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

Weaken the high-frequency absorption antenna of back lobe impact

Technical field

The invention belongs to electromagnetic energy reception antenna technical field is and in particular to one kind is used for receiving RF energy in environment Weaken back lobe impact high-frequency absorption antenna.

Background technology

At home, start late with regard to the transmission technology research in the radio-frequency wireless energy confined space, rapidly send out in science and technology Today of exhibition, with the raising of economic progress and scientific research level, increasing company and scientific research institution begin to focus on and open The research of exhibition this respect, carries out the collection of radio frequency energy in the confined space.

Content of the invention

Present invention solves the technical problem that there is provided a kind of simple and reasonable in design height weakening back lobe impact of structure Frequency absorbs antenna, the less size having for the more other antenna of this antenna, the loss of relatively low clawback, good impedance Coupling and higher gain.

The present invention is to solve above-mentioned technical problem to adopt the following technical scheme that, weakens the high-frequency absorption antenna of back lobe impact, It is characterized in that including consistent size and dielectric passivation bonded to each other, medium substrate and earth plate from top to bottom, wherein with It is pasted with metal antenna paster, the middle part of medium substrate is provided with and extends vertically through Jie on the medium substrate of dielectric passivation laminating side The cylindrical metal conductor of matter substrate and four cylindrical cavities, earth plate is provided with concentric with cylindrical metal conductor bottom surface Circular hole；The material of described dielectric passivation is Rogers RO6002, permittivity ε_r=2.94, thickness d=0.51mm, length It is 30mm with width；The radius of the circular coverage rate of described metal antenna paster is 0.11312 λ, and wherein λ=122mm, λ are The wavelength of 2.45GHz radio frequency, thickness is 0.02mm, and material is copper, and the material of described medium substrate is Rogers RO6010, dielectric Constant ε_r=10.2, thickness d=2.54mm, length and width is 30mm, on the central point of metal antenna paster and medium substrate The center position on surface is consistent；The design shape of described metal antenna paster and size meet following requirement, set up flat square Coordinate system, by (0mm, -2.5mm) as starting point, (13.75mm, -2.5mm) be another end points along x-axis positive direction make one a length of The line segment one of 13.75mm, with point (13.75mm, -2.5mm) for 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 be Symmetry axis is made minute surface and is symmetrically obtained point L (6.1222mm, -14.72057mm), and line segment one is made mirror with straight line y=-x for symmetry axis Face symmetrically obtains line segment two, and the intersection point of line segment one and line segment two is Difference tie point H (14.72057mm, -6.1222mm),And L (6.1222mm, -14.72057mm),Obtain line segment HW and line segment LW, again by initial 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) be first curve the center of circle, with (2.5mm, 0mm) be end point, with (3.75mm, -1.25mm) be 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) be second curve the center of circle, with (3.75mm, -1.25mm) be end point, with (6.25mm, -1.25mm) be another End points, radius r₂=1.25mm, make angle of circumference be 180 °, direction be to y-axis negative direction protrude circular arc, then with (7.5mm, -1.25mm) is the center of circle of the 3rd curve, with (6.25mm, -1.25mm) for end point, with (7.5mm, 0mm) is Another end points, radius r₃=1.25mm, makes angle of circumference and is 90 °, and direction is the circle protruding to x-axis negative direction and y-axis positive direction Arc, the center of circle being the 4th curve with (7.5mm, -2.5mm), with (7.5mm, 0mm) for end point, with (10mm, -2.5mm) be Another end points, radius r₄=2.5mm, makes angle of circumference and is 90 °, and direction is the circular arc protruding to x-axis and y-axis positive direction；With (13.75mm, -2.5mm) is the center of circle of the 5th curve, with (10mm, -2.5mm) be end point, with H (14.72057mm, - It is 6.1222mm) another end points, radius r₅=3.75mm, makes angle of circumference and is 105 °, direction is convex to x-axis and y-axis negative direction The circular arc going out obtains initial graphics one, with straight line y=-x as symmetry axis, initial graphics one is carried out minute surface symmetrically, obtains initial Figure two, line segment HW, line segment LW, initial graphics one and initial graphics two merge and obtain rotating graphs one, by rotating graphs one with PointFor the point of rotation, clockwise successively 60 ° of rotation, 120 °, 180 °, 240 ° and 300 °, respectively obtain rotating graphs two, rotating graphs three, rotating graphs four, rotating graphs five and rotating graphs six, rotation Turn figure one, rotating graphs two, rotating graphs three, rotating graphs four, rotating graphs five and the rotating graphs six directions and closed Figure, the circular coverage rate reduced radius of closed figure are that original 0.77234 times obtains setting of required metal antenna paster Meter shape and size, obtain metal antenna paster according to design shape and size cutting；Four cylinders on described medium substrate The radius of hole is 0.5mm, and the circle center line connecting of four cylindrical cavities constitutes the square that the length of side is 22mm, on this square Following and the upper and lower side of medium substrate vertical range is respectively 2.8mm and 5.2mm, and square left and right side is left with medium substrate The vertical range of right both sides is respectively 2mm and 6mm；One end of described cylindrical metal conductor is connected with metal antenna paster, circle The material of cylindricality metallic conductor is copper, its bottom surface radius r=0.5mm, thickness d=2.54mm, cylindrical metal conductor and metal The junction center of circle of antenna patch is respectively 16.48mm, 16.48mm, 13.52mm with the vertical range of four sides of medium substrate And 13.52mm, the aperture R=1.9mm of circular hole on the earth plate relative with cylindrical metal conductor, described cylindrical metal conductor The output interface of the other end is connected with energy management circuit, and this energy management circuit is used for being stored the energy absorbing.

