KR101634274B1 - Antenna structrure - Google Patents

Abstract

An antenna structure is disclosed. The antenna structure of the present invention includes a plurality of block type antenna structures, a metal member positioned adjacent to the antenna structures, and a control unit for controlling electrical connection between the antenna structures, The first mode in which the antenna structures corresponding to the first combination are electrically connected to each other and the first antenna operates as the first antenna covering the first communication band and the antenna structures corresponding to the predetermined second combination are electrically connected to each other, And a second mode that operates as a second antenna covering the first antenna.

Description

Antenna structure

The present invention relates to an antenna structure, and more particularly to an antenna formed by a plurality of block-type antenna structures.

Most recently, wireless communication terminals including smart electronic devices such as smart phones and tablet computers have wireless communication functions capable of communicating with other terminals. At this time, the wireless communication terminal can communicate with other terminals through various communication bands according to the type and function of communication, and accordingly, the antenna of the wireless communication terminal is required to transmit and receive signals of various communication bands. Therefore, a recent wireless communication terminal has a plurality of antennas such as a main antenna, a sub antenna, and a BT-WiFi antenna according to functions and applications.

In recent years, wireless communication terminals are becoming smaller and thinner. In general, when a metallic component or a device is present around the antenna, the performance of the antenna may be deteriorated due to a scattering effect or an interference of an electromagnetic field. Further, in a commonly used planar inverted-F antenna (PIFA), if the separation distance between the radiation pattern of the antenna and the ground plane is not sufficiently secured, the performance of the antenna may be deteriorated. Accordingly, the shape of the conventional antenna is not suitable to be applied to a recent miniaturized and thinned portable terminal.

Background Art [0002] Recent wireless communication systems use a wider and wider communication band than the conventional ones. In addition, the communication band used in the wireless communication system is different depending on the country or the communication network to which it is connected. In addition, in order to support global roaming, a portable terminal needs to cover a wide communication band.

In this situation, the ability to change the communication bandwidth that the antenna can cover can be very useful. According to this function, one terminal can be used in a country or a communication network using different frequency bands, and the antenna performance can be maintained higher at the time of global roaming.

Therefore, there has been a demand for an antenna structure capable of solving the above-described problems associated with the miniaturization and thinning of the portable terminal, and capable of achieving the function related to the communication bandwidth change.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an antenna structure capable of ensuring sufficient performance by minimizing interference of peripheral structures even in a miniaturized and thinned wireless communication terminal.

Another object to be solved by the present invention is to provide an antenna structure which can be used in a wide communication band since the communication band to be covered can be changed.

Another object of the present invention is to provide an antenna structure capable of ensuring sufficient isolation with neighboring structures even when the communication band of the antenna is changed.

According to an aspect of the present invention, there is provided an antenna structure including a plurality of block type antenna structures, a metal member positioned adjacent to the antenna structures, and a control unit for controlling electrical connection between the antenna structures, The antenna structures are arranged such that the first mode in which the antenna structures corresponding to the predetermined first combination are electrically connected to each other to serve as the first antenna covering the first communication band and the antenna structures corresponding to the predetermined second combination are electrically And a second mode that operates as a second antenna that is connected to the second communication band and covers the second communication band.

In one embodiment of the present invention, the antenna structures may form at least a part of the side surface of the housing of the wireless communication terminal.

In one embodiment of the present invention, the housing of the wireless communication terminal may include a front surface including a display portion, a rear surface facing the front surface, and a side surface connecting the front surface and the rear surface.

In one embodiment of the present invention, the side surface is divided into a front surface side contacting with a front surface of the housing and a rear surface side contacting with a rear surface of the housing, and the antenna structures may be formed of any one selected from the front surface side surface and the rear surface side And the metal member may form at least a part of the other of the front surface side surface and the rear surface side.

In one embodiment of the present invention, the front surface side and the rear surface side may be electrically separated from each other.

In an embodiment of the present invention, a gap may be formed between the front surface side surface and the rear surface side surface, and the gap may be filled with a dielectric material.

In one embodiment of the present invention, the antenna structures may be formed to surround the side surface.

In one embodiment of the present invention, the plurality of antenna structures may be arranged in a direction parallel to a side surface and a front surface of the housing.

In one embodiment of the present invention, the switch further includes a switch for electrically connecting the antenna structures corresponding to the first combination or the second combination according to the selection of either the first mode or the second mode .

