CN114421168A - Leakage coaxial cable - Google Patents
Leakage coaxial cable Download PDFInfo
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- CN114421168A CN114421168A CN202210105733.6A CN202210105733A CN114421168A CN 114421168 A CN114421168 A CN 114421168A CN 202210105733 A CN202210105733 A CN 202210105733A CN 114421168 A CN114421168 A CN 114421168A
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- slotted hole
- cable
- coaxial cable
- slotted
- outer conductor
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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
- H01Q13/203—Leaky coaxial lines
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Abstract
A leaky coaxial cable is characterized in that double rows of slotted hole groups are arranged on an outer conductor along the axial direction of the cable, the centers of the double rows of slotted hole groups coincide with the central axis of the cable, each row of slotted hole groups comprises a plurality of slotted hole arrays which are periodically arranged along the axial direction of the outer conductor, the pitches P of the slotted hole arrays are the same and are selected according to the use frequency, the gain generated by the double rows of slotted hole groups is G to meet the requirement, the coupling loss can be reduced, meanwhile, the radiation direction is controlled by adjusting the slotted angle alpha, the energy is concentrated in the receiving direction, the effective field intensity is increased, the waste of invalid energy is reduced, the use distance of the cable is increased, and the construction cost is reduced.
Description
Technical Field
The invention belongs to the technical field of communication cable manufacture, and particularly relates to a leaky coaxial cable.
Background
With the advance of wireless communication technology, the use frequency is continuously improved, the higher the use frequency is, the larger the transmission attenuation of signals in the leaky coaxial cable serving as a transmission channel is, the shorter the used section length of the leaky coaxial cable is, the more intermediate equipment is, the larger the construction work amount is, the higher the construction cost is, the stronger the attenuation is compared with 2700MHz and 3700MHz, and by 110 plus 120%, how to reduce the attenuation and increase the radiation intensity is to enable the leaky coaxial cable to exert the advantages of the leaky coaxial cable and overcome the defects of the leaky coaxial cable to the greatest extent becomes a research target in the industry, the lower attenuation of the slot type is adjusted, the gain of the slot type is increased, the radiation intensity is enhanced, and the construction cost is reduced.
The utility model discloses a utility model with publication number CN214898881U discloses a multi-direction radiation leakage coaxial cable, its technical scheme main points include from inside to outside coaxial nested inner conductor in proper order, the insulating layer, outer conductor and sheath, outer conductor is last to have seted up two at least slotted hole groups, two at least slotted hole groups distribute on the different angles of outer conductor circumferencial direction, every slotted hole group includes a plurality of slotted hole arrays along outer conductor axial periodic arrangement, every slotted hole array includes a plurality of slotted holes, the pitch of every slotted hole group is the same, the periodic arrangement of two adjacent slotted hole groups in the circumferencial direction differs half pitch, make the phase difference of individual excitation electric field 180, though it is through setting up multiseriate slotted hole group, and make two adjacent slotted hole groups in the circumferencial direction differ half pitch, make the phase difference of excitation electric field 180, can realize source separation in space, make between the excitation source mutually independent, The leakage cables are not interfered with each other, so that the number of radiation directions of all frequency points in the working frequency band of the leakage cables can be increased, the leakage cables have stronger application scene applicability, and detailed introduction of the leakage cables on the specific arrangement of the slotted holes is not detailed.
The utility model patent of publication No. CN206451519U discloses a bending-resistant broadband radiation type leaky coaxial cable, which comprises an inner conductor extending along the axial direction, and an insulator, an outer conductor and an outer sheath which are arranged outside the inner conductor in sequence from inside to outside; the inner conductor is a spiral corrugated copper pipe; the outer conductor is tightly coated on the insulator, is provided with a groove hole periodically along the axial direction, and is provided with a roller grain with a V-shaped cross section on the outer surface; although the leaky coaxial cable is wider in applicable frequency band, the copper strip serving as the outer conductor is continuous, uniform and free of defects, controlled electromagnetic wave energy can be uniformly radiated out and received in along a line, the outer surface of the outer conductor is pressed into V-shaped roll marks through roll mark equipment, the slotted holes are arranged in multiple groups at equal intervals, each group comprises two slotted holes which are correspondingly arranged, the two slotted holes form a splayed structure, and the problems that the leaky coaxial cable is short in transmission distance and the tail end signal is weak under high-frequency signal transmission cannot be solved.
