CN106229666A - Five jiaos of radio-frequency antennas of low-loss - Google Patents

Abstract

The invention discloses a kind of five jiaos of radio-frequency antennas of low-loss, including consistent size from top to bottom and dielectric passivation bonded to each other, medium substrate and earth plate, wherein it is pasted with metal antenna paster, director and reflector with on the medium substrate of dielectric passivation laminating side, the middle part of medium substrate is provided with the cylindrical metal conductor extending vertically through medium substrate, and earth plate is provided with the circular hole concentric with cylindrical metal conductor bottom surface.The present invention has lower return loss, good impedance matching and standing-wave ratio and higher gain such that it is able to the radio-frequency (RF) energy in efficient reception environment.

Description

Five jiaos of radio-frequency antennas of low-loss

Technical field

The invention belongs to electromagnetic energy reception antenna technical field, be specifically related to a kind of for receiving radio-frequency (RF) energy in environment Five jiaos of radio-frequency antennas of low-loss.

Background technology

In intelligent building, each portion that the sensor node that each building is the most up to a hundred is distributed in building body Position, is used for monitoring the parameters such as temperature, brightness and flow of the people；Thering is provided power supply by wiring for these sensor nodes, its cost is Sufficiently expensive, and use battery main problems faced of powering is the most how to judge that the battery of which node has exhausted to go forward side by side Row is changed, and this is commercially difficult to accept, and using ambient radio-frequency energy collection technique to be aided with rechargeable battery is then its ratio Comparatively ideal power supply mode.

Summary of the invention

Present invention solves the technical problem that and there is provided a kind of simple in construction and five jiaos of radio frequency skies of low-loss reasonable in design Line, this antenna is compared with the less size having for other antenna, the loss of relatively low clawback, good impedance matching and relatively High gain.

