CN113569426A - Leaky cable simulation design and analysis method, system, equipment and storage medium - Google Patents
Leaky cable simulation design and analysis method, system, equipment and storage medium Download PDFInfo
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Abstract
The invention provides a leaky cable simulation design and analysis method, a system, equipment and a storage medium, wherein the method comprises the following steps: creating a leaky cable model, and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model; setting ideal electric boundaries on two arms of the antenna, setting a radiation boundary on the surface of the air bin, and exciting at two ports of the leaky cable and the antenna setting port; setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting; checking and judging, and if the parameters are complete and correct, performing simulation analysis; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist. The method can accurately simulate and analyze the coupling loss and attenuation constant of each frequency of the leaky cable, compare and analyze with an actual test value, can quickly realize slotted hole improvement and optimization, and determines the size and the structure of a slotted hole with better product performance, thereby improving the research and development efficiency and quality and reducing the research and development cost.
Description
Technical Field
The invention belongs to the field of leaky cable simulation analysis, and particularly relates to a leaky cable simulation design and analysis method, a leaky cable simulation design and analysis system, leaky cable simulation equipment and a storage medium.
Background
The leaky coaxial cable has the characteristics of uniform and stable wireless signal coverage, and can achieve high-speed, stable and safe signal guarantee that antenna coverage cannot meet the requirements in a specific scene. In order to reduce investment and construction cost and realize 'co-construction sharing', a leaky coaxial cable is laid to transmit signals of all systems of 2G, 3G, 4G and 5G, and the problem of synchronous coverage and transmission of signals compatible with 700MHz-3700MHz frequency 5G is solved.
The outer conductor of the leaky coaxial cable is provided with periodic gaps, each gap is a reflection point for energy transmission, for the periodic reflection, when the distance between adjacent reflection points meets a certain relation, the cable generates resonance at the frequency, namely, electric energy generates back and forth oscillation at the frequency, and a standing wave peak value and an attenuation peak value are generated. During leaky cable design and analysis, it is big that structure, fluting hole interval, angle, groove length, groove width get influence to standing wave value, attenuation value and coupling loss, need process different shapes outer conductor slotted hole and verify, simultaneously to the leaky cable test back of production, can't confirm more can the optimization performance after groove length, angle, groove interval improve to increase research and development cost, influence research and development progress and quality simultaneously. Therefore, a fast leaky cable simulation analysis method is needed.
The patent number CN201910584096.3 relates to a flexible cable simulation analysis method under a virtual reality platform, and the invention discloses a flexible cable simulation analysis method under a virtual reality platform, which comprises the following specific steps: the method comprises the steps of building a flexible cable simulation analysis system, defining an electrical node by an electrical design module, designing a cable structure model by a structure design module, creating a cable simulation analysis model by a flexible cable setting module, setting cable attributes by the flexible cable setting module, setting motion simulation boundary conditions by the motion simulation analysis module, carrying out flexible cable motion simulation by the motion simulation analysis module, optimizing cable wiring by the flexible cable simulation module, analyzing environmental factor influence by the motion simulation analysis module, and outputting a simulation result and a file record. The method solves the problems of cable design and flexible simulation, can realize the optimal design of the cable length and the assembly process, and effectively reduces the scheme repetition in the equipment development process. However, when a flexible cable simulation analysis method under a virtual reality platform is used, a rigid CAD design model cannot meet the simulation analysis requirements when a product relates to cable assembly and movement, and the virtual reality technology can be based on the existing assembly process analysis method and carries out flexible modeling aiming at the characteristics of a cable network. The analysis rule of the cable network assembly space is established through the cable analysis simulation platform, dynamic simulation is developed according to the analysis rule, and the assembly method, the assembly sequence and the assembly process of the cable on the missile are analyzed, so that the problems are positioned and solved more quickly. However, the method relates to the field of simulation analysis methods for flexible cables, and mainly aims to quickly locate and solve the problems, so that simulation analysis cannot be performed on attenuation constants and coupling losses of leaky cables at different frequencies in an electromagnetic field.
