CN103474776B - A kind of method producing radio frequency orbital angular momentum wave beam based on annular traveling wave antenna - Google Patents
A kind of method producing radio frequency orbital angular momentum wave beam based on annular traveling wave antenna Download PDFInfo
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Abstract
The present invention relates to a kind of method producing radio frequency orbital angular momentum wave beam based on annular traveling wave antenna.Annular traveling wave antenna of the present invention is in annular in spatial distribution, and annulus is symmetrical around Z axis, and on annulus, each point driving source amplitude is consistent, and phase place circumferentially meets exp (il
) distribution, antenna excitation source is row wave traveling on annulus, the radiation of this annular traveling wave antenna in space can produce the radio frequency OAM wave beam with the identical exponent number of l in its PHASE DISTRIBUTION, and on adjustment annulus, the distribution of each point phase place, then can produce the radio frequency OAM wave beam of different l exponent number.The method that the present invention proposes can be used for OAM wireless communication system, mutually integrated with existing communication technology, substantially increases the capacity of communication system.
Description
Technical field
The invention belongs to OAM wireless communication technology field, relate to a kind of production method of the radio frequency OAM wave beam based on annular traveling wave antenna.
Background technology
Along with the whole world enters the mobile Internet epoch, the spectral gaps of mobile communication business is day by day serious.Because the high-quality frequency spectrum resource of low-frequency range is very limited, be difficult to by means of only the new frequency spectrum of division the new demand meeting mobile communication.In this case, develop new technology and seem particularly important with the service efficiency improving bit/hertz.At present, people are carrying out large quantifier elimination based on dimensions such as electromagnetic frequency spectrum, phase place, amplitudes to expand in information capacity resource, as improved availability of frequency spectrum novel intelligent wireless communication technology---cognitive radio; Improve the high-order coherent modulation of the signal of single spectrum of carrier efficiency, make spectrum efficiency improve the multi-transceiver technology of nearly a times than tandem system, and not only can increase spectrum efficiency but also the MIMO communication technology of the channel capacity that is multiplied etc.Obviously the capacity resource based on frequency spectrum, phase place, these dimensions of amplitude has obtained development and utilization comparatively fully.Although can also proceed in the gradual dilatation of these dimensions, the significantly dilatation of several order of magnitude be realized, there is no sufficient space.Therefore, find new physical parameter dimension and realize electromagnetic communication technology, in limited spectrum resources, meet message capacity is the demand that the order of magnitude increases, and is a great Science and Technology challenge.Orbital angular momentum (OAM) radio communication is arisen at the historic moment exactly in this opportunity.
Electromagnetic wave not only has energy, but also has orbital angular momentum, and orbital angular momentum is electromagnetic basic physical attribute, and reflection electromagnetic wave is around the phase place running parameter of the azimuth direction of direction of propagation axle.For the electromagnetic wave of optional frequency, whole OAM wave beam forms one group of mutually orthogonal, unlimited many eigenmodes of number.OAM communication is exactly the exponent number (value l) utilizing this group electromagnetic wave eigenmodes of OAM pattern, as new Gong modulation or multiplexing parameter dimensions resource, namely utilize different l value to represent different coding state or different information channel, thus open up the new way improving spectrum efficiency further.Because l value has unlimited span, OAM communication has the potentiality that infinitely can increase electromagnetic wave beared information amount in theory.
Utilize this parameter dimensions of radio frequency OAM to be applied to wireless communication field at present and be still in the starting stage, great majority research lays particular emphasis on theory analysis, the production method of development different rank radio frequency OAM wave beam and corresponding device are the checking OAM ripple free space characteristics of channel, realize the basis of radio frequency OAM wireless communication system.Up to now, most of OAM wave beam production method all comes from the circular antenna array thinking of the designs such as Thide in 2007, but the OAM wave beam exponent number that the method produces is subject to the quantitative limitation of circular antenna array number, suppose that the number of circular antenna array is N, its OAM wave beam exponent number l produced must be less than N/2, has very important significance so seek a kind of simple radio frequency OAM wave beam production method for the radio frequency OAM high-speed communication in future.
