CN102590656A - Antenna cover electric property forecasting method based on distant field - Google Patents
Antenna cover electric property forecasting method based on distant field Download PDFInfo
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Abstract
The invention discloses an antenna cover electric property forecasting method based on a distant field. The problems in the prior art of large calculation amount and inaccurate modeling can be mainly solved. According to the technical scheme, the antenna cover electric property forecasting method comprises the following steps of: establishing an antenna model and a feed source model in electromagnetic analysis software or giving a feed source distant field in a file manner; solving an antenna two-dimensional distant field value under feed source excitation, drawing a directional diagram and extracting electric property indexes; establishing a bolt model and solving a three-dimensional distant field under bolt influence; establishing an antenna cover model, solving a two-dimensional distant field value under three-dimensional distant field excitation, drawing a directional diagram and extracting electric property indexes; comparing the two-dimensional direction diagrams before and after additionally arranging the antenna cover; if a result meets requirements, outputting the two-dimensional direction diagrams before and after additionally arranging the antenna cover, an electric property variation value and structural parameters; and otherwise, modifying the antenna cover model and repeating an analysis process until the result meets the requirements. According to the antenna cover electric property forecasting method provided by the invention, the calculation amount is reasonably controlled, and the electric property of the large-size electric antenna cover is forecasted more accurately.
Description
Technical field
The invention belongs to the Radar Antenna System field, specifically is a kind of antenna house electrical behavior prediction method based on the far field, is used for the long-pending electrical property greater than 100 TV university size band cover antenna system of frequency of operation GHz and antenna aperture m is predicted.
Technical background
Antenna house is that the protection antenna is avoided the shell of natural environment influence, is by coverture natural or that artificial dielectric's material is processed, or the bright window of electromagnetism of the special shape that is made up of the dielectric housing of truss support.The antenna house of excellent in design; Except having protectiveness, conduction, reliability, disguise and function such as ornamental; Consider from economic benefit, can also prolong the total system each several part serviceable life, reduce life-span cost and running cost, simplified design, reduction maintenance cost, guarantee antenna surface and position degree of accuracy, create good working environment for the antenna operation personnel.But antenna house also can exert an influence to the electromagnetic radiation of ideal antenna, and desirable antenna electric performance is decreased.Radome design is the somewhat complex design that structural design combines with the electrical property design.
Along with the progress of China's aviation, meteorology and military technology and the development of military situation, the research of carrying out High Accuracy Radar such as long-range precision tracking instrumentation radar and high-gain aerial has become urgent task with making.These antenna system bore can reach tens meters, and working frequency range can reach high bands such as C, X even Ka.And the physical environment in special geographic position is bigger to the influence of equipment, and being equipped with antenna house becomes these radars, the requisite requirement of antenna, and therefore the demand to TV university size antenna cover becomes more and more urgent.
Rong Hua has adopted the spectrum of plane waves based on the near field in paper " about the discussion of antenna house electrical property numerical modeling and simulation problems " in 2010---and surface integral method is predicted the antenna house electrical property; This method is at first utilized the integration of radiating antenna is confirmed to be incident in the near field on the antenna house inside surface; Secondly calculate the transmitted field that sees through on the outside surface of radome wall; Last according to by along the tangent line field distribution on the cover outer surface, antenna house outside surface integration is tried to achieve the far field antenna pattern of antenna, antenna house synthesis.The deficiency of this method is: for TV university size band cover antenna since its calculated amount excessive, in practical application, often can't in the time that requires, obtain the result, sometimes in addition existing equipment can't calculate at all.
Zhang Yizhou is in paper " antenna house being influenced the analysis of antenna radiation performance " in 2004; Utilize Complex Ray Theory that antenna, antenna house system are carried out integrated analysis; This method at first utilize multiple source point field to the free space antenna radiation pattern with, the difference lobe simulate; Utilize compound ray paraxial approximation and set rays method to calculate the field after each multiple source point reflects, reflects through antenna house one by one then; Carry out the weighting superposition through each multiple source point simulation yard at last, thus draw antenna and antenna house with, the difference directional diagram.When using this method and carrying out actual computation, need set up the concrete model of antenna house, the antenna house model of having set up a smooth layering in the literary composition calculates.Owing to do not consider the bolt on antenna house piecemeal, scrap (bridge) and the antenna house in this model, thereby the result of calculation of using this method to obtain is inaccurate.
