CN106299654A - High-gain radio-frequency (RF) energy collects antenna - Google Patents

Abstract

The invention discloses a kind of high-gain radio-frequency (RF) energy and collect antenna, 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 with on the medium substrate of dielectric passivation laminating side, the middle part of medium substrate is provided with and extends vertically through the cylindrical metal conductor of medium substrate and four cylindrical cavities, 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

High-gain radio-frequency (RF) energy collects antenna

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 High-gain radio-frequency (RF) energy collect antenna.

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, flow of the people；Thering is provided power supply by wiring for these sensor nodes, its cost is ten Point expensive, and use battery main problems faced of powering is the most how to judge that the battery of which node has exhausted and carried out Changing, this is commercially difficult to accept, and using ambient radio-frequency energy collection technique to be aided with rechargeable battery is then that it compares Preferably 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 high-gain radio-frequency (RF) energy reasonable in design receipts Collection antenna, this antenna is compared with the less size having for other antenna, the loss of relatively low clawback, good impedance matching Higher gain.

The present invention solves that above-mentioned technical problem adopts the following technical scheme that, high-gain radio-frequency (RF) energy collects antenna, and it is special Levy and be to include consistent size and dielectric passivation bonded to each other, medium substrate and earth plate from top to bottom, wherein with medium Being pasted with metal antenna paster on the medium substrate of cover layer laminating side, the middle part of medium substrate is provided with and extends vertically through medium base The cylindrical metal conductor of plate and four cylindrical cavities, earth plate is provided with the circle concentric with cylindrical metal conductor bottom surface Hole；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 0.1082 λ, wherein λ=122mm, and λ is 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, is situated between Electric constant ε_r=10.2, thickness d=2.54mm, length and width is 30mm, the central point of metal antenna paster and medium base The center position of plate upper surface is consistent；The design shape of described metal antenna paster and size meet following requirement, set up flat Face rectangular coordinate system, by initial point (0mm ,-2.5mm) as starting point, (13.75mm ,-2.5mm) is that another end points is along x-axis positive direction Make the line segment one of an a length of 13.75mm, with point (13.75mm ,-2.5mm) for the point of rotation, by line segment one in the counterclockwise direction Rotate 117 °, with curvilinear equationIntersection point be H (15.45246mm ,-5.84127mm), with Straight line y=-x is that axis of symmetry is made minute surface symmetry and obtained a L (5.84127mm ,-15.45246mm), then along line segment 1 and x-axis angle It is the direction of 63 °, in coordinate axes the 4th interval, extends to original 2 times, be extended line segment two, be right with straight line y=-x Claiming axle to make minute surface symmetry and be extended line segment three, the intersection point extending line segment two and prolongation line segment three isDifference junction point H (15.45246mm ,-5.84127mm),With L (5.84127mm ,-15.45246mm),Obtain line segment HW and line segment LW, again initial point (0mm, 0mm) is made For starting point, make the line segment of an a length of 2.5mm along x-axis positive direction, with the center of circle that (2.5mm ,-1.25mm) is first curve, With (2.5mm, 0mm) for end point, it is another end points with (3.75mm ,-1.25mm), radius r₁=1.25mm, 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 (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 angle of circumference Being 180 °, 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) is end point, is another end points with (7.5mm, 0mm), radius r₃=1.25mm, making angle of circumference is 90 °, Direction is the circular arc protruded to x-axis negative direction and y-axis positive direction, with the center of circle that (7.5mm ,-2.5mm) is the 4th curve, with (7.5mm, 0mm) is end point, is another end points with (10mm ,-2.5mm), radius r₄=2.5mm, making angle of circumference is 90 °, direction For 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) it is end point, is another end points with H (15.45246mm ,-5.84127mm), radius r₅=3.75mm, making angle of circumference is 117 °, direction is the circular arc protruded to x-axis and y-axis negative direction, obtains initial graphics one, with straight line y=-x as axis of symmetry, and will just It is symmetrical that beginning figure one carries out minute surface, obtains initial graphics two, line segment HW, line segment LW, initial graphics one and initial graphics two is closed And, obtain rotating graphs one, by rotating graphs one with pointFor rotating Point, rotates 36 °, 72 °, 108 °, 144 °, 180 °, 216 °, 252 °, 288 ° and 324 ° the most successively, respectively obtains rotating graphs Two, rotating graphs three, rotating graphs four, rotating graphs five, rotating graphs six, rotating graphs seven, rotating graphs eight, rotating graphs Nine and rotating graphs ten, rotating graphs one, rotating graphs two, rotating graphs three, rotating graphs four, rotating graphs five, rotate figure Shape six, rotating graphs seven, rotating graphs eight, rotating graphs nine and rotating graphs ten merge, and obtain closed figure, by closed figure Circular coverage rate reduced radius be design shape and the size that original 0.3666 times obtains required metal antenna paster, according to Design shape and size cutting obtain metal antenna paster；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；On described medium substrate, the radius of four cylindrical cavities is 0.5mm, four cylindrical cavities It is the square of 22mm that circle center line connecting constitutes the length of side, the following and vertical dimension difference of the upper and lower side of medium substrate on this square For 2.9mm and 5.1mm, square left and right side is respectively 2mm and 6mm, with circle with the vertical dimension of the medium substrate left and right sides The aperture R=1.9mm of circular hole on the earth plate that cylindricality metallic conductor is relative, the output of the described cylindrical metal conductor other end connects Mouth is connected with energy management circuit, and this energy management circuit is for storing the energy absorbed.

