KR100905703B1 - Integrated Main Chip Antenna Having a tuning device - Google Patents

Abstract

The present invention relates to an integrated main chip antenna having a tuning element, which can adjust the resonant frequency and bandwidth of a low frequency band (CDMA / GSM) by means of the tuning element and the non-powered radiator, and prints a laminated structure in which multiple current paths are formed. The present invention relates to an integrated main chip antenna having a tuning element that can be miniaturized by a circuit board and can operate in a wider broadband.

Accordingly, the present invention provides a tuning part in which a plurality of tuning rods are formed at a predetermined interval vertically downward on a lower surface of the panel, a first radiator part comprising a first resonator part and a second resonator part below the tuning part, and the first first part. The present invention relates to an integrated main chip antenna having a tuning element including a second radiator portion including a second radiator and a non-powered radiator under the radiator portion.

LCP dielectric, first radiator section, second radiator section, resonant frequency, non-powered radiator

Description

Integrated main chip antenna having a tuning device

The present invention relates to a chip antenna that can be embedded in a CDMA / GSM, GPS / DCS / PCS terminal in the form of a surface mount. In particular, the chip antenna can adjust the resonant frequency and bandwidth of the low frequency band by a tuning element and a non-powered radiator. In addition, the present invention relates to an integrated main chip antenna having a tuning element capable of operating in a wide band as well as miniaturizing a size by a printed circuit board having a multilayer structure manufactured to form a multi-current path.

At present, mobile terminals are required to be miniaturized and lightweight, and various service providing functions are required. In order to satisfy these demands, embedded circuits and components employed in mobile terminals are becoming more multifunctional and gradually miniaturized.

This trend is equally required in antennas, which are one of the main components of mobile terminals.

Commonly used mobile terminal antennas include an external helical antenna, a planar antenna of a built-in planar inverted F antenna (PIFA), and a ceramic chip antenna. have.

The helical antenna is an external antenna fixed to the top of the mobile terminal and used together with the monopole antenna.

In the case where the helical antenna and the monopole antenna are used together, when the antenna is withdrawn from the main body of the mobile terminal, the antenna operates as a monopole antenna and when inserted, the antenna is operated as a λ / 4 helical antenna.

Such an antenna has an advantage of obtaining a high gain, but has a problem in that a specific Absorption Rate (SAR) characteristic, which is a harmful level of electromagnetic waves due to omnidirectionality, is not good.

On the other hand, in order to overcome this disadvantage, a flat antenna or a ceramic chip antenna of a flat inverted-F antenna having a low profile structure is provided.

Since the planar antenna and the ceramic chip antenna of the planar inverted-F antenna are built-in antennas and are configured inside the mobile terminal, the external appearance of the mobile terminal can be designed beautifully and has excellent characteristics against external impact.

The planar antenna and the ceramic chip antenna of the planar inverted-F antenna are developed in the form of a dual-band antenna of a dual radiator for different frequency bands, that is, high frequency and low frequency bands, according to the trend of multifunctionalization.

Although the flat antenna has a merit of being able to be built in, although it is slightly lower than an external antenna in terms of performance, the flat antenna has been continuously developed. It has to be changed, and there is a disadvantage in that the unit cost is high.

FIG. 1A illustrates a built-in antenna of a mobile terminal currently used in the GSM / DCS (824 MHz to 960 MHz, 1710 MHz to 1990 MH) bands. This is a typical flat inverted-F antenna structure in which the outer lines adjust the GSM band (824 MHz to 960 MHz), the inner lines adjust the DCS / PCS band (1710 MHz to 1990 MH), and the distance and slots between the lines. This is a fine tuning method by adjusting the size of the slots.

Referring to FIG. 1A, first, since the size (35x20x6) is large and the unit price is high, it is inferior in competitiveness to continue to use in a mobile phone terminal.

Figure 1b shows a ceramic chip antenna for Bluetooth. In addition, ceramic chip antennas have a small size and good efficiency, but have a narrow bandwidth, which is sensitive to external factors and has a high cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and implements a multi-band characteristic by using a first radiator composed of a first resonator and a second resonator, and at the same time has a tuning element capable of adjusting the resonant frequency and bandwidth. It is an object to provide an integrated main chip antenna.

