KR101516418B1 - A Tuneable Antenna System using the Tuneable coupling Antenna - Google Patents

Abstract

The present invention relates to a tunable antenna system using a tunable coupling antenna for a portable terminal which comprises: a connection pattern unit provided with a feeding pattern connected to a feeding line which feeds an RF signal; a first ground pattern wherein the RF signal is connected to a ground unit by one end thereof and a tunable matching unit having a tunable switch is connected to the other end thereof; and a second ground pattern connected to the ground unit. According to an embodiment of the present invention, the tunable coupling antenna comprises a coupling region formed in an inter-digit pattern and electromagnetically mounted between a main conductive member connected to a feeding pad of the connection pattern unit and a first conductive member connected to the first ground pattern of the connection pattern unit. The tunable antenna system according to the present invention compensates for a chip element value used to connect to a switching element to shift a resonant frequency by inductance and capacitance components caused by coupling from the inter-digit pattern to easily move the frequency compared to a convention antenna with fewer chip elements when shifting the frequency to a specific band, and reduce costs by using fewer chip elements and improve efficiency.

Description

[0001] The present invention relates to a tunable antenna system using a tunable coupling antenna,

The present invention relates to a tunable antenna system using a tunable coupling antenna having a connection pattern portion of a tunable circuit board portion and a connection pad connected thereto in a tunable antenna system provided inside a portable terminal. More particularly, the present invention relates to a method and apparatus for switching a resonant frequency in a tunable antenna system by an inductance or a capacitance component generated by forming a coupling line electromagnetically coupled in a wide length range in an interdigitated pattern in a conductive pattern region of a tunable coupling antenna Since the value of the chip element connected to the tunable switch is compensated, deterioration of the antenna efficiency due to the loss value of the element can be minimized, and a tunable coupling antenna To a tunable antenna system using the same.

BACKGROUND ART [0002] Recently, with the development of communication technology at a very high speed, communication devices have been made smaller, lighter, and have higher performance.

In particular, a considerable number of smartphones are rapidly evolving into the fourth generation of LTE (Long Term Evolution) communication methods in the existing second and third generation communication systems such as GSM, CDMA and WCDMA, while Bluetooth, Global Positioning System (GPS) , WIFI, and so on.

However, since it is difficult to mount a plurality of antennas due to the limited size of the terminal, a single antenna covers multiple bands Broadband antenna technology that can be operated is being developed, and broadband antenna technology has been proposed as a way to support a frequency band for various communication without designing a tuning antenna with a wide bandwidth.

However, since it is difficult to implement the multi-band based on a wide bandwidth and simultaneously increase the efficiency in all the resonance frequency bands, it takes a lot of time and effort to design the antenna.

Therefore, a tunable antenna system capable of tuning the resonance frequency of the antenna according to the type of communication band used to improve the problem is used. The basic operation principle of the tunable antenna system is to design an antenna having a dual resonant band operating in a high frequency band and a low frequency band, and then, by designing an inductance or a capacitance value connected to the switching device, the desired third and fourth communication bands And the resonance frequency of the antenna is changed. With this method, a mobile communication terminal must be able to support various communication bands with one antenna, and high efficiency should be ensured for each resonance frequency.

However, a switching device, which is essentially used in a tunable antenna system, has a high loss in itself, and in order to change a resonance frequency to a low frequency band, a chip device having a high inductance value or a high capacitance value must be additionally used Therefore, the loss value due to the additional elements to be used becomes very large, so that the antenna efficiency is rapidly deteriorated at low frequencies below a certain low frequency band.

Therefore, in the tunable antenna system, an optimized antenna designing technique without a deterioration of the antenna efficiency due to the loss of the element is required in a specific frequency band in which the resonance frequency transition is easy due to a low inductance value or a low capacitance value. It is a situation that is required.

[Patent Document] JP 10-1087926 Nov. 28, 2011, page 6 Identification Numbers [0013] ~ 8 Identification Numbers [0027] Figures 1 and 2

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide a tunable antenna system having a tunerable antenna having a connection pad connected to a connection pattern portion of a tunable circuit board portion, The present invention relates to a tunable antenna system using a coupling antenna, and more particularly to a tunable antenna system using a tunable coupling antenna

Connected to a tunable switch that is additionally used for resonant frequency transitions in a tunable antenna system due to inductance or capacitance components generated by coupling lines that are electromagnetically coupled in a wide length range in an interdigitated pattern in a conductive pattern region of the tunable antenna system The inductance or the capacitance value of the chip element to be compensated for is reduced. Therefore, it is an object of the present invention to provide a tunable antenna system capable of minimizing efficiency deterioration due to a loss value of a device, do.

It is another object of the present invention to provide a tunable antenna system using a tunable coupling antenna, in which a tuner coupling antenna is used for a resonant frequency transition by an inductance or a capacitance component generated by coupling coupling, The present invention aims at providing a tunable antenna system in which the value of a chip element connected to a switch can be compensated for, and frequency shift to a specific band is facilitated compared to a conventional antenna, and the efficiency is improved.

According to an aspect of the present invention, there is provided a tunable antenna system using a tunable coupling antenna. The tunable antenna system includes a feed pattern to which a feed line for feeding an RF signal is connected, a tunable matched And a connection pattern portion formed by a second ground pattern connected to a ground portion for grounding the RF signal; A main conductive member formed of a polymeric synthetic resin film and mounted on the antenna frame and connected to the feeding pattern of the connection pattern portion formed on the antenna frame; and a conductive pattern formed on the antenna frame, And a tunable coupler antenna formed on the tunable circuit board portion and formed of a second conductive member formed on the antenna frame and connected to a second ground pattern of the connection pattern portion, .