The patent number CN201810892588.4 relates to a wide-band ultra-soft leaky coaxial cable, the invention provides a wide-band ultra-soft leaky coaxial cable, which supports the use frequency band of 800 MHz-3600 MHz, meets the use requirements of 5G systems, provides convenience for sharing multiple systems by wider use frequency band, and solves the problems of spread spectrum of multi-frequency point multi-system access, difference of high-frequency and low-frequency single-side coverage distances, interference of multiple signals in the same row, crosstalk and signal deterioration caused by dense wiring when one leaky cable is shared by multi-system combining. The composite insulation layer comprises a sheath, an outer conductor and an insulation layer, wherein the sheath is circular-ring-shaped in cross section and sequentially arranged from outside to inside, the inner conductor is arranged in an inner cavity of the insulation layer, at least two groups of slotted hole groups are periodically arranged in one radial region of the outer conductor along the length direction, each slotted hole group comprises at least two different slotted hole parameters, and the slotted hole parameters specifically include but are not limited to slotted hole shapes, gradual change pitches, slot widths, slot lengths, slot inclination angles, hole opening intervals and combined slotted hole patterns. The adopted technical scheme has the following defects:
the slot arrangement of the first embodiment: it is a four-eight character slotted hole, and the four-eight character slot structure is an unequal distance structure. Each 8 slotted holes are of a periodic structure to form a slotted hole group; in two adjacent slot groups, the pitch P between two corresponding slots is 160 mm-220 mm. In group A, the distance D1 between the first slot and the second slot is P/10, the distance D2 between the second slot and the third slot is P/15, and the distance D3 between the third slot and the fourth slot is P/10. The distance D4 between the first slot in group A and the first slot in group B is P/2. The length L1 of the slot is between 16mm and 22mm, and the lengths of 8 slots are slightly different. The included angle a between the front 4 parallel slotted holes and the cable axis in each pitch is 20-30 degrees, the included angle b between the rear 4 parallel slotted holes and the cable axis is 150-160 degrees, and the included angle a is complementary with the included angle b. The non-equidistant slots are beneficial to inhibiting harmonic waves, and the coupling loss and attenuation of the leaky cable reach an ideal balance point by fine-tuning the distance between the slots, so that the optimal electrical performance is obtained. The method provides a slot hole size range, has more combinations, can determine the size of the slot hole after voltage standing wave ratio, coupling loss and attenuation tests after different pitches, angles and slot lengths are produced and trial-manufactured, not only increases the research and development cost, but also reduces the research and development efficiency by repeated verification in performance analysis.
Disclosure of Invention
The invention aims to provide a leaky cable simulation design and analysis method, a leaky cable simulation design and analysis system, leaky cable simulation equipment and a storage medium. The method can accurately simulate and analyze the coupling loss and attenuation constant of each frequency of the leaky cable, compare and analyze with an actual test value, can quickly realize slotted hole improvement and optimization, and determines the size and the structure of a slotted hole with better product performance, thereby improving the research and development efficiency and quality and reducing the research and development cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a leaky cable simulation design and analysis method comprises the following steps:
creating a leaky cable model, and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
setting ideal electric boundaries on two arms of the antenna, setting a radiation boundary on the surface of the air bin, and exciting at two ports of the leaky cable and the antenna setting port;
setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
checking and judging, and if the parameters are complete and correct, performing simulation analysis; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
As a further improvement of the present invention, the creating a leaky cable model specifically includes:
setting parameters of a leaky cable, namely the size of an outer conductor, the size of insulation, the size of an inner conductor, the size of a slotted hole of the outer conductor, the length of an antenna and the wavelength under a set frequency;
setting the length of a leaky cable;
creating a cylinder of the outer conductor of the leaky cable;
creating a leaky cable outer conductor slot, and forming a periodic slot on the outer conductor by adopting Boolean subtraction;
creating a leaky cable physical foaming insulation cylinder, subtracting the overlapped part of the insulation and the outer conductor by adopting physical foaming polyethylene insulation and Boolean subtraction, and reserving the insulation part;
selecting a copper material to create an inner conductor, subtracting the overlapped part of the insulation and the inner conductor by Boolean subtraction, and reserving the inner conductor part; and obtaining a leaky cable model.