The present invention solves that above-mentioned technical problem adopts the following technical scheme that, five jiaos of radio-frequency antennas of low-loss, its feature exists In including consistent size and dielectric passivation bonded to each other, medium substrate and earth plate from top to bottom, wherein with dielectric overlay Being pasted with metal antenna paster, director and reflector on the medium substrate of laminating unification side, the middle part of medium substrate is provided with vertical Directly running through the cylindrical metal conductor of medium substrate, earth plate is provided with the circular hole concentric with cylindrical metal conductor bottom surface；Institute The material stating dielectric passivation is Rogers RO6002, DIELECTRIC CONSTANT ε_r=2.94, thickness d=0.51mm, length and width is equal For 30mm；The radius of the circular coverage rate of described metal antenna paster is 0.0973 λ, wherein λ=122mm, and λ is that 2.45GHz penetrates The wavelength of 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, the central point of metal antenna paster and medium substrate upper surface Center position is consistent；Design shape and the size of described metal antenna paster meet following requirement, set up plane rectangular coordinates System, by initial point (0mm ,-2.5mm) as starting point, (13.75mm ,-2.5mm) be another end points along x-axis positive direction make one long For the line segment one of 13.75mm, with point (13.75mm ,-2.5mm) for the point of rotation, line segment one is rotated 99 ° in the counterclockwise direction, with Curvilinear equationIntersection point be H (14.3366mm ,-6.20383mm), be right with straight line y=-x Claim axle to make minute surface symmetry and obtain a L (6.20383mm ,-14.3366mm), line segment one is made minute surface with straight line y=-x for axis of symmetry Symmetry obtains line segment two, and the intersection point of line segment one and line segment two is Difference junction point H (14.3366mm ,-6.20383mm),And L (6.20383mm ,-14.3366mm),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) it is the center of circle of first curve, with (2.5mm, 0mm) for end point, is another end points with (3.75mm ,-1.25mm), Radius r₁=1.25mm, making angle of circumference is 90 °, and direction is the circular arc protruded to x-axis and y-axis positive direction, with (5mm ,- 1.25mm) it is the center of circle of second curve, with (3.75mm ,-1.25mm) for end point, with (6.25mm ,-1.25mm) for another End points, radius r₂=1.25mm, making angle of circumference is 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, making angle of circumference is 90 °, and direction is the circle protruded to x-axis negative direction and y-axis positive direction Arc, with the center of circle that (7.5mm ,-2.5mm) is the 4th curve, with (7.5mm, 0mm) for end point, with (10mm ,-2.5mm) be Another end points, radius r₄=2.5mm, making angle of circumference is 90 °, and direction is the circular arc protruded 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) for end point, with H (14.3366mm ,- 6.20383mm) it is another end points, radius r₅=3.75mm, making angle of circumference is 99 °, and direction is convex to x-axis and y-axis negative direction The circular arc gone out, obtains initial graphics one, with straight line y=-x as axis of symmetry, initial graphics one carries out minute surface symmetry, 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, rotate the most successively 72 °, 144 °, 216 ° and 288 °, respectively obtain rotating graphs two, rotating graphs three, rotating graphs four and rotating graphs five, rotating graphs one, rotating graphs Two, rotating graphs three, rotating graphs four