CN102013540A - Leaky coaxial cable for radiating circular polarization waves in circumferential 260 DEG range - Google Patents
Leaky coaxial cable for radiating circular polarization waves in circumferential 260 DEG range Download PDFInfo
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- CN102013540A CN102013540A CN2010105827135A CN201010582713A CN102013540A CN 102013540 A CN102013540 A CN 102013540A CN 2010105827135 A CN2010105827135 A CN 2010105827135A CN 201010582713 A CN201010582713 A CN 201010582713A CN 102013540 A CN102013540 A CN 102013540A
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Abstract
The invention provides a leaky coaxial cable for radiating circular polarization waves in a circumferential 260 DEG range and relates to the field of electronic science and technology. The leaky coaxial cable is characterized in that: a periodic combined gap which consists of two tilted rectangular gaps and a rectangular gap perpendicular to the axis of the coaxial cable is formed on an outer conductor of the coaxial cable; and the tilting directions of the two tilted rectangular gaps are opposite and are distributed crosswise. The leaky coaxial cable solves the problem that leaky coaxial cables cannot radiate the circular polarization waves in a larger circumferential angle range in the prior art. The leaky coaxial cable can radiate the circular polarization waves of which the polaxis ratio is less than 3dB in the circumferential 260 DEG range, can be applied to public mobile communication systems in limited areas and can effectively reduce electric wave fading caused by polarization mismatch, so that the requirements on high communication quality and high transmission rate are met and the leaky coaxial cable has higher practical value.
Description
Technical field
The present invention relates to the Electronics Science and Technology field, the coaxial cable that is specifically related to slot on the outer conductor, i.e. leaky coaxial cable.
Background technology
In the radio communication in restricted clearance, comparing leaky coaxial cable with the discrete antenna can provide more uniform field intensity to cover.Therefore, along with improving constantly that radio communication quality and message transmission rate are required, leaky coaxial cable such as has been widely used in indoor, the subway station at the public mobile communication system located in recent years.Yet, traditional leaky coaxial cable is based on the design of perpendicular polarization radiation characteristic more, as splayed clearance leakage coaxial cable, L shaped clearance leakage coaxial cable and U-shaped clearance leakage coaxial cable etc., and the portable terminal in the public mobile communication system can not determine to remain perpendicular polarization, along with portable terminal user's position and posture change, very big variation may appear in its polarization characteristic.Owing to the polarization characteristic difference of the employed built-in aerial of different mobile terminal, single perpendicular polarization mode also is difficult to guarantee communication quality in addition.In the case, the polarization mismatch between leaky coaxial cable and portable terminal will cause serious radio wave fading, thereby greatly influence the reliability and the validity of communication system.
Based on above consideration, the leaky coaxial cable that employing has the circular polarization radiation characteristic is a kind of optimal selection as the fore device in the public mobile communication system in the confined area, the coverage mode of circularly polarised wave can effectively reduce the radio wave fading that causes owing to polarization mismatch, to satisfy the requirement of high communication quality and transmission rate.
In available data, the report of relevant leaky cable with circular polarization characteristics is actually rare, and can only be in circumferential 40～50 ° of angular regions the radiation circularly polarised wave, effective overlay area of having limited single leaky cable.
Summary of the invention
For solve leaky coaxial cable under the prior art can not be in big circumferentially angular range the problem of radiation circularly polarised wave, the present invention proposes a kind of can be in circumferential 260 ° of angular regions the leaky coaxial cable structure of radiation circularly polarised wave.
The technical solution adopted in the present invention:
The leaky coaxial cable of radiation circularly polarised wave in circumferential 260 ° of angular regions is specially and has periodically the combined slit of being made up of perpendicular to the rectangular aperture of this coaxial cable axis two inclined rectangular slits and on the outer conductor of coaxial cable; The incline direction in two inclined rectangular slits is opposite, becomes cross-distribution.
