CN207611868U - A kind of conical beam wide-band slot antenna array and wear VR equipment - Google Patents
A kind of conical beam wide-band slot antenna array and wear VR equipment Download PDFInfo
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- CN207611868U CN207611868U CN201721819311.6U CN201721819311U CN207611868U CN 207611868 U CN207611868 U CN 207611868U CN 201721819311 U CN201721819311 U CN 201721819311U CN 207611868 U CN207611868 U CN 207611868U
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Abstract
The utility model discloses a kind of conical beam wide-band slot antenna array and wear VR equipment, aerial array includes gap radiation array, four T-type couple feed lines, AMC reflectings surface, power splitters etc., and antenna broadband coverage effect is realized in such a way that gap radiation body is combined using monopole；Using the slot antenna array of 2 × 2 symmetrical group battle array modes, and constant amplitude etc. is carried out to the different location of gap radiating element using one point of four power splitter and is mutually fed, form the conical beam of similar monopole, omnidirectional's covering is obtained in horizontal plane；Using artificial magnetic conductor AMC reflectings surface, make full use of same phase reflection superposition of the back lobe radiation on AMC reflectings surface, in the case where antenna height is not significantly increased, increase the gain of aerial array reduces the SAR value of the number of people simultaneously, so that antenna obtains better robustness on headform, the wireless penetration for being suitable for wear-type VR equipment communicates；Conical beam antenna with horizontal omnidirectional coverage property is arranged in the VR helmets to improve communication quality.
Description
Technical field
The utility model is related to the antenna research field in wireless mobile communications field, more particularly to a kind of conical beam broadband
Slot antenna array and wear VR equipment.
Background technology
With body area network research deeply and Information technology development, with virtual reality (Virtual Reality,
VR) equipment is that the wireless body area network of representative applies the daily entertainment to people to bring complete new experience.VR at this stage is set
It is standby based on wear-type, and most products are by way of wired connection and external host is communicated.It is this to have
The equipment connection mode of line is unfavorable for the experience that people use VR equipment, is immersed in VR environment when people are worn by VR equipment
When be frequently necessary to walk about, turns due, cable is possible to hinder the activity of people, and the cable wound is possible to that joy can be tripped
People in pleasure.It is experienced for the immersion of General Promotion people, the wireless penetration of wear-type VR equipment becomes one and important becomes
Gesture.In practical VR amusements, people often rotate body, and with limb action, this requires antenna to need in the horizontal plane
It to be covered all around with the ability of omnidirectional radiation with meeting.
The best set-point of wear-type VR antennas is to avoid the barrier effect of human body as possible at the top of the number of people, this requires day
Linear dimension cannot be too big.In addition, VR transmission high-definition signals need big bandwidth, in order to cover bandwidth as much as possible, it is applied to VR
The human body antenna of equipment must carry out broadband design, while the frequency that this can also successfully manage human body load and limb action is brought
Inclined mismatch effect.
The antenna of wireless VR equipment mostly uses monopole subscheme at this stage, in order to obtain omnidirectional's covering in horizontal plane, then
Monopole must be placed vertically number of people top surface, and section caused in this way is higher.In order to reduce section height, existing research pair
Monopole antenna carry out bending fold or it is conformal keep flat design, may make that antenna couples enhancing with head, reduction radiativity
Energy.Paster antenna possesses very low section, and floor can be isolated to being provided between antenna and human body.Introduce grounding probe it
Afterwards, the higher modes of paster antenna can also generate the pattern of omnidirectional's covering.The but this paster antenna based on higher modes
Bandwidth-Constrained, it is difficult to realize broadband design.In order to solve bandwidth problem, there is conical monopole of the researcher by top-loaded
Son is introduced into the design of helmet antenna, however its floor area is relatively large, is unfavorable for the miniaturization of VR equipment.
Due to being operated in human body surface, the design of human body antenna must consider spy of the human body to aerial radiation electromagnetic wave energy
Determine absorptivity, ensures electromagnetic radiation safety, this also proposes strict requirements to the design of human body antenna.
Utility model content
The shortcomings that the main purpose of the utility model is to overcome the prior arts and deficiency, provide a kind of conical beam broadband
Slot antenna array, the aerial array have broadband performance, and stable work in work has high-gain and high radiation efficiency.
The another object of the utility model is to provide a kind of head using above-mentioned conical beam wide-band slot antenna array
VR equipment is worn, aerial array is arranged at the top for wearing VR equipment.Broadband coverage effect may be implemented in the equipment.