Summary of the invention
The objective of the invention is to deficiency, a kind of antenna house electrical behavior prediction method based on the far field is provided,, improve the electrical property precision of prediction to reduce computing time to above-mentioned prior art.
For realizing above-mentioned purpose, the present invention includes following two kinds of technical schemes:
Technical scheme 1:
The present invention is based on the antenna house electrical behavior prediction method in far field, it is characterized in that utilizing commercial emi analysis software to predict as follows:
(1) according to the structural parameters of parabola antenna, set up the geometric model of antenna, by 1/5th wavelength antenna model is divided grid;
(2) according to the structural parameters of parabola antenna, set up the feed geometric model of antenna, with this feed model as excitation, under the excitation of feed, day alignment space radiation electromagnetic wave;
(3) the electromagnetic ability of aerial radiation is characterized with directional diagram, use physical optical method to find the solution the two-dimentional far field value of antenna, draw directional diagram and extract the electrical performance indexes of antenna;
(4) in step (1), on the basis of the antenna model of building,, set up the bolt geometric model on the antenna house again, this bolt geometric model is carried out grid dividing by 1/5th wavelength according to the structural parameters of antenna house;
(5) according to the two-dimensional directional figure that tries to achieve in the step (3); Confirm the zoning and the discrete precision of the three-dimensional far-field pattern of antenna under the bolt diffuse transmission influence; Use physical optical method to find the solution the three-dimensional far field value of this antenna, draw directional diagram, and result of calculation is output as a file;
(6) according to the structural parameters of antenna house, set up the antenna house geometric model, by two times of wavelength this antenna house geometric model is carried out grid dividing;
(7) with the three-dimensional far field value of the antenna of trying to achieve in the step (5) as excitation, use the two-dimentional far field value after geometrical optics approach is found the solution the antenna covering, draw directional diagram and extract the electrical performance indexes of band cover antenna;
(8) the two-dimentional far-field pattern of antenna and the electrical performance indexes that obtain in contrast step (3) and the step (7) are obtained the electrical property changing value behind the antenna covering respectively, i.e. gain loss value, minor level lift-off value and main lobe width changing value;
(9) according to the requirement on electric performance of Antenna Design; Judge whether the electrical property changing value behind the antenna covering satisfies preset requirement; If satisfy, then export two-dimentional far-field pattern, the electrical property changing value behind the antenna covering and the structural parameters of antenna house of antenna covering front and back; Otherwise, the structural parameters of modification antenna house, and repeating step (4) meets the demands until the result to step (9).
The described geometric model of setting up antenna of step (1) is according to antenna aperture D and focal distance f, in commercial emi analysis software, sets up a parabola, and parabolic summit is taken at the coordinate origin place, and the antenna opening diametric plane is vertical with the z axle.
The described feed geometric model of setting up antenna of step (2) is that foundation length is the line segment of 1/2nd wavelength, and this line segment is parallel with the antenna opening diametric plane, and mid point is line focus in the sky, in midpoint this line segment is broken off.
The described use physical optical method of step (3) is found the solution the two-dimentional far field value of antenna, carries out as follows:
(3a) the outside radiated electromagnetic wave of feed, this electromagnetic wave can induce surface current in antenna surface, calculates the far field value of feed according to the form of feed;
(3b) according to the far field value of feed, the surface current that calculates on the antenna surface distributes, and this surface current distributes to the space radiation electromagnetic wave;
(3c) distribute according to the surface current on the antenna surface, integration is found the solution the two-dimentional far field value of antenna in E face, H face.
Step (4) is described, sets up the bolt geometric model of antenna house, carries out as follows:
(4a) simulate bolt with rectangular parallelepiped, promptly getting the rectangular parallelepiped height is the bolt height, and getting the rectangular parallelepiped length and width is bolt bottom surface diameter, the parabolic summit of rectangular parallelepiped orientation of its axis;
(4b) bolt is distributed on the sphere at antenna house model place, and confirms the coordinate of bolt by the physical location of bolt on the antenna house.
