CN106252867A - Radio frequency efficient absorption antenna - Google Patents

Abstract

The invention discloses a kind of radio frequency efficient absorption 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 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

Radio frequency efficient absorption 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 Radio frequency efficient absorption antenna.

Background technology

At home, start late about the transmission technology research in the radio-frequency wireless energy confined space, rapidly send out in science and technology Today of exhibition, along with economic progress and the raising of 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.

Summary of the invention

Present invention solves the technical problem that and there is provided a kind of simple in construction and radio frequency efficient absorption antenna reasonable in design, This antenna is compared with the less size having for other antenna, the loss of relatively low clawback, good impedance matching and higher Gain.

The present invention solves that above-mentioned technical problem adopts the following technical scheme that, radio frequency efficient absorption antenna, it is characterised in that Including consistent size from top to bottom and dielectric passivation bonded to each other, medium substrate and earth plate, wherein with dielectric passivation Being pasted with metal antenna paster on the medium substrate of laminating side, the middle part of medium substrate is provided with the circle extending vertically through medium substrate Cylindricality metallic conductor, earth plate is provided with the circular hole concentric with cylindrical metal conductor bottom surface；The material of described dielectric passivation For Rogers RO6002, DIELECTRIC CONSTANT ε_r=2.94, thickness d=0.51mm, length and width is 30mm；Described metal sky The radius of the circular coverage rate of line paster is 0.10787 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 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 and medium substrate upper surface Cause；Design shape and the size of described metal antenna paster meet following requirement, set up plane right-angle coordinate, by initial point (0mm, 0mm), as starting point, makes the line segment one of an a length of 18mm along x-axis positive direction, by line segment one with point (18mm, 0mm) Rotate 120 ° as the point of rotation counterclockwise and obtain line segment two, by line segment two with straight lineMinute surface is made symmetrical for axis of symmetry Obtaining line segment three, the intersection point of line segment two and line segment three isThis point is at straight lineOn, again By initial point (0mm, 0mm) as starting point, carry out antenna patch shape design according to below equation:

Y=0 (0≤x≤2.5) (1)

$\begin{array}{ccc}y=\sqrt{-x^2+5x-4.6875}-1.25& (-1.25\≤y\≤0)& (2.5\≤x\≤3.75)\end{array}---\left(2\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+8.125x-16.40625}-1.25& (-1.5625\≤y\≤-1.25)& (3.75\≤x\≤4.375)\end{array}---\left(3\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+9.375x-21.875}-1.25& (-1.25\≤y\≤-0.9375)& (4.375\≤x\≤5)\end{array}---\left(4\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+11.25x-31.25}-1.25& (-1.875\≤y\≤-1.25)& (5\≤x\≤6.25)\end{array}---\left(5\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+15x-54.6875}-1.25& (-1.25\≤y\≤0)& (6.25\≤x\≤7.5)\end{array}---\left(6\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+15x-50}-2.5& (-2.5\≤y\≤0)& (7.5\≤x\≤10)\end{array}---\left(7\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+23.75x-137.5}-2.5& (-5\≤y\≤-2.5)& (10\≤x\≤13.75)\end{array}---\left(8\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+32.5x-257.8125}-2.5& (-2.5\≤y\≤0)& (13.75\≤x\≤16.25)\end{array}---\left(9\right)$

Y=0 (16.25≤x≤18) (10)

To be joined end to end successively by the whole curves obtained by formula, in x-axis and y-axis plane, obtain initial graphics one, By initial graphics one with straight lineMake minute surface symmetry for axis of symmetry and obtain initial graphics two, initial graphics one, initial graph Shape two, line segment two and line segment three merging obtain rotating graphs one, by rotating graphs one with pointFor rotating Point, rotates 60 °, 120 °, 180 °, 240 ° and 300 ° the most successively, respectively obtains rotating graphs two, rotating graphs three, rotates 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, by the reduced radius of the circular coverage rate of closed figure to original 0.44135 times of design shape obtaining required metal antenna paster and size, obtain metal according to design shape and size cutting Antenna patch；One end of described cylindrical metal conductor is connected with metal antenna paster, and the material of cylindrical metal conductor is copper, The center of circle, junction of its bottom surface radius r=0.5mm, thickness d=2.54mm, cylindrical metal conductor and metal antenna paster and Jie The vertical dimension of four sides of matter substrate is respectively 16.62mm, 16.62mm, 13.38mm and 13.38mm, leads with cylindrical metal The aperture R=1.9mm of circular hole on the earth plate that body is relative, the output interface of the described cylindrical metal conductor other end and energy pipe Reason circuit is connected, and this energy management circuit is for storing the energy absorbed.

