KR20050102868A - Coupler type internal chip antenna - Google Patents

Abstract

The present invention relates to a built-in chip antenna of the coupler type, and more particularly, to improve the problem of the chip antenna of ceramic material, to increase the design bandwidth and gain by a coupler method, and to induce a miniaturization and design in a communication device. In the case of mounting a chip-type antenna that can be embedded so that it can be built, the present invention relates to an embedded chip antenna that can induce a secondary coupling signal by utilizing the ground of the PCB.

The chip antenna according to the present invention has an FR-4 dielectric block having a plurality of side surfaces substantially orthogonal to the first and second major surfaces and the first and second major surfaces facing each other, and a partial region of the first principal surface. A radiation pattern formed, a radiation induction pattern extending from the radiation pattern on a portion of one side of the plurality of side surfaces and serving as the radiation pattern and the radiation element, and a portion of the other side surface facing the one side surface A gap point formed by exposing the dielectric block in an area to be spaced apart from the radiation pattern and inputting a signal to a feeding point for inducing a coupler phenomenon, and an outer surface of one of the two outer surfaces except for the one side and the other side And a ground pile formed and electrically connected to the radiation induction pattern.

Description

Coupler type internal chip antenna {Coupler type internal chip antenna}

The present invention relates to a built-in chip antenna of the coupler type, and more particularly, to overcome the fundamental problem of the chip antenna made of ceramic material in the process of miniaturizing the chip type antenna for the purpose of developing the built-in antenna. When the chip type antenna is mounted on the PCB embedded in the communication device, the design band and gain are increased by the coupler method, and the chip antenna can be used to induce the secondary coupling signal by using the ground of the PCB. It is about.

In general, a small antenna is a start point and end point of a signal modulated in a microwave band by being mounted on a mobile terminal of a mobile communication device and is a basic component in wireless communication. It plays an important role in the overall performance.

Among these conventional antennas, a dipole is a type in which two dipoles corresponding to a quarter length of the wavelength of the resonance frequency are connected to each other, and have a simple structure, which is easy to manufacture, and also in a wide frequency range. Although there is an advantage that it can be used, it is inconvenient to carry because the length of the dipole antenna is very large.

The helical helical antenna is formed by winding a coil in the form of a spiral coil on a support of an insulating material, and determines the resonant frequency band by adjusting the number, spacing, and length of coils, and the overall length of the dipole antenna. It is small in comparison with easy to carry.

Recently, various types of wireless communication services with different frequency bands such as Code Division Multiple Access (CDMA), Personal Communication Service (PCS), Group Special Mobile (GSM), and Digital European Cordless Telephone (DECT) have been supplied. Although subscribers use them, there is a disadvantage in that they are not compatible between services. Therefore, as a portable terminal, an antenna having a wide bandwidth that can be used in various frequency bands is required.

Antennas used in general mobile terminals are a retractable antenna and a fixed antenna in which a dipole antenna and a helical antenna are combined, and in the case of a retractable antenna, the retractable antenna is flexibly formed at the upper end of the mobile terminal. When the portable terminal is used, it is extended and used, and when not used, it is reduced and carried.

However, since the retractable antenna and the fixed antenna protrude from the upper end of the portable terminal, there is a problem such as breakage, and the portable is also inconvenient, and there is a problem that the volume occupied by the antenna in the portable terminal is too large.

In order to solve this problem, a chip antenna using a ceramic chip manufacturing technology has been developed that can be embedded into a portable terminal.

The conventional ceramic chip antenna is a structure including a helical conductor formed by spirally winding a coil inside a ceramic chip using a chip stacking process, and recently, a step that can be embedded in a portable terminal in the form of a small surface mount device (SMD) However, due to the high reliability and high dielectric constant, radiation efficiency is very low, and is gradually disappearing. Accordingly, a new concept of chip antenna has emerged.

The present invention has been made by the above-described necessity, and an object of the present invention is to increase the design bandwidth and gain in a coupler manner and to mount an antenna on a PCB in order to improve the characteristics and expand the bandwidth while using the FR-4 material. It is to provide a coupler-type embedded chip antenna that can improve characteristics by inducing a secondary coupler using the ground of the PCB.

In order to achieve the above object, the present invention is a dielectric block having a first main surface and a second main surface facing each other and a plurality of side surfaces substantially orthogonal to the first and second main surfaces;

A radiation pattern formed on a portion of the first main surface;

A radiation induction pattern formed on a portion of one side of the plurality of side surfaces to extend with the radiation pattern and serving as the radiation pattern and a radiation element;

A feed point formed to be spaced apart from the radiation pattern by a gap region formed by exposing the dielectric block in a partial region of the other side opposite to the one side to induce a coupler phenomenon when a signal is input; And

It is to provide a coupler type embedded chip antenna formed on the outer side of one of the two outer sides except for one side and the other side and including a ground pile electrically connected to the radiation induction pattern.

