KR101119603B1 - Apparatus for antenna - Google Patents

Abstract

An antenna device is disclosed. An antenna device according to an embodiment of the present invention, the first substrate; A first antenna that transmits and receives signals in a multiple frequency band and is electrically connected to a ground plane of the first substrate; A plurality of fillers formed on the first substrate and spaced apart from each other; A second substrate formed on the plurality of pillars and spaced apart from the first substrate by a predetermined height; And a second antenna that transmits and receives signals in a multiple frequency band and is electrically connected to a ground plane of the second substrate. The filler of any one of the plurality of fillers is formed of a conductor to electrically connect the ground plane of the first substrate and the ground plane of the second substrate.

MIMO, isolation, dongle

Description

Antenna device {Apparatus for antenna}

Embodiments of the present invention relate to a technology capable of improving the isolation between antennas and the antenna efficiency in an antenna device having a plurality of antennas embedded therein.

Recently, with the development of mobile communication technology, an antenna device capable of performing wireless communication in combination with an antenna element has been widely used. The antenna device includes a plurality of antennas for transmitting and receiving signals of different frequency bands. An example in which a plurality of antennas are embedded includes a multiple input multiple output (MIMO) antenna.

MIMO antennas are used in a wide variety of mobile communication terminals and repeaters by performing multiple input / output operations by arranging a plurality of antenna elements in a special structure.

However, since the MIMO antenna is provided with a plurality of antenna elements in a small terminal, the distance between each antenna element is inevitably narrowed. In this case, mutual interference occurs between electromagnetic waves radiated from each antenna element, resulting in a decrease in antenna efficiency. Problems will arise.

Embodiments of the present invention can improve the efficiency of the antenna by forming a first antenna and a second antenna spaced apart from each other, and connecting the first and second substrates electrically connected to each other to transmit and receive signals in a multi-frequency band, respectively. Make sure

Embodiments of the present invention by forming a separate inductor on the ground plane of the second substrate, it is possible to improve the isolation between the antenna in the high frequency band.

Other technical problems by the embodiments of the present invention can be understood by the following description, which can be realized by the means and combinations thereof shown in the claims.

An antenna device according to an embodiment of the present invention, the first substrate; A first antenna that transmits and receives signals in a multiple frequency band and is electrically connected to a ground plane of the first substrate; A plurality of fillers formed on the first substrate and spaced apart from each other; A second substrate formed on the plurality of pillars and spaced apart from the first substrate by a predetermined height; And a second antenna that transmits and receives signals in a multiple frequency band and is electrically connected to a ground plane of the second substrate. The filler of any one of the plurality of fillers is formed of a conductor to electrically connect the ground plane of the first substrate and the ground plane of the second substrate.

In this case, the conductor filler may be formed in an area that is the longest distance from the feeding portion of the first antenna and the feeding portion of the second antenna.

In addition, the ground plane of the first substrate and the ground plane of the second substrate may be electrically connected to each other through the conductor filler.

The second substrate may include a first ground plane electrically connected to the conductor filler on one surface of the second substrate, a second ground plane spaced apart from the first ground plane on the second substrate, and And an inductor connecting the first ground plane and the second ground plane.

According to the embodiments of the present invention, the isolation between antennas can be improved by mounting each antenna on a separate double board and shorting the double board by determining an optimal shorting area in consideration of the efficiency of each antenna in the double board. have.

In addition, by forming the inductor in the optimum short-circuit area, by reducing the phase inversion difference of the signal radiated between the substrate in the high frequency band, the isolation between the antenna can be improved, the efficiency of the antenna can be improved.

In this case, in the low frequency band, the dual substrates are short-circuited with each other, so that the ground plane formed on each of the dual substrates is expanded, thereby improving the efficiency of the antenna.

Hereinafter, specific embodiments of the antenna device of the present invention will be described with reference to FIGS. 1 to 7. However, this is only an example and the present invention is not limited thereto.

In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

In addition, the embodiment of the present invention to be carried out below is provided in the antenna configuration of the mobile communication terminal to effectively describe the technical components constituting the present invention, or a mobile communication that is usually provided in the technical field to which the present invention belongs The antenna configuration of the terminal is omitted as much as possible, and will be mainly described for the functional configuration that should be additionally provided for the present invention. If those skilled in the art to which the present invention pertains, it will be able to easily understand the function of the components that are used in the prior art among the components omitted, not shown below, and also the components omitted as described above And the relationship between the components added for the present invention will be clearly understood.

As a result, the technical spirit of the present invention is determined by the claims, and the following examples are one means for efficiently explaining the technical spirit of the present invention to those skilled in the art to which the present invention pertains. It is only.

