CN102110901B - Time reversal subwavelength array antenna used for wireless mobile terminal - Google Patents
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Abstract
The invention relates to a time reversal subwavelength array antenna used for a wireless mobile terminal, belonging to the technical field of electronics. The antenna is formed by laminating multiple antenna units which are arranged at the intervals of 2.5-50% of the wavelength. Each antenna unit is composed of metal patches which are respectively arranged on the front and the back of a rectangular medium substrate; the metal patch on the front of the rectangular medium substrate comprises an elliptic radiating unit at the center as well as a first rectangular metal patch and a first right-angle trapezoid metal patch which are mutually connected; the metal patch on the back of the rectangular medium substrate comprises a second rectangular metal patch and a second right-angle trapezoid metal patch which are mutually connected; the two right-angle trapezoid metal patches are the same in size and are opposite in position, and an arc-shaped protuberance is arranged on the second rectangular metal patch close to the elliptic radiating unit; and etching grooves are uniformly distributed on each metal patch. The antenna provided by the invention is applied to a time reversal time domain communication mobile terminal, each antenna unit channel is relatively independent, cross coupling is less, interference from an adjacent channel is less, and higher data transmission rate and higher frequency spectrum utilization factor can be supported.
Description
Technical field
The invention belongs to electronic technology field, relate to a kind of high density aerial array of structuring the formation, its antenna element face less than operation wavelength, is specifically related to a kind of time reversal sub-wavelength aerial array for mobile radio terminal to the distance between face.
Background technology
Improving 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, mobile terminal is faced with message capacity and traffic rate great demand in urgent need to be improved.A plurality of antenna elements of design, increase independently wireless channel quantity on mobile terminal, to improve message capacity and the traffic rate of mobile terminal, is 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 for different channels are integrated in mobile terminal, the shared space of a plurality of antennas is still larger.This be because, according to traditional theory, obtain good space diversity gain and spatial reuse gain for making multiaerial system, require the antenna element spacing can not be less than half operation wavelength, thereby the space that causes a plurality of antennas to take be larger.If make the antenna element spacing much smaller than half operation wavelength in the confined space, to cause the coupling between the unit to increase, the correlation of the wireless channel that each antenna is corresponding improves greatly, cause 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 mobile terminal size, how to build the separate high density multiaerial system of numerous channels, thereby greatly improve message capacity and traffic rate, can adopt the 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, are difficult to be suitable for.
Increasingly mature along with the time reversal technology utilizes time reversal electromagnetic wave adaptive space, time synchronized focus characteristics, can solve the insurmountable difficult problem of many conventional methods.Time reversal (Time Reversal, i.e. TR) need to 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, then emission 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 to realize in application.The array (TRMirror, i.e. TRM) that the people such as Fink form limited reception antenna is placed in the environment with rich multipath tests, and equally also can observe the focusing phenomenon.1991, D.R.Jackson and D.R.Dowling deliver and are 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 literary composition in " scalar wave " transmission situation.2004, the human hair table titles such as G.lerosey are " Time Reversal ofelectromagnetic waves " (Phys.Rev.Lett., vol.92, pp.1939041), in literary composition experimental verification first " time reversal electromagnetic wave " same tool focus characteristics at one's leisure.2007, the human hair table titles such as R.Carminati are " 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 literary composition.Be entitled as " Focusing beyong the diffraction limit with far-field time reversal " (Science the delivering at " Science " of people such as G.Lerosey in 2007 equally, vol.315, pp.1119-1122, Feb.2007.), provided a kind of sub-wavelength aerial array in literary composition, it consists of 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 the electromagnetic far field super-resolution rate of time-based inverting 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 mobile 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 each antenna element of array antenna, reduce the spatial volume that array antenna takies, the invention provides a kind of time reversal sub-wavelength array antenna for wireless mobile terminal.In this array antenna working band, each unit input port voltage standing wave ratio is less than 2.1, and in array, the aspectant spacing in unit and unit is less than 1/2 operation wavelength (wavelength calculates with centre frequency).Make the traditional antenna array can't effective integration bottleneck in the mobile radio terminal system of finite volume broken.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 for wireless mobile terminal as shown in Figure 1, is laminated by a plurality of identical antenna elements; Distance between adjacent two antenna elements is between 1/40～1/2 wavelength.
