CN1815810A - Microband antenna and producing method - Google Patents
Microband antenna and producing method Download PDFInfo
- Publication number
- CN1815810A CN1815810A CN 200510004983 CN200510004983A CN1815810A CN 1815810 A CN1815810 A CN 1815810A CN 200510004983 CN200510004983 CN 200510004983 CN 200510004983 A CN200510004983 A CN 200510004983A CN 1815810 A CN1815810 A CN 1815810A
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- radiant panel
- antenna
- floor
- connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Waveguide Aerials (AREA)
Abstract
The microstrip antenna includes a floor, a radial plate, at least a connector. There is slot in U shape on the radial plate in isoceles triangle. Opening of the slot in U shape is faced to the base line. Through feeding point setup on the radial plate, the connector can be connected to the radial plate. Through the connector, excitation under floor can excite the radial plate to form electromagnetic radiation. A first group of holes and a second group of holes are setup on the floor. The first group of holes can enhance principal wave, and the second group of holes can weaken other secondary waves except principal wave. The invention can improve bandwidth of antenna, reduces cross coupling between units of antenna, and raise capabilities of antenna.
Description
Technical field
The present invention relates to a kind of microstrip antenna, relate in particular to and have the damaged microstrip antenna that shows structure on a kind of floor.
Background technology
In many electronic equipments such as wireless telecommunications, radar, electronic navigation and electronic countermeasures, require day by day to adopt little, the lightweight antenna of volume, so microstrip antenna also becomes the focus of antenna research gradually.The microstrip antenna at initial stage, its radiant panel is mainly rectangle or circle, has narrow bandwidth, the shortcoming that power is low.In order to improve the performance of antenna, the bandwidth of broadening antenna, people have carried out a lot of effort.
A kind of scheme is that radiant panel is leg-of-mutton microstrip antenna.Because triangular microstrip antennas physical dimension compactness, less than structures such as rectangles, and also broad of its spatial bandwidth (HPBW).Therefore its bandwidth of triangle antenna can, obtain using widely in multiple antenna from a few percent broadening to 18% of common microstrip antenna.Yet in broadband connections, electronic countermeasures and wideband radar antenna system, the triangle antenna still can not satisfy the demands.
In order further to improve the performance of antenna, people have proposed a kind of passing through and on the radiant panel that becomes isosceles triangle " U " shape groove have been set, and the opening that makes this " U " shape groove also can significantly improve the performance of antenna towards leg-of-mutton base.
Yet no matter how the parameters such as shape of radiant panel change, owing on the floor, except the required main ripple of radiation, also have the subwave of other high order simultaneously, and the energy that subwave consumed belongs to loss fully for radiation.The existence of this subwave has reduced the beamwidth of antenna greatly, has reduced the performance of antenna.
(Defect Ground Structure is to propose in the field of solid-state physics DGS) to the defect surfaces structure the earliest.In relating to optics and microwave regime, in the planar circuit of little band and co-planar waveguide (CPW), its aperiodic structure generally just is called defect surfaces structure DGS at present.The defect surfaces structure can improve the performance of microwave circuit resonant cavity, at optics and microwave regime certain application is arranged.
Summary of the invention
Technical problem to be solved by this invention is: a kind of microstrip antenna and preparation method thereof is provided, can improves the bandwidth of antenna, reduce the mutual coupling between antenna element.
According to a kind of microstrip antenna provided by the invention, comprising: a floor; A radiant panel; Described radiant panel is an isosceles triangle, and has " U " shape groove on this radiant panel, and the opening that is somebody's turn to do " U " shape groove is towards leg-of-mutton base; A connector, this connector is connected to radiant panel by the distributing point that is arranged on the radiant panel; Under the floor, can be activated to radiant panel, form electromagnetic radiation by this connector;
Wherein: described floor comprises plural breach and is positioned on the floor edge or outside corresponding to the position of radiant panel, and the distance between the described breach be essentially this antenna master wave-wave long 1/2nd.