Step (5) is described, confirms the zoning and the discrete precision of the three-dimensional far-field pattern of antenna under the bolt diffuse transmission influence, carries out as follows:
In the antenna two dimension far-field pattern of (5a) from step (3), trying to achieve, obtain the energy distribution and the main lobe width of antenna radiation pattern, this energy distribution is meant the minimum gain value in the unspecified angle scope in normalized radiation pattern;
(5b) confirm the zoning of the vertical circumferencial direction of the three-dimensional far-field pattern of antenna according to the energy distribution of antenna two dimension far-field pattern, minimum gain value is as required got the zoning that corresponding angular range is vertical circumferencial direction;
(5c) get-90 °～90 ° zonings for the horizontal circumferencial direction of the three-dimensional far-field pattern of antenna;
(5d) get 1/12nd discrete precision of antenna two dimension far-field pattern main lobe width as the vertical circumferencial direction of the three-dimensional far-field pattern of antenna;
(5e) get 0.5 ° of discrete precision for the horizontal circumferencial direction of the three-dimensional far-field pattern of antenna.
The described antenna house geometric model of setting up of step (6), carry out as follows:
(6a) according to the structural parameters of antenna house, smooth antenna house is set up out in layering, for avoiding interfering between the different materials, reserves the gap of micron dimension between layer and the layer;
(6b) according to the block form of antenna house, at the piecemeal place the smooth antenna house of build is cut apart, obtained the scrap (bridge) between piecemeal and the piecemeal, the scrap (bridge) version that obtain this moment is the same with piecemeal;
(6c), delete unnecessary layering, and the thickness of each layer that remains is set according to the hierarchy number of scrap (bridge) and the thickness of each layer.
The described use geometrical optics approach of step (7) is found the solution the two-dimentional far field value behind the antenna covering, carries out as follows:
The antenna field of (7a) calculating in the antenna house distributes;
(7b) according to the version of antenna house, calculate transmission coefficient, the reflection coefficient of antenna house;
(7c) calculate the field distribution that sees through the antenna house aft antenna, and integration is found the solution the two-dimentional far field value of antenna in E face, H face.
Technical scheme 2:
The present invention is based on the antenna house electrical behavior prediction method in far field, it is characterized in that utilizing commercial emi analysis software to predict as follows:
1) according to the structural parameters of parabola antenna, set up the geometric model of antenna, by 1/5th wavelength antenna model is divided grid;
2) known feed far field value is saved as a file, and import to institute and build in the antenna geometric model as excitation, under the excitation of feed, day alignment space radiation electromagnetic wave;
3) the electromagnetic ability of aerial radiation is characterized with directional diagram, use physical optical method to find the solution the two-dimentional far field value of antenna, draw directional diagram and extract the electrical performance indexes of antenna;
4) in step 1), on the basis of the antenna model of building,, set up the bolt geometric model on the antenna house again, this bolt geometric model is carried out grid dividing by 1/5th wavelength according to the structural parameters of antenna house;
5) according to the two-dimensional directional figure that tries to achieve in the step 3); Confirm the zoning and the discrete precision of the three-dimensional far-field pattern of antenna under the bolt diffuse transmission influence; Use physical optical method to find the solution the three-dimensional far field value of this antenna, draw directional diagram, and result of calculation is output as a file;
6) according to the structural parameters of antenna house, set up the antenna house geometric model, by two times of wavelength this antenna house geometric model is carried out grid dividing;
7) with the three-dimensional far field value of the antenna of trying to achieve in the step 5) as excitation, use the two-dimentional far field value after geometrical optics approach is found the solution the antenna covering, draw directional diagram and extract the electrical performance indexes of band cover antenna;
8) the two-dimentional far-field pattern of antenna and the electrical performance indexes that obtain in contrast step 3) and the step 7) are obtained the electrical property changing value behind the antenna covering respectively, i.e. gain loss value, minor level lift-off value and main lobe width changing value;
9) according to the requirement on electric performance of Antenna Design; Judge whether the electrical property changing value behind the antenna covering satisfies preset requirement; If satisfy, then export two-dimentional far-field pattern, the electrical property changing value behind the antenna covering and the structural parameters of antenna house of antenna covering front and back; Otherwise, revise the structural parameters of antenna house, and repeat step 4) to step 9), meet the demands until the result.