Described periodic cycle P determines according to following formula:
In the formula: λ
0Be the central task wavelength of leaky coaxial cable, ε
rRelative dielectric constant for dielectric between the internal and external conductor.
The length in described two inclined rectangular slits is l
1With width be w
1Be consistent, and the angle between the axial z direction of cable is θ, the angle of angle is identical, and the geometric center point A in two inclined rectangular slits and the axially spaced-apart between B are Δ z
1The length in inclined rectangular slit is l
1, width is w
1, the angle of inclination is θ and axially spaced-apart Δ z
1Determine by following formula:
By regulating the length l in two inclined rectangular slits
1, width w
1, angle of inclination w
1With axially spaced-apart Δ z
1Determine the vertical component of radiated wave and the size of horizontal component.
The length of described rectangular aperture perpendicular to this leaky coaxial cable axis is l
2With width be w
2Determine by following formula:
0.43α≤l
2≤0.62α；l
2≤2Δh-l
1sinθ+1.5；6≤w
2≤11；30≤α≤50；
In the formula: Δ h is perpendicular to the circumferential interval between the geometric center point in the geometric center point C of the rectangular aperture of this leaky coaxial cable axis and two inclined rectangular slits.
The geometric center point C of described rectangular aperture perpendicular to this leaky coaxial cable axis and be Δ z perpendicular to the axially spaced-apart between the line of z axle by crosspoint, two inclined rectangular slits
2And the Δ h that circumferentially is spaced apart between the geometric center point in the geometric center point C of horizontal rectangular aperture and two inclined rectangular slits determines in following scope:
30≤Δz
2≤50；19≤Δh≤26。
Can change phase difference between horizontal component and vertical component by regulating perpendicular to the size of the rectangular aperture of this leaky coaxial cable axis and position, thereby make the big or small basically identical of vertical component and horizontal component of radiated wave, and phase difference remains approximate 90 °, so radiated wave will present circular polarization characteristics.
Beneficial effect of the present invention: combined rectangular aperture leaky coaxial cable proposed by the invention can be in circumferential 260 ° of angular regions the radiation polarization axial ratio less than the circularly polarised wave of 3dB, than can only in circumferential 40～50 ° of scopes, having remarkable advantages by the leaky coaxial cable of radiation circularly polarised wave, can provide wider stable field intensity to cover for the public mobile communication in the multiple confined area, the radio wave fading that minimizing causes because of polarization mismatch, thereby improve the stability of communication system, and guarantee high data rate.Combined rectangular aperture leaky coaxial cable proposed by the invention has higher utility.
Description of drawings
The leaky coaxial cable structure of Fig. 1 radiation circularly polarised wave in circumferential 260 ° of angular regions.
Among the figure: z is the axial coordinate under the cylindrical-coordinate system.
The leaky coaxial cable generalized section of Fig. 2 radiation circularly polarised wave in circumferential 260 ° of angular regions.
Among the figure: φ is that circumferential coordinate under the cylindrical-coordinate system and ρ are the radial coordinate under the cylindrical-coordinate system.
The combined rectangular aperture structure of Fig. 3.
The coupling loss that the vertical φ component of Fig. 4 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions and horizontal z component are determined in distance leaky coaxial cable 2m position along the circumferential distribution of cable, concrete parameter is: slit cycle P=200mm, operating frequency f=900MHz, l
1=52.3mm, w
1=6mm, l
2=20.2mm, w
2=8mm, θ=16 °, Δ h=22.3mm, Δ z
1=30mm, Δ z
2=39.9mm.
Phase difference between the horizontal z component of Fig. 5 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions and vertical φ component in distance leaky coaxial cable 2m position along the circumferential distribution of cable, concrete same Fig. 4 of parameter.
The axial ratio of Fig. 6 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is at distance leaky coaxial cable 2m, and 4m and 6m position be along the circumferential distribution of leaky coaxial cable, concrete same Fig. 4 of parameter.