In one embodiment of the present invention, the antenna may further include at least one electric element electrically connected to the first antenna or the second antenna and having a frequency-dependent impedance.

In one embodiment of the present invention, the antenna further includes a grounding portion electrically connected to at least a portion of the metal member, wherein when the first mode is selected, the isolation between the first antenna and the metal member, -8 dB or less, and if the second mode is selected, the isolation between the second antenna and the metal member may be -8 dB or less in the second communication band.

In one embodiment of the present invention, the electronic device may further include at least one electric element located between the metal member and the grounding portion electrically connected to the metal member, and having a frequency-dependent impedance.

In one embodiment of the present invention, the electrical device is characterized in that, when the first mode is selected, the isolation between the first antenna and the metal member is less than or equal to -8 dB in the first communication band, The isolation between the second antenna and the metal member may be adjusted to be -8 dB or less in the second communication band.

In one embodiment of the present invention, the electrical element may have a variable impedance depending on the selection of either the first mode or the second mode.

The antenna structure according to an embodiment of the present invention minimizes the interference of the surrounding structures even in a miniaturized and thinned wireless communication terminal, and sufficient performance can be secured.

The antenna structure according to an embodiment of the present invention can be used in a wide communication band since the covering communication band can be changed.

The antenna structure according to an embodiment of the present invention can secure sufficient isolation with surrounding structures even when the communication band of the antenna is changed.

Figure 1 is a perspective view of an exemplary wireless communication terminal capable of having an antenna structure.
2 is a schematic view of an antenna structure.
3 is a schematic plan view of an antenna structure and an internal configuration inside the wireless communication terminal.
4 is a schematic perspective view of a portion of an antenna structure within the wireless communication terminal.
5 is a circuit diagram schematically showing a connection relationship between antenna structures and connection members connecting the antenna structures.
FIG. 6 is a perspective view showing that a first antenna is formed as an example of an exemplary antenna. FIG.
7 is a perspective view showing that a second antenna is formed as an example of an exemplary antenna.
8 is a graph showing the standing wave ratio values of the exemplary first and second antennas as a function of frequency.
9 is a schematic perspective view of an internal configuration of an exemplary backplane communication terminal that may include an antenna structure.
10 is a graph showing the isolation between the antenna and the metal member as a function of frequency.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is judged that it is possible to make the gist of the present invention obscure by adding a detailed description of a technique or configuration already known in the field, it is omitted from the detailed description. In addition, terms used in the present specification are terms used to appropriately express the embodiments of the present invention, which may vary depending on the person or custom in the relevant field. Therefore, the definitions of these terms should be based on the contents throughout this specification.

Hereinafter, an antenna structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10 attached hereto.

The present invention relates to an antenna structure. The antenna structure is mounted on a wireless communication terminal and can transmit and receive wireless signals of a communication band defined by a specific frequency band. The fact that the antenna structure or antenna covers a specific communication band means that the antenna structure or the antenna satisfies the transmission and reception performance required by a conventional wireless communication system for the radio signal of the communication band. Here, the transmission / reception performance may be defined as a voltage standing wave ratio (VSWR) or an antenna gain according to a frequency, but is not limited thereto.

The wireless communication terminal may be a portable electronic device or any other suitable type of electronic device. For example, the wireless communication terminal may be a smart phone, a cellular telephone, a laptop computer, a tablet computer, a media player, a headphone device, a wearable electronic device, and the like.

FIG. 1 illustrates an exemplary wireless communication terminal 100 that may include an antenna structure. Referring to FIG. 1, the wireless communication terminal 100 may include an external housing. The housing may be referred to as a case and may be in the form of a combination of two or more separate structures. The housing may be formed of various materials. For example, the housing may be formed of plastic, glass, ceramics, metal, or the like, and may be formed of a combination of the above materials. However, in the housing, the specific portion should be formed of a dielectric material in consideration of electrical conductivity, and the other specific portion may be formed of a metal material.

The wireless communication terminal 100 may include a display unit 111 through which a video image can be output. In a commonly used smart phone, tablet computer, or the like, the display unit 111 forms at least a part of the front surface 110 of the housing. The display portion 111 may be, for example, a light emitting diode (LED), an organic light emitting diode (OLED), a liquid crystal display portion (LCD) The display unit 111 may be a touch screen including a touch electrode. The display unit 111 may be formed in a substantially rectangular shape.