The purpose of this utility model is realized by the following technical solution：A kind of conical beam wide-band slot antenna array,
Including gap radiation array and four T-type couple feed lines, it is etched in the lower surface and upper surface of first medium substrate respectively, together
Axis cable is array-fed to gap radiation；Gap radiation array is using slot antenna as array element, using 2 × 2 symmetrical group battle arrays
Mode enables the T-type couple feed line of centrosymmetric one group of slot element put in opposite directions, and uses one point of four power splitter pair four
T-type couple feed line carries out constant amplitude etc. and mutually feeds, and forms conical beam, and omnidirectional's covering is obtained in horizontal plane.
Preferably, the slot antenna array is divide into upper part and lower part, and upper part is first medium substrate and is etched in
Gap radiation array and four T-type couple feed lines, lower part above it are second substrate and the AMC being printed thereon
(Artificial Magnetic Conductors, artificial magnetic conductor) reflecting surface, first medium substrate, second substrate are equal
Row, coaxial cable pass through AMC reflectings surface array-fed to gap radiation.AMC reflectings surface and aerial array are combined, it is whole
It is adjusted and optimizes, the front and back ratio of radiation can be improved, reduce the coupling between human body head, reduce the SAR value of the number of people,
So that antenna can obtain better robustness in number of people environment.
Further, the AMC reflectings surface are formed using 6 × 6 square patch units.
Preferably, coaxial cable is array-fed to gap radiation, coaxial cable inner core and first medium upper surface of base plate 50
The distributing point of the main microstrip lines of Ω connects, and outer conductor is connect with lower surface, and two-way parallel connection characteristic impedance is connect behind the main microstrip lines of 50 Ω
The respectively microstrip line of 100 Ω is followed by quarter wavelength impedance transducer per the microstrip line of 100 Ω all the way, characteristic is hindered
Anti-rotation is changed to 50 Ω；Per the 100 Ω microstrip lines for connecing two-way parallel connection again all the way after impedance transformation, one-to-two is carried out, from
And the conical beam of similar monopole is formed, obtain omnidirectional's covering in horizontal plane.
Preferably, the first medium substrate uses Rogers 4360G2 medium substrates.
Preferably, the second substrate uses Rogers 4350B substrates.
Compared with prior art, the utility model has the advantages that：
1, the utility model slot antenna array symmetrically organizes battle array modes using slot antenna as array element using 2 × 2,
The T-type couple feed line of centrosymmetric one group of slot element is enabled to put in opposite directions, and using one point of four power splitter to slot element
Different location carry out constant amplitude etc. and mutually feed, form the conical beam of similar monopole, omnidirectional's covering obtained in horizontal plane,
In practical application, no matter how user moves, and antenna may have good coverage effect in horizontal plane.
2, slot antenna array is combined by the utility model with artificial magnetic conductor AMC reflectings surface, and is integrally adjusted
And optimization, same phase reflection superposition of the back lobe radiation on AMC reflectings surface is made full use of, the case where antenna height is not significantly increased
Under, increase gain and the radiation efficiency of aerial array, it is ensured that antenna can obtain better robustness in number of people environment.
3, the application of the utility model artificial magnetic conductor AMC reflectings surface, reduces SAR value of the number of people to electromagnetic wave energy,
It ensure that security of electromagnetic radiation of this aerial array to human body, contribute to push VR applied to the wireless module for wearing VR equipment
The universal development with VR technologies of equipment.
4, the utility model antenna can be applied to wireless mobile communications field, especially body area network and wirelessly communicate scene, can
Applied in the reception and transmitting equipment of all kinds of headset equipment wireless communication systems.Benefit from slot antenna list in aerial array
The use of member, may be implemented broadband coverage effect.
