KR102093480B1 - Antenna apparatus - Google Patents

Abstract

The present invention relates to an antenna device, the antenna device is located on the first surface of the substrate, the first pattern portion having a feed terminal at one end, and the body of the body located on the opposite side of the first surface It includes a second pattern portion located on two sides and having a switching portion connection terminal at one end.

Description

Antenna device {ANTENNA APPARATUS}

The present invention relates to an antenna device, and more particularly, to an antenna device having a double-sided symmetrical structure.

In the case of an antenna used in a mobile device such as a smart phone, a PIFA-type antenna device (Planar Inverted F Antenna) is mainly used for multi-band service.

However, as the communication environment of mobile devices has recently evolved into Long Term Evolution (LTE), all “LTE” bands cannot be satisfied using a PIFA-type antenna device, which adversely affects smooth communication operation.

In addition, due to the high density of electronic devices, there is a shortage of space required for the design of the antenna device, which causes many difficulties in designing the antenna device.

Republic of Korea Registered Patent No. 10-1798779 (Announcement date: November 16, 2017, title of invention: PIFA antenna for UWB) Republic of Korea Registered Patent No. 10-1075010 (Announcement date: October 19, 2011, title of the invention: an isotropic metal-attached tag antenna having a PIA structure)

The problem to be solved by the present invention is to increase the frequency bandwidth of the antenna device and improve communication efficiency.

Another problem to be solved by the present invention is to reduce the space required for the antenna device.

An antenna device according to one aspect of the present invention for solving the above problems is located on a substrate, a first surface of the substrate, a first pattern portion having a feed terminal at one end, and the opposite side of the first surface It includes a second pattern portion located on the second surface of the substrate and having a switching portion connection terminal at one end.

The antenna device according to the feature may further include a switching unit having one side connected to the switching unit connection terminal, and a plurality of matching circuits having one side connected to the other side of the switching unit and the other side connected to ground.

The antenna device according to the feature may further include a shunt element having one side connected to ground, and the first pattern portion or the second pattern portion further includes a shunt terminal connected to the other side of the shunt element. can do.

At least a portion of the first pattern portion may be positioned to overlap at least a portion of the second pattern portion with the substrate interposed therebetween.

The first pattern part may further include a first extension part connected to the feed terminal and extending to the other end of the first pattern part, and the second pattern part is connected to the switching part connection terminal and the second pattern A second extension portion extending to the other end of the portion may be further included, and the extension lengths of the first extension portion and the second extension portion may be different from each other.

The feed terminal and the switching terminal connection terminal may be located on different surfaces with the substrate interposed therebetween.

The feed terminal and the switching terminal connection terminal may be located on the same surface of the substrate and spaced apart from each other.

The first extension portion and the second extension portion may each include at least one of a straight portion, a curved portion, a curved portion, and a branched portion.

The substrate may be a case, a flexible printed circuit board or a rigid printed circuit board.

The substrate may have a dielectric constant.

The first pattern portion and the second pattern portion may be made of a conductive material.

According to these features, since the first pattern portion and the second pattern portion are located on the first and second surfaces of the substrates opposite to each other, the antenna device is miniaturized, and the formation of the first pattern portion and the second pattern portion is performed. The size of the room for is greatly reduced.

In addition, since at least a portion of the first pattern portion and the second pattern portion overlap with the substrate interposed therebetween, since the capacitor is formed in the overlapping portion of the overlapped first pattern portion and the second pattern portion, the first pattern portion and the second pattern It is possible to adjust the frequency bandwidth of the antenna device using a negative overlap area.

Therefore, as the first pattern portion and the second pattern portion are formed on different surfaces, the area of formation of the first pattern portion and the second pattern portion formed on each surface can be easily increased, so that the capacitance size of the capacitor can be easily increased. By easily increasing the frequency bandwidth of the antenna device, broadband transmission and reception of wireless signals is easily achieved. Therefore, transmission / reception performance of the antenna device is improved.

In addition, since a separate shunt element is connected through the shunt terminal, it is easy to adjust the range of the frequency band of the antenna device.

In addition to this, since the switching unit is connected to the switching unit selecting one of the plurality of matching circuits through the connection terminal, the impedance size connected to the antenna unit is selectively adjusted. Therefore, since the size of the resonance frequency of the antenna device) is easily changed as necessary, the effectiveness and reliability of operation of the antenna device are improved.

