Independent control device and method for dual-beam radiation based on SSPP waveguide

Abstract

The present invention discloses an independent control device and method for dual-beam radiation based on SSPP waveguide, wherein the independent control device for dual-beam radiation based on SSPP waveguide comprises a dielectric substrate, a metal strip located on the upper surface of the dielectric substrate, and a metal floor covering the lower surface of the dielectric substrate. The metal strip structure comprises a coplanar waveguide matching structure at both ends and an artificial surface plasmon structure in the middle. The artificial surface plasmon structure comprises upper and lower sidebands, each sideband comprising a plurality of 45° oblique slotted artificial surface plasmon unit structures arranged according to a composite periodic modulation, the oblique slotted unit structure between the upper and lower sidebands forms an angle of 90°, and the slot depth is designed differently according to requirements. The present invention can realize the independent design of the radiation energy and polarization state of the two beams by respectively designing different modulation factors and initial phase differences of the two beams.

Description

Technical Field

[0001] The present invention belongs to the field of SSPP waveguides, and in particular relates to an independent control device and method for dual-beam radiation based on SSPP waveguides. Background Art

[0002] The response generated by the coupling of electromagnetic waves and free electrons on the metal surface is called surface plasmon. It has subwavelength characteristics in the optical band, can effectively transmit and localize light waves, and is widely used in optical communication systems. In order to achieve this electromagnetic response in the lower frequency bands of millimeter waves and microwave bands, uniform surface plasmon waveguides were then proposed to support and propagate strongly confined surface electromagnetic waves. Its characteristics are very similar to those of surface plasmons and are called artificial surface plasmons. The introduction of this surface plasmon waveguide with ultra-thinness and flexibility has brought new development prospects for the application of compact artificial surface plasmon circuits in microwaves and terahertz. In addition, leaky wave antennas based on artificial surface plasmons have also attracted widespread attention in the academic community in recent years. They have the advantages of low profile, low cost, high directivity, and the characteristics of beam scanning with frequency.

[0003] According to existing research, SSPP-based waveguides can generate leaky wave radiation after periodic modulation, and its radiation energy or polarization state can be flexibly designed. However, these SSPP waveguides designed after periodic modulation can usually only generate single-beam radiation. It is difficult to achieve dual-beam or even multi-beam radiation at the same time when both the radiation energy and polarization mode are designed independently. These limitations have made it difficult to meet the needs of the system. With the rapid development of wireless communications, multi-beam radiation and multi-polarization modulation technologies have received more and more attention, especially in multi-point communications such as satellite communications and personal terminals. In order to simultaneously realize the multi-beam radiation energy and multi-polarization modulation of leaky waves, relevant researchers have made a lot of efforts, but most of the work is based on two-dimensional holographic metasurfaces. Summary of the invention

[0004] The purpose of the present invention is to provide an independent control device and method for dual-beam radiation based on SSPP waveguide, so as to solve the technical problem that the SSPP waveguide after periodic modulation design can usually only produce single-beam radiation, and it is difficult to simultaneously realize dual-beam or even multi-beam radiation when both the radiation energy and the polarization mode are independently designed.

[0005] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0006] An independent control device for dual-beam radiation based on SSPP waveguide, comprising a dielectric substrate, a metal strip located on the upper surface of the dielectric substrate and a metal floor covering the lower surface of the dielectric substrate, wherein the metal strip comprises coplanar waveguide matching structures at both ends and an artificial surface plasmon structure in the middle;

[0007] The coplanar waveguide matching structure includes a gradually inclined slot transition structure symmetrical along the central axis, a gradually inclined slot line structure and an arc structure symmetrically arranged along the central axis are used to realize an equivalent slot line structure, and the gradually inclined slot transition structure is connected to an artificial surface plasmon structure;

[0008] The artificial surface plasmon structure comprises two upper and lower sidebands, and each sideband comprises an artificial surface plasmon unit structure arranged according to a composite periodic modulation.

[0009] Furthermore, the artificial surface plasmon unit structure is a 45° oblique slot unit, and the slot unit structure between the upper and lower side bands of the metal strip forms an angle of 90° and is perpendicular to each other.

