CN106384872A - High frequency absorption antenna for reducing back lobe influence - Google Patents

Abstract

The invention relates to a high frequency absorption antenna for reducing back lobe influence, the antenna comprises a dielectric covering layer, a dielectric substrate and a ground plate which have the same size from top to bottom and are fit each other, wherein a metal antenna patch is fit the dielectric substrate of which one side fit the dielectric covering layer, a cylinder-shaped metallic conductor and four cylinder-shaped holes are arranged on the middle of the dielectric substrate and vertically pass through the dielectric substrate, and a circular hole which is concentric with the bottom of the cylinder-shaped metallic conductor is arranged on the ground plate. According to the invention, the antenna has lower return loss, good impedance matching and standing-wave ratio and higher gain than before, so that the antenna can effectively receive radio frequency energy in environment.

Description

High Frequency Absorbing Antenna with Reduced Back Lobe Effect

technical field

The invention belongs to the technical field of electromagnetic energy receiving antennas, and in particular relates to a high-frequency absorbing antenna used for receiving radio frequency energy in an environment and weakening the influence of back lobe.

Background technique

In China, the research on the transmission technology of radio frequency wireless energy in a limited space started relatively late. Today, with the rapid development of science and technology, with the progress of economy and the improvement of scientific research level, more and more companies and scientific research institutions have begun to pay attention to and develop this technology. Research on the field of radio frequency energy collection in a limited space.

Contents of the invention

The technical problem solved by the present invention is to provide a high-frequency absorbing antenna with simple structure and reasonable design to weaken the influence of the back lobe. Compared with other antennas, the antenna has smaller size, relatively lower callback loss, good Impedance matching and higher gain.

In order to solve the above technical problems, the present invention adopts the following technical scheme, the high-frequency absorbing antenna that weakens the influence of the back lobe, is characterized in that it includes a dielectric covering layer, a dielectric substrate and a ground plate that are consistent in size from top to bottom and are attached to each other. A metal antenna patch is attached to the dielectric substrate on the bonding side of the cover layer. A cylindrical metal conductor and four cylindrical holes are provided in the middle of the dielectric substrate, and a cylindrical metal conductor is provided on the ground plate. Concentric circular holes on the bottom surface; the material of the dielectric covering layer is Rogers RO6002, the dielectric constant ε _r =2.94, the thickness d=0.51mm, and the length and width are 30mm; the radius of the circular covering surface of the metal antenna patch is 0.11312λ, wherein λ=122mm, λ is the wavelength of 2.45GHz radio frequency, the thickness is 0.02mm, and the material is copper, the material of the dielectric substrate is Rogers RO6010, the dielectric constant ε _r =10.2, and the thickness d=2.54mm, Both length and width are 30mm, and the center point of the metal antenna patch is consistent with the center point position of the upper surface of the dielectric substrate; the design shape and size of the metal antenna patch meet the following requirements, and a plane Cartesian coordinate system is established, with (0mm, -2.5mm) as the starting point, (13.75mm, -2.5mm) as the other end point, make a line segment 1 with a length of 13.75mm along the positive direction of the x-axis, and take the point (13.75mm, -2.5mm) as the rotation point, and place Line segment 1 is rotated 105° counterclockwise, and the curve equation The point of intersection is H (14.72057mm, -6.1222mm), and the point L (6.1222mm, -14.72057mm) is obtained by taking the straight line y=-x