CN113471707A - Ultra-wideband leaky coaxial cable designed by array source - Google Patents
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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
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Abstract
The invention discloses an ultra-wideband leaky coaxial cable designed by an array source, wherein an outer conductor of the cable is provided with array radiation units which are periodically arranged along the axial direction of the cable, one array radiation unit is arranged in one pitch period, each array radiation unit comprises two array radiation unit groove groups, the two array radiation unit groove groups in each array radiation unit are in axial symmetry distribution in one pitch period, each array radiation unit groove group comprises a plurality of basic array unit grooves, and the two basic unit grooves in each basic array unit groove are in central symmetry distribution. According to the invention, by designing the array radiation units, the leaky cable realizes excellent broadband performance so as to better support multi-system co-construction and sharing of the leaky cable for mobile communication, the use bandwidth of 4000MHz is provided at most, the transmission performance of a high-frequency band is excellent, the radiation performance of a low-frequency band is excellent, the target section length comprehensive loss difference of each frequency in the use frequency band is controlled within 5dB, and the MIMO application effect of the leaky cable is improved.
Description
Technical Field
The invention belongs to the technical field of leaky cables, and particularly relates to an ultra-wideband leaky coaxial cable designed by an array source.
Background
Underground tunnels, high-speed rail tunnels and the like are important indoor coverage scenes of public mobile communication, network coverage of the scenes is usually completed in a mode that leaky cables are laid along the tunnel wall to uniformly radiate wireless signals, the scenes are not affected by factors such as tunnel shapes, bending and gradients, and the coverage effect is good when 2G/3G/4G public mobile communication is adopted. Due to the fact that the bearing frequency of the 5G communication system is greatly improved, the loss of a communication link is further aggravated, and the problem of signal coverage of a subway tunnel and a high-speed rail tunnel is brought.
For the reconstruction project, the distance between the original communication supporting resources and the equipment is fixed. Compared with 4G communication, 5G communication has higher carrying frequency, larger signal transmission loss and space loss and poorer penetration capability, which means that the coverage radius of 5G equipment is smaller under the same output power. Because influenced by the operation, there are more restrictions in the engineering time and the construction place of transformation project, if can't satisfy former equipment interval, will bring huge difficulty for the construction of transformation project, still can increase extra supporting resource cost simultaneously, have hindered 5G upgrading construction.
For a new project, 2G/3G/4G/5G co-coverage and maximum sharing of matching resources are the best construction scheme, but in order to enable 2G/3G/4G/5G co-construction and sharing, the use frequency band of a 5G leaky cable needs to contain 700 MHz-3700 MHz, and in order to obtain ideal performance, the use frequency band is wider, the frequency span exceeds 3000MHz, the wavelength span difference of electromagnetic waves exceeds 5.2 times, and balancing the radiation of the electromagnetic waves of each frequency is a key difficulty. Meanwhile, in order to achieve maximum sharing, the equipment spacing needs to be compromised, that is, under the target coverage radius, the 5G leaky cable full-frequency comprehensive loss performance cannot have large deviation. To realize such a product, not only the problem of frequency extension of leaky cables needs to be solved, but also the problems of poor low-frequency radiation performance, poor high-frequency transmission performance and large high-frequency coupling fluctuation in a 3000MHz frequency bandwidth need to be overcome.
With the development of communication technology, the trend of high frequency evolution of communication is more and more obvious, besides the original system access, the access of a higher frequency system needs to be supported, and more application scenes favor leaky cables with wider use frequency bands, such as industrial WiFi 2.4GHz & WiFi 5.8GHz, civil 2G/3G/4G/5G, rail transit PDT, TETRA, CBTC, PIS, 5G-R, and the like, so that the leaky cable frequency extension technology becomes one of the key technologies of leaky cable products.
