board are connected to the upper and lower ends, Further comprising a plurality of shorting pins to be fixed.
6. The circuit breaker of claim 5,
And the upper ends thereof are disposed adjacent to the widthwise outer edge center portions of the flat slots.
The printed circuit board according to claim 1,
Wherein the antenna is formed by a side surface on which a circular power supply pattern made of a metal thin film layer and a ground pattern are formed, and another side surface made of a dielectric layer.
8. The printed circuit board according to claim 7,
And a first coupling hole for screwing the central portion of one end of the conical monopole radiating element to the central portion of the circular feed pattern,
And a conductive thin film is formed on a side surface of the first connection hole so as to be electrically connected to the monopole radiating element.
The antenna according to claim 7, wherein the circular feed pattern comprises:
The overall shape is formed to correspond to the lower surface of the cone-shaped monopole radiating element,
And the lower surface of the conical monopole radiating element is electrically connected to the power feeding pattern.
The printed circuit board according to claim 1,
And a second fastening hole for screwing the end portion of the cone-shaped monopole radiating element cone on the apex side,
And a conductive thin film electrically connected to the monopole radiating element is formed on a side surface of the second fastening hole.
The printed circuit board according to claim 10,
A coaxial cable for applying a feed signal from one side of the upper surface to the central portion in the longitudinal direction is disposed,
And a strip line for electrically connecting the inner core of the coaxial cable and the inner side surface of the second coupling hole is formed adjacent to the second coupling hole at the center of the upper surface.

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