and rotating graphs five merge, and obtain closed figure, by the circular coverage rate of closed figure Reduced radius is design shape and the size that original 0.7481 times obtains required metal antenna paster, according to design shape and chi Very little cutting obtains metal antenna paster；Described director is rectangular metal bar one, and the length and width of this rectangular metal bar one is divided Not Wei 10mm and 0.47mm, its long limit is parallel with the side up and down of medium substrate, and minor face is parallel with the left and right side of medium substrate, Central point is respectively 28.5mm and 1.5mm, central point and medium substrate left and right sides with the vertical dimension of the upper and lower side of medium substrate The vertical dimension on limit is respectively 15mm and 15mm, and described reflector is rectangular metal bar two, the length of this rectangular metal bar two and Width is respectively 18mm and 0.46mm, and its long limit is parallel with the side up and down of medium substrate, minor face and the left and right sides of medium substrate Limit is parallel, and central point is respectively 1.4mm and 28.6mm, central point and medium substrate with the vertical dimension of the upper and lower side of medium substrate The vertical dimension of left and right side is respectively 15mm and 15mm；One end of described cylindrical metal conductor is with metal antenna paster even Connecing, the material of cylindrical metal conductor is copper, its bottom surface radius r=0.5mm, thickness d=2.54mm, cylindrical metal conductor with The vertical dimension of the center of circle, junction of metal antenna paster and four sides of medium substrate be respectively 16.59mm, 16.59mm, 13.41mm and 13.41mm, the aperture R=1.9mm of circular hole, described cylinder on the earth plate relative with cylindrical metal conductor The output interface of the metallic conductor other end is connected with energy management circuit, and this energy management circuit is for entering the energy absorbed Row stores.

The technique effect of the present invention is: five jiaos of radio-frequency antennas of low-loss have lower return loss, good impedance Join and standing wave and higher gain such that it is able to the radio-frequency (RF) energy in efficient reception environment.

Accompanying drawing explanation

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

Fig. 2 is five jiaos of RF antenna structures schematic diagrams of low-loss；

Fig. 3 is the return loss plot of the five jiaos of radio-frequency antennas of low-loss utilizing the simulation of HFSS antenna modeling simulation software；

Fig. 4 is the five jiaos of radio-frequency antenna gain diagram of low-loss utilizing the simulation of HFSS antenna modeling simulation software.

In figure: 1, dielectric passivation, 2, medium substrate, 3, earth plate, 4, metal antenna paster, 5, reflector, 6, guide into Device, 7, cylindrical metal conductor, 8, circular hole.

Detailed description of the invention

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, concrete description.

The core of this invention is five jiaos of radio-frequency antenna designs of low-loss, needs low-loss when microstrip antenna designs The size of the metal antenna paster of five jiaos of radio-frequency antennas, the size of medium substrate, thickness carries out theoretic estimation, could be at mould Five jiaos of radio-frequency antennas of low-loss of applicable characteristic frequency are more quickly found accurately the when of draft experiment.So below with rectangle As a example by microstrip antenna, the theoretical calculation method of explanation each data parameters of microstrip antenna.

