CN108615980A - A kind of ellipse with dual polarised radiation mould sews flexible waveguide - Google Patents
A kind of ellipse with dual polarised radiation mould sews flexible waveguide Download PDFInfo
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- CN108615980A CN108615980A CN201810533920.8A CN201810533920A CN108615980A CN 108615980 A CN108615980 A CN 108615980A CN 201810533920 A CN201810533920 A CN 201810533920A CN 108615980 A CN108615980 A CN 108615980A
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- 230000005855 radiation Effects 0.000 title claims abstract description 27
- 230000009977 dual effect Effects 0.000 title claims abstract description 15
- 230000010287 polarization Effects 0.000 claims abstract description 51
- 238000004049 embossing Methods 0.000 claims abstract description 5
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 238000009958 sewing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
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- 230000005540 biological transmission Effects 0.000 abstract description 20
- 238000004891 communication Methods 0.000 abstract description 14
- 230000008054 signal transmission Effects 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 5
- PLAIAIKZKCZEQF-UHFFFAOYSA-N methyl 6-chloro-2-oxo-3h-1,2$l^{4},3-benzodithiazole-4-carboxylate Chemical compound COC(=O)C1=CC(Cl)=CC2=C1NS(=O)S2 PLAIAIKZKCZEQF-UHFFFAOYSA-N 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
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- 238000005859 coupling reaction Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/22—Longitudinal slot in boundary wall of waveguide or transmission line
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Abstract
The invention discloses a kind of ellipses with dual polarised radiation mould to sew flexible waveguide, including the molding oval metallic waveguide of two embossing disposed in parallel, two oval metallic waveguides are externally provided between oversheath and oversheath and are connected by dowel, the vertical polarization that radiation vertically polarized wave is respectively equipped on the same side end face of two oval metallic waveguides sews unit and the horizontal polarization of radiation level polarized wave sews unit, and vertical polarization sews vertically polarized wave caused by unit and the horizontal field strength difference 20dB or more sewed between horizontal polarized wave caused by unit；The present invention sews the multiple-input and multiple-output that flexible waveguide realizes rail transit field wireless signal transmission by one, and improve the isolation between unlike signal, ensure the high power capacity high-quality transmission of signal in different channels, and realizes interconnecting and adapting to 5G development use demands for more communication systems such as the comprehensive carrying CBTC of car-ground radio transmission based on LTE, PIS, Wi Fi and LTE U.
Description
Technical field
The present invention relates to wireless communication and signal transmission technology fields more particularly to a kind of ellipse with dual polarised radiation mould
Circle sews flexible waveguide.
Background technology
Currently, with the development of urban track traffic wireless communication technique, the train automatic controlling system based on communication
(Communication Based Train Control System, CBTC) has been answered in city rail traffic signal system extensively
With.The frequency range of existing CBTC signal systems is 2.4GHz~2.5GHz, and at present in the electronic equipment of frequency range application
It is numerous, including Wi-Fi, iPad, wireless mouse, wireless phone, bluetooth equipment and medical treatment detection device etc., it undoubtedly can to vehicle
Wireless signal transmission system causes different degrees of interference, influences the safe operation of train.
MIMO technology refers to using multiple transmitting antennas and reception antenna respectively in transmitting terminal and receiving terminal, and signal is made to pass through
The mutiple antennas of transmitting terminal and receiving terminal is transmitted and is received, and so as to improve communication quality, realizes multi-carrier frequency fusion and multisystem
Interconnect.This technology can make full use of space resources, and multiple-input multiple-output is realized by mutiple antennas, not increase frequency spectrum money
In the case of source and antenna transmission power, system channel capacity can be increased exponentially, under being considered as because having a clear superiority
The core technology of one third-generation mobile communication, the wireless signal transmission of domestic city rail traffic at present field also start technique in succession
Research and experiment work, Huawei Company planned in BYD cloud rail project using this frequency spectrum carry LTE-U systems realize
Train-ground communication function, and it is 4.8GHz~5.0GHz that country, which has issued frequency outside 5G frequency spectrums room,.