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, the main conductive member of the tunable coupling antenna includes: A first pattern unit extending in a direction perpendicular to an upper surface of the antenna frame and a first finger set having a predetermined length in a pattern unit connected to the first pattern unit and extending in a first direction perpendicular to the first pattern unit Wherein the first conductive member of the tunable coupling antenna comprises: A fourth pattern portion formed on an upper surface of the antenna frame at a side of the first pattern portion in parallel to the first pattern portion of the main conductive member to have a length less than the first pattern portion of the main conductive member, A coupling line which is connected to the first pattern unit and is electromagnetically coupled in an interdigitated pattern in correspondence with the first finger set formed on the second pattern unit of the main conductive member in a pattern part extending in a first direction perpendicular to the fourth pattern unit, A fifth pattern portion having a second finger set formed thereon and an extended pattern portion extending from a fifth pattern portion in a second direction opposite to the first direction of the fifth pattern portion, The second conductive member of the coupling antenna comprises: A seventh pattern portion formed on the upper surface of the antenna frame to have the same length as the fourth pattern portion of the first conductive member on the other side of the first pattern portion in parallel with the first pattern portion of the main conductive member, And an eighth pattern portion connected to the pattern portion and formed in a predetermined length in a second direction which is a vertical direction opposite to the fifth pattern portion.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, the main conductive member includes: A third pattern portion connected to the first pattern portion and extending in a direction opposite to a vertical direction of the first pattern portion, the third pattern portion being formed on a side surface of the antenna frame and a lower surface of the antenna frame, A feed pad connected to the tunable circuit board part is further formed and connected to the feed pattern of the connection pattern part in the tunable circuit board part, A sixth pattern portion connected to the fourth pattern portion and extending in a direction opposite to a vertical direction of the fourth pattern portion and extending from a side surface of the antenna frame to a lower surface of the antenna frame, And a second grounding pad connected to the second grounding pad, wherein the first grounding pad is connected to the first grounding pattern of the connection pattern portion in the tunable circuit board portion, A ninth pattern portion connected to the seventh pattern portion and extending from a side surface of the antenna frame and a lower surface of the antenna frame in a direction opposite to a vertical direction of the seventh pattern portion; And a second ground pad connected to the first ground pattern of the tunable circuit board portion is connected to the second ground pattern of the connection pattern portion.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, a tunable matched part of the tunable circuit board part includes N × 1 A tunable switch, N matching pattern parts connected to the Nx1 tunable switch, N chip devices connected to each of the N matching pattern parts, and one end of the N chip devices are connected in series And the other end is composed of a ground connection pattern part connected to the ground part.

According to an aspect of the present invention, there is provided a tunable antenna system using a tunable coupling antenna, the tunable coupling antenna including the main conductive member, the first conductive member, and the second conductive member, And a second resonance band formed of a first frequency band and a second frequency band.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, the first frequency band is 1710 MHz to 2170 MHz and the second frequency band is 880 MHz to 960 MHz do.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, a tunable coupling antenna comprising the main conductive member, the first conductive member, Coupled to the connection pattern portion of the tunable circuit board portion including the tunable matching portion, is electromagnetically coupled in a wide-length range in an interdigitated pattern formed between the main conductive member and the first conductive member of the tunable- The tunable switch compensated for by the inductance component or the capacitance component generated by the coupling line changes the third frequency band to the Nth frequency band including the second frequency band except for the second frequency band, Frequency band and the first frequency band.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, when an RF signal is applied to a main conductive member of the tunable coupling antenna, An RF signal is applied as coupling coupling to the first conductive member through an interdigitated pattern that is a coupling line that is electromagnetically coupled, and the first conductive member is coupled to the main conductive member of the tunable- The first ground pad of the tunable circuit board portion is electrically connected to the first ground pattern of the connection pattern portion of the tunable circuit board portion and the tunable switch of the tunable matching portion connected to the first ground pattern of the connection pattern portion is operated, When any one of the N chip devices is selected and switched, the selected chip device including the second frequency band And the first frequency band is switched to any one of the third to Nth frequency bands and the first frequency band.

In the tunable antenna system using the tunable coupling antenna according to an embodiment of the present invention, the third frequency band of the shifted third to Nth frequency bands is 824 MHz to 894 MHz, And the fourth frequency band is 704 MHz to 746 MHz.

According to an aspect of the present invention, there is provided a tunable antenna system using a tunable coupling antenna, including: a ground connection pattern part connected to a ground part; and a ground connection pattern part connected in series to the ground connection pattern part, A tunable matching unit comprising an N × 1 tunable switch connected to one of the chip elements; A first ground pattern connected to a tunable switch of the tunable matching unit, a power feed pattern connected to a feed line for feeding an RF signal, and a second ground pattern connected to a ground for grounding the RF signal, A connection pattern portion on which the coupling antenna is mounted; And a tunable coupler antenna mounted on a connection pattern portion of the tunable circuit board portion includes a first conductive member connected to a first ground pattern of the connection pattern portion; A main conductive member connected to the feeding pattern of the connection pattern portion; A second conductive member connected to the second ground pattern of the connection pattern portion; And a coupling line that is electromagnetically coupled to the main conductive member and the first conductive member in an interdigitated pattern of a predetermined length is formed.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, when an RF signal is applied to a main conductive member of the tunable coupling antenna, An RF signal is applied to the first conductive member through an interdigitated pattern in a coupled manner and a first ground pad of a first conductive member, which is coupled to the main conductive member of the tunable- The resonance frequency of the applied RF signal is switched by the tunable switch of the tunable matching unit connected to the first ground pattern of the connection pattern unit and connected to the first ground pattern of the connection pattern unit, .