Patch size L × W, patch width W be:

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

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

The relative efficiency DIELECTRIC CONSTANT 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 surface wave impact on antenna performance, the thickness of dielectric substrate should Satisfied theoretical calculation formula once:

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

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

As shown in Figure 1-2, five jiaos of radio-frequency antennas of low-loss, cover including consistent size from top to bottom and medium bonded to each other Cap rock 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, director 6 and reflector 5, the middle part of medium substrate 2 is provided with the cylindrical metal conductor 7 extending vertically through medium substrate 2, Earth plate 3 is provided with the circular hole 8 concentric with cylindrical metal conductor 7 bottom surface；The material of described dielectric passivation 1 is Rogers RO6002, DIELECTRIC CONSTANT ε_r=2.94, thickness d=0.51mm, length and width is 30mm；Described metal antenna paster 4 The radius of circular coverage rate is 0.0973 λ, wherein λ=122mm, and λ is the wavelength of 2.45GHz radio frequency, and thickness is 0.02mm, material For copper, the material of described medium substrate 2 is Rogers RO6010, DIELECTRIC CONSTANT ε_r=10.2, thickness d=2.54mm, length and Width is 30mm, and the central point of metal antenna paster is consistent with the center position of medium substrate upper surface；Described metal sky The design shape of line paster 4 and size meet following requirement, set up plane right-angle coordinate, by initial point (0mm ,-2.5mm) conduct 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, in the counterclockwise direction line segment one is rotated 99 °, with curvilinear equationIntersection point be H (14.3366mm ,-6.20383mm), make mirror with straight line y=-x for axis of symmetry Face symmetry obtains a L (6.20383mm ,-14.3366mm), for axis of symmetry, line segment one is made minute surface symmetry with straight line y=-x and obtains Line segment two, the intersection point of line segment one and line segment two isJunction point respectively H (14.3366mm ,-6.20383mm),With L (6.20383mm ,- 14.3366mm)、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) for first The center of circle of individual curve, with (2.5mm, 0mm) for end point, is another end points with (3.75mm ,-1.25mm), radius r₁= 1.25mm, making angle of circumference is 90 °, and direction is the circular arc protruded 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, is another end points with (6.25mm ,-1.25mm), radius r₂= 1.25mm, making angle of circumference is 180 °, and direction is the circular arc protruded to y-axis negative direction, is then the with (7.5mm ,-1.25mm) The center of circle of three curves, with (6.25mm ,-1.25mm) for end point, is another end points with (7.5mm, 0mm), radius r₃= 1.25mm, making angle of circumference is 90 °, and direction is the circular arc protruded to x-axis negative direction and y-axis positive direction, with (7.5mm ,- 2.5mm) it is the center of circle of the 4th curve, with (7.5mm, 0mm) for end point, is another end points with (10mm ,-2.5mm), radius r₄=2.5mm, making angle of circumference is 90 °, and direction is the circular arc protruded to x-axis and y-axis positive direction；With (13.75mm ,-2.5mm) It is the center of circle of the 5th curve, with (10mm ,-2.5mm) for end point, with H (14.3366mm ,-6.20383mm) for the other end Point, radius r₅=3.75mm, making angle of circumference is 99 °, and direction is the circular arc protruded to x-axis and y-axis negative direction, obtains initial graph Shape one, with straight line y=-x as axis of symmetry, carries out initial graphics one minute surface symmetry, obtains initial graphics two, line segment HW, line segment LW, initial graphics one and initial graphics two merging obtain rotating graphs one, by rotating graphs one with pointFor the point of rotation, rotate the most successively 72 °, 144 °, 216 ° and 288 °, respectively obtain rotating graphs two, rotating graphs three, rotating graphs four and rotating graphs five, rotating graphs one, rotating graphs Two, rotating graphs three, rotating graphs four and rotating graphs five merge, and obtain closed figure, by the circular coverage rate of closed figure Reduced radius is design shape and the size that original 0.7481 times obtains required metal antenna paster 4, according to design shape and Size cutting obtains metal antenna paster 4；Described director 6 is rectangular metal bar one, the length of this rectangular metal bar one and width Degree is respectively 10mm and 0.47mm, and its long limit is parallel with the side up and down of medium substrate 2, minor face and the left and right sides of medium substrate 2 Limit is parallel, and central point is respectively 28.5mm and 1.5mm, central point and medium base with the vertical dimension of medium substrate about 2 side The vertical dimension of plate about 2 side is respectively 15mm and 15mm, and described reflector 5 is rectangular metal bar two, this rectangular metal bar The length and width of two is respectively 18mm and 0.46mm, and its long limit is parallel with the side up and down of medium substrate 2, minor face and medium base The left and right side of plate 2 is parallel, and central point is respectively 1.4mm and 28.6mm, center with the vertical dimension of medium substrate about 2 side Point is respectively 15mm and 15mm with the vertical dimension of medium substrate about 2 side；One end of described cylindrical metal conductor 7 and gold Belonging to antenna patch 4 to connect, the material of cylindrical metal conductor 7 is copper, its bottom surface radius r=0.5mm, thickness d=2.54mm, circle Cylindricality metallic conductor 7 is respectively with the vertical dimension of 2 four sides of medium substrate with the center of circle, junction of metal antenna paster 4 16.59mm, 16.59mm, 13.41mm and 13.41mm, the aperture R of circular hole 8 on the earth plate 3 relative with cylindrical metal conductor 7 =1.9mm, the output interface of described cylindrical metal conductor 7 other end is connected with energy management circuit, this energy management circuit For the energy absorbed is stored.

