CN104466360A - Coated antenna device - Google Patents
Coated antenna device Download PDFInfo
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- CN104466360A CN104466360A CN201410690983.6A CN201410690983A CN104466360A CN 104466360 A CN104466360 A CN 104466360A CN 201410690983 A CN201410690983 A CN 201410690983A CN 104466360 A CN104466360 A CN 104466360A
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- coating
- circular polarization
- paster
- polarization radiation
- antenna assembly
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Abstract
The invention discloses a coated antenna device. The coated antenna device comprises a circular polarization radiation paster, impedance conversion lines, a micro-strip feeder line, a dielectric substrate, an earth plate and a frequency selective surface coating. The circular polarization radiation paster is arranged in the center of the upper surface of the dielectric substrate in an etching mode and connected with the micro-strip feeder line through the impedance conversion lines. The earth plate is arranged on the lower surface of the dielectric substrate in an etching mode, and the frequency selective surface coating is located over the circular polarization radiation paster. The length of the edge of the square circular polarization radiation paster ranges from 13 mm to 15.5 mm, the paster is connected with the two impedance conversion lines, and the joints of the paster and the two impedance conversion lines are located on the different edges of the paster. Sixty-four square metal units are arranged on the lower surface of the frequency selective surface coating in an etching mode and are evenly distributed in an 8*8 array mode, and the area of the square metal units in each line gradually becomes small. According to the coated antenna device, the gain of an antenna can be improved, the sidelobe of the antenna can be reduced, and the performance of the antenna can be improved.
Description
Technical field
The present invention relates to antenna technical field, particularly relate to a kind of coating antenna assembly.
Background technology
Electronic charging system without parking (ETC, Electronic Toll Collection) be the AS utilizing the equipment of the new and high technologies such as wireless communication technology, automatic identification technology, image processing techniques, computer networking technology and software to form, can automatically collect road expense to realize vehicle without the need to stopping.
ETC system is made up of a few major parts such as roadside read-write equipment RSU, board units OBU, ground induction coil, automatic rail machine, wagon detector, toll collection, audit systems.ETC system is intercomed mutually and information exchange by roadside unit and board units, to reach the automatic identification to vehicle, and automatically from the specified account of this user, deducts pass cost, thus realize the system of automatic charging.The basic procedure of ETC system is: in preset range, arrange the device such as flap, railing restriction car speed; When vehicle sails expressway access place into, ETC system records the vehicle of this car, licence plate, entry time and place automatically by the transportation card in vehicle carried electronic label; Read these data to this system during exit and generate simultaneously and need payment amount, in transportation card, bales catch removes rapidly.
Along with the extensive use of ETC system at highway and the issue of National Electrical charge Dedicated Short Range Communications, standard GB/T20851-2007, the performance of the RSU antenna in ETC system also needs development, improves and improve.RSU antenna in existing ETC system mainly adopts the form of micro-strip array antenna, comes, to antenna element group battle array, antenna directivity to be strengthened by suitable feeding network.Current most of producer adopts the aerial array of Unit eight, also has part manufacturer to adopt 16 cellular arraies.But adopt microstrip array form not only to need to design complicated feeding network, and main lobe wave beam is wider, minor level is higher, easily causes monkey chatter problem.
Summary of the invention
The embodiment of the present invention provides a kind of coating antenna assembly, simplifies the design of existing antenna feeding network, and improve the gain of antenna, reduce the secondary lobe of antenna, improve the performance of antenna, the interference between adjacent lane improves.
The embodiment of the present invention provides a kind of coating antenna assembly, it is characterized in that, comprising: circular polarization radiation paster, impedance transformation line, microstrip feed line, medium substrate, ground plate and frequency-selective surfaces coating;
Described circular polarization radiation paster is etched in the center of described medium substrate upper surface, and is connected with described microstrip feed line by described impedance transformation line; Described ground plate is etched in the lower surface of described medium substrate, and described frequency-selective surfaces coating is positioned at directly over described circular polarization radiation paster;
Described circular polarization radiation paster is square, and the described square length of side is 13mm-15.5mm, and described paster is connected with two impedance transformation lines respectively, and described paster and the tie point of two impedance transformation lines lay respectively on described square different limit;
The lower surface of described frequency-selective surfaces coating etches 64 square metal unit, and described square metal unit is that 8 × 8 arrays are evenly arranged, and the described square metal cellar area of every a line diminishes gradually.
