CN102904033B - Feed-forward satellite television antenna and satellite television receiving system thereof - Google Patents
Feed-forward satellite television antenna and satellite television receiving system thereof Download PDFInfo
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Abstract
The invention discloses a feed-forward satellite television antenna which comprises a metamaterial panel arranged at the back of a feed source. The metamaterial panel comprises a core layer and a reflective plate arranged on one side of the core layer. The core layer comprises at least one laminated layer, each laminated layer comprises a laminated substrate and a plurality of artificial micropore structures arranged on the substrate, refractive indexes of the laminated layers of the core layer are in circular distribution, and the refractive indexes at the position with the same radius are the same, and are reduced gradually along with increase of the radius. Since the antenna with the laminated metamaterial panel substitutes for the conventional parabola antenna, the feed-forward satellite television antenna is easy to manufacture and process and low-cost. The invention further provides a satellite television receiving system with the feed-forward satellite television antenna.
Description
Technical field
The present invention relates to the communications field, more particularly, relate to a kind of feed forward type satellite tv antenna and satellite television receiving system thereof.
Background technology
The satellite earth receiving station that traditional satellite television receiving system is made up of parabolic antenna, feed, tuner, satellite receiver.Parabolic antenna is responsible for satellite-signal to reflex to the feed and tuner that are positioned at focus place.Feed be arrange at the focus place of parabolic antenna one for collecting the loudspeaker of satellite-signal, also known as corrugated horn.Its major function has two: one to be collected by the electromagnetic wave signal that antenna receives, and is transformed into signal voltage, supply high frequency head.Two is carry out polarization conversion to the electromagnetic wave received.Tuner LNB (also known as frequency demultiplier) is that the satellite-signal sent here by feed carries out frequency reducing and then signal amplification is sent to satellite receiver.Generally can be divided into C-band frequency LNB (3.7GHz-4.2GHz, 18-21V) and Ku audio range frequency LNB (10.7GHz-12.75GHz, 12-14V).The workflow of LNB be exactly first satellite high-frequency signals is amplified to hundreds thousand of times afterwards recycle local oscillation circuit high-frequency signals is converted to intermediate frequency 950MHz-2050MHz, be beneficial to the transmission of coaxial cable and the solution mediation work of satellite receiver.Satellite receiver is that the satellite-signal transported by tuner carries out demodulation, demodulates satellite television image or digital signal and audio signal.
During receiving satellite signal, parallel electromagnetic wave is converged on feed after being reflected by parabolic antenna.Usually, the feed that parabolic antenna is corresponding is a horn antenna.
But because the Machining of Curved Surface difficulty of the reflecting surface of parabolic antenna is large, required precision is also high, therefore, make trouble, and cost is higher.
Summary of the invention
Technical problem to be solved by this invention is, for the processing of existing satellite tv antenna not easily, defect that cost is high, provide a kind of and process feed forward type satellite tv antenna that is simple, low cost of manufacture.
The technical solution adopted for the present invention to solve the technical problems is: a kind of feed forward type satellite tv antenna, described feed forward type satellite tv antenna comprises the metamaterial panel being arranged on feed rear, described metamaterial panel comprises core layer and is arranged on the reflecting plate of core layer one side surface, described core layer comprises at least one core layer, the base material that described core layer comprises sheet and the multiple artificial foramen structures be arranged on base material, the rounded distribution of refractive index of described core layer, and the refractive index at same radius place is identical, along with the increase refractive index of radius reduces gradually.
Further, described core layer comprises the identical and core layer be parallel to each other of multiple refraction index profile.
Further, described metamaterial panel also comprises the matching layer being arranged on core layer opposite side, to realize the index matching from air to core layer.
Further, the refractive index of described core layer is with its center for the rounded distribution in the center of circle, and refractive index n (r) distribution of described core layer meets following formula:
Wherein, n (r) represents that in core layer, radius is the refractive index value at r place;
L is the distance that feed arrives the matching layer close with it, or l is the distance that feed arrives core layer;
D is the thickness of core layer,
R represents maximum radius;
N
maxrepresent the refractive index maximum in core layer;
N
minrepresent the refractive index minimum value in core layer.