1 is an internal perspective view showing an internal configuration of an antenna device according to an embodiment of the present invention, Figure 2 is a side view showing the side of the antenna device according to an embodiment of the present invention.

1 and 2, the antenna device 100 is an antenna that transmits and receives signals in multiple frequency bands, and includes a first substrate 101, a first antenna 110, a second substrate 121, and a second substrate. An antenna 130 is included.

The first substrate 101 includes a short circuit region that can be electrically connected to the second substrate 121. In addition, the first substrate 101 includes a circuit unit (not shown) for controlling the antenna device 100, and a ground surface 103 is formed on an upper surface or a lower surface of the first substrate 101. . The first substrate 101 is a general PCB (Printed Circuit Board) substrate, but may have a flat rectangular plate shape, but the present invention is not limited to the material, size, thickness and shape of the first substrate 101. In addition, the antenna device 100 may be changed in various ways according to the characteristics of the antenna and the usage environment.

The short circuit region formed on the first substrate 101 is the same as the short circuit region formed on the second substrate 121, and will be described in the description of the second substrate 121 to be described below.

The first antenna 110 includes a first antenna carrier 111 and a first antenna radiator 112.

The first antenna carrier 111 is formed by bonding to the first substrate 101 at one end of the first substrate 101. The first antenna carrier 111 radiates desired radiation by the first antenna radiator 112 by spacing a predetermined distance between the ground plane 103 of the first substrate 101 and the first antenna radiator 112. Allows the property to be implemented.

The first antenna radiator 112 may be formed on one or more surfaces of the first antenna carrier 111. For example, the first antenna radiator 112 may be formed on an upper surface and a front surface of the first antenna carrier 111. In this case, the first antenna radiator 112 may be formed to have various shapes and lengths according to a frequency band to be transmitted and received through the first antenna radiator 112.

The first antenna radiating unit 112 may be formed on the surface of the first antenna carrier 111 by a method such as PDS (Printing Direct Structuring) or LDS (Laser Direct Structuring). Can be formed.

The first antenna 110 is implemented to perform wireless communication in multiple frequency bands, for example, a high frequency band such as a Personal Communication System (PCS) of about 1.9 GHz and a Long Term Evolution (LTE) of about 0.7 GHz or Wireless communication may be performed in a low frequency band such as a digital cellular network (DCN) of about 0.8 GHz.

The second substrate 121 is formed on the first substrate 101 spaced apart from the first substrate 101 by a predetermined height. Since the shape, material, size, thickness, and shape of the second substrate 121 may be formed similarly to the first substrate 101, description thereof will be omitted. Hereinafter, the first substrate 101 will be omitted. The difference between the second substrate 121 will be described below.

The second substrate 121 is formed to be contacted with a pillar 125 formed on the first substrate 101 to be spaced a predetermined height apart. The fillers 125 are formed at four corner regions of the first substrate 101 to support the second substrate 121.

Here, the filler formed in the short-circuit area to be described below among the fillers 125 is formed of a conductor material, and serves as a passage through which the first substrate 101 and the second substrate 121 can be electrically connected to each other. Do it. The short circuit region will be described in detail later with reference to FIG. 3.

The second antenna 130 includes a second antenna carrier 131 and a second antenna radiator 132. The second antenna carrier 131 is formed on one side of the second substrate 121 on the upper portion of the first substrate 101, and is formed in a direction perpendicular to the arrangement direction of the first antenna carrier 111. do.

Like the first antenna 110, the second antenna 130 may be implemented to perform wireless communication in multiple bands. For example, as described above, the second antenna 130 may perform wireless communication in a high frequency band or a low frequency band. Can be.

In addition, the antenna device 100 may be embedded in an external USB dongle, and when embedded in an external USB dongle, the antenna device 100 may be formed at the other end of the first substrate 101 to be combined with a USB port of an external electronic device. It may further include a USB interface unit 140 that can be.

Meanwhile, according to an embodiment of the present invention, a short circuit region is formed in the first substrate 101 and the second substrate 121. Details of the short circuit region will be described later with reference to FIG. 3.

As described above, the antenna device 100 configured to short-circuit the first substrate 101 and the second substrate 121 in the short-circuit area, the ground plane 103 formed on the first substrate 101 and the The ground plane 123 formed on the second substrate 121 is electrically connected. As a result, the ground planes 103 and 123 formed in the antenna device 100 are expanded, thereby increasing the efficiency of the first antenna 110 and the second antenna 130.