The Chinese invention patent, publication No. CN110707430A, discloses a wide high-frequency leaky cable, which comprises an inner conductor, an insulating layer, an outer conductor and a sheath which are coaxially nested from inside to outside in sequence, wherein the outer conductor is provided with a plurality of slot hole groups which are arranged periodically by taking a pitch P as the axial direction; the slotted hole group comprises a plurality of array groups which are staggered and overlapped along the axial direction; the array group comprises a left array and a right array, the left array and the right array are arranged along an axis in a splayed shape, and the inclination angles of the left array and the right array relative to the axis are complementary; the left array and the right array are symmetrical along a perpendicular bisector of a connecting line of the left array and the right array; the distance between the centers of the left array and the right array is P/2; the invention patent increases the low-frequency radiation performance and the high-frequency transmission performance, and controls the difference of the comprehensive loss in the use frequency band within 5dB according to the comprehensive loss evaluation of 250m, so that the invention is more suitable for being used in a 2G/3G/4G/5G combiner. However, the leaky cable is a symmetrical type chute array and is vertical to main polarization, when a plurality of cables are applied, the correlation among the cables is large, the MIMO effect of the leaky cable is influenced, the correlation with the working frequency band is too small, the broadband design basis is separated, and the length-width ratio of a rectangle is not specified, so that the design optimization of the 800-plus-3600 MHz radiating unit is lack of guidance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an ultra-wideband leaky coaxial cable designed by an array source.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
an ultra-wideband leaky coaxial cable designed by an array source comprises an inner conductor, an insulating layer, an outer conductor and a sheath which are sequentially arranged from inside to outside, wherein the outer conductor is provided with array radiation units which are periodically arranged along the axial direction of the cable, one array radiation unit is arranged in one pitch period P, each array radiation unit comprises two array radiation unit groove groups, the two array radiation unit groove groups in each array radiation unit are in axisymmetric distribution in one complete pitch period P, each array radiation unit groove group comprises a plurality of basic array unit grooves, each basic array unit groove comprises two basic unit grooves, the two basic unit grooves in each basic array unit groove are in centrosymmetric distribution, the shapes of all the basic unit grooves are uniform, and the included angles alpha between all the basic unit grooves and the axial line of the cable are the same.
Furthermore, the value range of an included angle alpha between the basic unit groove and the axis of the cable is 10-30 degrees or 60-90 degrees; when the included angle alpha between the basic unit groove and the cable axis is in the range of 10-30 degrees, the wireless signals excited by the array radiation unit are mainly vertically polarized, and when the included angle alpha between the basic unit groove and the cable axis is in the range of 60-90 degrees, the wireless signals excited by the array radiation unit are mainly horizontally polarized.
Further, the basic unit grooves are rectangular, triangular or quarter-circular and are respectively made of a rectangular mother plate, a rhombic mother plate or an oval mother plate.
Further, the basic unit groove is rectangular, and is prepared by the following steps:
the rectangular mother plate on the outer conductor is divided along the perpendicular bisector and equally divided into four unit grooves, wherein two unit grooves which are distributed along the diagonal direction and are centrosymmetric form two basic unit grooves, the two basic unit grooves are separated by a certain distance in the length direction, the groove width of the basic unit groove is half of the groove width of the rectangular mother plate, and the groove length of the basic unit groove is half of the groove length of the rectangular mother plate.
Further, the relationship between the distance D separating two basic unit grooves in each basic array unit groove in the length direction and the width W of the rectangular master groove satisfies the following condition:
further, the relationship between the rectangular master groove width W and the rectangular master groove length L satisfies the following condition:
further, the size of the rectangular master plate and the minimum frequency f of the used frequency bandminAnd maximum frequency fmaxIn relation to, from the center frequency fmidDetermining;
center frequency fmidThe calculation formula of (2) is as follows:
when the included angle alpha between the basic unit groove and the cable axis is in the range of 10-30 degrees, the length L and the central frequency f of the rectangular mother plate groovemidThe relationship of (a) satisfies the following condition:
wherein c is the speed of light, and epsilon is the equivalent relative dielectric constant of the cable insulation medium.