Further, described matching layer comprises multiple matching layer lamella, and each matching layer lamella has single refractive index, and the refractive index of multiple matching layer lamellas of described matching layer all meets following formula:
Wherein, m represents total number of plies of matching layer, and i represents the numbering of matching layer lamella, wherein, near core layer matching layer lamella be numbered m.
Further, each matching layer lamella described comprises the identical first substrate of material and second substrate, fills air between described first substrate and second substrate.
Further, multiple artificial foramen planforms of each core layer of described core layer are identical, the medium that refractive index is greater than base material is filled with in described multiple artificial foramen structure, multiple artificial foramen structures at same radius place have identical volume, and reduce gradually along with the volume of the increase artificial foramen structure of radius.
Further, multiple artificial foramen planforms of each core layer of described core layer are identical, the medium that refractive index is less than base material is filled with in described multiple artificial foramen structure, multiple artificial foramen structures at same radius place have identical volume, and increase gradually along with the volume of the increase artificial foramen structure of radius.
Further, described artificial foramen structure is cylindrical hole.
According to feed forward type satellite tv antenna of the present invention, instead of traditional parabolic antenna by the metamaterial panel of sheet, manufacture processing and be more prone to, cost is cheaper.
Present invention also offers a kind of satellite television receiving system, comprise feed, tuner and satellite receiver, described satellite television receiving system also comprises above-mentioned feed forward type satellite tv antenna, and described feed forward type satellite tv antenna is arranged on the rear of feed.
Accompanying drawing explanation
Fig. 1 is the structural representation of feed forward type satellite tv antenna of the present invention;
Fig. 2 is the structural representation of the metamaterial unit of a kind of form of the present invention;
Fig. 3 is the refraction index profile schematic diagram of core layer of the present invention;
Fig. 4 is the structural representation of the core layer of a kind of form of the present invention;
Fig. 5 is the structural representation of the core layer of another kind of form of the present invention;
Fig. 6 is the structural representation of matching layer of the present invention.
Embodiment
As shown in Figures 1 to 6, the metamaterial panel 100 being arranged on feed 1 rear is comprised according to feed forward type satellite tv antenna of the present invention, described metamaterial panel 100 comprises core layer 10 and is arranged on the reflecting plate 200 of core layer 10 1 side surface, described core layer 10 comprises at least one core layer 11, the base material 13 that described core layer 11 comprises sheet and the multiple artificial foramen structures 12 be arranged on base material 13, the refractive index of described core layer 11 with its center for the rounded distribution in the center of circle, the refractive index at same radius place is identical, and reduce gradually along with the increase refractive index of radius.In the present invention, feed 1 is arranged on the axis of metamaterial panel, and namely feed overlaps with the axis of metamaterial panel with the line at the center of core layer 11.Feed 1 and metamaterial panel 100 all have stent support, and in figure and not shown support, it is not core of the present invention, adopts traditional supporting way.Feed is preferably horn antenna in addition.Core layer 11 in figure is square, and certainly, also can be other shape, such as cylindrical.In addition, reflecting plate is the metallic reflection plate with smooth surface, such as, can be the copper coin of polishing, aluminium sheet or iron plate etc.
As shown in Figures 1 to 5, described core layer 10 comprises the identical and core layer 11 be parallel to each other of multiple refraction index profile.Multiple core layer 11 fits tightly, each other can be bonding by double faced adhesive tape, or is fixedly connected with by bolt etc.Can also interval be had between two adjacent in addition core layer 11, in interval, fill air or other medium, to improve the performance of core layer.The base material 13 of each core layer 11 can be divided into multiple identical base material unit V, each base material unit V is provided with artificial foramen structure 12, the artificial foramen structure 12 that each base material unit V is corresponding with it forms a metamaterial unit D, and each core layer 11 only has a metamaterial unit D in a thickness direction.Each base material unit V can be identical square, it can be cube, may also be cuboid, the length volume of each base material unit V is not more than 1/5th (being generally 1/10th of incident electromagnetic wave wavelength) of incident electromagnetic wave wavelength, has continuous print electric field and/or magnetic responsiveness to make whole core layer to electromagnetic wave.Under preferable case, the cube of described base material unit V to be the length of side be incident electromagnetic wave wavelength 1/10th.