Existing urban track traffic car-ground radio transmission LTE synthesis bearing system generally use antenna, leaky cable and
Three kinds of transmission mediums of leaky waveguide, wherein leaky waveguide transmits signal reliability highest, transmission range longest, by outer because having
Boundary's environmental impact minimization, working frequency can be used widely according to advantages such as wave-guide cavity wave structure size determinations.Based on vehicle
Influence of the reliability and external electromagnetic environment of earth signal transmission to city rail traffic signal system, the following leaky waveguide will be wide
The general car-ground radio signal transmission system applied to 3GHz or more.
When using MIMO technology, existing leaky waveguide paving mode includes mainly two kinds, and one is be spaced a spacing
Flexible waveguide is sewed from two ellipses are laid with, another kind is to be laid with a rectangle leaky waveguide with dual polarised radiation mould.When adopting
When carrying out networking with the former, two ellipses sew flexible waveguide and have to keep a determining deviation that MIMO functions just can be achieved, and cause to apply
If many other adverse effects, such as space is big, difficulty of construction is big, installation cost and maintenance cost increase, can also be to the circuit of other departments
Construction, maintenance also result in inconvenience；When carrying out networking using the latter, due to the architectural characteristic of rectangle leaky waveguide, can lead
It causes to occur so that there are following problems：(1) it can only be laid on the outside of track or on the inside of track, laying space is limited；(2) rectangle leaks
It lets out and is laid on trackside along waveguide, neighbouring several sections of rectangle leaky waveguides, which need to be dismantled, when repairing rail can just carry out, after rail
Phase maintenance brings inconvenience；(3), it can not be bent because rectangle leaky waveguide can only make straight tube, transport and carry inconvenience；
(4), single rectangle leaky waveguide distance is shorter, and the tie point in unit distance is more, and junction installment work is numerous when being not only laid with
Weight, tie point excessively also give the communication security of entire communication network to cause great hidden danger；(5), by installation environment and structure
It influences, rectangle leaky waveguide is expanded with heat and contract with cold, and phenomenon is serious, and every 300 meters of line length expanding with heat and contract with cold just can reach according to statistics
700mm is big, causes easily to be pulled loose at connecting flange, and then rectangle leaky waveguide is caused to be made moist into water, influences entirely to communicate
The safety of network；(6) the waterproof and dampproof poor performance of rectangle leaky waveguide easily leads to internal wetted water inlet, and then influences communication quality；
(7), it is influenced obviously by complicated metro environment, rectangle leaky waveguide can be by the galvano-cautery of train DC power-supply system and because of ring
The serious harm for the chemical attack that border generates, since rectangle leaky waveguide with the wide face for sewing hole only to protecting, at it
Excess-three face will appear the phenomenon that corrosion damage, and communication system is caused to be paralysed.
Invention content
The object of the present invention is to provide a kind of ellipses with dual polarised radiation mould to sew flexible waveguide, can pass through laying one
Root sews flexible waveguide and realizes the MIMO technique of rail transit field wireless signal transmission, while improving between unlike signal
Isolation, ensure the high power capacity high-quality transmission of signal in different channels, and it is comprehensive to realize that car-ground radio based on LTE transmits
Close interconnecting and adapting to 5G development use demands for more communication systems such as carrying CBTC, PIS, Wi-Fi and LTE-U.