1 is a perspective view of an antenna device according to an embodiment of the present invention.
FIG. 2 is a plan view of the antenna device shown in FIG. 1.
3 is a rear view of the antenna device shown in FIG. 1.
4 is a cross-sectional view of the antenna device illustrated in FIG. 1 taken along line IV-IV.
5A to 5G are views exemplarily showing various forms of the first extension part and the second extension part in an antenna device according to an embodiment of the present invention.
6 is an equivalent circuit diagram when a shunt element is connected through a shunt terminal of an antenna device according to an embodiment of the present invention.
7 is an equivalent circuit diagram when a plurality of matching circuits and a switching unit are connected through a switching unit connection terminal of an antenna device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that adding a detailed description of a technology or configuration already known in the art may obscure the gist of the present invention, some of them will be omitted from the detailed description. In addition, the terms used in the present specification are terms used to properly express the embodiments of the present invention, which may vary according to persons or practices related to the field. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

The terminology used herein is only to refer to a specific embodiment and is not intended to limit the invention. The singular forms used herein include plural forms unless the phrases clearly indicate the opposite. As used herein, the meaning of 'comprising' embodies certain properties, regions, integers, steps, actions, elements and / or components, and other specific properties, regions, integers, steps, actions, elements, components and / or groups. It does not exclude the existence or addition of.

Next, an antenna device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The antenna device 100 of this example includes a substrate 10, a first pattern portion 20 positioned on a first surface of the substrate 10, and a second pattern portion 30 positioned on a second surface of the substrate 10. It is provided.

At this time, the first pattern unit 20 and the second pattern unit 30 form an antenna unit 50 for transmitting and receiving radio signals to and from the antenna device 100 of the present invention.

The substrate 10 is a plastic resin containing a printed circuit board (PCB) such as a flexible printed circuit board (FPCB) or a rigid printed circuit board (rigid PCB) or an antenna device 100 of this example and containing spinel additives. It may be an inner case of an electronic device made of an insulating material such as ash, and may have a dielectric constant of a predetermined size in some cases.

At this time, the case may be an injection material formed through an injection process.

The first pattern part 20 located on the first surface (eg, the upper surface or the outer surface) of the substrate 10 is a feeding part that feeds a radio signal generated from a high frequency generator (not shown), etc. , The second pattern portion 30 located on the second surface (eg, the lower surface or the inner surface) of the substrate 10 may be a ground portion connected to the ground.

At this time, the first surface and the second surface of the substrate 10 are located opposite to each other, facing each other. In this example, the first surface of the substrate 10 is an upper surface and the second surface is a lower surface, but is not limited thereto and may be opposite.

Accordingly, the first pattern portion 20 and the second pattern portion 30 are disposed in parallel to each other in the opposite direction with the substrate 10 interposed therebetween.

Each of the first pattern portion 20 and the second pattern portion 30 is made of a conductive material such as copper (Cu) or gold (Au), and printed in various forms on the corresponding surface of the substrate 10 It has a pattern.

Further, the first pattern portion 20 and the second pattern portion 30 may be plating layers formed through a plating process.

At this time, at least a portion of the first pattern portion 20 and at least a portion of the second pattern portion 30 overlap each other with the substrate 10 therebetween.

The first pattern unit 20 includes a feed terminal 211 and a first pattern unit connected to one end of the first pattern unit 20 for connection of the transceiver 80 for transmitting and receiving wireless signals. 20) is connected to a portion of the shunt terminal (shunt terminal) 212 and the feed terminal 211 is extended to the other end of the first pattern portion 20 (hereinafter referred to as the 'first connection' Extension part ') (22).

As described above, the feed terminal 211 is a terminal connected to a terminal of the transceiver 80, through which the first extension 22 transmits a radio signal applied from the transceiver 80 through the feed terminal 211 Receive and transmit to the outside, the transceiver 80 applies a wireless signal received from the outside through the first extension (22).

The shunt terminal 212 is a passive element such as a resistor, capacitor, and inductor, such as a shunt inductor, which is connected in parallel to the first extension line 22 or the second extension 32 (eg, a shunt element) ). The shunt terminal 212 may be located on the same surface of the feed terminal 211 and the substrate 10.