Disclosure of Invention
The invention aims to provide a leaky coaxial cable aiming at the defects of the prior art, and solves the problems that a gain type design mode under high frequency is adopted, the radiation intensity of a product is increased, and the transmission distance of the leaky coaxial cable under high-frequency signal transmission is short and a tail end signal is weak.
In order to solve the technical problems, the invention adopts the technical scheme that:
a leaky coaxial cable comprises an inner conductor, an insulating layer, an outer conductor and an outer protective layer in sequence from inside to outside, wherein the inner conductor is an annular copper pipe, double rows of slotted hole groups are distributed on the outer conductor along the axial direction of the cable, the centers of the double rows of slotted hole groups are superposed with the central axis of the cable, each row of slotted hole groups comprises a plurality of slotted hole arrays which are periodically arranged along the axial direction of the outer conductor, the pitches p of the slotted hole arrays are the same and meet the following formula,
wherein f is1For minimum frequency of cable use, f2For maximum frequency of use of the cable, epsilonrIs the equivalent relative dielectric constant of the insulating medium in the cable, and c is the speed of light, i.e. 3 x 108m/s；
Each slotted hole array comprises a plurality of slotted holes which are arranged at intervals, and the length of the slot of each slotted hole is L, so that the requirement of arranging the slotted holes at intervals is met
L＝(R×λ)1/2；
Where R is the radiation distance, λ is the transmission wavelength, and λ is 3 × 108F, f is the cable use frequency;
the vertical distance between the starting end and the tail end of the two rows of slots corresponding to the slot holes is S, and
S＝L-2*L×sinα；
wherein the groove angle alpha is an included angle between the center of the groove hole and the center line of the outer conductor, and the range of the alpha is 0-180 degrees. Meanwhile, the included angle alpha between the center of the slot hole and the center line of the outer conductor and the radiation power satisfy the following relational expression:
Pr＝Pincos2α，
wherein, PrTo the radiation power, PinIn order to emit signal power, the radiation direction of the signal can be controlled by controlling the included angle α, and the phase difference Δ α is 2 pi p (cos α)/λ, and the radiation intensity and radiation direction can be controlled by the variation of the slot angle and the phase difference Δ α.
The gain generated by the double-row slotted hole group is G, and
G＝4πLηa/λ2，
wherein, the transmission wavelength lambda is 3 multiplied by 108F, f is the frequency of use; etaaTo influence the gain factor.
The alpha satisfies
Where f (x) is the distribution function of the current on the cable and μ -1/2 kpsin α, k is the wave number 2 π/λ.
The slotted hole is a rectangular slotted hole.
The inner conductor adopts a copper strip to weld a spiral copper pipe, and the wave crest size of the spiral copper pipe is 17.5-18.2 mm;
the insulating layer is wrapped on the inner conductor by adopting nitrogen or carbon dioxide foamed polyethylene;
the outer conductor is longitudinally wrapped on the insulating layer by adopting two rows of grooved embossed or smooth copper strips.
The diameter of the insulating layer is 42.5mm-44.5mm, and the relative dielectric constant epsilonrIs 2.4-2.18.
The outer protective layer is made of polyolefin or polyethylene material.
And 2-8 slotted holes are arranged in each slotted hole array.
The invention has the beneficial effects that:
(1) according to the leaky coaxial cable, double rows of slotted hole groups are distributed on an outer conductor along the axial direction of the cable, the centers of the double rows of slotted hole groups coincide with the central axis of the cable, each row of slotted hole groups comprises a plurality of slotted hole arrays which are periodically arranged along the axial direction of the outer conductor, the pitches P of the slotted hole arrays are the same and are selected according to the use frequency, the gain generated by the double rows of slotted hole groups is G to meet the requirement, the coupling loss can be reduced, meanwhile, the radiation direction is controlled by adjusting the slotted angle alpha, the energy is concentrated in the receiving direction, the effective field intensity is increased, the waste of invalid energy is reduced, the use distance of the cable is increased, and the construction cost is reduced.