The present invention compared with prior art has following advantage:
(1) the present invention is owing to use far-field pattern to predict the electrical property of antenna house; And adopted physical optical method when finding the solution antenna two dimension far field value, antenna three-dimensional far field value; Adopted geometrical optics approach when finding the solution the two-dimentional far field value of covering aft antenna; Confirmed the zoning and the discrete precision of the three-dimensional far-field pattern of antenna in addition according to the energy distribution of antenna two dimension far-field pattern and main lobe width, thereby as a result on the basis of precision, reduced calculated amount greatly in assurance;
(2) the present invention is owing to when finding the solution antenna three-dimensional far field value, considered the influence of bolt scattering, and when setting up the geometric model of antenna house, set up piecemeal, scrap (bridge) respectively that the precision of prediction antenna house electrical property is higher.
Description of drawings
Fig. 1 is the antenna house electrical behavior prediction method process flow diagram that the present invention is based on the far field;
Fig. 2 is that the present invention confirms the zoning of the three-dimensional far-field pattern of antenna and the sub-process figure of discrete precision;
Fig. 3 is antenna house modeling sub-process figure of the present invention;
Fig. 4 is an A interlayer antenna house cross section structure synoptic diagram;
Fig. 5 is a C interlayer antenna house cross section structure synoptic diagram;
Fig. 6 is an antenna house scrap (bridge) structural representation;
Fig. 7 is the bolt model synoptic diagram on the antenna house;
Fig. 8 is an antenna house model synoptic diagram;
Fig. 9 is an antenna two dimension far-field pattern;
Figure 10 is the three-dimensional far-field pattern of antenna;
Figure 11 is the antenna two dimension far-field pattern behind the covering.
Embodiment
Followingly the present invention is described in further detail with reference to accompanying drawing.
Embodiment 1:
With reference to Fig. 1, performing step of the present invention is following:
Step 1 is set up the geometric model of parabola antenna.
Obtain antenna aperture D, focal distance f, in commercial emi analysis software, set up a parabola, parabolic summit is taken at the coordinate origin place, and the antenna opening diametric plane is vertical with the z axle; After modeling is accomplished; Obtain operating frequency of antenna freq, light velocity c; Calculate wavelength X according to formula
; Then parabola is divided grid, the grid length of side is set to
Step 2 is set up the geometric model of feed, with this excitation as antenna.
Realize adding excitation through the geometric model of setting up feed in this instance to antenna; The foundation of this feed is that structure length is 1/2nd wavelength earlier, and mid point is positioned at the antenna along, and the line segment parallel with the antenna opening diametric plane; In midpoint this line segment is broken off then, promptly get the dipole feed model; Under the excitation of feed, day alignment space radiation electromagnetic wave.
Feed of the present invention is not limited in this kind dipole feed, also can use horn feed.
Step 3 is confirmed the zoning and the discrete precision of antenna two dimension far-field pattern.
The electromagnetic ability of aerial radiation is characterized with directional diagram, and in order to obtain the complete information of directional diagram energy distribution, the zoning of vertical circumferencial direction is taken as-180 °～180 °, and the discrete precision of vertical circumferencial direction is taken as
Step 4, confirm zoning and discrete precision after, use physical optical method to calculate the two-dimentional far field value of antenna as follows, and draw directional diagram.
(4a) the outside radiated electromagnetic wave of feed, this electromagnetic wave can induce surface current in antenna surface, calculates the far field value of feed according to the form of feed;
(4b) according to the far field value of feed, the surface current that calculates on the antenna surface distributes, and this surface current distributes to the space radiation electromagnetic wave;
(4c) distribute according to the surface current on the antenna surface, integration is found the solution the two-dimentional far field value of antenna in E face, H face.
According to the two-dimentional far field value that obtains, draw directional diagram, and extract electrical performance indexes, be i.e. yield value, minor level value and main lobe width value.
Step 5 is set up the bolt model on the antenna house.
(5a) simulate bolt with rectangular parallelepiped, promptly getting the rectangular parallelepiped height is the bolt height, and getting the rectangular parallelepiped length and width is bolt bottom surface diameter, the parabolic summit of rectangular parallelepiped orientation of its axis;
(5b) bolt is distributed on the sphere at antenna house model place, and confirms the coordinate of bolt, accomplish bolt modeling antenna house by the physical location of bolt on the antenna house.
After the bolt modeling is accomplished; Bolt is divided grid; Because will analyze the influence of bolt with physical optical method; And physical optical method is higher to the grid accuracy requirement; So the length of side is set to
to grid because bolt can produce scattering to the electromagnetic wave of aerial radiation, and then influences the far-field pattern of antenna.