At this time, when the other end of the passive element that is not connected to the shunt terminal 212 is connected to the ground, the ground pattern located on the substrate 10 is not located on the same surface (eg, the first surface) of the shunt terminal 212 If not, a via hole (not shown) may be located on the substrate 10. Therefore, the shunt terminal 212 in this example may be connected to one side of a passive element located on the other side through a via hole. Thus, when the antenna terminal 100 of the present example is connected to the shunt element by the shunt terminal 212, the equivalent circuit of the antenna device 100 is as shown in FIG.

In the case of Fig. 6, the shunt element is an inductor L1 as an example. As described above, when the antenna device 100 includes the shunt element L1, the matching operation of the frequency band is more easily performed, so that the range of the frequency band can be easily adjusted.

The first extension portion 22 is printed and extended on a corresponding surface of the substrate 10 in various forms, and an overlapping portion overlapping the second pattern portion 30 (hereinafter, this overlapping portion is referred to as a 'first overlapping portion') And a non-overlapping portion (hereinafter, this non-overlapping portion is referred to as a 'first non-overlapping portion') 222.

The second pattern portion 30 is similarly connected to one end of the second pattern portion 30 for connection with ground, a switching portion connection terminal (eg, a third terminal) 31 and a switching portion connection terminal 31 ), And an extension portion (hereinafter, referred to as an 'second extension portion') 32 extending to the other end of the second pattern portion 30.

The antenna device 100 of this example is provided with a plurality of matching circuits 61-64, as shown in FIG. 7, and the switching unit 70 for selecting one of the plurality of matching circuits 61-64 Be equipped.

Each matching circuit (61-64) is for adjusting the magnitude of the impedance to adjust the phase of the antenna signal output from the antenna unit 50, the matching circuit (61-64b0) has a different size of impedance.

Each of the matching circuits 61-64 is composed of at least one passive element among elements (eg, resistors, capacitors, and inductors) having at least one of a resistive component, a capacitive component, and an inductive component.

Alternatively, each matching circuit 61-64 may adjust the impedance size using a stub to control the phase size of the antenna unit 50.

Accordingly, each matching circuit 61-64 may include a passive element having at least one of a resistive component, a capacitive component, and an inductive component, or may have a stub.

For this reason, the size of the impedance of each matching circuit 61-64 is determined by the size of the passive element or the state of the stub provided in each matching circuit 61-64, and the phase and amplitude of the connected antenna unit 50 are connected. It is determined according to the impedance size of the matching circuit (61-64).

As illustrated in FIG. 7, the switching unit 70 is connected between the antenna unit 50 and each matching circuit 61-64, and selects one of a plurality of matching circuits 61-64 to provide an antenna unit 50. And the matching circuits 61-64 selected.

The switching unit 70 is provided with a plurality of switches (71-74) connected to each matching circuit (61-64), the on / off state of these switches (71-74) is a control applied from the outside It is determined according to the signal CS1.

Accordingly, the state of the switch 71-74 is controlled to select one of the plurality of matching circuits 61-64, and the antenna unit 50 and the selected matching circuit 61-64 are connected.

The switching unit 70 may be formed of a relay or an RF switch.

Accordingly, the switching unit connection terminal 31 is a connection terminal that is connected to the other end of each switch 41-74, to which one end is connected, as shown in FIG. 7.

Due to the switching connection terminal 31, the phase change of the wireless signal output from the antenna unit 50 is easily selected by selecting one of the plurality of matching circuits 61-64, so that the resonance of the antenna unit 50 is achieved. Since the size of the frequency is more easily changed, the matching operation of the wireless signal is also more easily performed. Due to this, the reliability of the antenna device 100 according to the present example is improved.

In an alternative example, one of the shunt terminal 212 and the switching unit connection terminal 31 may be omitted, in this case, a shunt element or matching circuit 61-64 and switching connected to the antenna device 100 The part 70 is also omitted.

The second extension portion 32 is also printed and extended on the corresponding surface of the substrate 10 in various forms similar to the first extension portion 22, and overlaps with the first pattern portion 20 (hereinafter, This overlapping portion is referred to as a 'second overlapping portion') 321 and a non-overlapping portion not overlapping with the first pattern portion 20 (hereinafter, this non-overlapping portion is referred to as a 'second non-overlapping portion') ( 322).