3 illustrates short-circuit areas S1, S2, S3, and S4 to be measured for each location to form an optimal short-circuit area in consideration of antenna efficiency in the antenna device according to an exemplary embodiment of the present invention. In one embodiment of the present invention, any of the short-circuit areas is designated as four groups near the edges of the first substrate 101 and the second substrate 121.

The short circuit area is an area for electrically connecting the first substrate 101 and the second substrate 121. The short circuit area S1, S2, S3, and S4 includes the first antenna 110 and the second antenna. The short circuit area for optimizing the efficiency of 130 is selected and formed.

In order to select such a short circuit region, the efficiency of the first antenna 110 and the second antenna 130 is measured for each of the designated short circuit regions S1, S2, S3, and S4.

In order to measure the efficiency of the first antenna 110 and the second antenna 130, the first terminal 151 is formed on the first substrate 101, the second terminal 121 is formed on the second substrate (121) 152). The first terminal 151 is electrically connected to the feed section 113 of the first antenna 110, the second terminal 152 is electrically connected to the feed section 133 of the second antenna 130. Is connected.

Here, the position of the first terminal 151 and the second terminal 152 connected to the first substrate 101 and the second substrate 121 is not limited, and it is appropriate to measure the efficiency of the antenna. The test terminals can be connected in position.

Tables 1 and 2 below show the efficiency of the first antenna 110 and the second antenna 130 for each of the short-circuit areas S1, S2, S3, and S4.

Low frequency band
(LTE, DCN band) First antenna efficiency Second antenna efficiency S1 More than 40% 20% or more none More than 40% below 10 S4 More than 40% below 10 S2 More than 40% below 10 S2, S3 More than 40% below 10

High frequency band
(PCS band) First antenna efficiency Second antenna efficiency S1 20% or more 25% or more none More than 15% 20% or more S4 More than 15% 20% or more S2 More than 15% 20% or more S2, S3 More than 15% 20% or more

Table 1 shows the efficiency of the first antenna 110 and the second antenna 130 in the low frequency band (for example, LTE, DCN band), Table 2 is a high frequency band (for example, PCS Band) shows the efficiency of the first and second antennas 110 and 130.

Here, "none" shown in Tables 1 and 2 is to measure the efficiency of the first antenna 110 and the second antenna 130 without specifying a short-circuit area. That is, the first substrate 101 and the second substrate 121 are not electrically connected.

As shown in Table 1, it can be seen that the efficiency of the first antenna 110 and the second antenna 130 is measured the highest when S1 is a short region in the low frequency band. In addition, as shown in Table 2, it can be seen that the efficiency of the first antenna 110 and the second antenna 130 is measured to be the highest when S1 is a short region in the high frequency band as in the low frequency band.

As such, the reason why the efficiency of the first antenna 110 and the second antenna 130 are measured to be the highest at S1 is that the point S1 of any of the short-circuit areas is the first feed part of the first antenna 110 ( 113) and the second feed part 133 of the second antenna 130 is most spaced apart. The reason for this is described in more detail as follows.

The first feed part 113 is formed in the first antenna 110, and is formed in the vicinity of any short-circuit area S4 adjacent to the first antenna 110 and the second antenna 130.

In addition, the second feeder 133 is formed in the second antenna 130, and is adjacent to any short circuit region S3 adjacent to the other end of the second antenna 130 and the second substrate 121. Is formed.

The efficiency of the first antenna 110 and the second antenna 130 is the first substrate 101 and the second substrate in a region far from the first feed portion 113 and the second feed portion 133. The highest measurement is made when 121 is shorted to each other. This is because when the first substrate 101 and the second substrate 121 are short-circuited in an area far from the first feed part 113 and the second feed part 133, the first antenna 110 and the first feed part 113 and the second feed part 133 are shorted. This is because the isolation between the second antennas 130 is secured to increase the efficiency of the antenna.

In addition, by shorting the first substrate 101 and the second substrate 121 at each point S1, the ground surface 103 formed on the first substrate 101 and the ground formed on the second substrate 121. The surface 123 is connected to have an effect of extending the ground plane formed on the antenna device 100. As such, when the ground plane is extended, an effect of extending the moving path of the current flowing in the antenna device 100 occurs, thereby increasing the efficiency of the antenna.

However, the optimal short region may be changed to any other short region at the point S1. This is because the distance between the feeder and the short-circuit area varies depending on the position of the feeder formed in the antenna device 100. See FIG. 4 to examine this in detail.

Referring to FIG. 4, there is shown an antenna device 400 in which a feeder is located at a different position in the antenna device 100 shown in FIG. 3.

