阅读说明：本技术 一种宽波束低宽角轴比圆极化天线单元及其辐射方法 (Wide-beam low-width-angle-to-axis-ratio circularly polarized antenna unit and radiation method thereof ) 是由 李岩 田步宁 刘虎 李若昕 吕鹏 张建波 闫振 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种宽波束低宽角轴比圆极化天线单元及其辐射方法,该单元包括：介质基片、四个亚波长单元、四个匹配枝节和四个馈电同轴接头；其中,四个亚波长单元分布于第一象限、第二象限、第三象限和第四象限四个象限内；四个亚波长单元关于介质基片的中心点中心对称；每个亚波长单元包括短路臂与辐射器；辐射器位于介质基片的一侧上,短路臂位于辐射器一侧末端,匹配枝节位于介质基片上,馈电同轴接头的内导体穿过介质基片与匹配枝节相连；匹配枝节将馈电同轴接头馈入的射频信号耦合到相对应的辐射器。本发明解决了传统宽波束天线剖面高、尺寸大的问题；同时解决了宽角扫描相控阵天线大角度扫描时增益损失大的问题。(The invention discloses a wide-beam low-width-angle-axial-ratio circularly polarized antenna unit and a radiation method thereof, wherein the unit comprises: the device comprises a dielectric substrate, four sub-wavelength units, four matching branches and four feed coaxial connectors; the four sub-wavelength units are distributed in four quadrants of a first quadrant, a second quadrant, a third quadrant and a fourth quadrant; the four sub-wavelength units are centrosymmetric about the central point of the dielectric substrate; each sub-wavelength unit comprises a short-circuit arm and a radiator; the radiator is positioned on one side of the dielectric substrate, the short-circuit arm is positioned at the tail end of one side of the radiator, the matching branch is positioned on the dielectric substrate, and the inner conductor of the feed coaxial connector penetrates through the dielectric substrate to be connected with the matching branch; the matching branches couple the radio frequency signals fed by the feeding coaxial connectors to the corresponding radiators. The invention solves the problems of high profile and large size of the traditional wide beam antenna; meanwhile, the problem of large gain loss during large-angle scanning of the wide-angle scanning phased array antenna is solved.)

1. A wide-beam low-width-to-axial-ratio circularly polarized antenna unit is characterized by comprising: the device comprises a dielectric substrate (5), four sub-wavelength units, four matching branches (3) and four feed coaxial connectors (4); wherein the content of the first and second substances,

the four sub-wavelength units are distributed in four quadrants of a first quadrant, a second quadrant, a third quadrant and a fourth quadrant;

the four sub-wavelength units are centrosymmetric about the central point of the dielectric substrate (5);

each subwavelength cell comprises a short-circuit arm (2) and the radiator (1);

the radiator (1) is positioned on one side of the dielectric substrate (5), the short-circuit arm (2) is positioned at the tail end of one side of the radiator (1), the matching branch (3) is positioned on the dielectric substrate (5), and an inner conductor of the feed coaxial connector (4) penetrates through the dielectric substrate (5) and is connected with the matching branch (3);

the dielectric substrate (5) is used for supporting the annular radiator (1) and the matching branch (3);

the matching branches (3) couple the radio-frequency signals fed by the feed coaxial connectors (4) to the corresponding radiators (1);

the 4 feed coaxial connectors (4) are used for feeding external radio frequency signals into the sub-wavelength antenna unit positioned in the first quadrant, the sub-wavelength antenna unit positioned in the second quadrant, the sub-wavelength antenna unit positioned in the third quadrant and the sub-wavelength antenna unit positioned in the fourth quadrant according to the phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively, electromagnetic waves generated by the four sub-wavelength antenna units are subjected to power synthesis in a free space, and a circularly polarized beam with a wide beam and a low wide angular-axis ratio is formed.