According to a kind of method of making microstrip antenna provided by the invention, comprise the steps:
A floor is provided;
A radiant panel is provided; Described radiant panel is an isosceles triangle, and has " U " shape groove on this radiant panel, and the opening that is somebody's turn to do " U " shape groove is towards leg-of-mutton base;
At least one connector is provided, and this connector is connected to radiant panel by the distributing point that is arranged on the radiant panel; Under the floor, can be activated to radiant panel, form electromagnetic radiation by this connector;
Wherein: described floor comprises plural breach and is positioned on the floor edge or outside corresponding to the position of radiant panel, and the distance between the described breach be essentially this antenna master wave-wave long 1/2nd.
Theoretically speaking, owing to adopt the damaged structure of substrate in a unit cycle, the size of antenna element is less.Damaged structure is on the base plate of antenna, and is simple in structure, easy to process, simultaneously can weight reduction.This antenna form, its impedance bandwidth can reach 21%, and half-power bandwidth is greater than 90 °, when forming antenna array, can utilize the damaged STRUCTURE DEPRESSION surface wave of substrate, reduce the mutual coupling between antenna element, improve the efficient of antenna and secondary lobe, the raising standing-wave ratio bandwidth of reduction antenna.
For dual polarized antenna, according to law of conservation of energy, if subwave is weakened, its energy will be added in the main ripple, thereby main ripple is further strengthened, and can improve the bandwidth of antenna significantly.The present invention is by two groups of holes on the floor, not only solved the unserviceable problem of inferior wave energy,, made defect surfaces structure DGS to have occurred on the floor simultaneously because these two groups of holes, reduce the mutual coupling between antenna element, improve the efficient of antenna and secondary lobe, the raising standing-wave ratio bandwidth of reduction antenna.The DGS structure is arranged on the metal floor as the antenna floor, and is simple in structure, easy to process, is easy to produce in batches, simultaneously can weight reduction.Because adopt the defect surfaces structure (DGS) in a unit cycle, the size of antenna element is also less.
By hereinafter with reference to accompanying drawing to description and claim that the present invention did, other purpose of the present invention and achievement will be apparent, and can comprehensive understanding be arranged to the present invention.
Description of drawings
Fig. 1 is according to first embodiment of the invention single polarization microstrip antenna structure front view.
Fig. 2 is according to first embodiment of the invention single polarization microstrip antenna structure rearview.
Fig. 3 is according to first embodiment of the invention single polarization microstrip antenna structure left view.
Fig. 4 is the structure cutaway view according to first embodiment of the invention single polarization microstrip antenna.
Fig. 5 is the antenna pattern according to first embodiment of the invention single polarization microstrip antenna.
Fig. 6 is the standing wave test curve figure according to first embodiment of the invention single polarization microstrip antenna.
Fig. 7 is the front view according to the dual polarization triangle microstrip antenna structure of second embodiment of the invention.
Fig. 8 is the rearview according to the dual polarization triangle microstrip antenna structure of second embodiment of the invention.
Fig. 9 is the left view according to the dual polarization triangle microstrip antenna structure of second embodiment of the invention.
Figure 10 is the cutaway view according to the dual polarization triangle microstrip antenna structure of second embodiment of the invention.
Figure 11 is according to the dual polarization triangle microstrip antenna port A of second embodiment of the invention and the return loss plot figure of port B.
Figure 12 isolates curve chart according to the two-port of the dual polarization triangle microstrip antenna port A of second embodiment of the invention and port B.
Figure 13 is the H face directional diagram curve chart according to the dual polarization triangle microstrip antenna port A of second embodiment of the invention.
Figure 14 is the E face directional diagram curve chart according to the dual polarization triangle microstrip antenna port B of second embodiment of the invention.
Figure 15 is the front view according to the rectangular microstrip antenna structure of third embodiment of the invention.