Each antenna element is made of Rectangular Enclosure with Participating Media substrate, the metal patch that is positioned at the metal patch in Rectangular Enclosure with Participating Media substrate front and is positioned at the Rectangular Enclosure with Participating Media substrate back as shown in Figure 2.
Be positioned at the metal patch in Rectangular Enclosure with Participating Media substrate front as shown in Fig. 2 (a), consisted of by the two parts that separate:
First's metal patch 1 is oval radiating element, and the geometric center of oval radiating element is positioned on the center line of dielectric substrate narrow limit, and oval major axis is parallel to the narrow limit of Rectangular Enclosure with Participating Media substrate; Oval radiating element is that the microstrip feed line 3 of 50 ohm is connected by being positioned at 1/4 wavelength impedance transformation microstrip line 2 and characteristic impedance on being positioned at equally dielectric substrate narrow limit center line on the center line of dielectric substrate narrow limit, and characteristic impedance is that the end of the microstrip feed line 3 of 50 ohm is positioned at centre position, the narrow limit of dielectric substrate.
The second portion metal patch is made of the first rectangular metal paster 5 that is connected with each other and the first right-angled trapezium metal patch 4; Wherein two of the first right-angled trapezium metal patch 4 long right-angle sides are in respectively broadside and the position, narrow limit of dielectric substrate; In the first rectangular metal paster 5, a long limit is positioned at the broadside of dielectric substrate, and the short right-angle side of minor face and right-angled trapezium metal patch 4 coincides, and another minor face is positioned at the narrow limit of dielectric substrate, end place that characteristic impedance is the microstrip feed line 3 of 50 ohm.
Be positioned at the metal patch of Rectangular Enclosure with Participating Media substrate back as shown in Fig. 2 (b), consisted of by the second rectangular metal paster 7 that is connected with each other and the second right-angled trapezium metal patch 6; Wherein the second right-angled trapezium metal patch 6 is just in time relative in the position in Rectangular Enclosure with Participating Media substrate front at the position of Rectangular Enclosure with Participating Media substrate back and the first right-angled trapezium metal patch 4; The width dimensions of the second rectangular metal paster 7 equates with the length dimension of the first rectangular metal paster, the length dimension of the second rectangular metal paster 7 is slightly less than the broadside size of Rectangular Enclosure with Participating Media substrate, the second rectangular metal paster 7 has an arc-shaped protrusions 8 near the place at Rectangular Enclosure with Participating Media substrate middle part, and arc-shaped protrusions 8 peaks are slightly less than the length sum of the microstrip feed line 3 of 1/4 wavelength impedance transformation microstrip line 2 and 50 ohm from the distance of the second rectangular metal paster 7 opposite side.
All evenly distribute to such an extent that ellipse or circular etched recesses are arranged on all metal patches, all etched recesses live widths are consistent, and groove is interior without metal material.
The present invention according to the time reversal electromagnetic wave in the coupling between the high density antenna array unit and near the resonance characteristic the unit, realization has the High Density Integration sub-wavelength array antenna of high spatial resolution, a kind of effective solution of realizing high density multiaerial system integration problem on the mobile terminal of limited space has been proposed, explore the method for designing of many antenna integrated systems of the spatial super-resolution characteristic in high-performance mobile communication network of new generation, with performances such as the spatial reuse gain that improves multiaerial system and space diversity gains.System compares with existing mobile terminal antenna, 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 to a great extent message capacity and the traffic rate of mobile terminal.
Although the spacing in the sub-wavelength aerial array between the unit less than, even 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 multi-antenna wireless mobile terminal communication system platform limited space, the number of unit in 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, is only simple inversion procedure, namely can show the super-resolution characteristic, and it is convenient that whole process implementation gets up, and is easy to Project Realization.