[0010] Furthermore, the unit width and the slot width of the artificial surface plasmon unit structure are the same, and the slot depth varies in the range of 0.453 mm to 2.710 mm.

[0011] Furthermore, the cross-sectional shape of the groove of the artificial surface plasmon unit structure along its own axis direction is rectangular, V-shaped or trapezoidal.

[0012] Furthermore, the discontinuous change of the surface impedance of the artificial surface plasmon structure satisfies the following formula:

[0013]

[0014] Where j is the imaginary unit, X s is the average surface impedance of the impedance surface modulated metal strip, M1 is the modulation factor of the first radiation beam, M2 is the modulation factor of the second radiation beam, both range from 0 to 0.23, P1 is the modulation period of the first radiation beam, P2 is the modulation period of the second radiation beam, is the initial phase of the first radiation beam generated by the ±y edges of the SSPP waveguide, is the initial phase of the second radiation beam generated by the ±y sides of the SSPP waveguide, and the x direction is the propagation direction of the electromagnetic wave along the impedance surface; using this formula to design the surface impedance can enable the SSPP waveguide to achieve dual-beam leaky wave radiation.

[0015] Furthermore, the material of the dielectric substrate is F4BM225.

[0016] The independent control method of dual-beam radiation based on SSPP waveguide takes different values ​​of M1 and M2 to correspond to the relative value of the radiation energy of the first radiation beam and the second radiation beam. The ratio of the radiation energy of the first radiation beam to the second radiation beam is equal to M1. 2 :M2 2 ; Take different phase differences between upper and lower sidebands and The value of can correspond to any design of the polarization mode of the first radiation beam and the second radiation beam. When is horizontal linear polarization, When is circular polarization, When is vertical linear polarization;

[0017] When two different modulation factors M1 and M2 are used and the phase difference When the SSPP waveguide has the same artificial surface plasmon structure on both sides and is symmetrical, it generates dual-beam leaky wave radiation with different radiation energies but consistent polarization modes. When they are not zero at the same time, the structures of the artificial surface plasmons on both sides of the SSPP waveguide are asymmetric, generating dual-beam leaky wave radiation with the same radiation energy but different polarization modes.

[0018] The independent control device and method of dual-beam radiation based on SSPP waveguide of the present invention have the following advantages:

[0019] 1. The independent control device of dual-beam radiation based on SSPP waveguide of the present invention combines the impedance surface modulated leaky wave antenna theory and the artificial surface plasmon theory to realize dual-beam radiation in two different directions on a single metal strip of SSPP waveguide.

[0020] 2. The present invention can flexibly design the surface impedance by separately designing the groove depth of the upper and lower artificial surface plasmon unit structures. When different modulation factors and initial phase differences are designed respectively, the radiation energy and polarization mode of the two beams can be independently and arbitrarily designed. The waveguide is simple to manufacture and easy to integrate. Only one photolithography process is required to achieve the design of the performance of two beams at the same time. It has important application prospects in the fields of satellite communications, multi-channel communication networks and wireless network coverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an independent control device for dual-beam radiation based on SSPP waveguide of the present invention;

[0022] Figure 2 It is a schematic diagram of the coplanar waveguide matching structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the arrangement of the artificial surface plasmon unit structure of a 45° oblique slot modulated by surface impedance of the present invention;

[0024] Figure 4 This is a schematic structural diagram of a 45° inclined slot unit Unit1 of the present invention;

[0025] Figure 5 45° inclined slot unit Unit1 with different slot depths and dispersion curves of light waves of the present invention;

[0026] Figure 6 4 is a curve diagram showing the relationship between the groove depth and the imaginary part of the surface impedance of the 45° inclined groove unit Unit1 of the present invention;

[0027] FIG. 7( a ) is a modulation factor (M1:M2) at 9.8 GHz of the present invention. 2 Take a 1:3 three-dimensional radiation pattern;

[0028] FIG. 7( b ) is a modulation factor (M1:M2) at 9.8 GHz of the present invention. 2 Take a 2:3 three-dimensional radiation pattern;