An opening may be formed in the front surface 110 of the housing so that the display unit 111 is exposed to the outside. The effective area (area where the image pixel is located) of the display unit 111 is exposed to the outside through the opening. The front surface 110 of the housing may be formed in a substantially rectangular shape. 1, the long side may be a length L of the wireless communication terminal 100, and the short side may be a width of the wireless communication terminal 100 W).

The rear surface 150 of the housing is formed to face the front surface 110 and is spaced apart by a predetermined distance so that an internal space can be formed therebetween. The rear surface 150 of the housing may include a structure in which the battery of the wireless communication terminal 100 is mounted as the case may be. In addition, the rear surface 150 of the housing may be a battery cover case covered with a battery mounted on the inner rear case as the case may be.

The side surface 130 of the housing corresponds to a portion connecting the front surface 110 and the rear surface 150 of the housing. The side surface 130 of the housing may be in the form of a band surrounding the front surface 110 and the rear surface 150. In some cases, the side surface 130 of the housing may serve as a bezel of the display unit 111 formed on the front surface 110. The side surface 130 of the housing may be substantially perpendicular to the front surface 110 and the rear surface 150. Typically, the width of the side surface 130 of the housing may be the thickness T or height of the wireless communication terminal 100. The length of the side surface 130 of the housing may be the length L or the width W of the wireless communication terminal 100. [

A button portion, a sensor portion, a connector portion, or the like may be formed on the side surface 130 of the wireless communication terminal 100. The side surface 130 of the housing may be formed with an opening 140 through which the button portion, the sensor portion, the connector portion, or the like can be coupled.

The side surface 130 of the wireless communication terminal 100 may be divided into a front side surface 131 and a rear side surface 132. The front side surface 131 is a portion contacting the front surface 110 of the housing and the rear side surface 132 is a portion contacting the rear surface 150 of the housing. A gap 220 is formed between the front side surface 131 and the rear side surface 132 and the gap 220 can be filled with a dielectric.

Figure 2 shows a schematic perspective view of an exemplary antenna structure, inside the wireless communication terminal.

Referring to FIG. 2, the antenna structure of the present invention includes antenna structures 200, a metal member 300, a control unit 400, and a ground unit 500.

A plurality of antenna structures 200 are formed. The plurality of antenna structures 200 are not directly electrically connected to each other. Here, the term " directly electrically connected " means not electrically connected via another conductive member, but means that the two structures are electrically connected by direct contact. Thus, in the present invention, the plurality of antenna structures 200 are not electrically connected by direct contact, although they may be electrically connected by other conductive members (e.g., switches, as described below).

The antenna structures 200 are formed in a block shape. The blocks of the antenna structures 200 are each formed of a structure that can be separated from each other. The blocks of the antenna structures 200 may be regularly arranged in one direction so that at least one of the widths or lengths of the adjacent antenna structures 200 is the same as the adjacent antenna structures 200 and the same one side is opposed to each other. Referring to FIG. 2, the antenna structures 200 are all formed in blocks of equal width and are regularly arranged in length or width direction. In particular, the plurality of antenna structures 200 may be arranged in a direction parallel to both the side surfaces 130 and the front surface 110 of the housing. Here, the lengths of the blocks of the antenna structure 200 may be different from each other.

A gap 210 may be formed between the antenna structures 200. These gaps 210 prevent the antenna structures 200 from being electrically connected by direct contact. The gap 210 may be filled with a dielectric.

The antenna structures 200 are partially or wholly formed of a conductive material. Even when a part of the antenna structure 200 is formed of a conductive material, it is preferable that the conductive material is formed to correspond to the width and length of the block. For example, the conductive material may be a plating layer formed on the surface of a block of a non-conductive material. The conductive material may be a metal material. The metal material may be, for example, gold, silver, copper, stainless steel, aluminum, tin, nickel, or the like.

The metal member 300 is positioned adjacent to the antenna structures 200. However, the metal member 300 is not electrically connected directly to the antenna structures 200. Specifically, a gap 220 is formed between the metal member 300 and the antenna structures 200. The gap 220 may be filled with a dielectric. The location of the metal member 300 adjacent to the antenna structures 200 means that the closest distance between the metal member 300 and the antenna structures 200 is less than 0.5 times the thickness T of the wireless communication terminal 100 .

