WO2016159540A1 - Antenna apparatus and mobile terminal having same - Google Patents

Abstract

An antenna apparatus and a mobile terminal having the same are disclosed. The antenna apparatus according to one embodiment of the present invention is an antenna apparatus that is mounted on a mobile terminal, wherein one or more parts of a conductive edge structure that is divided into a plurality of parts are used as an edge antenna, and that comprises: a substrate arranged inside of the mobile terminal and on which a first power supply line for supplying current to the edge antenna is formed; and a coupling structure including an emission part that is coupling-fed by current branched from the first power supply line, wherein the phase of the current supplied to the emission part is delayed compared to the current supplied to the edge antenna.

Description

Antenna device and mobile terminal having same

Embodiments of the present invention relate to antenna technology, and more particularly, to an antenna device and a mobile terminal having the same.

Mobile terminals, for example, wearable devices such as smart phones, mobile phones, tablet computers, navigation, smart watches, etc. are generally widely portable and can be conveniently used anywhere, and thus their use is greatly expanded. In addition, in order to enhance the exterior design of such a mobile terminal, a metal frame is increasingly used in the case frame.

However, the current flowing through the antenna of the terminal can be induced in the metal frame, thereby degrading the performance of the antenna, for example, radiation performance. Therefore, the structure in which the metal frame can be applied to the case frame is limited, and in order to alleviate such a problem, a method of segmenting the metal frame to operate a part of the metal frame as an antenna is used.

When a part of the metal frame is used as an antenna, a method of changing a PCB pattern, a matching element, or changing a mechanical contact point is used to adjust the resonance characteristics of the metal frame antenna. Because the frequency bandwidth cannot be satisfied, a separate antenna is used in addition to the metal frame antenna.

For example, when the basic frequency band of the metal frame antenna is 700 ~ 900 MHz, in order to satisfy the bandwidth of 1.7 ~ 2.7 GHz required in the mobile terminal, a separate antenna is used in the 2.3 ~ 2.7 GHz band. That is, the 1.7 to 2.2 GHz band can cover the multiplied frequency band of the metal rim antenna by the resonance frequency adjustment through PCB pattern change and matching element change, but in the 2.3 ~ 2.7 GHz band, interference occurs at the resonance synthesis point. Therefore, it cannot be covered with a metal frame antenna, so a separate antenna is used. Therefore, a separate feed cable, a feed structure, and the like for supplying current to a separate antenna are required.

An embodiment of the present invention is to provide an antenna device that can implement wideband while simplifying the internal structure of a mobile terminal and a mobile terminal having the same.

An antenna device according to an embodiment of the present invention is an antenna device in which at least one part of a plurality of segmented conductive border structures is mounted to a mobile terminal used as a border antenna, which is provided inside the mobile terminal, and the edge A substrate on which a first feed line for supplying current to the antenna is formed; And a radiating part coupled and fed by a current branching from the first feed line, wherein the current supplied to the radiating part includes a coupling structure whose phase is delayed compared to a current supplied to the edge antenna.

The coupling structure may include a base member provided inside the mobile terminal; A second feed line provided on one surface of the base member and through which a current branched from the first feed line flows; And a phase adjuster provided on the other surface of the base member and supplied to the radiator provided on the other surface of the base member by delaying a phase of a current flowing along the second feed line.

The phase adjusting unit may include: a coupling unit provided on the other surface of the base member so as to correspond to the second feed line and generate coupling with the second feed line; And a phase delay part provided between the coupling part and the radiating part on the other side of the base member and transferring the phase coupled current from the coupling part to the radiating part.

The current branched from the first feed line and supplied to the radiator may have a first phase delay in the coupling part and a second phase delay in the phase delay part.

The second feed line and the coupling part may be provided on the substrate at the base member.

The base member may be provided spaced apart from the substrate by a predetermined height.

The antenna device may further include a connection portion provided below the base member and electrically connecting the second feed line and the first feed line.

At least one of the radiating unit and the phase adjusting unit may be electrically connected to the ground of the substrate.

