KR101843471B1 - Antenna and communication terminal including the same - Google Patents

Abstract

According to an embodiment of the present invention, an antenna comprises: a ground substrate; a radiation pattern arranged on one side of the ground substrate, and having a feeding point receiving a feeding signal formed thereon; a loop pattern separated from the radiation pattern, and arranged on the other side of the ground substrate; and a first capacity device or a first inductive device connected between the loop pattern and the ground substrate, and adjusting a resonance frequency of the loop pattern.

Description

ANTENNA AND COMMUNICATION TERMINAL INCLUDING THE SAME [0001]

Technical Field The present invention relates to an antenna and a communication terminal including the same, and more particularly, to an antenna including a loop pattern disposed at an end of a ground substrate and spaced apart from a radiation pattern and capable of adjusting a resonance frequency, Terminal.

Recently, built-in antennas have been applied to portable communication terminals. In the case of the portable communication terminal, the size thereof is limited because the portability must be ensured, thereby limiting the size of the built-in antenna included in the portable communication terminal.

Accordingly, there is a need for an antenna structure capable of ensuring desired communication characteristics within a limited size.

Technical Solution According to an aspect of the present invention, there is provided an antenna and a communication terminal including the antenna. The antenna includes a loop pattern spaced apart from a radiation pattern and disposed at an end of a ground substrate, To provide a terminal.

According to an aspect of the present invention, there is provided an antenna comprising: a ground substrate; a radiation pattern disposed on one side of the ground substrate, the radiation pattern being formed with a feed point to receive a feed signal; And a first capacitive element or a first inductive element connected between the loop pattern and the ground substrate to adjust a resonant frequency of the loop pattern.

According to an exemplary embodiment, the loop pattern may be connected to an end of the other side of the ground substrate.

According to an exemplary embodiment, the first capacitive element or the first inductive element may connect one end of the loop pattern to the ground substrate.

According to an exemplary embodiment, the antenna may further include a second capacitive element or a second inductive element that connects the other end of the loop pattern and the ground substrate.

According to an exemplary embodiment, the first capacitive element or the first inductive element may have a symmetrical structure with the second capacitive element or the second inductive element.

According to an exemplary embodiment, the radiation pattern may include a third capacitive element for adjusting the input impedance of the antenna.

According to an exemplary embodiment, the third capacitive element may be formed in a parallel structure in the radiation pattern.

According to an exemplary embodiment, the resonant frequency of the ground substrate may match the resonant frequency of the loop pattern adjusted by the first capacitive element or the first inductive element.

A communication terminal including an embedded antenna according to an aspect of the present invention is characterized in that the built-in antenna includes a grounding substrate, a radiation pattern disposed on one side of the grounding substrate and having a feeding point provided with a feeding signal, A first capacitive element which is spaced apart from the radiation pattern and is disposed on the other side of the ground substrate and is connected between the loop pattern and the ground substrate to adjust a resonance frequency of the loop pattern; 1 inductive element.

According to an exemplary embodiment, the loop pattern may be connected to an end of the other side of the ground substrate.

According to an exemplary embodiment, the resonant frequency of the ground substrate may match the resonant frequency of the loop pattern adjusted by the first capacitive element or the first inductive element.

The antenna according to the technical idea of the present invention and the communication terminal including the antenna according to the technical idea of the present invention may have a separate radiation pattern on one side of the ground substrate and a loop pattern capable of adjusting the resonance frequency on the end of the ground substrate, It is possible to secure a desired frequency band in the grounding substrate of Fig.

Further, the antenna according to the technical idea of the present invention and the communication terminal including the same have the effect of having excellent radiation efficiency in a wide band.