In addition, the present invention is formed of a laminated printed circuit board, the second radiator portion that emits a signal of a high frequency band (GPS / DCS / PCS) is combined with the first radiator portion can be miniaturized as a whole and can be operated in a wide band It is molded with an LCP (Liquid Crystal Polymer) dielectric and is surface mounted technology (SMT) on the main board inside the terminal, thereby preventing the antenna deformation and providing an integrated main chip antenna with reliable tuning elements. There is another purpose.

In order to achieve the above object, an integrated main chip antenna having a tuning element according to an embodiment of the present invention includes a tuning unit in which a plurality of tuning rods are formed at regular intervals in a row vertically downward on a lower surface of a panel, and the tuning unit And a first radiator portion having a first resonator portion and a second resonator portion at a lower portion thereof, and a second radiator portion having a second radiator and a non-feeding radiator under the first radiator portion.

As described above, the present invention provides a combination of the first radiator portion and the second radiator portion formed on the multilayer printed circuit board, thereby miniaturizing the size, as well as the current flow generated in the coupling form of the first radiator portion and the second radiator portion. Due to the multiplexing of paths, it has excellent broadband characteristics.

In addition, the resonant frequency and the bandwidth can be adjusted by the tuning element and the non-powered radiator, and are integrally molded with an LCP dielectric to be surface mounted on the main board inside the terminal, thereby simplifying the installation and providing excellent reliability.

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

Figure 2a is a schematic diagram showing the overall configuration of the integrated main chip antenna having a tuning element according to an embodiment of the present invention, Figure 2b schematically shows an exploded perspective view and assembled state of the integrated main chip antenna according to Figure 2a The figure shown.

As shown in FIG. 2B, in the integrated main chip antenna 10 having the tuning element according to the present invention, the tuning unit 100, the first radiator unit 200, and the second radiator unit 300 are downward from above. It is a structure arranged sequentially.

The integrated main chip antenna 10 having a tuning element formed by sequentially arranging the tuning unit 100, the first radiator unit 200, and the second radiator unit 300 is integrally molded with an LCP dielectric to have a small size. A surface mount chip antenna is formed.

The tuning unit 100 includes a plurality of tuning rods 112 that are tuning elements, and the first radiator unit 200 includes a first resonator unit 220 and a second resonator unit 240. The second radiator 300 includes a second radiator 320 and a non-powered radiator 340.

As shown in FIG. 2B, the tuning unit 100 is formed of a plurality of tuning rods 112 arranged at regular intervals vertically downward on the bottom surface of the panel 110, and below the tuning unit 100. Spaces formed by the meander line structure in which the second resonator portion 240 constituting the first radiator portion 200 positioned in the continuous form of a meandering line form the meander line structure The tuning rod 112 is inserted therebetween.

The tuning rods 112 are a plurality of non-powered elements formed to be electrically coupled with the second resonator 240, and have a cylindrical shape having a predetermined length and diameter.

Therefore, the resonance frequency and bandwidth of the low frequency band (CDMA / GSM) can be adjusted by adjusting the length, diameter, and spacing of the tuning rods 112.

3A is a perspective view of the first radiator unit according to FIG. 2B, and FIGS. 3B, 3C and 3D are plan views, left and right side views according to FIG. 3A, and show detailed views of a plurality of terminals.

The first radiator 200 is positioned below the tuning unit 100, and is different from the first resonator 220 and the first resonator 220 that resonate in a high frequency band (GPS / DCS / PCS). It consists of a second resonator 240 connected by an And line structure and the first resonator 220 and the second resonator 240 is resonated in the low frequency band by the total length formed by interconnecting. At this time, the total length formed by connecting the first resonator 220 and the second resonator 240 is longer than the length of the first resonator 220.

Since the structure of the first radiator unit 200 is a structure that can implement two frequency bands of the low frequency band and the high frequency band by the first resonator 220 and the second resonator 240, the first By reducing the lengths of the resonator 220 and the second resonator 240, the overall size of the chip antenna can be reduced.