The axial ratio of Fig. 7 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is at distance leaky coaxial cable 2m, and 4m and 6m position be along the axial distribution of leaky coaxial cable, circumferential angle φ=0 °, concrete same Fig. 4 of parameter.
The axial ratio of Fig. 8 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is 0 ° in circumferential angle, 145 °, 245 ° and the axial distribution of 320 ° of direction upper edge leaky coaxial cables are 2m apart from the distance of leaky coaxial cable, concrete same Fig. 4 of parameter.
The coupling loss that the vertical φ component of Fig. 9 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions and horizontal z component are determined in distance leaky coaxial cable 2m position along the circumferential distribution of cable, concrete parameter is: slit cycle P=200mm, operating frequency f=900MHz, l
1=45.1mm, w
1=5.3mm, l
2=20.2mm, w
2=10mm, θ=23 °, Δ h=22.3mm, Δ z
1=32.4mm, Δ z
2=39.9mm.
Phase difference between the horizontal z component of Figure 10 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions and vertical φ component in distance leaky coaxial cable 2m position along the circumferential distribution of cable, concrete same Fig. 9 of parameter.
The axial ratio of Figure 11 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is at distance leaky coaxial cable 2m, and 4m and 6m position be along the circumferential distribution of leaky coaxial cable, concrete same Fig. 9 of parameter.
The axial ratio of Figure 12 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is at distance leaky coaxial cable 2m, and 4m and 6m position be along the axial distribution of leaky coaxial cable, circumferential angle φ=0 °, concrete same Fig. 9 of parameter.
The axial ratio of Figure 13 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is 0 ° in circumferential angle, 145 °, 245 ° and the axial distribution of 320 ° of direction upper edge leaky coaxial cables are 2m apart from the distance of leaky coaxial cable, concrete same Fig. 9 of parameter.
The coupling loss that the vertical φ component of Figure 14 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions and horizontal z component are determined in distance leaky coaxial cable 2m position along the circumferential distribution of cable, concrete parameter is: slit cycle P=200mm, operating frequency f=900MHz, l
1=62.2mm, w
1=7mm, l
2=21.3mm, w
2=10.6mm, θ=10 °, Δ h=22.3mm, Δ z
1=28mm, Δ z
2=39.9mm.
Phase difference between the horizontal z component of Figure 15 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions and vertical φ component in distance leaky coaxial cable 2m position along the circumferential distribution of cable, concrete same Figure 14 of parameter.
The axial ratio of Figure 16 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is at distance leaky coaxial cable 2m, and 4m and 6m position be along the circumferential distribution of leaky coaxial cable, concrete same Figure 14 of parameter.
The axial ratio of Figure 17 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is at distance leaky coaxial cable 2m, and 4m and 6m position be along the axial distribution of leaky coaxial cable, circumferential angle φ=0 °, concrete same Figure 14 of parameter.
The axial ratio of Figure 18 leaky coaxial cable radiation field of radiation circularly polarised wave in circumferential 260 ° of angular regions is 0 ° in circumferential angle, 145 °, 245 ° and the axial distribution of 320 ° of direction upper edge leaky coaxial cables are 2m apart from the distance of leaky coaxial cable, concrete same Figure 14 of parameter.
Embodiment
The invention will be further described in conjunction with the accompanying drawings.
Execution mode one, the leaky coaxial cable of radiation circularly polarised wave in circumferential 260 ° of angular regions that the present invention proposes is for as shown in Figure 1, 2.Concrete structure comprises dielectric 2, outer conductor 3 and the oversheath 4 between inner wire 1, inner wire and the outer conductor shown in the leaky coaxial cable generalized section of Fig. 2 radiation circularly polarised wave in circumferential 260 ° of angular regions, adopts existing leaky coaxial cable identical materials and method manufacturing.