The technique effect of the present invention is: radio frequency efficient absorption antenna has lower return loss, good impedance matching With 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 radio frequency efficient absorption antenna structure view；

Fig. 3 is the return loss plot of the radio frequency efficient absorption antenna utilizing the simulation of HFSS antenna modeling simulation software；

Fig. 4 is the input impedance figure of the radio frequency efficient absorption antenna 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, cylindrical metal leads Body, 6, 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 radio frequency efficient absorption Antenna Design, needs radio frequency efficient when microstrip antenna designs Absorbing the size of the metal antenna paster of antenna, the size of medium substrate, thickness carry out theoretic estimation, could be real in simulation The radio frequency efficient absorption antenna of applicable characteristic frequency is more quickly found accurately the when of testing.So below with rectangular microstrip sky As a example by line, 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 △ 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, radio frequency efficient absorption antenna, including consistent size from top to bottom and dielectric overlay bonded to each other 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 Sheet 4, the middle part of medium substrate 2 is provided with the cylindrical metal conductor 5 extending vertically through medium substrate 2, and earth plate 3 is provided with and cylinder The circular hole 6 that shape metallic conductor 5 bottom surface is concentric；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；The radius of the circular coverage rate of described metal antenna paster 4 is 0.10787 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 The material of 2 is Rogers RO6010, DIELECTRIC CONSTANT ε_r=10.2, thickness d=2.54mm, length and width is 30mm, metal The central point of antenna patch 4 is consistent with the center position of medium substrate 2 upper surface；The design shape of described metal antenna paster 4 Shape and size meet following requirement, set up plane right-angle coordinate, by initial point (0mm, 0mm) as starting point, make along x-axis positive direction Go out the line segment one of an a length of 18mm, line segment one is rotated 120 ° with point (18mm, 0mm) counterclockwise as the point of rotation and obtains line segment Two, by line segment two with straight lineMaking minute surface symmetry for axis of symmetry and obtain line segment three, the intersection point of line segment two and line segment three isThis point is at straight lineOn, again by initial point (0mm, 0mm) as starting point, according to following public affairs Formula carries out antenna patch shape design:

Y=0 (0≤x≤2.5) (1)

$\begin{array}{ccc}y=\sqrt{-x^2+5x-4.6875}-1.25& (-1.25\≤y\≤0)& (2.5\≤x\≤3.75)\end{array}---\left(2\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+8.125x-16.40625}-1.25& (-1.5625\≤y\≤-1.25)& (3.75\≤x\≤4.375)\end{array}---\left(3\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+9.375x-21.875}-1.25& (-1.25\≤y\≤-0.9375)& (4.375\≤x\≤5)\end{array}---\left(4\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+11.25x-31.25}-1.25& (-1.875\≤y\≤-1.25)& (5\≤x\≤6.25)\end{array}---\left(5\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+15x-54.6875}-1.25& (-1.25\≤y\≤0)& (6.25\≤x\≤7.5)\end{array}---\left(6\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+15x-50}-2.5& (-2.5\≤y\≤0)& (7.5\≤x\≤10)\end{array}---\left(7\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+23.75x-137.5}-2.5& (-5\≤y\≤-2.5)& (10\≤x\≤13.75)\end{array}---\left(8\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+32.5x-257.8125}-2.5& (-2.5\≤y\≤0)& (13.75\≤x\≤16.25)\end{array}---\left(9\right)$

Y=0 (16.25≤x≤18) (10)

To be joined end to end successively by the whole curves obtained by formula, in x-axis and y-axis plane, obtain initial graphics one, By initial graphics one with straight lineMake minute surface symmetry for axis of symmetry and obtain initial graphics two, initial graphics one, initial graph Shape two, line segment two and line segment three merging obtain rotating graphs one, by rotating graphs one with pointFor rotating Point, rotates 60 °, 120 °, 180 °, 240 ° and 300 ° the most successively, respectively obtains rotating graphs two, rotating graphs three, rotates 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, by the reduced radius of the circular coverage rate of closed figure to original 0.44135 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 16.62mm, 16.62mm, 13.38mm and 13.38mm, with circle with the vertical dimension of 2 four sides of medium substrate The aperture R=1.9mm of circular hole 6 on the earth plate 3 that cylindricality metallic conductor 5 is relative, described cylindrical metal conductor 5 other end defeated Outgoing interface is connected with energy management circuit, and this energy management circuit is for storing the energy absorbed.

