CN106935982A - Planar array antenna - Google Patents
Planar array antenna Download PDFInfo
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- CN106935982A CN106935982A CN201511030537.3A CN201511030537A CN106935982A CN 106935982 A CN106935982 A CN 106935982A CN 201511030537 A CN201511030537 A CN 201511030537A CN 106935982 A CN106935982 A CN 106935982A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- Waveguide Aerials (AREA)
Abstract
The present invention relates to the communications field, disclose a kind of planar array antenna, the planar array antenna is included substrate and is attached to multiple irradiation devices of the first surface of the substrate and the power divider of the multiple irradiation device is connected by micro-strip, wherein each described irradiation device includes 4 rectangular patch antennas connected by micro-strip, and 4 rectangular patch antennas are set to have 0 °, 45 °, 90 ° and 135 ° phase difference respectively.By above-mentioned technical proposal, artificial additional 0 °, 45 °, 90 °, 135 ° of phase difference on the individual radiation body of order rotation array antenna, and individual radiation body is rotated 45 ° with the direction of right-hand circularly polarized wave, so, even if off-center frequency, according to the superposition of each polarized wave, it is possible to achieve circularly polarized wave.
Description
Technical field
The present invention relates to the communications field, in particular it relates to a kind of planar array antenna.
Background technology
Intelligence transportation information system (intelligent transport system, ITS) is to be interspersed in electrical equipment, electricity
The sophisticated technology systems technology related to railway and highway system such as son, control, information, communication, computer, automobile, is also with industry
Development and the process of urbanization, in order to effectively tackle increasingly deep traffic problems, and effectively improve traffic mobility,
Security, the traffic environment of efficiency and the new traffic system that produces.
ITS improves the utilization ratio of means of transportation, releases traffic difficulties, ensures that the unimpeded and vehicle of road is reduced completely
Traffic accident, realizes the informationization of popular traffic and automation, the informationization of logistics system, and provide various transport information
Collection, filtering services, convenient and traffic safety can be provided to user and manager.
DSRC (Dedicated short range communication, DSRC) is to realize ITS and produce
New short-range communication means, regard as realizing at present the optimal communication technology of ITS.DSRC is provided in the trackside list in roadside
Wireless digital is realized between end communicator (on board unit, OBU) on first (road side unit, RSU) and vehicle
The communication system of communication, is to be adapted to and vehicle pass-through unmanned charge system electronic Fare Collection System Electronic Toll
Collection, ETC) information is carried out in the communication mode for providing, transmitting the diverse services such as traffic signals.
The use frequency range of DSRC (DSRC) is 5.8GHz, communication of the roadside unit (RSU) and vehicle between away from
Between for several meters to hundreds of meters, data transfer rate can reach the wireless communication speeds of two-way more than 1Mbps.Constitute ITS systems
DSRC (DSRC) system of system is designed to the pattern of two-way communication, and considers the speed of the vehicle on track in the design
The factor such as degree, track quantity, the width in track, makes the smooth of guarantee communication of the system in different traffic environments.
Because so, the antenna of roadside unit (RSU) is in order to prevent from being done with the communication on other vehicles on the track of periphery
Disturb, it is necessary to limit beam angle and secondary lobe size in its horizontal extent；Further, for remote communication characteristic, it is necessary to have
High-gain and receiving is returned circular polarisation (the Right handed Circular of signal by multiple reflections
Polarization, RHCP) characteristic structure design.
