KR101691081B1 - Antena for use in a portable terminal and a portable terminal including same - Google Patents

Abstract

The present invention provides an antenna device of a portable terminal and a portable terminal including the antenna device, in which resonance frequency and impedance of an antenna formed of a segmented metal rim can be easily changed. According to the present invention, there is provided a portable terminal comprising: a metal frame mounted on a case frame of the portable terminal, the metal frame being divided into a first part and a second part; A circuit board disposed in the case frame, the circuit board having a feed part for supplying electric current and a ground plane; And a ground matching unit, wherein the first part of the metal rim is connected to the feed part, one side of the feed part is grounded by the ground plane, and the second part is grounded by the ground plane And both ends of the ground matching unit are connected to the ground plane.

Description

TECHNICAL FIELD [0001] The present invention relates to an antenna device for a portable terminal and a portable terminal including the antenna device. [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a portable terminal and a portable terminal including the antenna device, and more particularly to an antenna device of a portable terminal including a metal frame arranged in a case frame of the terminal and a portable terminal .

2. Description of the Related Art Portable terminals, such as smart phones, mobile phones, tablet computers, navigation systems, and electronic timepieces, can generally be easily carried by anyone and conveniently used anywhere. In addition, in order to enhance the appearance of the portable terminal, a metal frame is often used for the case frame.

However, in such a metal frame, a current flowing to the antenna of the terminal can be induced, which degrades the performance of the antenna, for example, the radiation performance. Therefore, a structure that can apply such a metal frame to the case frame is limited. To alleviate this problem, a method of segmenting a metal frame so that a part of the metal frame works as an antenna is used.

In addition, in the antenna of such a terminal, PCB pattern change, matching element change, or side ground contact point change are used to adjust the resonance characteristics, but other methods except the matching element change require much time and cost.

In addition, when the segmented metal frame is used as an antenna, the adjacent segmented metal frame deteriorates the radiation performance of the antenna.

Korean Patent Laid-Open Publication No. 10-2012-O117048 (Apr. 14, 2011) Korean Patent Publication No. 10-2014-0119928 (Apr.

Embodiments of the present invention are intended to provide an antenna device of a portable terminal that can easily change the resonance frequency and impedance of an antenna formed of segmented metal rims.

In addition, embodiments of the present invention provide an antenna device of a portable terminal capable of suppressing a phenomenon that impedes the radiation performance of an antenna formed of a metal frame with a remaining metal frame other than the segmented metal frame forming the antenna, .

However, the technical problem to be solved by the present invention is not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a portable terminal including: a metal frame mounted on a case frame of the portable terminal, the metal frame being divided into a first part and a second part; A circuit board disposed in the case frame, the circuit board having a feed part for supplying electric current and a ground plane; And a ground matching unit, wherein the first part of the metal rim is connected to the feed part, one side of the feed part is grounded by the ground plane, and the second part is grounded by the ground plane And both ends of the ground matching unit are connected to the ground plane.

Wherein the power feeding section is connected to a first region of the ground plane through a first connection wiring line and the second part is connected to a second region of the ground plane via a second connection wiring line, Region and the second connection wiring, or between the first region and the second region on the side connected to the second connection wiring.

The both ends of the ground matching unit may be disposed with the power feed portion interposed therebetween when viewed in a plan view.

The ground matching unit may include a first contact structure connected to the first region, a second contact structure connected to the second connection wiring, and a bridge connecting the first contact structure and the second contact structure have.

The lumped elements may be connected to the bridge in series or in parallel.

The ground plane may further include a third region between the first region and the second region, and the ground matching unit may further include a branch connecting the third region and the bridge.

The lumped elements may be connected to the branch in series or in parallel.

According to another aspect of the present invention, there is provided a portable terminal including an antenna device, the antenna device including: a metal frame mounted on a case frame of the portable terminal, the metal frame being divided into a first part and a second part; A circuit board disposed in the case frame, the circuit board having a feed part for supplying electric current and a ground plane; And a ground matching unit, wherein the first part of the metal rim is connected to the feed part, one side of the feed part is grounded by the ground plane, and the second part is grounded by the ground plane And both ends of the ground matching unit are connected to the ground plane.