Fig. 3 is the return loss plot of the radio frequency efficient absorption antenna utilizing the simulation of HFSS antenna modeling simulation software, by scheming Understanding, the return loss of this radio frequency efficient absorption antenna is-26.64dB, also wants than the return loss of other same volume antenna Little, performance is the best.

Fig. 4 is the input impedance figure of the radio frequency efficient absorption antenna utilizing the simulation of HFSS antenna modeling simulation software, by scheming Understanding, this radio frequency efficient absorption antenna is 54.7463 Ω at the input impedance of 2.45GHz, closely normal impedance 50 Ω.

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. radio frequency efficient absorption antenna, it is characterised in that include from top to bottom consistent size and dielectric passivation bonded to each other, Medium substrate and earth plate, be wherein pasted with metal antenna paster, medium with on the medium substrate of dielectric passivation laminating side The middle part of substrate is provided with the cylindrical metal conductor extending vertically through medium substrate, earth plate be provided with cylindrical metal conductor at the bottom of The circular hole that face is concentric；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 0.10787 λ, wherein λ =122mm, λ are the wavelength of 2.45GHz radio frequency, and 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 Consistent with the center position of medium substrate upper surface；The design shape of described metal antenna paster and size meet to be wanted as follows Ask, set up plane right-angle coordinate, by initial point (0mm, 0mm) as starting point, make the line of an a length of 18mm along x-axis positive direction Duan Yi, counterclockwise rotates 120 ° with point (18mm, 0mm) as the point of rotation by line segment one and obtains line segment two, by line segment two with straight lineMaking minute surface symmetry for axis of symmetry and obtain line segment three, the intersection point of line segment two and line segment three is This point is at straight lineOn, again by initial point (0mm, 0mm) as starting point, carry out antenna patch shape according to below equation Shape designs:

Y=0 (0≤x≤2.5) (1)

$\begin{array}{ccc}y=\sqrt{-x^2+5x-4.6875}-1.25& (-1.25\≤y\≤0)& (2.5\≤x\≤3.75)\end{array}---\left(2\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+8.125x-16.40625}-1.25& (-1.5625\≤y\≤-1.25)& (3.75\≤x\≤4.375)\end{array}---\left(3\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+9.375x-21.875}-1.25& (-1.25\≤y\≤-0.9375)& (4.375\≤x\≤5)\end{array}---\left(4\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+11.25x-31.25}-1.25& (-1.875\≤y\≤-1.25)& (5\≤x\≤6.25)\end{array}---\left(5\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+15x-54.6875}-1.25& (-1.25\≤y\≤0)& (6.25\≤x\≤7.5)\end{array}---\left(6\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+15x-50}-2.5& (-2.5\≤y\≤0)& (7.5\≤x\≤10)\end{array}---\left(7\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+23.75x-137.5}-2.5& (-5\≤y\≤-2.5)& (10\≤x\≤13.75)\end{array}---\left(8\right)$

$\begin{array}{ccc}y=\sqrt{-x^2+32.5x-257.8125}-2.5& (-2.5\≤y\≤0)& (13.75\≤x\≤16.25)\end{array}---\left(9\right)$

Y=0 (16.25≤x≤18) (10)

To be joined end to end successively by the whole curves obtained by formula, in x-axis and y-axis plane, obtain initial graphics one, will just Beginning figure one is with straight lineMake minute surface symmetry for axis of symmetry and obtain initial graphics two, initial graphics one, initial graphics Two, line segment two and line segment three merging obtain rotating graphs one, by rotating graphs one with pointFor rotating Point, rotates 60 °, 120 °, 180 °, 240 ° and 300 ° the most successively, respectively obtains rotating graphs two, rotating graphs three, rotates 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, by the reduced radius of the circular coverage rate of closed figure to original 0.44135 times of design shape obtaining required metal antenna paster and size, obtain metal according to design shape and size cutting Antenna patch；One end of described cylindrical metal conductor is connected with metal antenna paster, and the material of cylindrical metal conductor is copper, The center of circle, junction of its bottom surface radius r=0.5mm, thickness d=2.54mm, cylindrical metal conductor and metal antenna paster and Jie The vertical dimension of four sides of matter substrate is respectively 16.62mm, 16.62mm, 13.38mm and 13.38mm, leads with cylindrical metal The aperture R=1.9mm of circular hole on the earth plate that body is relative, the output interface of the described cylindrical metal conductor other end and energy pipe Reason circuit is connected, and this energy management circuit is for storing the energy absorbed.