Fig. 3 is the return loss plot of the five jiaos of radio-frequency antennas of low-loss utilizing the simulation of HFSS antenna modeling simulation software, by Figure understand, the return loss of these five jiaos of radio-frequency antennas of low-loss is-36.8dB, than other same volume antenna return loss also Little, performance is the best.

Fig. 4 is the five jiaos of radio-frequency antennas of low-loss utilizing the simulation of HFSS antenna modeling simulation software gains in XZ plane Figure, as seen from the figure, five jiaos of radio-frequency antennas of this low-loss are 3.72dB in the maximum gain of 2.45GHz, and directivity is the most stable.

Embodiment above describes the ultimate principle of the present invention, principal character and advantage, the technical staff of the industry should Understanding, the present invention is not restricted to the described embodiments, and the simply explanation present invention's described in above-described embodiment and description 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. five jiaos of radio-frequency antennas of low-loss, it is characterised in that include consistent size and dielectric overlay bonded to each other from top to bottom Layer, medium substrate and earth plate, the medium substrate of side of wherein fitting with dielectric passivation is pasted with metal antenna paster, draws To device and reflector, the middle part of medium substrate is provided with the cylindrical metal conductor extending vertically through medium substrate, and earth plate is provided with The circular hole concentric with cylindrical metal conductor bottom surface；The material of described dielectric passivation is Rogers RO6002, DIELECTRIC CONSTANT ε_r =2.94, thickness d=0.51mm, length and width is 30mm；The radius of the circular coverage rate of described metal antenna paster is 0.0973 λ, wherein λ=122mm, λ is the wavelength of 2.45GHz radio frequency, and thickness is 0.02mm, and material is copper, described medium substrate Material be Rogers RO6010, DIELECTRIC CONSTANT ε_r=10.2, thickness d=2.54mm, length and width is 30mm, metal The central point of antenna patch is consistent with the center position of medium substrate upper surface；The design shape of described metal antenna paster and Size meets following requirement, sets up plane right-angle coordinate, by initial point (0mm ,-2.5mm) as starting point, (13.75mm ,- It is 2.5mm) 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, rotates 99 ° by line segment one, in the counterclockwise direction with curvilinear equationIntersection point be H (14.3366mm ,-6.20383mm), with straight line y=-x for axis of symmetry make minute surface symmetry obtain a L (6.20383mm ,- 14.3366mm), line segment one is made minute surface symmetry with straight line y=-x for axis of symmetry and obtain line segment two, line segment one and the friendship of line segment two Point isDifference junction point H (14.3366mm ,-6.20383mm),With L (6.20383mm ,-14.3366mm),Obtain line segment HW and line segment LW, again by initial point (0mm, 0mm) As starting point, make the line segment of an a length of 2.5mm along x-axis positive direction, with the circle that (2.5mm ,-1.25mm) is first curve The heart, with (2.5mm, 0mm) for end point, is another end points with (3.75mm ,-1.25mm), radius r₁=1.25mm, makes circumference Angle is 90 °, and direction is the circular arc protruded to x-axis and y-axis positive direction, with the center of circle that (5mm ,-1.25mm) is second curve, with (3.75mm ,-1.25mm) is end point, is another end points with (6.25mm ,-1.25mm), radius r₂=1.25mm, makes circumference Angle is 180 °, and direction is the circular arc protruded to y-axis negative direction, then with the center of circle that (7.5mm ,-1.25mm) is the 3rd curve, With (6.25mm ,-1.25mm) for end point, it is another end points with (7.5mm, 0mm), radius r₃=1.25mm, makes angle of circumference Being 90 °, direction is the circular arc protruded to x-axis negative direction and y-axis positive direction, with the circle that (7.5mm ,-2.5mm) is the 4th curve The heart, with (7.5mm, 0mm) for end point, is another end points with (10mm ,-2.5mm), radius r₄=2.5mm, making angle of circumference is 90 °, direction is the circular arc protruded to x-axis and y-axis positive direction；With the center of circle that (13.75mm ,-2.5mm) is the 5th curve, with (10mm ,-2.5mm) is end point, is another end points with H (14.3366mm ,-6.20383mm), radius r₅=3.75mm, makes Angle of circumference is 99 °, and direction is the circular arc protruded to x-axis and y-axis negative direction, obtains initial graphics one, with straight line y=-x as symmetry Axle, carries out initial graphics one minute surface symmetry, obtains initial graphics two, line segment HW, line segment LW, initial graphics one and initial graphics Two merging obtain rotating graphs one, by rotating graphs one with pointFor The point of rotation, rotates 72 °, 144 °, 216 ° and 288 ° the most successively, respectively obtains rotating graphs two, rotating graphs three, rotation figure Shape four and rotating graphs five, rotating graphs one, rotating graphs two, rotating graphs three, rotating graphs four and rotating graphs five merge, Obtain closed figure, be that original 0.7481 times obtains required metal antenna patch by the circular coverage rate reduced radius of closed figure The design shape of sheet and size, obtain metal antenna paster according to design shape and size cutting；Described director is rectangle gold Belonging to bar one, the length and width of this rectangular metal bar one is respectively 10mm and 0.47mm, its long limit and the upper and lower sides of medium substrate Limit is parallel, and minor face is parallel with the left and right side of medium substrate, and central point is respectively with the vertical dimension of the upper and lower side of medium substrate 28.5mm and 1.5mm, central point is respectively 15mm and 15mm with the vertical dimension of medium substrate left and right side, and described reflector is Rectangular metal bar two, the length and width of this rectangular metal bar two is respectively 18mm and 0.46mm, its long limit and medium substrate Side is parallel up and down, and minor face is parallel with the left and right side of medium substrate, central point and the vertical dimension of the upper and lower side of medium substrate Being respectively 1.4mm and 28.6mm, central point is respectively 15mm and 15mm with the vertical dimension of medium substrate left and right side；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 center of circle, junction of 0.5mm, thickness d=2.54mm, cylindrical metal conductor and metal antenna paster and four sides of medium substrate The vertical dimension on limit is respectively 16.59mm, 16.59mm, 13.41mm and 13.41mm, 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 for storing the energy absorbed.