'의 형태로, 상기 제 1 방사체부(200)의 상면 양단에서 상기 제 2 방사체부(300) 방향으로 절곡하고, 절곡된 양측면의 하단을 각각 대향하도록 절곡함으로써 복수개의 단자가 형성된다.The first radiator portion 200 is viewed in the width direction '

In the form of ', a plurality of terminals are formed by bending in the direction of the second radiator portion 300 at both ends of the upper surface of the first radiator portion 200, and bent to face the lower ends of the bent both sides.

A discontinuous point A is formed at an intermediate portion of one side of both side surfaces of the first radiator 200, and the first resonator 220 and the second resonator 240 are formed around the discontinuous point A. ) Is formed.

The first resonator 220 has a feed terminal 201 and a ground terminal 202 formed at one end of the first radiator 200 with respect to the discontinuous point A, and the second The resonator 240 has a fixed terminal 203 formed at the other end of the first radiator 220.

The feed terminal 201 and the ground terminal 202 are directly connected to the feed pad 326 and the ground pad 327 of the second radiator 320 constituting the second radiator portion 300 so that the first radiator The unit 200 is supplied with power, and the fixed terminal 203 is directly connected to the fixed pad 342 of the non-powered radiator 340 constituting the second radiator 300 so that the non-powered radiator 340 is provided. It is fixed to the second resonator 240.

In more detail, the first resonator 220 has a part of the upper surface of the first resonator 220 and one side of both sides of the first resonator unit 220 having only a portion of the meander line, and the other side of the first resonator unit 220 continuously. As a result, not only the power supply terminal 201 and the ground terminal 202 but also some of the plurality of terminals formed in the first radiator 200 may be configured.

 Here, some of the plurality of terminals formed in the first radiator portion 200 are connection terminals 221 and 221-1 directly connected to the second radiator 320 constituting the second radiator portion 300. It is connected to the second radiator and has a broadband characteristic.

The feed terminal 201 and the ground terminal 202 are directly connected to the feed pad 326 and the ground pad 327 of the second radiator 320 constituting the second radiator 300, and the connection terminal Reference numerals 221 and 221-1 are directly connected to the fixing pads 329 and 329-1 of the second radiator 320 constituting the second radiator 300.

The second resonator 240 has an upper surface and both sides of the second resonator 240 in the form of meander lines, and includes a plurality of terminals formed on the first radiator 200 as well as the fixed terminal 203. Including some of them.

Here, some of the plurality of terminals formed in the first radiator 200 except for the fixed terminal 203 are another fixed terminal 241 and the second tuning connection terminal 242.

The fixed terminal 203 is directly connected to the fixed pad 342 of the non-powered radiator 340 constituting the second radiator portion 300, and the another fixed terminal 241 is the non-powered radiator 320. The non-powered radiator 340 is directly connected to the second resonator 240 by another fixing pad 343 directly connected to the second resonator 240 by the fixing terminal 230 and the other fixing terminal 241. do.

 In addition, the second tuning connection terminal 242 is a connection terminal formed at a discontinuous point on the other side of the second resonator 240 facing the discontinuous point A formed on one side of the first radiator 200. As a result, the first tuning element 344 substantially constitutes the non-powered radiator 340 and is formed of a non-powered element having a predetermined pattern including a slot 344-1 to adjust the resonance frequency and the bandwidth of the low frequency band. It is directly connected to the point B of the second tuning element 345 formed in a predetermined connection pattern which is electrically coupled at a predetermined interval.

4A is an exploded perspective view of the second radiator part according to FIG. 2B, and FIGS. 4B and 4C show a plan view and a side view according to FIG. 4A.

The second radiator 300 is a laminated structured printed circuit board formed of four layers positioned below the first radiator 200, and the second radiator 320 and the non-powered radiator are formed on the printed circuit board. 340 is formed.

The second radiator 320 is directly connected to the first resonator 220 constituting the first radiator 200 to radiate a signal of a high frequency band, and is formed at one end of the multilayered printed circuit board. It demonstrates in detail for each layer (FIG. 4C).