1 is a schematic partial plan view of an antenna device of a portable terminal according to an embodiment of the present invention;
2 is a schematic partial perspective view of an antenna device of a portable terminal according to an embodiment of the present invention,
3 is a schematic partial plan view of an antenna device of a portable terminal according to another embodiment of the present invention,
FIG. 4A is a graph showing the performance of the conventional antenna device, FIG. 4B is a graph showing the performance of the antenna device according to the embodiment of the present invention,
FIG. 5A is a graph comparing the antenna performance when the inductor is used as a lumped element on the bridge path of the ground matching unit according to the embodiment of the present invention and when there is no lumped element, FIG. 5B, Is a graph comparing the performance of an antenna when a capacitor is used as a lumped element on a bridge path of a ground matching unit according to an embodiment of the present invention and when there is no lumped element.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. 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.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for effectively explaining the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

FIG. 1 is a schematic partial plan view of an antenna device of a portable terminal according to an embodiment of the present invention, and FIG. 2 is a partial perspective view of an antenna device of a portable terminal according to an embodiment of the present invention.

As shown in the figure, the antenna device of the portable terminal according to the embodiment of the present invention is disposed in a side wall of a frame case (not shown) of a portable terminal such as a smart phone, for example, Metal frames 11 and 12 separated into a first part 11 and a second part 12, a circuit board 17 disposed inside the frame case, and a ground matching unit 16.

The first part 11 of the metal rims 11 and 12 can be connected to the feeding part 15 of the circuit board 17 so as to function as an antenna. The second part 12 of the metal rims 11 and 12 can be connected to the second area 32 of the ground plane 13 of the circuit board 17 via the connection wiring 14 so as to function as a ground. The first part 11 and the second part 12 are separated from each other and are not directly connected.

The feeder 15 and the ground plane 13 are formed on the circuit board 17 and the feeder 15 can be connected to the first part 11 of the metal frame. The power feeder 15 may be connected to a duplexer (not shown) on the circuit board 17 and the like. The feed portion 15 may be connected to the first region 31 of the ground plane 13 via the first connection wiring 24. [ A concentration device, for example, a capacitor, an inductor, or the like may be disposed on the path of the connection wiring 24.

A ground plane 13 is formed on the circuit board 17. The ground plane 13 includes a first region 31 connected to the feed portion 15 through a first connection wiring 24, A second region 32 connected to the second part 12 through the second region 14 and a third region 33 disposed between the first region 31 and the second region 32 . The ground plane 13 has a partially recessed shape when viewed as a whole, and no grounding is formed in such a recessed portion on the substrate 17.

The second region 12, the second connection wiring 14, the second region 32, the third region 33, the first region 31, the first connection wiring 24 ), The feed part 15 and the first part 11 may be formed by bypassing the recessed part of the ground plane 13.

The ground matching unit 16 is provided between the first region 31 and the second connection wiring 14 or between the second region 32 connected to the first region 31 and the second connection wiring 14 You can connect. 2, a first contact structure 19 is formed on the first region 31 so as to protrude from the ground plane 13, and a second contact structure 20 (20) is formed on the second connection wiring 14, May be formed to protrude from the ground plane 13 and a bridge 18 connecting the first contact structure 19 and the second contact structure 20 may be formed. In addition, the concentration devices 21 may be arranged in series or in parallel on the bridge 18, and the concentration devices 21 may be exchanged or adjusted.

In the present embodiment, the ground matching unit 16 is formed three-dimensionally, but the present invention is not limited thereto, and may be a two-dimensional planar structure or may be formed on the inside or the opposite surface of the circuit board 17 .

1 and 2, the ground matching unit 16 may be formed across an indented portion of the ground plane 13, but is not limited thereto. At this time, it may be formed so as to cross the feed part 15 formed on the recessed part of the ground plane 13. That is, the ground matching unit 16 may be formed so as to intersect when viewed in a plan view, without being electrically connected to the feed unit 15. [ In this case, an insulating layer may be formed between the ground matching unit 16 and the feed unit 15, or the ground matching unit 16 may be formed on the substrate 17, As shown in FIG.

3 is a schematic partial plan view of an antenna device of a portable terminal according to another embodiment of the present invention. 3, the antenna device of the portable terminal according to another embodiment of the present invention is different from the antenna device of the portable terminal according to the embodiment of the present invention shown in Figs. 1 and 2 in that the branch 25 ). That is, the ground matching unit 16b of the antenna device of the portable terminal according to another embodiment includes a bridge 18 connecting the first region 31 of the ground plane 13 and the second connection wiring 14, And a branch 25 connecting the bridge region 18 and the third region 33.

The ground matching unit 16b may be a three dimensional structure and may in this case be connected to the third region 33 via a third contact structure 23 formed to protrude on the third region 33.

3, the branch 25 is formed as a three-dimensional structure spaced apart from the surface of the circuit board 17, but is not limited thereto, and may be formed on or in the surface of the circuit board 17, Or may be formed on another surface. Also, as shown in the drawing, the lumped elements 21a may be arranged in series or in parallel on the path of the branch 25, and the lumped elements 21a may be exchanged or adjusted.