In order to adapt to, using the unimpeded of the radio communication of DSRC (DSRC) mode of 5.8GHz frequency ranges, be arranged on
Antenna (OBU) requirement of the vehicle communication device on vehicle is designed to, not by installation site and position, to enter with roadside base station
The 3dB beam antennas wide of the unimpeded communication of row, but be subject in particular range just can be with for the Antenna Design of the roadside unit of DSRC
The limitation of the radiation beam communicated with the OBU on vehicle.Antenna requirement for roadside unit is to be applied to 3-4
The vertical 3dB beam angles of meter Lu Kuan, also require the level that can be communicated within 10-15 meters of maximum on road driving direction
3dB beam angles, and, to reduce the influence of the multipath reflection reflected by other reflector as far as possible, it is desirable to dextrorotation entelechy
Change (RHCP) characteristic.In order to realize the antenna of this high gain characteristics with plane configuration and circular polarization characteristics, must design
Into the micro-strip array antenna of single feed structure.The circular polarization array antenna of this single feed structure, to offset feeder line
Unnecessary radiation realize multiple terminated line, and be maintained the axle ratio characteristic drafted and appropriate 3dB beam angles with
And secondary lobe size.Typically, the fairly simple side of circularly polarized wave is realized in the quadrangle micro-strip of array in order to obtain high-gain
Method has following example, or uses the power-splitting devices with 90 ° of phase differences, or using mixing (Hybrid) device feed
Method.
By radiating the feed on micro-strip side, TM is inducedx 010Mode wave, further through the feed on the another side of radiation micro-strip
Induction TMx 001Ripple and obtain circularly polarized wave.But, when using above-mentioned feeding classification, the circularly polarized wave produced in high-order mode
In accordingly to be fed spacing be extremely difficult, and, complicated feeder line not only produces unnecessary radiation and reduces antenna
Radiation efficiency, also increase array antenna physical size.Therefore, the first-selected single feeding classification of the feed of array antenna.It is logical
Cross single feed and realize that the concrete methods of realizing of circular polarisation is, produced in optional frequency formed objects (intensity) and 2 it is orthogonal
The method fed on mould position.It is exactly radiation micro-strip to be carried out the deformation of physics, makes 2 of generation in certain centre frequency
Assertive evidence mould, it is mutually perpendicular to and size is identical, and when there is 90 ° of phase differences, produces circular polarisation.The electric field of this mould radiation is phase
It is mutually vertical, and produce circular polarisation on broadside (Broad side) direction.
Single feed angle Truncated (Corner truncated) radiating element of physical deformation is carried out on radiating element
Circular polarisation produce principle be：The electric current in the feed line direction of the single feed in excitation (excitation) to radiation patch is divided into
Two orthogonal modes, at this moment the size (amplitude) and phase of orthogonal mode are with centre frequency foCentered on, there is phase in its both sides
Potential difference is that 90 ° of resonant frequency is faAnd fbOrthogonal mode.The circular polarized wave antenna of this single feed structure is that no space makes
Increase form highly useful during array radiation device with the power divider of dual vertical feed or to obtain high-gain.
But, compared with the method for producing circularly polarized wave using duplex feeding mode, single feed there is also following shortcoming：Axial ratio bandwidth
It is narrower, the physical deformation rdativery sensitive of the resonant frequency bandwidth and axial ratio bandwidth of antenna to paster.And, in order to obtain system institute
It is required that radiation gain high and the feeding network of the antenna of array be placed in narrow space, this there may be irradiation device it
Between intercouple and feed line the radiation that causes of the electric leakage of itself, these be likely to increase extra minor level and
Influence the non-to becoming second nature of beam shape.
Sidelobe for the array antenna of roadside unit (RSU) requires that characteristic is the feedback by controlling individual radiation device
The weighted value method of electric current is realized.Array antenna is to increase the quantity of radiant body in structure to improve the gain of antenna,
And the narrow beam angle required by system is can obtain, but, also trigger the generation of numerous secondary lobes.
Regarding to the issue above, good solution is there is no in the prior art.
The content of the invention
It is an object of the invention to provide a kind of planar array antenna, the planar array antenna has high-gain and low pair
Valve characteristic.
To achieve these goals, the present invention provides a kind of planar array antenna, and the planar array antenna includes base
Plate and be attached to the substrate first surface multiple irradiation devices and the multiple irradiation device is connected by micro-strip
Power divider, wherein each described irradiation device include 4 rectangular patch antennas connected by micro-strip, 4 rectangle patches
Chip antenna is set to have 0 °, 45 °, 90 ° and 135 ° phase difference respectively.