Further, in described square metal unit, the length of side of the unit that area is maximum is 13mm-15mm.
Further, the characteristic impedance of described impedance transformation line is 70 Ω ~ 90 Ω.
Further, the lower surface of described frequency-selective surfaces coating is supported on the top of described circular polarization radiation paster by insulating support.
Further again, described medium substrate and described frequency-selective surfaces coating all adopt polytetrafluoroethylmaterial material.
A kind of coating antenna assembly that the embodiment of the present invention provides, have employed a circular polarization radiation paster, does not need to design complicated feeding network, simplifies design difficulty.Have employed frequency-selective surfaces coating and ground plate, constitute F-P resonant cavity, improve gain; Resonant cavity to transmitted through electromagnetic wave be convergence effect, sharpening wave beam, inhibits secondary lobe, avoids energy leakage that aerial radiation goes out to adjacent lane, can effectively solve monkey chatter problem.The clad surface etching square metal unit that the square array adopted evenly is arranged, the area one dimension gradual change of square metal unit, high directivity, structure is simple, easily produces and adjustment.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the embodiment of coating antenna assembly provided by the invention;
Fig. 2 is the structural representation of the circular polarization radiation paster of the embodiment of coating antenna assembly provided by the invention;
Fig. 3 is the frequency-selective surfaces coat structure schematic diagram of the embodiment of coating antenna assembly provided by the invention;
Fig. 4 is the input reflection coefficient analogous diagram of the embodiment of coating antenna assembly provided by the invention;
Fig. 5 is the gain radiation directional diagram of the embodiment of coating antenna assembly provided by the invention;
Fig. 6 is the axial ratio analogous diagram of the embodiment of coating antenna assembly provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1-3, the structure of the embodiment of coating antenna assembly provided by the invention is described in detail.
See Fig. 1, the overall structure schematic diagram of the embodiment of coating antenna assembly provided by the invention, comprises circular polarization radiation paster 1, impedance transformation line 2, impedance transformation line 9, microstrip feed line 3, microstrip feed line 10, medium substrate 4, ground plate 5, the square metal unit 7 of frequency-selective surfaces coating 6, evenly two-dimension periodic arrangement and insulating support 8;
Described circular polarization radiation paster 1 is etched in the center of described medium substrate 4 upper surface, and is connected with described microstrip feed line 3 by described impedance transformation line 2, is connected with described microstrip feed line 10 by described impedance transformation line 9; Described ground plate 5 is etched in the lower surface of described medium substrate 4, described frequency-selective surfaces coating 6 is positioned at directly over described circular polarization radiation paster 1, make to form F-P resonant cavity between described frequency-selective surfaces coating 6 and described ground plate 5,6 lower surfaces of described frequency-selective surfaces coating are supported on the top of described circular polarization radiation paster 1 by insulating support 8.
Described impedance transformation line 2, its length is 9mm, and width is 1.2mm.Impedance transformation line one end connects with circular polarization radiation paster 1, by the real part Z of its input impedance
0transform to 50 ohm, the other end connects with microstrip feed line 3, realizes impedance matching.
Described impedance transformation line 9, its length is 9mm, and width is 1.2mm.Impedance transformation line one end connects with circular polarization radiation paster 1, by the real part Z of its input impedance
0transform to 50 ohm, the other end connects with microstrip feed line 10, realizes impedance matching.
Described frequency-selective surfaces coating 6, is supported on directly over medium substrate 4 by four plastic stents 8, forms F-P resonant cavity with the ground plate 5 of medium substrate 4 lower surface.
Preferably, the characteristic impedance of described impedance transformation line 2 and impedance transformation line 9 is 70 Ω ~ 90 Ω.
In the middle of concrete enforcement, described medium substrate 4 all adopts polytetrafluoroethylmaterial material with described frequency-selective surfaces coating 6.Described medium substrate 4 also adopts other materials to make with described frequency-selective surfaces coating 6.