BRIEF DESCRIPTION OF THE DRAWINGS A brief description of each drawing is provided to more fully understand the drawings recited in the description of the invention.
1 is a view illustrating a structure of an antenna according to an embodiment of the present invention.
2 is a view illustrating a structure of an antenna according to another embodiment of the present invention.
FIG. 3 is a view showing a design example according to an embodiment of the antenna shown in FIG. 2. FIG.
FIG. 4 is a graph illustrating changes in input impedance due to inductance adjustment of the first tuning element and the second tuning element in the antenna of FIG. 2 and FIG. 3;
FIG. 5 is a graph showing changes in reflection coefficient according to inductance control of the first tuning element and the second tuning element in the antenna of FIG. 2 and FIG. 3;
FIG. 6 is a graph showing changes in the reflection coefficient according to the capacitance adjustment of the third tuning element in the antenna of FIG. 2 and FIG. 3;
FIG. 7 is a graph showing changes in reflection coefficient according to the adjustment of the length of the radiation pattern in the antenna of FIG. 2 and FIG. 3;
8 is a graph showing the return loss and the bandwidth in the antennas of FIGS. 2 and 3. FIG.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. However, it should be understood that the technical idea of the present invention is not limited to the specific embodiments but includes all changes, equivalents, and alternatives included in the technical idea of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0027] In the following description of the present invention, a detailed description of known technologies will be omitted when it is determined that the technical idea of the present invention may be unnecessarily obscured. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

Also, the terms "to", "to", "to", "to" and "module" in the present specification mean a unit for processing at least one function or operation, Software. ≪ / RTI >

It is to be clarified that the division of constituent parts in this specification is merely a division by each main function of each constituent part. That is, two or more constituent parts to be described below may be combined into one constituent part, or one constituent part may be divided into two or more functions according to functions that are more subdivided. In addition, each of the constituent units described below may additionally perform some or all of the functions of other constituent units in addition to the main functions of the constituent units themselves, and that some of the main functions, And may be carried out in a dedicated manner.

Hereinafter, exemplary embodiments of the present invention will be described in detail.

1 is a view illustrating a structure of an antenna according to an embodiment of the present invention.

1, an antenna 100 includes a ground substrate 110, a radiation pattern 120, a loop pattern 130, and tuning units 140-1 and 140-2. . ≪ / RTI >

According to an embodiment, the antenna 100 is implemented as an internal antenna of a communication terminal, and can be used for signal transmission / reception of a communication terminal.

The ground substrate 110 may provide a ground voltage to various elements included in a communication terminal in which the antenna 100 is embedded. According to an embodiment, the ground substrate 110 may be comprised of a conductive metal material.

The radiation pattern 120 may be implemented in the form of a patch on the ground substrate 110. The structure of the radiation pattern 120 may be a monopole antenna structure, a loop antenna structure, a ground radiated antenna (Gradiant) structure, a planar inverted F antenna structure And the like.

According to an embodiment, the radiation pattern 120 may be comprised of a conductive metal material, such as the ground substrate 110.

When the radiation pattern 120 is formed as shown in FIG. 1, the radiation part 112 of the ground substrate 110 may be used as a radiator. For example, the antenna 100 may operate as a ground radiating antenna.

The radiation pattern 120 is disposed on one side (e.g., the top) of the ground substrate 110 and the radiation pattern 120 may include a feed point 122 for receiving a feed signal.

The loop pattern 130 may be disposed on the other side of the ground substrate 110, for example, on the opposite side of the region where the radiation pattern 120 is formed. The loop pattern 130 may be connected to the other end of the ground substrate 110.

The loop pattern 130 may be connected to the other end of the ground substrate 110 through the first tuning element 140-1 or the second tuning element 140-2.

According to the embodiment, the loop pattern 130 may be formed in a shape of a 'C' shape with one side opened, and the loop pattern 130 may be formed between the first tuning element 140-1 and the second tuning element 140 2, the loop pattern 130 may form a ring shape together with the ground substrate 110. In this case,

One end of the loop pattern 130 is connected to the ground substrate 110 by the first tuning element 140-1 and the other end of the loop pattern 130 is connected to the second tuning element 140-2, To the ground substrate 110. [0031]

According to the embodiment, the antenna 100 may not include any one of the first tuning element 140-1 or the second tuning element 140-2.

The first tuning element 140-1 may include at least one of a first capacitive element and a first inductive element.

The second tuning element 140-2 may include at least one of a second capacitive element and a second inductive element.