At this time, at least one of the first and second extension portions 22 and 32 may not have a non-overlapping portion.

Accordingly, the first and second overlapping portions 221 and 321 positioned on the first and second pattern portions 20 and 30 are positioned at the same position with the substrate 10 interposed therebetween, so that the heights are different but flat. It is located in the same position, that is, the position in the z-axis direction (height direction) is different, but it is located in the same position in the x-axis (horizontal direction) and y-axis direction (vertical direction).

At this time, as shown in Figure 1, the feed terminal 211 and the switching unit connection terminal 31 are located on different surfaces of the substrate 10 and are spaced apart in a corresponding direction (eg, a horizontal direction) by a predetermined distance, It can be located on the same surface in a plane while being located on different surfaces.

In addition, in another alternative example, the feed terminal 211 and the switching part connection terminal 31 may be positioned to be spaced apart by a predetermined distance on the same side of the substrate 10.

They are located on the same side of each other, for example, on the first side of the substrate 10 and are spaced apart in a corresponding direction (eg, a horizontal direction) by a predetermined distance.

However, in another example, the feed terminal 211 and the switching part connection terminal 31 may be positioned to be overlapped or non-overlapping with the substrate 10 interposed therebetween. And planarly positioned at different locations.

In addition, the first and second extension portions 22 and 32 of the first pattern portion 20 and the second pattern portion 30 extend in the same direction so as to overlap each other with the substrate 10 interposed therebetween. It can be extended longer. In this case, one of the first pattern portion 20 and the second pattern portion 30 is positioned longer than the other ends of the first pattern portion 20 and the second pattern portion 30.

Thus, as an example, in the case of FIG. 1, the second extension portion 32 of the second pattern portion 30 extends longer than the first extension portion 22 of the first pattern portion 20 and is second. The other end of the extension 32 is positioned longer in the extension direction than the other end of the first extension 32. For this reason, the other end of the first extension part 32 and the other end of the second extension part 32 are positioned at different positions in a plane even when the substrate 10 is interposed therebetween.

In addition, the first extension portion 22 and the second extension portion 32 are at least one of a curved line and a straight line and extend in various forms along a corresponding direction.

For example, as shown in FIG. 5, at least one of the first extension portion 22 and the second extension portion 32 is a straight portion SP (Fig. 5 (a)) or a curve extending in the corresponding direction. Portion RP (Fig. 5 (b)), a bent portion CP extending in one direction and then switched in the other direction (Fig. 5 (c)), and a branching portion CBP branching from one portion OBP1-OBP3) (FIGS. 5 (e) to (g)).

The branching portions CBP and OBP1-OBP3 have both rectangular and circular ring shapes (CBP) with both ends of the branching portions connected to the corresponding portions, as shown in FIG. 5 (d), or (e) to (5) to (5). As in g), one end is connected to the branch, and the other end is not connected anywhere, and may have an open shape (OBP1-OBP3).

In addition, the open portion of the branch portion (OBP1-OBP3) is a straight or curved curved shape (OBP1, OBP2) (Fig. 5 (e) and (f)) or a straight portion without a curved portion (OBP3) [Fig. 5 (G)].

Accordingly, at least one of these portions ((a) to (g) of FIG. 5) forms the first and second overlapping portions 221 and 321 of the first and second extension portions 22 and 32, or the first And second non-overlapping portions 222 and 322.

As described above, when the first pattern portion 20 and the second pattern portion 30 made of a conductive material sandwich the substrate 10 having a dielectric constant therebetween, at least a portion overlaps in the opposite direction, and the first pattern portion 20 overlaps each other. The first overlapping portion 221 of the first pattern portion 20 and the second overlapping portion 321 of the second pattern portion 30 form a capacitor.

At this time, the size of the capacitor, which is the value of the formed capacitor, may be determined according to the overlapping area between the first overlapping portion 221 and the second overlapping portion 321.

As described above, since the capacitor is formed by the first overlapping portion 221 and the second overlapping portion 321 of the first pattern portion 20 and the second pattern portion 30, the size of the capacitance can be changed, so the first By changing the areas of the overlapping portion 221 and the second overlapping portion 321, the antenna device 100 can control the size of the frequency bandwidth of the radio signals that can be transmitted and received.