Summary of the invention
The object of the present invention is to provide a kind of production method of the radio frequency OAM wave beam based on annular traveling wave antenna and based on the method realize OAM wave beam multiplexing.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of production method of the radio frequency OAM wave beam based on annular traveling wave antenna:
No matter any one antenna is electric type source antenna or magnetic-type source antenna, as long as its spatial distribution is annular, annulus is symmetrical around Z axis, and on annulus, each point driving source amplitude is consistent, and phase place, along annular ring peripheral each point consecutive variations, meets
distribution, wherein
be angle of circumference, l is integer, just can be or is negative, and such antenna may be defined as annular traveling wave antenna.Namely antenna excitation source is in row wave traveling on annulus, and the symbol difference of l represents antenna excitation source on annulus in clockwise or anticlockwise row wave traveling.Through electromagnetism numerical computations, the radiation in space of this kind of annular traveling wave antenna can produce has helical phase
l rank radio frequency OAM wave beam, l just also can be or is being negative.Radio frequency wherein comprises microwave band and millimeter wave band.
The beneficial effect that the present invention has compared with background technology is:
The present invention is directed to communication service frequency spectrum resource breach serious problems, propose a kind of production method of new radio frequency OAM wave beam, this invention can be used for OAM wireless communication system, mutually integrated with existing communication technology, greatly improves the capacity of communication system.Compared with realizing OAM wave beam production method with circular antenna array conventional in background technology, the radio frequency OAM wave beam production method that the present invention proposes is not limited to array antenna number, can realize the generation of any exponent number radio frequency OAM wave beam.In addition, integrated by multiple annular traveling wave antenna, can realize the design of the required OAM wave beam multiplexer of OAM high-speed communication, reach the multiplexing of different rank radio frequency OAM wave beam.PHASE DISTRIBUTION on the annular traveling wave antenna required in the present invention
be easy to realize, and reach requirement by multiple technologies, avoid in background technology, utilizing circular antenna array to produce in OAM method the demand that each array element precise phase controls.The present invention, for structure radio frequency OAM wireless communication system, promotes that the practical of radio frequency OAM wireless communication system has very important effect.
Accompanying drawing explanation
Fig. 1 is electric type source row ripple loop aerial structural representation;
Fig. 2 is the transformational relation of spherical coordinates and rectangular coordinate in numerical computations;
Fig. 3 is that antenna current meets
distribution, during l=2, the PHASE DISTRIBUTION figure of z=1000 λ electric field;
Fig. 4 is that antenna current meets
distribution, during l=3, the PHASE DISTRIBUTION figure of z=1000 λ electric field;
Fig. 5 is that antenna current meets
distribution, during l=4, the PHASE DISTRIBUTION figure of z=1000 λ electric field;
Fig. 6 is that antenna current meets
distribution, during l=5, the PHASE DISTRIBUTION figure of z=1000 λ electric field;
Fig. 7 is a kind of annular traveling wave antenna example structure chart producing radio frequency OAM wave beam.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described:
1. based on the generation of the radio frequency OAM wave beam of annular traveling wave antenna.
Suppose that annular traveling wave antenna is electric type source antenna, as shown in Figure 1, the CURRENT DISTRIBUTION on antenna meets
distribution, calculate this annular traveling wave antenna radiation field in space.
Basic ideas are: circular loop antenna is divided into N section, ensure every a bit of antenna length Δ L<< wavelength X, because current amplitude is identical on this segment antenna, phase place also can be considered identical, then this miniature antenna can be used as electric dipole, its far-field radiation in space can calculate with the far-field radiation formula of electrical dipole antenna, as follows:
In above formula, spherical coordinates unit vector r
0, θ
0,
with rectangular coordinate x
0, y
0, z
0conversion see Fig. 2, electrical dipole antenna is placed on initial point along z-axis.
Calculate the radiation field of annular traveling-wave antenna, must superimposed for the radiation field of N section miniature antenna on whole annulus.Consider that the placement location of every a bit of antenna is different, namely the coordinate of above-mentioned radiation field company is different, be difficult to after coordinate transform obtain analytic solutions, method of value solving is adopted in the present invention, calculate the distribution map of the electric field of this annular traveling wave antenna in space, judge whether by the phase place change of electric field the radio frequency OAM wave beam producing different l exponent number.