The technical solution adopted by the present invention is：
A kind of ellipse with dual polarised radiation mould sews flexible waveguide, including two disposed in parallel oval metal waveguides
Pipe, oval metallic waveguide use the bellows that embossing moulding process is formed, are arranged with outside two oval metallic waveguides outer
It is connected as one by dowel between sheath and two oversheaths；On the same side end face of described two ellipse metallic waveguides
The vertical polarization for being respectively provided with radiation vertically polarized wave sews unit and the horizontal polarization for radiation level polarized wave is leaked
Let out unit, vertical polarization is sewed vertically polarized wave and level caused by unit and sewed between horizontal polarized wave caused by unit
Field strength differ 20dB or more；
The vertical polarization sew unit include multigroup length direction along oval metallic waveguide it is evenly distributed hang down
Hole group is sewed in straight polarization；If the pitch that two adjacent groups vertical polarization sews hole group is P, thenM is integer, and 1≤m≤
10, the λ wavelength for electromagnetic wave under corresponding frequency of use in oval metal waveguide；It includes N number of that every group of vertical polarization, which sews group,
Vertical polarization along oval metallic waveguide length direction setting sews hole, 1≤N≤10；
It includes the evenly distributed water of multigroup length direction along oval metallic waveguide that the horizontal polarization, which sews unit,
Mean pole sews hole group, if the pitch that two adjacent groups horizontal polarization sews hole group is P ＇, thenM is integer, and 1
≤ m ＇≤10, λ are wavelength of the electromagnetic wave under corresponding frequency of use in oval metal waveguide；Every group of vertical polarization sews a group packet
It includes a vertical polarizations being arranged along oval metallic waveguide length direction of N ' and sews hole, 1≤N '≤10.
If the termination frequency of oval metal flexible waveguide is fstopIf any of which ellipse metal waveguide tube chamber cross section
Major diameter length is A, and minor axis diameter length is B, then the value range of major diameter length is 25.5mm≤A≤108.5mm,
The value range of minor axis diameter length is 12.5mm≤B≤65.5mm, corresponding termination frequency fstopValue range be
2.5GHz≤fstop≤11.7GHz。
The value range of the major diameter length of any oval metal waveguide tube chamber cross section is 48.5mm≤A
The value range of≤50.5mm, minor axis diameter length are 27.5mm≤B≤30mm, corresponding termination frequency fstopValue model
It encloses for 4.6GHz≤fstop≤6.6GHz。
If two wider side external surfaces of the ellipse metallic waveguide are wide face, outside the relatively narrow both sides of oval metallic waveguide
Surface is leptoprosopy, and towards front and back setting, vertical polarization sews unit and horizontal polarization in the wide face of two oval metallic waveguides
Unit is sewed to be separately positioned on the wide face in the same side of two oval metallic waveguides.
The set pass for sewing hole sews hole, " vertical bar type using line-styled on the oval metallic waveguide of described two
Sew hole ", " eight " font sews hole or continuous type sews arbitrary two kinds in hole；
It is the lateral strip-shaped hole for being parallel to oval metallic waveguide length direction, " one " word that the line-styled, which sews hole,
Type is sewed hole and is staggeredly successively set on up and down on the end face of corresponding oval metallic waveguide；
Described " eight " font sews oblique bar shaped of the hole for the length direction of center line and oval metallic waveguide in angle theta
Hole, same group of oblique strip-shaped hole are mutually parallel, and are located at same with the bottom end of the oblique strip-shaped hole of group and are parallel to oval gold
On the straight line for belonging to guide length direction, the oblique bar shaped pore structure of two adjacent groups is identical and along the radial direction of oval metal flexible waveguide
It is symmetrical；
It is the vertical strip-shaped hole perpendicular to oval metallic waveguide length direction that the vertical bar type, which sews hole, same group
The bottom end of vertical strip-shaped hole is located at same and is parallel on the straight line of oval metallic waveguide length direction；
The continuous type is sewed hole and is arranged on the wave crest of oval metallic waveguide, and same group of continuous type sews hole
It is separately positioned on and is sewed on the identical multiple continuous wave crests of hole number with continuous type.
The oversheath is equipped with the carrier cable for being parallel to oval metallic waveguide, and carrier cable includes steel successively from the inside to the outside
Cable and wirerope sheath, wirerope sheath are connected as one with oversheath.
The carrier cable is disposed over the lower section of the above and or below oversheath of oversheath.