(2) The radiation intensity and the radiation direction are controlled by the change of the groove type angle and the phase difference.
(3) Through the design of gain type double-row slot hole group, the attenuation is reduced, the gain of the slot type is increased, the radiation intensity is enhanced, the construction cost is reduced, and the electric index of the leaky cable is effectively improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial schematic view of a slot set;
FIG. 3 is a schematic diagram of the radiation direction versus the trough angle α.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The present invention provides a leaky coaxial cable, as shown in fig. 1 to 3.
The leaky coaxial cable sequentially comprises an inner conductor 1, an insulating layer 2, an outer conductor 3 and an outer protective layer 4 from inside to outside, wherein the inner conductor 1 is an annular copper pipe, double rows of slotted hole groups 31 are distributed on the outer conductor 3 along the axial direction of the cable, the centers of the double rows of slotted hole groups 31 are superposed with the central axis of the cable, each row of slotted hole groups comprises a plurality of slotted hole arrays which are periodically arranged along the axial direction of the outer conductor, the pitch P of each slotted hole array is the same and meets the following formula, and the leaky coaxial cable is selected according to the use frequency.
Wherein f is1For minimum frequency of cable use, f2For maximum frequency of use of the cable, epsilonrIs the equivalent relative dielectric constant of the insulating medium in the cable, and c is the speed of light, i.e. 3 x 108m/s；
Each slotted hole array comprises a plurality of slotted holes which are arranged at intervals, in the embodiment, the slotted holes are rectangular slotted holes, and the gap length of the slotted holes is L, so that the requirement of arranging the slotted holes at intervals is met
L＝(R×λ)1/2；
Where R is the radiation distance, λ is the transmission wavelength, and λ is 3 × 108F, f is the cable use frequency;
the vertical distance between the starting end and the tail end of the two rows of slots corresponding to the slot holes is S, and
S＝L-2*L×sinα；
wherein alpha is an included angle between the center of the slotted hole and the center line of the outer conductor, and the range of alpha is 0-180 degrees; and alpha satisfies
Where f (x) is the distribution function of the current on the cable, μ -1/2 kpsin α, and k is the wave number 2 π/λ.
Meanwhile, the included angle alpha between the center of the slot hole and the center line of the outer conductor and the radiation power satisfy the following relational expression:
Pr＝Pincos2α，
wherein, PrTo the radiation power, PinIn order to transmit signal power, the radiation direction of the signal can be controlled by controlling an included angle alpha, the phase difference delta alpha is 2 pi p (cos alpha)/lambda, the radiation intensity and the radiation direction can be controlled by the change of the groove angle and the phase difference delta alpha, and the radiation direction is controlled by adjusting the groove angle alpha, so that energy is concentrated in the receiving direction to increase the effective field intensityThe waste of ineffective energy is reduced, the service distance of the cable is increased, and the construction cost is reduced. The gain generated by the double-row slotted hole group is G, and
G＝4πAηa/λ2，
wherein, the transmission wavelength lambda is 3 multiplied by 108F, f is the frequency of use; etaaTo affect gain factors such as loss of illumination, aperture occlusion, loss of depolarization, etc.
The inner conductor adopts a copper strip to weld a spiral copper pipe, and the wave crest size of the spiral copper pipe is 17.5-18.2 mm; the insulating layer is wrapped on the inner conductor by adopting nitrogen or carbon dioxide foamed polyethylene, the diameter of the insulating layer is 42.5mm-44.5mm, and the relative dielectric constant epsilonr2.4-2.18; the outer conductor is longitudinally wrapped on the insulating layer by adopting two rows of grooved embossed or smooth copper strips, and the outer protective layer is made of polyolefin or polyethylene material.