Fig. 3 ~ Fig. 6 gives annular traveling wave antenna current and meets
distribution, l=2,3,4, the PHASE DISTRIBUTION figure of electric field when aerial radiation propagates 1000 λ along z-axis when 5.Visible, electric field phase presents vortex characteristic around the change of the angle of circumference of direction of propagation axle, and the electric field phase circumferentially satisfied 2 π l of a circle change, namely during l=2, electric field phase is circle change 4 π circumferentially; During l=3, electric field phase is circle change 6 π circumferentially; During l=4, electric field phase is circle change 8 π circumferentially; During l=5, electric field phase is circle change 10 π circumferentially, by that analogy.This feature proves that this kind of annular traveling wave antenna can produce the radio frequency OAM wave beam of any l exponent number, as long as the CURRENT DISTRIBUTION on antenna meets
l is integer.
When this type of annular traveling wave antenna is magnetic-type source antenna, according to electromagnetic duality principle, same conclusion can be obtained, as long as the driving source of antenna meets annular traveling wave distribution, namely meet
distribution, just can produce the radio frequency OAM wave beam of l exponent number in space.
2. an annular traveling wave antenna embodiment
The annular traveling wave antenna of the produced radio frequency OAM wave beam of the present invention's definition realizes easily via the design of structure, realize OAM wave beam production method compared to circular antenna array conventional in background technology to need accurately to control this point to the phase place of each array, method of the present invention is more easy.Fig. 7 is an embodiment that can produce the annular traveling wave antenna of radio frequency OAM wave beam.This antenna body structure is the metal ring chamber that an end face opens an annular slot, and becket die cavity can be regarded as and be formed by rectangular waveguide bending, and profile height is the broadside of rectangular waveguide, and end face width is the narrow limit of rectangular waveguide, is operated in TE
10pattern, the centre of place for narrow limit of cracking.In becket die cavity side at a distance of external two metal waveguides of quarter turn place opening as excitation port 1 and excitation port 2, when inputting same frequency in excitation port 1 and 2, the microwave source of phase ± 90 °, the electromagnetic field in metal ring chamber circumferentially becomes the row wavelength-division cloth of clockwise or counterclockwise propagation.The size of appropriate design becket die cavity, makes the longitudinal propagation constant k of former rectangular waveguide
zmeet k
zr=l, l are integer, and R is the radius cracked in ring-like chamber, then the magnetic current at place of cracking circumferentially meets
distribution, the annulus now on wire chamber cracks and is equivalent to a magnetic-type source antenna, outside radiated electromagnetic wave, produces the OAM wave beam that exponent number is l in space.Equally also can design electric type source antenna, as long as the current phase distribution on antenna meets
distribution, then can produce the radio frequency OAM wave beam that exponent number is l.
The realization that 3.OAM wave beam is multiplexing
Produce the method for radio frequency OAM wave beam based on annular traveling wave antenna, a kind of phase place has
the antenna of distribution produces the OAM wave beam that exponent number is l, if there is a device, by the appropriate design of structure and material, realizes multiple phase place and has
the combination of the annular traveling wave antenna of distribution, so namely this device can be used as OAM wave beam multiplexer, can produce the OAM wave beam of multiple different l exponent number, thus realize the multiplexing of OAM wave beam, for OAM high-speed communication lays the first stone in space.Annular traveling wave antenna example as shown in Figure 7, can by vary in size becket die cavity realize the superposition of annular traveling wave antenna, realize the multiplexing function of OAM wave beam in space.
Claims (3)
1. produce a method for radio frequency orbital angular momentum wave beam based on annular traveling wave antenna, it is characterized in that: described annular traveling wave antenna is in annular in spatial distribution, and annulus is symmetrical around Z axis, and on annulus, each point driving source amplitude is consistent, and phase place circumferentially meets
distribution,
for angle of circumference, l are integer, the signal that antenna excitation source produces is row wave traveling on annulus, l just can be, also can be negative, the difference of symbol represents antenna excitation source on annulus in clockwise or anticlockwise row wave traveling, the radiation of this annular traveling wave antenna in space can produce the radio frequency OAM wave beam with the identical exponent number of l in its PHASE DISTRIBUTION, and on adjustment annulus, the distribution of each point phase place, then can produce the radio frequency OAM wave beam of different l exponent number.
2. a kind of method producing radio frequency orbital angular momentum wave beam based on annular traveling wave antenna according to claim 1, is characterized in that: described antenna excitation source is electric type source or magnetic-type source.