The invention has the advantages that：
(1) by the way that parallel oval metallic waveguide is arranged, and divide on two same side end faces of oval metallic waveguide
Hole of sewing for radiating vertically polarized wave and horizontal polarized wave is not set, forms the different channels of transmission signal, realizes more
Application of the multi output technology in a leaky waveguide is inputted, while improving the isolation between unlike signal, ensures different channels
The high power capacity high-quality transmission of middle signal substantially increases system channel capacity, while system frequency range is promoted to 3GHz
To tens GHz；
(2) by using the oval metal waveguide of embossing structure, greatly strengthen the bending property of the present invention so that it can
It is coiled on Electric cable coil to lopping, joint length is long, not only facilitates transport and carrying, has broken original rectangle leaky wave
Manpower caused by leading the limitation that cannot grow section transport and carrying wastes, and reduces the tie point quantity in unit distance,
Laying efficiency is substantially increased, manpower waste is reduced；
(3) by vertical polarization being sewed unit and horizontal polarization sews unit respectively along the length of oval metallic waveguide
Direction is uniformly arranged on the wide face in the same side of two oval metallic waveguides, makes to sew on any one oval metallic waveguide
Signal strength caused by hole all has good flatness, and the received field strength difference of 50% probability and 95% probability is less than 2dB,
It is better adapted to the transmission of car-ground radio signal, meets the use demand of MIMO technology, meets the development trend of the communication technology；
(4) using good, the light-weight feature of the curvature of oval metal waveguide, the present invention can be made by the way that carrier cable is arranged
Both it can be fixed on the wall, can be also laid with as rectangle leaky wave conduit in-orbit by suspender as leakage coaxial cable
By road, mounting means is flexible, and easy for installation；
(5) by the way that outer jacket structure is arranged, comprehensive protection is carried out to sewing flexible waveguide, effectively avoids complicated ring
The corrosion of oval leaky wave conduit is damaged in border, and high degree strengthens waterproof moisture-proof effect, is ensureing waveguide performance
While, solve the perishable defect of traditional rectangular waveguide moisture-sensitive, ensured indirectly waveguide transmission safety and can
By property.
Description of the drawings
Fig. 1 is the structural schematic diagram of the embodiment of the present invention one；
Fig. 2 is the structural schematic diagram that vertical polarization sews hole group in Fig. 1；
Fig. 3 is the structural schematic diagram that horizontal polarization sews hole group in Fig. 1；
Fig. 4 is the cross section structure schematic diagram of Fig. 1；
Fig. 5 is to receive first wave conduit field strength analogous diagram using vertical polarized antenna in the embodiment of the present invention one；
Fig. 6 is to receive second waveguide pipe field strength analogous diagram using vertical polarized antenna in the embodiment of the present invention one；
Fig. 7 is to receive second waveguide pipe field strength analogous diagram using horizontally-polarized antenna in the embodiment of the present invention one；
Fig. 8 is to receive first wave conduit field strength analogous diagram using horizontally-polarized antenna in the embodiment of the present invention one；
Fig. 9 is the structural schematic diagram of the embodiment of the present invention two.
Reference sign：
1, first wave conduit；2, lateral strip-shaped hole；3, second waveguide pipe；4, vertical strip-shaped hole；5, oversheath；6, load
Rope；6a, wirerope；6b, wirerope sheath；7, dowel；8, oblique strip-shaped hole；9, continuous type sews hole.
Specific implementation mode
As shown in Figure 1, the present invention includes two disposed in parallel oval metallic waveguides, oval metallic waveguide, which uses, to be rolled
The bellows that line moulding process is formed, two oval metallic waveguides are arranged with oversheath 5, lead between two oversheaths 5 outside
Dowel 7 is crossed to be connected as one；Setting is parallel to the carrier cable 6 of oval metallic waveguide on oversheath 5, and carrier cable 6 is by interior
To including wirerope 6a and wirerope sheath 6b successively outside, wirerope sheath 6b is connected as one with oversheath 5, and the setting of carrier cable 6 is upper
The lower section of the above and or below oversheath 5 of square oversheath 5.
The vertical polarization that radiation vertically polarized wave is respectively provided on the front end face of two oval metallic waveguides is sewed
Unit and horizontal polarization for radiation level polarized wave sew unit, and vertical polarization sews vertically polarized wave caused by unit
And the horizontal field strength difference 20dB or more sewed between horizontal polarized wave caused by unit.
For a better understanding of the present invention, technical scheme of the present invention is described further below in conjunction with the accompanying drawings.
