KR20110087592A

KR20110087592A - The helycal antenna and it method with 2d-type

Info

Publication number: KR20110087592A
Application number: KR1020100007082A
Authority: KR
Inventors: 이상훈
Original assignee: 에이큐 주식회사
Priority date: 2010-01-26
Filing date: 2010-01-26
Publication date: 2011-08-03
Also published as: WO2011093646A3; WO2011093646A2

Abstract

The present invention relates to a helical antenna formed in a 2D method and a method of manufacturing the same, and more particularly, to a helical antenna of various mobile communication terminals, wherein the helical antenna has a semicircular shape on an upper surface of a mobile communication terminal case 110 having a dielectric constant. A plurality of linear antenna patterns are formed in the same direction, and a semi-circular linear antenna pattern is formed on the lower surface of the mobile communication terminal case 110 in a symmetrical direction with the linear antenna pattern formed on the upper surface. The distal end is electrically connected through a via hole formed through the case 110 of the mobile communication terminal, and the linear antenna pattern is formed in a 2D planar manner by etching, printing or spot process. It relates to a helical antenna.

Description

Helical antenna having a two-dimensional (2D) planar spiral shape and a method for manufacturing the same

The present invention relates to a helical antenna having a two-dimensional (2D) planar spiral shape in which a conventional 3D-type antenna is formed in a 2D (dimension) type, and a method of manufacturing the same.

Reducing the size of the antenna in antenna technology is one of the main research areas. Recently, due to the rapid development of mobile communication systems, the demand for mobile phones, vehicle phones and pagers is increasing, and efforts to improve performance with base station systems continue to be made. It is becoming.

Typically, antennas are used to receive radio signals and have different shapes and sizes depending on the frequencies used. The reason why the antennas have different sizes and shapes is to accurately receive the signals according to the frequency characteristics of the signals used.

Many antennas are used in mobile communication antennas, but helical antennas take up the largest portion of the antennas, and the reason is that they can be manufactured in a small size that can be mounted on a terminal, and thus do not significantly affect the design of the terminal. And it is easy to produce by simple structure and has omnidirectional radiation pattern suitable for mobile communication service.

The helical antenna is a portable terminal having an antenna formed in the shape of a helical antenna in Korean Laid-Open Patent Publication No. 10-2009-0118764, and a built-in helical antenna of a mobile communication terminal has been presented in Korean Patent Publication No. 10-0791520,

Conventional helical antennas have shorter lengths than dipole antennas, and are more efficient when using matching circuits and can produce various types of polarization and radiation patterns. There was a problem in that the volume of the mobile phone itself was increased due to dedicating a specific space of the mobile phone, and above all, the additional cost of the mold design was high, and external noise was generated through DMB reception and FM reception.

1. Published Patent 10-2007-0074314 2.Public Patent 10-2009-0106782 3.Registered Patent 10-0372869 4.Registered Patent 10-0589699 5.Registered Patent 10-0691162 6.Registered Patent 10-0791520 7. Published Patent No. 10-2009-0118764

In order to solve the above problem, the present invention applies two kinds of antenna pattern methods selected from etching, printing or spot methods to a conventional three-dimensional (helical) type helical antenna on both surfaces of a mobile communication terminal case. It is intended to provide a helical antenna having a two-dimensional (2D) planar spiral shape and a method of manufacturing the same, which can solve the problem of additional costs and noise generation due to mold design.

In order to achieve the above object, a helical antenna having a two-dimensional (2D) planar spiral shape according to the present invention is

It consists of a helical antenna 200 of the mobile communication terminal 100 having FM radio reception and DMB reception function,

The helical antenna 200 has a plurality of semicircular first linear antenna patterns 210 formed on the front surface 111 of the mobile communication terminal case 110 having a dielectric constant spaced apart in the same direction, and the mobile communication terminal case ( The semi-circular second linear antenna pattern 220 formed on the rear surface 112 of the 110 is spaced apart from the first linear antenna pattern formed on the front surface of the case in a symmetrical direction, and is formed of the first surface of the front surface 111. It is connected to each other through the via hole 103 formed between the end of the one linear antenna pattern 210 and the end of the second linear antenna pattern 220 of the rear surface 112 that is connected to each other two-dimensional ( 2D) to form a planar spiral shape.