2. The wide-beam low-width axial ratio circularly polarized antenna unit according to claim 1, wherein: the medium substrate (5) is a copper-clad plate; the copper-clad plate comprises two metal layers and a dielectric layer, wherein the dielectric layer is positioned between the two metal layers, one metal layer is used as an upper surface, and a radiator (1) is etched on the upper surface; and etching the matching branches (3) on the same metal layer.

3. A wide-beam, low-width-to-axial-ratio circularly polarized antenna unit according to claim 1, wherein: the medium substrate (5) is a copper-clad plate; the copper-clad plate comprises three metal layers and two dielectric layers, wherein one dielectric layer is arranged between two adjacent metal layers, one metal layer is arranged between two adjacent dielectric layers, and the three metal layers are an upper surface metal layer, a middle metal layer and a lower surface metal layer in sequence; etching a radiator (1) on the middle metal layer; and etching the matching branch (3) on the upper surface metal layer.

4. A wide-beam, low-width-to-axial-ratio circularly polarized antenna unit according to claim 1, wherein: the medium substrate (5) is a copper-clad plate; the copper-clad plate comprises three metal layers and two dielectric layers, wherein one dielectric layer is arranged between two adjacent metal layers, one metal layer is arranged between two adjacent dielectric layers, and the three metal layers are an upper surface metal layer, a middle metal layer and a lower surface metal layer in sequence; etching the matching branch (3) on the middle metal layer; and etching the annular structure on the upper surface metal layer to form an annular radiator (1).

5. A wide-beam, low-width-to-axial-ratio circularly polarized antenna unit according to claim 1, wherein: the length of the radiator (1) is 1/4 medium wavelengths, and the shape of the radiator (1) is arc or square.

6. A wide-beam, low-width-to-axial-ratio circularly polarized antenna unit according to claim 1, wherein: the matching branch sections (3) are arc-shaped or square.

7. A wide-beam, low-width-to-axial-ratio circularly polarized antenna unit according to claim 1, wherein: the feed coaxial connector (4) comprises an inner conductor, an outer conductor and a flange, wherein the inner conductor is a metal probe, the flange is fixed on a metal layer of the unetched radiator (1) and the matching branch (3) in the dielectric substrate (5) through screws, one end of the inner conductor penetrates through the dielectric substrate (5) to be connected with the matching branch (3), and the other end of the inner conductor is matched with the outer conductor to form a coaxial structure to serve as a signal input and output interface.

8. A wideband phased array antenna unit in accordance with claim 1, characterised in that: the medium substrate (5) is made of polytetrafluoroethylene glass fiber material with the dielectric constant of 2.2.

9. A wideband phased array antenna unit in accordance with claim 1, characterised in that: the medium substrate (5) is made of polytetrafluoroethylene glass fiber, polyimide, polyethylene, polystyrene, quartz or ceramic materials.

10. A method of radiating a wideband phased array antenna element, the method comprising the steps of:

the first 4 feeding coaxial connectors (4) feed external radio frequency signals into the sub-wavelength antenna unit positioned in the first quadrant, the sub-wavelength antenna unit positioned in the second quadrant, the sub-wavelength antenna unit positioned in the third quadrant and the sub-wavelength antenna unit positioned in the fourth quadrant according to the phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees;

secondly, performing power synthesis on the electromagnetic waves generated by the four sub-wavelength antenna units in the step one in a free space to form a circularly polarized wave beam with wide wave beam and low wide angle-axis ratio;

and (III) radiating the electromagnetic waves of the circularly polarized beam with wide beam and low wide angle-axis ratio generated in the step (II) into free space.

Technical Field

The invention belongs to the technical field of electromagnetic radiation, and particularly relates to a wide-beam low-width-angle-axial-ratio circularly polarized antenna unit and a radiation method thereof.

Background

The circularly polarized antenna unit with wide beam and low wide angle-axis ratio has very wide requirements in the antenna field, and can effectively expand the measurement and control area as an independently used measurement and control antenna unit; as an array element of a wide-angle scanning phased array antenna, it is effective to reduce the gain loss of the phased array antenna during large-angle scanning, and therefore, it is necessary to develop a circular polarized antenna element having a wide beam and a low wide angular-axial ratio.