Embodiment one：
As shown in Figure 1, the present invention includes two oval metallic waveguides disposed in parallel, if the ellipse metallic waveguide
Two wider side external surfaces are wide face, and two relatively narrow side external surfaces of oval metallic waveguide are leptoprosopy, two oval metal waveguides
Guan Junkuan is facing towards front and back setting.
If the major diameter length of oval metallic waveguide cross section is A, if the short axle of oval metallic waveguide cross section
Diameter length is that the value of B, A and B meet following formula (1) and formula (2) simultaneously：
A>B and A ≈ 2kB (1)
In formula (1) and (2), k is oval metal waveguide pipe diameter correction factor, and the value range of k is 0.8~1, k1For
Oval metallic waveguide embossing correction factor, k1Value range be 0.8~1, ctFor free space electromagnetic wave propagation speed,
fstopFor the termination frequency of oval leakage metallic waveguide；The value range of major diameter length be preferably 25.5mm≤A≤
The value range of 108.5mm, minor axis diameter length are preferably 12.5mm≤B≤65.5mm, corresponding termination frequency fstop's
Value range is 2.5GHz≤f≤11.7GHz.Further, it is preferable to the value range of major diameter length be 48.5mm≤A≤
The value range of 50.5mm, minor axis diameter length are 27.5mm≤B≤30mm, corresponding termination frequency fstopValue range
For 4.6GHz≤f≤6.6GHz.In the present embodiment, A=49.35mm,That is A=28.75mm, fstop=5.3GHz.
If the oval metallic waveguide of top is first wave conduit 1, the oval metallic waveguide of lower section is second waveguide pipe
3.As shown in figure 4, the top of oversheath 5 of first wave conduit 1 is equipped with the carrier cable 6 for being parallel to first wave conduit 1, carrier cable 6 by
It is interior to including wirerope 6a and wirerope sheath 6b successively outside, wirerope sheath 6b is connected as one with oversheath 5.Utilize oval metal wave
Good, the light-weight feature of the curvature led, by by the hanging of carrier cable 6 first wave guide in the installation sites such as tunnel wall, laying
Set hole direction of sewing need to receive direction towards car antenna on pipe 1 and second waveguide pipe 3, you can realize the convenient peace of the present invention
Dress, can be both fixed on the wall by suspender as leakage coaxial cable, can be also laid with as rectangle leaky wave conduit
In orbit, mounting means is flexible, and easy for installation.
It is uniformly provided with multigroup vertical polarization in the horizontal direction on the wide face in front end of first wave conduit 1 and sews hole group；If adjacent
The pitch that two groups of vertical polarizations sew hole group is P, then P ≈ m λ/2, m is integer, and 1≤m≤10, λ make for electromagnetic wave in correspondence
With the wavelength under frequency in oval metal waveguide；It includes that two line-styleds sew hole that every group of vertical polarization, which sews group, adjacent
Line-styled sew hole up and down be staggered in the both sides up and down of the central axes in the wide face in 1 front end of first wave conduit.Such as Fig. 2 institutes
Show, it is lateral strip-shaped hole 2 that line-styled, which sews hole, if the pitch of two wave crests is L, two line-styleds sew the section between hole
Away from P1For 2L, it is 6L that two groups of vertical polarizations, which sew the pitch P between group,.
As shown in figure 3, being uniformly provided with multigroup horizontal polarization in the horizontal direction on the wide face in the front end of second waveguide pipe 3 sews hole
Group, horizontal polarization sew Kong Zuyu vertical polarizations and sew the position of hole group or more one-to-one correspondence；Every group of horizontal polarization sews hole group
Hole is sewed including two vertical bar shapes arranged side by side, vertical bar shape is sewed hole and set perpendicular to the length direction of oval metallic waveguide
It sets, and vertical bar shape is sewed the midpoint in hole and is arranged on the central axis of second waveguide pipe 3, each vertical bar shape sews hole and top the
Line-styled on one metallic waveguide sews hole upper and lower position correspondence.