Description of the drawings
Fig. 1 a) be the utility model slot antenna array a specific embodiment；
Fig. 1 b) it is block mold figure when the utility model slot antenna array is applied in VR；
Fig. 2 is the hierarchical view of the utility model slot antenna array specific embodiment；
Fig. 3 a), b) be the utility model slot antenna array specific embodiment side view and vertical view；
Fig. 4 is the structure of four T-type couple feed lines in the utility model slot antenna array specific embodiment：A) on
Surface feed structure；B) lower surface radiating slot；
Fig. 5 is 6 × 6 unit AMC reflectings surface of the utility model slot antenna array specific embodiment；
Fig. 6 is the reflection system that the utility model slot antenna array specific embodiment is emulated and tested under various circumstances
Number；
Fig. 7 is the radiation direction of the utility model conical beam wide-band slot antenna array specific embodiment emulation and test
Figure：5.2GHz a) phi=0 °；B) phi=90 °；5.5GHz c) phi=0 °；D) phi=90 °；5.8GHz e) phi=0 °；
F) phi=90 °；
Fig. 8 a), b) be the utility model slot antenna array specific embodiment respectively in free space and headform's ring
5.5GHz antenna patterns in border；
Fig. 9 is the surface SAR distributions under different frequency in the utility model slot antenna array specific embodiment： a)
5.2GHz；b)5.5GHz；c)5.8GHz；
Figure 10 is the inside section SAR distributions under different frequency in the utility model slot antenna array specific embodiment：
a)5.2GHz；b)5.5GHz；c)5.8GHz；
Figure 11 is the gain curve of gap array emulation and test in the utility model slot antenna array specific embodiment；
Figure 12 is the radiation efficiency of gap array emulation and test in the utility model slot antenna array specific embodiment
Curve.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out clearly, in detail the technical detail of the utility model
Most explanation, described embodiment are only a part of the embodiment in the utility model, instead of all the embodiments.It is based on
The embodiments of the present invention, those of ordinary skill in the art obtained without making creative work other
Embodiment belongs to the scope of protection of the utility model.
A kind of conical beam wide-band slot antenna array described in the present embodiment, which can be applicable to, to be worn in VR equipment, refering to figure
1a), Fig. 1 b), VR device models are broadly divided into front shroud module and top module, and array is integrated in top module, as shown in Figure 2.
Refering to Fig. 2, Fig. 3 a), b), the slot antenna array structure of the present embodiment is broadly divided into two parts, and upper part is seam
Gap radiating curtain 8, lower part are artificial magnetic conductor AMC reflectings surface 10.Gap radiation array etching is in Rogers 4360G2 media
On substrate 5, and AMC reflectings surface 10 are then printed on Rogers 4350B substrates 11.Using nylon screw 4 upper part and under
Part spaced apart, 0.86 type coaxial cable 13 pass through AMC reflectings surface 10 to be fed to slot antenna array.
Refering to Fig. 4 a), b) weigh practical application scene space size and array gain, be unit with slot antenna 7,
In a manner of 2 × 2 symmetrical group battle arrays, the T-type couple feed line 2 of centrosymmetric one group of slot element is enabled to put in opposite directions；And use one
Divide four power splitters to carry out constant amplitude etc. to 2 × 2 aerial arrays mutually to feed, the feedback of coaxial feed inner core and the main microstrip lines of 50 Ω of upper surface
Electricity point connection, outer conductor are connect with lower surface.In order to match, two-way parallel connection characteristic impedance difference is connect behind the main microstrip lines of 50 Ω
For the microstrip line of 100 Ω.It is followed by quarter wavelength impedance transducer 3 per the microstrip line of 100 Ω all the way, characteristic impedance is turned
It is changed to 50 Ω.Per the 100 Ω microstrip lines for connecing two-way parallel connection again all the way after impedance transformation, one-to-two is carried out, to shape
At the conical beam of similar monopole, omnidirectional's covering is obtained in horizontal plane.
Refering to Fig. 5 the coupling between antenna and human body head, the present embodiment are reduced in order to improve the front and back ratio of radiation
Introduce AMC structures.In order to minimize antenna overall volume, using the composition AMC reflections of Unit 6 × 6 in the design
Face 10.
Refering to Fig. 6, the reflectance factor that antenna is emulated and tested under various circumstances is given.In free space, it emulates
It relatively coincide with test result, -10dB bandwidth covers 5-6GHz frequency ranges.The frequency range of free space emulation covering is 4.89-
6.19GHz realizes relative bandwidth 23.6%；The frequency range of free space actual measurement covering is 4.82-6.19GHz, and relative bandwidth is
24.8%.Two modes of resonance of slot antenna are taken full advantage of in the present embodiment, the result of global optimization makes gap circular die
Four T-type couple feed ray modes of formula and coupling obtain good matching, realize the broadband performance more than 20%.Work as gap
When array is operated in head VR equipment top modules, high-frequency resonant mode is moved down by the load of ABS resin material, still
Good impedance matching is maintained in passband.Since the good protection of AMC structures acts on, when VR product casings model is integrally worn
It wears when real head, reflectance factor is substantially consistent with the result that antenna only works inside 3D printing module, illustrates AMC structures
Reflection technology under various circumstances maintains stabilization, and the bandwidth of covering is also almost the same.When real head tests, gap
- the 10dB of aerial array covers 4.75-6.12GHz, realizes relative bandwidth 25.2%.The above test result demonstrates this seam
The design of gap aerial array has good robust performance in terms of bandwidth.
