WO2013100607A1

WO2013100607A1 - Miniature antenna apparatus

Info

Publication number: WO2013100607A1
Application number: PCT/KR2012/011528
Authority: WO
Inventors: 이호준
Original assignee: 전자부품연구원
Priority date: 2011-12-29
Filing date: 2012-12-27
Publication date: 2013-07-04
Also published as: CN104025382A; KR101328726B1; KR20130077022A

Abstract

The present invention relates to a miniature antenna apparatus. To this end, the present invention provides a miniature antenna apparatus comprising: an antenna patch surface formed on one substrate surface of the antenna apparatus, for receiving a signal; an antenna fixing surface for attaching an antenna to a miniature electronic device; and a feeder connecting the antenna patch surface to various modules of the miniature electronic device, and relaying a signal received through the antenna patch surface to the miniature electronic device or relaying power supplied from the miniature electronic device to the antenna patch surface.

Description

【Specification】

[Name of invention]

Small antenna unit

Technical Field

The present invention relates to a small antenna device. In particular, the present invention relates to an antenna device that is made compact so that it can be used in a limited space such as a mobile terminal.

Background Art

As the modern society has developed into an information society, a variety of rapid and large-capacity information exchanges have been required. Accordingly, a mobile communication service that can provide information anytime and anywhere has emerged. A variety of mobile communication services are provided, ranging from AMPS (Advanced Mobile Phone System) with analog service, to Wireless Broadband (WiBro), Long Term Evolution (LTE), and Wi-Fi: Wireless Fidelity (WiBro).

As the users of mobile communication services proliferate by the provision of such various mobile communication services, wide frequency bands are required. Accordingly, antennas capable of receiving signals in a wider frequency band are required. In particular, as mobile terminals such as mobile phones, smart phones, and tablet PCs are miniaturized, a small, light and economical antenna is required.

As a method of reducing the size of an antenna inserted into a mobile terminal, a method of grounding using a shorting pin or a substrate having a high dielectric constant is used.

When the grounding method using the shorting pin is used, it is possible to reduce the size of the antenna, but since the additional process is required to manufacture the antenna, the complexity increases, the antenna gain, the efficiency, There is a problem in that antenna characteristics such as bandwidth are deteriorated.

In the case of using a substrate having a high dielectric constant such as a logis substrate or a ceramic substrate, there is a problem in that the cost of manufacturing the antenna increases due to the high price of the substrate. In addition, there is a tendency for the antenna characteristics to deteriorate.

Detailed Description of the Invention

[Technical Challenges]

In order to solve this problem, the technical problem to be achieved by the present invention is to use a relatively easy to obtain substrate, in a limited space, such as a mobile terminal It is to provide a small antenna device that can be used.

Technical Solution

A small antenna device according to an embodiment of the present invention, the antenna device is inserted into the small electronic device, the antenna patch surface formed on one surface of the antenna device for receiving a signal; An antenna fixing surface for attaching the antenna to the small electronic device; And a feeder line connecting the antenna patch surface with various models of the small electronic device, transferring a signal received through the antenna patch surface to the small electronic device, or transferring power supplied from the small electronic device to the antenna patch surface.

[Favorable effect]

According to the present invention, it is possible to manufacture a small antenna having good performance at low cost, thereby efficiently saving not only a mobile terminal such as a mobile phone, a smartphone, a tablet pc, but also a limited space of various small electronic devices such as a game machine and a headset. It can be used.

In addition, as the size of the antenna becomes smaller, it is possible to mount several antennas in one small electronic device. Accordingly, even in the small electronic device, communication using smart antenna technology such as multiple input multiple output (MIMO) is also possible. This has the effect of improving performance.

【Brief Description of Drawings】

1 is a view showing an antenna structure according to an embodiment of the present invention;

2 is a view showing a simulation result according to the main parameter change in the antenna according to an embodiment of the present invention,

Figure 3 is an illustration of a small antenna sample produced according to an embodiment of the present invention, Figure 4 is a view showing the structure of a measuring jig for testing the antenna characteristics according to an embodiment of the present invention,

5 is a graph showing the result of measuring the return loss of the antenna according to the embodiment of the present invention using the measurement jig,

Figure ^'6 is an illustration of a mobile station equipped with an antenna and a test fixture in accordance with an embodiment of the invention,

7 is a diagram illustrating a radiation pattern measured according to an embodiment of the present invention. [Best form for implementation of the invention]

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, the invention may be embodied in many different forms It is not limited to the Example described in the following. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding other components unless specifically stated otherwise. In addition, the "... part" described in the specification The term "unit", "module", etc. refers to a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

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

An antenna 100 according to an embodiment of the present invention includes a substrate 110, an antenna patch surface 120, an antenna fixing surface 130, and a feed line 140.