as the axis of symmetry for mirror symmetry, and the line segment one is made as the axis of symmetry of the line y=-x Mirror symmetry to get line segment 2, the intersection point of line segment 1 and line segment 2 is Respectively connecting point H (14.72057mm, -6.1222mm), and L(6.1222mm, -14.72057mm), Get the line segment HW and line segment LW, take the origin (0mm, 0mm) as the starting point again, make a line segment with a length of 2.5mm along the positive direction of the x-axis, take (2.5mm, -1.25mm) as the center of the first curve, and (2.5mm, 0mm) as one end point, (3.75mm, -1.25mm) as the other end point, radius r ₁ = 1.25mm, make a circular angle of 90°, and the direction is convex to the positive direction of x-axis and y-axis The arc, with (5mm, -1.25mm) as the center of the second curve, with (3.75mm, -1.25mm) as one end point, with (6.25mm, -1.25mm) as the other end point, radius r ₂ =1.25mm, make a circular arc with a circumference angle of 180° and a direction protruding toward the negative direction of the y-axis, then take (7.5mm, -1.25mm) as the center of the third curve, and take (6.25mm, -1.25mm) ) as one end point, (7.5mm, 0mm) as the other end point, radius r ₃ =1.25mm, make a circular arc with a circular angle of 90° and a direction protruding toward the negative direction of the x-axis and the positive direction of the y-axis, with (7.5mm, -2.5mm) is the center of the fourth curve, with (7.5mm, 0mm) as one end point, (10mm, -2.5mm) as the other end point, radius r ₄ =2.5mm, and make a circle angle is 90°, and the direction is a circular arc protruding toward the positive direction of x-axis and y-axis; with (13.75mm, -2.5mm) as the center of the fifth curve, with (10mm, -2.5mm) as one end point, and H(14.72057mm, -6.1222mm) is the other end point, the radius r ₅ =3.75mm, make a circular arc with a circular angle of 105°, and the direction is to protrude toward the negative direction of the x-axis and y-axis to obtain the initial figure 1, and use a straight line y=-x is the symmetry axis, the initial figure 1 is mirror-symmetrical to obtain the initial figure 2, the line segment HW, the line segment LW, the initial figure 1 and the initial figure 2 are combined to obtain the rotation figure 1, and the rotation figure 1 is represented by a point is the rotation point, rotate 60°, 120°, 180°, 240° and 300° clockwise, respectively, to obtain the rotation figure 2, the rotation figure 3, the rotation figure 4, the rotation figure 5 and the rotation figure 6, the rotation figure 1, the rotation Figure 2, Rotation Figure 3, Rotation Figure 4, Rotation Figure 5 and Rotation Figure 6 are combined to obtain a closed figure, and the circular coverage radius of the closed figure is reduced to 0.77234 times of the original to obtain the design shape and size of the required metal antenna patch, The metal antenna patch is cut according to the design shape and size; the radius of the four cylindrical holes on the dielectric substrate is 0.5mm, and the connecting lines of the centers of the four cylindrical holes form a square with a side length of 22mm, and the upper and lower sides of the square The vertical distances from the upper and lower sides of the dielectric substrate are 2.8mm and 5.2mm respectively, and the vertical distances between the left and right sides of the square and the left and right sides of the dielectric substrate are 2mm and 6mm respectively; one end of the cylindrical metal conductor is connected to the metal antenna patch , the material of the cylindrical metal conductor is copper, the radius of the bottom surface r=0.5mm, the thickness d=2.54mm, the vertical distance between the center of the connection between the cylindrical metal conductor and the metal antenna patch and the four sides of the dielectric substrate is 16.48mm respectively , 16.48mm, 13.52mm and 13.52mm, the aperture R=1.9mm of the circular hole on the ground plate opposite to the cylindrical metal conductor, the output interface at the other end of the cylindrical metal conductor is connected to the energy management circuit, the energy management circuit Used to store the absorbed energy.

