CN107204752B - Method for realizing vortex beam coding, decoding and communication based on metamaterial module - Google Patents
Method for realizing vortex beam coding, decoding and communication based on metamaterial module Download PDFInfo
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Abstract
The invention relates to a method for realizing vortex beam coding, decoding and communication based on a metamaterial module, which adopts vortex beams to code digital signals to realize communication and comprises the following steps of establishing a group of fixed vortex beam mode bases in a communication protocol; the signal source outputs a digital signal sequence; based on the digital signal sequence, dynamic voltage regulation and control are carried out on the metamaterial module, so that radio-frequency signals emitted by the radio-frequency source irradiate on the metamaterial module, reflected waves are converted into a superposition state of a plurality of vortex beam modes and are emitted, and the vortex beams encode the digital signals. And the vortex wave beams are converted into plane waves through the feed and level judgment of the metamaterial module, so that the decoding is realized. And realizing communication by utilizing the coding and decoding modes. The invention realizes large-capacity coding, decoding and communication by using devices with smaller sizes, and has low difficulty in the links of transmitting and receiving information and large amount of transmitted information.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for realizing vortex beam coding, decoding and communication based on a metamaterial module.
Background
Vortex beams are a special class of beams whose wave fronts are helical. Theoretically, the vortex electromagnetic wave beam is a special wave beam solution of Maxwell equation set, and the electromagnetic field expression is as follows:
where A (r) is the amplitude of the electromagnetic field, r represents a position vector,
is the phase factor, i represents an imaginary number,
representing the azimuth angle, m is called the topological charge of the vortex beam. The vortex beams with different topological loads meet the orthogonal relation, so that the vortex beams are more and more used in the field of wireless communication, and the communication capacity can be greatly improved through vortex beam mode coding. The generation of vortex beams is a key link in the application of vortex beam multiplexing communication, the generation of the vortex beams depends on the amplitude phase distribution regulation of a radiation oral surface electromagnetic field, and the generation of the existing vortex beams is mainly realized by a spiral phase plate, a microstrip line array and the like. The spiral phase plate controls the angular phase distribution of emergent electromagnetic waves through the spiral design of the surface of a medium, realizes the emission of vortex beams of a certain specific order, has single emission modulus, and cannot meet the generation of multi-mode vortex beams; the phase shift of the microstrip line array is realized by a delay circuit, and the power division and the phase shift of signals are realized by utilizing a delay phase shift network, so that the amplitude and the phase distribution on the microstrip line antenna array radiation array element are controlled, the circuit load is large, the device size is large, and the regulation and control precision is low.
At present, only a design idea of performing communication by using a vortex beam mode as a carrier wave is provided, and the utilization rate of a communication frequency spectrum is improved by multiplexing a plurality of vortex beam modes in the same frequency band. This method has the following major disadvantages:
1. the vortex beam field distribution has a divergent characteristic, different modes have different divergent angles, so that antenna arrays with different radiuses are required to be used for receiving and identifying information of each mode in the same time period, and the feasibility in actual operation is low;
2. the transmitting device of the multi-mode vortex beam is realized by adopting the traditional technology, the size of the device is larger, the regulation and control precision is low, the regulation and control of a single mode can be realized, and complicated design is required to be added if the simultaneous transmission of a plurality of modes is realized.
Disclosure of Invention
In view of the foregoing analysis, the present invention is directed to a method for implementing vortex beam encoding, decoding and communication based on a metamaterial module, so as to solve the problem of complicated design of single or multi-mode modulation mode in the prior art.
The purpose of the invention is mainly realized by the following technical scheme:
the method for realizing vortex beam coding based on the metamaterial module adopts vortex beams to code digital information to realize communication, and comprises the following steps of:
step S1, establishing a set of fixed vortex beam pattern bases { φ [ [ phi ] O ] in a communication protocol1,φ2,φ3...φNTherein of
Representing a field distribution function of the nth order vortex beam; n-1, 2,3, … …, N;
representing the azimuth in polar coordinates;
step S2, in each clock period T, the signal source outputs N-bit digital signal sequence Sc；
Step S3, based on the digital signal sequence ScDynamic voltage regulation is carried out on the metamaterial module to enable the radio-frequency signal S emitted by the radio-frequency sourceiAfter the reflected waves irradiate on the metamaterial module, the reflected waves are converted into a superposition state of a plurality of vortex beam modes and are emitted out, and the vortex beams encode digital signals.