Except that outer conductor 3, remainder adopts and other types leaky coaxial cable identical materials and method manufacturing.The present invention has the combined slit of periodically being made up of perpendicular to the rectangular aperture of this coaxial cable axis two inclined rectangular slits on the outer conductor 3 of above-mentioned coaxial cable; The incline direction in two inclined rectangular slits is opposite, becomes cross-distribution.Provided slit cycle P among Fig. 1, provided the axial coordinate z under the cylindrical-coordinate system among Fig. 1 and Fig. 2, circumferentially coordinate φ and radial coordinate ρ.After having determined the central task frequency of leaky coaxial cable, the numerical value of the slit cycle P of described leaky coaxial cable is to determine according to following formula:
λ in the formula
0For the central task wavelength of leaky coaxial cable, by formula
Determine, wherein f
0Be the central task frequency of leaky coaxial cable, c is an electromagnetic wave propagation speed in the free space, ε
rRelative dielectric constant for dielectric between the internal and external conductor 2.Selection principle for slit cycle P is: make the upper and lower limit of leaky coaxial cable working band all can satisfy above-mentioned formula requirement, promptly working band is positioned at the single mode radiation area.
Figure 3 shows that the combined rectangular aperture structure of opening on the outer conductor 3.In the combined rectangular aperture of being opened in each cycle, the geometric center point in two inclined rectangular slits is respectively A and B; The physical dimension in slit is identical, and length is l
1, width is w
1The angle of inclination in slit is identical, and the angle between the axial z direction of cable is θ, but incline direction is opposite; The geometric center point A in two inclined rectangular slits and the axially spaced-apart between B are Δ z
1Geometric center point perpendicular to the rectangular aperture of this leaky coaxial cable axis is C; The length in slit is l
2, width is w
2Perpendicular to the geometric center point C of the rectangular aperture of this leaky coaxial cable axis and be Δ z perpendicular to the axially spaced-apart between the line of z axle by crosspoint, two inclined rectangular slits
2Perpendicular to circumferentially being spaced apart Δ h between the geometric center point in the geometric center point C of the rectangular aperture of this leaky coaxial cable axis and two inclined rectangular slits.Combined rectangular aperture structural parameters are determined according to following steps:
1, according to the coupling loss scope of required leaky coaxial cable, the length l in described two inclined rectangular slits
1, width w
1And tilt angle theta is determined according to following formula:
3≤w
1≤9；10°≤θ≤25°；30≤α≤50；
Concrete definite principle is: if require the coupling loss of leaky coaxial cable less, and l then
1, w
1And θ all can be taken at the higher value in the formula scope.Wherein increase l
1Then the vertical component coupling loss of leaky coaxial cable and horizontal component coupling loss will be substantially by reducing in proportion; Then the changing down of vertical component coupling loss will be greater than the changing down of horizontal component coupling loss to increase θ; Increase w
1Then vertical component coupling loss and horizontal component coupling loss will reduce lessly.Otherwise, if require the coupling loss of leaky coaxial cable bigger, l then
1, w
1And θ all can be taken at the smaller value in the formula scope.Reduce l
1, w
1And the effect of θ is then with above-mentioned opposite.
2, the geometric center point A in described two inclined rectangular slits and the axially spaced-apart Δ z between B
1Determine according to following formula:
20≤Δz
1≤40
Concrete definite principle is: when increasing axially spaced-apart Δ z
1, the horizontal component of leaky coaxial cable radiated electric field reduces, and vertical component increases; Otherwise when reducing axially spaced-apart Δ z
1, the horizontal component of leaky coaxial cable spoke radiated electric field increases, and vertical component reduces.Therefore by regulating shaft to interval delta z
1Can be so that the vertical component of radiated electric field and horizontal component intensity be consistent substantially.
3, the length l of described rectangular aperture perpendicular to this leaky coaxial cable axis
2With width w
2Determine according to following formula:
0.43α≤l
2≤0.62α；l
2≤2Δh-l
1sinθ+1.5；6≤w
2≤11；30≤α≤50；
In the formula: Δ h is perpendicular to the circumferential interval between the geometric center point in the geometric center point C of the rectangular aperture of this leaky coaxial cable axis and two inclined rectangular slits.Concrete definite principle is: adjust l according to the size that inclined rectangular is analyzed
2And w
2, to guarantee to produce the electric field level component of suitable size.