The edge antenna is provided to transmit and receive a first frequency band and a second frequency band higher than the first frequency band, and the coupling structure is configured to be higher than the second frequency band through resonance synthesis with the edge antenna. It may be provided to transmit and receive three frequency bands.

Antenna device according to another embodiment of the present invention, the base member provided inside the mobile terminal; A second feed line provided on one surface of the base member and branched from a first feed line for supplying current to an antenna provided at a conductive edge of the mobile terminal; Radiating portion provided on the other surface of the base member; A coupling part provided on the other surface of the base member to generate a coupling with the second feed line; And a phase delay part provided between the coupling part and the radiating part on the other side of the base member, and delaying a current coupled by the coupling part to the radiating part.

According to an aspect of the present invention, there is provided a mobile terminal comprising: a conductive edge structure segmented into a plurality of parts and at least one part used as an edge antenna; A substrate on which a first feed line for supplying current to the edge antenna is formed; And a radiating part coupled and fed by a current branching from the first feed line, wherein the current supplied to the radiating part includes a coupling structure whose phase is delayed compared to a current supplied to the edge antenna.

According to an embodiment of the present invention, by providing a coupling structure coupled with the current branched from the feed line for supplying the antenna current of the conductive frame structure, through the resonance synthesis between the coupling structure and the antenna of the conductive frame structure Broadband becomes possible. At this time, the coupling structure does not have a separate feed cable and feed structure, it is possible to simplify the internal structure of the mobile terminal, thereby reducing the number of parts.

1 is a plan view of the inside of the coupling structure is omitted in the mobile terminal according to an embodiment of the present invention

2 is a plan view of the inside of the coupling structure in the mobile terminal according to an embodiment of the present invention

3 is a schematic internal cross-sectional view of a mobile terminal according to an embodiment of the present invention;

4 is a graph comparing return loss S 11 before and after mounting a coupling structure in a mobile terminal according to an embodiment of the present invention.

5 is a schematic internal cross-sectional view of a mobile terminal according to another embodiment of the present invention;

Hereinafter, an embodiment of an antenna device of the present invention and a mobile terminal having the same will be described in detail with reference to FIGS. 1 to 5. However, this is only an exemplary embodiment 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. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

The technical spirit of the present invention is determined by the claims, and the following embodiments are merely means for efficiently explaining the technical spirit of the present invention to those skilled in the art to which the present invention pertains.

In addition, in the specification of the present invention, the expressions of the first, second, third, etc. are only referred to to distinguish different components or frequency bands, and are not limited to the order, and in the detailed description and claims of the present invention. The names may not match.

1 and 2 are schematic diagrams illustrating an internal plan view of a mobile terminal according to an embodiment of the present invention. For convenience of description, FIG. 1 illustrates a state without the coupling structure 106, and FIG. 2 illustrates a state with the coupling structure 106. 3 is a schematic internal cross-sectional view of a mobile terminal according to an embodiment of the present invention.

Referring to FIG. 1, the mobile terminal 100 may include a conductive border structure 102, a substrate 104, and a coupling structure 106. The mobile terminal 100 may be a smartphone, a mobile phone, a tablet computer, a laptop, a netbook, a PDA, a PMP, an MP3 player, a navigation system, a smart camera, an electronic dictionary, a smart watch, a wearable device, or the like. It may include various types of mobile communication device.

The conductive edge structure 102 may be provided along the edge of the frame case (not shown) of the mobile terminal 100. The conductive edge structure 102 may be provided in a plurality of segments. Here, although the case in which the conductive edge structure 102 is divided into two parts of the first part 111 and the second part 113 is illustrated, the present invention is not limited thereto, and the conductive edge structure 102 is divided into three or more parts. May be The conductive border structure 102 may serve to beautify the appearance of the mobile terminal 100. The conductive edge structure 102 may be made of a material having electrical conductivity such as, for example, metal.