According to an aspect of the present invention, there is provided a tunable antenna system using a tunable coupling antenna, wherein the tunable coupling antenna includes a dual resonant band Is formed.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, when an RF signal is applied to a main conductive member of the tunable coupling antenna, And a tunable switch of the tunable matching unit selects one of the N chip elements to be selected by an RF signal coupling to the first conductive member through an interdigitated pattern coupled to a coupling line, The first conductive member coupled to the main conductive member of the tunable coupling antenna is electrically connected to the first ground pattern of the connection pattern portion to electrically connect the first conductive pattern to the first conductive pattern, The second frequency band is shifted to a frequency band other than the first frequency band and the third frequency band is shifted to a frequency band other than the second frequency band, It characterized in that the operation in the dual band resonance is formed.

According to an aspect of the present invention, there is provided a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention. The tunable coupling antenna is mounted on the tunable circuit board, And the second frequency band corresponding to one of the N chip devices compensated for the inductance component or the capacitance component generated by the coupling line that is electromagnetically coupled with the interdigit pattern, And a second resonant band formed of a first frequency band and a third frequency band shifted to a frequency band other than the second frequency band.

In order to achieve the above object, in a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention, the first frequency band is 1710 MHz to 2170 MHz, the second frequency band is 880 MHz to 960 MHz, The third frequency band of the third to Nth frequency bands is 824 MHz to 894 MHz, and the fourth frequency band is 704 MHz to 746 MHz.

According to the present invention, as described above, in the tunable antenna system using the tunable coupling antenna of the present invention, the tunable coupling antenna has a first frequency band of 1710 MHz to 2170 MHz, a second frequency band of 880 MHz- 960 MHz and the tunable coupler antenna is mounted on the tunable circuit board portion of the tunable antenna system, it is possible to operate in any one of the frequency bands from the second frequency band to the N-th frequency band, According to the preferred embodiment of the present invention, it is possible to operate up to a communication band of 824 MHz to 894 MHz, which is the third frequency band, and a communication band of 704 MHz to 746 MHz, which is the fourth frequency band. In the conductive pattern region of the tunable coupling antenna, A coupling line which is electromagnetically coupled in a wide length range is formed and the inductance or capacitance component generated thereby generates a tunable antenna system Since the value of the chip element connected to the tunable switch for switching the resonance frequency is compensated, even if a chip element having a lower inductance or capacitance value is used, the resonance frequency shift becomes easier and the efficiency deterioration due to the loss value of the element It is possible to achieve a more efficient efficiency because it can be reduced as much as possible and it is possible to obtain a cost saving effect by using a chip element with a small value and also to obtain a resonance frequency of the resonance frequency due to inductance or capacitance component generated by coupling coupling in a conductive pattern A tunable antenna system using an improved tunable coupling antenna is provided in which the value of a chip element connected to a tunable switch used for a transition is compensated to make a frequency transition to a specific band easier than a conventional antenna. .

1A is a view showing a circuit board structure in which a tunable coupling antenna is mounted in the tunable antenna system of the present invention.
1B is a diagram showing an equivalent circuit of the tunable matching unit in the tunable antenna system of the present invention.
2A is a plan view of a tunable coupling antenna used in a tunable antenna system according to an embodiment of the present invention.
2B is a perspective view showing that a tunable coupling antenna is mounted on the tunable circuit board portion of the tunable antenna system of the present invention.
3A is a plan view of a general antenna mounted on the tunable antenna system of the present invention.
3B is a perspective view showing that a general antenna is mounted on the tunable circuit board portion of the tunable antenna system of the present invention.
4A is a diagram showing VSWR when a general antenna is mounted on the tunable antenna system of the present invention.
4B is a diagram showing VSWR when a tunable coupling antenna is mounted on the tunable antenna system of the present invention.
FIG. 5 is a diagram showing antenna gain when a tunable coupling antenna is mounted on a tunable antenna system of the present invention and when a general antenna is mounted. FIG.

Hereinafter, a tunable antenna system using a tunable coupling antenna according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments.

The term used in the specification of the present invention selects the general term that is widely used in the present invention while considering the function of the present invention, but it may be changed depending on the intention or custom of the technician engaged in the field or appearance of new technology . Also, in certain cases, there may be a term chosen arbitrarily by the applicant, in which case the meaning thereof will be described in the description of the corresponding invention. Therefore, it is intended that the terminology used herein should be interpreted based on the meaning of the term rather than on the name of the term, and on the entire contents of the specification. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment.

It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention.

The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

[Preferred embodiments of the present invention]

Hereinafter, preferred embodiments of a tunable antenna system using a tunable coupling antenna will be described in detail with reference to the accompanying drawings.

FIG. 1A is a diagram showing a circuit board structure in which a tunable coupling antenna is mounted in a tunable antenna system of the present invention, and FIG. 1B is a diagram showing an equivalent circuit of a tunable matching unit in the tunable antenna system of the present invention.

As shown in the figure, a tunable circuit board portion 100 on which a tunable coupling antenna 300 for a tunable antenna system is mounted is composed of a connection pattern portion 110 and a tunable matching portion 120.

The connection pattern unit 110 of the tunable circuit board unit 100 includes two first and second ground pads 112 and 113 for electrical connection with the tunable coupling antenna 300 of FIG. The first ground pad 112 is electrically connected to one end of the tunable switch 121 in the tunable matching unit 120 so that the resonance frequency by the tunable switching And is connected to one of the N chip devices 123 to be shifted.

The tunable matching unit 120 of the tunable circuit board unit 100 includes an N × 1 tunable switch 121 connected to the first ground pad 112 and a N × 1 tunable switch 121, N matching pattern units 122 are connected to each of the N matching pattern units 122 and N chip devices 123 are connected to each of the N matching pattern units 122, And the other end is composed of a ground connection pattern part 124 connected to the ground part, and the ground connection pattern part 124 is connected to the ground part 125 through a via hole.

At this time, the other end of the Nx1 tunable switch 121 is connected to the N chip devices 123 provided in the tunable matching unit 120 for switching to a frequency operated in a communication frequency band to be used, An electrical connection is made with any one of the chip elements. The N × 1 tunable switch 121 may be a general varactor diode and a tunable switch IC.