The technique effect of the present invention is：The high-frequency absorption antenna weakening back lobe impact has lower return loss, good Impedance matching and standing-wave ratio and higher gain such that it is able to RF energy in efficient reception environment.

Brief description

Fig. 1 is the structural representation of metal antenna paster；

Fig. 2 is the high-frequency absorption antenna structure view weakening back lobe impact；

Fig. 3 is that the echo of the high-frequency absorption antenna weakening back lobe impact using the simulation of HFSS antenna modeling simulation software damages Consumption figure；

Fig. 4 is the high-frequency absorption antenna feed impedance weakening back lobe impact using the simulation of HFSS antenna modeling simulation software Figure.

In figure：1st, dielectric passivation, 2, medium substrate, 3, earth plate, 4, metal antenna paster, 5, cylindrical metal leads Body, 6, cylindrical cavity, 7, circular hole.

Specific embodiment

Below in conjunction with the accompanying drawing in the present invention, the technical scheme in specific implementation process of the present invention is carried out clear, complete Whole, specific description.

The core of this invention is the high-frequency absorption Antenna Design weakening back lobe impact, needs in microstrip antenna designs Size on the metal antenna paster of the high-frequency absorption antenna weakening back lobe impact, the size of medium substrate, thickness carry out theory On estimation, more quickly accurately could find when simulated experiment suitable CF weakens back lobe impact height Frequency absorbs antenna.So below, the theoretical calculation method of explanation each data parameters of microstrip antenna. taking rectangular microstrip antenna as a example.

Patch size L × W, patch width W is：

$W=\frac{c}{2f_0}{\left(\frac{{\mathrm{\ϵ}}_r+1}{2}\right)}^{-\frac{1}{2}}---\left(1\right)$

In (1) formula, c is the light velocity, f₀For forbidden band centre frequency, ε_rFor relative dielectric constant.

The relative efficiency permittivity ε of microstrip antenna medium substrate_reFor：

${\mathrm{\ϵ}}_{re}=\frac{{\mathrm{\ϵ}}_r+1}{2}+\frac{{\mathrm{\ϵ}}_r-1}{2}{(1+\frac{12h}{W})}^{-\frac{1}{2}}---\left(2\right)$

H represents thickness of dielectric layers, and in order to reduce the impact to antenna performance for the surface wave, the thickness of dielectric substrate should Meet theoretical calculation formula：

$h\≤\frac{0.3c}{2{\mathrm{\πf}}_u\sqrt{{\mathrm{\ϵ}}_r}}---\left(3\right)$

Wherein f_uHighest frequency for the work of microstrip antenna.

The equivalent radiated power gap length Δ L of microstrip antenna is：

$\mathrm{\Δ}L=0.412h\frac{({\mathrm{\ϵ}}_{re}+0.3)(W/h+0.264)}{({\mathrm{\ϵ}}_{re}-0.258)(W/h+0.8)}---\left(4\right)$

Then length L of microstrip antenna paster is：

$L=\frac{c}{2f_0}\frac{1}{\sqrt{{\mathrm{\ϵ}}_{re}}}-2\mathrm{\Δ}L---\left(5\right)$

Size L of earth plate_g×W_gMeet following theoretical formula

L_g≥L+6h (6)

W_g≥W+6h (7)

Rectangular microstrip antenna be that coaxial line is fed, after determining the length and width of rectangular patch, typically The normal impedance of 50 Ω is added in microstrip antenna.