[0029] FIG. 7( c ) is a modulation factor (M1:M2) at 9.8 GHz of the present invention. 2 Take a 1:1 three-dimensional radiation pattern;

[0030] FIG. 7( d ) is a modulation factor (M1:M2) at 9.8 GHz of the present invention. 2 The two-dimensional radiation patterns in the xoz plane when the ratios are 1:3, 2:3 and 1:1 respectively;

[0031] FIG8(a) is a modulation factor (M1:M2) of the present invention. 2 Schematic diagram of SSPP waveguide at 1:3, 2:3 and 1:1 respectively;

[0032] FIG8(b) is a graph showing the reflection coefficient S11 of the present invention at the modulation factor (M1:M2) 2 Schematic diagram of the ratios of 1:3, 2:3 and 1:1 being all lower than -10dB;

[0033] FIG8(c) is a graph showing the transmission coefficient S21 of the present invention at the modulation factor (M1:M2) 2 Schematic diagram of the ratios of 1:3, 2:3 and 1:1 being all lower than -6dB;

[0034] FIG9(a) is a graph of the present invention at 9.8 GHz. and When on the xoz plane E x and E y Simulated near-field distribution at 9.8 GHz;

[0035] FIG9(b) is a graph of the present invention at 9.8 GHz. and The far-field radiation pattern simulated on the xoz plane when

[0036] FIG9(c) is a graph of the present invention at 9.8 GHz. and When xoz plane E x and E y Near field distribution diagram at 9.8GHz;

[0037] FIG9(d) is a graph of the present invention at 9.8 GHz. and The far-field radiation pattern simulated on the xoz plane when

[0038] FIG9(e) is a graph of the present invention at 9.8 GHz. and When xoz plane E x and E y Near field distribution diagram at 9.8GHz;

[0039] FIG9(f) is a graph of the present invention at 9.8 GHz. and The far-field radiation pattern simulated on the xoz plane when

[0040] FIG9(g) is a graph of the present invention at 9.8 GHz. and When xoz plane E x and E y Near field distribution diagram at 9.8GHz;

[0041] FIG9(h) is a graph of the present invention at 9.8 GHz. and The far-field radiation pattern simulated on the xoz plane when

[0042] Figure 10(a) shows different phase differences at 9.8 GHz and Schematic diagram of the SSPP waveguide;

[0043] Figure 10(b) is the time at 9.8 GHz. and Schematic diagram of simulation and test results of S parameters when ;

[0044] Figure 10(c) is the time at 9.8 GHz. and Schematic diagram of simulation and test results of S parameters when ;

[0045] Figure 10(d) is the time at 9.8 GHz. and Schematic diagram of simulation and test results of S parameters and circular polarization axis ratio;

[0046] Figure 10(e) is the time at 9.8 GHz. and Schematic diagram of simulation and test results of S parameters and circular polarization axis ratio.

[0047] Explanation of the marks in the figure: 1. Coplanar waveguide matching structure; 2. Artificial surface plasmon structure; 11. Gradient oblique slot transition structure; 12. Gradient slot line structure; 13. Arc structure; 21. Artificial surface plasmon unit structure. DETAILED DESCRIPTION

[0048] In order to better understand the purpose, structure and function of the present invention, the independent control device and method of dual-beam radiation based on SSPP waveguide of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0049] like Figure 1 As shown, an independent control device for dual-beam radiation based on SSPP waveguide includes a dielectric substrate, a metal strip located on the upper surface of the dielectric substrate and a metal floor covering the lower surface of the dielectric substrate; the material of the dielectric substrate is F4BM225, the thickness t1=2mm, and the total length of the waveguide is 396mm.