A power feeding pattern 321 and a ground pattern 322 are formed on a first layer to be surface-mounted on a main board inside the terminal, and a first resonator 220 constituting the first radiator 200 is formed on a second layer. The bar-shaped line patterns 323 and 324 having two predetermined lengths extending in the longitudinal direction corresponding to the lengths of the rod-shaped line patterns 323 and 324 are spaced apart from each other at predetermined intervals and formed in parallel. A bar-shaped line pattern 325 having the same shape as) is formed.

A plurality of fixing pads 328, 329, and 329-1, a power feeding pad 326, and a ground pad 327 are formed in the fourth layer.

The fixing pad 328 of the fourth layer is electrically connected to the rod-shaped line patterns 323, 324, and 325 formed in the second and third layers by the through hole 330, and the fixing pad 328 is further formed in the second and third layers. 329 and 329-1 are electrically coupled to the fixing pad 328, and the feed pad 326 and the ground pad 327 are formed in the first layer by the through hole 330. The pattern 321 and the ground pattern 322 are electrically connected to each other.

The fixing pads 329 and 329-1 are directly connected to the plurality of connection terminals 221 and 221-1 of the first resonator 220 forming the first radiator 200 to have a broadband characteristic. (FIG. 4B).

Here, the second radiator 320 forms a frequency of a high frequency band, and is wideband due to the multiplexing of the current flow formed in the bar line patterns 323, 324, and 325 formed on different layers of each of the multilayered printed circuit boards. Has characteristics.

In this case, the multiplexed current flow formed by the bar-shaped line patterns 323, 324, and 325 may have the same effect on the fixing pad 328 electrically connected by the through hole 330. The fixing pads 329 and 329-1, which are electrically connected to the 328, are directly connected to the plurality of terminals 221 and 221-1 of the first resonator 220 to have broadband characteristics. .

In addition, the non-powered radiator 340 includes a first tuning element 344 substantially configured of the non-powered radiator 340 and formed of a non-powered element having a predetermined pattern including the slot 344-1. It is electrically coupled with the second resonator 240 of the first radiator unit 200 by a predetermined pattern to adjust the resonant frequency and bandwidth of the low frequency band, and is formed on the other end of the laminated structured printed circuit board, It demonstrates in detail for each layer (FIG. 4C).

A fixing pattern 341 is formed on the first layer, which is the same layer on which the feed pattern 312 and the ground pattern 322 of the second radiator 320 are formed, and a plurality of fixing pads of the second radiator 320 ( 328, 329, 329-1, a predetermined form including a plurality of fixing pads 342, 343, and slots 344-1 in the fourth layer, which is the same layer on which the feeding pad 326 and the ground pad 327 are formed. The first tuning element 344 is formed in a pattern of and a predetermined distance that is maintained at a distance from the first tuning element 344 and is connected to the second tuning connection terminal 242 of the second resonator 240 A second tuning element 345 is formed in the connection pattern of the.

Here, the another fixing pad 343 and the first tuning element 344 are formed together at a position spaced a predetermined distance from the fixing pad 342 formed in the fourth layer, the another fixing pad 343 And a second tuning element 345 formed at a position spaced apart from the first tuning element 344 by a predetermined distance so that the fixing pad 342 and the another fixing pad 343 are the non-powered radiator 340. It serves to support and secure the second resonator 240, and the first tuning element 344 and the second tuning element 345 forms a structure electrically coupled with each other.

The fixing pattern 341 formed on the first layer is surface mounted on a main board inside the mobile terminal, and the fixing pad 342 formed on the fourth layer has a second resonance constituting the first radiator 200. Directly connected to the fixed terminal 203 of the unit 240, the another fixed pad 343 is another fixed terminal 241 of the second resonator unit 240 constituting the first radiator portion 200 Directly connected to the second resonator 240 to the fixed-free radiator 340 is supported.

The first tuning element 344 adjusts the resonant frequency and bandwidth for the low frequency band by changing the width and length of the slot 344-1.