Further, the size of the rectangular master plate and the minimum frequency f of the used frequency bandminAnd maximum frequency fmaxIn relation to, from the center frequency fmidDetermining;
center frequency fmidThe calculation formula of (2) is as follows:
when the included angle alpha between the basic unit groove and the cable axis is in the range of 60-90 degrees, the length L of the rectangular mother plate groove and the central frequency fmidThe relationship of (a) satisfies the following condition:
wherein c is the speed of light, and epsilon is the equivalent relative dielectric constant of the cable insulation medium.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses an ultra-wideband leaky coaxial cable designed by an array source, which comprises an inner conductor and an insulating layer which are arranged from inside to outside in sequence, the cable comprises an outer conductor and a sheath, wherein the outer conductor is provided with array radiation units which are periodically arranged along the axial direction of the cable, one array radiation unit is arranged in one pitch period P, each array radiation unit comprises two array radiation unit groove groups, the two array radiation unit groove groups in each array radiation unit are axially symmetrically distributed in one complete pitch period P, each array radiation unit groove group comprises a plurality of basic array unit grooves, each basic array unit groove comprises two basic unit grooves, the two basic unit grooves in each basic array unit groove are centrally symmetrically distributed, the shapes of all the basic unit grooves are uniform, and the included angles alpha between all the basic unit grooves and the axial line of the cable are the same. The invention realizes excellent broadband performance of the leaky cable by designing the array radiation unit, better supports 2G/3G/4G/5G multi-system co-construction sharing of the leaky cable for mobile communication, can provide 4000MHz using bandwidth at most, has excellent broadband performance, focuses on high-frequency and low-frequency optimized design in the using frequency band, has excellent high-frequency band transmission performance and excellent low-frequency band radiation performance in the using frequency band by optimization, ensures uniform and stable comprehensive performance under each frequency, can further balance the transmission performance and the radiation performance of each frequency by structure fine tuning, ensures that the target segment length comprehensive loss difference of each frequency in the using frequency band is controlled within 5dB, better assists multi-system combiner application, provides horizontal main polarization and vertical main polarization, adopts symmetrical inclined distribution (inclined by 10-30 degrees) when designing the vertical main polarization, the vertical and approximately vertical distribution (inclination is 60-90 degrees) is adopted when the horizontal main polarization is designed, the leakage cable is suitable for the mainstream leakage cable specifications at the present stage, the leakage cable comprises 1/2 ', 3/4 ', 7/8 ', 5/4 ' and 13/8 ', two polarization leakage cables with similar performance can be designed, a multi-polarization mode combination scheme is provided for the leakage cable application project, the correlation among cables in multi-cable application is reduced, and the MIMO application effect of the leakage cable is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the fabrication of a cell of the basic unit of example 1 of the present invention;
fig. 3 is a schematic structural diagram of an array radiation unit according to embodiment 1 of the present invention;
FIGS. 4 to 5 are flow charts illustrating the fabrication of the basic cell well according to example 2 of the present invention
FIG. 6 is a schematic structural diagram of an array radiation unit according to the present invention; fig. 6a is a structural schematic diagram of an array radiation unit of embodiment 2, fig. 6b is a structural schematic diagram of an array radiation unit of embodiment 3, and fig. 6c is a structural schematic diagram of an array radiation unit of embodiment 4.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.
As shown in fig. 1-5, an ultra-wideband leaky coaxial cable designed by an array source comprises an inner conductor 1, an insulating layer 2, an outer conductor 3 and a sheath 4 which are sequentially arranged from inside to outside, wherein the outer conductor 3 is provided with array radiation units which are periodically arranged along the axial direction of the cable, an array radiation unit is arranged in a pitch period P, each array radiation unit comprises two array radiation unit groove sets, the two array radiation unit groove sets in each array radiation unit are axially symmetrically distributed in a complete pitch period P, the array radiation unit groove sets are sequentially arranged at a distance P/2, each array radiation unit groove set comprises a plurality of basic array unit grooves, the arrangement of the basic array unit grooves is arranged according to the harmonic radiation suppression principle, each basic array unit groove comprises two basic unit grooves 5, the two basic unit grooves 5 in each basic array unit groove are centrosymmetrically distributed, the central points of the connecting lines on the same side are rotated by 180 degrees to be completely overlapped, the shapes of all the basic unit grooves 5 are uniform, and the included angles alpha between all the basic unit grooves 5 and the axial line of the cable are the same.
The value range of an included angle alpha between the basic unit groove and the axis of the cable is 10-30 degrees or 60-90 degrees; when the included angle alpha between the basic unit groove and the cable axis is in the range of 10-30 degrees, the wireless signals excited by the array radiation units are vertically polarized, and when the included angle alpha between the basic unit groove and the cable axis is in the range of 60-90 degrees, the wireless signals excited by the array radiation units are horizontally polarized.
The basic unit grooves 5 are rectangular, triangular or quarter-circular and the like, and are flexibly selected according to actual requirements.