The first part 111 of the conductive edge structure 102 may be used as an antenna. Hereinafter, the first part 111 is also referred to as a "border antenna". The first part 111 may be provided to emit electromagnetic waves by receiving a current from the substrate 104. The first part 111 may be provided to transmit and receive signals of the first frequency band and the second frequency band. For example, the first part 111 may be provided to transmit and receive a first frequency band of 700 to 900 MHz and a second frequency band of 1.7 to 2.2 GHz band. Here, the first frequency band (for example, 700 to 900 MHz) may be a basic resonance frequency band of the first part 111. In addition, the second frequency band (for example, 1.7 to 2.2 GHz) may adjust the multiplication frequency band of the first frequency band by resonant frequency adjustment (for example, by changing a circuit pattern of the substrate 104 or by changing a matching element). It may be a tuned frequency band. However, the present invention is not limited thereto, and the second frequency band may be a multiplication frequency band of the first frequency band. The second part 113 may be electrically connected to the ground 121 of the substrate 104. The first part 111 and the second part 113 are provided to be spaced apart from each other.

The substrate 104 is provided inside the mobile terminal 100. That is, the substrate 104 is provided inside the frame case (not shown). The substrate 104 may be a main board of the mobile terminal 100, but is not limited thereto. The substrate 104 may be provided with a region where a ground 121 is formed and a region where a non-ground 123 is formed. In the non ground 123, a first feed line 125 may be formed to supply a current to the first part 111 used as an antenna. One end of the first feed line 125 may be connected to the first part 111, and the other end of the first feed line 125 may be spaced apart from the ground 121. The current may be supplied from the other end side of the first feed line 125 to flow along the first feed line 125 to the first part 111. Feed points 129 may be provided at the other end of the first feed line 125. In the non-ground 123 region, a branch transmission line 127 branching from the first feed line 125 may be provided.

The coupling structure 106 may include a base member 131, a second feed line 133, a phase adjuster 135, and a radiator 137.

The base member 131 may be an insulating member having a predetermined thickness. As the base member 131, for example, a printed circuit board (PCB), a flexible printed circuit board (FPCB), a carrier, or the like may be used, but is not limited thereto. The base member 131 may be provided spaced apart from the substrate 104 by a predetermined height. In this case, a base member (not shown) supporting the base member 131 may be provided below the base member 131. However, the present invention is not limited thereto, and the base member 131 may be attached to an inner surface of the case of the mobile terminal 100 (that is, a surface facing the inside of the mobile terminal 100) and spaced apart from the substrate 104 by a predetermined height. .

The base member 131 may be formed parallel to the upper frame of the mobile terminal 100 at the upper portion of the non-ground 123 area of the substrate 104, and then bent toward the side frame side of the mobile terminal 100. However, the present invention is not limited thereto, and the shape of the base member 131 may be variously changed according to the structure of the mobile terminal 100.

The second feed line 133 may be provided on the bottom surface of the base member 131. The second feed line 133 may be provided at an upper portion of the non-ground 123 area on the bottom surface of the base member 131. One side of the second feed line 133 may be electrically connected to the branch transmission line 127. In detail, since the base member 131 is spaced apart from the substrate 104 by a predetermined height, the connecting portion 141 is provided between the second feed line 133 and the branch transmission line 127 to provide the second feed line 133. The branch transmission line 127 may be electrically connected. As the connection unit 141, for example, a C clip or a fog pin may be used, but is not limited thereto. Here, when the current is supplied from the other end side of the first feed line 125, the supplied current is branched to the branch transmission line 127, the branched current is the second feed line 133 through the connection portion 141 Will flow to the side.