Figure 16 is the rearview according to the rectangular microstrip antenna structure of third embodiment of the invention.
In all above-mentioned accompanying drawings, identical label represents to have identical, similar or corresponding feature or function.
Embodiment
Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail by specific embodiment.
With reference to figure 1, the single polarization triangle microstrip antenna of first embodiment of the invention comprises: a metal floor 1; A substrate 3, it is positioned at the top of metal floor 1, be arranged in parallel with metal floor 1; A leg-of-mutton metal patch 2, it is arranged on the upper surface of substrate 3; A distributing point 12 is positioned at leg-of-mutton center, is used for externally being electrically connected, with excitation metal patch 2, radiated electromagnetic wave.
Leg-of-mutton metal patch 2 is the radiant panel of microwave antenna.According to different application, radiant panel of the present invention also can have multiple set-up mode.For example, this radiant panel can be the sheet metal of a self-supporting, and needn't comprise a substrate.Can certainly adopt shown in Figure 1 on a substrate, adopt adhere to, deposition, printing and edge be with modes such as screw are fixing, forms radiant panel.Same, floor of the present invention also can be sheet metal or the employing and the similar mode of radiant panel of a self-supporting, is formed on the substrate.
Especially, triangle metal paster 2 is isosceles triangle and is provided with " U " shape groove 11 on triangle metal paster 2, is somebody's turn to do the triangle base of the opening of " U " shape groove 11 towards triangle metal paster 2.
With reference to figure 2, can see that four set circular holes 21 are connected required power feed hole 5 with connector on the floor of triangle microstrip antenna of the embodiment of the invention with distributing point.Generally speaking, the hole 21 that is used for strengthening main ripple should be positioned at the edge of the projecting figure of the more weak radiant panel of field intensity, perhaps is positioned at outside the projecting figure, and the spacing between the circular hole is the wavelength of main ripple.In order to strengthen main ripple, the diameter in first group of hole is generally the integral multiple of main ripple half-wavelength.If the diameter in hole is other sizes near the integral multiple of half-wavelength, its effect of strengthening main ripple can weaken.The breach of the present invention on base plate, circular hole not necessarily also can other shapes or narrow slit.
With reference to figure 3, can see that the first embodiment of the present invention also comprises a coaxial connector 5.
With reference to figure 4, the inner core 51 of coaxial connector 5 passes substrate 3 and is connected to metal patch 2, and the outer core 52 of coaxial connector is connected to metal floor 1.
With reference to figure 3 and Fig. 4, between floor 1 and substrate 3, also has one deck expanded material piece 4 as can be seen.Expanded material piece 4 mainly plays fixing and insulation.Because the support of expanded material piece 4 can be that antenna of the present invention is more firm, and is not fragile.
Generally speaking, expanded material piece 4 is all selected dielectric constant and the approaching material of air, as foaming polyphenyl alkene plastics.If the dielectric constant of the expanded material piece of selecting 4 is not approaching with air, then possibly according to the distance between its dielectric constant adjustment antenna floor and the radiant panel.
Certainly, also can support between floor of the present invention and the radiant panel with plastic screw, fixing and without the expanded material piece of monoblock.Perhaps under less demanding situation, also can adopt the connector of band supporting role to solve problem fixing and that support.
The foregoing description adopts the damaged structure of substrate in a unit cycle, and the size of antenna element is less.The damaged structure of substrate is on the base plate of antenna, and is simple in structure, easy to process, simultaneously can weight reduction.When forming antenna array, can utilize the damaged STRUCTURE DEPRESSION surface wave of substrate, reduce the mutual coupling between antenna element, improve the efficient of antenna and secondary lobe, the raising standing-wave ratio bandwidth of reduction antenna.
Shown in Figure 5 is the antenna pattern of first embodiment of the invention single polarization microstrip antenna.As can be seen from the figure, the secondary lobe of antenna of the present invention is lowered.