[0050] like Figure 2 As shown, the metal strip includes a coplanar waveguide matching structure 1 at both ends and an artificial surface plasmon structure 2 in the middle; the coplanar waveguide structure includes a plurality of gradually inclined slotted transition structures 11 symmetrically along the central axis, a gradually inclined slot line structure 12 and an arc structure 13 symmetrically arranged along the central axis, which are used to realize the matching feeding from the equivalent slot line structure to the artificial surface plasmon structure 2; the artificial surface plasmon structure 2 includes two upper and lower sidebands, each of which is composed of an artificial surface plasmon unit structure 21 arranged according to a composite periodic modulation arrangement, so as to realize directional dual-beam leaky wave radiation; the artificial surface plasmon unit structure 21 is a 45° inclined slotted unit, and the slotted unit structure forms an angle of 90° between the upper and lower sidebands of the metal strip, and the radiated electric fields are perpendicular to each other. The cross-sectional shape of the groove of the slotted unit of the artificial surface plasmon unit structure 21 along its own axis direction is rectangular, V-shaped or trapezoidal.

[0051] Figure 3As shown in , the proposed artificial surface plasmon structure 2 is composed of an arrangement of 45° oblique slotted artificial surface plasmon unit structures 21 perpendicular to each other on the upper and lower sides, and each sideband is designed independently. The surface impedance of the artificial surface plasmon unit structure 21 is modulated by designing the slot depth. After the artificial surface plasmon unit structure 21 is modulated by a composite period, dual-beam leakage wave radiation can be achieved. By adjusting the modulation factors M1 and M2 of the surface impedance, the radiation energy of each beam can be independently controlled. In addition, due to the design of the double-sided 45° oblique slot unit, the phase difference of the two orthogonal electric field components of each beam can be independently and flexibly designed, thereby satisfying one of the conditions for independent customization of the polarization state of each beam.

[0052] like Figure 4 As shown, an artificial surface plasmon unit structure 21 is denoted as Unit1, wherein the width of Unit1 is d, the slot width is a, the unit height is H, and the slot depth of the artificial surface plasmon unit structure varies from 0.1 mm to 2.9 mm. The periodic modulation of the surface impedance is achieved by gradually changing the slot depth.

[0053] When transmitting a signal, the energy is input into the waveguide through the SMA (small radio frequency coaxial connector) connectors welded at both ends, and after matching the coplanar waveguide structure, it is radiated out through the artificial surface plasmon structure 2 modulated according to the composite period, generating radiation beams in two directions in the upper half space of the SSPP waveguide.

[0054] In this embodiment, the radiation angles θ1 and θ2 of the two beams generated by the composite periodic surface impedance formula can be calculated by the following formula:

[0055]

[0056] Where X' = X s / η0 is the average surface impedance X s The coefficient obtained by normalizing the free space wave impedance η0 = 376.7ohm, is the wave number at the design frequency f0, c is the speed of light, P1 is the modulation period of the first radiation beam, and P2 is the modulation period of the second radiation beam. s After the value of is determined, the radiation angle of the first radiation beam is determined only by P1, and the radiation angle of the second radiation beam is determined only by P2.

[0057] The dual-beam composite periodic surface impedance generated by the artificial surface plasmon structure 2 can be calculated by the following formula:

[0058]

[0059] Where j is the imaginary unit, X sis the average surface impedance of the impedance surface modulated metal strip, M1 is the modulation factor of the first radiation beam, M2 is the modulation factor of the second radiation beam, both range from 0 to 0.23, P1 is the modulation period of the first radiation beam, P2 is the modulation period of the second radiation beam, is the initial phase of the first radiation beam generated by the ±y edges of the SSPP waveguide, is the initial phase of the second radiation beam generated by the ±y side of the SSPP waveguide, and the x direction is the propagation direction of the electromagnetic wave along the impedance surface. Using this formula to design the surface impedance can enable the SSPP waveguide to achieve dual-beam leaky wave radiation.

[0060] We choose the same X on both the +y and -y sides. s , M1, M2, P1 and P2 to design the surface impedance so that the two leakage waves generated on the upper and lower sides radiate to the same direction with the same energy amplitude. For the design of the radiation energy of the two beams, we design the relative values ​​of the tuning factors M1 and M2 to control the relative size of the radiation energy. For the design of the polarization state, since the 45° slots on both sides of the artificial surface plasmon structure are perpendicular to each other, the electric field components of the generated radiation beam are orthogonal, and the phase difference between the two orthogonal components is respectively given by and Since M1 and M2 of the upper and lower sidebands are the same, that is, energy radiation of two different directions with the same amplitude and orthogonal to each other is generated on both sides at the same time, only and To design the phase difference of the orthogonal electric field, the polarization state of the first radiation beam and the second radiation beam can be arbitrarily and independently designed. In summary, based on the proposed SSPP waveguide with double-sided 45° slanted slots, dual-beam leaky wave radiation can be achieved, and the modulation factors (M1, M2) and the initial phase difference can be designed respectively. To independently and flexibly control the radiation energy and polarization state of each radiation beam.