The patch pattern may be formed in a portion of the second main surface to be spaced apart from the radiation induction pattern.

In addition, the chip antenna is mounted on the PCB embedded in the communication device in a state in which the second main surface on which the patch pattern is formed is mounted by the SMD to serve as a patch antenna for inducing a secondary coupler together with the ground of the PCB. It is desirable to maximize the utilization of the internal space.

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of a built-in chip antenna according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a bottom and a back surface not shown in FIG. 1.

Embedded chip antenna 20 according to the present invention or a plurality of side surfaces 24a substantially orthogonal to the first and second main surfaces 22a and 22b and the first and second main surfaces 22a and 22b facing each other. And dielectric blocks with 24d).

The dielectric block is FR-4 (Epoxy), a general-purpose product, where FR-4 is a standard of the National Electrical Manufacturers Association (NEMA), and is easily processed using a glass epoxy-based substrate. It is widely used in industrial equipment and the like because it can form a multilayer board due to its low dimensional change and absorbency.

The radiation pattern 30 is formed in a partial region of the first main surface 22a and extends to the radiation induction pattern 32 formed in the partial region of the adjacent one side surface 24a.

The first main surface 22a is processed by a masking operation 34 to protect the gap region where the radiation pattern 30 and the dielectric block are exposed while the radiation pattern 30 is formed in the partial region.

The radiation pattern 30 and the radiation induction pattern 32 serves as a radiating element that induces a coupling signal to radiate.

The reason why the portion where the radiation induction pattern 32 of the one side surface 24a is formed does not have the same plane as the portion where the radiation induction pattern is not formed, that is, the reason why the radiation induction pattern 32 is formed further inward In order to form the copper foil constituting the radiation induction pattern in the manufacturing process to increase the radiation efficiency and reduce the structure.

The width of the first main surface 22a and the radiation pattern 30 of the side where the radiation induction pattern 32 is not formed is narrow, and the width of the first main surface 22a and the radiation pattern 30 of the side where the radiation induction pattern 32 is formed. Is the part affected by the antenna frequency and becomes the induction part of the signal.

On the other side surface 24b of the one side surface 24a on which the radiation induction pattern 32 is formed, a feed point 40 through which a signal of a feed portion is induced is formed as a via hole, and the other side surface 24b. The feed point 40 is separated from the radiation pattern 30 at intervals due to the frequency influence by the gap region where the dielectric block of the first main surface 22a is exposed.

The outer surface 24d of one of the two outer surfaces 24c and 24d except the one side 24a and the other side 24b becomes a ground dummy 42a, and the other outer surface 24c is a power supply dummy. (42b).

The feed pile 42b is electrically connected to the feed point 40, and the radiation pattern 30 is separated by a gap region in which a dielectric block is exposed at intervals according to the frequency influence of the coupling, and the PCB 50 is formed by SMD. ), When equipped with a feed and dummy role.

When the ground dummy 42a is electrically connected to the radiation induction pattern 32 and mounted on the PCB 50 by SMD, the ground dummy 42a functions as a dummy and a radiation element.

That is, the both outer side surfaces 24c and 24d of the chip antenna 20 become the ground and the feed connection portion.

The edge portion where the side and the side face is preferably formed to be round (round) with a drill or the like in the manufacturing process to remove the foreign matter and to suppress the short.

On the other hand, a patch pattern 36 is formed in a portion of the second main surface 22b, and as shown in FIGS. 3A and 3B, the second main surface 22b is mounted on a PCB embedded in a portable terminal or the like. When connected to the ground 52 of the PCB 50 by the SMD in the state, it serves as a patch antenna for inducing a secondary coupler with the ground of the PCB.

Unlike the radiation pattern 30, the patch pattern 36 is formed to be spaced apart from the radiation induction pattern 32, and is fed to the PCB 50 in a gap region where the dielectric block of the second main surface 22b is exposed. Pad 44 is formed.

Like the first main surface, the second main surface 22b is masked 34 to protect the gap region where the patch pattern 36 and the dielectric block are exposed except for the feeding pad 44.

In the above structure, a high frequency signal source is input to the feed point 40 of the other side 24b, and the input high frequency signal source is formed of the feed point 40 and the feed dummy 42b and the first main surface 22a. The ground dummy 42a of the outer surface 24d is led to the radiation induction pattern 32 of the radiation pattern 30 and one side 24a extending to the radiation pattern through the capacitive coupling formed between the radiation patterns 30. Have a flow through it.