Known refractive index
wherein μ is relative permeability, and ε is relative dielectric constant, and μ and ε is collectively referred to as electromagnetic parameter.Experiment proves, when electromagnetic wave is by refractive index dielectric material heterogeneous, and can to the large direction deviation (to the metamaterial unit deviation that refractive index is large) of refractive index.Therefore, core layer of the present invention has convergence effect to electromagnetic wave, the electromagnetic wave that satellite sends is first by the first time convergence effect of core layer, through baffle reflection, again by the second time convergence effect of core layer, therefore, the refraction index profile of appropriate design core layer, the electromagnetic wave that satellite can be made to send after first time convergence, baffle reflection and second converge, can converge on feed successively.When the material of base material and the material of filled media are selected, the electromagnetic parameter distribution of Meta Materials inside can be obtained by the arrangement on base material of the shape of designer's pore-creating structure, volume and/or artificial foramen structure, thus design the refractive index of each metamaterial unit.First the electromagnetic parameter spatial distribution (i.e. the electromagnetic parameter of each metamaterial unit) of Meta Materials inside is calculated from the effect required for Meta Materials, the shape of the artificial foramen structure in each metamaterial unit is selected according to the spatial distribution of electromagnetic parameter, volume (having deposited various human pore-creating structured data in computer in advance), the method of exhaustion can be used to the design of each metamaterial unit, such as first select the artificial foramen structure that has given shape, calculate electromagnetic parameter, by the contrast that the result obtained and we are wanted, circulation repeatedly, until till the electromagnetic parameter finding us to want, if have found, the design parameter then completing artificial foramen structure is selected, if do not find, then change a kind of artificial foramen structure of shape, repeat circulation above, until till the electromagnetic parameter finding us to want.If still do not found, then said process also can not stop.That is only have found the artificial foramen structure of the electromagnetic parameter that we need, program just can stop.Because this process is all completed by computer, therefore, seem complicated, in fact can complete soon.
In the present invention, the base material of described core layer is obtained by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material etc.Macromolecular material is available polytetrafluoroethylene, epoxy resin, F4B composite material, FR-4 composite material etc.Such as, the electrical insulating property of polytetrafluoroethylene is very good, therefore can not produce interference to electromagnetic electric field, and have excellent chemical stability, corrosion resistance, long service life.
In the present invention, the mode that described artificial foramen structure can be punched by high temperature sintering, injection moulding, punching press or numerical control is formed on base material.Certainly for the base material of different materials, the generating mode of artificial foramen structure also can be different, such as, when selecting ceramic material as base material, preferably adopts the form of high temperature sintering on base material, generate artificial foramen structure.When selecting macromolecular material as base material, such as polytetrafluoroethylene, epoxy resin, then preferably adopt the form of injection moulding or punching press on base material, generate artificial foramen structure.
Described artificial foramen structure of the present invention can be cylindrical hole, conical bore, round platform hole, trapezoidal hole or square opening one or combination.It can certainly be the hole of other form.The shape of the artificial foramen structure on each metamaterial unit D, can be identical according to different needs, also can be different.Certainly, in order to be more prone to processing and manufacturing, whole Meta Materials, under preferable case, adopts the hole of same shape.