The antenna miniaturization, the use of auxiliary units, the addition of periodic structures, the comprehensive use of magnetoelectric resonance structures, the directional diagram reconstruction and the like are main methods for widening antenna beams. The aperture of the antenna unit is reduced, the gain is reduced, and the wave beam is naturally increased, so that the method has the advantages of low radiation efficiency and narrow antenna bandwidth; the antenna unit of the wide wave beam is realized by combining two radiation modes of the microstrip antenna and the dipole antenna, and the method has the defects of high antenna section; the periodic structure has the function of adjusting the refractive index of the antenna, and the radiation beam range of the antenna can be adjusted by adding the periodic structure, so that the mode has the defects of large antenna size and is not favorable for being used as an array unit of a phased array antenna; the magnetoelectric resonance structure is used for considering the mirror image effect of the ground, and the directional diagram is improved through the two-dimensional array effect of the radiation antenna and the mirror image source, and the method also has the problems that the antenna size is large and the use as an array unit of the phased array antenna is not facilitated; the reconfigurable manner through the directional diagram has the disadvantage of requiring the addition of control switches.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the wide-beam and low-wide-angle-to-axis circularly polarized antenna unit and the radiation method thereof are provided, and the problems of high profile and large size of the traditional wide-beam antenna are solved; meanwhile, the problem of large gain loss during large-angle scanning of the wide-angle scanning phased array antenna is solved.

The purpose of the invention is realized by the following technical scheme: a wide-beam low-width aspect ratio circularly polarized antenna element, comprising: the device comprises a dielectric substrate, four sub-wavelength units, four matching branches and four feed coaxial connectors; the four sub-wavelength units are distributed in four quadrants of a first quadrant, a second quadrant, a third quadrant and a fourth quadrant; the four sub-wavelength units are centrosymmetric about the central point of the dielectric substrate; each sub-wavelength unit comprises a short-circuit arm and the radiator; the radiator is positioned on one side of the dielectric substrate, the short-circuit arm is positioned at the tail end of one side of the radiator, the matching branch is positioned on the dielectric substrate, and the inner conductor of the feed coaxial connector penetrates through the dielectric substrate to be connected with the matching branch; the dielectric substrate is used for supporting the annular radiator and the matching branch; the matching branches couple the radio-frequency signals fed in by the feed coaxial connectors to corresponding radiators; the 4 feed coaxial connectors are used for feeding external radio frequency signals into the sub-wavelength antenna unit located in the first quadrant, the sub-wavelength antenna unit located in the second quadrant, the sub-wavelength antenna unit located in the third quadrant and the sub-wavelength antenna unit located in the fourth quadrant according to the phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively, electromagnetic waves generated by the four sub-wavelength antenna units are subjected to power synthesis in a free space, and a circularly polarized beam with a wide beam and a low wide angular-axial ratio is formed.

In the wide-beam low-width-angular-axial-ratio circularly polarized antenna unit, the dielectric substrate is a copper-clad plate; the copper-clad plate comprises two metal layers and a dielectric layer, wherein the dielectric layer is positioned between the two metal layers, one metal layer is used as an upper surface, and a radiator is etched on the upper surface; and etching the matching branches on the same metal layer.

In the wide-beam low-width-angular-axial-ratio circularly polarized antenna unit, the dielectric substrate is a copper-clad plate; the copper-clad plate comprises three metal layers and two dielectric layers, wherein one dielectric layer is arranged between two adjacent metal layers, one metal layer is arranged between two adjacent dielectric layers, and the three metal layers are an upper surface metal layer, a middle metal layer and a lower surface metal layer in sequence; etching a radiator on the middle metal layer; and etching matching branches on the upper surface metal layer.

In the wide-beam low-width-angular-axial-ratio circularly polarized antenna unit, the dielectric substrate is a copper-clad plate; the copper-clad plate comprises three metal layers and two dielectric layers, wherein one dielectric layer is arranged between two adjacent metal layers, one metal layer is arranged between two adjacent dielectric layers, and the three metal layers are an upper surface metal layer, a middle metal layer and a lower surface metal layer in sequence; etching matching branches on the intermediate metal layer; and etching the annular structure on the upper surface metal layer to form an annular radiator.