4, the axially spaced-apart Δ z between the center line in the geometric center point C of described rectangular aperture perpendicular to this leaky coaxial cable axis and two inclined rectangular slits
2, and perpendicular to the circumferential interval delta h between the geometric center point in the geometric center point C of the rectangular aperture of this leaky coaxial cable axis and two inclined rectangular slits, determine according to following formula:
30≤Δz
2≤50；19≤Δh≤26；
Thereby the phase difference between the horizontal component between the radiation field of the horizontal component that changes the radiation field that the rectangular aperture perpendicular to this leaky coaxial cable axis produces and 2 inclined rectangular slit generations.Make the horizontal component and the phase difference between vertical component of the radiation field that total combination rectangular aperture produces remain 90 ° substantially.
Embodiment two, and choice structure is of a size of 1-5/8 " coaxial cable of model, inner wire 1 external diameter is 16mm, and outer conductor 3 internal diameters are 41.3m, and the dielectric constant of the dielectric 2 between inner wire and outer conductor is 1.26, and the dielectric constant of oversheath 4 is 2.3.
The operating frequency of leaky coaxial cable is set at 900MHz, and the slit cycle is according to formula
Be taken as P=200mm.The coupling loss that guarantees leaky coaxial cable is at 60～70dB, according to formula
3≤w
1≤ 9; 10 °≤θ≤25 °; L is selected in 30≤α≤50
1=52.3mm, w
1=6mm, θ=16 °, α=40.According to formula 20≤Δ z
1≤ 40, select Δ z
1=30mm.According to formula 0.43 α≤l
2≤ 0.62 α; l
2≤ 2 Δ h-l
1Sin θ+1.5; 6≤w
2≤ 11; L is selected in 30≤α≤50
2=20.2mm, w
2=8mm.At last, according to formula 30≤Δ z
2≤ 50; Δ z is selected in 19≤Δ h≤26
2=39.9mm, Δ h=22.3mm.
Figure 4 shows that coupling loss that the vertical φ component of combined rectangular aperture leaky coaxial cable radiation field and horizontal z component determine in distance leaky coaxial cable 2m position along the circumferential distribution of cable.In the whole circumferential 360 ° of scopes of leaky coaxial cable, the coupling loss of φ component and z component differs and is no more than 3dB substantially as seen from Figure 4.
Phase difference between the horizontal z component that Figure 5 shows that combined rectangular aperture leaky coaxial cable radiation field and vertical φ component in distance leaky coaxial cable 2m position along the circumferential distribution of cable.At leaky coaxial cable circumferential [0 °, 35 °], in [95 °, 145 °] and [180 °, 360 °] angular range, the phase difference of φ component and z component all is between [75 °, 105 °] as seen from Figure 5.
The axial ratio that Figure 6 shows that combined rectangular aperture leaky coaxial cable radiation field is at distance leaky coaxial cable 2m, and 4m and 6m position are along the circumferential distribution of leaky coaxial cable.As seen from Figure 6 at distance leaky coaxial cable 2m, 4m and 6m position, in totally 260 ° of angular ranges of circumferentially [0 °, 145 °] and [245 °, 360 °], the cable radiation field be the circularly polarised wave that defines less than 3dB with axial ratio.
The axial ratio that Figure 7 shows that combined rectangular aperture leaky coaxial cable radiation field is at distance leaky coaxial cable 2m, and 4m and 6m position be along the axial distribution of leaky coaxial cable, circumferentially angle φ=0 °.As seen from Figure 7 on ° direction of φ=0, apart from leaky coaxial cable different distance position, the axial ratio of radiation field along the fluctuation of cable axial distribution all less than 1dB.