Further, the step S3 includes:
step S301, according to the input digital signal sequence ScObtaining the DC voltage V to be applied to two ends of the ferroelectric substrate of each metamaterial module uniti；
Step S302, outputting a DC voltage ViTo the corresponding metamaterialA feed layer of the module unit for dynamically regulating and controlling voltage of the metamaterial module to make the radio-frequency signal S emitted by the radio-frequency sourceiAfter the reflected waves irradiate on the metamaterial module, the reflected waves are converted into a superposition state of a plurality of vortex beam modes and are emitted out, and the vortex beams encode digital signals.
Further, the step S301 includes the following sub-steps:
step S3011, according to the input digital signal sequence ScObtaining the reflection phase distribution of the surface of the metamaterial module
AnNormalized intensity coefficients representing the vortex beams of the respective modes, intensity coefficients of each mode and the sequence S of digital signalscOne-to-one correspondence is realized;
step S3012, according to the metamaterial module surface reflection phase distribution
Obtaining the corresponding reflection phase of the metamaterial module unit surface at each corresponding position
Step S3013, according to the reflection phase corresponding to each module unit surface
The dielectric constant ∈ of the ferroelectric material substrate in the corresponding metamaterial module unit is obtained through calculationfe；
Step S3014, ∈ according to the dielectric constant of the ferroelectric material substrate in each metamaterial module unitfeUsing the dielectric constant ∈ of ferroelectric materialfeRelation ∈ between applied voltage Vfe(V) obtaining the direct current voltage V required to be applied to two ends of the ferroelectric material substrate in each metamaterial module uniti。
Furthermore, the metamaterial module unit comprises a metal resonance unit, a feed unit, a ferroelectric material substrate, a ground layer, a dielectric layer and a feed layer; the metal resonance unit and the feed unit are arranged on the ferroelectric material substrate, a grounding layer is arranged below the ferroelectric material substrate, and a dielectric layer is arranged between the grounding layer and the feed layer; the metal resonance unit comprises a metal sheet and a metalized through hole, and the metal sheet is connected with the ground layer through the metalized through hole; the feed unit is connected with the feed layer through a feed pin; the feed layer applies voltage to the feed unit through the feed pin, so that a certain direct current voltage is formed between the feed unit and the grounding layer, and the direct current voltage is used for adjusting the dielectric constant of the ferroelectric material substrate to change the reflection phase of the surface of each metamaterial module unit, so that the phase distribution of the surface of the whole metamaterial module is constructed.
Further, the feeding unit is a feeding line, a feeding ring or a feeding sheet.
Furthermore, the metal sheet is of a square structure, and the side length of the metal sheet is equal to the thickness of the ferroelectric material substrate.
Further, in step S301, the FPGA is connected to the power supply module, and the FPGA controls the power supply module to output the dc voltage ViTo the feeding layer of the respective metamaterial modular unit.
The invention also provides a method for realizing vortex beam decoding based on the coding method, and vortex beams
Transmitting the voltage distribution to the surface of the metamaterial module, and obtaining the voltage distribution of each order of vortex beam according to the field distribution function of each order of vortex beam in the communication protocol; outputting voltages with corresponding sizes to the feed layers of the metamaterial module units at corresponding positions under the control of the FPGA according to the voltage distribution, so that the surface reflection phase distribution of the metamaterial module units corresponds to the phase distribution of each order of vortex wave beam, and the conversion from the N-order vortex wave beam to the plane wave is realized; when the conversion from the nth order vortex wave beam to the plane wave is realized, setting a judgment level at the output end, so that the output level is higher than the judgment level and is judged to be '1', otherwise, the output level is judged to be '0'; in a clock period T, sequential judgment of all modes is realized, and a series of high-low level signals are output according to the sequence of N being 1,2 and 3 … N, namely the signal source output is outputN-bit digital signal sequence Sc。
Furthermore, the metamaterial module adopted in the decoding method has the same structure as the metamaterial module adopted in the encoding method.