More specifically, the N chip elements 123 of the tunable matching unit 120 in the tunable circuit board unit 100 are RF1 151, RF2 152, and RF3 When any of the chip elements of the tunable coupler 153 to the RFN 154 is selectively switched and electrically connected through the tunable switch 121, (RF1) 151, RF2 152, RF3 153, and RFN 154, which are selectively switched to the tunable switch 121 of the tunable switch 121, do.

Therefore, it can be seen that the tunable antenna system according to the above-described operation principle is configured such that the movement or the transition of the resonance frequency is dependent on the value of the connected chip element selectively switched through the tunable switch 121. [

FIG. 2A is a plan view of a tunable coupling antenna for a tunable antenna system according to an embodiment of the present invention, FIG. 2B is a cross-sectional view of the tunable coupling antenna of the tunable antenna system of the present invention, Fig. 8 is a perspective view showing that an antenna is mounted. Fig.

As shown in the figure, the tunable coupling antenna 300 is made of FPCB in the form of a film, attached to the antenna frame 200, and mounted on the tunable circuit board unit 100 of the tunable antenna system.

The tunable coupling antenna 300 for a tunable antenna system according to the present invention includes a main conductive member 310, a first conductive member 320 and a second conductive member 330, Quot; A "is formed between the first conductive member 320 and the first conductive member 320. [

As shown in the drawing, a tunable coupling antenna 300 for a tunable antenna system according to the best mode of the present invention has a first frequency band of 1710 MHz to 2170 MHz and a second frequency band of 880 MHz to 960 MHz In which a dual resonance band is formed.

More specifically, in the tunable antenna system using the tunable coupling antenna, the tunable coupling antenna 300 operates in a first frequency band of 1710 MHz to 2170 MHz and a second frequency band of 880 MHz to 960 MHz, When the coupling antenna 300 is mounted on the tunable circuit board unit 100 of the tunable antenna system, the third to Nth frequency bands including the second frequency band, And operates in a dual resonance band composed of one frequency band and the first frequency band.

In the tunable antenna system using the tunable coupling antenna according to the preferred embodiment of the present invention, the first frequency band is 1710 MHz to 2170 MHz, the second frequency band is 880 MHz to 960 MHz, the third frequency band is 824 MHz to 894 MHz , The fourth frequency band is 704 MHz to 746 MHz, and any of the above-mentioned second to fourth frequency bands is switched by the tunable switch to select one of the N chip devices 123 And is operated in a resonance frequency band determined by the chip element and a dual resonance band composed of the first frequency band.

Therefore, the tunable antenna system using the tunable coupling antenna of the present invention is superior in that the tuning-coupling antenna 300 is provided between the main conductive member 310 of the tunable coupling antenna 300 and the first conductive member 320 Since the coupling line region "A" is electromagnetically coupled in a wide-length range in an interdigitated pattern, it is connected to the tunable switch 121 of the tunable matching unit 120 for switching the resonance frequency in the tunable antenna system Since the value of the chip element 123 is compensated by the inductance and the capacitance component generated by the coupling electromagnetic coupling, the resonance frequency can be easily shifted even if a chip element having a smaller value is used, In addition to cost savings from the use of chip devices, it is possible to reduce the efficiency deterioration due to the loss of a device, The effect can be.

The detailed structure of the tunable antenna system using the tunable coupling antenna according to the present invention will be described with reference to a plan view of the tunable coupling antenna of FIG. 2A and a tunable circuit substrate 100 of the tunable antenna system of FIG. The tunable coupling antenna 300 will be described below with reference to a perspective view.

The tunable coupling antenna 300 of the present invention is formed of a polymer synthetic resin film and has a main conductive member 310, a first conductive member 320, and a second conductive member 320 over the upper surface, 2 conductive member 330 is surface-mounted.

As shown in the drawing, the main conductive member 310 of the tunable coupling antenna 300 includes a tunable circuit board unit 100 in which the tunable coupling antenna 300 is mounted in the tunable antenna system of FIG. 1 And is electrically connected to the feed pattern 111 of the connection pattern unit 110 and is spaced apart from the first conductive member 320 by a predetermined distance so as to be capable of electromagnetic coupling.

The main conductive member 310 of the tunable coupling antenna 300 of the present invention includes a first pattern portion 311 that functions as a radiation means formed on the upper surface of the antenna frame 200, A third pattern portion 313 formed on the side surface and the lower surface of the antenna frame 200 and a power feed pad 314 formed on the lower surface of the antenna frame 200.

The first pattern part 311 is formed in a conductive pattern formed in a direction perpendicular to the upper surface of the antenna frame 200. The second pattern part 312 is formed as a conductive pattern part connected to one end of the first pattern part 311 and extending in a first direction perpendicular to the first pattern part 311 In order to form a coupling section "A" between the main conductive member 310 and the first conductive member 320, a coupling line to be electromagnetically coupled in an interdigitated pattern is formed in a predetermined region of the pattern section 312 And a first finger set formed to have a length .

The third pattern part 313 is connected to the other end of the first pattern part 311 and extends in a direction opposite to the vertical direction of the first pattern part 311, (Not shown). And a feed pad 314 is connected to the third pattern part and is formed on a lower surface of the antenna frame 200. [

Therefore, the feed pad 314 of the main conductive member formed on the lower surface of the antenna frame 200 of the present invention can be mounted on the tunable circuit board unit 100 of the tunable antenna system, And is electrically connected to the feed pattern 111 of the connection pattern unit 110 formed on the tunable circuit board unit 100 to receive an RF signal from the feed circuit connected to the feed line.