As a further improvement of the invention, the leakage cable port is formed by establishing ports at two ends of a leakage cable model, the ports are round surfaces, and the outer diameter is the outer diameter of the outer conductor;
the antenna is a half-wave dipole antenna which is created at a position where the leaky coaxial cable is opposite to the slotted hole for a certain distance and is vertical to the axial direction of the leaky coaxial cable, is used for receiving and sending signals and simulates the coupling loss value of the leaky coaxial cable; creating two arms of a half-wave dipole as a cylinder; creating a half-wave dipole antenna port cylinder between the two arms;
the air bin is formed by creating a cylinder outside the leaky cable model, increasing one half wavelength of simulation frequency on the basis that the outer diameter is the outer diameter of an outer conductor, establishing a rectangle by taking the leaky cable as an axial direction and taking the center of a half-wave dipole antenna as a plane, increasing one half wavelength on the basis that the length is the distance between the leaky cable and the antenna, copying upwards and downwards by 30 degrees to establish a sector, combining the sector with the created cylinder, and establishing the air bin around the leaky cable; and subtracting the superposed part of the outer conductor, the insulation and the inner conductor by adopting a Boolean subtraction method.
As a further improvement of the present invention, the antenna is a half-wave dipole antenna; when the ports at the two ends of the leaky cable are excited, the outer surface of the inner conductor is arranged on the inner surface of the outer conductor; the antenna port excitation setting is from the lower edge of the port to the upper edge of the port.
As a further improvement of the invention, the scanning variables comprise the number of scanning points, and the number of scanning points is not less than 50.
As a further improvement of the invention, the outer conductor slot of the leakage cable is a U-shaped slot or a four-splayed slot.
As a further improvement of the invention, the method also comprises a result viewing step:
after the simulation run was completed, the coupling loss, attenuation constant and radiation pattern were examined.
A leaky cable simulation design and analysis system comprises:
the model creating module is used for creating a leaky cable model and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
the condition setting module is used for setting ideal electrical boundary conditions on two arms of the antenna, setting radiation boundary conditions on the surface of the air bin, and setting excitation conditions on two ports of the leaky cable and the antenna;
the solving and setting module is used for setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
the simulation analysis module is used for checking and judging, and performing simulation analysis if the parameters are complete and correct; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the leaky cable simulation design and analysis method when executing the computer program.
A computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the leaky cable simulation design and analysis method.
Compared with the prior art, the invention has the beneficial effects that:
the leaky cable simulation design and analysis method comprises the steps of establishing a basic model and a related accessory model of a leaky cable, setting conditions, solving and setting to obtain parameter scanning analysis and sweep frequency analysis setting results, and performing simulation analysis through result checking and judgment; and (3) performing simulation analysis on different attenuation constants and coupling losses of the leaky cable by adopting a simulation method, and comparing the simulation analysis with an actual test value, thereby improving the leaky cable structure and the slotted hole. And a fan-shaped air bin is established, and the simulation result is similar to the actual value. The half-wave dipole antenna moves along the axial direction of the leaky cable, the moving distance of the half-wave dipole antenna is set to 5/6 of the leaky cable, and the half-wave dipole antenna stops at the position 1/12 from the head end and the tail end of the length of the leaky cable and is closer to an actual test value. The method is simple to implement, whether the size of the designed slotted hole meets the requirement can be quickly judged, and slotted hole improvement is realized, so that the research and development efficiency is improved, and the research and development cost is reduced.
Drawings
FIG. 1 is a schematic flow chart of a leaky cable simulation design and analysis method according to the present invention;
FIG. 2 is a leaky cable simulation analysis design diagram provided in accordance with an embodiment of the present invention;
FIG. 3 is a leaky cable model creation diagram provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of a leaky cable model according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a leaky cable air bin model according to an embodiment of the present invention.
FIG. 6 is a schematic structural diagram of a leaky cable simulation design and analysis system according to the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
As shown in fig. 1, the present invention provides a leaky cable simulation design and analysis method, which includes the following steps:
creating a leaky cable model, and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
setting ideal electric boundaries on two arms of the antenna, setting a radiation boundary on the surface of the air bin, and exciting at two ports of the leaky cable and the antenna setting port;
setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
checking and judging, and if the parameters are complete and correct, performing simulation analysis; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
The method is simple to realize, can quickly realize the improvement and optimization of the slotted hole, and determines the size and the structure of the slotted hole with better product performance, thereby improving the research and development efficiency and quality and reducing the research and development cost.