In the above circular polarization antenna unit with wide beam and low width of angular axis ratio, the length of the radiator is one medium wavelength, and the shape of the radiator is arc or square.

In the wide-beam low-width-to-axial-ratio circularly polarized antenna unit, the matching branch is arc-shaped or square.

In the circularly polarized antenna unit with the wide beam and the low width of the angular-to-axial ratio, the feed coaxial connector comprises an inner conductor, an outer conductor and a flange, wherein the inner conductor is a metal probe, the flange is fixed on a metal layer of an unetched radiator and a matching branch in a dielectric substrate through screws, one end of the inner conductor penetrates through the dielectric substrate and is connected with the matching branch, and the other end of the inner conductor is matched with the outer conductor to form a coaxial structure to serve as a signal input and output interface.

In the circular polarized antenna unit with wide wave beam and low wide angle-to-axis ratio, the dielectric substrate is made of polytetrafluoroethylene glass fiber material with dielectric constant.

In the circularly polarized antenna unit with the wide wave beam and the low wide angle-to-axis ratio, the dielectric substrate is made of polytetrafluoroethylene glass fiber, polyimide, polyethylene, polystyrene, quartz or ceramic material.

A method of radiating a wideband phased array antenna element, the method comprising the steps of: the first 4 feeding coaxial connectors respectively feed external radio-frequency signals into the sub-wavelength antenna unit positioned in the first quadrant, the sub-wavelength antenna unit positioned in the second quadrant, the sub-wavelength antenna unit positioned in the third quadrant and the sub-wavelength antenna unit positioned in the fourth quadrant according to the phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees; secondly, performing power synthesis on the electromagnetic waves generated by the four sub-wavelength antenna units in the step one in a free space to form a circularly polarized wave beam with wide wave beam and low wide angle-axis ratio; and (III) radiating the electromagnetic waves of the circularly polarized beam with wide beam and low wide angle-axis ratio generated in the step (II) into free space.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention has small size, low section and light weight, and is very suitable for microsatellites with high important requirements on load; meanwhile, due to the fact that the section is low, the view field blocking of other antenna beams can be avoided;

(2) when the wide-angle scanning phased array antenna is used as an array element of the wide-angle scanning phased array antenna, the wide-angle scanning phased array antenna is easy to produce in batches, is low in cost and is beneficial to large-scale commercial use of a future phased array antenna system;

(3) the invention is easy to form circular polarization, avoids the superposition cancellation of the main signal and the reflected signal in the transmission process and reduces the transmission attenuation.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a side view of an antenna unit;

fig. 2 is a top view of an antenna element;

FIG. 3 is a schematic diagram of an active standing wave for four feed ports;

fig. 4 is a radiation pattern of an antenna element;

fig. 5 is a schematic diagram of the axial ratio of the antenna element.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1 is a side view of an antenna unit; fig. 2 is a top view of the antenna element. As shown in fig. 1 and 2, the wide-beam low-width axial ratio circularly polarized antenna unit includes: the device comprises a dielectric substrate 5, four sub-wavelength units, four matching branches 3 and four feed coaxial connectors 4; wherein the content of the first and second substances,

