CN102201616A - Time reversal sub-wavelength array antenna for wireless mobile terminal - Google Patents
Time reversal sub-wavelength array antenna for wireless mobile terminal Download PDFInfo
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- CN102201616A CN102201616A CN2010105979087A CN201010597908A CN102201616A CN 102201616 A CN102201616 A CN 102201616A CN 2010105979087 A CN2010105979087 A CN 2010105979087A CN 201010597908 A CN201010597908 A CN 201010597908A CN 102201616 A CN102201616 A CN 102201616A
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Abstract
The invention discloses a time reversal sub-wavelength array antenna for a wireless mobile terminal and belongs to the electronic technical field. The time reversal sub-wavelength array antenna consists of a plurality of same antenna units which are stacked with one another; a radiating unit of each of the antenna units is an isosceles triangular ring; crossed slots are etched on the isosceles triangular rings uniformly; the peaks of the isosceles triangular rings are connected with a 50-ohm micro-strip feed line through an impedance transformation micro-strip; a metal base plate is positioned at a position, corresponding to the impedance transformation micro-strip and the 50-ohm micro-strip feed line, on the back of a rectangular medium substrate; crossed slots are uniformly etched on the rectangular metal base plate; and a distance between the radiating units of two adjacent antenna units is ranged from 1/40 to 1/2 wavelength. When applied in a mobile terminal of a time domain communication system, time reversal sub-wavelength array antenna ensures that the channels in a multi-antenna system are relatively independent by using a time reversal technology and the cross coupling and interference between the adjacent channels are low, supports higher data transmission rate and higher frequency spectrum utilization rate, and greatly improves the communication capacity and the communication rate of the mobile terminal.
Description
Technical field
The invention belongs to electronic technology field, it relates to a kind of high density aerial array of structuring the formation, and its antenna surface less than operation wavelength, is specifically related to a kind of time reversal sub-wavelength aerial array that is used for mobile radio terminal to the distance between the face.
Background technology
Improving the message capacity and the traffic rate of mobile communication system, is the target that mobile communication is pursued all the time.Along with the continuous growth of individual business demand, portable terminal is faced with message capacity and traffic rate great demand in urgent need to be improved.The a plurality of antenna elements of design increase independently wireless channel quantity on portable terminal, to improve communications of Mobile Terminals capacity and traffic rate, are one of main means of future mobile communications raising communication of mobile terminal performance.
Because the size of mobile-terminal platform is limited, although people have carried out many research to the antenna element miniaturization, a plurality of antennas that are used for different channels is integrated in portable terminal, the shared space of a plurality of antennas is still bigger.This is because according to traditional theory, for making good space diversity gain of multiaerial system acquisition and spatial reuse gain, require the antenna element spacing to be not less than operation wavelength half, thereby cause a plurality of antenna occupation space bigger.If in the confined space, make the antenna element spacing much smaller than half operation wavelength, to cause the coupling between the unit to increase, the correlation of the wireless channel of each antenna correspondence improves greatly, cause the message capacity and the traffic rate of mobile terminal system greatly to reduce, grievous injury communication quality, thereby lost the meaning of introducing multiaerial system.
Therefore, on the limited platform of portable terminal size, how to make up the separate high density multiaerial system of numerous channels, thereby greatly improve message capacity and traffic rate, can adopt methods such as polarization diversity, but these methods are merely able to use two antennas that polarised direction is different, if number of antennas further increases, then are difficult to be suitable for.
Increasingly mature along with the time reversal technology utilizes the adaptive space of time reversal electromagnetic wave, time synchronized focus characteristics, can solve the insurmountable difficult problem of many conventional methods.Time reversal (Time Reversal, i.e. TR) need be covered with signal receiver on the occluding surface in the source of encirclement, this receiving system is called TR Cavities, i.e. TRC.TRC receives the laggard line time inverting of signal of source emission, emission again again, and the signal of re-emissioning just can near implementation space and time focusing source point.The TRC of sealing is desirable receiving system, is difficult in the application and realizes.The array (TRMirror, i.e. TRM) that people such as Fink form limited reception antenna is placed in the environment with rich multipath and experimentizes, and equally also can observe the focusing phenomenon.1991, D.R.Jackson and D.R.Dowling deliver be entitled as " Phase conjugation in underwater acoustics; " (J.Acoust.Soc.Amer., vol.89, pp.171-181), given theoretical proof to the focus characteristics that time reversal is had in the literary composition under " scalar wave " transmission situation.2004, people such as G.lerosey deliver and are entitled as " Time Reversal ofelectromagnetic waves " (Phys.Rev.Lett., vol.92, pp.1939041), in the literary composition experimental verification first " time reversal electromagnetic wave " same tool focus characteristics at one's leisure.2007, people such as R.Carminati deliver and are entitled as " Theory of the timereversal cavity for electromagnetic fields " (Optics Lett., vol.32, Nov.2007), use dyadic Green's function that the focusing of time reversal " vector electromagnetic wave " is proved in the literary composition.Same in that delivering at " Science " of people such as G.Lerosey in 2007 is entitled as " Focusing beyong the diffraction limit with far-field time reversal; " (Science, vol.315, pp.1119-1122, Feb.2007.), provided a kind of sub-wavelength aerial array in the literary composition, it constitutes around being enclosed in coaxial probe by the wire of random distribution.This aerial array binding time inverting electromagnetic wave is operated in 2.45GHz in the wire chamber of sealing, can show the super-resolution focus characteristics of 1/30 wavelength.These achievements also only limit to the experimental stage at present, and the bandwidth of this aerial array also has much room for improvement, but it has tentatively showed the realizability of sub-wavelength super-resolution aerial array.