The long side length of above-mentioned transverse direction strip-shaped hole 2 and vertical strip-shaped hole 4 is ranging from
Wherein, d indicates that the long side length of lateral strip-shaped hole 2 or vertical strip-shaped hole 4, λ are wave in the wavelength of free space, λgFor waveguide wave
Long, the value range of d is 5mm≤d≤25mm；Cross slat row hole or vertical strip-shaped hole 4 are all provided in the angle of long side and broadside
There are the chamfering, the value range of chamfer radius R to beC indicates the width edge length of Cross slat row hole or vertical strip-shaped hole 4.Such as figure
Shown in 3, it is 3L that two vertical bar shapes, which sew the pitch between hole, and it is 6L that two groups of horizontal polarizations, which sew the pitch between hole,.
The quality of the oval metallic waveguide radiance of assessment, is generally examined by the probability of its coupling loss.Leakage
The conduction electric current on the oval metal waveguide inside pipe wall of hole cut-out is let out, electric field is generated on sewing hole, and to oval metallic waveguide
Wall currents generate disturbance, and to free space coupling part electromagnetic energy out of oval metallic waveguide, and with sewing hole
The difference of position and shape and size is also different by the field strength for sewing hole to external radiation.
It is illustrated below with sewing the coupling loss in hole and car antenna：
The coupling loss for sewing hole and car antenna is acquired by following equation：
In formula (3), LcIndicate coupling loss, unit is decibel, PtIndicate the transimission power electricity in oval metallic waveguide
Flat, unit is dBm, PrIndicate the received power level of car antenna, unit is dBm.
The locally coupled loss probability value of generally use 50% and 95% weighs oval metallic waveguide radiance
Quality, i.e., the 50% locally coupled loss measured is less than the value less than the locally coupled loss that the value and 95% measure, same
In the case of probability value, coupling loss is smaller, and the received field strength of car antenna is stronger, and the radiance of oval metallic waveguide is got over
It is good.
The quality of transmission performance generally judges that the transmission loss of oval metallic waveguide is by following according to its transmission loss
Formula acquires：
aLWG=aWG+ar (4)
In formula (4), aLWGIndicate the transmission loss of oval metallic waveguide, aWGIndicate the transmission loss of elliptical waveguide, ar
Indicate the radiation loss of oval metallic waveguide, the size of radiation loss is related with the notch shape and size of sewing hole 2, generally
The value range of radiation loss is 0.05aWG≤ar≤0.2aWG；Wherein, the transmission loss a of elliptical waveguideWGCalculation formula such as
Under：
In formula (5), p indicates the resistivity of waveguide material, p0The resistivity for indicating copper material, in the present embodiment, p0Value is
1.7241x10-8Ω ﹒ m, t are elliptic flexible waveguide copper strips thickness, and a is waveguide inner section width, and a=A-t, b are that waveguide inner section is high
Degree, b=B-t, fcFor dominant waveguide transmission mode TE10Or H10Cutoff frequency, f is the corresponding frequency of transmission loss that is calculated, together
Under one frequency, transmission loss is smaller, and transmission performance is better.
When radiofrequency signal is injected in the present embodiment, first wave conduit 1 to the wave of external radiation be mainly vertically polarized wave,
Horizontal polarized wave is relatively weak, and car antenna have stronger directionality, same place using vertical polarized antenna into
When row signal receives, as shown in Figure 5 and Figure 6, received vertically polarized wave signal is better than horizontal polarized wave 20dB or more,
So will not be interfered to vertically polarized wave signal in same place horizontal polarized wave signal；The 3 outside spoke of institute of second waveguide pipe
The wave penetrated is mainly horizontal polarized wave, and vertically polarized wave is relatively weak, and car antenna has stronger directionality, same
When place carries out signal reception using horizontally-polarized antenna, as shown in Figure 7 and Figure 8, the horizontal polarized wave signal received is eager to excel
In vertically polarized wave 20dB or more, so, horizontal polarized wave signal will not be caused to do in same place vertically polarized wave signal
It disturbs；When carrying out reception wireless signal according to dual polarized antenna in the present invention, according to Fig. 5 and Fig. 7 simulation results, same
Horizontal polarization intensity of wave received by place is differed with vertical polarization intensity of wave is no more than 2dB, makes first wave conduit and second
Signal strength caused by hole of sewing in waveguide on any one waveguide all has good flat surface, contributes to MIMO
Technology is realized.