In addition, the second tuning element 345 which is spaced apart from the first tuning element 344 by a predetermined interval and electrically coupled to the first tuning element 344 is a point B of the second tuning element 345. And a connection pattern of a predetermined type directly connected to the second tuning connection terminal 242 of the second resonator 240, and as a result, the first pattern of the non-powered radiator 340 by the predetermined pattern. Since the tuning element 344 and the second resonator 240 are electrically coupled to each other, the resonant frequency and bandwidth for the low frequency band are varied by changing the width and length of the C point of the second tuning element 345. Adjust it.

Therefore, the non-powered radiator 340 includes a first tuning element 344 formed of a non-powered element having a predetermined pattern including the slot 344-1 to constitute the first radiator portion 200. Since a predetermined structure is electrically coupled with the resonator 240 by a pattern, the width and length of the slot 344-1 of the first tuning element 344 and the second tuning element 345 are formed. By adjusting the coupling amount by adjusting the, the resonant frequency and bandwidth for the low frequency band is adjusted.

In addition, the second radiator 300 may be configured in the laminated structured printed circuit board, and at the same time, compared with the printed circuit board, the LTCC may have a smaller size and improved characteristics, and a cost reduction and reliability may be improved. It can also be configured as a (Low Temperature Co-fired Ceramic) type.

The tuning part 100, the first radiator part 200, and the second radiator part 300 are molded in an LCP dielectric to form a chip antenna.

The LCP dielectric uses E6808 with dielectric constant of 3.5 and E4205L with 2.8 to reduce the size of the antenna by slightly reducing the wavelength of the frequency of use, and to prevent the deformation of the antenna when surface-mounted due to thermal characteristics of over 300 degrees Celsius. . Approximately 100 to 150 MHz of frequency shifts depending on the presence of the LCP dielectric.

5 shows a VSWR characteristic diagram of an integrated main chip antenna having a tuning element having a tuning element according to an embodiment of the present invention.

As shown in FIG. 5, the VSWR is better than the conventional antenna, and in terms of bandwidth, a bandwidth of about 10% (80 MHz or more) in the low frequency band and about 34% (600 MHz) or more in the high frequency band is secured (reference standing wave). The ratio is VSWR <3: 1).

As described above, the present invention is a surface mount type, easy to fasten, downsized in size, and at the same time good broadband characteristics compared to size.

The present invention has been described in detail so far, but the embodiments mentioned in the process are only illustrative and are not intended to be limiting, and the present invention is provided by the following claims. Within the scope not departing from the scope of the present invention, changes in the components that can be coped evenly will fall within the scope of the present invention.

1A and 1B schematically illustrate an example of a planar antenna and a ceramic chip antenna according to the related art.

FIG. 2A schematically illustrates an overall configuration diagram of an integrated main chip antenna having a tuning device according to an exemplary embodiment of the present invention. FIG.

2b schematically illustrates an exploded perspective view and an assembled state of an integrated main chip antenna having a tuning element according to FIG. 2a;

3A to 3D are perspective views, plan views, and left and right side views specifically showing the first radiator part according to FIG. 2B.

4A to 4C are a perspective view, a plan view, and a side view specifically showing a second radiator part according to FIG. 2B;

5 is a VSWR characteristic diagram of an integrated main chip antenna having a tuning element according to an exemplary embodiment of the present invention.

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

10: integrated main chip antenna having a tuning element

100: tuning unit 200: first radiator

300: second radiator section

220: first resonator 240: second resonator

320: second radiator 340: non-powered radiator

201: Feeding terminal 202: Grounding terminal

321: Feeding pattern 322: Grounding pattern

326: feeding pad 327: ground pad

203, 241: fixed terminal 341: fixed pattern

342, 343, 328, 329, 329-1: fixing pad

242: first tuning coupling terminal 221, 221-1: connecting terminal

344: first tuning element (slot) 345: second tuning element

323, 324, 325: bar-shaped line pattern 330: through hole

Claims (15)