the four sub-wavelength units are distributed in four quadrants of a first quadrant, a second quadrant, a third quadrant and a fourth quadrant; the four sub-wavelength units are centrosymmetric about the central point of the dielectric substrate 5; each subwavelength cell comprises a shorting arm 2 and the radiator 1; the radiator 1 is positioned on one side of the dielectric substrate 5, the short circuit arm 2 is positioned at the tail end of one side of the radiator 1, the matching branch 3 is positioned on the dielectric substrate 5, and the inner conductor of the feed coaxial connector 4 penetrates through the dielectric substrate 5 to be connected with the matching branch 3; the dielectric substrate 5 is used for supporting the annular radiator 1 and the matching branch 3; the matching branches 3 couple the radio frequency signals fed in by the feed coaxial connectors 4 to the corresponding radiators 1; the gap between the matching branch 3 and the radiator 1 and the length of the matching branch 3 can be adjusted to adjust the coupling energy, so that the impedance matching of the circular polarized antenna unit with wide beam and low wide angular-axial ratio is realized; the 4 feed coaxial connectors 4 are used for feeding external radio frequency signals into the sub-wavelength antenna unit located in the first quadrant, the sub-wavelength antenna unit located in the second quadrant, the sub-wavelength antenna unit located in the third quadrant and the sub-wavelength antenna unit located in the fourth quadrant according to phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees, electromagnetic waves generated by the four sub-wavelength antenna units are subjected to power synthesis in a free space, and a circularly polarized beam with a wide beam and a low wide angular-to-axial ratio is formed.

The antenna size of the long antenna element is reduced to one eighth of the dielectric wavelength; respectively rotating the designed sub-wavelength antenna units by 0 degree, 90 degrees, 180 degrees and 270 degrees to form a novel antenna unit for radiating circular polarized waves; external radio frequency signals with the four phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees are respectively fed into the sub-wavelength antenna unit through the coaxial connectors, power synthesis is carried out in free space, and circular polarized beams with wide beams and low wide angle-to-axis ratio characteristics are achieved. The invention can be used as an independent antenna unit for measurement and control antennas of various platforms, and can also be used as an array unit of a wide-angle scanning phased array antenna.

Specifically, a coordinate system is established with the central point of the upper surface of the dielectric substrate 5 as the origin of coordinates, the upper surface of the dielectric substrate 5 as a square, the length parallel to the square as the X axis, and the width parallel to the square as the Y axis, the upper left portion being the first quadrant, the upper right portion being the second quadrant, the lower right portion being the third quadrant, and the lower left portion being the fourth quadrant.

The medium substrate 5 is a copper-clad plate; the copper-clad plate comprises two metal layers and a dielectric layer, wherein the dielectric layer is positioned between the two metal layers, one metal layer is used as an upper surface, and the radiator 1 is etched on the upper surface; matching branches 3 are etched on the same metal layer.

The medium substrate 5 is a copper-clad plate; the copper-clad plate comprises three metal layers and two dielectric layers, wherein one dielectric layer is arranged between two adjacent metal layers, one metal layer is arranged between two adjacent dielectric layers, and the three metal layers are an upper surface metal layer, a middle metal layer and a lower surface metal layer in sequence; etching a radiator 1 on the middle metal layer; and etching the matching branches 3 on the upper surface metal layer.

The medium substrate 5 is a copper-clad plate; the copper-clad plate comprises three metal layers and two dielectric layers, wherein one dielectric layer is arranged between two adjacent metal layers, one metal layer is arranged between two adjacent dielectric layers, and the three metal layers are an upper surface metal layer, a middle metal layer and a lower surface metal layer in sequence; etching the matching branch 3 on the middle metal layer; a ring-shaped structure is etched on the upper surface metal layer to form a ring-shaped radiator 1.

The length of the radiator 1 is 1/4 medium wavelengths, and the shape of the radiator 1 is arc-shaped or square.

The matching branch 3 is arc-shaped or square.

The end shorting arm 2 of the radiator 1 is connected to the dielectric substrate 5 through the dielectric substrate 5 without etching the metal layers of the radiator 1 and the matching stub 3.

The feed coaxial connector 4 comprises an inner conductor, an outer conductor and a flange, wherein the inner conductor is a metal probe, the flange is fixed on the metal layer of the non-etched radiator 1 and the matching branch 3 in the dielectric substrate 5 through screws, one end of the inner conductor penetrates through the dielectric substrate 5 to be connected with the matching branch 3, and the other end of the inner conductor is matched with the outer conductor to form a coaxial structure as a signal input and output interface.