In the test of radiance, standard human head model is replaced using isotropic rectangular body Model.Cuboid people
The size of body Model is 120 × 120 × 50mm3.Refering to Fig. 7 a)-f) each antenna pattern, in 5-6 GHz working frequency range,
Occurs the zero of recess in z-axis, array antenna maintains good conical beam in broadband range, forms similar single
Extremely sub radiation mode, and realize omnidirectional radiation on theta=36 ° of horizontal plane.Simulation result in free space with
Test result is coincide, and for the front and back ratio of low-frequency range in 16dB or so, the front and back of high band then can be to 20dB or more.Manikin
On test result show that the backward lobe relative free space situation of two sections is reduced, this is primarily due to people
Body Model tissue resorption part back lobe radiation energy.
Refering to Fig. 8 a), b) illustrate 5.5GHz radiation direction of the array antenna respectively on free space and headform
Figure, it is seen that it still maintains the cone-shaped radiation beam of similar monopole, but due to the absorption of number of people tissue, it is whole to increase
Benefit drops to 5.84dBi by the 6.42dBi of free space.
Refering to Fig. 9 a), b), c), the number of people load in the environment of, Fig. 9 depict number of people top surface SAR distribution.From
As a result observation is it is found that the maximum distributed areas SAR concentrate on one band of bottom of gap array substantially.Section inside headform
SAR distributions are then such as Figure 10 a), b), c), it is shown.Frequency is higher, and Kelvin effect is stronger, and in 5-6GHz frequency ranges, energy is mainly dissipated in
The SAR value of human body surface, section is also mainly distributed on close to the place of human body surface, and electric field is deep into the depth of skin only
It is 10mm or so.Table 1 lists the maximum SAR value under different frequency.
Maximum SAR value under 1 different frequency of table
When input power is 500mW, the maximum SAR value under different frequency is respectively less than 0.22W/kg, this also froms the perspective of from side
Protective effect of the AMC reflectings surface to tissue is illustrated.Under the specified value of 1.6W/kg, maximum power that antenna can input
Up to 3.6W, this performance number has been much larger than the transmission power of general wireless terminal.
Refering to fig. 11, aerial array emulation and the gain curve tested are as shown in figure 11.In free space, simulated gain
6.0dBi or more is maintained essentially in the variation of frequency, is influenced by cable waste in actual test, fractionated gain declines
0.5dB.When array antenna is operated in the overhead of 3D printing, the loading effect of ABS resin materials can make gain phase
0.5dB is declined to the test result of free space.Since simulated tissue liquid is to the absorption of electromagnetic energy, it is integrated in outside ABS
When the gap array of shell is operated on manikin, the gain of acquisition has dropped about 0.2dB with respect to the previous case, but
Gain in required frequency range is still maintained at 5.0dBi or more.
2, Figure 12 gives the comparing result of antenna radiation efficiency refering to fig. 1.In the environment of no any load, this reality
In entire 5-6GHz frequency ranges it has been more than 90% with novel simulated radiation efficiency, due to the loss of cable and adapter,
Actual measurement radiation efficiency declines by a big margin in low-frequency range, but maintains essentially in 85% or so.VR equipment 3D printing shells are to spoke
The influence for penetrating efficiency is not notable, and test result is closer to free space measured result.When antenna is operated in simulation people
When body tissue, the loss effect of simulated tissue liquid is presented again so that radiation efficiency has dropped 3% or so.But, the drop of appearance
Width is simultaneously little, this benefits most from the coupling that AMC reflecting surfaces have largely been isolated between tissue and slot antenna
Cooperation is used, and is reduced tissue and is acted on the loss of electromagnetic radiation energy.