In addition, the helical antenna manufacturing method having a two-dimensional (2D) planar spiral shape according to the present invention

Etching process is formed integrally with the mobile communication terminal case 110,

The etching and laminating step of coating copper on the mobile communication terminal case 110 and

Forming an antenna pattern by etching by using an etching solution formed by adding a corrosion inhibitor and an insoluble powder to an iron chloride solution to the laminating treatment site;

It is achieved by forming through a protective printing step of printing with a viscosity of 30,000 ~ 50,000 (cps) urethane for the protection of the antenna pattern.

Forming an antenna pattern on the mobile communication terminal case 110 by using a conductive ink by the inkjet printing method, the conductive ink is water-based nano-silver ink having a particle size of 10 ~ 25㎛ By dilution in to adjust the viscosity to 3.5-4.5 cP.

The first linear antenna pattern 210 and the first linear antenna pattern 210 which are components of the 13.56Mhz M-Commerce loop antenna 100 of the square spiral pattern through the deposition plating process (PVD) on the mobile communication terminal case 110. A bilinear antenna pattern 220 is formed, and the first linear antenna pattern 210 and the upper portion of the second linear antenna pattern 220 are copper plated.

As described above, the method for manufacturing a helical antenna having a two-dimensional (2D) planar spiral shape according to the present invention is manufactured by mounting a helical antenna provided in a conventional 3D method on a body such as a mobile phone in a 2D type and manufacturing the mold. Productivity can be increased by reducing equipment, and it is possible to provide electronic devices such as mobile phones having high functionality by reducing noise generation compared to existing 3D methods.

1 is a plan view showing a helical antenna having a two-dimensional (2D) planar spiral shape formed on a case surface of a mobile communication terminal according to the present invention;
Figure 2 is an embodiment showing that a plurality of semi-circular first linear antenna pattern 210 formed on the front surface 111 of the mobile communication terminal case 110 according to the present invention spaced apart in the same direction,
3 is a semicircular second linear antenna pattern 220 formed on the rear surface 112 of the case 110 of the mobile communication terminal according to the present invention is spaced apart in a symmetrical direction from the first linear antenna pattern formed on the front surface of the case An embodiment showing a plurality formed,
4 is a diagram illustrating a design process of a helical antenna having a two-dimensional (2D) planar spiral shape;
Figure 5 is a first primer layer (B) (thickness of 1 ~ 4㎛), the conductive ink on the upper surface of the base substrate (for example 50 ~ 300㎛ thickness) (A) made of a shielding material or a protective tape according to the present invention Two-dimensional (2D) plane consisting of coating layer (C) (thickness of 1 to 5 μm), plating layer (D) (thickness of 15 to 30 μm), and top cover layer (E) (thickness of 5 to 10 μm) A plan view showing the completion of a helical antenna having a spiral shape.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a plan view showing a helical antenna having a two-dimensional (2D) planar spiral shape formed on a case surface of a mobile communication terminal according to the present invention, which has a shape of winding up like a spiral shape, and a planar ground plane It has a structure.

Helical antennas can cause resonance at shorter lengths than monopole antennas. The radiation pattern is the same as for the dipole antenna, and the radiation resistance is the same as that of the monopole antenna of the same height.

First, a helical antenna having a two-dimensional (2D) planar spiral shape described in the present invention is a helical antenna of a mobile communication terminal 100 having FM radio reception, DMB reception, and battery wireless charging functions, as shown in FIG. It consists of an antenna 200.