According to the embodiment, the first tuning element 140-1 and the second tuning element 140-2 may have a symmetrical structure with each other.

The resonance frequency of the loop pattern 130 is determined by the first capacitive element or the first inductive element included in the first tuning element 140-1 and the second capacitive element included in the second tuning element 140-2, Or the capacitance or inductance of each of the second inductive elements.

The resonance frequency of the loop pattern 130 is adjusted by the first tuning element 140-1 or the second tuning element 140-2 so that the resonance frequency of the loop pattern 130 is equal to the resonance frequency of the ground substrate 110 And can be designed to match the frequency. In this case, even if the size of the ground substrate 110 is not designed to be larger, the antenna 100 can secure desired communication characteristics, such as high radiation efficiency and wide communication bandwidth.

2 is a view illustrating a structure of an antenna according to another embodiment of the present invention.

Referring to FIGS. 1 and 2, the antenna 100 'according to another embodiment of the present invention further includes a third tuning element 140-3 as compared with the antenna 100 of FIG. 1 can do.

In this case, by adjusting the capacitance of the third tuning element 140-3, the communication characteristics of the antenna 100 ', for example, the input impedance, the resonance frequency, the frequency band, and the like can be designed.

According to the embodiment, the third tuning element 140-3 may be implemented including a third capacitive element. According to another embodiment, the third tuning element 140-3 may be formed in a parallel structure in the radiation pattern 120. [

FIG. 3 is a view showing a design example according to an embodiment of the antenna shown in FIG. 2. FIG.

Referring to FIGS. 2 and 3, the antenna 100 'is designed to have a frequency band of 2.4 to 2.5 GHz, which is a Wi-Fi, Bluetooth band, and the substrate 110 has a size of 20 mm And the loop pattern 130 is formed to have a width of 20 mm and a length of 4 mm.

4 to 8 show the capacitance / inductance variation of the first tuning element 140-1, the second tuning element 140-2, or the third tuning element 140-3 under the above conditions, ) Is shown in a graph.

FIG. 4 is a graph illustrating changes in input impedance due to inductance adjustment of the first tuning element and the second tuning element in the antenna of FIG. 2 and FIG. 3;

Referring to FIGS. 2 to 4, FIG. 4 shows the inductance of each of the first inductive element and the second inductive element included in each of the first tuning element 140-1 and the second tuning element 140-2 7nH, 8nH, and 9nH, respectively, of the input impedance of the antenna 100 '.

FIG. 5 is a graph showing changes in reflection coefficient according to inductance control of the first tuning element and the second tuning element in the antenna of FIG. 2 and FIG. 3;

Referring to FIGS. 2, 3, and 5, FIG. 5 illustrates a first inductive element included in each of the first tuning element 140-1 and the second tuning element 140-2, Represents the reflection coefficient variation of the antenna 100 'when the inductance of the antenna 100' is adjusted to 7 nH, 8 nH, and 9 nH.

FIG. 6 is a graph showing changes in the reflection coefficient according to the capacitance adjustment of the third tuning element in the antenna of FIG. 2 and FIG. 3;

6, when the capacitance of the third capacitive element included in the third tuning element 140-3 is adjusted to 0.35 pF, 0.40 pF, and 0.45 pF, (100 ').

FIG. 7 is a graph showing changes in reflection coefficient according to the adjustment of the length of the radiation pattern in the antenna of FIG. 2 and FIG. 3;

Referring to FIGS. 2, 3, and 7, FIG. 7 shows changes in the reflection coefficient of the antenna 100 'when the length of the radiation portion 112 is adjusted to 17 mm, 18 mm, and 19 mm.

8 is a graph showing the return loss and the bandwidth in the antennas of FIGS. 2 and 3. FIG.

Referring to FIGS. 2, 3, and 8, FIG. 8 illustrates a variation of reflection coefficient of the antenna 100 'according to an embodiment of the present invention when the loop pattern 130 is formed.

The antenna 100 or 100 'according to the embodiment of the present invention can secure a wide bandwidth of about 320 MHz, as shown in FIG. 8, even though the size of the ground substrate 110 is as small as 20 mm in width and 30 mm in length have.