Step 6 is calculated the three-dimensional far field value of antenna under the bolt diffuse transmission influence, and is drawn directional diagram.
With reference to Fig. 2, the concrete realization of this step is following:
(6a) analyze the antenna two-dimensional directional figure that from step 3, tries to achieve; Obtain the energy distribution and the main lobe width of antenna radiation pattern; This energy distribution is meant the minimum gain value in the unspecified angle scope in normalized radiation pattern, this main lobe width refers under the normalized gain-and lobe width that 3dB is corresponding;
(6b) confirm the zoning of vertical circumferencial direction according to the energy distribution of antenna radiation pattern; The part that energy in the directional diagram is very little is ignored; When reducing three-dimensional figure zoning; Influence to result of calculation is also less, and minimum gain value is as required got the zoning that corresponding angular range is vertical circumferencial direction; Experience shows that the above three-dimensional far-field pattern of intercepting-50dB can satisfy calculation requirement, finds out corresponding with it angle according to antenna two dimension far-field pattern, as is 30 °, and the zoning of then getting vertical circumferencial direction is-30 °～30 °;
(6c) because will calculate the directional diagram of whole horizontal circumferencial direction, horizontal circumference direction calculating zone is taken as-90 °～90 °, and the zoning of this moment is a truncated-spherical;
(6d) confirm the discrete precision of vertical circumferencial direction according to the main lobe width of antenna radiation pattern; Main lobe width draws from antenna two dimension far-field pattern; Make to comprise 12 discrete points in the main lobe width, so get 1/12nd discrete precision of antenna two dimension far-field pattern main lobe width as the vertical circumferencial direction of the three-dimensional far-field pattern of antenna;
(6e) according to three-dimensional far-field pattern be the form of a circle symmetry basically; Along vertical circumferencial direction many lobes are arranged; But in then the be far from characteristics of so many lobes of horizontal circumferencial direction, the discrete precision of getting the horizontal circumferencial direction of the three-dimensional far-field pattern of antenna is 0.5 ° and can satisfies the demand.
Behind the zoning and discrete precision of confirming vertical circumferencial direction, horizontal circumferencial direction, use physical optical method to calculate the three-dimensional far field value of antenna, draw directional diagram, and result of calculation is saved as a file.
Step 7 is set up the antenna house model.
For dielectric interlayer antenna house commonly used, need set up out the model of each layer of antenna house respectively, and in order better to reflect practical problems, antenna house needs piecemeal, these all should show in modeling.
With reference to Fig. 3, the concrete realization of this step is following:
(7a) set up the smooth cover of each layer
Inside and outside curve form and size according to each layer cover; Set up out each layer of antenna house successively; Antenna house interlayer form has multiple, and A interlayer commonly used, C interlayer form are respectively like Fig. 4, shown in Figure 5, and the material properties of adjacent layer is different; For avoiding interfering, the gap of a micron dimension should be arranged between layer and the layer;
(7b) cut apart smooth cover and obtain piecemeal and scrap (bridge)
According to the block form of antenna house, smooth cover is cut apart, obtain the scrap (bridge) between piecemeal and the piecemeal, the scrap (bridge) version that obtain this moment is the same with piecemeal;
(7c) handle the scrap (bridge) part
According to the hierarchy number of scrap (bridge) and the thickness of each layer, delete unnecessary layering, and the thickness of each layer that remains is set;
After the antenna house modeling is accomplished, antenna house is divided grid, because will analyze the influence of antenna house with geometrical optics approach, and geometrical optics approach is lower to the grid accuracy requirement, so the grid length of side is set to 2 λ.
Step 8 is calculated the two-dimentional far field value of covering aft antenna, and draws directional diagram.
To confirm the zoning and the discrete precision of vertical circumferencial direction when finding the solution two-dimentional far field value earlier; Sometimes only require and obtain main lobe and nearly secondary lobe zone; Sometimes also require to obtain secondary lobe far away zone, as required, at first utilize the antenna two-dimensional directional figure that tries to achieve in the step 3 to confirm the zoning; Utilize the antenna two-dimensional directional figure that tries to achieve in the step 3 to confirm main lobe width again, get 1/12nd discrete precision of main lobe width as vertical circumferencial direction; Initial point place in the three-dimensional far field value of the antenna that will in step 5, try to achieve the then file importing antenna house model uses geometrical optics approach to calculate the two-dimentional far field value of covering aft antenna according to following steps as excitation:
The antenna field of (8a) calculating in the antenna house distributes;
(8b) according to the version of antenna house, calculate transmission coefficient, the reflection coefficient of antenna house;
(8c) calculate the field distribution that sees through the antenna house aft antenna, and integration is found the solution the two-dimentional far field value of antenna in E face, H face.