The present invention is intended to based on the electromagnetic far field super-resolution rate of time reversal focus characteristics, separate, the spacing of research channel is much smaller than the sub-wavelength micro-structural aerial array of wavelength, for the sub-wavelength micro-structural antenna array design that is used for the high-performance portable terminal provides best array structure, the method for designing of high-efficiency high-accuracy.
Summary of the invention
In order effectively to reduce the spacing between the array antenna, reduce array antenna occupation space volume, the invention provides a kind of time reversal sub-wavelength array antenna that is used for mobile radio terminal, each unit input port voltage standing wave ratio is less than 2.1 in this array antenna working band, and the aspectant spacing in unit and unit is less than 1/2 operation wavelength (wavelength calculates with centre frequency) in the array.Make the traditional antenna array to be broken by the bottleneck of effective integration in the mobile radio terminal system of finite volume.It is little that this aerial array has a volume, and a large amount of production costs are low, and performance is good, is easy to integrated advantage.
Technical solution of the present invention is:
A kind of time reversal sub-wavelength array antenna that is used for mobile radio terminal as shown in Figure 1, is laminated by a plurality of identical antenna elements.Each antenna element as shown in Figure 2, be positioned at rectangle dielectric substrate front radiating element 4 be shaped as the isoceles triangle ring, the angle between two waists is between 30～50 degree, the base is parallel to the narrow limit of rectangle dielectric substrate; On the isoceles triangle ring evenly etching the isometric cross recesses of some two arms, cross recessed two arm lengths between 1/40～1/20 wavelength, width is between 1/400～1/200 wavelength.The vertex position of isoceles triangle ring links to each other with the 3rd section microstrip line 1 with second section microstrip line 2 by first section microstrip line 3 successively, wherein first section microstrip line 3 and second section microstrip line 2 constitute 1/4 wavelength impedance conversion microstrip line, and the 3rd section microstrip line 1 is that characteristic impedance is 50 ohm a microstrip feed line.The rectangular metal base plate is positioned at the corresponding position of the rectangle dielectric substrate back side and three sections microstrip lines 1,2 and 3, and its width equates that with the width of rectangle dielectric substrate it highly is slightly less than three sections microstrip lines 1,2 and 3 length sums; On the rectangular metal base plate with the corresponding even etching in both sides of three sections microstrip lines 1,2 and 3 cross recess of the identical size of cross recess of etching on some and the radiating element 4.Distance between the radiating element of adjacent two each and every one antenna elements is between 1/40～1/2 wavelength.
The present invention according to the time reversal electromagnetic wave in coupling between the high density antenna array unit and near the resonance characteristic the unit, realization has the integrated sub-wavelength array antenna of high density of high spatial resolution, a kind of effective solution of realizing high density multiaerial system integration problem on the limited portable terminal in space has been proposed, explore the method for designing of many antenna integrated systems of the spatial super-resolution characteristic in the high-performance mobile radio communication of new generation, with performances such as the spatial reuse gain that improves multiaerial system and space diversity gains.Compare with existing mobile terminal antenna system, this sub-wavelength array antenna can be supported higher data transmission rate, the higher availability of frequency spectrum, higher Information Security and greater flexibility, has improved communications of Mobile Terminals capacity and traffic rate to a great extent.
Although the spacing in the sub-wavelength aerial array between the unit less than in addition much smaller than half wavelength, binding time inverting electromagnetic wave has the spatial super-resolution characteristic, can greatly suppress the mutual coupling between the point blank antenna.In the limited space of multi-antenna wireless mobile terminal communication system platform, the number of unit in the array antenna is compared the traditional antenna number of unit and is expanded rapidly, and then makes traffic rate, message capacity improve rapidly.When the present invention is applied in practical communication, not needing signal is carried out complicated processing, only is simple inversion procedure, promptly can show the super-resolution characteristic, and it is convenient that whole process implements, and is easy to Project Realization.