As a more specific embodiment, when the basic unit cell 5 has a rectangular shape, the basic unit cell 5 is prepared by the following steps:
the rectangular mother plate on the outer conductor 3 is divided along the perpendicular bisector and equally divided into four unit grooves, wherein two unit grooves which are distributed along the diagonal direction and are centrosymmetric form two basic unit grooves 5, the two basic unit grooves 5 are separated by a certain distance D in the length direction, the groove width of the basic unit groove 5 is half of the groove width of the rectangular mother plate, and the groove length of the basic unit groove 5 is half of the groove length of the rectangular mother plate.
The relation between the rectangular master plate groove width W and the rectangular master plate groove length L meets the following conditions:
using the minimum frequency f of a frequency bandminNot less than initial radiation frequency f of radiation type leaky cable0Using the maximum frequency f of the frequency bandmaxNot more than 7f0。fminAnd fmaxFor the lowest and highest operating frequencies of the access system, respectively, the frequency bands of the leaky cable are required to be used, for example, a 5G full-frequency leaky cable is required to support a frequency bandwidth of 3000MHz starting from 700MHz to 3700MHz, and some of the frequency bands are not available.
Initial radiation frequency f of radiation type leaky cable0The calculation formula of (2) is as follows:
center frequency fmidThe calculation formula of (2) is as follows:
when the included angle alpha between the basic unit groove and the cable axis is in the range of 10-30 degrees, the length L and the central frequency f of the rectangular mother plate groovemidThe relationship of (a) satisfies the following condition:
the best performance can be obtained by fine-tuning the value of the included angle alpha between the basic unit groove and the cable axis.
When the included angle alpha between the basic unit groove and the cable axis is in the range of 60-90 degrees, the length L of the rectangular mother plate groove and the central frequency fmidThe relationship of (a) satisfies the following condition:
wherein c is the speed of light, and epsilon is the equivalent relative dielectric constant of the cable insulation medium.
The basic unit grooves 5 are greatly deformed during process implementation, which results in performance deviation from design, so that in practical application, two basic unit grooves 5 in each basic array unit groove need to be separated by a certain distance D in the length direction, and the relationship between the separation distance D and the groove width W of the rectangular master plate meets the following condition:
example 1
A700-3700 MHz vertical polarization ultra-wideband leaky coaxial cable is designed to support 2G/3G/4G/5G co-construction sharing.
In order to radiate electromagnetic signals in a 700-3700 MHz frequency band, the applicable radiation frequency band is f according to the frequency characteristic of a four-eight structure0-7f0，f0The calculation formula of (2) is as follows:
wherein c is the speed of light, and epsilon is the equivalent relative dielectric constant of the cable insulation medium.
When the pitch period P is 190mm, calculating according to the equivalent relative dielectric constant epsilon of the cable insulation medium of 1.248, wherein the usable radiation frequency band is 745-5215 MHz;
when the pitch period P is 260mm, the applicable radiation frequency band is 540-3820 MHz, namely 190-260 mm can all satisfy the radiation requirement. However, due to the existence of resonant frequency and unavailable frequency of the radiation type leaky cable, the radiation type leaky cable needs to be designed in a non-civil communication frequency band (960-1710 MHz, 2025-2110 MHz, 2170-2300 MHz, 2400-2515 MHz and 2675-3300 MHz), and meanwhile, the radiation performance of high and low frequencies is balanced, in the embodiment, if epsilon is limited to 1.2-1.29, the value range of P can be divided into four sections, namely 190-196 mm, 215-221 mm, 235-245 mm and 255-265 mm.
In the embodiment, the pitch period P is the median of the fourth range, and P is 260 mm.
When the polarization mode requires vertical polarization, the included angle alpha between the basic unit groove and the cable axis is 25 degrees.
Center frequency fmidThe calculation formula of (2) is as follows:
namely:
assuming that the equivalent relative dielectric constant epsilon of the cable insulation medium is 1.235, the size of the rectangular master plate can be determined, and the slot length L and the central frequency f of the rectangular master platemidThe relationship of (a) satisfies the following condition:
namely:
namely:
30.68mm≤L≤34.1mm
the relation between the rectangular master plate groove width W and the rectangular master plate groove length L meets the following conditions:
taking the median value of the rectangular master groove length L as 32mm, the rectangular master groove width W is 6.4mm, the separation distance D is 1/2W is 3.2mm, the design flow of the basic unit grooves 5 is shown in fig. 2, and then the basic unit grooves 5 are arranged according to the harmonic suppression principle to form array radiation units, and 16 basic array unit grooves in total are shown in fig. 3.