In addition, referring to Table 1 below, the radiation efficiency of the antenna 100 or 100 'according to the embodiment of the present invention is higher than the target frequency of 2.4 to 2.5 GHz, for example, in the range of about 2.3 to 2.6 GHz And exhibits a high radiation efficiency of 50% or more.

Frequency
(MHz) Efficiency
(dB) Efficiency
(%) Peak Gain
(dB) Directivity
(dB) Minimum Gain (dB) Average Efficiency
(dB,%) 2200 -5.15 30.57 -1.33 3.82 -12.35
-2.46dB
(56.71%) 2220 -4.74 33.57 -1.03 3.71 -14.68 2240 -4.56 35.01 -1.21 3.35 -15.39 2260 -3.77 41.95 -0.28 3.49 -16.11 2280 -3.17 48.24 0.33 3.50 -14.74 2300 -2.34 58.37 1.07 3.41 -13.94 2320 -2.03 62.68 1.16 3.19 -13.98 2340 -1.96 63.68 1.21 3.17 -13.59 2360 -2.03 62.73 1.19 3.22 -12.32 2380 -1.82 65.74 1.62 3.45 -9.21 2400 -1.65 68.38 1.62 3.27 -8.95 2420 -1.48 71.12 2.08 3.54 -9.62 2440 -1.25 74.98 2.44 3.69 -10.08 2460 -1.45 71.63 2.28 3.73 -9.40 2480 -1.98 63.40 1.74 3.72 -9.66 2500 -2.27 59.30 1.41 3.68 -9.55 2520 -2.58 55.24 1.01 3.69 -9.75 2540 -2.58 55.16 1.03 3.62 -9.85 2560 -2.43 57.19 1.11 3.54 -9.86 2580 -2.58 55.17 0.92 3.50 -11.48

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the technical scope of the present invention is not limited to the above embodiments but may be modified within the scope of the technical idea of the present invention. Various modifications and variations are possible.

100, 100 ': antenna
110: ground substrate
120: radiation pattern
130: loop pattern
140-1 to 140-3: Tuning element

Claims (11)

An antenna in which a part of a ground substrate operates as a radiator,
A radiation pattern disposed on one side of the ground substrate and having a feeding point for receiving a feeding signal;
A loop pattern spaced apart from the radiation pattern and disposed on the other side of the ground substrate and adapted to adjust a communication characteristic of the antenna and to be opened in one direction; And
And a first capacitive element or a first inductive element connected between the loop pattern and the ground substrate to adjust an impedance of the antenna,
And the radiator constituted by a part of the ground substrate is constituted by an area located above the radiation pattern in a region of the ground substrate.
The method according to claim 1,
In the loop pattern,
And is connected to the other end of the ground substrate.
The method according to claim 1,
Wherein the first capacitive element or the first inductive element comprises:
And connects one end of the loop pattern to the ground substrate.
The method of claim 3,
The antenna includes:
And a second capacitive element or a second inductive element connecting the other end of the loop pattern and the ground substrate.
5. The method of claim 4,
Wherein the first capacitive element or the first inductive element comprises:
The second capacitive element or the second inductive element.
6. The method of claim 5,
The radiation pattern
And a third capacitive element for adjusting an input impedance of the antenna.
The method according to claim 6,
Wherein the third capacitive element comprises:
Wherein the radiation pattern is formed in a parallel structure.
delete A communication terminal including an embedded antenna in which a part of a ground substrate operates as a radiator,
The built-
A radiation pattern disposed on one side of the ground substrate and having a feeding point for receiving a feeding signal;
A loop pattern spaced apart from the radiation pattern and disposed on the other side of the ground substrate to control a communication characteristic of the built-in antenna and to be opened in one direction; And
And a first capacitive element or a first inductive element connected between the loop pattern and the ground substrate to adjust an impedance of the built-in antenna,
Wherein the radiator constituted by a part of the ground substrate is constituted by an area located above the radiation pattern in a region of the ground substrate.
10. The method of claim 9,
In the loop pattern,
And is connected to an end of the other side of the ground substrate.
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