The substrate 110 is a space in which the antenna patch surface 120, the antenna fixing surface 130, and the feed line 140 are mounted, and various materials such as a flame retardant class 4 (FR4) substrate, a logis substrate, and a ceramic substrate may be used. have. However, in order to achieve the object of the present invention to configure the antenna 100 at a low cost, it is preferable to use a readily available FR4 substrate. In addition, not only the dielectric constant of the dielectric constituting the substrate 110 but also the thickness and the shape are preferably not limited.

The antenna patch surface 120 is disposed on the top surface of the substrate 110 and is connected to the antenna fixing surface 130 positioned on the bottom surface of the substrate 110 through the feed line 140.

Here, in implementing the antenna patch surface 120, it is preferable that there is no restriction on the shape of the pattern used, the line width and the interval between the line widths.

The antenna patch surface 120 illustrated in FIG. 1 is a radiator having a line width of 0.2 GHz and forms a loop shape. At this time, the spacing and length between the line widths affect the coupling between each other. Therefore, it is desirable to determine the spacing between line widths within a range that is not affected by such coupling.

Here, the length of the entire antenna patch surface 120 determines the resonance frequency of the antenna. In addition, since the material of the antenna patch surface 120 changes substrate characteristics such as permittivity and height, it serves as a factor for determining the resonance frequency of the antenna.

The antenna fixing surface 130 is a part for attaching the antenna 100 according to the embodiment of the present invention to a small electronic device such as a mobile terminal. In addition, it serves to secure the antenna 110 to the measuring jig for the test. The antenna fixing surface 130 illustrated in FIG. 1 is implemented on both sides of the lower surface of the substrate 110, and for fixing the antenna to the measuring jig. The solution is implemented in the appropriate size. Here, the antenna fixing surface 130 is implemented as 4mm, 1.7 瞧, spacing 3.6 隱 respectively.

The feed line 140 is a portion for connecting the antenna patch surface 120 located on the upper surface of the substrate 110 with various models of the small electronic device in which the antenna 100 is installed, for the operation of the antenna 110. It is a part that performs power feeding from the power supply models of the small electronic device.

In addition, the feeder line 140 performs a function of transmitting the signal identified through the antenna patch surface 120 to the main processor of the small electronic device.

Here, the feed line 140 is connected to various models of the small electronic device through a via-hole implemented on the bottom surface of the antenna 100.

2 is a view showing a simulation result according to the change of the main parameter in the antenna according to an embodiment of the present invention.

Finite element method (FEM) or finite difference time domain (FDTD) may be used to analyze the patch antenna implemented on the top surface of the antenna 100.

The finite element method separates the finite element into a finite area using various boundary conditions through points, lines, and planes common to the structure of the patch antenna, calculates the representative contact of the area, and uses the governing method of the contact structure. After calculating the system of equations for the whole, a solution is obtained. The finite difference time domain method is a method for solving solutions using differential equations in space and time domains.

In FIG. 2, characteristics of the antenna patch surface 120, which are the main variables of the antenna 100, for each length of the antenna patch surface 120 are analyzed using Ansoft-HFSS.

Here, the simulation results may be used to determine how much the length of each antenna patch surface 120 is affected. That is, as the change in the frequency band is increased through 2C, it can be seen that the antenna performance is responsive according to the length of the inner patch surface located on the left side of the antenna patch surface. Also, as the frequency band change is hardly changed through 2F, the length of the outer patch surface located on both sides of the antenna patch surface does not significantly affect the antenna performance.

Using this simulation result, it is possible to check the optimum condition for each length of the antenna patch surface 120.

3 is an exemplary view of a small antenna sample manufactured according to an embodiment of the present invention.

6 fabricated using the length of antenna patch surface 120 identified through 2A through 2F. The small antenna of X3X1.6 같다 is shown in FIG. 3.

4 is a diagram illustrating a structure of a measuring jig for testing antenna characteristics according to an exemplary embodiment of the present invention.

The measuring jig used to confirm the characteristics of the small antenna sample fabricated as shown in FIG. 3 includes one or more antenna mounting surfaces 410, 420, 430, and 440 and a resultant output stage 450.