The technique effect of the present invention is: high-gain radio-frequency (RF) energy is collected antenna and had lower return loss, good resistance Anti-coupling and standing-wave ratio 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 that high-gain radio-frequency (RF) energy collects antenna structure view；

Fig. 3 is the return loss utilizing the high-gain radio-frequency (RF) energy of HFSS antenna modeling simulation software simulation to collect antenna Figure；

Fig. 4 is to utilize the high-gain radio-frequency (RF) energy of HFSS antenna modeling simulation software simulation to collect antenna in XZ plane Gain diagram.

In figure: 1, dielectric passivation, 2, medium substrate, 3, earth plate, 4, metal antenna paster, 5, cylindrical metal leads Body, 6, cylindrical cavity, 7, 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 that high-gain radio-frequency (RF) energy collects Antenna Design, needs height when microstrip antenna designs The size of the metal antenna paster of gain RF collection of energy antenna, the size of medium substrate, thickness carries out theoretic estimation, The high-gain radio-frequency (RF) energy of applicable characteristic frequency more quickly could be found simulation experiment when accurately to collect antenna.Institute By following as a example by rectangular 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, high-gain radio-frequency (RF) energy collects antenna, including consistent size from top to bottom and Jie bonded to each other Matter cover layer 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 patch 4, the middle part of medium substrate 2 is provided with and extends vertically through the cylindrical metal conductor 5 of medium substrate 2 and four cylindrical holes 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, DIELECTRIC CONSTANT 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 0.1082 λ, wherein λ=122mm, and λ is 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, DIELECTRIC CONSTANT ε_r=10.2, thickness d= 2.54mm, length and width is the center position one of 30mm, the central point of metal antenna paster 4 and medium substrate upper surface Cause；Design shape and the size of described metal antenna paster 4 meet following requirement, set up plane right-angle coordinate, by initial point (0mm ,-2.5mm), as starting point, (13.75mm ,-2.5mm) is that another end points makes an a length of 13.75mm along x-axis positive direction Line segment one, with point (13.75mm ,-2.5mm) for the point of rotation, line segment one is rotated 117 ° in the counterclockwise direction, with curvilinear equationIntersection point be H (15.45246mm ,-5.84127mm), with straight line y=-x for axis of symmetry make Minute surface symmetry obtains a L (5.84127mm ,-15.45246mm), then along the direction that line segment 1 and x-axis angle are 63 °, at coordinate axes Extend to original 2 times in 4th interval, be extended line segment two, make minute surface symmetry with straight line y=-x for axis of symmetry and prolonged Long line segment three, the intersection point extending line segment two and prolongation line segment three is Difference junction point H (15.45246mm ,-5.84127mm),And L (5.84127mm ,-15.45246mm),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 (15.45246mm ,- 5.84127mm) it is another end points, radius r₅=3.75mm, making angle of circumference is 117 °, 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, merges line segment HW, line segment LW, initial graphics one and initial graphics two, obtains rotating graphs one, by rotating graphs one With pointFor the point of rotation, rotate the most successively 36 °, 72 °, 108 °, 144 °, 180 °, 216 °, 252 °, 288 ° and 324 °, respectively obtain rotating graphs two, rotating graphs three, rotating graphs four, rotate Figure five, rotating graphs six, rotating graphs seven, rotating graphs eight, rotating graphs nine and rotating graphs ten, rotating graphs one, rotation Turn figure two, rotating graphs three, rotating graphs four, rotating graphs five, rotating graphs six, rotating graphs seven, rotating graphs eight, rotation Turn figure nine and rotating graphs ten merging, obtain closed figure, be original by the circular coverage rate reduced radius of closed figure 0.3666 times of design shape obtaining required metal antenna paster 4 and size, obtain metal according to design shape and size cutting Antenna patch 4；One end of described cylindrical metal conductor 5 is connected with metal antenna paster 4, the material of cylindrical metal conductor 5 For copper, its bottom surface radius r=0.5mm, thickness d=2.54mm, cylindrical metal conductor 5 and the junction of metal antenna paster 4 The center of circle is respectively 16.59mm, 16.59mm, 13.41mm and 13.41mm with the vertical dimension of 2 four sides of medium substrate；Described On medium substrate 2, the radius of four cylindrical cavities 6 is 0.5mm, and the circle center line connecting of four cylindrical cavities 6 constitutes the length of side and is The square of 22mm, on this square, following and medium substrate about 2 side vertical dimension is respectively 2.9mm and 5.1mm, just Square left and right side is respectively 2mm and 6mm with the vertical dimension of medium substrate 2 left and right sides, relative with cylindrical metal conductor 5 Earth plate 3 on the aperture R=1.9mm of circular hole 7, the output interface of described cylindrical metal conductor 5 other end and energy management Circuit is connected, and this energy management circuit is for storing the energy absorbed.