The antenna structures 200 and the metal member 300 may form at least a portion of the side surface 130 of the housing of the wireless communication terminal 100. The side surface 130 of the housing of the wireless communication terminal 100 may be formed in the shape of a band surrounding the rim of the front surface 110 or the rear surface 150 of the housing.

1 and 2, the side surface 130 of the housing of the wireless communication terminal 100 is divided into a front side surface 131 which is in contact with the front surface 110 and a rear side surface 132 which is in contact with the rear surface 150 . The front side surface 131 and the rear side surface 132 may be divided into substantially equal widths, but the present invention is not limited thereto. A gap 220 is formed between the front side surface 131 and the rear side surface 132 and the gap 220 may be filled with a dielectric.

The antenna structures 200 may form at least a portion of a selected one of the front side surface 131 and the rear side surface 132 of the housing of the wireless communication terminal 100. The metal member 300 may form at least a part of the other of the antenna structure 200 of the front side surface 131 and the rear side surface 132 of the housing of the wireless communication terminal 100. [ Since the antenna structures 200 and the metal member 300 are formed on the side surface 130 of the housing together, the distance between the antenna structures 200 and the metal member 300 is equal to or less than 0.5 times the thickness T of the wireless communication terminal 100 Can be adjacent.

The antenna structures 200 constitute the front side surface 131 of the housing of the wireless communication terminal 100 and the metal members 300 are formed on the front side surface 131 of the housing of the wireless communication terminal 100. In the exemplary wireless communication terminal 100 shown in Figures 1 and 2, And the rear side surface 132 of the housing of the wireless communication terminal 100 is shown. The antenna structures 200 constitute the rear side surface 132 of the housing of the wireless communication terminal 100 and the metal member 300 is disposed on the front side surface of the housing of the wireless communication terminal 100 131).

Although the antenna structure 200, the metal member 300 and the gap 220 are shown as being the entirety of the side surface 130 in FIGS. 1 and 2, the side 130 of the housing of the wireless communication terminal 100 May further include an antenna structure 200, a metal member 300, and other members other than the gap.

Figure 3 shows the schematic connection relationship of the antenna structure. Referring to FIG. 3 together with FIG. 2, the wireless communication terminal 100 receives various functional circuits and components 600. Circuits and components 600 may be, for example, circuits and components for storage and processing. In particular, the circuitry and components for storage and processing may be implemented within a computer-readable medium such as a hard disk drive, a non-volatile storage device such as a flash memory, a microprocessor, a microcontroller, a digital signal processor, a base- And the like.

Circuitry and components 600 may also include, for example, input / output circuits and devices. Specifically, the input / output circuit and the apparatus may include a touch screen, a button, a touch pad, a keypad, a keyboard, a microphone, a speaker, a vibrator, a camera, a sensor, a light emitting diode,

Circuitry and components 600 may also include wireless communication components and circuitry. Specifically, the wireless communication components and circuits may include amplifier circuits, frequency components, communication modems, and the like.

The circuit and component (600) also include a controller (400) for controlling the antenna structure (200). The controller 400 may control electrical connections between the antenna structures 200. The control unit 400 may perform a signal quality monitoring operation, a sensor monitoring operation, and other data collection operations. It may be determined that the antenna structures 200 form the antenna 250 according to the data collected by this operation. For example, control unit 400 may determine which of two or more modes of antenna 250 is to be used for wireless communication. Accordingly, the controller 400 performs an operation for electrically connecting the antenna structures 200 corresponding to the determined mode to each other. The operation of the control unit 400 may be, for example, controlling the opening or shorting of the switch.

At least a portion of such circuitry and components may be mounted on a printed board assembly 700 housed within the housing of the wireless communication terminal 100. The circuit board assembly 700 may include two or more separate substrate structures, but preferably there is one main substrate structure in which the main circuit and components are formed. The circuit board assembly 700 may be provided with a grounding portion 500 forming a ground which forms a common ground for various circuits and components 600.

4 is a schematic perspective view of a portion of an antenna structure within the wireless communication terminal. Referring to FIG. 4, the antenna structures 200 operate as an antenna 250, either alone or in electrical connection with at least one other antenna structure 200. The antenna 250 is an electric element that transmits and receives a wireless signal used for wireless communication in the wireless communication terminal 100. The antenna 250 may be formed in the form of an appropriate antenna. Antenna 250 may be implemented, for example, by a dipole antenna structure, a monopole antenna structure, a helical antenna structure, a strip antenna structure, an inverted F antenna structure, a planar inverted F antenna structure, a patch antenna structure, a loop antenna structure, Antenna structure.