Embodiment two：
As shown in figure 9, the difference between this embodiment and the first embodiment lies in, set vertical polarization is sewed on first wave conduit 1
Hole group includes an oblique strip-shaped hole 8, the angled folder for θ in central axes of oblique strip-shaped hole 8 and the wide face in 1 front end of first wave conduit
Angle, and the midpoint of oblique strip-shaped hole 8 is arranged on the central axes of first wave conduit 1；8 structure of oblique strip-shaped hole of two adjacent groups
It is identical and symmetrical along the radial direction of second waveguide pipe 3.
It includes that multiple continuous types being continuously disposed on wave crest are sewed that set horizontal polarization, which sews hole group, on second waveguide pipe 3
Hole 9, i.e., be all provided with that there are one continuous types to sew hole 9 on each wave crest, and continuous type sews axis of the hole 9 along the wide face of second waveguide pipe 3
Line arranges；The shape that continuous type sews hole 9 includes ellipse, rectangle or circle etc., rectangular opening is used in the present embodiment, and continuous
The vertical center line that type sews hole 9 is consistent with the ripple direction of second waveguide pipe 3.
Oblique strip-shaped hole 8 or the long side length of rectangular opening be ranging from the present embodiment
Wherein, d indicates that oblique strip-shaped hole 8 or the long side length of rectangular opening, λ are wave in the wavelength of free space, λgFor waveguide wavelength, d
Value range be 5mm≤d≤25mm；Oblique strip-shaped hole 8 or rectangular opening are equipped with chamfering in the angle of long side and broadside,
The value range of angular radius R isC indicates the width edge length of oblique strip-shaped hole 8 or rectangular opening.
It is respectively equipped with a carrier cable 6 in the lower end of the upper end of first wave conduit 1 and second waveguide pipe 3, carrier cable 6 is by interior
To including wirerope 6a and wirerope sheath 6b successively outside, wirerope sheath 6b is connected as one with oversheath 5.Utilize oval metal waveguide
Good, the light-weight feature of curvature, by the way that carrier cable 6 is fastened on the installation sites such as tunnel wall, you can realize the present invention's
Convenient installation can be both fixed on the wall as leakage coaxial cable by suspender, also can be as rectangle leaky wave conduit one
Sample is laid in orbit, and mounting means is flexible, and easy for installation.
The present embodiment by vertical polarization by sewing unit and horizontal polarization sews unit respectively along oval metallic waveguide
Length direction be uniformly arranged on the wide face in front end of two oval metallic waveguides, make on any one oval metallic waveguide
It sews signal strength caused by hole and all has good flatness, the received field strength difference of 50% probability and 95% probability is less than
2dB is better adapted to the transmission of car-ground radio signal, meets the use demand of MIMO technology, meets the development of the communication technology
Trend.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that, still may be used
To modify to the technical solution recorded in previous embodiment, either which part or all technical features are equal
It replaces, and these modifications or replacements, the model for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (7)
1. a kind of ellipse with dual polarised radiation mould sews flexible waveguide, it is characterised in that：Including two ellipses disposed in parallel
Metallic waveguide, oval metallic waveguide use the bellows that embossing moulding process is formed, equal outside two oval metallic waveguides
It is arranged between oversheath and two oversheaths and is connected as one by dowel；It is described two ellipse metallic waveguides it is same
The vertical polarization that radiation vertically polarized wave is respectively provided on side end face sews unit and the water for radiation level polarized wave
Mean pole sews unit, and vertical polarization sews vertically polarized wave and level caused by unit and sews horizontal pole caused by unit
The field strength changed between wave differs 20dB or more；
It includes the evenly distributed vertical pole of multigroup length direction along oval metallic waveguide that the vertical polarization, which sews unit,
Hole group is sewed in change；If the pitch that two adjacent groups vertical polarization sews hole group is P, thenM is integer, and 1≤m≤10, λ
For wavelength of the electromagnetic wave under corresponding frequency of use in oval metal waveguide；It includes N number of along ellipse that every group of vertical polarization, which sews group,
The vertical polarization of circle metallic waveguide length direction setting sews hole, 1≤N≤10；
It includes the evenly distributed horizontal pole of multigroup length direction along oval metallic waveguide that the horizontal polarization, which sews unit,
Hole group is sewed in change, if the pitch that two adjacent groups horizontal polarization sews hole group is P ＇, thenM is integer, and 1≤m ＇
≤ 10, λ are wavelength of the electromagnetic wave under corresponding frequency of use in oval metal waveguide；It includes N ' that every group of vertical polarization, which sews group,
A vertical polarization along the setting of oval metallic waveguide length direction sews hole, 1≤N '≤10.