The technical effect of the invention is that the high-frequency absorbing antenna with weakened back lobe has lower return loss, good impedance matching, standing wave ratio and high gain, thereby being able to efficiently receive radio frequency energy in the environment.

Description of drawings

Fig. 1 is a structural schematic diagram of a metal antenna patch;

Figure 2 is a schematic diagram of the structure of a high-frequency absorbing antenna that weakens the influence of the back lobe;

Fig. 3 is the return loss diagram of the high-frequency absorbing antenna with weakened back lobe effect simulated by HFSS antenna simulation software;

Fig. 4 is the input impedance diagram of the high-frequency absorbing antenna simulated by HFSS antenna simulation software to weaken the effect of the back lobe.

In the figure: 1. Dielectric covering layer, 2. Dielectric substrate, 3. Grounding plate, 4. Metal antenna patch, 5. Cylindrical metal conductor, 6. Cylindrical hole, 7. Round hole.

detailed description

The technical solutions in the specific implementation process of the present invention will be clearly, completely and specifically described below in conjunction with the accompanying drawings in the present invention.

The core part of this invention is the design of the high-frequency absorbing antenna that weakens the influence of the back lobe. In the design of the microstrip antenna, the size of the metal antenna patch of the high-frequency absorbing antenna that weakens the influence of the back lobe, and the size and thickness of the dielectric substrate need to be theoretically In order to find the high-frequency absorbing antenna suitable for a specific frequency and weaken the influence of the back lobe more quickly and accurately during the simulation experiment. So the following takes the rectangular microstrip antenna as an example to explain the theoretical calculation method of each data parameter of the microstrip antenna.