The communication band covered by the antenna pattern of the antenna 250 is determined. The antenna pattern has a predetermined electrical length. Normally, the longer the electrical length, the longer the communication band of the longer wavelength can be covered.

The communication band covered by the antenna 250 may be, for example, a cellular telephone band such as 850 MHz, 900 MHz, 1800 MHz, 1900 MHz, and 2100 MHz and a communication band having similar functions, for WiFi IEEE 802.11 communication such as 2.4 Ghz and 5 GHz A band for Bluetooth communication such as 2.4 GHz, a band for global positioning system (GPS) communication such as 1575 MHz, and a band for short range wireless communication such as 13.56 MHz.

The antenna structure 200 has a unique antenna pattern according to the shape of the block. When the antenna pattern of the single antenna structure 200 is suitable for transmitting and receiving radio signals of a specific communication band, the single antenna structure 200 can operate as an antenna covering the specific communication band.

In addition, when the antenna patterns of two or more antenna structures 200 are suitable for transmitting and receiving radio signals of a specific communication band, two or more electrically connected antenna structures 200 may be connected to an antenna (250).

At least some of the antenna structures 200 may include a terminal 240. The terminal 240 may be formed to protrude from the antenna structure 200 formed on the side surface 130 of the housing to the inside of the housing. At least a portion of the plurality of antenna structures 200 may include a protruding terminal 240.

The terminal 240 can be used as the feeding terminal 241 or the ground terminal 242 when the antenna 250 is formed. The antenna 250 may have a feeding terminal 241. In some cases, the ground terminal 242 may be provided separately from the feeding terminal 241. The feeding terminal 241 is electrically connected to a transmission / reception circuit 610 connected to wireless communication components and circuits. In some cases, the feeding terminal 241 may be connected to the transmission / reception circuit 610 via a separate transmission line such as a coaxial cable. The ground terminal 242 is electrically connected to the ground portion 500.

The feeding terminal 241 and the grounding terminal 242 designated and used according to the formed antenna 250 may be predetermined. Specifically, when a terminal is used as the feeding terminal 241, the terminal is electrically connected to the transmitting / receiving circuit 610. When any other terminal is used as the ground terminal 242, the terminal is electrically connected to the ground terminal 500.

5 is a circuit diagram schematically showing the connection relationship between the antenna structures 200 and the connecting member 230 connecting the antenna structures. Referring to FIG. 5, a connection member 230 connected to the terminal 240 may control the electrical connection of the antenna structures 200. Particularly, a selected one of the terminals 240 of the antenna structures 200 may be electrically connected to the transceiver 610 or the grounding unit 500. The connected terminal 240 may function as a feeding terminal 241 or a ground terminal 242 of the antenna 250. [ The electrical connection of the terminal 240 can be controlled by the control unit 400. [

The antenna structures 200 may be electrically connected to each other by the connection member 230 and the terminal 240. Specifically, the antenna structures 200 may be electrically connected to each other when the connection member 230 connected to the terminals 240 is short-circuited. The connecting member 230 may be, for example, a switch 230. The connection member 230 may be opened or short-circuited under the control of the control unit 400, which will be described later. The connection members 230 may typically electrically connect adjacent antenna structures 200. [ However, in some cases, the antenna structures 200 that are not adjacent to each other may also be electrically connected. In this case, the connection member 230 may include not only the switch 230 but also a separate connection line.

The wireless communication terminal 100 may perform wireless communication using different communication bands according to time, surrounding environment, or the like. Accordingly, in the antenna structure of the wireless communication terminal 100, different combinations of the antenna structures 200 that can operate as the antenna 250 for covering different communication bands may be predetermined.

For example, there may be a first communication band and a second communication band, which are optionally used for wireless communication in some cases. Here, it is preferable that the first communication band and the second communication band are different bands. In some cases, the first communication band and the second communication band may include some overlapping bands. It is preferable that the first communication band and the second communication band are mutually complementary communication bands and the two communication bands are not used at the same time.

The antenna structure may control the antenna structures 200 in a first mode to operate as a first antenna 251 covering the first communication band. In this case, the antenna structures 200 electrically connected to each other to form the first antenna 251 may correspond to the first combination.