As shown in Figure 1, be the structural representation of the metamaterial panel of first embodiment of the invention, in the present embodiment, described metamaterial panel also comprises the matching layer 20 being arranged on core layer opposite side, to realize the index matching of from air to core layer 10.We know, the refractive index between medium is larger, then, when electromagnetic wave is from a medium incident to another medium, reflect larger, and reflection is large, means the loss of energy, at this time just needs the coupling of refractive index, known refractive index
wherein μ is relative permeability, and ε is relative dielectric constant, and μ and ε is collectively referred to as electromagnetic parameter.We know that the refractive index of air is 1, and therefore, design matching layer like this, the refractive index namely near the side of air and air are substantially identical, and the refractive index near the side of core layer is substantially identical with the core layer refractive index that it connects.Like this, just achieve the index matching from air to core layer, reduce reflection, namely energy loss can reduce greatly, and it is farther that such electromagnetic wave can transmit.
In the present embodiment, as shown in Figures 1 and 3, the refractive index of described core layer 11 is with its center O for the rounded distribution in the center of circle, and refractive index n (r) distribution of described core layer 11 meets following formula:
Wherein, n (r) represents that in core layer, radius is the refractive index value at r place; Also be that in core layer, radius is the refractive index of the metamaterial unit of r; Radius refers to the distance of mid point to the center O (center of circle) of core layer of each base material unit V herein, and the mid point of base material unit V herein, refers to the mid point on the conplane surface of base material unit V and mid point O.
L is the distance of feed 1 to the matching layer 20 close with it;
D is the thickness of core layer,
R represents maximum radius;
N
maxrepresent the refractive index maximum in core layer 11;
N
minrepresent the refractive index minimum value in core layer 11;
By formula (1), the determined core layer 10 of formula (2), can ensure that electromagnetic wave convergence that satellite sends is to feed place.This by computer simulation emulation, or utilizes optical principle can obtain (namely utilizing equivalent optical path to calculate).
In the present embodiment, the thickness of core layer 11 is certain, usually in less than 1/5th of incident electromagnetic wave wavelength X, is preferably 1/10th of incident electromagnetic wave wavelength X.Like this, when designing, if having selected the number of plies of core layer 11, then the thickness d of core layer just determines, therefore, for the feed forward type satellite tv antenna (wavelength is different) of different frequency, by formula (2), we know, by appropriate design (n
max-n
min) value, just can obtain arbitrarily our the feed forward type satellite tv antenna of frequency wanted.Such as, C-band and Ku wave band.The frequency range of C-band is 3400MHz ~ 4200MHz.Frequency 10.7 ~ the 12.75GHz of Ku wave band, wherein can be divided into the frequency ranges such as 10.7 ~ 11.7GHz, 11.7 ~ 12.2GHz, 12.2 ~ 12.75GHz.
As shown in Figure 1, in the present embodiment, described matching layer 20 comprises multiple matching layer lamella 21, and each matching layer lamella 21 has single refractive index, and the refractive index of multiple matching layer lamellas of described matching layer all meets following formula:
Wherein, m represents total number of plies of matching layer, and i represents the numbering of matching layer lamella, wherein, near core layer matching layer lamella be numbered m.As can be seen from formula (4) we, the setting (total number of stories m) of matching layer and the largest refractive index n of core layer
maxwith minimum refractive index n
minthere is direct relation; As i=1, represent the refractive index of the 1st layer, because it will equal the refractive index 1 of air substantially, therefore, as long as n
maxwith n
mindetermine, then can determine total number of stories m.
Matching layer 20 can be that the multiple materials with single refractive index existed by occurring in nature are made, may also be with matching layer as shown in Figure 6, it comprises multiple matching layer lamella 21, each matching layer lamella 21 comprises the identical first substrate of material 22 and second substrate 23, fills air between described first substrate 21 and second substrate 22.By controlling the ratio of the volume of air and the volume of matching layer lamella 21, refractive index can be realized from 1 (refractive index of air) to the change of the refractive index of first substrate, thus can the refractive index of each matching layer lamella of appropriate design, realize the index matching from air to core layer.