The patch size is L×W, and the patch width W is:

$\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In (1), c is the speed of light, f ₀ is the center frequency of the forbidden band, and ε _r is the relative permittivity.

The relative effective permittivity ε _re of the dielectric substrate of the microstrip antenna is:

${\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; e</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 12</span>}\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; W</span>}}<span\; class="notranslate">\; )</span>}^{<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

h represents the thickness of the dielectric layer. In order to reduce the influence of surface wave radiation on the performance of the antenna, the thickness of the dielectric substrate should satisfy the following theoretical calculation formula:

$\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; 0.3</span>}\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; \&pi;f</span>}}_{\mathrm{<span\; class="notranslate">\; u</span>}}\sqrt{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them f _u is the highest working frequency of the microstrip antenna.

The equivalent radiation slot length ΔL of the microstrip antenna is:

$\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.412</span>}\mathrm{<span\; class="notranslate">\; h</span>}\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; e</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 0.3</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 0.264</span>}<span\; class="notranslate">\; )</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; e</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 0.258</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 0.8</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Then the length L of the microstrip antenna patch is:

$\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; e</span>}}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

The size of the ground plate L _g × W _g satisfies the following theoretical formula

_Lg≥L +6h (6)

_Wg≥W +6h (7)

The rectangular microstrip antenna uses a coaxial line for feeding. After the length and width of the rectangular patch are determined, a standard impedance of 50Ω is generally added to the microstrip antenna.

As shown in Figure 1-2, the high-frequency absorbing antenna that weakens the influence of the back lobe includes a dielectric covering layer 1, a dielectric substrate 2, and a ground plate 3 that are consistent in size from top to bottom and are attached to each other. A metal antenna patch 4 is attached to the dielectric substrate 2 on one side, a cylindrical metal conductor 5 and four cylindrical holes 6 vertically penetrating the dielectric substrate 2 are provided in the middle of the dielectric substrate 2, and a ground plate 3 is provided with a The concentric circular hole 7 on the bottom surface of the cylindrical metal conductor 5; the material of the dielectric covering layer 1 is Rogers RO6002, the dielectric constant ε _r =2.94, the thickness d=0.51mm, and the length and width are 30mm; the metal antenna paste The radius of the circular covering surface of sheet 4 is 0.11312λ, where λ=122mm, λ is the wavelength of 2.45GHz radio frequency, the thickness is 0.02mm, and the material is copper. The material of the dielectric substrate 2 is Rogers RO6010, and the dielectric constant ε _r =10.2, thickness d=2.54mm, length and width are 30mm, the center point of the metal antenna patch 4 is consistent with the center point of the upper surface of the dielectric substrate 2; the design shape and size of the metal antenna patch 4 satisfy the following It is required to establish a plane Cartesian coordinate system, take (0mm, -2.5mm) as the starting point, and (13.75mm, -2.5mm) as the other end point to make a line segment 1 with a length of 13.75mm along the positive direction of the x-axis, and take the point ( 13.75mm, -2.5mm) is the rotation point, rotate the line segment 105° counterclockwise, and the curve equation The point of intersection is H (14.72057mm, -6.1222mm), and the point L (6.1222mm, -14.72057mm) is obtained by taking the straight line y=-x as the axis of symmetry for mirror symmetry, and the line segment one is made as the axis of symmetry of the line y=-x Mirror symmetry to get line segment 2, the intersection point of line segment 1 and line segment 2 is Respectively connecting point H (14.72057mm, -6.1222mm), and L(6.1222mm, -14.72057mm), Get the line segment HW and line segment LW, take the origin (0mm, 0mm) as the starting point again, make a line segment with a length of 2.5mm along the positive direction of the x-axis, take (2.5mm, -1.25mm) as the center of the first curve, and (2.5mm, 0mm) as one end point, (3.75mm, -1.25mm) as the other end point, radius r ₁ = 1.25mm, make a circular angle of 90°, and the direction is convex to the positive direction of x-axis and y-axis The arc, with (5mm, -1.25mm) as the center of the second curve, with (3.75mm, -1.25mm) as one end point, with (6.25mm, -1.25mm) as the other end point, radius r ₂ =1.25mm, make a circular arc with a circumference angle of 180° and a direction protruding toward the negative direction of the y-axis, then take (7.5mm, -1.25mm) as the center of the third curve, and take (6.25mm, -1.25mm) ) as one end point, (7.5mm, 0mm) as the other end point, radius r ₃ =1.25mm, make a circular arc with a circular angle of 90° and a direction protruding toward the negative direction of the x-axis and the positive direction of the y-axis, with (7.5mm, -2.5mm) is the center of the fourth curve, with (7.5mm, 0mm) as one end point, (10mm, -2.5mm) as the other end point, radius r ₄ =2.5mm, and make a circle angle is 90°, and the direction is a circular arc protruding toward the positive direction of x-axis and y-axis; with (13.75mm, -2.5mm) as the center of the fifth curve, with (10mm, -2.5mm) as one end point, and H(14.72057mm, -6.1222mm) is the other end point, the radius r ₅ =3.75mm, make a circular arc with a circular angle of 105°, and the direction is to protrude toward the negative direction of the x-axis and y-axis to obtain the initial figure 1, and use a straight line y=-x is the symmetry axis, the initial figure 1 is mirror-symmetrical to obtain the initial figure 2, the line segment HW, the line segment LW, the initial figure 1 and the initial figure 2 are combined to obtain the rotation figure 1, and the rotation figure 1 is represented by a point is the rotation point, rotate 60°, 120°, 180°, 240° and 300° clockwise, respectively, to obtain the rotation figure 2, the rotation figure 3, the rotation figure 4, the rotation figure 5 and the rotation figure 6, the rotation figure 1, the rotation Figure 2, Rotation Figure 3, Rotation Figure 4, Rotation Figure 5 and Rotation Figure 6 are combined to obtain a closed figure, and the radius of the circular coverage of the closed figure is reduced to 0.77234 times of the original to obtain the design shape and size of the required metal antenna patch 4 , cutting according to the design shape and size to obtain the metal antenna patch 4; the radius of the four cylindrical holes 6 on the dielectric substrate 2 is 0.5mm, and the connecting lines of the centers of the four cylindrical holes 6 form a square with a side length of 22mm , the vertical distances between the upper and lower sides of the square and the upper and lower sides of the dielectric substrate 2 are 2.8mm and 5.2mm respectively, and the vertical distances between the left and right sides of the square and the left and right sides of the dielectric substrate 2 are 2mm and 6mm respectively; the cylindrical metal conductor 5 One end of one end is connected with metal antenna patch 4, and the material of cylindrical metal conductor 5 is copper, and its bottom surface radius r=0.5mm, thickness d=2.54mm, and the center of circle of the junction of cylindrical metal conductor 5 and metal antenna patch 4 and The vertical distances of the four sides of the dielectric substrate 2 are 16.48mm, 16.48mm, 13.52mm and 13.52mm respectively, and the diameter of the round hole 7 on the ground plate 3 opposite to the cylindrical metal conductor 5 is R=1.9mm. The output interface at the other end of the conductor 5 is connected to the energy management circuit, and the energy management circuit is used for storing the absorbed energy.