FIG. 6 shows one embodiment of an exemplary antenna, in which a first antenna 251 is formed. Referring to FIG. 6, three shaded antenna structures 201 among a plurality of antenna structures are electrically connected to form a first antenna 251. The antenna structures 201 forming the first antenna 251 are electrically connected by a connecting member 231 connecting the antenna structures 201. The antenna structures 201 forming the first antenna 251 And the other antenna structures 200 are electrically separated from each other with the connection member 230 connecting therebetween opened. Here, the first antenna 251 may cover the first communication band.

And the antenna structure can control the antenna structures 200 in a second mode to operate as a second antenna 252 covering the second communication band. At this time, the antenna structures 200 electrically connected to each other to form the second antenna 252 may correspond to the second combination. Here, it is preferable that the antenna structures 200 corresponding to the first combination or the antenna structures 200 corresponding to the second combination are positioned adjacent to each other. However, in some cases, spaced apart antenna structures 200 may be included.

FIG. 7 illustrates one embodiment of an exemplary antenna, in which a second antenna 252 is formed. Referring to FIG. 7, four hatched antenna structures 202 among a plurality of antenna structures are electrically connected to form a second antenna 252. In particular, the antenna structures 202 forming the second antenna 252 may additionally include one further to the three antenna structures 201 forming the first antenna 251. The antenna structures 202 forming the second antenna 252 are electrically connected by a connecting member 231. On the other hand, the antenna structures 202 forming the second antenna 252 and the other antenna structures 200 are electrically isolated with the connection member 230 connecting therebetween opened. Here, the second antenna 252 may cover the first communication band.

In this manner, the antenna structure can control the antenna structures 200 to operate as an Nth antenna covering the Nth communication band in the Nth mode. At this time, the antenna structures 200 electrically connected to each other to form the Nth antenna may correspond to the Nth combination.

8 is a graph showing a standing wave ratio value of the first antenna 251 and the second antenna 252 of the antenna structure as a function of frequency. Referring to the standing wave ratio graph m1 of the first antenna, the standing wave ratio in the first communication band f1 satisfies the standard value or less and can cover the first communication band f1. Referring to the standing wave ratio graph m2 of the second antenna, the standing wave ratio in the second communication band f2 can be equal to or smaller than the reference value to cover the second communication band f2.

Here, as shown in FIGS. 6 to 8, the second antenna 252 may further include one additional antenna structure 200 connected to the first antenna 251. The electrical length of the antenna pattern of the second antenna 252 may be larger than that of the first antenna 251. The second communication band f2 covered by the second antenna 252 may be a band longer in wavelength than the first communication band f1 covered by the first antenna 251. [ This means that the frequency of the second communication band f2 is smaller than the frequency of the first communication band f1. Referring to FIG. 8, it can be seen that as the second antenna 252 is formed, the frequency of the communication band covered decreases.

The configurations of the first antenna 251 and the second antenna 251 shown in Figs. 6 to 7 and the relationship between the first communication band f1 and the second communication band f2 are merely illustrative. Therefore, the shape of the antenna and the range of the communication band are not limited to those shown.

If each mode for determining the shape of the antenna is not simultaneously implemented, one antenna structure 200 may be included in the combination corresponding to each mode. This case corresponds to the case where the communication bandwidth covered by the antenna in each mode is not used at the same time.

In the case where each mode for determining the shape of the antenna can be implemented simultaneously with each other, one antenna structure 200 can not be simultaneously included in the combination corresponding to each mode. This case corresponds to the case where the communication bandwidth covered by the antenna in each mode can be used at the same time.

4 to 5, when the feeding terminal 241 of the antenna 250 is electrically connected to the transmission / reception circuit 610 or when the transmission terminal is connected to the transmission / reception circuit 610, the SWR is minimized The impedance matching circuit 270 may be used. The impedance matching circuit 270 includes at least one electric element having a frequency-dependent impedance. For example, the impedance matching circuit 270 may be a combination of electric elements in which coils and / or capacitors are combined in series or in parallel.

It is frequency dependent that the antenna and the transmitting / receiving circuit are matched by the impedance matching circuit 270. That is, the fact that the antenna 250 and the transmission / reception circuit 610 are well-matched means that the antenna 250 is well matched with respect to the frequency of the signal corresponding to the specified communication band. Therefore, the impedance matching circuit 270 is electrically connected to the first antenna and the second antenna N, so that the antenna 250 has different impedances so as to be well matched with the transmission / reception circuit 610.