The antenna mounting surfaces 410 to 440 are ground planes on which the antenna 100 is fixedly mounted, and may be implemented on one or more substrates 400. In FIG. 4, four antenna mounting surfaces 410 to 440 are implemented on the substrate 400, and each antenna mounting surface is implemented to have a size of 100 × 40 × 1.6 μs.

Here, the antenna 100 is fixedly mounted on the first antenna mounting surface 410, and the resultant output terminal 450 is connected to the fixedly mounted antenna 100.

The result output stage 450 is connected to an external measuring device such as a computer, and performs a function of transferring the measured antenna characteristic value to the external measuring device.

5 is a graph illustrating a result of measuring return loss of an antenna according to an exemplary embodiment of the present invention using a measuring jig.

As a result of measuring S11 using the measurement jig, a result graph as shown in FIG. 5 may be calculated. Here, S11 denotes a return loss generated in the frequency domain of the signal. That is, it may be understood as S11 (0 = V_ref lected (f) / V_incident (f).

As shown in FIG. 5, a bandwidth of about 90 MHz based on a voltage standing wave ratio (VSWR) 2: 1 may be calculated using the measurement result. In this way, the antenna can be calculated by mounting the measurement jig of FIG. 4 to the actual mobile terminal.

6 is an exemplary view of a mobile terminal equipped with an antenna and a measuring jig according to an embodiment of the present invention.

As a result of measuring antenna characteristics in an anechoic chamber using a mobile terminal equipped with an antenna and a measuring jig, the radiation pattern of FIG. 7 can be confirmed.

7 is a diagram illustrating a radiation pattern measured according to an embodiment of the present invention.

The antenna measured in the mobile terminal equipped with the antenna and the measuring jig shows an omni-directional radiation pattern, which may be represented by a three-dimensional radiation pattern as shown in FIG. 7. Table 1 shows the results of the measured antenna efficiency and gain.

Table 1

Using the results in Table 1, we can see that the maximum gain of the antenna is 0.43dBi. In addition, it can be seen that the average gain value (Avg) has a value of -9.62 dBi to -5.77 dBi, and the antenna efficiency can be obtained from 10.92% to 26.48%.

The above-described embodiments of the present invention are not implemented only through the apparatus and the method, but may be implemented through a program or a recording medium on which the program is recorded. Implementation can be easily implemented by those skilled in the art from the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of the invention.

Claims

[Range of request]

[Claim 11

case,

In the mobile communication terminal comprising an antenna provided in the case, the antenna

System 1 antenna for wifi and bluetooth,

In the antenna device inserted into the small electronic device,

An antenna patch surface formed on one surface of the substrate of the antenna device to receive a signal; An antenna fixing surface for attaching the antenna to the small electronic device; And connecting the antenna patch surface with various models of the small electronic device, transmitting a signal received through the antenna patch surface to the small electronic device, or power supplied from the small electronic device to the antenna patch surface. Feeder transmitting

Small antenna device comprising a.

[Claim 2]

The method of claim 1,

The antenna patch surface is,

And a coupling generated according to the line width spacing and length of the antenna patch surface is minimized, and the line antenna spacing corresponding to the length is determined.

[Claim 3]

The method according to claim 1 or 2,

The antenna patch surface is,

Small antenna device, characterized in that formed in the shape of a loop.

[Claim 4]

In that U term,

The antenna fixing surface is,

In the substrate of the antenna device, the small antenna device, characterized in that formed on one side opposite to the antenna patch surface.

[Claim 5]

The method of claim 1,

The feeder is,

The small antenna device, characterized in that connected to the various models of the small electronic device through a via-hole (Via-hole) implemented on one surface of the substrate of the antenna device.

[Claim 6]

The method of claim 1,

The substrate,

A small antenna device comprising one of a Flame Retardant Class 4 (FR4) substrate, a Logis substrate, and a ceramic substrate to mount the antenna patch surface, the antenna fixing surface, and the feed line.

[Claim 7]

The method of claim 1,

The small antenna device is connected to an external measuring device through a measuring jig, the small antenna device characterized in that for identifying the antenna characteristics of at least one of efficiency, average gain, maximum gain.

[Claim 8]

The method of claim 7,

The measuring jig is

At least one antenna mounting surface for fixedly mounting the small antenna device; And a result output terminal for transmitting the antenna characteristic value identified in the small antenna device to an external measuring device.