Further, each in 4 rectangular patch antennas, on the basis of micro-strip input, the upper right corner and a left side
Inferior horn is notched with diagonal.
Further, the scope of the spacing between adjacent two 4 rectangular patch antennas is to be less than λ more than λ g/2
G, wherein λ g are medium medium wavelength.
Further, the scope of the spacing between adjacent two 4 rectangular patch antennas is to be less than more than 0.8 λ g
λg。
Further, the spacing between adjacent two 4 rectangular patch antennas is 0.72 λ g.
Further, the material of the substrate is F4B.
Further, the dielectric constant of the substrate is 2.2.
Further, the quantity of the multiple irradiation device is 4, and 4 irradiation devices are attached to the of the substrate
One surface causes that rectangular patch antenna is in 2 × 8 arrays.
Further, 2 × 8 array is the first stage from center line to both sides the 1st and 2 rows, and the 3rd row is second-order
Section, and the 4th row is the phase III, wherein the first stage, the second stage and the phase III met for three stages
Taylor is distributed.
Further, the electrical power distribution of the power divider between the first stage and the second stage is
1：4；And the electrical power distribution of the power divider between the second stage and the phase III is 1：4.
By above-mentioned technical proposal, on the individual radiation body of order rotation array antenna it is artificial it is additional 0 °, 45 °, 90 °,
135 ° of phase difference, and individual radiation body is rotated 45 ° with the direction of right-hand circularly polarized wave, so, even if off-center frequency,
According to the superposition of each polarized wave, it is possible to achieve circularly polarized wave.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of specification, with following tool
Body implementation method is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 (a) and Fig. 1 (b) are the planar array antenna structural representations that embodiment of the present invention is provided；
Fig. 2 is the array antenna detail elevation using order rotation mode in embodiment of the present invention；
Fig. 3 be embodiment of the present invention in realize multiport electric current distribution power divider schematic diagram；
Fig. 4 (a) and Fig. 4 (b) are Taylor's distributed current distribution network diagram of order rotation array antenna；
Fig. 5 is the reflection loss figure of 2 × 8 array antennas of the order rotation mode of Sidelobe characteristic；
Fig. 6 is the axle ratio characteristic figure of 2 × 8 array antennas of order rotation mode；
Fig. 7 (a) is phi=0 ° of cross polarization discrimination (XPD) characteristic of 2 × 8 array antennas of order rotation mode；
Fig. 7 (b) is phi=90 ° of cross polarization discrimination (XPD) characteristic of 2 × 8 array antennas of order rotation mode；
Fig. 8 (a) is 5790MHz elevation radiation patyterns；
Fig. 8 (b) is 5800MHz elevation radiation patyterns；
Fig. 8 (c) is 5830MHz elevation radiation patyterns；
Fig. 8 (d) is 5840MHz elevation radiation patyterns；
Fig. 9 (a) is 5790MHz horizontal radiation patterns；
Fig. 9 (b) is 5800MHz horizontal radiation patterns；
Fig. 9 (c) is 5830MHz horizontal radiation patterns；
Fig. 9 (d) is 5840MHz horizontal radiation patterns；And
Figure 10 is the read range actual test result schematic diagram carried out with reference to conventional OBU response sensitivities.
Description of reference numerals
100：Substrate；
101：Conclude the connecting hole of external structure thing (antenna casing) and metal supporting frames；
200：RF irradiation devices with right-handed circular polarization (RHCP) radiation characteristic；
210：To the single feeding network of radiant body feed；
220：Realize the feeding network of different phase electricity distribution；
300：The ground plane being grounded altogether with antenna；
400：With the RF ports of outside source line.
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Below, case study on implementation of the invention describes its constitutive characteristic and action effect in detail with reference to attached photograph drawing.