The first conductive member 320 of the tunable coupling antenna 300 of the present invention may be formed in parallel with the first pattern portion of the main conductive member so as to function as a radiating means on the upper surface of the antenna frame 200 A fourth pattern portion 321 formed on one side of the first pattern portion to have a length smaller than that of the first pattern portion of the main conductive member and a second pattern portion 321 connected to the fourth pattern portion 321, A coupling line which is electromagnetically coupled in an interdigitated pattern corresponding to the first finger set formed on the second pattern portion 312 of the main conductive member is formed on the fifth pattern portion 322 extending in the first direction, And an extended pattern portion extending from the fifth pattern portion 322 in a second direction opposite to the first direction of the fifth pattern portion 322, 325).

The first conductive member 320 of the tunable coupling antenna 300 of the present invention is connected to the fourth pattern unit 321 and is connected to the antenna frame 200 A sixth pattern part 323 formed on a side surface of the antenna frame 200 and a lower surface of the antenna frame 200 and a first ground pad 324 connected to the sixth pattern part, Respectively.

Therefore, the first ground pad 324 of the first conductive member formed on the lower surface of the antenna frame 200 of the present invention is formed by the tunable coupling antenna 300 and the tunable circuit board portion 100 of the tunable antenna system The tunerable circuit board portion 100 is electrically connected to the first ground pattern 112 and is connected to the first ground pattern 112. In this case, And the tunable switch 121 is selectively connected to the connected chip element 123 and connected to the ground connection pattern part 124 connected to the ground part 125 via the via hole .

The second conductive member 330 of the tunable coupling antenna 300 of the present invention is mounted on the upper surface of the antenna frame 200 serving as a radiating means formed on the upper surface of the antenna frame 200, Formed in the same length as the fourth pattern portion 321 of the first conductive member 320 on the other side of the first pattern portion 311 in parallel with the one pattern portion 311 of the main conductive member 310, Formed in a predetermined length in a second direction that is perpendicular to the fifth pattern portion 322 of the first conductive member 32 and is connected to the seventh pattern portion 331, A pattern portion 332 is formed.

The second conductive member 330 of the tunable coupling antenna 300 of the present invention is connected to the seventh pattern portion 331 and extends in a direction opposite to the vertical direction of the seventh pattern portion 331, A ninth pattern portion 333 formed on the side surface of the frame 200 and the lower surface of the antenna frame 200 and a ninth pattern portion 333 formed on the lower surface of the antenna frame 200, And a second ground pad 334 which is formed on the surface of the substrate.

Therefore, the second ground pad 334 of the second conductive member 330 formed on the lower surface of the antenna frame 200 of the present invention is formed by the tunable coupling antenna 300, The second ground pattern 113 formed on the tunable circuit board unit 100 is electrically connected to the grounding unit 125. In this case,

The tunable coupling antenna 300 including the main conductive member 310 and the first conductive member 320 and the second conductive member 330 may be formed in a first frequency band and a second frequency band The first frequency band is operated at 1710 MHz to 2170 MHz, and the second frequency band is operated at 880 MHz to 960 MHz.

When an RF signal is applied to the power feeding pattern 111 of the connection pattern portion 110 of the tunable circuit board portion 100, the main pattern of the main conductive member 310 connected to the power feeding pattern 111 of the connection pattern portion 110 An RF signal is applied from the feeding pad 314 to the second pattern portion 312 through the third pattern portion 313 and the first pattern 311. [

When the RF signal is applied to the second pattern portion 312 of the main conductive member 310 as described above, the first finger set of the second pattern portion 312 is coupled with the second finger set Electromagnetic coupling is generated in the area "A" by the first conductive member 320. The applied RF signal is transmitted from the main conductive member 310 to the first conductive member 320 through the electromagnetic coupling of the " 320).

The first conductive member 320 is connected to the tunable switch 121 of the tunable matching unit 120 through the first ground pattern 112 of the connection pattern unit 110 in the tunable circuit board unit 100 The tunable coupling antenna 300 operates at a shifted resonance frequency suitable for any one of the N chip devices 123 electrically connected to the tunable switch 121 and selectively switched to the tunable switch 121.

As described above, the tunable coupling antenna 300 of the present invention includes the first ground pad 112 and the first ground pad 113 of the connection pattern unit 110 of the tunable circuit board unit 100, 112 are electrically connected to one end of the tunable switch 121 provided in the tunable matching unit 120 of the tunable circuit board unit 100 to operate at a shifted resonance frequency.

Here, in the tunable coupling antenna of the present invention, the "A" region formed by the main conductive member 310 and the first conductive member 320, which are conductive pattern regions, is formed in the second pattern portion 312 of the main conductive member 310 And a second finger set of the first conductive member 320 are closely coupled to each other to form a coupling line that is electromagnetically coupled with the interdigitated pattern in a predetermined length, Coupling inductance and capacitance components are generated because of electromagnetic coupling coupled to the length range.

That is, due to the inductance or the capacitance component generated in the coupling conductive pattern region formed by the main conductive member 310 and the first conductive member 320, the inductance or capacitance component of the tunable circuit substrate unit 100 existing in the tunable antenna system The RF1 151, RF2 152, and RF1 152, which are included in the tunable matching unit 120 and are used for the resonant frequency transition switched by the tunable switch 121 according to the best mode of the present invention, Since the values of the RF3 153 are compensated for each, the efficiency deterioration due to the loss value of the chip element can be minimized by using the chip element with a smaller value, and the cost due to the use of the low- It is possible to provide a tunable antenna system using a tunable coupling antenna in which movement is easy.

3A is a plan view of a general antenna mounted on the tunable antenna system of the present invention, and FIG. 3B is a perspective view showing that the general antenna of FIG. 3A is mounted on the tunable circuit board portion of the tunable antenna system of the present invention. to be.