The method comprises the following specific steps:
firstly, building a leaky cable length, an inner conductor, an insulation, an outer conductor and a slot model;
secondly, a leaky cable port model, a half-wave dipole antenna model and an air bin model are created;
setting an ideal electrical boundary on the half-wave dipole antenna, setting a radiation boundary on the surface of the air bin, and setting port excitation on two ports of the leaky cable and the half-wave dipole antenna;
setting frequency and frequency range, and adding one or more scanning variables;
design inspection, if the parameters are complete and correct, performing simulation analysis operation, if an error exists, searching and modifying the error reason, and after the error is checked, performing simulation analysis;
and after the simulation operation in the step six is finished, checking results such as coupling loss, attenuation constant and radiation pattern.
Example 1
With reference to fig. 2 and 3, the leaky cable simulation design and analysis method of the present invention includes the following specific steps:
step one, building a leaky cable model;
with the attached figure 1, the method specifically comprises the following steps:
a) parameters such as leakage cable parameter setting, outer conductor size, insulation size, inner conductor size, outer conductor slot hole size (slot length, slot width, angle, pitch and slot spacing), antenna length, wavelength under set frequency and the like are convenient for later parameter calling and simulation parameter adjustment;
the length of the leaky cable is set to be 20 times of the pitch of the slotted hole, so that the simulation analysis result is close to an actual test value, the simulation analysis normal operation is facilitated, the simulation speed is high, and the working stop state is avoided.
b) And (3) creating an outer conductor of the leakage cable, creating a cylinder, and calling the outer diameter of the outer conductor from parameter setting, wherein the outer diameter of the outer conductor of the leakage cable is 44.5mm from 1 to 5/8, and the outer diameter of the outer conductor of the leakage cable is 34.5mm from 1 to 1/4.
c) The leakage cable outer conductor slot is created, the outer conductor slot generally adopts a U-shaped slot and a four-splayed slot, a rectangle is drawn, parameters such as slot length, slot width, angle, pitch, slot spacing and the like are called, and 20 groups of periodic slots appear on the outer conductor by adopting Boolean subtraction.
d) The leakage cable physical foaming insulation is established, a cylinder is established, a physical foaming polyethylene insulation material is generally adopted, the insulation outer diameter is called from parameter setting, the insulation outer diameter of 1-5/8 leakage cables is 43.0mm, the outer diameter of 1-1/4 leakage cable outer conductors is 33.0mm, Boolean subtraction is adopted, the overlapped part of the insulation and the outer conductors is subtracted, and the insulation part is reserved.
e) The inner conductor of the leaky cable is created, a cylinder is created, a copper strip is adopted as the inner conductor, a copper material is selected as the material, the outer diameter of the inner conductor is called from parameter setting, the outer diameter of the inner conductor of the leaky cable is 17.3mm in the range of 1-5/8, the outer diameter of the inner conductor of the leaky cable is 13.1mm in the range of 1-1/4, Boolean subtraction is adopted, the overlapped part of the insulation and the inner conductor is subtracted, and the inner conductor part is reserved.
With reference to fig. 3, the leaky cable simulation design and analysis method of the invention includes the following steps:
step two, leaky cable port creation
Ports are established at two ends of the leaky cable model, the ports are round surfaces, and the outer diameter is the outer diameter of the outer conductor.
Step three, antenna model creation
And a half-wave dipole antenna which is vertical to the axial direction of the leaky coaxial cable is established at the position of the leaky coaxial cable, which is opposite to the slot hole 2m, and is used for receiving and sending signals and simulating the leaky coaxial cable coupling loss value. Creating two arms of a half-wave dipole, wherein the two arms are cylinders, the outer diameter of each arm is 4mm, the length of one arm is one quarter wavelength of simulation frequency, creating a half-wave dipole antenna port between the two arms, and creating cylinders, and the length of each cylinder is 4 mm.
Step four, air chamber creation
As shown in fig. 4, a cylinder is created outside the leaky cable model, the outer diameter is the outer diameter of the outer conductor, the simulation frequency is increased by one half wavelength, the leaky cable is taken as the axial direction, the center of the half-wave dipole antenna is taken as the plane to create a rectangle, the length is increased by one half wavelength on the basis of the distance between the leaky cable and the antenna, a sector is copied and created upwards and downwards by 30 degrees at the same time, and the sector is combined with the created cylinder, and an air chamber is created around the leaky cable. And subtracting the superposed part of the outer conductor, the insulation and the inner conductor by adopting a Boolean subtraction method.