3. a kind of method producing radio frequency orbital angular momentum wave beam based on annular traveling wave antenna according to claim 1, is characterized in that: described radio frequency OAM wave beam comprises microwave and millimeter wave frequency band.
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| CN103474777B (en) | 2013-09-22 | 2015-07-22 | 浙江大学 | Loop traveling wave antenna generating radio frequency OAM on basis of metal ring cavity |
| CN103812543B (en) * | 2014-01-27 | 2017-01-11 | 华中科技大学 | Method of improving wireless communication capacity by orbital angular momentum |
| CN103986531B (en) * | 2014-04-28 | 2019-04-02 | 北京邮电大学 | A kind of the axis alignment adjusting method and its system of orbital angular momentum wireless communication system |
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| CN104601214B (en) * | 2014-12-30 | 2017-10-13 | 浙江大学 | A kind of sampling method of reseptance demultiplexed for radio frequency orbital angular momentum pattern |
| CN104953254B (en) * | 2015-07-09 | 2018-01-05 | 浙江大学 | The antenna of radio frequency orbital angular momentum wave beam is produced based on dielectric resonator |
| CN105049169B (en) * | 2015-07-31 | 2019-01-18 | 上海卫星工程研究所 | Based on the OAM high bit rate star being multiplexed with frequency data safe transmission method |
| CN105471803B (en) * | 2015-12-09 | 2019-02-01 | 深圳大学 | A kind of millimeter wave High Speed Modulation demodulating system and method based on antenna array |
| CN105470638B (en) * | 2016-01-13 | 2019-04-02 | 复旦大学 | A kind of radial direction battle array orbital angular momentum multimode multiplexing antenna |
| CN106025566B (en) * | 2016-05-30 | 2018-10-02 | 哈尔滨工业大学 | Surpass the lens and method that surface generates vortex wave beam based on reflection-type |
| CN106229618A (en) * | 2016-08-10 | 2016-12-14 | 电子科技大学 | For producing annular ellipse microstrip structure antenna and the multiplexer of radio frequency OAM wave beam |
| CN106329105B (en) * | 2016-09-27 | 2017-09-12 | 华中科技大学 | A kind of annular slot antenna for being used to produce OAM ripples |
| CN107611600A (en) * | 2017-08-08 | 2018-01-19 | 西安电子科技大学 | A kind of SIW annular slot antennas for producing bimodulus OAM vortex electromagnetic waves |
| CN108282208B (en) * | 2017-12-15 | 2020-11-10 | 西安电子科技大学 | Wave beam calibration method of uniform circular phased antenna array in OAM communication system |
| US10715243B2 (en) * | 2018-10-19 | 2020-07-14 | Huawei Technologies Co., Ltd. | Pseudo-doppler receiving architecture for OAM and MIMO transmissions |
| CN110336123B (en) * | 2019-05-13 | 2020-12-25 | 浙江大学 | Antenna based on medium integrated waveguide radial propagation multimode OAM wave beam |
| CN110165407B (en) * | 2019-05-30 | 2020-10-16 | 浙江大学 | Multimode planar spiral OAM antenna with TM ring-shaped resonant cavity and paraboloid of revolution |
| CN111276805B (en) * | 2020-02-11 | 2021-04-06 | 浙江大学 | Method for generating structural electromagnetic wave beams based on partial circular ring traveling wave antenna theory |
| CN111293422B (en) * | 2020-02-20 | 2021-03-30 | 浙江大学 | Antenna for generating OAM mode group based on curved waveguide part slotting |
| EP4200939A4 (en) * | 2020-08-19 | 2024-05-08 | QUALCOMM Incorporated | Generating and steering orbital angular momentum beams |
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| US8706914B2 (en) * | 2007-04-23 | 2014-04-22 | David D. Duchesneau | Computing infrastructure |
| EP2656442A1 (en) * | 2010-12-22 | 2013-10-30 | Telefonaktiebolaget LM Ericsson (PUBL) | An antenna arrangement |
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|---|---|---|---|---|
| GB2410130A (en) * | 2004-01-19 | 2005-07-20 | Roke Manor Research | Planar phased array radio antenna for orbital angular momentum (OAM) vortex modes |
| WO2012175629A1 (en) * | 2011-06-24 | 2012-12-27 | Università Degli Studi Di Padova | A telecommunication method and apparatus exploiting the transmission and reception of electromagnetic waves |
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