The main conductive member 410 of the antenna 400 without the interdigit coupling is electrically connected to the feed pattern 111 of the connection pattern portion 110 in the tunable circuit board portion 100 of the tunable system, Quot; A "region where the main conductive member 410 and the first conductive member 420 are adjacent to each other, and the applied RF signal is transmitted through the electromagnetic coupling in the region" A " To the first conductive member (420).

The first conductive member 420 is connected to the first ground pattern 112 of the connection pattern portion 110 and is electrically connected to the tunable switch 121 to operate at a shifted resonance frequency.

As shown in FIG. 3B, a general antenna is made of FPCB in film form as shown in FIG. 2 of the present invention, and is attached to the antenna frame 200 and mounted on the tunable circuit board unit 100 of the tunable antenna system.

Hereinafter, with reference to the attached data, it is assumed that the antenna 400 having no inter-wired coupling is mounted on the tunable antenna system and the case where the tunable coupling antenna 300 having the inter-wired coupling of the present invention is mounted The effect obtained by mutual comparison will be described in detail.

4A is a view showing a VSWR when the general antenna 400 of FIG. 3B is mounted on the tunable antenna system of the present invention. FIG. 4B is a view showing a VSWR of the tunable coupling antenna 300 of FIG. Fig. 5 is a diagram showing VSWR when the antenna system is mounted. Fig.

As shown in the figure, the two antennas have a dual resonant band, a low frequency band is LTE Band8 (880MHz to 960MHz), and a high frequency band operates in LTE Band 1, 2 and 3 (1710MHz to 2170MHz) frequency bands It can be confirmed that it is supported to the communication band of LTE Band 5 (824 MHz to 894 MHz) and LTE Band 17 (704 MHz to 746 MHz) when it is mounted on the tunable circuit board portion 100 of the tunable antenna system.

3B, when a general antenna 400 is mounted, a chip element of 18 nH is connected to the RF1 151 among the N number of chip elements 123 of the tunable matching unit 120 existing in the tunable antenna system When the tunable coupling antenna 300 according to the present invention shown in FIG. 2B is mounted, the tunable coupling antenna 300 is operated while the resonant band is shifted to the LTE Band 17 (704 MHz to 746 MHz) The inductance value of about 10 nH is compensated for in the electromagnetic coupling region of the conductive pattern region "A " formed by the main conductive member 310 and the first conductive member 320 of the tunable coupler 120, 123, the resonance band is shifted to LTE Band 5 (824 MHz to 894 MHz) by the inductance chip device of 8.2 nH.

Therefore, when the RF1 (151) chip element having the value of 8.2nH is selected and switched by the Nx1 tunable switch 121 of the tunable matching unit 120, In this case, the tunable coupling antenna 300 according to the present invention has the LTE Band 17 (704 MHz to 746 MHz) band in the low frequency band, And the high frequency band operates with an antenna having dual resonant bands operating in the LTE Band 1, 2, and 3 (1710 MHz to 2170 MHz) frequency bands.

Next, the values of the chip elements used for the RF2 152 among the N pieces of the chip elements 123 of the tunable matching unit 120 existing in the tunable antenna system are the same as those of the general antenna 400 shown in FIG. 3B When the tunable coupling antenna 300 is mounted as shown in FIG. 2B of the present invention, the tunable coupling antenna 300 is mounted on the inductance chip element having the RF2 152 of 4.7 nH, The inductance value of about 2.5 nH is compensated in the electromagnetic coupling region of the conductive pattern region "A " formed of the main conductive member 310 and the first conductive member 320 of the tunable block matching unit 120, It can be seen that the RF2 152 of the antenna 123 operates by shifting the resonance band to LTE Band 5 (824 MHz to 894 MHz) by the inductance chip device having a value of 2.2 nH which is less than about 2.5 nH compensated.

Therefore, when the RF2 (152) chip element having the value of 2.2 nH is selected and switched by the Nx1 tunable switch 121 of the tunable matching unit 120, any one of the third to Nth frequency bands The tunable coupling antenna 300 in this case operates in the LTE band 5 (824 MHz to 894 MHz) band by shifting the resonance frequency in the LTE Band 5 (824 MHz to 894 MHz) band, which is one resonance frequency band, The high frequency band operates with an antenna having a dual resonant band operating in the LTE Band 1, 2, and 3 (1710 MHz to 2170 MHz) frequency bands.

That is, when the tunable coupling antenna 300 having the interdigitated coupling section of the present invention is mounted as shown in FIG. 2B, as compared with the antenna 400 having no interdigit coupling section as shown in FIG. 3B The impedance matching characteristics are improved in the low frequency band and the high frequency band, and the resonance frequency is changed by using the chip device having a smaller value, so that the dual resonance band is operated.

5 is a diagram showing the antenna gains when the tunable coupling antenna 300 is mounted on the tunable antenna system of the present invention and when the general antenna 400 is mounted, And a tunable coupling antenna 300 having an interdigitated coupling section according to the present invention is mounted on the antenna 400. The antenna gain of the tunable coupling antenna 300 of the present invention is shown in FIG.

As shown in the figure, the RF1 (151) chip element among the N chip elements 123 is selected by the N × 1 tunable switch 121 of the tunable matching unit 120, The antenna gain measured in the LTE Band 17 (704 MHz to 746 MHz) band, which is one of the shifted resonance frequency bands of the Nth frequency band, is set to RF1 when the tunable coupling antenna 300 of the present invention shown in FIG. An inductance chip element having a value of 8.2 nH is used for the antenna 151 and a measured value of -5.8 dBi is obtained for the antenna gain in this case. However, when the general antenna 400 of FIG. 3B is mounted, ), A chip device of 18nH is used, and an antenna gain of -6.9dBi is observed.