It may be noted that especially due to the time reversal electromagnetic wave with its adaptive space, time focus characteristics, abundant at multipath, under complicated situation, focusing effect is better for environment.The sub-wavelength multi-antenna array that the present invention is designed, have very strong flexibly, can (comprise mountain area, river, forest, city and suburb) in various complex environments, more can take full advantage of the multipath of signal in complex environment, utilize coupling and particular resonance characteristic between antenna element, be more conducive to carry out the communication of two-forty, large capacity, high reliability and high security in complex environment.
In sum, when the present invention is applied in the domain communication system mobile terminal, utilize the time reversal technology, directly time-domain signal is carried out inversion procedure, make in multiaerial system each channel keep relatively independent, 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 to a great extent message capacity and the traffic rate of mobile terminal, and then guaranteed the communication quality in many antennas, high capacity communication process.
Description of drawings
Fig. 1 is 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, is (b) 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 3GHz frequency of array antenna provided by the invention.
Fig. 6 is the far-field radiation Direction Pattern Simulation result of antenna element under the 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 6GHz frequency of array antenna provided by the invention.
Fig. 8 is array antenna array super-resolution test result provided by the invention.
Embodiment
A kind of time reversal sub-wavelength array antenna for wireless mobile terminal as shown in Figure 1, is laminated by a plurality of identical antenna elements, and the distance between adjacent two antenna elements is between 1/40～1/2 wavelength.
Each antenna element is made of Rectangular Enclosure with Participating Media substrate, the metal patch that is positioned at the metal patch in Rectangular Enclosure with Participating Media substrate front and is positioned at the Rectangular Enclosure with Participating Media substrate back as shown in Figure 2.
Be positioned at the metal patch in Rectangular Enclosure with Participating Media substrate front as shown in Fig. 2 (a), consisted of by the two parts that separate:
First's metal patch 1 is oval radiating element, and the geometric center of oval radiating element is positioned on the center line of dielectric substrate narrow limit, and oval major axis is parallel to the narrow limit of Rectangular Enclosure with Participating Media substrate; Oval radiating element is that the microstrip feed line 3 of 50 ohm is connected by being positioned at 1/4 wavelength impedance transformation microstrip line 2 and characteristic impedance on being positioned at equally dielectric substrate narrow limit center line on the center line of dielectric substrate narrow limit, and characteristic impedance is that the end of the microstrip feed line 3 of 50 ohm is positioned at centre position, the narrow limit of dielectric substrate.
The second portion metal patch is made of the first rectangular metal paster 5 that is connected with each other and the first right-angled trapezium metal patch 4; Wherein two of the first right-angled trapezium metal patch 4 long right-angle sides are in respectively broadside and the position, narrow limit of dielectric substrate; In the first rectangular metal paster 5, a long limit is positioned at the broadside of dielectric substrate, and the short right-angle side of minor face and right-angled trapezium metal patch 4 coincides, and another minor face is positioned at the narrow limit of dielectric substrate, end place that characteristic impedance is the microstrip feed line 3 of 50 ohm.
Be positioned at the metal patch of Rectangular Enclosure with Participating Media substrate back as shown in Fig. 2 (b), consisted of by the second rectangular metal paster 7 that is connected with each other and the second right-angled trapezium metal patch 6; Wherein the second right-angled trapezium metal patch 6 is just in time relative in the position in Rectangular Enclosure with Participating Media substrate front at the position of Rectangular Enclosure with Participating Media substrate back and the first right-angled trapezium metal patch 4; The width dimensions of the second rectangular metal paster 7 equates with the length dimension of the first rectangular metal paster, the length dimension of the second rectangular metal paster 7 is slightly less than the broadside size of Rectangular Enclosure with Participating Media substrate, the second rectangular metal paster 7 has an arc-shaped protrusions 8 near the place at Rectangular Enclosure with Participating Media substrate middle part, and arc-shaped protrusions 8 peaks are slightly less than the length sum of the microstrip feed line 3 of 1/4 wavelength impedance transformation microstrip line 2 and 50 ohm from the distance of the second rectangular metal paster 7 opposite side.