That is, as shown in FIG. 2, the helical antenna 200 has a semicircular first linear antenna pattern 210 spaced apart in the same direction on the front surface 111 of the mobile communication terminal case 110 having a dielectric constant. Many are formed.

Subsequently, as shown in FIG. 3, the semi-circular second linear antenna pattern 220 formed on the rear surface 112 of the mobile communication terminal case 110 is symmetrical with the first linear antenna pattern formed on the front surface of the case. A large number is formed spaced apart in the direction.

This is connected to each other through a via hole 103 formed between the end of the first linear antenna pattern 210 of the front surface 111 and the end of the second linear antenna pattern 220 of the rear surface 112 that follows. Both surfaces of the terminal case are formed in a two-dimensional (2D) planar spiral shape.

The helical antenna 200 according to the present invention is, for example, formed in a two-dimensional plane type by etching, printing, or spot processes on the outer surface and the inner surface of a battery of a mobile communication terminal such as a mobile phone, and the inside of the mobile phone. It is an antenna that performs FM radio reception, DMB reception, and battery wireless charging through main chip control.

The helical antenna 200 according to the present invention has a first primer layer B (thickness of 1 to 4 μm) on an upper surface of a base substrate (for example, thickness of 50 to 300 μm) A made of a shielding material or a protective tape. , Two-dimensional (2D) consisting of conductive ink coating layer (C) (thickness of 1 to 5 μm), plating layer (D) (thickness of 15 to 30 μm), and top cover layer (E) (thickness of 5 to 10 μm) It is a basic structure designed in planar spiral shape.

In addition, the helical antenna 200 according to the present invention is a first primer layer (B) (1 ~ 4 ㎛ of the upper surface of the base substrate (for example 50 ~ 300 ㎛ thickness) (A) made of a shielding material or a protective tape Thickness), plating layer (D) (thickness of 15 to 30 mu m), and top cover layer (E) (thickness of 5 to 10 mu m) to a basic structure consisting of a two-dimensional (2D) planar spiral shape.

In addition, the helical antenna 200 according to the present invention is a first primer layer (B) (1 ~ 4 ㎛ of the upper surface of the base substrate (for example 50 ~ 300 ㎛ thickness) (A) made of a shielding material or a protective tape Thickness), conductive ink coating layer (C) (thickness of 1 to 5 mu m), and top cover layer (E) (thickness of 5 to 10 mu m) to a basic structure consisting of two-dimensional (2D) planar spiral shapes. .

That is, the base substrate A made of a shielding material or a protective tape (absorption bar) absorbs or blocks electromagnetic waves for the purpose of reducing noise or errors caused by electromagnetic waves generated from around the helical antenna. And the iron powder is plated with nickel.

The first primer layer (B) is made of a styrene rubber, a polyolefin rubber, or a cycloolefin polymer containing both thereof, and refers to a layer that mitigates an external impact.

The conductive ink coating layer C is a helical having a two-dimensional (2D) planar spiral shape in a central empty space after a 13.56Mhz M-Commerce loop antenna 100 having a square spiral pattern is first formed through a conductive ink. Refers to the layer on which the antenna 200 is formed. It is formed by a printing process.

The plating layer (D) is formed of a conductive material on the helical antenna 200 having a square spiral pattern of 13.56Mhz M-Commerce loop antenna 100 and a two-dimensional (2D) planar spiral shape through conductive ink. Say floor. It is not compatible with the conductive ink application layer (C) and is formed by an etching process or a deposition plating process alone.

The upper cover layer (E) has a polyamide-like cover on the helical antenna 200 having a flat spiral shape of 13.56Mhz M-Commerce loop antenna 100 and a two-dimensional (2D) plated square spiral pattern. Refers to a layer formed by coating.

The first terminal portion is formed at the inner end of the helical antenna, and the second terminal portion is formed at one side of the first terminal portion.