The impedance matching circuit 270 is fixed, and may be connected to a predetermined antenna in some cases to perform impedance matching.

In some cases, the impedance matching circuit 270 may be adjustable. In this case, the impedance matching circuit 270 is electrically connected to the antennas 250 of various modes so that the configuration of the impedance matching circuit 270 can be adjusted so that the antenna 250 can be well matched to the transmitting / receiving circuit 610 have. The configuration of the impedance matching circuit 270 may be predetermined in correspondence with each mode. Therefore, if the mode is set so that the antenna structures 200 form the specific antenna 250 in the controller 400, the impedance matching circuit 270 can be adjusted to have a configuration corresponding to the mode.

9 is a schematic perspective view of an internal configuration of an exemplary backplane communication terminal that may include an antenna structure. 10 is a graph showing the isolation between the antenna 250 and the metal member 300 as a function of frequency. 9 through 10, the antenna formed by the antenna structures 200 transmits and receives radio signals. However, if another conductor structure or the like is positioned adjacent to the antenna in this process, the performance of the antenna may be deteriorated. For example, signals may be interfered in the communication band covered by the antenna between the antenna and the conductor structure located adjacent to the antenna. In addition, an eddy current can be generated on the conductor structure located adjacent to the antenna by the radio signal of the communication band transmitted and received by the antenna. These phenomena may hinder the performance of the antenna.

As shown in FIG. 9, in the antenna structure of the present invention, the metal member 300 may be positioned adjacent to the antenna 250. At least a part of the metal member 300 may be connected to the ground portion 500.

The metal member 300 may hinder the performance of the antenna 250 formed by the antenna structure 200. In order to minimize or eliminate this, the metal member 300 needs to ensure sufficient isolation (electrical isolation) with the antenna 250. The reference value of the isolation between the antenna 250 and the metal member 300 can be determined differently depending on the surrounding environment or the like. For example, it is preferable that the isolation between the antenna 250 and the metal member 300 is -8 dB or less in the communication band covered by the antenna 250.

The isolation between the antenna 250 and the metal member 300 corresponds to a frequency-dependent value. In order to prevent the metallic member 300 from deteriorating the transmission / reception performance of the antenna 250, it is necessary to secure insulation below the reference value with respect to the communication band covered by the antenna 250. [

The isolation between the antenna 250 and the metal member 300 may be achieved by at least one electrical component 370 located between the metal member 300 and the ground 500. The at least one electrical device 370 may be connected in series between a portion of the metal member 300 and the ground 500. The electrical connection between electrical element 370 and ground 500 is schematically illustrated in FIG. The electrical element 370 includes at least one element having a frequency dependent impedance. For example, the electric element 370 may be a combination of electric elements in which a coil and / or a capacitor are combined in series or in parallel.

As described above, another antenna 250 may be formed according to a predetermined mode, so that a communication band covered by the antenna 250 may be changed. Therefore, if the communication band covered by the antenna 250 is changed, it is necessary to ensure isolation between the antenna 250 and the metal member 300 that is lower than the reference value in the changed communication band. For this purpose, the impedance of the electric device 370 connected to the metal member 300 may be adjusted.

Specifically, as shown in FIG. 10, when the first mode is selected, the first antenna 251 covers the first communication band f1. Graph n1 is a graph of the frequency of the isolation between the antenna 251 and the metal member 300 when the first mode is selected. As shown in the graph n1, the isolation between the antenna 251 and the metal member 300 should be below the reference value in the first communication band f1. Here, the reference value is preferably -8 dB or less. To this end, the electrical element 370 connected to the metal member 300 can be adjusted to have a specific impedance.

When the first mode is selected and the mode is changed to the second mode, the antenna forms the second antenna 252 and covers the second communication band f2. Graph n2 is a graph of the frequency of the isolation between antenna 252 and metal member 300 when the second mode is selected. As shown in the graph n2, the isolation between the antenna 252 and the metal member 300 should be below the reference value in the second communication band f2. Here, the reference value is preferably -8 dB. To this end, the electrical element 370 connected to the metal member 300 can be adjusted to have a specific impedance. Here, adjusting the impedance of the electric element 370 may be performed by the control unit 400.