Fig. 3 is the return loss utilizing the high-gain radio-frequency (RF) energy of HFSS antenna modeling simulation software simulation to collect antenna Figure, as seen from the figure, it is-38dB that this high-gain radio-frequency (RF) energy collects the return loss of antenna, returning than other same volume antenna Ripple loss is also little, and performance is the best.

Fig. 4 is to utilize the high-gain radio-frequency (RF) energy of HFSS antenna modeling simulation software simulation to collect antenna in XZ plane Gain diagram, as seen from the figure, it is 3.82dB in the maximum gain of 2.45GHz that this high-gain radio-frequency (RF) energy collects antenna, and directivity is non- 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. high-gain radio-frequency (RF) energy collects antenna, it is characterised in that include that consistent size and medium bonded to each other cover from top to bottom Cap rock, medium substrate and earth plate, be wherein pasted with metal antenna paster with on the medium substrate of dielectric passivation laminating side, The middle part of medium substrate is provided with and extends vertically through the cylindrical metal conductor of medium substrate and four cylindrical cavities, and earth plate sets There is 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 Being 0.1082 λ, wherein λ=122mm, λ is the wavelength of 2.45GHz radio frequency, and thickness is 0.02mm, and material is copper, described medium base The material of plate is Rogers RO6010, DIELECTRIC CONSTANT ε_r=10.2, thickness d=2.54mm, length and width is 30mm, gold The central point belonging to 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, set 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 117 ° by line segment one, in the counterclockwise direction with curvilinear equationIntersection point be H (15.45246mm ,-5.84127mm), with straight line y=-x for axis of symmetry make minute surface symmetry obtain a L (5.84127mm ,- 15.45246mm), then along the direction that line segment 1 and x-axis angle are 63 °, in coordinate axes the 4th interval, extend to original 2 times, It is extended line segment two, makees minute surface symmetry with straight line y=-x for axis of symmetry and be extended line segment three, extend line segment two and extended line The intersection point of section three isDifference junction point H (15.45246mm ,- 5.84127mm)、With L (5.84127mm ,-15.45246mm),Obtain line segment HW and line segment LW, again by initial point (0mm, 0mm) conduct Starting point, makes the line segment of an a length of 2.5mm along x-axis positive direction, with the center of circle that (2.5mm ,-1.25mm) is first curve, With (2.5mm, 0mm) for end point, it is another end points with (3.75mm ,-1.25mm), radius r₁=1.25mm, makes angle of circumference Being 90 °, 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 (15.45246mm ,-5.84127mm), radius r₅=3.75mm, makees Going out angle of circumference is 117 °, and direction is the circular arc protruded to x-axis and y-axis negative direction, obtains initial graphics one, with straight line y=-x is Axis of symmetry, it is symmetrical that initial graphics one carries out minute surface, obtains initial graphics two, by line segment HW, line segment LW, initial graphics one and just Beginning figure two merges, and obtains rotating graphs one, by rotating graphs one with point For the point of rotation, rotate 36 °, 72 °, 108 °, 144 °, 180 °, 216 °, 252 °, 288 ° and 324 ° the most successively, respectively obtain rotation Turn figure two, rotating graphs three, rotating graphs four, rotating graphs five, rotating graphs six, rotating graphs seven, rotating graphs eight, rotation Turn figure nine and rotating graphs ten, rotating graphs one, rotating graphs two, rotating graphs three, rotating graphs four, rotating graphs five, Rotating graphs six, rotating graphs seven, rotating graphs eight, rotating graphs nine and rotating graphs ten merge, and obtain closed figure, will envelope The circular coverage rate reduced radius closing figure is design shape and the chi that original 0.3666 times obtains required metal antenna paster Very little, obtain metal antenna paster according to design shape and size cutting；One end of described cylindrical metal conductor and metal antenna Paster connects, and the material of cylindrical metal conductor is copper, its bottom surface radius r=0.5mm, thickness d=2.54mm, cylindrical metal The center of circle, junction of conductor and metal antenna paster and the vertical dimension of four sides of medium substrate be respectively 16.59mm, 16.59mm, 13.41mm and 13.41mm；On described medium substrate, the radius of four cylindrical cavities is 0.5mm, four cylinders It is the square of 22mm that the circle center line connecting of shape hole constitutes the length of side, and on this square, following side upper and lower with medium substrate is vertical Distance respectively 2.9mm and 5.1mm, the vertical dimension of square left and right side and the medium substrate left and right sides be respectively 2mm and 6mm, the aperture R=1.9mm of circular hole on the earth plate relative with cylindrical metal conductor, the described cylindrical metal conductor other end Output interface be connected with energy management circuit, this energy management circuit is for storing the energy absorbed.