It may be noted that especially since the time reversal electromagnetic wave with its adaptive space, time focus characteristics, abundant at multipath, under the complicated situation, focusing effect is good more for environment.The sub-wavelength multi-antenna array that the present invention is designed, have very strong flexibly, can in various complex environments, (comprise mountain area, river, forest, city and suburb), more can make full use of the multipath of signal in the complex environment, utilize coupling and particular resonance characteristic between the antenna element, be more conducive in complex environment, carry out the communication of two-forty, big capacity, high reliability and high security.
In sum, when the present invention is applied in the domain communication system portable terminal, utilize the time reversal technology, directly time-domain signal is carried out inversion procedure, make that each channel keeps relatively independent in the multiaerial system, mutual coupling is very little, monkey chatter is extremely low, can support higher data transmission rate, the higher availability of frequency spectrum, higher Information Security and greater flexibility, improve communications of Mobile Terminals capacity and traffic rate to a great extent, and then guaranteed the communication quality in many antennas, the high capacity communication process.
Description of drawings
Fig. 1 is an array antenna structure schematic diagram provided by the invention.
Fig. 2 is the antenna unit structure schematic diagram of array antenna provided by the invention.Wherein (a) is the substrate Facad structure, (b) is the substrate back structure.
Fig. 3 is the antenna element size marking schematic diagram of the array antenna that provides of the specific embodiment of the invention.Wherein (a) is substrate Facad structure size marking, (b) is substrate back physical dimension mark.
Fig. 4 is the test result of array antenna input port voltage standing wave ratio provided by the invention.
Fig. 5 is the far-field radiation Direction Pattern Simulation result of antenna element under the 2.5GHz frequency of the present invention's array antenna provided by the invention.
Fig. 6 is the far-field radiation Direction Pattern Simulation result of antenna element under the 3.5GHz frequency of array antenna provided by the invention.
Fig. 7 is the far-field radiation Direction Pattern Simulation result of antenna element under the 5.5GHz frequency of array antenna provided by the invention.
Fig. 8 is an array antenna array super-resolution test result provided by the invention.
Embodiment
A kind of time reversal sub-wavelength array antenna that is used for mobile radio terminal as shown in Figure 1, is laminated by a plurality of identical antenna elements.Each antenna element as shown in Figure 2, be positioned at rectangle dielectric substrate front radiating element 4 be shaped as the isoceles triangle ring, the angle between two waists is between 30～50 degree, the base is parallel to the narrow limit of rectangle dielectric substrate; On the isoceles triangle ring evenly etching the isometric cross recesses of some two arms, cross recessed two arm lengths between 1/40～1/20 wavelength, width is between 1/400～1/200 wavelength.The vertex position of isoceles triangle ring links to each other with the 3rd section microstrip line 1 with second section microstrip line 2 by first section microstrip line 3 successively, wherein first section microstrip line 3 and second section microstrip line 2 constitute 1/4 wavelength impedance conversion microstrip line, and the 3rd section microstrip line 1 is that characteristic impedance is 50 ohm a microstrip feed line.The rectangular metal base plate is positioned at the corresponding position of the rectangle dielectric substrate back side and three sections microstrip lines 1,2 and 3, and its width equates that with the width of rectangle dielectric substrate it highly is slightly less than three sections microstrip lines 1,2 and 3 length sums; On the rectangular metal base plate with the corresponding even etching in both sides of three sections microstrip lines 1,2 and 3 cross recess of the identical size of cross recess of etching on some and the radiating element 4.Distance between the radiating element of adjacent two each and every one antenna elements is between 1/40～1/2 wavelength.
Fig. 3 is the antenna element size marking schematic diagram of the array antenna that provides of the specific embodiment of the invention.Wherein (a) is substrate Facad structure size marking, (b) is substrate back physical dimension mark.Need to prove, Fig. 3 has just provided a kind of embodiment, is the proof to the technology of the present invention effect, and is not to be limitation of the invention further, those skilled in the art are according to the description of technical solution of the present invention, should determine that the present invention has more multiclass like implementation.
As shown in Figure 3: the long 90mm of rectangle dielectric substrate, wide 36mm, the wide 36mm of metal backing, high 44mm, first section microstrip line 3 long 15.5mm, wide 0.4mm, second section microstrip line 2 long 16mm, wide 1.5mm, the 3rd section microstrip line 1 long 14mm, wide 2.5mm; The cross recess number is 20 on the isoceles triangle ring, and the cross recess number is 13 on the metal floor; The relative dielectric constant of dielectric substrate is 2.2, and loss angle tangent is 0.001.
Through Computer Simulation, voltage standing wave ratio and the far-field radiation directional characteristic of above-mentioned aerial array in the 2.5GHz-5.5GHz frequency range seen Fig. 4, Fig. 5 and shown in Figure 6.