It is to the utility model conical beam wide-band slot antenna array and to wear the provided specific implementation of VR equipment above
The detailed description of example.The design, principle and embodiment of the utility model are illustrated with specific embodiment herein, helped
Assistant solves the content and its core concept of the utility model.It is only the preferred embodiments of the utility model in summary, not
To limit the utility model, within the spirit and principle of the utility model, made by any modification, equivalent replacement, change
Into etc., it should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of conical beam wide-band slot antenna array, which is characterized in that including gap radiation array and four T-type coupling feedbacks
Electric wire, is etched in the lower surface and upper surface of first medium substrate respectively, and coaxial cable is array-fed to gap radiation；Gap spoke
Array is penetrated using slot antenna as array element, using 2 × 2 symmetrical group battle array modes, enables the T of centrosymmetric one group of slot element
Type couple feed line is put in opposite directions, and is carried out constant amplitude etc. using one point of four power splitter pair, four T-type couple feed lines and mutually fed, shape
Tapered wave beam obtains omnidirectional's covering in horizontal plane.
2. conical beam wide-band slot antenna array according to claim 1, which is characterized in that the slot antenna array
It is divide into upper part and lower part, upper part is first medium substrate and is etched in the gap radiation array on its surface and four T-type couplings
Feed line is closed, lower part is second substrate and the AMC reflectings surface being printed thereon, and first medium substrate, second substrate are equal
Row, coaxial cable pass through AMC reflectings surface array-fed to gap radiation.
3. conical beam wide-band slot antenna array according to claim 2, which is characterized in that the AMC reflectings surface are adopted
It is formed with 6 × 6 square patch units.
4. conical beam wide-band slot antenna array according to claim 1 or 2, which is characterized in that coaxial cable is to seam
Gap radiating curtain is fed, and coaxial cable inner core connect with the distributing point of the main microstrip lines of 50 Ω of first medium upper surface of base plate, leads outside
Body is connect with lower surface, and the microstrip line that two-way parallel connection characteristic impedance is respectively 100 Ω is connect behind the main microstrip lines of 50 Ω, per all the way
The microstrip line of 100 Ω is followed by quarter wavelength impedance transducer, and characteristic impedance is converted to 50 Ω；Become alternatively by impedance
Afterwards per the 100 Ω microstrip lines for connecing two-way parallel connection again all the way, one-to-two is carried out, to form the conical beam of similar monopole,
Omnidirectional's covering is obtained in horizontal plane.
5. conical beam wide-band slot antenna array according to claim 1 or 2, which is characterized in that the first medium
Substrate uses Rogers 4360G2 medium substrates.
6. conical beam wide-band slot antenna array according to claim 2, which is characterized in that the second substrate uses
Rogers 4350B substrates.
7. one kind wearing VR equipment, which is characterized in that claim 1-6 any one of them conical beam wide-band slot antenna battle arrays
Row are arranged at the top for wearing VR equipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721819311.6U CN207611868U (en) | 2017-12-20 | 2017-12-20 | A kind of conical beam wide-band slot antenna array and wear VR equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721819311.6U CN207611868U (en) | 2017-12-20 | 2017-12-20 | A kind of conical beam wide-band slot antenna array and wear VR equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108232437A (en) * | 2017-12-20 | 2018-06-29 | 华南理工大学 | A kind of conical beam wide-band slot antenna array and wear VR equipment |
| CN109546316A (en) * | 2018-10-31 | 2019-03-29 | 安徽四创电子股份有限公司 | A kind of antenna element |
| CN113991295A (en) * | 2021-11-12 | 2022-01-28 | 京信射频技术(广州)有限公司 | Vehicle-mounted antenna |
| CN114374098A (en) * | 2021-12-23 | 2022-04-19 | 西安电子科技大学 | Cavity monopole subarray antenna with adjustable broadband low-profile AMC wave beam |
-
2017
- 2017-12-20 CN CN201721819311.6U patent/CN207611868U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108232437A (en) * | 2017-12-20 | 2018-06-29 | 华南理工大学 | A kind of conical beam wide-band slot antenna array and wear VR equipment |
| CN108232437B (en) * | 2017-12-20 | 2024-03-15 | 华南理工大学 | Tapered wave beam broadband slot antenna array and head VR equipment |
| CN109546316A (en) * | 2018-10-31 | 2019-03-29 | 安徽四创电子股份有限公司 | A kind of antenna element |
| CN113991295A (en) * | 2021-11-12 | 2022-01-28 | 京信射频技术(广州)有限公司 | Vehicle-mounted antenna |
| CN114374098A (en) * | 2021-12-23 | 2022-04-19 | 西安电子科技大学 | Cavity monopole subarray antenna with adjustable broadband low-profile AMC wave beam |
| CN114374098B (en) * | 2021-12-23 | 2022-12-06 | 西安电子科技大学 | Cavity monopole subarray antenna with adjustable broadband low-profile AMC wave beam |
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