The axial ratio that Figure 8 shows that combined rectangular aperture leaky coaxial cable radiation field is 0 ° in circumferential angle, and 145 °, 245 ° and the axial distribution of 320 ° of direction upper edge leaky coaxial cables are 2m apart from the distance of leaky coaxial cable.As seen from Figure 8 at 0 °, on 245 ° and the 320 ° of directions, the axial ratio of radiation field along the fluctuation of cable axial distribution all less than 1dB; On 145 ° of directions, the axial ratio of radiation field is about 2dB along the fluctuation of cable axial distribution, but average axial ratio is less than 3dB.
Embodiment three, and choice structure is of a size of 1-5/8 " coaxial cable of model, inner wire 1 external diameter is 16mm, and outer conductor 3 internal diameters are 41.3m, and the dielectric constant of the dielectric 2 between inner wire and outer conductor is 1.26, and the dielectric constant of oversheath 4 is 2.3.
The operating frequency of leaky coaxial cable is set at 900MHz, and the slit cycle is according to formula
Be taken as P=200mm.The coupling loss that guarantees leaky coaxial cable is at 60～70dB, according to formula
3≤w
1≤ 9; 10 °≤θ≤25 °; L is selected in 30≤α≤50
1=45.1mm, w
1=5.3mm, θ=23 °, α=50.According to formula 20≤Δ z
1≤ 40, select Δ z
1=32.4mm.According to formula 0.43 α≤l
2≤ 0.62 α; l
2≤ 2 Δ h-l
1Sin θ+1.5; 6≤w
2≤ 11; L is selected in 30≤α≤50
2=20.2mm, w
2=10mm.At last, according to formula 30≤Δ z
2≤ 50; Δ z is selected in 19≤Δ h≤26
2=39.9mm, Δ h=22.3mm.
Figure 9 shows that coupling loss that the vertical φ component of combined rectangular aperture leaky coaxial cable radiation field and horizontal z component determine in distance leaky coaxial cable 2m position along the circumferential distribution of cable.In the whole circumferential 360 ° of scopes of leaky coaxial cable, the coupling loss of φ component and z component differs and is no more than 3dB substantially as seen from Figure 9.
Phase difference between the horizontal z component that Figure 10 shows that combined rectangular aperture leaky coaxial cable radiation field and vertical φ component in distance leaky coaxial cable 2m position along the circumferential distribution of cable.In leaky coaxial cable circumferential [0 °, 200 °] and [290 °, 360 °] angular range, the phase difference of φ component and z component all is between [75 °, 105 °] as seen from Figure 10.
The axial ratio that Figure 11 shows that combined rectangular aperture leaky coaxial cable radiation field is at distance leaky coaxial cable 2m, and 4m and 6m position are along the circumferential distribution of leaky coaxial cable.As seen from Figure 11 at distance leaky coaxial cable 2m, 4m and 6m position, in totally 265 ° of angular ranges of circumferentially [0 °, 195 °] and [290 °, 360 °], the cable radiation field be the circularly polarised wave that defines less than 3dB with axial ratio.
The axial ratio that Figure 12 shows that combined rectangular aperture leaky coaxial cable radiation field is at distance leaky coaxial cable 2m, and 4m and 6m position be along the axial distribution of leaky coaxial cable, circumferentially angle φ=0 °.As seen from Figure 12 on ° direction of φ=0, apart from leaky coaxial cable different distance position, the axial ratio of radiation field along the fluctuation of cable axial distribution all less than 1dB.
The axial ratio that Figure 13 shows that combined rectangular aperture leaky coaxial cable radiation field is 0 ° in circumferential angle, and 165 °, 195 ° and the axial distribution of 290 ° of direction upper edge leaky coaxial cables are 2m apart from the distance of leaky coaxial cable.As seen from Figure 13 at 0 °, 165 °, on 195 ° and the 290 ° of directions, the axial ratio of radiation field along the fluctuation of cable axial distribution all less than 1dB.