Further, the branch 25 may be formed so as to overlap with the feed part 15 formed in the indented part in a side-by-side direction. That is, the branch 25 may be formed at a position where it is overlapped when viewed in a plan view, without being electrically connected to the feed part 15. In this case, an insulating layer may be formed between the branch 25 and the feeding part 15, or an insulating layer may be formed between the branch 25 and the feeding part 15, or the branch 25 may be formed on or spaced apart from the substrate 17, .

4 is a graph showing the performance (Fig. 4 (a)) of the antenna apparatus of the conventional portable terminal without the ground matching unit and the performance of the antenna apparatus of the portable terminal including the ground matching unit according to the embodiment of the present invention (b)).

As shown in FIG. 4 (a), in the conventional antenna device, the resonance point is downward, the in-band efficiency is -8 dB or more, and the radiation efficiency is-1.3 dB or more. On the other hand, in the case of the antenna device of the portable terminal according to the embodiment of the present invention, the applied resonance frequency adjustment and the impedance adjustment can be performed as shown in FIG. 4B, the efficiency of the antenna is improved, Band characteristics were improved. In addition, the in-band efficiency is more than -2.5 dB and the radiation efficiency is more than -0.25 dB, which is improved by about 1 dB compared to the case where the ground matching unit is not used. In addition, as described above, frequency change and resonance characteristics adjustment are easy.

5 shows the case where an inductor (Fig. 5A) and a capacitor (Fig. 5B) are arranged on the path of the bridge 18 as a lumped element in the ground matching unit, In comparison with the performance of FIG.

As shown in Fig. 5 (a), when the inductor is used as the lumped element (S1,1), the band frequency can be shifted, and the band frequency not existing can be generated, Can be improved.

As shown in FIG. 5 (b), when a capacitor is used as a lumped element (S1,1), the band frequency width can be widened and the antenna efficiency can be improved.

As described above, the present invention has been described with reference to the embodiments. However, it will be apparent to those skilled in the art that various modifications may be made without departing from the technical spirit of the present invention.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Therefore, the scope of the present invention should not be limited to the scope of the present invention, but extends to the scope of the claims and their equivalents.

11: Part 1 of the metal rim
12: Part 2 of the metal rim
13: Ground plane
14: second connection wiring
15:
16; 16a; 16b: ground matching unit
17: circuit board
18: Bridge
19: First contact structure
20: Second contact structure
23: Third contact structure
24: first connection wiring
25: Branch
31: first region of the ground plane
32: second area of the ground plane
33: third area of the ground plane

Claims (8)

A metal frame mounted on a case frame of the portable terminal, the metal frame being divided into a first part and a second part;
A circuit board disposed in the case frame, the circuit board having a feed part for supplying electric current and a ground plane; And
A ground matching unit,
Wherein the first part of the metal rim is connected to the feed part, one side of the feed part is grounded by the ground plane, the second part is grounded by the ground plane,
Wherein both ends of the ground matching unit are connected to the ground plane and are disposed with the power feeder interposed therebetween.
The method according to claim 1,
Wherein the power supply unit is connected to the first area of the ground plane through a first connection wiring, the second part is connected to a second area of the ground plane through a second connection wiring,
Wherein the ground matching unit connects between the first region and the second connection wiring or between the first region and the second region on the side connected to the second connection wiring.
delete The method of claim 2,
Wherein the ground matching unit comprises a first contact structure connected to the first region, a second contact structure connected to the second connection wiring, and a bridge connecting the first contact structure and the second contact structure, Antenna device of a portable terminal.
The method of claim 4,
And the loudspeaker is connected to the bridge in series or in parallel.
The method of claim 4,
Wherein the ground plane further comprises a third region between the first region and the second region,
Wherein the ground matching unit further comprises a branch connecting the third region and the bridge.
The method of claim 6,
And the lumped elements are connected in series or in parallel in the branch.
A portable terminal including an antenna device,
The antenna device includes:
A metal frame mounted on a case frame of the portable terminal, the metal frame being divided into a first part and a second part;
A circuit board disposed in the case frame, the circuit board having a feed part for supplying electric current and a ground plane; And
A ground matching unit,
Wherein the first part of the metal rim is connected to the feed part, one side of the feed part is grounded by the ground plane, the second part is grounded by the ground plane,
Wherein both ends of the ground matching unit are connected to the ground plane and are disposed with the power feeder interposed therebetween.

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