According to the two-dimentional far field value that obtains, draw directional diagram, and extract electrical performance indexes, be i.e. yield value, minor level value and main lobe width value.
Step 9, two-dimentional far-field pattern and electrical performance indexes before and after the contrast covering.
Two-dimentional far-field pattern of the antenna that obtains in contrast step 4 and the step 8 and electrical performance indexes are obtained the electrical property changing value behind the antenna covering respectively, i.e. gain loss value, minor level lift-off value and main lobe width changing value.
Step 10, whether judged result meets the demands.
According to the requirement on electric performance of Antenna Design, judge whether the electrical property changing value behind the antenna covering satisfies preset requirement, if satisfy, then export two-dimentional far-field pattern, the electrical property changing value behind the antenna covering and the structural parameters of antenna house of antenna covering front and back; Otherwise, revise the structural parameters of antenna house, and repeat step 4 to step 9, meet the demands until the result.
Embodiment 2:
Step 1 is set up the geometric model of parabola antenna
Obtain antenna aperture D, focal distance f, in commercial emi analysis software, set up a parabola, parabolic summit is taken at the coordinate origin place, and the antenna opening diametric plane is vertical with the z axle; After modeling is accomplished; Obtain operating frequency of antenna freq, light velocity c; Calculate wavelength X according to formula
; Then parabola is divided grid, the grid length of side is set to
Step 2 adds feed far field value as excitation
Known feed far field value is saved as " .dat " file; Import the parabolic focus place; File layout has six column data; Use space-separated between row and the row, every column data is represented vertical circumferencial direction angle, horizontal circumference orientation angle, vertical circumferencial direction electric field amplitude, vertical circumferencial direction electric field phase, horizontal circumferencial direction electric field amplitude, horizontal circumferencial direction electric field phase successively.
Step 3-step 10 is identical with step 3 to the step 10 of embodiment 1.
The calculating of all values among above-mentioned two kinds of embodiment all is after having confirmed zoning, discrete precision and computing method, is carried out automatically according to corresponding calculation method by software.
Advantage of the present invention can further specify through following emulation experiment:
1. simulation parameter
If bore is 5.2 meters, focal length is that 2.08 meters, frequency of operation are the parabola antenna of 20GHz, and the antenna house diameter is 9.14 meters, and structure is an A interlayer form; The form of scrap (bridge) is as shown in Figure 6, and inside and outside covering thickness is 1 millimeter, and core layer thickness is 26 millimeters; The skin material specific inductive capacity is 4.2, and dielectric loss angle tangent is 0.026, and the foamed material specific inductive capacity is 1.15; Dielectric loss angle tangent is 0.0098, and scrap (bridge) is made up of the skin material of two-layer 8 millimeters thick.Bolt on the antenna house distributes as shown in Figure 7, and totally 104, the antenna house block form is as shown in Figure 8, is divided into 69, uses FEKO software to analyze in this example.
2. emulation content and result
Emulation 1 is calculated the two-dimentional far field value of antenna according to above-mentioned parameter, and is drawn directional diagram, and the result is as shown in Figure 9.
Emulation 2 is calculated the three-dimensional far field value of antenna according to above-mentioned parameter, and is drawn directional diagram, and the result is shown in figure 10.
Emulation 3 is calculated the two-dimentional far field value of covering aft antenna according to above-mentioned parameter, and is drawn directional diagram, and the result is shown in figure 11.
The main lobe width and the minor level of antenna can be obtained from Fig. 9, the main lobe width and the minor level of covering aft antenna can be obtained from Figure 11.
Yield value, the first minor level value and the main lobe width value of covering front and back antennas have been listed in the table 1.
The electrical performance indexes of antenna before and after table 1 covering
Visible from table 1, the gain of covering aft antenna descends, and minor level raises, the main lobe broadening.