On the basis of the coding method and the decoding method, the invention also provides a method for realizing vortex beam communication by adopting the coding method at a transmitting end and the decoding method at a receiving end.
The invention has the following beneficial effects:
1. the vortex beam coding is utilized to realize large-capacity communication, compared with the traditional vortex beam carrier multiplexing technology, the difficulty of the information receiving link is low, the information of each mode does not need to be obtained in the same time period, and the required information can be extracted only by identifying the strength change of each vortex beam mode in different time periods.
2. The invention can realize the mode regulation and control with extremely high precision by using smaller device size, and can also realize the dynamic regulation and control of a plurality of vortex beam modes.
3. The orthogonality among N vortex beams used in the invention can be realized in the same extremely narrow frequency band, so that the occupied frequency resource is very limited during communication, the corresponding spectrum utilization efficiency is very high, and the spectrum utilization efficiency is in direct proportion to N in principle. When a broadband signal needs to be transmitted, that is, the binary number N transmitted in each clock cycle is large, the traditional communication method inevitably leads to the equal-proportion broadening of the analog signal frequency band, and by using the method provided by the invention, only more orthogonal vortex beam modes are needed for coding, and the occupied frequency band does not need any broadening, thereby ensuring the equal-proportion promotion of the spectrum utilization efficiency.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of vortex beam encoding, decoding and communication methods according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a metamaterial module according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a metamaterial module unit according to an embodiment of the invention.
Fig. 4 is a schematic diagram of output level determination according to the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
Implementation 1: as shown in fig. 1, the method for implementing vortex beam coding based on a metamaterial module, which uses a vortex beam to code digital information to implement communication, includes the following steps:
step S1, establishing a set of fixed vortex beam pattern bases { φ [ [ phi ] O ] in a communication protocol1,φ2,φ3...φNTherein of
Representing a field distribution function of the nth order vortex beam; n-1, 2,3, … …, N;
representing the azimuth in polar coordinates;
step S2, in each clock period T, the signal source outputs N-bit digital signal sequence Sc＝{0 1 0 ... 0}；
Step S3, based on the digital signal sequence ScAnd (010.. 0), performing dynamic voltage regulation on the metamaterial module to enable the radio-frequency signal S emitted by the radio-frequency source to be transmittediAfter irradiating the metamaterial module, converting the reflected wave into a superposition state of a plurality of vortex beam modes and emitting the superposition state to realize vortex beamsEncoding of digital signals.
The method specifically comprises the following steps:
step S301, according to the input digital signal sequence ScObtaining a direct current voltage V required to be applied to two ends of a ferroelectric substrate of each metamaterial module uniti；
The method specifically comprises the following substeps:
step S3011, according to the input digital signal sequence ScObtaining a metamaterial module surface reflection phase distribution function { 010.. 0}
I.e. the output electromagnetic wave mode, in which
Representing the field distribution function of the nth order vortex beam,
represents the azimuth in polar coordinates, N ═ 1,2,3, … …, N; a. thenNormalized intensity coefficients representing the vortex beams of the respective modes, intensity coefficients of each mode and the sequence S of digital signalscOne to one correspondence, i.e. { A1，A2，A3... AN}＝{0 1 0 ... 0}；
Step S3012, according to the metamaterial module surface reflection phase distribution
Obtaining the corresponding reflection phase of the metamaterial module unit surface at each corresponding position
The metamaterial module is formed by arranging a plurality of metamaterial module units;
in this embodiment, the metamaterial module is composed of 10 × 10 metamaterial module units, and as shown in fig. 2, the reflection phase corresponding to the surface of each module unit is obtained according to the overall reflection phase distribution.
Step S3013, according toReflection phase corresponding to surface of each module unit
The dielectric constant ∈ of the ferroelectric material substrate in the corresponding metamaterial module unit is obtained through calculationfe(ii) a The relationship between the reflection phase and the dielectric constant can be obtained by various conventional methods.