Fig. 1 is (a) and Fig. 1 (b) is the planar array antenna structural representation of embodiment of the present invention offer.Using setting
Put the mounting hole 101 of the even number on the periphery of substrate 100, fixed exterior structure thing (shell) and metal supporting frames can be with
The planar array antenna structure is installed with arbitrary angle.Overall roadside unit (RSU) micro-strip array antenna is for certain party
Upward radiation directivity, structure inside can be with the setting angle of arbitrarily angled regulation array antenna, and with structure (outward
Shell) there is the array antenna of same setting angle, also can keep radiation directivity according to structure setting angle in itself.This hair
The planar array antenna structure that bright implementation method is provided is that the roadside unit (RSU) based on DSRC (DSRC) uses day
Line, its specific composition can include：Reliably launch/receive 5.8GHz frequency ranges on the substrate 100 for limiting area
The irradiation device 200 of the array antenna of communication；It is (or micro- to the feed line of irradiation device pumping signal with single feeding classification
Band) 210；For appropriate beam angle and Sidelobe characteristic, realize that different phase Taylor is distributed in the loop of feeding dividers
Electrical power distribution network 210 and 220；With the grounding parts 300 at the back side of substrate 100 that array antenna shares same ground connection；For
It is connected to the port 400 of the RF connectors of outside source.The profit of distribution networking 210 and 220 of signal is provided to irradiation device 200
With basic λ g/4 impedance shift theories, wherein λ g are medium (for example, F4B) medium wavelength, to be matched between improvement distribution networking
Characteristic, its form becomes to cut form, and using the structure of radiating element 200 is pressed close to, it is single with the distribution network 210 and radiation that cause
The design that interference and coupling influence between unit 200 are minimized.
It is the feed line that make use of the single feed being activated on radiating element that the circular polarisation of irradiation device 200 produces principle
Two orthogonal modes that the electric current in direction is divided into.The RF substrates 100 used in embodiments of the present invention can be 1.6mm thickness
, dielectric constant (ε r) is 2.2 F4B sheet materials.
Fig. 2 is the array antenna detail elevation using order rotation mode in embodiment of the present invention.In order to embody list
The generation of the right-handed circular polarization (RHCP) of the micro-strip array antenna of one feed, on the basis of the input port of micro-strip, common 4 jiaos
With diagonal corner cut, each irradiation device 200 is included by micro- in the upper right corner and the lower left corner of paster (rectangular patch) antenna
4 rectangular patch antennas (for example, square patch antenna) with connection, two rectangular patch antennas being connected use λ g/4
Impedance transformer is connected, and realizes the impedance matching of the irradiation device of multiple feeder line and single antenna.Typically, single battle array
Array antenna, its axial ratio bandwidth will drastically diminish further away from centre frequency, and gain roadside unit (RSU) antenna also compared with DSRC
Benchmark it is low, and embodiment of the present invention provide above-mentioned connected mode can improve simultaneously circular polarized wave antenna axial ratio bandwidth and
Gain.
The general principle of order rotation array antenna is to adjust benchmark distributing point to the distance of each rectangular patch antenna, makes feedback
Reflected voltage is offset on electricity point.And, it is the phase of the order of each rectangular patch antenna that the difference for compensating feeder line causes
Postpone, should rotate the order of rectangular patch antenna physics, make the electric field of each rectangular patch antenna radiation with the time into same side
To.It is artificial to 0 °, 45 °, 90 °, 135 ° of each rectangular patch antenna phase difference in embodiments of the present invention, and rectangle is pasted
Chip antenna is with 45 ° of the rotation of right-handed circular polarization (RHCP) direction order.Although so deviate from resonance centre frequency, can be according to
Circularly polarized wave is realized in superposition by each polarized wave.When those skilled in the art know the array antenna on same plane is designed,
The factor to be considered in design is that spacing is very between the distance between center and its center of irradiation device, i.e. irradiation device
Important.This turns into the key factor in the direction and gain that determine main lobe, and during more than wavelength (λ g), array antenna finds out model
Enclose interior generation main lobe graing lobe of a size (Grating lobe).Reverse side, if irradiation device spacing is too small, although do not produce
Raw graing lobe, but, the Deformation Reasons as far-field radiation lobe that intercouple between irradiation device, so as to increase secondary lobe electricity
It is flat, also produce ineffective radiation lobe (Pattern null).