Step five, setting boundary conditions and port excitation
The leaky cable model, the antenna model and the air chamber model are established and then boundary conditions are set, so that the complexity of the model can be effectively simplified, an ideal electric boundary is set at two arms of the half-wave dipole antenna, and a radiation boundary is set at the outer surface of the air chamber.
When the ports at the two ends of the leaky cable are excited, the outer surface of the inner conductor is arranged on the inner surface of the outer conductor; when the antenna port is set for excitation, the impedance of a leakage cable is 50 omega from the lower edge of the port to the upper edge of the port, and the impedance is set to be 50 omega in the port excitation; the impedance of the leakage cable is designed and researched to be 75 omega, the impedance is set to be 75 omega in port excitation, the performance of the leakage cable with different frequencies can be effectively, quickly and accurately calculated, and the leakage cable is close to an actual measurement value.
Step six, solving the setting
Setting frequency and scanning points, wherein the number of the scanning points is not less than 50, and the more the number of the scanning points is, the closer the simulation data is to an actual test value.
Step seven, scanning and analyzing parameters
The coupling loss is not a position determination, and is obtained by a 95% probability value through multi-point measurement, so that the half-wave dipole antenna is set as a variable, and since the half-wave dipole antenna moves along the axial direction of the leaky cable, the moving distance of the half-wave dipole antenna is set to 5/6 of the leaky cable, and the half-wave dipole antenna stops at a position 1/12 from the length of the leaky cable, so that the half-wave dipole antenna is closer to the actual test.
Step eight, setting frequency sweep analysis
If the whole frequency band is swept, setting an initial frequency and an end frequency in the sweep setting, for example, setting the initial frequency to 700MHz and the end frequency to 3700MHz, and displaying the attenuation constant and the coupling loss of the 700MHz-3700MHz frequency band according to the checking result. If set to a single frequency, a single frequency is set in a sweep frequency analysis setup and the single frequency attenuation constant and coupling loss are read.
Nine steps, design inspection and operation simulation analysis
And after the steps are completed, carrying out design inspection, if no problem exists, directly carrying out operation analysis, modifying the corresponding position if no problem exists, and carrying out operation analysis after the error is confirmed.
Step ten, checking results
And after the simulation analysis operation is finished, checking the coupling loss, the attenuation value, the radiation plane diagram and the 3D directional diagram.
Example 2
The simulation design is carried out by taking 1-5/8 leaky cable 900MHz as an example and combining the graph of FIG. 4 and the graph of FIG. 5.
(1) The length of the leaky cable is set to 4400-4800 mm,
(2) and (3) creating an outer conductor of the leaky cable, creating a cylinder made of copper, determining the center of the cylinder as the length central point of the leaky cable in parameter setting, and calling the outer diameter of the outer conductor to be 44.5mm from the parameter setting.
(3) And (3) creating an outer conductor slot of the leaky cable, drawing a rectangle by adopting a four-splayed slot, calling parameters such as slot length, slot width, angle, pitch, slot spacing and the like, copying 19 groups of pitches, and generating 20 groups of periodic slots on the outer conductor by adopting Boolean subtraction.
(4) The method comprises the steps of creating physical foaming insulation of the leaky cable, creating a cylinder, wherein the material is physical foaming polyethylene insulation, setting a dielectric constant of 1.22, comparing dielectric loss with tangent of 0.00004, determining the center of the cylinder as a leaky cable length central point in parameter setting, calling the insulation outer diameter of 43.0mm from the parameter setting, subtracting the superposed part of the insulation and an outer conductor by Boolean subtraction, and keeping the insulation part.
(5) The method comprises the steps of creating an inner conductor of the leaky cable, creating a cylinder made of copper, determining the center of the cylinder as the length center point of the leaky cable in parameter setting, calling the outer diameter of the inner conductor to be 17.3mm in parameter setting, subtracting the overlapped part of the insulation and the inner conductor by Boolean subtraction, and keeping the part of the inner conductor.