Fig. 4 is a kind of core layer 10 of form, multiple artificial foramen structure 12 shapes of each core layer 11 of described core layer are identical, for the cylindrical hole shown in Fig. 2, and the axis of each cylindrical hole is through the mid point of corresponding base material unit V, the medium that refractive index is greater than base material 13 is filled with in described multiple artificial foramen structure, multiple artificial foramen structures at same radius place have identical volume, along with the volume of the increase artificial foramen structure 12 of radius reduces gradually.Owing to being filled with the medium that refractive index is greater than base material 13 in artificial foramen structure 12, therefore artificial foramen structural volume is larger, then the medium of filling is more, and the refractive index of its correspondence is larger, therefore, the distribution of refraction index profile by formula (1) of core layer can be realized by this mode.
Fig. 5 is the core layer 10 of another kind of form, multiple artificial foramen structure 12 shapes of each core layer 11 of described core layer are identical, the medium that refractive index is less than base material 13 is filled with in described multiple artificial foramen structure 12, multiple artificial foramen structures at same radius place have identical volume, and increase gradually along with the volume of the increase artificial foramen structure of radius.Owing to being filled with the medium that refractive index is less than base material in artificial foramen structure 12, therefore artificial foramen structural volume is larger, the medium of then filling is more, the refractive index of its correspondence is less on the contrary, therefore, the distribution of refraction index profile by formula (1) of core layer also can be realized by this mode.
Fig. 4 and Fig. 5 is from the appearance identical, refraction index profile is also identical, just it realizes the mode different (filled media is different) of above-mentioned refraction index profile, core layer 10 in Fig. 4 and Fig. 5 is the structure of four layers, here just schematically, according to different needs (different incident electromagnetic waves), and different designs needs, and can have the different numbers of plies.
Certainly, core layer 11 is not limited to above-mentioned two kinds of forms, such as, everyone pore-creating structure can be divided into the identical cell orifice of several volumes, and the volume of the artificial foramen structure controlled on each metamaterial unit D by the quantity of the cell orifice on each base material unit V also can realize identical object.Again such as, core layer 11 can be following form, that is, same core layer all people pore-creating structural volume is identical, but the refractive index of its medium of filling corresponds to formula (1).
The present invention also has the second embodiment, and the difference of the second embodiment and the first embodiment is that the l in refractive index n (r) distribution formula of core layer 11 represents the distance (in first embodiment l represent feed arrive the distance of with it close matching layer) of feed to core layer.
In addition, the present invention also provides and present invention also offers a kind of satellite television receiving system, comprise feed, tuner and satellite receiver, described satellite television receiving system also comprises above-mentioned feed forward type satellite tv antenna, and described feed forward type satellite tv antenna is arranged on the rear of feed.
Feed, tuner and satellite receiver are existing technology, no longer state herein.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (7)
1. a feed forward type satellite tv antenna, it is characterized in that, described feed forward type satellite tv antenna comprises the metamaterial panel being arranged on feed rear, described metamaterial panel comprises core layer and is arranged on the reflecting plate of core layer one side surface, described core layer comprises at least one core layer, the base material that described core layer comprises sheet and the multiple artificial foramen structures be arranged on base material, the rounded distribution of refractive index of described core layer, and the refractive index at same radius place is identical, along with the increase refractive index of radius reduces gradually, described core layer comprises the identical and core layer be parallel to each other of multiple refraction index profile, described metamaterial panel also comprises the matching layer being arranged on core layer opposite side, to realize the index matching from air to core layer, the refractive index of described core layer with its center for the rounded distribution in the center of circle, refractive index n (r) distribution of described core layer meets following formula:
Wherein, n (r) represents that in core layer, radius is the refractive index value at r place;
L is the distance that feed arrives the matching layer close with it, or l is the distance that feed arrives core layer;
D is the thickness of core layer,
R represents maximum radius;
N
maxrepresent the refractive index maximum in core layer;
N
minrepresent the refractive index minimum value in core layer.
2. feed forward type satellite tv antenna according to claim 1, it is characterized in that, described matching layer comprises multiple matching layer lamella, and each matching layer lamella has single refractive index, and the refractive index of multiple matching layer lamellas of described matching layer all meets following formula:
Wherein, m represents total number of plies of matching layer, and i represents the numbering of matching layer lamella, wherein, near core layer matching layer lamella be numbered m.