Shown in Figure 6 is the standing wave test curve figure of first embodiment of the invention single polarization microstrip antenna.As can be seen from the figure, antenna standing wave ratio bandwidth of the present invention has obtained significant broadening.
Following description will further describe technical scheme of the present invention by second embodiment of a concrete dual polarization triangle microstrip antenna.Constitute because double polarized micro strip antenna is the microstrip antenna by two single polarizations, in spatial field, it is to have made up+45 ° and-45 ° of two antenna that the consequent pole direction is mutually orthogonal.Therefore, to those skilled in the art, the description of the dual polarization triangle microstrip antenna below the present invention, can realize the microstrip antenna of a single polarization fully, its scheme is also among the scope that claim of the present invention contained.
With reference to figure 7, the dual polarization triangle microstrip antenna of second embodiment of the invention comprises: a metal floor 1; A substrate 3, it is positioned at the top of metal floor 1, be arranged in parallel with metal floor 1; A leg-of-mutton metal patch 2, it is arranged on the upper surface of substrate 3; First distributing point 21 and second distributing point 22 are used for externally being electrically connected, with excitation metal patch 2, radiated electromagnetic wave.
With reference to figure 8, the rearview of the dual polarization triangle microstrip antenna of second embodiment of the invention can see that two groups of set holes are connected required power feed hole with connector on the floor of triangle microstrip antenna of the embodiment of the invention with distributing point.As Reference numeral 11 indications is first group of hole, and its position is used for strengthening main ripple in the position of triangle metal paster 2 on three summits of the orthographic projection of metal floor 1.The diameter in first group of hole is generally the integral multiple of main ripple half-wavelength.For embodiment shown in Figure 2, the wavelength of its main ripple is 0.25 of hole 11 diameters, i.e. λ=0.25D.If the diameter in hole is other sizes near the integral multiple of half-wavelength, its effect of strengthening main ripple can weaken.
The effect in second group of hole of the present invention is to eliminate subwave.For radiating antenna, the subwave on the floor is more little, and the effect of antenna is good more, and therefore the position in second group of hole should be under the prerequisite that does not influence main ripple the place that subwave is the strongest.In order to determine the position in second group of hole, should at first obtain the wavelength-division Butut on the floor, do not influence under the prerequisite of main ripple the position that subwave is the strongest in searching on the wavelength-division Butut.Being the center with this position then, determining its radius, also is to be prerequisite not influence main ripple certainly.
For second embodiment, as can be seen from Figure 8, the position in second group of hole is the mid point of the projection three sides of a triangle of radiant panel, and its radius is less than first group of hole.If the radius in second group of hole will weaken main ripple greater than first group of hole, make the performance depreciation of antenna.
From Fig. 7 and Fig. 8 as can be seen, distributing point 21 and 22 position among second embodiment.For the single polarization microstrip antenna, distributing point is positioned at the geometric center of radiant panel or near the zone the geometric center, and the effect of its antenna is more or less the same.If but depart from this zone, may make the performance of antenna degenerate significantly.Because the shape of different radiant panels and different antenna sizes, this zone can't define with the numerical value interval, but can think, this zone is a such zone, this zone comprises the geometric center of radiant panel, and the performance of antenna can significantly not degenerate because of the variation of feed position in this zone.For the dual polarization of this second embodiment, distributing point 21 is the distributing points that are positioned at the triangle center zone, and after the position of distributing point 21 was determined, the position of another distributing point 22 will be chosen as follows, and its position is the intersection point that is positioned at two dual-polarized main ripple zero potential lines.
Fig. 9 is the lateral plan of the dual polarization triangle microstrip antenna structure of second embodiment of the invention.Also comprise two coaxial connectors 5 and 6 in the second embodiment of the present invention.Coaxial connector 5 and 6 is connected respectively to two distributing points 21 and 22 that are positioned on the metal patch 2.