Therefore, it can be seen that the efficiency deterioration is improved in the LTE Band 17 (704 MHz to 746 MHz) band because the gain of the antenna gain is as high as 1.1 dBi as compared with the general antenna 400 having no interdigitated coupling section in FIG. 3B Which compensates for an inductance value of about 10 nH in the "A" electromagnetic coupling section of the conductive pattern region formed by the main conductive member 310 and the first conductive member 320 of the tunable coupling antenna 300 of the present invention It is possible to reduce the efficiency deterioration owing to the effect of reducing the loss of the chip device. Thus, it can be confirmed that the antenna efficiency is improved.

Similarly, when the tunable coupling antenna 300 of the present invention as shown in FIG. 2B is mounted, the antenna gain of the LTE band 5 (824 MHz to 894 MHz) And the antenna gain in this case is -4.0 dBi. When a general antenna 400 having no interdigitated coupling section as shown in FIG. 3B is mounted, the RF2 152 is set to 4.7 nH And the antenna gain in this case is -5.2 dBi. As shown in the figure, the tunable coupling antenna 300 has an antenna gain (gain) in comparison with a general antenna 400 having no interdigitated coupling section, It can be seen that the efficiency deterioration is improved in the LTE Band 5 (824 MHz to 894 MHz) band because the gain is higher than about 1.2 dBi. This is also true of the main conductive member of the tunable- 310) Since the inductance value of about 2.5 nH is compensated in the electromagnetic coupling section of the conductive pattern region formed by the first conductive member 320, the efficiency deterioration can be reduced due to the effect of reducing the loss of the chip element, Is improved.

As described above, according to the present invention, coupling lines that are electromagnetically coupled in a wide length range in an interdigitated pattern are formed and connected to a tunable switch used for resonant frequency transition in a tunable antenna system by an inductance or a capacitance component generated Since the value of the inductance or the capacitance chip elements compensated for, the frequency shift to a specific band can be easily performed even if a chip element with a smaller value is used. In addition to the cost reduction due to the use of a small value chip element, It is possible to provide a tunable antenna system using a tunable coupling antenna capable of reducing the deterioration of efficiency due to the value of the tunable antenna.

As described above, in the tunable antenna system using the tunable coupling antenna according to the present invention, the tunable coupling antenna basically has a first resonant frequency band of 1710 MHz to 2170 MHz and a second frequency band of 880 MHz to 960 MHz However, when the tunable coupling antenna according to the present invention is mounted on the tunable circuit board portion of the tunable antenna system, it operates in a frequency band from 824 MHz to 894 MHz, which is the third frequency band, and from 704 MHz to 746 MHz, which is the fourth frequency band. Also, even if a chip element having a lower inductance or capacitance value than a general antenna is used, it is possible to easily move the resonance frequency and to reduce the efficiency deterioration due to the loss value of the element as much as possible. .

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 to limit the amount of components that can be equally coped with within a range that does not deviate from the scope of the present invention.

100: Tunable circuit board part 110: Connection pattern part
111: feeding pattern 112: first ground pattern
113: second ground pattern 120: tunable matching unit
121: N × 1 tunable switch 122: matching pattern portion
123: N chip elements 124: ground connection pattern part
125: ground portion 126:
200: Antenna frame 300: Tunable coupling antenna
310: main conductive member 311: first pattern portion
312: second pattern portion 313: third pattern portion
314: feed pad 320: first conductive member
321: fourth pattern portion 322: fifth pattern portion
323: sixth pattern portion 324: first ground pad
325: extender pattern part 330: second conductive member
331: seventh pattern unit 332: eighth pattern unit
333: ninth pattern portion 334: second ground pad
400: general antenna 410: main conductive member
420: first conductive member 430: second conductive member

Claims (15)