Embodiment four, and choice structure is of a size of 1-5/8 " coaxial cable of model, inner wire 1 external diameter is 16mm, and outer conductor 3 internal diameters are 41.3m, and the dielectric constant of the dielectric 2 between inner wire and outer conductor is 1.26, and the dielectric constant of oversheath 4 is 2.3.
The operating frequency of leaky coaxial cable is set at 900MHz, and the slit cycle is according to formula
Be taken as P=200mm.The coupling loss that guarantees leaky coaxial cable is at 60～70dB, according to formula
3≤w
1≤ 9; 10 °≤θ≤25 °; L is selected in 30≤α≤50
1=62.2mm, w
1=7mm, θ=10 °, α=30.According to formula 20≤Δ z
1≤ 40, select Δ z
1=28mm.According to formula 0.43 α≤l
2≤ 0.62 α; l
2≤ 2 Δ h-l
1Sin θ+1.5; 6≤w
2≤ 11; L is selected in 30≤α≤50
2=21.3mm, w
2=10.6mm.At last, according to formula 30≤Δ z
2≤ 50; Δ z is selected in 19≤Δ h≤26
2=39.9mm, Δ h=22.3mm.
Figure 14 shows that coupling loss that the vertical φ component of combined rectangular aperture leaky coaxial cable radiation field and horizontal z component determine in distance leaky coaxial cable 2m position along the circumferential distribution of cable.In the whole circumferential 360 ° of scopes of leaky coaxial cable, the coupling loss of φ component and z component differs and is no more than 3dB substantially as seen from Figure 14.
Phase difference between the horizontal z component that Figure 15 shows that combined rectangular aperture leaky coaxial cable radiation field and vertical φ component in distance leaky coaxial cable 2m position along the circumferential distribution of cable.At leaky coaxial cable circumferential [0 °, 30 °], in [105 °, 145 °] and [170 °, 360 °] angular range, the phase difference of φ component and z component all is between [75 °, 105 °] as seen from Figure 15.
The axial ratio that Figure 16 shows that combined rectangular aperture leaky coaxial cable radiation field is at distance leaky coaxial cable 2m, and 4m and 6m position are along the circumferential distribution of leaky coaxial cable.As seen from Figure 16 at distance leaky coaxial cable 2m, 4m and 6m position, in totally 310 ° of angular ranges of circumferentially [0 °, 220 °] and [270 °, 360 °], the cable radiation field be the circularly polarised wave that defines less than 3dB with axial ratio.
The axial ratio that Figure 17 shows that combined rectangular aperture leaky coaxial cable radiation field is at distance leaky coaxial cable 2m, and 4m and 6m position be along the axial distribution of leaky coaxial cable, circumferentially angle φ=0 °.As seen from Figure 17 on ° direction of φ=0, apart from leaky coaxial cable different distance position, the axial ratio of radiation field along the fluctuation of cable axial distribution all less than 1dB.
The axial ratio that Figure 18 shows that combined rectangular aperture leaky coaxial cable radiation field is 0 ° in circumferential angle, and 220 °, 270 ° and the axial distribution of 335 ° of direction upper edge leaky coaxial cables are 2m apart from the distance of leaky coaxial cable.As seen from Figure 18 at 0 °, 220 °, on 270 ° and the 335 ° of directions, the axial ratio of radiation field along the fluctuation of cable axial distribution all less than 1dB.
Claims (6)
1. the leaky coaxial cable of radiation circularly polarised wave in circumferential 260 ° of angular regions, it is characterized in that, on the outer conductor (3) of coaxial cable, have periodically the combined slit of forming perpendicular to the rectangular aperture of this coaxial cable axis by two inclined rectangular slits and; The incline direction in two inclined rectangular slits is opposite, becomes cross-distribution.