The reflection coefficient when the signal is transmitted from the grounding unit 500 to the metal member 300 is transmitted from the antenna 250 to the antenna 250 so that the metal member 300 does not hinder the transmission / It can be adjusted to be equal to or less than the reference value in the communication band. For example, the reflection coefficient of the time the signal transmitted to the metal member 300 in the ground 500 in the communication band of the antenna 250 covers - it may be desirable that more than 8dB. The reflection coefficient may also be adjusted by an electrical element 370 connected to the metal member 300.

The embodiments of the antenna structure of the present invention have been described above. The present invention is not limited to the above-described embodiments and the accompanying drawings, and various modifications and changes may be made by those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be determined by the equivalents of the claims and the claims.

100: wireless communication terminal 130: side of the wireless communication terminal
200: antenna structure 230: switch, connecting member
240: Terminal 250: Antenna
251: first antenna 252: second antenna
300: metal member 370: electric element
400: control unit 500: ground unit
610: Transmitting /

Claims (14)

A plurality of block-type antenna structures;
A metal member positioned adjacent to the antenna structures; And
And a control unit for controlling electrical connection between the antenna structures,
The antenna structures may include a first mode in which antenna structures corresponding to a predetermined first combination are electrically connected to each other to function as a first antenna covering a first communication band, and antenna structures corresponding to a predetermined second combination And a second mode of operating as a second antenna that is electrically connected and covers the second communication band,
Wherein the antenna structures form at least a part of a side surface of a housing of a wireless communication terminal,
The side surface is divided into a front surface side contacting the front surface of the housing and a rear surface side contacting the rear surface of the housing,
Wherein the antenna structures form at least a part of a selected one of the front surface side surface and the rear surface side surface,
Wherein the metal member comprises at least a part of the other of the side surface of the front part and the side of the rear part.
delete The method according to claim 1,
The housing of the wireless communication terminal includes a front surface including a display portion, a rear surface facing the front surface, and a side surface connecting the front surface and the rear surface.
delete The method according to claim 1,
Wherein the front side surface and the rear side surface are electrically separated from each other.
The method according to claim 1,
A gap is formed between the front surface side surface and the rear surface side surface,
And the gap is filled with a dielectric.
The method according to claim 1,
Wherein the antenna structures are formed to surround the side surfaces.
The method according to claim 1,
Wherein the plurality of antenna structures are arranged in a direction parallel to a side surface and a front surface of the housing.
The method according to claim 1,
And a switch for electrically connecting the antenna structures corresponding to the first combination or the second combination to each other according to the selection of either the first mode or the second mode.
The method according to claim 1,
And at least one electrical element electrically connected to the first antenna or the second antenna and having a frequency dependent impedance.
The method according to claim 1,
Further comprising at least one electrical element located between the metal member and the ground that is electrically connected to the metal member and having a frequency dependent impedance.
12. The method of claim 11,
Wherein the electrical device has a variable impedance according to the selection of either the first mode or the second mode.
A plurality of block-type antenna structures;
A metal member positioned adjacent to the antenna structures; And
And a control unit for controlling electrical connection between the antenna structures,
The antenna structures may include a first mode in which antenna structures corresponding to a predetermined first combination are electrically connected to each other to function as a first antenna covering a first communication band, and antenna structures corresponding to a predetermined second combination And a second mode of operating as a second antenna that is electrically connected and covers the second communication band,
Further comprising at least one electrical element located between the metal member and the ground that is electrically connected to the metal member and having a frequency dependent impedance,
Wherein the electrical device is configured such that when the first mode is selected, the isolation between the first antenna and the metal member is -8 dB or less in the first communication band, and when the second mode is selected, Is adjusted to be -8 dB or less in the second communication band.
A plurality of block-type antenna structures;
A metal member positioned adjacent to the antenna structures; And
And a control unit for controlling electrical connection between the antenna structures,
The antenna structures may include a first mode in which antenna structures corresponding to a predetermined first combination are electrically connected to each other to function as a first antenna covering a first communication band, and antenna structures corresponding to a predetermined second combination And a second mode of operating as a second antenna that is electrically connected and covers the second communication band,
And a grounding portion electrically connected to at least a part of the metal member,
The isolation between the first antenna and the metal member is less than -8 dB in the first communication band when the first mode is selected and the isolation between the second antenna and the metal member is selected when the second mode is selected, And -8 dB or less in the second communication band.

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