All evenly distribute to such an extent that ellipse or circular etched recesses are arranged on all metal patches, all etched recesses live widths are consistent, and groove is interior without metal material.
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 55mm of Rectangular Enclosure with Participating Media substrate, wide 50mm, the relative dielectric constant of dielectric substrate are 2.2, and loss angle tangent is 0.001; Positive oval metal patch 1 major axis and minor axis radius are respectively 14mm, 5mm, 1/4 wavelength impedance transformation microstrip line 2 long 18mm, wide 1.4mm, and characteristic impedance is the long 8mm of microstrip feed line 3 of 50 ohm, wide 2.4mm; Dielectric substrate positive the first long 24mm of rectangular metal paster 5, wide 4mm, the first long right-angle side of right-angled trapezium paster 4 are that 27mm, short right-angle side are 2mm, the high 31mm of being; The dielectric substrate back side the second right-angled trapezium metal patch 6 is measure-alike with positive the first right-angled trapezium paster 4, the second long 48mm of rectangular patch 7, wide 24mm, arc-shaped protrusions is the top camber line of positive oval paster, and the top of projection exceeds rectangular patch top edge 1mm.
Etched oval recess on paster, its outer ellipse long and short shaft radius is respectively 1.3, mm, 0.8mm, and interior ellipse long and short shaft radius is respectively 1mm, 0.5mm; The oval recess number is 19 on the oval metal patch in front, and on the first right-angled trapezium paster, the oval recess number is 32, and on the first rectangular patch, the oval recess number is 7; On the second right-angled trapezium paster, the oval recess number is 32 overleaf, and on the second rectangular patch, the oval recess number is totally 91 of 7*13.
Through Computer Simulation, voltage standing wave ratio and the far-field radiation directional characteristic of above-mentioned aerial array in the 2GHz-7GHz frequency range seen Fig. 3, Fig. 4, Fig. 5 and shown in Figure 6.
Fig. 3 has provided the feed port voltage standing wave ratio, and this unit in the frequency range of 6.7GHz, has comparatively desirable standing-wave ratio at 2.7GHz, and under the 4.7GHz frequency, it is 2.2 that voltage standing wave ratio has higher value.
Fig. 4 has provided the far-field radiation directional diagram of antenna element under the 3GHz frequency.
Fig. 5 has provided the far-field radiation directional diagram of antenna element under the 5GHz frequency.
Fig. 6 has provided the far-field radiation directional diagram of antenna element under the 6GHz frequency.
4 antenna elements shown in Figure 3 are formed arrays, and put on the antenna surface opposite, and spacing is less than half wavelength, until 1/40 wavelength all can show the focus characteristics of super-resolution.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, take No. 2 antennas as example, when No. 2 antenna transmitted signals, after TRM extracts its channel characteristics, again send, the signal amplitude of only having No. 2 antenna elements to receive is maximum, the signal amplitude that other antenna reception arrives 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 to have with No. 2 antennas the status that is equal to, each antenna represents a separate channel, and other antenna is all had very little interference, can utilize very easily the time reversal technology to carry out two-forty, high-quality multi-antenna communication.