With reference to Figure 10, the cutaway view of the dual polarization triangle microstrip antenna structure of second embodiment of the invention (only having expressed a coaxial connector 5 among the figure), the inner core 51 of coaxial connector passes substrate 3 and is connected to metal patch 2, and the outer core 52 of coaxial connector is connected to metal floor 1.
Above-mentioned coaxial connector also can be energized other connector such as probe and replace, and this is a prior art to those skilled in the art.
Be the dual polarization triangle microstrip antenna port A of second embodiment of the invention and the return loss plot figure of port B as shown in figure 11, the electromagnetic wave that its middle port A produces corresponding to distributing point 21, the electromagnetic wave that port B produces corresponding to distributing point 22.Represented three curves among Fig. 5, " antenna A emulation S11 " curve is the antenna return loss curve of emulation when first group of hole and second group of hole are not set on the floor, " antenna B emulation S11 " curve is the antenna return loss curve of the emulation after first group of hole and second group of hole are set on the floor, and " antenna B tests S11 " curve is the antenna return loss curve of the actual measurement after first group of hole and second group of hole are set on the floor.During antenna performance was measured, return loss was-the following scope definition of 10db is the bandwidth of antenna.As can be seen from the figure, in return loss be-10db on, the A/F of " antenna B emulation S11 " curve and " antenna B tests S11 " curve is significantly greater than the width of " antenna A emulation S11 " curve opening, the bandwidth of antenna has obtained significant raising.
Figure 12 is that the dual polarization triangle microstrip antenna port A of second embodiment of the invention and the two-port of port B are isolated curve chart.Equally, " antenna A emulation S12 " curve is the port isolation curve of emulation when first group of hole and second group of hole are not set on the floor, " antenna B emulation S12 " curve is for being provided with the port isolation curve of first group of hole and second group of hole post-simulation on the floor, " antenna B test S12 " curve is the port isolation curve of surveying behind first group of hole and the second group of hole being provided with on the floor.For the port isolation curve, negative multilist more shows that isolation effect is good more.As can be seen from the figure, far well twice Simulation result of the isolation effect of actual measurement, this has improved the performance of antenna greatly, and this result is unpredictable in advance.
Figure 13 and Figure 14 are the H face directional diagram curve chart of dual polarization triangle microstrip antenna port A of second embodiment of the invention and the E face directional diagram curve chart of port B.As can be seen from the figure,, do not have influence on its directional characteristic, so the solution of the present invention is a practicable improvement though, improved the performance of antenna greatly on the floor by two groups of holes are set.
Below be rectangle by a radiant panel the single polarization microstrip antenna further specifies technical scheme of the present invention.
Figure 15 is the front view of the rectangular microstrip antenna structure of second embodiment of the invention.This squaerial comprises 1, one substrate 3 in a floor equally, and it is positioned at the top of metal floor 1, be arranged in parallel with metal floor 1; The metal patch 7 of a rectangle, it is arranged on the upper surface of substrate 3; Distributing point 8 is used for externally being electrically connected, with excitation metal patch 7, radiated electromagnetic wave.
Figure 16 is the rearview of the rectangular microstrip antenna structure of second embodiment of the invention.The position in first group of hole 31 of present embodiment is four summits of rectangle, and its spacing is the half-wavelength of main ripple.The position in second group of hole 32 of present embodiment is the mid point of rectangle four edges.The position of the distributing point 21,22 of present embodiment be rectangle about and off-centered position on the line of symmetry up and down.Other parts of the 3rd embodiment, very approaching with second embodiment, repeat no more here.
Above embodiment is only in order to explanation, and unrestricted technical scheme of the present invention.Although the present invention is had been described in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention; and not breaking away from the spirit and scope of technical solution of the present invention, it all is encompassed among the scope of claim protection of the present invention.