In other words, the signal of the feed point 40 is coupled to the radiation pattern 30 and the radiation induction pattern 32 is magnetically guided through the ground dummy 42a to induce the coupling signal to radiate the primary role Will be performed.

3A and 3B are diagrams illustrating secondary coupler induction of an embedded chip antenna according to an exemplary embodiment of the present invention.

FIG. 3A shows that the second main surface 22b having the patch pattern 36 is electrically connected to the PCB 50 by soldering in a state where the chip antenna is mounted so as to contact the PCB 50. FIG. Shows the ground 52 of the back of the PCB (50) on which the chip antenna (20) is mounted.

At this time, the ground portion of the chip antenna 20 is electrically connected to the ground 52 of the PCB 50 so that the patch pattern 36 is connected to the ground 52 and the patch portion by the rear ground area of the PCB 50. Induced car coupler.

That is, when the chip antenna 20 according to the present invention is mounted on the PCB 50, the chip antenna according to the present invention may be used as a patch antenna for inducing a secondary coupler by utilizing the ground 52 of the PCB 50. Can be.

4A and 4B are graphs showing the frequency band and directivity of the embedded chip antenna according to an embodiment of the present invention.

As shown, it can be seen that the frequency band is approximately 1.75-1.99 GHz, with a maximum beam width of -1.26 dB and an angle of -156 ?? at 1.71 GHz.

Also, the maximum beamwidth is 1.60dB at 1.81GHz and the angle is -125 ??, the maximum beamwidth is 1.23dB and the angle is -132 ?? at 1.90GHz, and the maximum beamwidth is 1.71dB at 1.99GHz. And then the angle is -100 ??.

That is, it can be seen that the bandwidth can be expanded more than twice and the gain can be improved.

As described above, the embedded chip antenna according to the present invention induces the primary coupling signal in the embedded chip antenna 20 itself, and also induces the secondary coupling signal by utilizing the ground 52 of the PCB 50. By performing the role of a patch antenna, which can be miniaturized and can be applied to a portable terminal by improving the characteristics of the chip antenna, it can be applied to various embedded applications by varying the frequency.

In addition, the use of chip-type antennas is less than 20% because of the difficulty in improving the characteristics. Thus, more than 70% can be applied to PCS, wireless part, and DMB (Digital Multimedia Broadcasting).

Also, according to the present invention, various frequency antennas and multiband antennas can be developed, and a single antenna can serve as a dual band and other frequency antennas.

As described above, according to the present invention, while using the FR-4 material, the band is expanded by about 2 times or more by the coupler induction method, the gain is improved by the coupler induction and the patch type, and the coupler induction and the ground of the PCB part are improved. Not only the use of the part is easy to use, but also the touch effect of the human body can be reduced.

1 is a perspective view of a built-in chip antenna according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a bottom and a rear surface not shown in FIG. 1.

3A and 3B are diagrams illustrating secondary coupler induction of an embedded chip antenna according to the present invention.

4A and 4B are graphs showing the frequency band and directivity of the embedded chip antenna according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

20: chip antenna 22a, 22b: main surface

24a,... , 24d: side 30: radiation pattern

32: radiation induction pattern 34: masking

36: patch pattern 40: feed point

42a: Ground pile 42b: Feed pile

44: power supply pad 50: PCB (Test Board)

52: Ground

Claims (5)

A dielectric block having a first main surface and a second main surface facing each other and a plurality of side surfaces substantially perpendicular to the first and second main surfaces; A radiation pattern formed on a portion of the first main surface; A radiation induction pattern formed on a portion of one side of the plurality of side surfaces to extend with the radiation pattern and serving as the radiation pattern and a radiation element; A feed point formed to be spaced apart from the radiation pattern by a gap region formed by exposing the dielectric block in a partial region of the other side opposite to the one side to induce a coupler phenomenon when a signal is input; And A coupler type embedded chip antenna including a ground pile formed on an outer surface of one of both outer surfaces except for the one side and the other side and electrically connected to the radiation induction pattern. The coupler type embedded chip antenna of claim 1, wherein a feeding dummy is formed on the other outer surface of both outer sides to be electrically connected to the feeding point and spaced apart from the radiation pattern. The coupler type embedded chip antenna of claim 1 or 2, wherein a patch pattern is formed in a part of the second main surface to be spaced apart from the radiation induction pattern. 4. The patch antenna of claim 3, wherein a chip antenna is mounted by SMD on a PCB embedded in a communication device in a state in which the second main surface on which the patch pattern is formed faces the PCB, and guides the secondary coupler together with the ground of the PCB. Integrated chip antenna of the coupler type, characterized in that performing. 4. The embedded chip antenna of claim 3, wherein the dielectric block is formed of FR-4 material.