Therefore, two of the invention 4 rectangular patch antenna spacing are selected in λ g/2<d<In λ g ranges, rule are realized
Graing lobe in 4 jiaos fixed of master is minimized.General rectangular patch antenna bigger its radiation gain of spacing is also bigger, but spacing is more than
During 0.7 λ g, the situation that gain reduces on the contrary is there is also.Further, follow the axle of rectangular patch antenna spacing is than change, keeps
Its axle ratio characteristic is relatively good during 0.8 λ g above spacing.Because rectangular patch antenna spacing is bigger, the shadow that intercouples therebetween
The reason for sound is smaller.To meet the working characteristics of circular polarized wave antenna, can be with 0.8 outstanding λ g of chosen axis ratio characteristic<d<1.0λg
Scope, it is also possible to select the d=0.72 λ g of optimum gain characteristic.
In order to meet roadside unit (RSU) array antenna Sidelobe characteristic requirements, it is necessary to pass through control rectangle paster
Electric current weighting value on antenna is realized.In array antenna structure, antenna is increased by the increase of rectangular patch antenna quantity
Radiation gain, and obtain the narrow-band beam width required by system, but numerous secondary lobes will be produced simultaneously.Therefore, in order to obtain
Appropriate beam angle and Sidelobe characteristic, it is necessary to select optimum array spacing and use Taylor's location mode, to realize entirety
The compactedness of antenna structure and preferably performance.
Fig. 3 be embodiment of the present invention in realize multiport electric current distribution power divider schematic diagram.As shown in figure 3,
Set feed current is provided on individual rectangular paster antenna in order to give, the width design of power divider is into left and right unsymmetrical knot
Structure, so as to embody different impedance designs, finally realizes the impedance matching in array-fed loop.According to Taylor's distribution, secondary lobe makes a reservation for
When design load is -25dB, the electrical power distribution for devising array device is 1：4(0.25：1) feeding circuit.System requirements
The predetermined design of secondary lobe size be -25dB, and array device distribution be expanded to 3 stages be distributed when, the irradiation device of array
On feed current controllable be made 1：0.25：0.0625.In this CURRENT DISTRIBUTION side according to Taylor's distributed controll different phase
In method, 3 ports of the prime power distributor of array antenna all use the impedance matching of 50 Ω, to realize 1：4(0.25：1)
Electric current is distributed, and using the impedance shift theory of λ g/4, the λ g/4 resistances of 56 Ω and 112 Ω can be respectively connected on port 2 and port 3
Anti- transformation loop.
Fig. 4 (a) and Fig. 4 (b) are Taylor's distributed current distribution network diagram of order rotation array antenna, are shown in Fig. 4
Go out to improve the array antenna that 2x8 antenna sidelobe levels have used the electrical distribution circuit network according to Taylor's distribution.In Fig. 4
Shown planar array antenna constitutes 2 × 8 rectangular patch antenna arrays, above-mentioned 2 × 8 gusts to be arranged in 4 irradiation devices
Row were the 1st stage from center line to both sides the 1st and 2 rows, and the 3rd row was the 2nd stage, and the 4th row was the 3rd stage, wherein described
1st stage, the 2nd stage and the 3rd stage meet three stage Taylors distribution.Positioned at the 1st stage and the 2nd rank
The electrical power distribution of the power divider between section is 1：4；And the work(between the 2nd stage and the 3rd stage
The electrical power distribution of rate distributor is 1：4.For the weighted value of electric current between the stage 1 at control arrangement center and arranged in proximity 2 sets
Power distribution circuit net is put, electric power distribution electricity has been equally constituted between stage 2 and stage 3 based on unit successively rotation mode
Road network.Arrangement rectangular patch antenna constitutes 2 radiating doublets according to unit successively rotation mode in vertical plane, due to such row
Array structure cannot effective control electric current weighted value, therefore distributor circuit net is constituted not in vertical plane.It should be noted that
The unit arrangement of the order rotation array antenna in the present invention, can be various geometric arrangement expansion compositions in horizontal plane.