See Fig. 2, it is the structural representation of the circular polarization radiation paster of the embodiment of coating antenna assembly provided by the invention.
Circular polarization can be produced for making radiation patch, the circular polarization radiation paster 1 of the coating antenna assembly that the embodiment of the present invention provides is connected with two impedance transformation lines, there are two distributing points, two degenerate modes that described circular polarization radiation paster 1 is produced produce and are separated, two degenerate modes can be made to produce 90 ° of phase differences, realize circular polarization.With reference to Fig. 2, the length of side a=14.1mm of the described circular polarization radiation paster 1 in the embodiment of the present invention, radiation patch is copper material.
Optionally, the length of side of described circular polarization radiation paster is 13mm-15.5mm;
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, the length of side of described circular polarization radiation paster can be set as other numerical value, these improvement are also considered as protection scope of the present invention.
See Fig. 3, the frequency-selective surfaces coat structure schematic diagram of the embodiment of coating antenna assembly provided by the invention.
The lower surface of described frequency-selective surfaces coating 6 etches 64 square metal unit 7, and described square metal unit 7 is that 8 × 8 arrays are evenly arranged, and the area of the described square metal unit 7 of every a line diminishes gradually.Its parameter comprises length of side d and cycle t, adjusts reflection coefficient amplitude p and reflected phase will that these two parameters can change frequency-selective surfaces coating 6.When reflection coefficient amplitude p is between 0.89 ~ 0.93, the gain of antenna can be greatly enhanced, and when p continues to increase, the gain of antenna can sharply decline.
In the middle of concrete enforcement, in described square metal unit, the length of side of the unit that area is maximum is 13mm-15mm.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, the length of side of unit maximum for area in described square metal unit can be set as other numerical value, these improvement are also considered as protection scope of the present invention.
See Fig. 4-6, the simulated effect of the embodiment of coating antenna assembly provided by the invention is described in detail.
See Fig. 4, it is the input reflection coefficient analogous diagram of the embodiment of coating antenna assembly provided by the invention.
In Fig. 4, abscissa is the frequency of antenna, and ordinate represents antenna reflection coefficient at different frequencies, and reflection coefficient reflects the ability of energy on this day line absorption feeder line.As seen from Figure 4, antenna is less than-10dB at 5.75-5.9GHz passband reflection coefficient, and coupling is good.
See Fig. 5, it is the gain radiation directional diagram of the embodiment of coating antenna assembly provided by the invention.
In Fig. 5, abscissa represents the angle of radiation of antenna, and ordinate represents the gain of antenna under different angle of radiation.As shown in Figure 5, this Antenna Operation is at 5.8GHz, and the maximum gain of antenna reaches 18dB, and minor level is-16dB, meets the requirement of ETC system to gain.
See Fig. 6, it is the axial ratio analogous diagram of the embodiment of coating antenna assembly provided by the invention.
In Fig. 6, abscissa represents the angle of radiation of antenna, and ordinate represents the axial ratio of the antenna that different angle of radiation is corresponding.As seen from Figure 6, this Antenna Operation is at 5.8GHz, and the angle that its horizontal plane axial ratio is less than 3dB is about 50 °, and the angle that vertical plane axial ratio is less than 3dB is about 60 °, meets the requirement of ETC system to polarization.