The dielectric substrate 5 is a polytetrafluoroethylene glass fiber material with a dielectric constant of 2.2. The dielectric substrate 5 is made of polytetrafluoroethylene glass fiber, polyimide, polyethylene, polystyrene, quartz or ceramic material.

As shown in fig. 1, a wide-beam, low-wide-angle-to-axis ratio circularly polarized beam antenna unit, whose working center frequency is 10GHz and bandwidth is XX%, includes: the antenna comprises a dielectric substrate 5, a radiator 1, a short-circuit arm 2, a matching branch 3 and a feed coaxial connector 4.

Dielectric constant ε of dielectric substrate 5_r2.2, thickness h 1.5mm, size λ₀×λ₀λ₀＝c/f₀And c is the speed of light: 3X 10^e8m/s；f₀As the center operating frequency: 10GHz, i.e. 30mm by 30 mm.

The radiator 1 has a length ofλ₀＝c/f₀，f₀As the center operating frequency: 10GHz, i.e. 5.05 mm.

The distance between the two radiators being lambda₀/4λ₀＝c/f₀，f₀As the center operating frequency: 10GHz, i.e. 7.5 mm.

It should be noted that the above-mentioned length of the radiator and the distance between two radiators are the initial antenna size obtained by calculation, and since there is an interaction between the loop radiator 1 and the matching branch 3, the final size needs to be optimized properly according to the full-wave simulation result, the length of the optimized radiator is 4.55mm, and the distance between two radiators is 7.5 mm.

As shown in fig. 2, the relative positional relationships of the mating of the 4 radiators 1, the shorting arm 2, the matching stub 3, and the feeding coaxial connector 4 are 0 °, 90 °, 180 °, and 270 °, respectively.

The phases of the external radio frequency signals fed into the 4 feeding coaxial connectors are respectively 0 degrees, 90 degrees, 180 degrees and 270 degrees.

The simulated active standing wave is shown in fig. 3, wherein the abscissa represents the frequency and the ordinate represents the amplitude of the reflection coefficient; when the reflection coefficient amplitude is | S11| < -10dB, the antenna has good impedance matching characteristics; the central operating frequency of the antenna is 10GHz, and the bandwidth is 1.4%.

The simulated radiation pattern is shown in fig. 4, where the abscissa represents the beam angle range and the ordinate represents the gain of the antenna; the 3dB beamwidth is 140 deg., which is about 1.75 times that of a conventional microstrip antenna, 80 deg..

The axial ratio obtained by the simulation is shown in fig. 5, wherein the abscissa represents the beam angle range, and the ordinate represents the axial ratio of the antenna; the axial ratio of the 3dB wave beam width is less than 2.5dB, and the wide-angle circular polarization performance is good.

The present embodiment also provides a radiation method for a wideband phased array antenna unit, which includes the following steps:

the first 4 feeding coaxial connectors 4 feed external radio frequency signals into the sub-wavelength antenna unit positioned in the first quadrant, the sub-wavelength antenna unit positioned in the second quadrant, the sub-wavelength antenna unit positioned in the third quadrant and the sub-wavelength antenna unit positioned in the fourth quadrant according to the phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees;

secondly, performing power synthesis on the electromagnetic waves generated by the four sub-wavelength antenna units in the step one in a free space to form a circularly polarized wave beam with wide wave beam and low wide angle-axis ratio;

and (III) radiating the electromagnetic waves of the circularly polarized beam with wide beam and low wide angle-axis ratio generated in the step (II) into free space.

The invention has small size, low section and light weight, and is very suitable for microsatellites with high important requirements on load; meanwhile, due to the fact that the section is low, the view field blocking of other antenna beams can be avoided; when the wide-angle scanning phased array antenna is used as an array element of the wide-angle scanning phased array antenna, the wide-angle scanning phased array antenna is easy to produce in batches, is low in cost and is beneficial to large-scale commercial use of a future phased array antenna system; the invention is easy to form circular polarization, avoids the superposition cancellation of the main signal and the reflected signal in the transmission process and reduces the transmission attenuation.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.