Step S3014, ∈ according to the dielectric constant of the ferroelectric material substratefeUsing the dielectric constant ∈ of ferroelectric materialfeRelation ∈ between applied voltage Vfe(V) obtaining the direct current voltage V required to be applied to two ends of the ferroelectric material substrate in each metamaterial module unitiDielectric constant ∈ of ferroelectric materialfeThe relationship with the applied voltage V can be obtained in advance by experiments.
As shown in fig. 3, the metamaterial module unit includes a metal resonance unit 1, a feeding unit 2, a ferroelectric material substrate 3, a ground layer 4, a dielectric layer 5 and a feeding layer 7, the metal resonance unit 1 and the feeding unit 2 are disposed on the ferroelectric material substrate 3, the ground layer 4 is disposed below the ferroelectric material substrate 3, the dielectric layer 5 is disposed between the ground layer 4 and the feeding layer 7, the dielectric layer 5 is used for supporting the feeding layer and the ground layer, the metal resonance unit includes a metal sheet and a metalized via hole, the metal sheet is connected to the ground layer through the metalized via hole, the feeding unit is connected to the feeding layer through a feeding pin 6, the feeding layer applies a voltage to the feeding unit through the feeding pin, so that a certain dc voltage is formed between the feeding unit and the ground layer, the dc voltage is used for adjusting a dielectric constant of the ferroelectric material substrate to change a reflection phase of each metamaterial module unit surface, and further construct a phase distribution of the entire metamaterial module surface, the feeding unit can select a linear, annular, sheet-like structure, and the square annular structure of the metamaterial module unit can be set to change a phase range of phi of a specific dielectric constant ∈ -180 degreesfeTherefore, the reflection phase of each metamaterial module unit surface can be changed by applying direct current voltage to the ferroelectric material substrate to change the dielectric constant of the ferroelectric material substrateAnd constructing the phase distribution of the whole metamaterial module surface.
In this embodiment, the metal sheet is square, and the side length is equal to the thickness of the ferroelectric material substrate.
Step S302, the FPGA controls the voltage module to output direct current voltage ViFeeding all the metamaterial module units to the feeding layer of the corresponding metamaterial module unit to input radio-frequency signals SiConversion to N vortex beam superposition states
And is transmitted out; and the vortex beam is used for coding the digital signal.
In particular, a radio frequency signal SiEmitting a radio frequency signal S to the surface of the metamaterial module by a radio frequency source, and feeding the radio frequency signal S to the metamaterial moduleiConversion to N vortex beam superposition states
The radio frequency source is a horn antenna or a microstrip antenna or other conventional radio frequency radiation device, and the radio frequency signal SiMay be a common gaussian beam.
Specifically, the FPGA has a plurality of pins, and a control mode of controlling a unit voltage of the metamaterial module by each pin is adopted.
The method converts radio frequency signals into vortex beam signals in a voltage regulation and control mode, adopts the vortex beam to transmit digital information, and provides a foundation for large-capacity data transmission. The orthogonality among the N types of vortex beams can be realized in the same extremely narrow frequency band, so that the frequency resources occupied by the encoding for communication are very limited, the corresponding spectrum utilization efficiency is very high, and the spectrum utilization efficiency is in direct proportion to N in principle. When a broadband signal needs to be transmitted, that is, the binary number N transmitted in each clock cycle is large, the traditional communication method inevitably leads to the equal-proportion broadening of the analog signal frequency band, and by using the method provided by the invention, only more orthogonal vortex beam modes are needed for coding, and the occupied frequency band does not need any broadening, thereby ensuring the equal-proportion promotion of the spectrum utilization efficiency.
The present invention also improves the way in which the vortex beam decoding identifies the individual mode information. The decoding method has the same communication protocol as the encoding method of embodiment 1, i.e., a set of vortex beam pattern bases { phi [ ], are established1,φ2,φ3...φNIs the same as the encoding method.