3. feed forward type satellite tv antenna according to claim 2, is characterized in that, each matching layer lamella described comprises the identical first substrate of material and second substrate, fills air between described first substrate and second substrate.
4. the feed forward type satellite tv antenna according to claims 1 to 3 any one, it is characterized in that, multiple artificial foramen planforms of each core layer of described core layer are identical, the medium that refractive index is greater than base material is filled with in described multiple artificial foramen structure, multiple artificial foramen structures at same radius place have identical volume, and reduce gradually along with the volume of the increase artificial foramen structure of radius.
5. the feed forward type satellite tv antenna according to claims 1 to 3 any one, it is characterized in that, multiple artificial foramen planforms of each core layer of described core layer are identical, the medium that refractive index is less than base material is filled with in described multiple artificial foramen structure, multiple artificial foramen structures at same radius place have identical volume, and increase gradually along with the volume of the increase artificial foramen structure of radius.
6. feed forward type satellite tv antenna according to claim 1, is characterized in that, described artificial foramen structure is cylindrical hole.
7. a satellite television receiving system, comprise feed, tuner and satellite receiver, it is characterized in that, described satellite television receiving system also comprises the feed forward type satellite tv antenna as described in claim 1 to 6 any one, and described feed forward type satellite tv antenna is arranged on the rear of feed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110210205.9A CN102904033B (en) | 2011-07-26 | 2011-07-26 | Feed-forward satellite television antenna and satellite television receiving system thereof |
| PCT/CN2011/082429 WO2013013457A1 (en) | 2011-07-26 | 2011-11-18 | Front feed satellite television antenna and satellite television receiver system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110210205.9A CN102904033B (en) | 2011-07-26 | 2011-07-26 | Feed-forward satellite television antenna and satellite television receiving system thereof |
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| CN102904033A CN102904033A (en) | 2013-01-30 |
| CN102904033B true CN102904033B (en) | 2015-03-11 |
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| CN1658433A (en) * | 2004-12-30 | 2005-08-24 | 东南大学 | Variable-polarization microstrip reflectarray antenna |
| CN101604034A (en) * | 2009-07-10 | 2009-12-16 | 中国科学院光电技术研究所 | A kind of metal structural lens with sub-wavelength and high refractive index medium holes |
| CN101699659A (en) * | 2009-11-04 | 2010-04-28 | 东南大学 | Lens antenna |
| CN101867094A (en) * | 2010-05-02 | 2010-10-20 | 兰州大学 | Focusing panel antenna |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100553030C (en) * | 2007-11-02 | 2009-10-21 | 清华大学 | Electric field-tunable negative magnetic permeability part and preparation method based on ferroelectric ceramic grain |
| US7570432B1 (en) * | 2008-02-07 | 2009-08-04 | Toyota Motor Engineering & Manufacturing North America, Inc. | Metamaterial gradient index lens |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1658433A (en) * | 2004-12-30 | 2005-08-24 | 东南大学 | Variable-polarization microstrip reflectarray antenna |
| CN101604034A (en) * | 2009-07-10 | 2009-12-16 | 中国科学院光电技术研究所 | A kind of metal structural lens with sub-wavelength and high refractive index medium holes |
| CN101699659A (en) * | 2009-11-04 | 2010-04-28 | 东南大学 | Lens antenna |
| CN101867094A (en) * | 2010-05-02 | 2010-10-20 | 兰州大学 | Focusing panel antenna |
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Effective date of registration: 20160330 Address after: 518057 Guangdong City, Nanshan District province high tech Zone in the middle of a high tech building, building No. 2, No. 9, building Patentee after: Shenzhen Guangqi Innovative Technology Co., Ltd. Address before: 518000 Nanshan District City, Guangdong province high tech Zone in the middle of a high tech building, No. 9 software building Patentee before: Shenzhen Kuang-Chi Institute of Advanced Technology Patentee before: Shenzhen Kuang-Chi Innovation Technology Co., Ltd. |