Claims (1)
1. a time reversal sub-wavelength array antenna for wireless mobile terminal, be laminated by a plurality of identical antenna elements; Distance between adjacent two radiating elements is between 1/40～1/2 wavelength;
Each antenna element is made of Rectangular Enclosure with Participating Media substrate, the metal patch that is positioned at the metal patch in Rectangular Enclosure with Participating Media substrate front and is positioned at the Rectangular Enclosure with Participating Media substrate back;
The metal patch that is positioned at Rectangular Enclosure with Participating Media substrate front is made of the two parts that separate:
First's metal patch (1) is oval radiating element, and the geometric center of oval radiating element is positioned on the center line of dielectric substrate narrow limit, and oval major axis is parallel to the narrow limit of Rectangular Enclosure with Participating Media substrate; Oval radiating element is that the microstrip feed line (3) of 50 ohm is connected by being positioned at 1/4 wavelength impedance transformation microstrip line (2) and characteristic impedance on being positioned at equally dielectric substrate narrow limit center line on the center line of dielectric substrate narrow limit, and characteristic impedance is that the end of the microstrip feed line (3) of 50 ohm is positioned at centre position, the narrow limit of dielectric substrate;
The second portion metal patch is made of the first rectangular metal paster (5) that is connected with each other and the first right-angled trapezium metal patch (4); Wherein two long right-angle sides of the first right-angled trapezium metal patch (4) are in respectively broadside and the position, narrow limit of dielectric substrate; In the first rectangular metal paster (5), article one, long limit is positioned at the broadside of dielectric substrate, article one, the short right-angle side of minor face and right-angled trapezium metal patch (4) coincides, and another minor face is positioned at the narrow limit of dielectric substrate, end place that characteristic impedance is the microstrip feed line (3) of 50 ohm;
The metal patch that is positioned at the Rectangular Enclosure with Participating Media substrate back is made of the second rectangular metal paster (7) that is connected with each other and the second right-angled trapezium metal patch (6); Wherein the second right-angled trapezium metal patch (6) is just in time relative in the position in Rectangular Enclosure with Participating Media substrate front at the position of Rectangular Enclosure with Participating Media substrate back and the first right-angled trapezium metal patch (4); The width dimensions of the second rectangular metal paster (7) equates with the length dimension of the first rectangular metal paster, the length dimension of the second rectangular metal paster (7) is slightly less than the broadside size of Rectangular Enclosure with Participating Media substrate, the second rectangular metal paster (7) has an arc-shaped protrusions (8) near the place at Rectangular Enclosure with Participating Media substrate middle part, and arc-shaped protrusions (8) peak is slightly less than the length sum of 1/4 wavelength impedance transformation microstrip line (2) and the microstrip feed line (3) of 50 ohm from the distance of the second rectangular metal paster (7) opposite side;
All evenly distribute to such an extent that ellipse or circular etched recesses are arranged on all metal patches, all etched recesses live widths are consistent, and groove is interior without metal material.
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| CN 201110066620 CN102110901B (en) | 2011-03-18 | 2011-03-18 | Time reversal subwavelength array antenna used for wireless mobile terminal |
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| CN102800955B (en) * | 2012-08-16 | 2015-07-29 | 电子科技大学 | A kind of radio communication time reversal sub-wavelength array antenna |
| CN103151617B (en) * | 2013-04-09 | 2015-05-13 | 电子科技大学 | High-gain low-sidelobe narrow-beam heart-shaped array antenna |
| CN104331317B (en) * | 2014-08-29 | 2017-08-11 | 电子科技大学 | External electromagnetic field figuration production method based on time reversal electromagnetic transmission |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640315A (en) * | 2009-09-09 | 2010-02-03 | 东南大学 | Dual stop band ultra wide band antenna based on dual U-shaped defected ground structure |
| CN202004158U (en) * | 2011-03-18 | 2011-10-05 | 电子科技大学 | Time reversal sub-wavelength array antenna for wireless mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640315A (en) * | 2009-09-09 | 2010-02-03 | 东南大学 | Dual stop band ultra wide band antenna based on dual U-shaped defected ground structure |
| CN202004158U (en) * | 2011-03-18 | 2011-10-05 | 电子科技大学 | Time reversal sub-wavelength array antenna for wireless mobile terminal |
Non-Patent Citations (2)
| Title |
|---|
| 时间反演电磁波超分辨率特性;葛广顶 等;《物理学报》;20091231;第58卷(第12期);8249-8253 * |
| 葛广顶 等.时间反演电磁波超分辨率特性.《物理学报》.2009,第58卷(第12期),8249-8253. |
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