Therefore, the antenna device 100 of the present example can easily widen the frequency bandwidth by using the size of the overlapping area of the first overlapping portion 221 and the second overlapping portion 321.

The first pattern portion 20 and the second pattern portion 30 may be formed by a double injection method or a laser direct structing (LDS) method, and are also located on separate circuit boards or an antenna device is mounted as described above. Can be located directly on the case of the corresponding electronic device.

As described above, since the first pattern portion 20 serving as the feeding portion and the second pattern portion 30 serving as the ground portion are positioned on the first surface and the second surface of the substrate 10 opposite to each other, the antenna device 100 is miniaturized. Is made.

That is, since the first pattern part and the second pattern part are located on different surfaces compared to the case where both the first pattern part and the second pattern part are located on the same surface of the substrate 10, the first pattern part and the second pattern part Since the size of the space for formation is greatly reduced, and the formation areas of the first pattern portion and the second pattern portion formed on each corresponding surface are also increased, the performance of the antenna device 100 according to this example is improved.

Further, as at least a portion of the first pattern portion 20 and the second pattern portion 30 overlap with the substrate 10 interposed therebetween, the overlapped first pattern portion 20 and the second pattern portion 20 are overlapped. Since the overlap portion of the function as a capacitor, it is possible to adjust the frequency bandwidth of the antenna device 100 by using the overlapping area of the first pattern portion 20 and the second pattern portion 30. For this reason, the frequency bandwidth of the antenna device 100 according to the present example is easily increased to facilitate wideband.

In addition, since a separate shunt element is connected through the shunt terminal 212, it is easy to adjust the range of the frequency band of the antenna device 100.

In addition, since the switching unit connection terminal 32 is connected to the switching unit 70 selecting one of the plurality of matching circuits 61-64, the impedance size connected to the antenna unit 50 is selectively adjusted. . Because of this, since the size of the resonance frequency of the antenna device 500 is easily changed as necessary, the effectiveness of the antenna device 500 is improved and the reliability of operation is also increased.

The embodiments of the antenna device 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 variations will be possible from the viewpoint of those having ordinary knowledge in the field to which the present invention pertains. Therefore, the scope of the present invention should be defined not only by the claims of the present specification, but also by the claims and equivalents thereof.

100: antenna device 10: substrate
20: 1st pattern part 30: 2nd pattern part
211: feeding terminal 212: shunt terminal
31: switching part connection terminal
22: first extension 32: second extension
221: first overlapping portion 321: second overlapping portion
222: first non-overlapping portion 322: second non-overlapping portion

Claims (11)

Board;
A first pattern portion positioned on a first surface of the substrate; And
A second pattern portion located on the second side of the substrate located on the opposite side of the first side
Including,
The first pattern portion includes a feed terminal connected to one end of the first pattern portion and a first extension portion connected to the feed terminal and extending to the other end of the first pattern portion,
The second pattern portion includes a switching portion connection terminal connected to one end of the second pattern portion and a second extension portion connected to the switching portion connection terminal and extending to the other end of the second pattern portion,
Each of the first extension portion and the second extension portion includes a branch portion,
The branching portion has a ring shape in which the other end of the branching portion is connected to another portion, or has an open shape in which the other end of the branching portion maintains a free end state,
The open branch part has a straight or curved curved shape or a straight shape without a curved portion.
Antenna device. According to claim 1,
A switching unit having one side connected to the switching unit connection terminal; And
A plurality of matching circuits having one side connected to the other side of the switching unit and the other side connected to ground
Antenna device further comprising a. According to claim 1,
Shunt element with one side connected to ground
Further comprising,
The first pattern portion or the second pattern portion further includes a shunt terminal connected to the other side of the shunt element
Antenna device. delete delete According to claim 1,
The feed terminal and the switching unit connection terminal is an antenna device located on different surfaces with the substrate interposed therebetween. According to claim 1,
The feed terminal and the switching terminal connection terminal is located on the same surface of the substrate and spaced apart from each other. delete According to claim 1,
The substrate is an antenna device that is a case, a flexible printed circuit board or a rigid printed circuit board. According to claim 1,
The substrate is an antenna device having a dielectric constant. The method of claim 10,
The first pattern portion and the second pattern portion is an antenna device made of a conductive material.

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