Above-mentioned emulated data experiment showed, that the present invention can effectively analyze the electrical property of TV university size antenna cover, and can when rationally controlling calculated amount, obtain the higher result of precision.
Claims (9)
1. antenna house electrical behavior prediction method based on the far field is characterized in that utilizing commercial emi analysis software to predict as follows:
(1) according to the structural parameters of parabola antenna, set up the geometric model of antenna, by 1/5th wavelength antenna model is divided grid;
(2) according to the structural parameters of parabola antenna, set up the feed geometric model of antenna, with this feed model as excitation, under the excitation of feed, day alignment space radiation electromagnetic wave;
(3) the electromagnetic ability of aerial radiation is characterized with directional diagram, use physical optical method to find the solution the two-dimentional far field value of antenna, draw directional diagram and extract the electrical performance indexes of antenna;
(4) in step (1), on the basis of the antenna model of building,, set up the bolt geometric model on the antenna house again, this bolt geometric model is carried out grid dividing by 1/5th wavelength according to the structural parameters of antenna house;
(5) according to the two-dimensional directional figure that tries to achieve in the step (3); Confirm the zoning and the discrete precision of the three-dimensional far-field pattern of antenna under the bolt diffuse transmission influence; Use physical optical method to find the solution the three-dimensional far field value of this antenna, draw directional diagram, and result of calculation is output as a file;
(6) according to the structural parameters of antenna house, set up the antenna house geometric model, by two times of wavelength this antenna house geometric model is carried out grid dividing;
(7) with the three-dimensional far field value of the antenna of trying to achieve in the step (5) as excitation, use the two-dimentional far field value after geometrical optics approach is found the solution the antenna covering, draw directional diagram and extract the electrical performance indexes of band cover antenna;
(8) the two-dimentional far-field pattern of antenna and the electrical performance indexes that obtain in contrast step (3) and the step (7) are obtained the electrical property changing value behind the antenna covering respectively, i.e. gain loss value, minor level lift-off value and main lobe width changing value;
(9) according to the requirement on electric performance of Antenna Design; Judge whether the electrical property changing value behind the antenna covering satisfies preset requirement; If satisfy, then export two-dimentional far-field pattern, the electrical property changing value behind the antenna covering and the structural parameters of antenna house of antenna covering front and back; Otherwise, the structural parameters of modification antenna house, and repeating step (4) meets the demands until the result to step (9).
2. the antenna house electrical behavior prediction method based on the far field according to claim 1; It is characterized in that the described geometric model of setting up antenna of step (1); Be according to antenna aperture D and focal distance f; In commercial emi analysis software, set up a parabola, parabolic summit is taken at the coordinate origin place, and the antenna opening diametric plane is vertical with the z axle.
3. the antenna house electrical behavior prediction method based on the far field according to claim 1; It is characterized in that the described feed geometric model of setting up antenna of step (2); Be that foundation length is the line segment of 1/2nd wavelength; This line segment is parallel with the antenna opening diametric plane, and mid point is line focus in the sky, in midpoint this line segment is broken off.
4. the antenna house electrical behavior prediction method based on the far field according to claim 1 is characterized in that the described use physical optical method of step (3) finds the solution the two-dimentional far field value of antenna, carries out as follows:
(3a) the outside radiated electromagnetic wave of feed, this electromagnetic wave can induce surface current in antenna surface, calculates the far field value of feed according to the form of feed;
(3b) according to the far field value of feed, the surface current that calculates on the antenna surface distributes, and this surface current distributes to the space radiation electromagnetic wave;
(3c) distribute according to the surface current on the antenna surface, integration is found the solution the two-dimentional far field value of antenna in E face, H face.
5. the antenna house electrical behavior prediction method based on the far field according to claim 1 is characterized in that step (4) is described, sets up the bolt geometric model of antenna house, carries out as follows:
(4a) simulate bolt with rectangular parallelepiped, promptly getting the rectangular parallelepiped height is the bolt height, and getting the rectangular parallelepiped length and width is bolt bottom surface diameter, the parabolic summit of rectangular parallelepiped orientation of its axis;
(4b) bolt is distributed on the sphere at antenna house model place, and confirms the coordinate of bolt by the physical location of bolt on the antenna house.