(6) The half-wave dipole antenna is established, a half-wave dipole antenna which is vertical to the axial direction of the leaky coaxial cable is established at the position where the leaky coaxial cable is opposite to the slotted hole 2m, two arms of the half-wave dipole are established, the arms are cylinders, the outer diameter of the half-wave dipole antenna is 4mm, the length of one arm is a quarter wavelength (83.3mm) of simulation frequency, a half-wave dipole antenna port is established between the two arms, and the cylinders are established, and the length of the cylinder is 4 mm.
(7) And (3) establishing an air chamber, namely establishing a cylinder outside the leaky cable model, wherein the outer diameter of the cylinder is 212mm, then establishing a rectangle by taking the leaky cable as an axial direction and taking the center of the half-wave dipole antenna as a plane, increasing one half wavelength on the basis of the distance between the leaky cable and the antenna, simultaneously copying upwards and downwards for 30 degrees to establish a sector, combining the sector with the established cylinder, and establishing the air chamber around the leaky cable. And subtracting the superposed part of the outer conductor, the insulation and the inner conductor by adopting a Boolean subtraction method.
(8) The ports at the two ends of the leaky cable are provided with excitation from the outer surface of the inner conductor to the inner surface of the outer conductor; the antenna port excitation sets the excitation from the lower edge of the port to the upper edge of the port, with a leaky cable impedance of 50 Ω set to 50 Ω in the port excitation.
(9) Setting frequency, scanning points, wherein the number of the scanning points is not less than 50.
(10) The half-wave dipole antenna is set to be variable, and the half-wave dipole antenna moves along the axial direction of the leaky cable, so that the moving distance of the half-wave dipole antenna is set to be 5/6 of the leaky cable, and the half-wave dipole antenna stops at a position 1/12 from the head end and the tail end of the length of the leaky cable.
(11) And after the steps are completed, carrying out design inspection, if no problem exists, directly carrying out operation analysis, modifying the corresponding position if no problem exists, and carrying out operation analysis after the error is confirmed.
(12) And after the simulation analysis operation is finished, checking the coupling loss, the attenuation value, the radiation plane diagram and the 3D directional diagram.
In the embodiment, the 900MHz attenuation and coupling loss of the 1-5/8 leaky cable are subjected to simulation analysis by adopting a simulation method, the attenuation constant of the leaky cable is smaller than 0.2dB/100m and the coupling loss is larger than 0.5dB compared with the attenuation constant of a leaky cable of 50m in an actual test, so that the judgment result of the simulation analysis of the leaky cable test adopting a length of 50m is similar to that of the leaky cable test adopting the method, and the feasibility of the method is further verified.
The invention adopts a simulation method to carry out simulation analysis on different attenuation constants and coupling losses of the leaky cable, and compares the simulation analysis with an actual test value, thereby improving the leaky cable structure and the slotted hole.
In the invention, the fan-shaped air cabin is established, and the simulation result is similar to the actual value.
The half-wave dipole antenna moves along the axial direction of the leaky cable, the moving distance of the half-wave dipole antenna is set to 5/6 of the leaky cable, and the half-wave dipole antenna stops at the position 1/12 from the head end and the tail end of the length of the leaky cable, so that the half-wave dipole antenna is closer to an actual test value. As shown in fig. 6, another objective of the present invention is to provide a leaky cable simulation design and analysis system, which includes:
the model creating module is used for creating a leaky cable model and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
the condition setting module is used for setting ideal electrical boundary conditions on two arms of the antenna, setting radiation boundary conditions on the surface of the air bin, and setting excitation conditions on two ports of the leaky cable and the antenna;
the solving and setting module is used for setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
the simulation analysis module is used for checking and judging, and performing simulation analysis if the parameters are complete and correct; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
A third object of the present invention is to provide an electronic device, as shown in fig. 7, including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the leaky cable simulation designing and analyzing method when executing the computer program.
The leaky cable simulation design and analysis method comprises the following steps:
creating a leaky cable model, and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
setting ideal electric boundaries on two arms of the antenna, setting a radiation boundary on the surface of the air bin, and exciting at two ports of the leaky cable and the antenna setting port;
setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
checking and judging, and if the parameters are complete and correct, performing simulation analysis; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
A fourth object of the present invention is to provide a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the leaky cable simulation designing and analyzing method.