Fig. 3 has provided the feed port voltage standing wave ratio, and under the 4.6GHz frequency, the maximum of voltage standing wave ratio is 2.1.
Fig. 4 has provided antenna element under the 2.5GHz frequency, coplane radiation characteristic and cross polarization characteristics all in the far-field radiation directional diagram, its maximum 3dB that gains.
Fig. 5 has provided antenna element under the 3.5GHz frequency, coplane radiation characteristic and cross polarization characteristics all in the far-field radiation directional diagram, its maximum 3dB that gains.
Fig. 6 has provided antenna element under the 5.5GHz frequency, coplane radiation characteristic and cross polarization characteristics all in the far-field radiation directional diagram, its maximum 3dB that gains.
4 antenna elements shown in Figure 3 are formed array, and put on the antenna surface opposite, and spacing all can show the focus characteristics of super-resolution less than half wavelength up to 1/40 wavelength.Fig. 7 has provided aerial array, the super-resolution characteristic that the binding time inversion technique shows.The definition antenna element is followed successively by antenna element from top to bottom 1,2,3, No. 4, with No. 2 antennas is example, when No. 2 antenna transmission signals, after TRM extracts its channel characteristics, send once more, the signal amplitude maximum of having only No. 2 antenna elements to receive, the signal amplitude that other antenna receives all less than No. 2 antennas half, this means, during communication, No. 2 antennas are independently channels, and No. 2 antenna is very little to the interference of other antenna.And other antenna is when communication, also be to have the status that is equal to No. 2 antennas, each antenna is represented a separate channel, and other antenna is all had very little interference, can utilize the time reversal technology to carry out two-forty, high-quality multi-antenna communication very easily.
Claims (1)
1. a time reversal sub-wavelength array antenna that is used for mobile radio terminal is laminated by a plurality of identical antenna elements; In each antenna element, be positioned at rectangle dielectric substrate front radiating element (4) be shaped as the isoceles triangle ring, the angle between two waists is between 30～50 degree, the base is parallel to the narrow limit of rectangle dielectric substrate; On the isoceles triangle ring evenly etching the isometric cross recesses of some two arms, cross recessed two arm lengths between 1/40～1/20 wavelength, width is between 1/400～1/200 wavelength; The vertex position of isoceles triangle ring links to each other with the 3rd section microstrip line (1) with second section microstrip line (2) by first section microstrip line (3) successively, wherein first section microstrip line (3) and second section microstrip line (2) constitute 1/4 wavelength impedance conversion microstrip line, and the 3rd section microstrip line (1) is that characteristic impedance is 50 ohm a microstrip feed line; The rectangular metal base plate is positioned at the rectangle dielectric substrate back side and the corresponding position of three sections microstrip lines (1,2 and 3), and its width equates that with the width of rectangle dielectric substrate it highly is slightly less than three sections microstrip lines (1,2 and 3) length sum; On the rectangular metal base plate with the corresponding even etching in both sides of three sections microstrip lines (1,2 and 3) some and radiating element (4) go up the cross recess of the identical size of cross recess of etching; Distance between the radiating element of adjacent two antenna elements is between 1/40～1/2 wavelength.
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| CN 201010597908 CN102201616B (en) | 2010-12-21 | 2010-12-21 | Time reversal sub-wavelength array antenna for wireless mobile terminal |
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| CN 201010597908 CN102201616B (en) | 2010-12-21 | 2010-12-21 | Time reversal sub-wavelength array antenna for wireless mobile terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113328248A (en) * | 2021-08-02 | 2021-08-31 | 浙江高速信息工程技术有限公司 | Millimeter wave radar oblique polarization radiation MIMO antenna unit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617388A (en) * | 2003-11-11 | 2005-05-18 | 三美电机株式会社 | Antenna unit |
| US7342549B2 (en) * | 2003-08-27 | 2008-03-11 | Anderson Theodore R | Configurable arrays for steerable antennas and wireless network incorporating the steerable antennas |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7342549B2 (en) * | 2003-08-27 | 2008-03-11 | Anderson Theodore R | Configurable arrays for steerable antennas and wireless network incorporating the steerable antennas |
| CN1617388A (en) * | 2003-11-11 | 2005-05-18 | 三美电机株式会社 | Antenna unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113328248A (en) * | 2021-08-02 | 2021-08-31 | 浙江高速信息工程技术有限公司 | Millimeter wave radar oblique polarization radiation MIMO antenna unit |
| CN113328248B (en) * | 2021-08-02 | 2021-12-24 | 浙江高速信息工程技术有限公司 | Millimeter wave radar oblique polarization radiation MIMO antenna unit |
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| CN102201616B (en) | 2013-06-12 |
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