Here, the branch transmission line 127 branching from the first feed line 125 is provided in the non-ground area 123 of the substrate 104, and the second feed line 133 branches the transfer through the connecting portion 141. Although described as being electrically connected to the line 127, the present invention is not limited thereto, and the second feed line 133 may be directly connected to the first feed line 125 through the connection unit 141 without providing the branch transmission line 127. May be electrically connected to the

The phase adjuster 135 may be provided on an upper surface of the base member 131. The phase adjuster 135 changes the phase of the current flowing along the second feed line 133 and serves to supply the radiator 137. The phase adjuster 135 may delay the phase of the current flowing along the second feed line 133 and supply the delayed phase to the radiator 137. Here, since the phase of the current flowing along the second feed line 133 is the same as the phase of the current flowing along the first feed line 125, the phase of the current supplied to the radiator 137 is the first part 111. Delayed than the phase of the current supplied to. As described above, the phase of the current supplied to the radiator 137 is delayed than the phase of the current supplied to the first part 111, so that an environment suitable for resonance synthesis between the first part 111 and the radiator 137 is provided. This composition allows broadband to be made possible. The phase adjuster 135 may delay the phase of the current flowing along the second feed line 133 to the radiator 137 by delaying 180 degrees (or λ / 2), for example, but is not limited thereto.

The phase adjuster 135 may include a coupling unit 135-1 and a phase delay unit 135-2. The coupling part 135-1 may be provided to correspond to the second feed line 133 on the upper surface of the base member 131. The coupling part 135-1 is electromagnetically coupled to the second feed line 133. That is, when current flows along the second feed line 133 provided on the bottom surface of the base member 131, the base member 131 is formed by coupling between the second feed line 133 and the coupling unit 135-1. A current flows through the coupling part 135-1 provided on the upper surface of the coupling part. The coupling unit 135-1 and the second feed line 133 may be provided so that coupling occurs at an upper portion of the non-ground 123 region. In this case, the influence of the ground 121 of the substrate 104 can be minimized.

Here, since the base member 131 is spaced apart from the substrate 104 by a predetermined height, the coupling efficiency between the second feed line 133 and the coupling unit 135-1 may be improved. In addition, when the base member 131 uses a thin material such as FPCB, the coupling loss can be reduced when the second feed line 133 and the coupling part 135-1 are coupled to each other.

When the coupling occurs between the second feed line 133 and the coupling unit 135-1, the current flowing through the coupling unit 135-1 generates a phase delay compared to the current flowing through the second feed line 133. Done. Here, the coupling unit 135-1 of the coupling unit 135-1 may generate a 90 degree (or λ / 4) phase delay compared to the current flowing in the second feed line 133. At least one of the length and the line width may be adjusted, but is not limited thereto.

The phase delay unit 135-2 may be provided between the coupling unit 135-1 and the radiating unit 137 on the upper surface of the base member 131. One end of the phase delay unit 135-2 may be connected to the coupling unit 135-1, and the other end of the phase delay unit 135-2 may be connected to the radiation unit 137. The phase delay unit 135-2 may delay the current flowing through the coupling unit 135-1 and transmit the phase delay to the radiator 137. The phase delay unit 135-2 may be configured to delay the current flowing through the coupling unit 135-1, for example, by 90 degrees (or λ / 4) in phase length and line width. At least one may be adjusted, but is not limited thereto.

That is, in the current branched from the first feed line 125 and transferred to the second feed line 133, the first phase delay occurs in the coupling unit 135-1, and the phase delay unit 135-2 is generated. A second phase delay occurs at and is transmitted to the radiator 137. For example, when the first phase delay of 90 degrees occurs in the coupling unit 135-1 and the second phase delay of 90 degrees occurs in the phase delay unit 135-2, the radiating unit 137 is supplied to the radiator 137. The current has a phase delay of 180 degrees compared to the current branched from the first feed line 125.

The radiating part 137 may be provided on an upper surface of the base member 131. The radiator 137 is connected to the phase adjuster 135. The radiator 137 receives the coupling feed by the phase adjuster 135 generating the coupling with the second feed line 133. The radiator 137 may be provided to transmit and receive a signal of a third frequency band through resonance synthesis with the first part 111. For example, the radiator 137 may be provided to transmit and receive a third frequency band in the 2.3 to 2.7 GHz band through resonance synthesis with the first part 111.

Here, the current supplied to the radiator 137 has a phase delay suitable for resonant synthesis by the phase adjuster 135 compared to the current supplied to the first part 111, thereby minimizing interference at the resonant synthesis point. As a result, resonance occurs in a desired frequency band (ie, a third frequency band).