Claims (12)
1, a kind of single polarization microstrip antenna comprises:
A floor;
A radiant panel; Described radiant panel is an isosceles triangle, and has " U " shape groove on this radiant panel, and the opening that is somebody's turn to do " U " shape groove is towards leg-of-mutton base;
A connector, this connector is connected to radiant panel by the distributing point that is arranged on the radiant panel; Under the floor, can be activated to radiant panel, form electromagnetic radiation by this connector;
Wherein: described floor comprises plural breach and is positioned on the floor edge or outside corresponding to the position of radiant panel, and the distance between the described breach be essentially this antenna master wave-wave long 1/2nd.
2, microstrip antenna according to claim 1, wherein: described first group of breach is circular port, its diameter is essentially the multiple of this antenna master ripple half-wavelength.
3, microstrip antenna according to claim 1, wherein: described first group of breach is seam shape opening.
4, according to claim 1,2 or 3 described microstrip antennas, wherein: described distributing point is positioned at the central area of radiant panel.
5, according to claim 1,2 or 3 described microstrip antennas, wherein: described radiant panel comprises:
A substrate;
A microband paste, described microband paste is arranged on the described substrate.
6, according to claim 1,2 or 3 described microstrip antennas, wherein: also comprise a stationary support between described floor and the radiant panel.
7, a kind of method of making microstrip antenna comprises the steps:
A floor is provided;
A radiant panel is provided; Described radiant panel is an isosceles triangle, and has " U " shape groove on this radiant panel, and the opening that is somebody's turn to do " U " shape groove is towards leg-of-mutton base;
At least one connector is provided, and this connector is connected to radiant panel by the distributing point that is arranged on the radiant panel; Under the floor, can be activated to radiant panel, form electromagnetic radiation by this connector;
Wherein: described floor comprises plural breach and is positioned on the floor edge or outside corresponding to the position of radiant panel, and the distance between the described breach be essentially this antenna master wave-wave long 1/2nd.
8, the method for making microstrip antenna according to claim 7, wherein: described first group of breach is circular, and its diameter is essentially the multiple of this antenna master ripple half-wavelength.
9, the method for making microstrip antenna according to claim 7, wherein: described first group of breach is seam shape opening.
10, according to the method for claim 7,8 or 9 described making microstrip antennas, wherein: described distributing point is positioned at the central area of radiant panel.
11, according to the method for claim 7,8 or 9 described making microstrip antennas, wherein: described radiant panel comprises:
A substrate;
A microband paste, described microband paste is arranged on the described substrate.
12, according to the method for claim 7,8 or 9 described making microstrip antennas, wherein: also comprise a stationary support between described floor and the radiant panel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510004983 CN1815810A (en) | 2005-01-31 | 2005-01-31 | Microband antenna and producing method |
| PCT/IB2006/050298 WO2006079996A1 (en) | 2005-01-31 | 2006-01-27 | Microstrip antenna and fabricatoin method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510004983 CN1815810A (en) | 2005-01-31 | 2005-01-31 | Microband antenna and producing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1815810A true CN1815810A (en) | 2006-08-09 |
Family
ID=36368469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510004983 Pending CN1815810A (en) | 2005-01-31 | 2005-01-31 | Microband antenna and producing method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1815810A (en) |
| WO (1) | WO2006079996A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114824778A (en) * | 2022-05-25 | 2022-07-29 | 陕西北斗科技开发应用有限公司 | Multi-frequency plane microstrip antenna applied to 5G communication and Beidou positioning |
-
2005
- 2005-01-31 CN CN 200510004983 patent/CN1815810A/en active Pending
-
2006
- 2006-01-27 WO PCT/IB2006/050298 patent/WO2006079996A1/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114824778A (en) * | 2022-05-25 | 2022-07-29 | 陕西北斗科技开发应用有限公司 | Multi-frequency plane microstrip antenna applied to 5G communication and Beidou positioning |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006079996A1 (en) | 2006-08-03 |
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Open date: 20060809 |