As shown, the first feed part 413 is formed in the first antenna 110 and is located near any short-circuit area S1 adjacent to the first antenna 110 and the second substrate 121. Is formed. In addition, the second feeder 433 is formed in the second antenna 130, and is adjacent to the short circuit region S3 adjacent to the other end of the second antenna 130 and the second substrate 121. Is formed. In this case, when the efficiency of the first antenna 110 and the second antenna 130 for each of the short-circuit area is measured, it is measured highest in any of the short-circuit area S2 or S4 region. This is because, as described above, the short-circuit area that is farthest from the first feed part 413 and the second feed part 433 is the S2 or S4 area.

3 and 4, the short-circuit area of the antenna device according to the embodiment of the present invention may be specified differently according to the position of the power supply unit constituting the antenna device.

As described above, according to an embodiment of the present invention, by short-circuiting the double substrate in the region farthest from the feeding part of each antenna, isolation between antennas constituting the antenna device is secured in the low frequency band, and the ground plane is also extended. This increases the efficiency of the antenna.

On the other hand, as shown in Table 1 and Table 2, the efficiency of the antenna appears lower than the low frequency band in the high frequency band, which is a signal flowing in the first substrate 101 and the second substrate 131 in the high frequency band This is because phase inversion occurs between signals.

Here, an inductor may be used to maintain the efficiency of the antenna even in a high frequency band. Therefore, the antenna device in which the inductor is formed will be described below.

5 is a plan view showing an antenna device according to another embodiment of the present invention.

Referring to FIG. 5, the ground plane of the second substrate 521 is spaced apart from the first ground plane 523 and the first ground plane 523 formed in the short-circuit area, and is disposed on one surface of the second substrate 521. A second ground plane 524 formed. In this case, as in the exemplary embodiment illustrated in FIG. 3, the shorting region is assumed to be an optimal shorting region for shorting the S1 region between the first substrate 501 and the second substrate 521.

Here, an inductor is formed between the first ground plane 523 and the second ground plane 524 between the first ground plane 523 and the second ground plane 524 formed in the short circuit area of the second substrate 521. 560 is formed in contact.

The inductor 560 extends the ground plane of the antenna device 500 by electrically connecting the ground plane of the first substrate 501 and the ground plane of the second substrate 521 in the low frequency band. On the other hand, in the high frequency band, the ground plane of the first substrate 501 and the ground plane of the second substrate 521 are blocked from being electrically connected, thereby blocking the signal in the high frequency band.

The inductor 560 may be set such that the ground plane of the first substrate 501 and the ground plane of the second substrate 521 are electrically connected in the low frequency band, and the first substrate 501 in the high frequency band. The ground plane of and the ground plane of the second substrate 521 may be set not to be electrically connected. For example, the value of the inductor 560 may be set in a range of about 8.2 nH (nano Henry). However, in another embodiment of the present invention, the value of the inductor 560 is not limited, and it will be apparent to those skilled in the art that various design changes may be made in consideration of the frequency radiated from the antenna device 500.

As described above, the inductor is inserted between the spaced ground planes of the second substrate to reduce the phase difference due to the ground plane extension effect due to the coupling effect in the low frequency band and the open effect in the high frequency band. As described above, the efficiency of the antenna improved accordingly will now be described in detail.

FIG. 6 is a graph measuring the efficiency of the first antenna in the high frequency band and the low frequency band, and FIG. 7 is a graph measuring the efficiency of the second antenna in the high frequency band and the low frequency band. 6 and 7, the X axis (horizontal axis) represents a numerical value of a frequency band in MHz, and the Y axis (vertical axis) represents a numerical value of antenna efficiency based on 100%.

6 and 7 also show the efficiency of the antenna in each frequency band when the first substrate 101 and the second substrate 121 are shorted in the short region. The red square represents the efficiency of the antenna in each frequency band when the first substrate 101 and the second substrate 121 are opened. Finally, the triangular shape of the yellow line shows the efficiency of the antenna in the antenna device 500 in which the inductor is formed in the short-circuit area.

First, referring to FIG. 6, which shows the efficiency of the first antenna, a band below 800 MHz is determined as a low frequency band based on about 800 MHz, and a band above 800 MHz is determined as a high frequency band.

As shown in FIG. 6, it can be seen that the efficiency of the first antenna 110 in the high frequency band is lower than the efficiency of the first antenna 110 in the low frequency band. As described above, this occurs due to the phase reversal between the first substrate 101 and the second substrate 121 when the first antenna 110 operates in the high frequency band from the low frequency band. However, it can be seen that the efficiency of the first antenna 110 in which the inductor 560 is formed in the short region is improved in the high frequency band and the low frequency band, respectively.