Here, the first terminal portion and the second terminal portion is made of a conductive metal plate, and serves to connect the FM radio receiver filter unit, the DMB receiver filter unit, the battery wireless charging filter unit of the mobile phone body.

Next, a helical antenna design process having a two-dimensional (2D) planar spiral shape according to the present invention will be described.

The helical antenna having a two-dimensional (2D) planar spiral shape is designed to operate in two modes, a normal mode and an axial mode.

Normal mode produces the strongest radiation in the normal direction of the helical antenna axis. This happens when the diameter of the spiral is small compared to the wavelength.

Axial mode produces maximum radiation along the axis of the helical antenna. This occurs in axial mode when the circumference of the helix is about the wavelength.

In FIG. 4, the pitch angle of the helical antenna (

) Can be expressed as in Equation 1.

Where D represents the diameter of the spiral, C represents the circumference, S represents the pitch, the distance from the center of the spiral to the center, and L ₀ represents the length of one wheel.

In addition, the radiation resistance R _T applied to the helical antenna having the two-dimensional (2D) planar spiral shape by experiment can be expressed as in Equation (2).

Subsequently, a half-power angle (θ), which is a measure of the sensitivity of directional directional helical antennas, is obtained by radiating resistance (R _T ) applied to a helical antenna having a two-dimensional (2D) planar spiral shape. As can be seen, Equation 3 can be expressed.

Here, the half-value angle is an angle representing the sensitivity of the antenna directivity, and refers to an angle formed in two directions, which is one half of the maximum value of the main beam in the antenna's directivity. 1/1 of the maximum value of the main beam when the directivity characteristic is expressed by the electric field strength

This is the angle between the two directions.

That is, it has a unidirectional sensitive directivity characteristic in which one main lobe appears in the spiral axis direction and a side lobe appears in the spiral axis and the oblique direction. If the circumference of the helix is about 1λ, the traveling wave current is distributed on the helix to obtain a single directivity.

At this time, considering the spiral winding as a unit antenna, if there are n windings, a helical antenna having a beam antenna composed of n elements is formed.

In the radiation type, the helical antenna having a circularly polarized antenna is formed because the spiral portions are symmetrical with respect to the spiral axis direction.

Subsequently, the efficiency of the helical antenna having the two-dimensional (2D) planar spiral shape according to the present invention is designed in consideration of the loss in the antenna structure and the input terminal.

The overall efficiency of the helical antenna can be expressed as Equation 4 below.

Here, e ₀ represents overall efficiency (dimensionless), e _r represents reflection (mismatching) efficiency, e _c represents conductor efficiency, and e _d represents dielectric efficiency.

And,

Is the voltage reflection coefficient at the input terminal of the antenna

Z _A is the antenna input impedance, and Z ₀ is the characteristic impedance of the transmission line.

Since the helical antenna radiation efficiency is used in connection with gain and directivity, this can be expressed as in Equation 5.

here,

Is the antenna radiation resistance,

Denotes the conduction-dielectric loss resistance.

Hereinafter, the helical antenna of the 3D (dimension) type is etched, printed or A method of manufacturing a two-dimensional (2D) planar spiral shape on both surfaces of a case of a mobile communication terminal by applying any one antenna pattern method selected from the spot methods will be described.

Etching process

The linear antenna pattern 20 is integrally formed in the mobile communication terminal case 110 by etching.

Forming an antenna pattern by etching the etching portion using an etching solution on the laminating treatment portion;

For the protection of the antenna pattern is made of a protective printing step of printing with a viscosity of 30,000 ~ 50,000 (cps) urethane.

In this case, the etching solution is used to prevent corrosion of the linear antenna pattern 20 and to form a high quality pattern, by using a corrosion inhibitor and an insoluble powder added to the iron chloride solution.