As shown in Figure 1-2, weaken the high-frequency absorption antenna of back lobe impact, including consistent size from top to bottom and bonded to each other Dielectric passivation 1, medium substrate 2 and earth plate 3, the medium substrate 2 of side of wherein fitting with dielectric passivation 1 is pasted with Metal antenna paster 4, the middle part of medium substrate 2 is provided with the cylindrical metal conductor 5 extending vertically through medium substrate 2 and four cylinders Shape hole 6, earth plate 3 is provided with the circular hole 7 concentric with cylindrical metal conductor 5 bottom surface；The material of described dielectric passivation 1 is Rogers RO6002, permittivity ε_r=2.94, thickness d=0.51mm, length and width is 30mm；Described metal antenna The radius of the circular coverage rate of paster 4 is 0.11312 λ, and wherein λ=122mm, λ are the wavelength of 2.45GHz radio frequency, and thickness is 0.02mm, material is copper, and the material of described medium substrate 2 is Rogers RO6010, permittivity ε_r=10.2, thickness d= 2.54mm, length and width is 30mm, the center position of the central point of metal antenna paster 4 and medium substrate 2 upper surface Unanimously；The design shape of described metal antenna paster 4 and size meet following requirement, set up plane right-angle coordinate, will (0mm, -2.5mm), as starting point, (13.75mm, -2.5mm) makes an a length of 13.75mm for another end points along x-axis positive direction Line segment one, with point (13.75mm, -2.5mm) be 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 first The center of circle of individual curve, with (2.5mm, 0mm) for end point, with (3.75mm, -1.25mm) for another end points, radius r₁=1.25mm, Make angle of circumference and be 90 °, direction is the circular arc protruding to x-axis and y-axis positive direction, is second curve with (5mm, -1.25mm) The center of circle, with (3.75mm, -1.25mm) for end point, with (6.25mm, -1.25mm) for another end points, radius r₂=1.25mm, Make angle of circumference and be 180 °, direction is the circular arc protruding to y-axis negative direction, then with (7.5mm, -1.25mm) for the 3rd song The center of circle of line, with (6.25mm, -1.25mm) for end point, with (7.5mm, 0mm) for another end points, radius r₃=1.25mm, makes Angle of circumference is 90 °, and direction is the circular arc protruding to x-axis negative direction and y-axis positive direction, with (7.5mm, -2.5mm) for the 4th curve The center of circle, with (7.5mm, 0mm) be end point, with (10mm, -2.5mm) be another end points, radius r₄=2.5mm, makes angle of circumference For 90 °, direction is the circular arc protruding to x-axis and y-axis positive direction；The center of circle being the 5th curve with (13.75mm, -2.5mm), with (10mm, -2.5mm) is end point, with H (14.72057mm, -6.1222mm) for another end points, radius r₅=3.75mm, makes circle Round angle is 105 °, and direction is that the circular arc protruding to x-axis and y-axis negative direction obtains initial graphics one, with straight line y=-x as symmetry axis, Initial graphics one are carried out minute surface symmetrically, obtains initial graphics two, line segment HW, line segment LW, initial graphics one and initial graphics two are closed And obtain rotating graphs one, by rotating graphs one with pointFor rotation Point, rotates 60 °, 120 °, 180 °, 240 ° and 300 ° clockwise successively, respectively obtains rotating graphs two, rotating graphs three, rotation Figure four, rotating graphs five and rotating graphs six, rotating graphs one, rotating graphs two, rotating graphs three, rotating graphs four, rotation Turn figure five and the rotating graphs six directions and obtain closed figure, the circular coverage rate reduced radius of closed figure are original 0.77234 times of design shape obtaining required metal antenna paster 4 and size, obtain metal according to design shape and size cutting Antenna patch 4；On described medium substrate 2, the radius of four cylindrical cavities 6 is 0.5mm, the center of circle of four cylindrical cavities 6 Line constitutes the square that the length of side is 22mm, on this square following with medium substrate about 2 the vertical range of side be respectively 2.8mm and 5.2mm, square left and right side is respectively 2mm and 6mm with the vertical range of medium substrate 2 left and right sides；Described circle One end of cylindricality metallic conductor 5 is connected with metal antenna paster 4, and the material of cylindrical metal conductor 5 is copper, its bottom surface radius r =0.5mm, thickness d=2.54mm, the junction center of circle of cylindrical metal conductor 5 and metal antenna paster 4 and medium substrate 2 four The vertical range of bar side is respectively 16.48mm, 16.48mm, 13.52mm and 13.52mm, relative with cylindrical metal conductor 5 Earth plate 3 on circular hole 7 aperture R=1.9mm, the output interface of described cylindrical metal conductor 5 other end and energy management Circuit is connected, and this energy management circuit is used for being stored the energy absorbing.

Fig. 3 is that the echo of the high-frequency absorption antenna weakening back lobe impact using the simulation of HFSS antenna modeling simulation software damages Consumption figure, as seen from the figure, the return loss that this weakens the high-frequency absorption antenna of back lobe impact is -37dB, than other same volume skies The return loss of line is also little, and performance is very good.

Fig. 4 is the high-frequency absorption antenna feed impedance weakening back lobe impact using the simulation of HFSS antenna modeling simulation software Figure, as seen from the figure, the high-frequency absorption antenna that this weakens back lobe impact is 47.88 Ω in the input impedance of 2.45GHz, closely Normal impedance 50 Ω.

Embodiment above describes general principle, principal character and the advantage of the present invention, the technical staff of the industry should Understand, the present invention is not restricted to the described embodiments, the simply explanation present invention's described in above-described embodiment and specification is former Reason, under the scope without departing from the principle of the invention, the present invention also has various changes and modifications, and these changes and improvements each fall within In the scope of protection of the 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.