As described above, in the exemplary embodiment of the present invention, the coupling structure includes a coupling structure 106 which is coupled with a current branched from the first feed line 125 for supplying current to the first part 111 to receive power. Broadband can be achieved through resonant synthesis of the 106 and the first part 111. For example, the first part 111 transmits and receives signals in the first frequency band and the second frequency band, and the coupling structure 106 transmits and receives the third frequency band adjacent to the second frequency band, thereby providing a second frequency. Widening from the band to the third frequency band is possible. Here, the coupling structure 106 does not have a separate feed cable and feed structure, it is possible to simplify the internal structure of the mobile terminal 100, thereby reducing the number of parts.

Meanwhile, although the base member 131 is described as being spaced apart from the substrate 104 by a predetermined height, the present invention is not limited thereto, and the base member 131 may be provided on the substrate 104. In this case, the second feed line 133 may be provided on the bottom surface of the base member 131 or may be provided on the substrate 104.

4 is a graph comparing return loss S 11 before and after mounting a coupling structure according to an embodiment of the present invention.

Referring to FIG. 4, the reflection loss S 11 before mounting the coupling structure 106 inside the mobile terminal 100 (that is, when only the first part 111 is present) is described. It can be seen that resonance occurs at 700 to 900 MHz (that is, the first frequency band) which is the basic resonance frequency of 111. The resonance frequency may be adjusted by adjusting the multiplication frequency band of the first frequency band to generate resonance at 1.7 to 2.2 GHz (that is, the second frequency band). However, it can be seen that the mobile terminal 100 does not generate resonance in the third frequency band (for example, 2.3 to 2.7 GHz) required for communication such as Long Term Evolution (LTE) or Bluetooth.

On the contrary, when the coupling structure 106 is mounted inside the mobile terminal 100 (that is, when the first part 111 and the coupling structure 106 are present), the reflection loss S 11 is described. It can be seen that resonance occurs not only in the first frequency band (700 to 900 MHz) and the second frequency band (1.7 to 2.2 GHz) but also in the third frequency band (2.3 to 2.7 GHz). That is, resonance occurs in the third frequency band through resonance synthesis of the first part 111 and the coupling structure 106, and thus resonance occurs in the band of 1.7 to 2.7 GHz so that wideband can be realized. do.

Table 1 is a table comparing the antenna performance before and after mounting the coupling structure according to an embodiment of the present invention in the mobile terminal.

	Before mounting	After mounting	compare
Freq. [MHz]	Avg. [DBi]	Avg. [DBi]	Avg. [DBi]
698	-5.24	-4.84	0.40
746	-5.00	-4.73	0.27
824	-11.07	-10.41	0.66
849	-12.48	-11.69	0.79
869	-12.29	-12.14	0.15
894	-12.94	-12.24	0.70
...	...	...	...
1710	-6.20	-6.46	-0.26
1785	-5.14	-5.26	-0.12
1805	-4.55	-4.70	-0.15
1850	-5.01	-5.26	-0.25
1880	-4.86	-4.81	0.05
1910	-4.39	-4.53	-0.14
1920	-4.69	-4.85	-0.16
1930	-4.49	-5.05	-0.56
1980	-4.67	-5.43	-0.76
1990	-5.02	-5.46	-0.44
2110	-4.37	-5.27	-0.90
2170	-3.52	-4.26	-0.74
2300	-4.30	-3.43	0.87
2350	-6.92	-4.18	2.74
2400	-7.76	-4.83	2.93
2496	-12.82	-7.62	5.20
2635	-17.41	-7.50	9.91
2690	-17.29	-6.44	10.85

Referring to Table 1, in the 2.3 to 2.7 GHz band, the antenna performance after mounting the coupling structure 106 inside the mobile terminal 100 is to mount the coupling structure 106 inside the mobile terminal 100. It can be seen that it is superior to the previous antenna performance.