That is, as shown in FIG. 6, in the high frequency band of 1850 MHz to 1990 MHz, the efficiency of the first antenna 110 is 20 when the first substrate 101 and the second substrate 121 are shorted or opened. While measuring from% to 45%, it can be seen that the efficiency of the first antenna 110 forming the inductor 560 is measured from 45% to 50%. As such, by forming the inductor in the antenna device, the efficiency of the first antenna 110 is improved in the high frequency band.

Next, referring to FIG. 7, the efficiency of the second antenna is shown. Based on about 800 MHz, the band below 800 MHz is determined as the low frequency band, and the band above 800 MHz is determined as the high frequency band.

As shown in FIG. 7, when the first substrate 101 and the second substrate 121 are shorted in the high frequency band and the low frequency band, the efficiency of the second antenna 130 is measured to be high while the first substrate is measured. When the substrate 101 and the second substrate 121 are opened, the efficiency of the second antenna 130 is measured to be low. That is, it can be seen that the difference in efficiency between the second antenna 130 when the first substrate 101 and the second substrate 121 are short-circuited and when opened is large.

However, the efficiency of the second antenna 130 in which the inductor 560 is formed in the short-circuit area is measured by a value in which the difference between both the low frequency band and the high frequency band is compromised, and above all, of the second antenna 130 in the high frequency band. It can be seen that the efficiency is improved.

That is, as shown in FIG. 7, in the high frequency band of 1850 MHz to 1990 MHz, the efficiency of the second antenna 130 is 28% to 28% when the first substrate 101 and the second substrate 121 are short-circuited. While measured at 32%, it can be seen that the efficiency of the second antenna 130 forming the inductor 560 is measured at 38% to 40%.

Therefore, as shown in FIG. 6 and FIG. 7, according to an embodiment of the present invention, in the antenna device for transmitting and receiving signals at a multi-band frequency, each antenna is mounted on a separate dual board, and then By determining the optimum short-circuit area in consideration of the efficiency of the antenna and short-circuit the double board, it is possible to improve the antenna efficiency by improving the isolation between the antennas.

In addition, by forming an inductor in an optimal short-circuit area, the ground plane is extended in the low frequency band to extend the current path flowing inside the antenna device, and in the high frequency band, the phase inversion difference of the signal flowing between the dual substrates is reduced, thereby reducing the By improving the isolation, the efficiency of the antenna can be improved.

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 construed as limiting the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is an internal perspective view showing an internal configuration of an antenna device according to an embodiment of the present invention.

Figure 2 is a side view showing the side of the antenna device according to an embodiment of the present invention.

3 is a plan view showing an arbitrary short-circuit area to form a short-circuit area in the antenna device according to an embodiment of the present invention.

4 is a plan view showing an arbitrary short-circuit area to form a short-circuit area in the antenna device according to another embodiment of the present invention.

5 is a plan view showing an antenna device according to another embodiment of the present invention.

6 and 7 are graphs showing the efficiency of the antenna device according to an embodiment of the present invention.

Claims (8)

A first substrate; A first antenna that transmits and receives signals in a multiple frequency band and is electrically connected to a ground plane of the first substrate; A plurality of fillers formed on the first substrate and spaced apart from each other; A second substrate formed on the plurality of pillars and spaced apart from the first substrate by a predetermined height; And, A second antenna that transmits and receives signals in multiple frequency bands and is electrically connected to a ground plane of the second substrate; Including; Any one of the plurality of fillers is formed of a conductor to electrically connect the ground plane of the first substrate and the ground plane of the second substrate. The method of claim 1, The conductor filler, The antenna device is formed in a region that is the longest distance from the feed section of the first antenna and the feed section of the second antenna. The method of claim 1, The ground plane of the first substrate and the ground plane of the second substrate, An antenna device electrically connected to each other via the conductor filler. The method of claim 3, The second substrate, A first ground plane electrically connected to the conductor filler on one surface of the second substrate; A second ground plane formed spaced apart from the first ground plane on the second substrate; And, An inductor connecting the first ground plane and the second ground plane It includes, an antenna device. The method of claim 4, wherein The inductor is, In the low frequency band of the signals of the multi-frequency band, the first ground plane and the second ground plane is set to be electrically connected, And the first ground plane and the second ground plane are not electrically connected in the high frequency band. The method of claim 1, The first antenna, The antenna device is formed in one end of the first substrate is bonded to the first substrate. The method of claim 1, The second antenna, The antenna device is formed on one side of the second substrate in the upper portion of the first substrate, and formed in a direction perpendicular to the arrangement direction of the first antenna. The method of claim 1, The antenna device, And an USB interface unit formed on the first substrate and coupled to a USB port of an external electronic device.

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