The leaky cable simulation design and analysis method comprises the following steps:
acquiring online prediction target information;
creating a leaky cable model, and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
setting ideal electric boundaries on two arms of the antenna, setting a radiation boundary on the surface of the air bin, and exciting at two ports of the leaky cable and the antenna setting port;
setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
checking and judging, and if the parameters are complete and correct, performing simulation analysis; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A leaky cable simulation design and analysis method is characterized by comprising the following steps:
creating a leaky cable model, and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
setting ideal electric boundaries on two arms of the antenna, setting a radiation boundary on the surface of the air bin, and exciting at two ports of the leaky cable and the antenna setting port;
setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
checking and judging, and if the parameters are complete and correct, performing simulation analysis; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
2. The method of claim 1, wherein:
the creating of the leaky cable model specifically comprises:
setting parameters of a leaky cable, namely the size of an outer conductor, the size of insulation, the size of an inner conductor, the size of a slotted hole of the outer conductor, the length of an antenna and the wavelength under a set frequency;
setting the length of a leaky cable;
creating a cylinder of the outer conductor of the leaky cable;
creating a leaky cable outer conductor slot, and forming a periodic slot on the outer conductor by adopting Boolean subtraction;
creating a leaky cable physical foaming insulation cylinder, subtracting the overlapped part of the insulation and the outer conductor by adopting physical foaming polyethylene insulation and Boolean subtraction, and reserving the insulation part;
selecting a copper material to create an inner conductor, subtracting the overlapped part of the insulation and the inner conductor by Boolean subtraction, and reserving the inner conductor part; and obtaining a leaky cable model.
3. The method of claim 1, wherein:
the leakage cable port is formed by establishing ports at two ends of a leakage cable model, is a circular surface and has the outer diameter of the outer conductor;
the antenna is a half-wave dipole antenna which is created at a position where the leaky coaxial cable is opposite to the slotted hole for a certain distance and is vertical to the axial direction of the leaky coaxial cable, is used for receiving and sending signals and simulates the coupling loss value of the leaky coaxial cable; creating two arms of a half-wave dipole as a cylinder; creating a half-wave dipole antenna port cylinder between the two arms;
the air bin is formed by creating a cylinder outside the leaky cable model, increasing one half wavelength of simulation frequency on the basis that the outer diameter is the outer diameter of an outer conductor, establishing a rectangle by taking the leaky cable as an axial direction and taking the center of a half-wave dipole antenna as a plane, increasing one half wavelength on the basis that the length is the distance between the leaky cable and the antenna, copying upwards and downwards by 30 degrees to establish a sector, combining the sector with the created cylinder, and establishing the air bin around the leaky cable; and subtracting the superposed part of the outer conductor, the insulation and the inner conductor by adopting a Boolean subtraction method.
4. The method of claim 1, wherein:
the antenna is a half-wave dipole antenna; when the ports at the two ends of the leaky cable are excited, the outer surface of the inner conductor is arranged on the inner surface of the outer conductor; the antenna port excitation setting is from the lower edge of the port to the upper edge of the port.
5. The method of claim 1, wherein:
the scanning variables comprise the number of scanning points, and the number of the scanning points is not less than 50.
6. The method of claim 1, wherein:
the outer conductor slot of the leakage cable is a U-shaped slot or a four-splayed slot.
7. The method of claim 1, wherein:
further comprising a result viewing step:
after the simulation run was completed, the coupling loss, attenuation constant and radiation pattern were examined.
8. A leaky cable simulation design and analysis system is characterized by comprising:
the model creating module is used for creating a leaky cable model and creating a leaky cable port, an antenna and an air bin on the basis of the leaky cable model;
the condition setting module is used for setting ideal electrical boundary conditions on two arms of the antenna, setting radiation boundary conditions on the surface of the air bin, and setting excitation conditions on two ports of the leaky cable and the antenna;
the solving and setting module is used for setting frequency, frequency range and scanning variable, and performing parameter scanning analysis and frequency sweeping analysis setting;
the simulation analysis module is used for checking and judging, and performing simulation analysis if the parameters are complete and correct; if the error exists, searching and modifying the error reason, and running simulation analysis after checking that the error does not exist.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the leaky cable simulation design and analysis method as claimed in any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium storing a computer program which, when executed by a processor, performs the steps of the leaky cable simulation design and analysis method as claimed in any one of claims 1 to 7.
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