Figure 3 is the return loss diagram of the high-frequency absorbing antenna with weakened back-lobe effect simulated by HFSS antenna simulation software. It can be seen from the figure that the return loss of the high-frequency absorber antenna with reduced back-lobe effect is -37dB, which is higher than other The return loss of the antenna with the same volume is even smaller, and the performance is very good.

Figure 4 is the input impedance diagram of the high-frequency absorbing antenna with reduced back-lobe effect simulated by HFSS antenna simulation software. It can be seen from the figure that the input impedance of the high-frequency absorber antenna with reduced back-lobe effect at 2.45GHz is 47.88Ω, which is very close to Standard impedance 50Ω.

The above embodiments have described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What are described in the above embodiments and description are only to illustrate the principles of the present invention. Without departing from the scope of the principle of the present invention, there will be various changes and improvements in the present invention, and these changes and improvements all fall within the protection scope of the present invention.

Claims (1)

1. weaken the high-frequency absorption antenna of back lobe impact it is characterised in that including consistent size and Jie bonded to each other from top to bottom Matter cover layer, medium substrate and earth plate, the medium substrate of side of wherein fitting with dielectric passivation is pasted with metal antenna Paster, the middle part of medium substrate is provided with the cylindrical metal conductor extending vertically through medium substrate and four cylindrical cavities, ground connection Plate is provided with the circular hole concentric with cylindrical metal conductor bottom surface；The material of described dielectric passivation is Rogers RO6002, is situated between Electric constant ε_r=2.94, thickness d=0.51mm, length and width is 30mm；The circular coverage rate of described metal antenna paster Radius be 0.11312 λ, wherein λ=122mm, λ be 2.45GHz radio frequency wavelength, thickness be 0.02mm, material be copper, described The material of medium substrate is Rogers RO6010, permittivity ε_r=10.2, thickness d=2.54mm, length and width is 30mm, the central point of metal antenna paster is consistent with the center position of medium substrate upper surface；Described metal antenna paster Design shape and size meet following requirement, set up plane right-angle coordinate, by (0mm, -2.5mm) as starting point, (13.75mm, -2.5mm) is that another end points makes the line segment one of an a length of 13.75mm along x-axis positive direction, with point (13.75mm, -2.5mm) is the point of rotation, line segment one is rotated 105 ° in the counterclockwise direction, with curvilinear equationIntersection point be H (14.72057mm, -6.1222mm), with straight line y=-x for symmetry axis make Minute surface symmetrically obtains point L (6.1222mm, -14.72057mm), line segment one is made minute surface with straight line y=-x for symmetry axis symmetrical To line segment two, the intersection point of line segment one and line segment two isConnect respectively Point H (14.72057mm, -6.1222mm),With L (6.1222mm ,- 14.72057mm)、Obtain line segment HW and line segment LW, again will be former Point (0mm, 0mm), as starting point, makes the line segment of an a length of 2.5mm along x-axis positive direction, with (2.5mm, -1.25mm) for the The center of circle of one curve, with (2.5mm, 0mm) for end point, with (3.75mm, -1.25mm) for another end points, radius r₁= 1.25mm, makes angle of circumference and is 90 °, and direction is the circular arc protruding to x-axis and y-axis positive direction, with (5mm, -1.25mm) for second The center of circle of individual curve, with (3.75mm, -1.25mm) for end point, with (6.25mm, -1.25mm) for another end points, radius r₂= 1.25mm, makes angle of circumference and is 180 °, and direction is the circular arc protruding to y-axis negative direction, then with (7.5mm, -1.25mm) for the The center of circle of three curves, with (6.25mm, -1.25mm) for end point, with (7.5mm, 0mm) for another end points, radius r₃=1.25mm, Make angle of circumference and be 90 °, direction is the circular arc protruding to x-axis negative direction and y-axis positive direction, with (7.5mm, -2.5mm) for the 4th The center of circle of curve, with (7.5mm, 0mm) for end point, with (10mm, -2.5mm) for another end points, radius r₄=2.5mm, makes circle Round angle is 90 °, and direction is the circular arc protruding to x-axis and y-axis positive direction；The circle being the 5th curve with (13.75mm, -2.5mm) The heart, with (10mm, -2.5mm) for end point, with H (14.72057mm, -6.1222mm) for another end points, radius r₅=3.75mm, makees Go out angle of circumference and be 105 °, direction is that the circular arc protruding to x-axis and y-axis negative direction obtains initial graphics one, is right with straight line y=-x Claim axle, initial graphics one are carried out minute surface symmetrically, obtains initial graphics two, line segment HW, line segment LW, initial graphics one and initial graph Shape two merges and obtains rotating graphs one, by rotating graphs one with point For the point of rotation, rotate 60 °, 120 °, 180 °, 240 ° and 300 ° successively clockwise, respectively obtain rotating graphs two, rotating graphs 3rd, rotating graphs four, rotating graphs five and rotating graphs six, rotating graphs one, rotating graphs two, rotating graphs three, rotation figure Shape four, rotating graphs five and the rotating graphs six directions simultaneously obtain closed figure, and the circular coverage rate reduced radius of closed figure are 0.77234 times originally obtains design shape and the size of required metal antenna paster, obtains according to design shape and size cutting To metal antenna paster；On described medium substrate, the radius of four cylindrical cavities is 0.5mm, the circle of four cylindrical cavities Heart line constitutes the square that the length of side is 22mm, and on this square, the following vertical range with the upper and lower side of medium substrate is respectively 2.8mm and 5.2mm, square left and right side is respectively 2mm and 6mm with the vertical range of the medium substrate left and right sides；Described circle One end of cylindricality metallic conductor is connected with metal antenna paster, and the material of cylindrical metal conductor is copper, its bottom surface radius r= The junction center of circle of 0.5mm, thickness d=2.54mm, cylindrical metal conductor and metal antenna paster and four sides of medium substrate The vertical range on side is respectively 16.48mm, 16.48mm, 13.52mm and 13.52mm, the ground connection relative with cylindrical metal conductor The aperture R=1.9mm of circular hole on plate, the output interface of the described cylindrical metal conductor other end is connected with energy management circuit, This energy management circuit is used for being stored the energy absorbing.