A first ground pattern connected to a tunable matching unit including a tunable switch, and a connection pattern formed by a second ground pattern connected to a ground for grounding the RF signal. A tunable circuit board portion having a portion;
A main conductive member formed of a polymeric synthetic resin film and mounted on the antenna frame and connected to the feeding pattern of the connection pattern portion formed on the antenna frame; and a conductive pattern formed on the antenna frame, 1 conductive member and a second conductive member formed on the antenna frame and connected to a second ground pattern of the connection pattern portion, the tunable coupler antenna being mounted on the tunable circuit substrate portion; Lt; / RTI >
Wherein the main conductive member of the tunable coupling antenna comprises: A first pattern unit extending in a direction perpendicular to an upper surface of the antenna frame and a first finger set having a predetermined length in a pattern unit connected to the first pattern unit and extending in a first direction perpendicular to the first pattern unit And a second pattern portion
Wherein the first conductive member of the tunable coupling antenna comprises: A fourth pattern portion formed on an upper surface of the antenna frame at a side of the first pattern portion in parallel to the first pattern portion of the main conductive member to have a length less than the first pattern portion of the main conductive member, A coupling line which is connected to the first pattern unit and is electromagnetically coupled in an interdigitated pattern in correspondence with the first finger set formed on the second pattern unit of the main conductive member in a pattern part extending in a first direction perpendicular to the fourth pattern unit, A fifth pattern portion having a second finger set formed thereon, and an extended pattern portion extending from the fifth pattern portion in a second direction opposite to the first direction of the fifth pattern portion,
The second conductive member of the tunable coupling antenna comprises: A seventh pattern portion formed on the upper surface of the antenna frame to have the same length as the fourth pattern portion of the first conductive member on the other side of the first pattern portion in parallel with the first pattern portion of the main conductive member, And an eighth pattern portion connected to the pattern portion and formed in a predetermined length in a second direction which is a direction perpendicular to the fifth pattern portion.
delete The method according to claim 1,
Wherein the main conductive member comprises: A third pattern portion connected to the first pattern portion and extending in a direction opposite to a vertical direction of the first pattern portion, the third pattern portion being formed on a side surface of the antenna frame and a lower surface of the antenna frame, And a feed pad connected to the feed pattern of the connection pattern portion in the tunable circuit board portion,
The first conductive member comprises: A sixth pattern portion connected to the fourth pattern portion and extending in a direction opposite to a vertical direction of the fourth pattern portion and extending from a side surface of the antenna frame to a lower surface of the antenna frame, Wherein the first ground pad is connected to the first ground pattern of the connection pattern portion in the tunable circuit board portion,
The second conductive member comprises: A ninth pattern portion connected to the seventh pattern portion and extending from a side surface of the antenna frame and a lower surface of the antenna frame in a direction opposite to a vertical direction of the seventh pattern portion; Wherein the second ground pad is connected to the second ground pattern of the connection pattern portion in the tunable circuit board portion.
The method according to claim 1 or 3,
Wherein the tunable matching unit of the tunable circuit board unit comprises:
An N × 1 tunable switch connected to the first ground pattern, N matching pattern parts connected to the N × 1 tunable switch, N chip devices connected to each of the N matching pattern parts, And a ground connection pattern part having a first end connected to the N chips in series and a second end connected to a grounding part.
The method of claim 4,
Wherein the tunable coupling antenna including the main conductive member, the first conductive member, and the second conductive member is operated in a dual resonant band formed of a first frequency band and a second frequency band, Tunable antenna system using.
The method of claim 5,
Wherein the first frequency band is 1710 MHz to 2170 MHz and the second frequency band is 880 MHz to 960 MHz.
The method of claim 5,
When the tunable coupling antenna comprising the main conductive member, the first conductive member, and the second conductive member is mounted on the connection pattern portion of the tunable circuit board portion including the tunable matching portion, The tunable switch compensated by an inductance component or a capacitance component generated by a coupling line that is electromagnetically coupled in a wide length range in an interdigitated pattern formed between the member and the first conductive member, Wherein the tuner is operated in any one of a third frequency band to an Nth frequency band and a first frequency band that are shifted except the second frequency band including the second frequency band. Antenna system.
The method of claim 5,
When an RF signal is applied to the main conductive member of the tunable coupling antenna, an RF signal is coupled to the first conductive member through an interdigitated pattern that is a coupling line that is electromagnetically coupled from the main conductive member The first ground pad of the first conductive member coupled to the main conductive member of the tunable coupling antenna is electrically connected to the first ground pattern of the connection pattern portion in the tunable circuit board portion, And a tunable switch of the tunable matching unit connected to the first ground pattern of the connection pattern unit is operated so that any one of the N chip devices is selected and switched so that the second frequency band including the second frequency band Operating in one of the shifted third to Nth frequency bands and the first frequency band corresponding to other selected chip elements The tunable antenna system using a tunable antenna coupling according to claim.
The method of claim 8,
Wherein the third frequency band is 824 MHz to 894 MHz and the fourth frequency band is 704 MHz to 746 MHz.
A ground connection pattern portion connected to the grounding portion, N chip elements connected in series to the ground connection pattern portion, and an Nx1 tunable switch connected to one of the chip elements, A matching unit; A connection pattern portion formed with a power supply pattern connected to a feeder line for feeding an RF signal and a first ground pattern connected to a tunable switch of the tunable matching portion, the tunable coupler antenna being mounted; A tunable circuit board portion made of a metal,
A tunable coupling antenna mounted on a connection pattern portion of the tunable circuit board portion includes a first conductive member connected to a first ground pattern of the connection pattern portion and resonating in a second frequency band; A main conductive member connected to the feeding pattern of the connection pattern portion; And a coupling line that is electromagnetically coupled to the main conductive member and the first conductive member in an interdigitated pattern of a predetermined length is formed on the main conductive member.
The method of claim 10,
The first conductive member, which receives an RF signal from the main conductive member of the tunable coupling antenna through coupling with the interdigitated pattern, is connected to the first grounding pattern by a switching operation of the tunable switch connected to the first grounding pattern Wherein the second frequency band includes at least one of a shifted third to Nth frequency band corresponding to a selected chip element other than the second frequency band including the second frequency band, And the tunable antenna system is operated by being shifted to one of the frequency bands.
12. The method according to claim 10 or 11,
The tunable circuit board portion is further provided with a second ground pattern connected to the ground portion,
The tunable coupling antenna further includes a second conductive member connected to the second ground pattern and resonating in a first frequency band,
Wherein the tunable coupling antenna forms a dual resonant band operating in a first frequency band and a second frequency band.
12. The method according to claim 10 or 11,
When an RF signal is applied to the main conductive member of the tunable coupling antenna, an RF signal is applied to the first conductive member through the coupling line-coupled interdigitated pattern from the main conductive member in coupling coupling A first conductive member coupled to the main conductive member of the tunable coupling antenna when the tunable switch of the tunable matching unit selects one of the N chip devices for switching connection, And a third grounding pattern of the connection pattern portion, the third grounding pattern being electrically connected to one of the third to Nth frequency bands including the second frequency band and shifted to a frequency band other than the second frequency band, Wherein the tunable antenna is operated in a dual resonance band formed in a first frequency band.
14. The method of claim 13,
The tunable coupling antenna is mounted on the tunable circuit board portion and is selected by a tunable switch. The inductance component or the capacitance component generated by the coupling line electromagnetically coupled to the interdigitated pattern is compensated A third frequency band that is shifted to a frequency band other than the second frequency band including the second frequency band corresponding to one of the N chip devices, Wherein the tunable antenna is operated in a dual resonance band formed in a first frequency band.
15. The method of claim 14,
Wherein the first frequency band is 1710 MHz to 2170 MHz, the second frequency band is 880 MHz to 960 MHz, the third frequency band is 824 MHz to 894 MHz, and the fourth frequency band is 704 MHz To 746 MHz. ≪ RTI ID = 0.0 > A < / RTI > tunable antenna system using a tunable coupling antenna.

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