The slotted holes of each slotted hole array are 2-8, the number of the two rows of slotted holes is 4-16, the slotted holes are just opposite to the use frequency band, the upper row and the lower row of the outer conductor of the cable are slotted, the output of energy is controlled by continuous slotting, the coupling loss is reduced, the transmission loss is reduced, the radiation angle of signals is increased, the energy waste is reduced, the use distance of the cable is increased, the engineering cost is reduced, the attenuation is reduced, the gain of the slotted holes is increased, the radiation intensity is enhanced, the engineering cost is reduced, and the electrical index of a leaky cable is effectively improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "center", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the scope of the present invention.
Claims (8)
1. The utility model provides a leakage coaxial cable, from interior to exterior includes inner conductor, insulating layer, outer conductor and outside protective layer in proper order, and the inner conductor is annular copper pipe, its characterized in that: the outer conductor is provided with double rows of slotted hole groups along the axial direction of the cable, the centers of the double rows of slotted hole groups are superposed with the central axis of the cable, each row of slotted hole groups comprises a plurality of slotted hole arrays which are periodically arranged along the axial direction of the outer conductor, the pitches P of the slotted hole arrays are the same and satisfy the following formula,
wherein f is1For minimum frequency of cable use, f2For maximum frequency of use of the cable, epsilonrIs the equivalent relative dielectric constant of the insulating medium in the cable, and c is the speed of light, i.e. 3 x 108m/s；
Each slotted hole array comprises a plurality of slotted holes which are arranged at intervals, and the length of the slot of each slotted hole is L, so that the requirement of arranging the slotted holes at intervals is met
L＝(R×λ)1/2；
Where R is the radiation distance, λ is the transmission wavelength, and λ is 3 × 108F, f is the cable use frequency;
the vertical distance between the starting end and the tail end of the two rows of slots corresponding to the slot holes is S, and
S＝L-2*L×sinα；
wherein alpha is the included angle between the center of the slotted hole and the center line of the outer conductor, and the range of alpha is 0-180 degrees.
2. A leaky coaxial cable as claimed in claim 1, wherein: the gain generated by the double-row slotted hole group is G, and
G＝4πLηa/λ2，
wherein, the transmission wavelength lambda is 3 multiplied by 108F, f is the frequency of use; etaaTo influence the gain factor.
3. A leaky coaxial cable as claimed in claim 1, wherein: the alpha satisfies
Where f (x) is the distribution function of the current on the cable and μ -1/2 kpsin α, k is the wave number 2 π/λ.
4. A leaky coaxial cable as claimed in claim 1, wherein: the slotted hole is a rectangular slotted hole.
5. A leaky coaxial cable as claimed in claim 1, wherein: the inner conductor adopts a copper strip to weld a spiral copper pipe, and the wave crest size of the spiral copper pipe is 17.5-18.2 mm;
the insulating layer is wrapped on the inner conductor by adopting nitrogen or carbon dioxide foamed polyethylene;
the outer conductor is longitudinally wrapped on the insulating layer by adopting two rows of grooved embossed or smooth copper strips.
6. A leaky coaxial cable as claimed in claim 1, wherein: the diameter of the insulating layer is 42.5mm-44.5mm, and the relative dielectric constant epsilonrIs 2.4-2.18.
7. A leaky coaxial cable as claimed in claim 1, wherein: the outer protective layer is made of polyolefin or polyethylene material.
8. A leaky coaxial cable as claimed in claim 1, wherein: and 2-8 slotted holes are arranged in each slotted hole array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210105733.6A CN114421168A (en) | 2022-01-27 | 2022-01-27 | Leakage coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210105733.6A CN114421168A (en) | 2022-01-27 | 2022-01-27 | Leakage coaxial cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114421168A true CN114421168A (en) | 2022-04-29 |
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ID=81279712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210105733.6A Pending CN114421168A (en) | 2022-01-27 | 2022-01-27 | Leakage coaxial cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114421168A (en) |
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2022
- 2022-01-27 CN CN202210105733.6A patent/CN114421168A/en active Pending
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