2. according to claim 1 in circumferential 260 ° of angular regions the leaky coaxial cable of radiation circularly polarised wave, it is characterized in that its cycle of described periodicity P determines according to following formula:
In the formula: λ
0Be the central task wavelength of leaky coaxial cable, ε
rRelative dielectric constant for dielectric between the internal and external conductor (2).
3. according to claim 1 in circumferential 260 ° of angular regions the leaky coaxial cable of radiation circularly polarised wave, it is characterized in that the length in described two inclined rectangular slits is l
1With width be w
1Be consistent, and the angle between the axial z direction of cable is θ, the angle of angle is identical, and the geometric center point A in two inclined rectangular slits and the axially spaced-apart between B are Δ z
1The length in inclined rectangular slit is l
1, width is w
1, the angle of inclination is that θ and axially spaced-apart are Δ z
1Determine by following formula:
3≤w
1≤9；
10°≤θ≤25°；
20≤Δz
1≤40；
30≤α≤50。
4. according to claim 1 in circumferential 260 ° of angular regions the leaky coaxial cable of radiation circularly polarised wave, it is characterized in that the length of described rectangular aperture perpendicular to this leaky coaxial cable axis is l
2With width be w
2Determine by following formula:
0.43α≤l
2≤0.62α；
l
2≤2Δh-l
1sinθ+1.5；
6≤w
2≤11；
30≤α≤50；
In the formula: Δ h is perpendicular to the circumferential interval between the geometric center point in the geometric center point C of the rectangular aperture of this leaky coaxial cable axis and two inclined rectangular slits.
5. according to claim 1 in circumferential 260 ° of angular regions the leaky coaxial cable of radiation circularly polarised wave, it is characterized in that, perpendicular to the geometric center point C of the rectangular aperture of this leaky coaxial cable axis and be Δ z perpendicular to the axially spaced-apart between the line of z axle by crosspoint, two inclined rectangular slits
2And in following scope, determine perpendicular to the Δ h that circumferentially is spaced apart between the geometric center point in the geometric center point C of the rectangular aperture of this coaxial cable axis and two inclined rectangular slits:
30≤Δz
2≤50；
19≤Δh≤26。
6. according to claim 1 in circumferential 260 ° of angular regions the leaky coaxial cable of radiation circularly polarised wave, it is characterized in that each end points right angle in the combined slit of being opened on the outer conductor (3) is a circular arc chamfering.
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| CN 201010582713 CN102013540B (en) | 2010-12-10 | 2010-12-10 | Leaky coaxial cable for radiating circular polarization waves in circumferential 260 DEG range |
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| CN 201010582713 CN102013540B (en) | 2010-12-10 | 2010-12-10 | Leaky coaxial cable for radiating circular polarization waves in circumferential 260 DEG range |
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| CN102013540A true CN102013540A (en) | 2011-04-13 |
| CN102013540B CN102013540B (en) | 2013-01-23 |
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| CN 201010582713 Active CN102013540B (en) | 2010-12-10 | 2010-12-10 | Leaky coaxial cable for radiating circular polarization waves in circumferential 260 DEG range |
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Cited By (2)
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| WO2020103150A1 (en) * | 2018-11-23 | 2020-05-28 | 中天射频电缆有限公司 | Wide-angle radiation leaky coaxial cable |
| CN115458889A (en) * | 2022-09-21 | 2022-12-09 | 中通服咨询设计研究院有限公司 | Leaky cable with MIMO (multiple input multiple output) function |
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| WO2020103150A1 (en) * | 2018-11-23 | 2020-05-28 | 中天射频电缆有限公司 | Wide-angle radiation leaky coaxial cable |
| RU2753842C2 (en) * | 2018-11-23 | 2021-08-24 | Чжунтянь Рэдио Фриквенси Кейбл Ко., Лтд | Wide angle radiating cable |
| CN115458889A (en) * | 2022-09-21 | 2022-12-09 | 中通服咨询设计研究院有限公司 | Leaky cable with MIMO (multiple input multiple output) function |
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| CN102013540B (en) | 2013-01-23 |
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