Fig. 5 is the reflection loss figure of 2 × 8 array antennas of the order rotation mode of Sidelobe characteristic.As shown in figure 5,
The reflection loss bandwidth of 10dB benchmark is from 5.6GHz to 5.92GHz, i.e., with 320MHz bandwidth, to be come with centre frequency 5.8GHz
If calculating, about 5.5% bandwidth.This covers the upstream frequency 5.79GHz-5.80GHz and downlink frequency of modular system requirement
Rate 5.83GHz-5.84GHz scopes, when its minimal reflection penalty values is 5.8GHz, about -33dB.
Fig. 6 is the axle ratio characteristic figure of 2 × 8 array antennas of order rotation mode.As shown in fig. 6, centre frequency is
During Θ (theta) angle of 5.82GHz is -90 ° of -+90 ° of scopes, horizontal plane interior axle ratio and vertical plane during Φ=90 ° during Φ=0 °
Interior axle ratio.With 3dB reference ranges, its axle ratio characteristic is that Θ angles are 0 ° of Φ=0 ° direction in (the maximum direction of radiation gain)
Upper is 0.4dB, is 0.5dB on the direction of Φ=90 °.In embodiments of the present invention, the upper right corner of 4 common butt chock antennas
Its angle is cut away with diagonal with the lower left corner, to embody unit sequence rotation array antenna, is applied using artificial on each paster
Plus 0 °, 45 °, 90 °, the 135 ° mode of phase difference, realize the axle ratio characteristic of satisfaction in full bandwidth needed for system.
Fig. 7 (a) and 7 (b) are shown 2 × 8 array antennas of the order rotation mode that embodiment of the present invention is provided, in
Cross polarization discrimination (Cross-polarization when frequency of heart is 5.82GHz on Φ=0 ° and Φ=90 ° direction
Discrimination, XPD) characteristic.Shown in Fig. 7 (a), on the direction of Φ=0 °, the right-handed circular polarization of radiation gain maximum
(RHCP) radiation gain is 17.1dB, and LHCP radiation gains are -13.7dB, the drop (difference in size) of its cross polarization (XPD)
It is 31.2dB.In the angle of radiation of greatest irradiation gain difference 3dB, the drop of its cross polarization (XPD) is 16.6dB, is met
The cross polarization mirror of more than the 10dB on cross polarization (XPD) drop and angle of radiation of more than the 15dB required by system standard
Not rate (XPD) drop requirement.
Fig. 7 (b) shows that on the direction of Φ=90 °, right-handed circular polarization (RHCP) radiation gain of radiation gain maximum is
17.2dB, LHCP radiation gain are -14.0dB, and the drop of its cross polarization discrimination (XPD) is 31.2dB.And, the ratio of gains
On direction at maximum gain less than 3dB, the drop of its cross polarization discrimination (XPD) is 10.2dB.Therefore, it is of the invention suitable
The circularly polarized wave characteristic of sequence rotation array technology, in the full frequency band as shown in its axle ratio characteristic and cross polarization (XPD) result
With outstanding performance.
Fig. 8 (a)-(d) and shown in Fig. 9 (a)-(d) be centre frequency azimuth (azimuth angle) and elevation angle
The far-field radiation pattern of (elevation angle), Fig. 8 (a)-(d) refers to the radiation diagram in vertical plane, and 9 (a)-(d) is yes
It is horizontal radiation pattern.As shown in Fig. 8 (a)-(d), the angle of radiation of most intense radiation is produced to be perpendicular to array day
The vertical plane of line plane, its greatest irradiation gain is 17dBi, main lobe half-power width (Half Power in vertical plane
Beamwidth, 3dB) it is 38 °, it is front and rear than being 23dB.As shown in 9 (a)-(d), the greatest irradiation gain in horizontal plane is
17dBi, main lobe half-power width is 9 ° in vertical plane, front and rear than being 23dB.