A tuning part in which a plurality of tuning rods are formed at a predetermined interval downwardly on the bottom surface of the panel; A first radiator positioned under the tuning unit, the first radiator comprising a first resonator and a second resonator connected to the first resonator; An integrated main chip antenna having a tuning element, which is located below the first radiator and comprises a second radiator comprising a second radiator and a non-powered radiator. The method of claim 1, wherein the tuning portion, the first radiator portion and the second radiator portion, An integrated main chip antenna having a tuning element, characterized in that integrally molded by the LCP dielectric. The method of claim 1, wherein the tuning rods, An integrated main chip antenna having a tuning element, characterized in that the cylindrical shape having a constant length and diameter. The method of claim 3, wherein the tuning rods, The tuning rod is inserted between the spaces created by the continuous meander line of the second resonator, and electrically coupled with the second resonator to control the length, diameter, and spacing of the tuning rod to adjust the low frequency band. An integrated main chip antenna having a tuning element, characterized in that the resonant frequency and bandwidth are adjusted. The method of claim 1, wherein the first radiator portion, In the width direction,

And a plurality of terminals are formed by bending in the direction of the second radiator portion at both ends of the upper surface of the first radiator portion and bending the lower ends of the bent both sides to face each other. Chip antenna. The method of claim 5, wherein A discontinuous point is formed at an intermediate portion of one side of both side surfaces of the first radiator part, and the first resonator part and the second resonator part are formed around the discontinuous point, and the first resonator part is formed around the discontinuous point. A feed terminal and a ground terminal are formed at one end of the first radiator, and the second resonator is a fixed main terminal having a tuning element formed at the other end of the first radiator. The method of claim 6, wherein the first resonator, Only a part of the upper surface of the first resonator and a part of one side of the two sides are continuous meander line shape, the other side is a continuous meander line shape as a whole, the first resonator and the second resonator are formed interconnected The total length of the integrated main chip antenna having a tuning element, characterized in that formed longer than the length of the first resonator. The method of claim 6, wherein the first resonator, And a part of a plurality of terminals formed in the first radiator unit, wherein a part of the plurality of terminals and the second radiator are directly connected to each other to have a broadband characteristic. The method of claim 6, The second resonator includes a part of a plurality of terminals formed on the first radiator to have a meander line structure in which upper and both sides of the second resonator are continuous. Some of the plurality of terminals formed in the first radiator portion and included in the second resonator portion include a plurality of fixed terminals formed in the first radiator portion; The non-powered radiator includes a first tuning element and a plurality of fixing pads formed of a non-powered element having a predetermined pattern; A plurality of fixed terminals formed on the first radiator and included in the second resonator to be directly connected to a plurality of fixing pads included in the unpaid radiator to support and fix the unpaid radiator; Integrated main chip antenna with elements. The method of claim 6, The non-powered radiator is a first tuning element formed of a non-powered element having a predetermined pattern and a second spaced apart from the first tuning element at a predetermined interval and electromagnetically coupled to the first tuning element and formed of a predetermined connection pattern. Including a tuning element; And the second resonator is provided with a second tuning connector directly connected to a predetermined position of the second tuning element in order to adjust the resonant frequency and bandwidth of the low frequency band. The method of claim 1, wherein the second radiator portion, An integrated main chip antenna having a tuning element, wherein the second radiator and the non-powered radiator are formed on the printed circuit board. The method of claim 1, wherein the second radiator portion, An integrated main chip antenna having a tuning element, which can be configured as an LTCC. The method of claim 11, wherein the second radiator, And a bar-shaped line pattern having at least two predetermined lengths in the longitudinal direction of the first resonator, and arranged in parallel to be spaced apart from each other by a predetermined distance. The method of claim 13, wherein the bar-shaped line pattern, The integrated main chip having the tuning element is formed on the printed circuit board of the laminated structure so as to be positioned on different layers, and the fixing pad is widened by electrically connecting the rod-shaped line pattern through the through hole. antenna. The method of claim 11, wherein the non-powered radiator, A first tuning element formed of a non-powered element of a predetermined pattern including a slot for adjusting the resonant frequency and bandwidth of the low frequency band, and a second tuning element that is electrically spaced apart from the first tuning element at a predetermined interval. And the second tuning element has a predetermined connection pattern directly connected to the second tuning connection terminal of the second resonator unit.

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