For 8 radiating element of traditional four eight word structure, the radiating element quantity of this embodiment has increased one time, makes the stable stack of electromagnetic energy in the space kind through array source design, increases and stabilizes the radiation field. The high-frequency excessive radiation is restrained by reducing the size of the radiation unit, the low-frequency radiation capability is enhanced by array arrangement, the high-frequency radiation field is stabilized by offsetting the relative position of the arrays, and the radiation characteristic and the transmission characteristic of the leaky cable under different frequencies are balanced.
The shape of the slot can be finely adjusted, for example, four corners of a rectangle are led to form round corners or two corners on the outer side are led to form round corners, the diameter of a circle of each lead corner is W, punching die abrasion is not easily caused when a die is used for punching holes after the lead corners, the outer conductor 3 is easy to form when wrapped longitudinally, and the wrapping sheath is not easily deformed after forming.
The array radiating element size obtained according to the embodiment has the best comprehensive performance in the use frequency band, and the performance can be inclined to high frequency or low frequency according to actual requirements during specific design, and the general design with larger size is more favorable for low frequency, otherwise, the high frequency is better.
Example 2
A700-3700 MHz horizontal polarization leaky cable is designed to support 2G/3G/4G/5G co-construction sharing.
In order to radiate electromagnetic signals in a 700-3700 MHz frequency band, the applicable radiation frequency band is f according to the frequency characteristic of a four-eight structure0-7f0，f0The calculation formula of (2) is as follows:
wherein c is the speed of light, and epsilon is the equivalent relative dielectric constant of the cable insulation medium.
When the pitch period P is 190mm, calculating according to the equivalent relative dielectric constant epsilon of the cable insulation medium of 1.248, wherein the usable radiation frequency band is 745-5215 MHz;
when the pitch period P is 260mm, the applicable radiation frequency band is 540-3820 MHz, namely 190-260 mm can all satisfy the radiation requirement. However, due to the existence of resonant frequency and unavailable frequency of the radiation type leaky cable, the radiation type leaky cable needs to be designed in a non-civil communication frequency band (960-1710 MHz, 2025-2110 MHz, 2170-2300 MHz, 2400-2515 MHz and 2675-3300 MHz), and meanwhile, the radiation performance of high and low frequencies is balanced, in the embodiment, if epsilon is limited to 1.2-1.29, the value range of P can be divided into four sections, namely 190-196 mm, 215-221 mm, 235-245 mm and 255-265 mm.
In the embodiment, the pitch period P is the median of the fourth range, and P is 260 mm.
When the polarization mode requires vertical polarization, the included angle alpha between the basic unit groove and the cable axis is 90 degrees.
Assuming that the equivalent relative dielectric constant epsilon of the cable insulation medium is 1.235, the size of the rectangular master plate can be determined, and the rectangular master plate is rectangularMaster plate slot length L and center frequency fmidThe relationship of (a) satisfies the following condition:
namely:
namely:
21.69mm≤L≤24.11mm
the relation between the rectangular master plate groove width W and the rectangular master plate groove length L meets the following conditions:
taking the median value of the rectangular master slot length L as 24mm, the rectangular master slot width W is 4.8mm, the separation distance D is 1/2W is 2.4mm, the design flow of the basic unit slots 5 is shown in fig. 4-5, and then the basic unit slots 5 are arranged according to the harmonic suppression principle to form array radiation units, and 16 basic array unit slots in total are shown in fig. 6 a.
The same as in example 1.
Example 3
The present embodiment differs from embodiment 2 in that the rectangular master is replaced by a prismatic master, resulting in the array of radiating elements of fig. 6 b.
The same as in example 1.
Example 4
The present embodiment differs from embodiment 2 in that the rectangular master is replaced with an elliptical master, resulting in the array radiation unit of fig. 6 c.
The same as in example 1.