2. the ellipse according to claim 1 with dual polarised radiation mould sews flexible waveguide, it is characterised in that：If oval gold
The termination frequency for belonging to flexible waveguide is fstopIf the major diameter length of any of which ellipse metal waveguide tube chamber cross section is A,
Minor axis diameter length is B, then the value range of major diameter length is 25.5mm≤A≤108.5mm, and minor axis diameter length takes
It is worth ranging from 12.5mm≤B≤65.5mm, corresponding termination frequency fstopValue range be 2.5GHz≤fstop≤
11.7GHz。
3. the ellipse according to claim 2 with dual polarised radiation mould sews flexible waveguide, it is characterised in that：Described appoints
The value range of the major diameter length of one oval metal waveguide tube chamber cross section is 48.5mm≤A≤50.5mm, and short axle is straight
The value range of electrical path length is 27.5mm≤B≤30mm, corresponding termination frequency fstopValue range be 4.6GHz≤fstop
≤6.6GHz。
4. the ellipse according to claim 2 or 3 with dual polarised radiation mould sews flexible waveguide, it is characterised in that：If institute
It is wide face to state two wider side external surfaces of oval metallic waveguide, and two relatively narrow side external surfaces of oval metallic waveguide are leptoprosopy,
The wide face of two oval metallic waveguides is towards front and back setting, and vertical polarization sews unit and horizontal polarization sews unit difference
It is arranged on the wide face in the same side of two oval metallic waveguides.
5. the ellipse according to claim 4 with dual polarised radiation mould sews flexible waveguide, it is characterised in that：Described two
The set pass for sewing hole sews hole, " vertical bar type sews hole ", " eight " font using line-styled on a ellipse metallic waveguide
It sews hole or continuous type sews arbitrary two kinds in hole；
It is the lateral strip-shaped hole for being parallel to oval metallic waveguide length direction, line-styled leakage that the line-styled, which sews hole,
Hole is let out staggeredly to be successively set on up and down on the end face of corresponding oval metallic waveguide；
Described " eight " font sews oblique strip-shaped hole of the hole for the length direction of center line and oval metallic waveguide in angle theta,
Same group of oblique strip-shaped hole is mutually parallel, and is located at same with the bottom end of the oblique strip-shaped hole of group and is parallel to oval metal wave
On the straight line in catheter length direction, the oblique bar shaped pore structure of two adjacent groups it is identical and along the diameter of oval metal flexible waveguide to the left and right
Symmetrically；
It is the vertical strip-shaped hole perpendicular to oval metallic waveguide length direction, same group vertical that the vertical bar type, which sews hole,
The bottom end of strip-shaped hole is located at same and is parallel on the straight line of oval metallic waveguide length direction；
The continuous type is sewed hole and is arranged on the wave crest of oval metallic waveguide, and same group of continuous type sews hole difference
Setting is sewed with continuous type on the identical multiple continuous wave crests of hole number.
6. the ellipse according to claim 4 with dual polarised radiation mould sews flexible waveguide, it is characterised in that：The outer shield
It puts on equipped with the carrier cable for being parallel to oval metallic waveguide, carrier cable includes wirerope and wirerope sheath, steel successively from the inside to the outside
Cable sheath is connected as one with oversheath.
7. the ellipse according to claim 6 with dual polarised radiation mould sews flexible waveguide, it is characterised in that：The load
Rope is disposed over the lower section of the above and or below oversheath of oversheath.
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