Iron chloride is a compound of iron and chlorine, and iron (III) iron (II) chloride, which is a chloride containing divalent and trivalent iron in addition to iron (II) chloride and iron (III) chloride, is known. Ferric chloride (II), also called ferrous chloride, exists as a Lorentzite with nickel chloride in natural iron or volcanic fumes, and has a melting point of 672 ° C, a boiling point of 1,023.4 ° C and a specific gravity of 2.99 (18 ° C).

Ferric chloride (III), also known as ferric chloride, is found in volcanic eruptions or meteorites and has a melting point of 300 ° C, a boiling point of 317 ° C and a specific gravity of 2.804 (11 ° C).

Looking at the etching mechanism using the iron chloride is shown in Scheme 1.

[Reaction Scheme 1]

FeCl ₃ + Cu → FeCl ₂ + CuCl

As in Scheme 1, iron ions oxidize copper to produce ferrous chloride and cupric chloride.

[Reaction Scheme 2]

FeCl ₃ + CuCl → FeCl ₂ + CuCl ₂

As in Scheme 2, cuprous chloride produced in Scheme 1 further oxidizes copper to produce ferrous chloride and cupric chloride.

The etching solution uses a corrosion inhibitor and an insoluble powder to prevent the antenna pattern corrosion failure and to obtain a strong physical etching effect.

The corrosion inhibitor uses Benzotriazole.

The amount of the corrosion inhibitor is 0.40mM to 0.45mM / L with respect to the entire etching solution. If the corrosion inhibitor is less than 0.40mM / L, the probability of corrosion of the antenna pattern is high. Since there is a problem that is not made, the corrosion inhibitor is preferably used in the range of 0.40mM to 0.45mM / L with respect to the etching solution.

And, the temperature used by the addition of the corrosion inhibitor is 40 ~ 50 ℃, when the temperature used by adding the corrosion inhibitor is less than 40 ℃ that the activity is lowered and the function of the corrosion inhibitor is added to the etching is not made If the temperature exceeds 50 ° C., the etching rate is high and the etching proceeds excessively. Therefore, it is preferable to maintain the temperature at 40 to 50 ° C. by using the corrosion inhibitor.

The insoluble powder is 0.5 ~ 1㎛ TiO ₂ , 0.25mM to 0.30mM / L is used for the entire etching solution. If the particle size of the insoluble powder is less than 0.5㎛ it is difficult to expect a physical etching effect, if it exceeds 1㎛ it may interfere with the spraying of the powder clustering, the particle size of the insoluble powder is 0.5 It is used in the range of ˜1 μm.

When the insoluble powder is less than 0.25mM with respect to the entire etching solution, it is difficult to expect a physical etching effect, and when the insoluble powder exceeds 0.30mM / L, the powder may interfere with the flow of the etching solution to prevent smooth etching. Since the insoluble powder may be used in an amount of 0.25 mM to 0.30 mM / L based on the total etching solution.

Printing process

The printing process has the advantage of being able to realize an electronic device having a line width of several hundreds of micrometers, and having a high production speed and easy mass production. The printing process includes an inkjet process, a screen process, and a roll printing process, in which the quality of printing varies depending on the printing pressure and viscosity of the ink.

The linear antenna pattern 20 is a conductive ink to form an antenna pattern on the mobile communication terminal case 110 by the inkjet printing method, the conductive ink is water-based silver nano ink having a particle size of 10 ~ 25㎛ (water- based nano-silver ink) was diluted with water to adjust the viscosity to 3.5 ~ 4.5cP.

When the viscosity is less than 3.5 cP, bleeding occurs, which causes a non-uniform ink transition, thereby causing an irregular line width. In addition, the line width is irregular, causing the bottleneck partially to increase the resistance. In addition, when the viscosity exceeds 4.5 cP, the ink transfer rate decreases and the print quality is lowered. Therefore, the viscosity of the ink is preferably maintained in the range of 3.5 to 4.5 cP.

Deposition Plating Process

The deposition plating process (PVD) is for depositing a copper thin film, and the deposition material is vaporized and deposited in the absence of plasma. At this time, the temperature of the substrate is 200 ~ 1600 ℃, the deposition thickness is 100nm ~ 100㎛, the deposition rate is 1 ~ 25㎛ / min.