As shown in far-field radiation pattern, about 38 ° of the main lobe half-power width in vertical plane, this can be in the walking of vehicle
The radiation directivity of effective distribution antenna on direction, about 9 ° of main lobe half-power width in horizontal plane, this opposite, narrow
Half-power width can avoid interfering for adjacent track.
Figure 10 is the read range actual test result schematic diagram carried out with reference to conventional OBU response sensitivities.Such as Figure 10 institutes
Show, roadside unit (RSU) antenna for the foundation order rotation technique that embodiment of the present invention is provided is in practical service environment
Tested, the relative induction intensity of OBU is illustrated on ground surface.The ground surface 5 of the travel side of vehicle approach axis
Rice eminence, 45 ° of inclination angles are mounted with RSU array antennas.Test result shows that at this moment the maximum on vehicle heading recognizes distance
It it is 20 meters, the maximum identification distance on road width direction is 3.4m.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in range of the technology design of the invention, various letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy is no longer separately illustrated.
Additionally, can also be combined between a variety of implementation methods of the invention, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (10)
1. a kind of planar array antenna, it is characterised in that the planar array antenna includes substrate and is attached to the substrate
First surface multiple irradiation devices and the power divider of the multiple irradiation device is connected by micro-strip, wherein
Each described irradiation device includes 4 rectangular patch antennas connected by micro-strip, and 4 rectangular patch antennas are set
To have 0 °, 45 °, 90 ° and 135 ° phase difference respectively.
2. planar antenna according to claim 1, it is characterised in that each in 4 rectangular patch antennas,
On the basis of micro-strip input, the upper right corner and the lower left corner are notched with diagonal.
3. planar antenna according to claim 1, it is characterised in that two adjacent 4 rectangular patch antennas
Between the scope of spacing be that less than λ g, wherein λ g are medium medium wavelength more than λ g/2.
4. planar array antenna according to claim 3, it is characterised in that two adjacent 4 rectangular patches
The scope of the spacing between antenna is to be less than λ g more than 0.8 λ g.
5. planar antenna according to claim 3, it is characterised in that two adjacent 4 rectangular patch antennas
Between spacing be 0.72 λ g.
6. planar antenna according to claim 1, it is characterised in that the material of the substrate is F4B.
7. planar antenna according to claim 6, it is characterised in that the dielectric constant of the substrate is 2.2.
8. planar antenna according to claim 1, it is characterised in that the quantity of the multiple irradiation device is 4, should
4 irradiation devices are attached to the first surface of the substrate so that rectangular patch antenna is in 2 × 8 arrays.
9. planar antenna according to claim 8, it is characterised in that 2 × 8 array is from center line to both sides the 1st
It it is the first stage with 2 rows, the 3rd row is second stage, and the 4th row is the phase III, wherein the first stage, described second
Stage and the phase III meet three stage Taylors distribution.
10. planar antenna according to claim 9, it is characterised in that positioned at the first stage and the second-order
The electrical power distribution of the power divider between section is 1：4；And
The electrical power distribution of the power divider between the second stage and the phase III is 1：4.
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| CN201511030537.3A CN106935982B (en) | 2015-12-31 | 2015-12-31 | Planar array antenna |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494488A (en) * | 2017-09-12 | 2019-03-19 | 湘南学院 | A kind of extensive circular polarised array antenna of efficient low section |
| CN109638442A (en) * | 2018-12-21 | 2019-04-16 | 汪鑫志 | A kind of broadband circle polarized array antenna structure |
| CN112086745A (en) * | 2020-09-30 | 2020-12-15 | 广州市埃特斯通讯设备有限公司 | ETC antenna fused with V2X equipment |
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