A kind of coating antenna assembly that the embodiment of the present invention provides, have employed a circular polarization radiation paster, does not need to design complicated feeding network, simplifies design difficulty.Have employed frequency-selective surfaces coating and ground plate, constitute F-P resonant cavity, improve the gain of antenna; Resonant cavity to transmitted through electromagnetic wave be convergence effect, sharpening wave beam, inhibits secondary lobe, avoids energy leakage that aerial radiation goes out to contiguous track, can effectively solve monkey chatter problem.The clad surface etching square metal unit that the square array adopted evenly is arranged, the area one dimension gradual change of square metal unit, structure is simple, is easy to industrialization and produces, and is easy to produce and adjustment.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (5)
1. a coating antenna assembly, is characterized in that, comprising: circular polarization radiation paster, impedance transformation line, microstrip feed line, medium substrate, ground plate and frequency-selective surfaces coating;
Described circular polarization radiation paster is etched in the center of described medium substrate upper surface, and is connected with described microstrip feed line by described impedance transformation line; Described ground plate is etched in the lower surface of described medium substrate, and described frequency-selective surfaces coating is positioned at directly over described circular polarization radiation paster;
Described circular polarization radiation paster is square, and the described square length of side is 13mm-15.5mm, and described paster is connected with two impedance transformation lines respectively, and described paster and the tie point of two impedance transformation lines lay respectively on described square different limit;
The lower surface of described frequency-selective surfaces coating etches 64 square metal unit, and described square metal unit is that 8 × 8 arrays are evenly arranged, and the described square metal cellar area of every a line diminishes gradually.
2. coating antenna assembly as claimed in claim 1, is characterized in that: in described square metal unit, the length of side of the unit that area is maximum is 13mm-15mm.
3. coating antenna assembly as claimed in claim 1, is characterized in that: the characteristic impedance of described impedance transformation line is 70 Ω ~ 90 Ω.
4. coating antenna assembly as claimed in claim 1, is characterized in that: the lower surface of described frequency-selective surfaces coating is supported on the top of described circular polarization radiation paster by insulating support.
5. coating antenna assembly as claimed in claim 1, is characterized in that: described medium substrate and described frequency-selective surfaces coating all adopt polytetrafluoroethylmaterial material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410690983.6A CN104466360A (en) | 2014-11-25 | 2014-11-25 | Coated antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410690983.6A CN104466360A (en) | 2014-11-25 | 2014-11-25 | Coated antenna device |
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| Publication Number | Publication Date |
|---|---|
| CN104466360A true CN104466360A (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410690983.6A Pending CN104466360A (en) | 2014-11-25 | 2014-11-25 | Coated antenna device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106044702A (en) * | 2016-04-29 | 2016-10-26 | 电子科技大学 | An etching and surface material increasing composite processing device and a method of performing silicon substrate patch antenna processing by utilizing the device |
| CN108767493A (en) * | 2018-05-31 | 2018-11-06 | 西安电子科技大学 | Two dimensional beam deflects Fabry-Perot cavity antenna |
| CN110808461A (en) * | 2019-11-22 | 2020-02-18 | 东南大学 | Low-profile holographic imaging antenna based on Fabry-Perot resonant cavity type structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003012919A1 (en) * | 2001-07-26 | 2003-02-13 | E-Tenna Corporation | Reduced weight artificial dielectric antennas |
| CN102544722A (en) * | 2012-01-04 | 2012-07-04 | 电子科技大学 | Polarization reconfigurable high-gain panel antenna |
| CN103354304A (en) * | 2013-06-13 | 2013-10-16 | 西安电子科技大学 | Coated antenna for microwave reader-writer of ETC (electronic toll collection) system |
-
2014
- 2014-11-25 CN CN201410690983.6A patent/CN104466360A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003012919A1 (en) * | 2001-07-26 | 2003-02-13 | E-Tenna Corporation | Reduced weight artificial dielectric antennas |
| CN102544722A (en) * | 2012-01-04 | 2012-07-04 | 电子科技大学 | Polarization reconfigurable high-gain panel antenna |
| CN103354304A (en) * | 2013-06-13 | 2013-10-16 | 西安电子科技大学 | Coated antenna for microwave reader-writer of ETC (electronic toll collection) system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106044702A (en) * | 2016-04-29 | 2016-10-26 | 电子科技大学 | An etching and surface material increasing composite processing device and a method of performing silicon substrate patch antenna processing by utilizing the device |
| CN108767493A (en) * | 2018-05-31 | 2018-11-06 | 西安电子科技大学 | Two dimensional beam deflects Fabry-Perot cavity antenna |
| CN110808461A (en) * | 2019-11-22 | 2020-02-18 | 东南大学 | Low-profile holographic imaging antenna based on Fabry-Perot resonant cavity type structure |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |
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| WD01 | Invention patent application deemed withdrawn after publication |