The helical antenna formed by the 2D method according to the present invention reduces the mold design cost, reduces the noise generation, and reduces the antenna formation space by changing the existing 3D type antenna to the 2D type. In addition, there is industrial applicability in the advantages of manufacturing and using by applying to terminals of various mobile communication devices.

110: mobile communication terminal case 111: front surface
112: rear surface 200: helical antenna
210: first linear antenna pattern 220: second linear antenna pattern

Claims

In the helical antenna 200 of the mobile communication terminal 100 having FM radio reception and DMB reception function,
The helical antenna 200 has a plurality of semicircular first linear antenna patterns 210 formed on the front surface 111 of the mobile communication terminal case 110 having a dielectric constant spaced apart in the same direction, and the mobile communication terminal case ( The semi-circular second linear antenna pattern 220 formed on the rear surface 112 of the 110 is spaced apart from the first linear antenna pattern formed on the front surface of the case in a symmetrical direction, and is formed of the first surface of the front surface 111. It is connected to each other through the via hole 103 formed between the end of the one linear antenna pattern 210 and the end of the second linear antenna pattern 220 of the rear surface 112 that is connected to each other two-dimensional ( A helical antenna having a two-dimensional (2D) planar spiral shape, which is formed in a planar spiral shape of 2D).

The method of claim 1,
The helical antenna 200 formed in the two-dimensional (2D) planar spiral shape is
Etching process is formed integrally with the mobile communication terminal case 110,
The etching and laminating step of coating copper on the mobile communication terminal case 110 and
Forming an antenna pattern by etching by using an etching solution formed by adding a corrosion inhibitor and an insoluble powder to an iron chloride solution to the laminating treatment site;
Helical antenna having a two-dimensional (2D) planar spiral shape is formed through a protective printing step of printing with a viscosity of 30,000 ~ 50,000 (cps) urethane for the protection of the antenna pattern.

The method of claim 1,
The helical antenna 200 formed in the two-dimensional (2D) planar spiral shape is
Forming an antenna pattern on the mobile communication terminal case 110 by using a conductive ink by the inkjet printing method, the conductive ink is water-based nano-silver ink having a particle size of 10 ~ 25㎛ Helical antenna manufacturing method having a two-dimensional (2D) planar spiral shape characterized in that the viscosity is adjusted to 3.5 ~ 4.5cP by diluting to.

The method of claim 1,
The helical antenna 200 formed in the two-dimensional (2D) planar spiral shape is
The first linear antenna pattern 210 and the first linear antenna pattern 210 which are components of the 13.56Mhz M-Commerce loop antenna 100 of the square spiral pattern through the deposition plating process (PVD) on the mobile communication terminal case 110. Helical having a two-dimensional (2D) planar spiral shape, characterized in that to form a two-linear antenna pattern 220, and copper plating the upper portion of the first linear antenna pattern 210 and the second linear antenna pattern 220 Antenna manufacturing method.

The method of claim 1, wherein the helical antenna 200
A base substrate (A) made of a shielding material or a protective tape (absorption bar) for absorbing or blocking electromagnetic waves for the purpose of reducing noise or errors caused by electromagnetic waves generated from around the helical antenna;
A first primer layer (B) composed of a styrene rubber, a polyolefin rubber, or a cycloolefin polymer blended with both, to mitigate an external impact,
A conductive ink coating layer C on which a helical antenna having a planar spiral shape is formed through conductive ink;
A plating layer (D) in which plating is formed of a conductive material on a helical antenna having a planar spiral shape formed through a conductive ink,
A method for manufacturing a helical antenna having a two-dimensional (2D) planar spiral shape, comprising an upper cover layer (E) formed by coating a cover such as polyamide on a planar spiral-shaped helical antenna on which plating is completed.