5 is a schematic internal cross-sectional view of a mobile terminal according to another embodiment of the present invention. Here, the parts that differ from the embodiments shown in FIGS. 2 and 3 will be mainly described.

Referring to FIG. 5, the coupling structure 106 may be electrically connected to the ground 121 of the substrate 104 for impedance matching. For example, the radiating part 137 provided on the upper surface of the base member 131 may be provided to be electrically connected to the ground 121. To this end, a via hole 143 penetrating the base member 131 may be formed in the base member 131. The conductive material may be filled in the via hole 143. In addition, a connection portion 145 may be provided between the base member 131 and the ground 121 under the via hole 143. In this case, the radiating part 137 provided on the upper surface of the base member 131 is electrically connected to the ground 121 through the via hole 143 and the connecting part 145. A portion of the radiating part 137 may be provided on the ground 121 on the upper surface of the base member 131.

Here, the radiator 137 is described as being electrically connected to the ground 121, but the present invention is not limited thereto, and the phase adjuster 135 may be electrically connected to the ground 121. In addition, the radiator 137 and the phase adjuster 135 may be electrically connected to the ground 121, respectively.

Although the present invention has been described in detail with reference to exemplary embodiments above, those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. 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.

Claims (11)

1. An antenna device mounted to a mobile terminal in which at least one part of a plurality of segmented conductive edge structures is used as an edge antenna,

   A substrate provided in the mobile terminal and having a first feed line configured to supply current to the edge antenna; And

   And a radiating part coupled and fed by current branching from the first feed line, wherein the current supplied to the radiating part includes a coupling structure whose phase is delayed relative to the current supplied to the edge antenna.
2. The method according to claim 1,

   The coupling structure,

   A base member provided inside the mobile terminal;

   A second feed line provided on one surface of the base member and through which a current branched from the first feed line flows; And

   And a phase adjuster provided on the other surface of the base member and supplied to the radiator provided on the other surface of the base member by delaying a phase of a current flowing along the second feed line.
3. The method according to claim 2,

   The phase adjustment unit,

   A coupling part provided on the other surface of the base member so as to correspond to the second feed line and generate coupling with the second feed line; And

   And a phase delay part provided between the coupling part and the radiating part on the other side of the base member, the phase delay part delaying a current coupled by the coupling part to the radiating part.
4. The method according to claim 3,

   The current branched from the first feed line and supplied to the radiating unit is

   And a first phase delay in the coupling section and a second phase delay in the phase delay section.
5. The method according to claim 2,

   The second feed line and the coupling unit,

   And an antenna device provided above the substrate in the base member.
6. The method according to claim 2,

   The base member,

   An antenna device provided spaced apart from the substrate by a predetermined height.
7. The method according to claim 6,

   The antenna device,

   And a connection part provided below the base member and electrically connecting the second feed line and the first feed line.
8. The method according to claim 2,

   At least one of the radiator and the phase adjustment unit,

   An antenna device electrically connected to the ground of the substrate.
9. The method according to claim 1,

   The edge antenna is provided to transmit and receive a first frequency band and a second frequency band higher than the first frequency band.

   And the coupling structure is provided to transmit and receive a third frequency band higher than the second frequency band through resonance synthesis with the edge antenna.
10. A base member provided inside the mobile terminal;

    A second feed line provided on one surface of the base member and branched from a first feed line for supplying current to an antenna provided at a conductive edge of the mobile terminal;

    Radiating portion provided on the other surface of the base member;

    A coupling part provided on the other surface of the base member to generate a coupling with the second feed line; And

    And a phase delay part provided between the coupling part and the radiating part on the other side of the base member, the phase delay part delaying a current coupled by the coupling part to the radiating part.
11. A conductive edge structure segmented into a plurality and having at least one part used as an edge antenna;

    A substrate on which a first feed line for supplying current to the edge antenna is formed; And

    And a radiating part coupled and fed by current branching from the first feed line, wherein the current supplied to the radiating part includes a coupling structure whose phase is delayed relative to a current supplied to the edge antenna.

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