6. the antenna house electrical behavior prediction method based on the far field according to claim 1 is characterized in that step (5) is described, confirms the zoning and the discrete precision of the three-dimensional far-field pattern of antenna under the bolt diffuse transmission influence, carries out as follows:
In the antenna two dimension far-field pattern of (5a) from step (3), trying to achieve, obtain the energy distribution and the main lobe width of antenna radiation pattern, this energy distribution is meant the minimum gain value in the unspecified angle scope in normalized radiation pattern;
(5b) confirm the zoning of the vertical circumferencial direction of the three-dimensional far-field pattern of antenna according to the energy distribution of antenna two dimension far-field pattern, minimum gain value is as required got the zoning that corresponding angular range is vertical circumferencial direction;
(5c) get-90 °～90 ° zonings for the horizontal circumferencial direction of the three-dimensional far-field pattern of antenna;
(5d) get 1/12nd discrete precision of antenna two dimension far-field pattern main lobe width as the vertical circumferencial direction of the three-dimensional far-field pattern of antenna;
(5e) get 0.5 ° of discrete precision for the horizontal circumferencial direction of the three-dimensional far-field pattern of antenna.
7. the antenna house electrical behavior prediction method based on the far field according to claim 1 is characterized in that the described antenna house geometric model of setting up of step (6), carries out as follows:
(6a) according to the structural parameters of antenna house, smooth antenna house is set up out in layering, for avoiding interfering between the different materials, reserves the gap of micron dimension between layer and the layer;
(6b) according to the block form of antenna house, at the piecemeal place the smooth antenna house of build is cut apart, obtained the scrap (bridge) between piecemeal and the piecemeal, the scrap (bridge) version that obtain this moment is the same with piecemeal;
(6c), delete unnecessary layering, and the thickness of each layer that remains is set according to the hierarchy number of scrap (bridge) and the thickness of each layer.
8. the antenna house electrical behavior prediction method based on the far field according to claim 1 is characterized in that the two-dimentional far field value after the described use geometrical optics approach of step (7) is found the solution the antenna covering, carries out as follows:
The antenna field of (7a) calculating in the antenna house distributes;
(7b) according to the version of antenna house, calculate transmission coefficient, the reflection coefficient of antenna house;
(7c) calculate the field distribution that sees through the antenna house aft antenna, and integration is found the solution the two-dimentional far field value of antenna in E face, H face.
9. antenna house electrical behavior prediction method based on the far field is characterized in that utilizing commercial emi analysis software to predict as follows:
1) according to the structural parameters of parabola antenna, set up the geometric model of antenna, by 1/5th wavelength antenna model is divided grid;
2) known feed far field value is saved as a file, and import to institute and build in the antenna geometric model as excitation, under the excitation of feed, day alignment space radiation electromagnetic wave;
3) the electromagnetic ability of aerial radiation is characterized with directional diagram, use physical optical method to find the solution the two-dimentional far field value of antenna, draw directional diagram and extract the electrical performance indexes of antenna;
4) in step 1), on the basis of the antenna model of building,, set up the bolt geometric model on the antenna house again, this bolt geometric model is carried out grid dividing by 1/5th wavelength according to the structural parameters of antenna house;
5) according to the two-dimensional directional figure that tries to achieve in the step 3); Confirm the zoning and the discrete precision of the three-dimensional far-field pattern of antenna under the bolt diffuse transmission influence; Use physical optical method to find the solution the three-dimensional far field value of this antenna, draw directional diagram and result of calculation is output as a file;
6) according to the structural parameters of antenna house, set up the antenna house geometric model, by two times of wavelength this antenna house geometric model is carried out grid dividing;
7) with the three-dimensional far field value of the antenna of trying to achieve in the step 5) as excitation, use the two-dimentional far field value after geometrical optics approach is found the solution the antenna covering, draw directional diagram and extract the electrical performance indexes of band cover antenna;
8) the two-dimentional far-field pattern of antenna and the electrical performance indexes that obtain in contrast step 3) and the step 7) are obtained the electrical property changing value behind the antenna covering respectively, i.e. gain loss value, minor level lift-off value and main lobe width changing value;
9) according to the requirement on electric performance of Antenna Design; Judge whether the electrical property changing value behind the antenna covering satisfies preset requirement; If satisfy, then export two-dimentional far-field pattern, the electrical property changing value behind the antenna covering and the structural parameters of antenna house of antenna covering front and back; Otherwise, the structural parameters of modification antenna house, and repeating step (4) meets the demands until the result to step (9).
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