The parts of the invention not specifically described can be realized by adopting the prior art, and the details are not described herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. An ultra-wideband leaky coaxial cable designed by an array source comprises an inner conductor, an insulating layer, an outer conductor and a sheath which are arranged in sequence from inside to outside, the cable is characterized in that the outer conductor is provided with array radiation units which are periodically arranged along the axial direction of the cable, one array radiation unit is arranged in one pitch period, each array radiation unit comprises two array radiation unit groove groups, the two array radiation unit groove groups in each array radiation unit are axially symmetrically distributed in one complete pitch period, each array radiation unit groove group comprises a plurality of basic array unit grooves, each basic array unit groove comprises two basic unit grooves, the two basic unit grooves in each basic array unit groove are centrally symmetrically distributed, the shapes of all the basic unit grooves are uniform, and included angles between all the basic unit grooves and the axial line of the cable are the same.
2. The ultra-wideband leaky coaxial cable designed according to claim 1, wherein an included angle between the basic unit groove and a cable axis ranges from 10 ° to 30 ° or from 60 ° to 90 °; when the included angle between the basic unit groove and the cable axis is in the range of 10-30 degrees, the wireless signals excited by the array radiation unit are mainly vertically polarized, and when the included angle between the basic unit groove and the cable axis is in the range of 60-90 degrees, the wireless signals excited by the array radiation unit are mainly horizontally polarized.
3. The ultra-wide frequency leaky coaxial cable designed by the array source as claimed in claim 1, wherein said basic unit grooves are rectangular, triangular or quarter-circular, and are made of a rectangular mother plate, a rhombic mother plate or an elliptical mother plate, respectively.
4. The ultra-wide frequency leaky coaxial cable designed by the array source as claimed in claim 3, wherein said basic unit cell is rectangular, and said basic unit cell is prepared by the following steps:
the rectangular mother plate on the outer conductor is divided along the perpendicular bisector and equally divided into four unit grooves, wherein two unit grooves which are distributed along the diagonal direction and are centrosymmetric form two basic unit grooves, the two basic unit grooves are separated by a certain distance in the length direction, the groove width of the basic unit groove is half of the groove width of the rectangular mother plate, and the groove length of the basic unit groove is half of the groove length of the rectangular mother plate.
5. The array source designed ultra-wide frequency leaky coaxial cable as claimed in claim 4, wherein a relationship between a distance D separating two basic unit grooves in each basic array unit groove in a length direction and a width W of the rectangular master plate groove satisfies the following condition:
6. the array source designed ultra-wide frequency leaky coaxial cable as claimed in claim 4, wherein the relationship between the rectangular master plate slot width W and the rectangular master plate slot length L satisfies the following condition:
7. the ultra-wide frequency leaky coaxial cable designed by array source as claimed in claim 4, wherein the rectangular master plate size and the minimum frequency f of the used frequency bandminAnd maximum frequency fmaxIn relation to, from the center frequency fmidDetermining;
center frequency fmidThe calculation formula of (2) is as follows:
when the included angle between the basic unit groove and the cable axis is in the range of 10-30 degrees, the length L and the central frequency f of the rectangular mother plate groovemidThe relationship of (a) satisfies the following condition:
wherein c is the speed of light, and epsilon is the equivalent relative dielectric constant of the cable insulation medium.
8. The ultra-wide frequency leaky coaxial cable designed by array source as claimed in claim 4, wherein the rectangular master plate size and the minimum frequency f of the used frequency bandminAnd maximum frequency fmaxIn relation to, from the center frequency fmidDetermining;
center frequency fmidThe calculation formula of (2) is as follows:
when the included angle between the basic unit groove and the cable axis is in the range of 60-90 degrees, the length L of the rectangular mother plate groove and the central frequency fmidThe relationship of (a) satisfies the following condition:
wherein c is the speed of light, and epsilon is the equivalent relative dielectric constant of the cable insulation medium.
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| CN116015369A (en) * | 2022-12-13 | 2023-04-25 | 长飞光纤光缆股份有限公司 | Dual-polarized leaky cable system for track 5GMIMO communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116015369A (en) * | 2022-12-13 | 2023-04-25 | 长飞光纤光缆股份有限公司 | Dual-polarized leaky cable system for track 5GMIMO communication |
| CN116015369B (en) * | 2022-12-13 | 2024-01-05 | 长飞光纤光缆股份有限公司 | Dual-polarized leaky cable system for track 5G MIMO communication |
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