Example 2: as shown in FIG. 1, the transmitting end transmits vortex beams
The receiving end needs to decode and identify each mode information. The method is a method for realizing vortex beam decoding based on a metamaterial module, and the adopted metamaterial module has the same structure as that in the embodiment 1. Vortex beam
Transmitting the voltage distribution to the surface of the metamaterial module, and obtaining the voltage distribution of each order of vortex beam according to the field distribution function of each order of vortex beam in the communication protocol; according to the voltage distribution, the power supply module outputs voltage with corresponding magnitude to the feed layer of the metamaterial module unit at the corresponding position under the control of the FPGA, so that the surface reflection phase distribution of the metamaterial module unit corresponds to the phase distribution of each order of vortex wave beam, and the conversion from the N-order vortex wave beam to the plane wave is realized. As shown in fig. 4, when the conversion from the nth order vortex beam to the plane wave is implemented, only the nth order vortex beam component in the signal can be radiated in a matched manner, which is reflected as a large output level, and the radiation efficiency is greatly reduced due to the mismatch of the components of the other modes, which is reflected as a small output level. Therefore, appropriate decision levels are set at the output end aiming at different vortex modes, so that the output level is higher than the decision level and is judged to be '1', and if the output level is not higher than the decision level and is judged to be '0', the filtration of the nth order vortex wave beam can be realized. And so on, in one clock period T, all N are realizedThe sequential discrimination of the patterns outputs a series of high-low level signals in the order of N being 1,2,3 … N. The level signal sequence and the input signal S of the transmitting terminalcIdentical, therefore, vortex beam decoding is achieved.
The receiving end metamaterial module reflects vortex beams in different modes in wave signals through dynamic scanning in a phase distribution mode, sequentially converts the vortex beams into plane waves according to a scanning time sequence, and respectively carries out amplitude judgment to obtain a series of binary bit data streams.
Example 3:
the vortex beam encoding method of the embodiment 1 is adopted at the transmitting end, and the vortex beam decoding method of the embodiment 2 is adopted at the receiving end, so that the whole process of communication by adopting the vortex beam is realized.
And circulating according to the process to realize the process of utilizing the vortex beam to carry out coding communication.
Because the orthogonality among the N vortex beams used in the communication method can be realized in the same extremely narrow frequency band, the frequency resources occupied by the communication process are very limited, the corresponding spectrum utilization efficiency is also very high, and the spectrum utilization efficiency is in direct proportion to N in principle. When a broadband signal needs to be transmitted, that is, the binary number N transmitted in each clock cycle is large, the traditional communication method inevitably leads to the equal-proportion broadening of the analog signal frequency band, and by using the method provided by the invention, only more orthogonal vortex beam modes are needed for coding, and the occupied frequency band does not need any broadening, thereby ensuring the equal-proportion promotion of the spectrum utilization efficiency.
In summary, embodiments of the present invention provide a method for encoding, decoding, and communicating using a vortex beam, which can implement large capacity communication, and compared with the conventional vortex beam carrier multiplexing technology, the method has low difficulty in the steps of sending and receiving information, and does not need to obtain information of each mode at the same time interval, and only needs to identify the intensity change of each vortex beam mode at different time intervals to extract the required information.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (8)
1. The method for realizing vortex beam coding based on the metamaterial module is characterized by comprising the following steps: the method for realizing communication by encoding digital signals by vortex beams comprises the following steps:
step S1, establishing a set of fixed vortex beam pattern bases { φ [ [ phi ] O ] in a communication protocol1,φ2,φ3...φNTherein of
Representing a field distribution function of the nth order vortex beam; n-1, 2,3, … …, N;
representing the azimuth in polar coordinates;
step S2, in each clock period T, the signal source outputs N-bit digital signal sequence Sc；
Step S3, based on the digital signal sequence ScDynamic voltage regulation is carried out on the metamaterial module to enable the radio-frequency signal S emitted by the radio-frequency sourceiAfter the reflected waves irradiate on the metamaterial module, the reflected waves are converted into a superposition state of a plurality of vortex beam modes and are emitted out, and the vortex beams encode digital signals; the method comprises the following steps:
step S301, according to the input digital signal sequence ScObtaining the required application at both ends of the ferroelectric substrate of each metamaterial module unitD.c. voltage Vi(ii) a The method specifically comprises the following substeps:
step S3011, according to the input digital signal sequence ScObtaining the reflection phase distribution of the surface of the metamaterial module
AnNormalized intensity coefficients representing the vortex beams of the respective modes, intensity coefficients of each mode and the sequence S of digital signalscOne-to-one correspondence is realized;
step S3012, according to the metamaterial module surface reflection phase distribution
Obtaining the corresponding reflection phase of the metamaterial module unit surface at each corresponding position
The metamaterial module is formed by arranging a plurality of metamaterial module units;
step S3013, according to the reflection phase corresponding to each module unit surface
The dielectric constant ∈ of the ferroelectric material substrate in the corresponding metamaterial module unit is obtained through calculationfe；
Step S3014, ∈ according to the dielectric constant of the ferroelectric material substrate in each metamaterial module unitfeUsing the dielectric constant ∈ of ferroelectric materialfeRelation ∈ between applied voltage Vfe(V) obtaining the direct current voltage V required to be applied to two ends of the ferroelectric material substrate in each metamaterial module uniti；
Step S302, outputting a DC voltage ViTo the feed layer of the corresponding metamaterial module unit, dynamic voltage regulation and control are carried out on the metamaterial module to enable the radio-frequency signal S emitted by the radio-frequency sourceiAfter the reflected waves irradiate on the metamaterial module, the reflected waves are converted into a superposition state of a plurality of vortex beam modes and are emitted out, and the digital signals are encoded by the vortex beams。
2. The method of claim 1, wherein:
the metamaterial module unit comprises a metal resonance unit, a feed unit, a ferroelectric material substrate, a ground layer, a dielectric layer and a feed layer; the metal resonance unit and the feed unit are arranged on the ferroelectric material substrate, a grounding layer is arranged below the ferroelectric material substrate, and a dielectric layer is arranged between the grounding layer and the feed layer; the metal resonance unit comprises a metal sheet and a metalized through hole, and the metal sheet is connected with the ground layer through the metalized through hole; the feed unit is connected with the feed layer through a feed pin; the feed layer applies voltage to the feed unit through the feed pin, so that a certain direct current voltage is formed between the feed unit and the grounding layer, and the direct current voltage is used for adjusting the dielectric constant of the ferroelectric material substrate to change the reflection phase of the surface of each metamaterial module unit, so that the phase distribution of the surface of the whole metamaterial module is constructed.
3. A method for performing vortex beam encoding according to claim 2, wherein:
the feed unit is a feed line, a feed ring or a feed sheet.
4. A method for performing vortex beam encoding according to claim 2, wherein:
the metal sheet is of a square structure, and the side length of the metal sheet is equal to the thickness of the ferroelectric material substrate.
5. The method of claim 1, wherein:
step S302, an FPGA is set to be connected with a power supply module, and the FPGA is adopted to control the power supply module to output direct-current voltage ViTo the feeding layer of the respective metamaterial modular unit.
6. A method of vortex beam decoding corresponding to the encoding method of any of claims 1 to 5, characterized by: vortex beam transmissionThe voltage distribution of each order of vortex beam is obtained according to the field distribution function of each order of vortex beam in the communication protocol, wherein the vortex beam is expressed as
According to the voltage distribution, the power supply module outputs voltage with corresponding magnitude to the feed layer of the metamaterial module unit at the corresponding position under the control of the FPGA, so that the surface reflection phase distribution of the metamaterial module unit corresponds to the phase distribution of each order of vortex wave beam, and the conversion from the N-order vortex wave beam to the plane wave is realized; when the conversion from the nth order vortex wave beam to the plane wave is realized, setting a judgment level at the output end, so that the output level is higher than the judgment level and is judged to be '1', otherwise, the output level is judged to be '0'; in a clock period T, sequential judgment of all modes is realized, a series of high-low level signals are output according to the sequence of N being 1,2 and 3 … N, namely an N-bit digital signal sequence S output by a signal sourcec。
7. The method of vortex beam decoding of claim 6, wherein: the metamaterial module in the decoding method is the metamaterial module in any one of claims 1 to 5.
8. The method for realizing vortex beam communication based on the metamaterial module is characterized by comprising the following steps: the method for vortex beam encoding according to any one of claims 1-5 is applied to the transmitting end, and the method for vortex beam decoding according to any one of claims 6-7 is applied to the receiving end.
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