[0061] like Figure 5 The dispersion curves of units with different groove depths are shown. It can be seen that different groove depths correspond to different dispersion cutoff frequencies, and the deeper the groove, the lower the cutoff frequency.

[0062] like Figure 6 As shown, the groove depth h and surface impedance η surf The imaginary part of the relationship curve, the ordinate is the imaginary part of the surface impedance, the unit is the imaginary number Ω, Ω represents ohm. The abscissa is the groove depth h, the unit is mm, expressed in millimeters, and the other dimensions of the slotted unit structure are consistent with the data given above.

[0063] According to formulas (1) and (2), with 9.8 GHz as the center frequency, the radiation beams with radiation angles of θ1 = 40° and θ2 = -35° can be calculated. s =680ohm, modulation depth M max =M1+M2≈0.46, modulation period P1=21.6mm, P2=11.6mm. Figure 4 The range of surface impedance shown is 365 ohm to 995 ohm, which is selected to design the artificial surface plasmon structure.

[0064] Figure 7 shows that at 9.8 GHz, the modulation periods are selected as P1 = 21.6 mm, P2 = 11.6 mm, and the phase differences are selected as The simulated far-field radiation pattern of the dual-beam SSPP waveguide. According to formula (2), the upper and lower sideband structures of the artificial surface plasmon structure are symmetrical, generating two beams with angles of θ1 = 40° and θ2 = -35°, and the polarization modes are both horizontal linear polarization. At this time, we only design the modulation factors M1 and M2 to control the relative radiation energy of the two beams respectively. When M1 = M2 = 0.23, the artificial surface plasmon can be converted into two leakage waves with the same radiation energy, as shown in Figure 7(a). When M2 = 0.23 and M1 2 :M2 2 When the ratios of M1 to M2 are 2:3 and 1:3 respectively, the radiation energy of the first radiation beam can be controlled according to the change of M1, while the radiation energy of the second radiation beam remains unchanged due to the fixed M2. The three-dimensional far-field radiation diagrams are as follows: Figure 7(b) and 7(c) As shown. The above results can be more intuitively displayed on a linear scale, as shown in Figure 7(d), with the xoz plane taken as the observation plane. It can be seen that the radiation energy of the second radiation beam is basically maintained at G2=17.5 without change in the three cases, while the radiation energy of the first radiation beam reaches G1=17, 10.5 and 5.5 respectively. It is worth mentioning that by changing the modulation factor M2, the radiation energy of the second radiation beam can also be accurately controlled according to the same principle.

[0065] Figure 8(a) shows the fabricated SSPP waveguides with different modulation factors, Figure 8(b) shows the simulated S11 parameters, and Figure 8(c) shows the tested S21 parameters. Figure 8(b) shows that the reflection coefficient (S11) is lower than -10dB in all three cases, indicating that good matching and efficient radiation can be achieved near the design frequency of 9.8GHz. Figure 8(c) shows that the transmission coefficient (S21) is lower than -6dB in all three cases, and as M1 decreases, the transmission coefficient (S21) increases slightly, which is due to the decrease in the total energy of the radiated dual beams, further verifying the effect of the design.

[0066] Figure 9 shows the simulated near-field distribution and far-field radiation pattern of the dual-beam SSPP waveguide at 9.8 GHz when the modulation periods are selected as P1 = 21.6 mm and P2 = 11.6 mm, respectively, and the modulation factors are selected as M1 = M2 = 0.23. According to formula (2), the upper and lower sidebands of the artificial surface plasmon structure are and When the phase difference is 0 at different times, it is asymmetric, generating two beams with equal energy. At this time, we only design the phase difference and To control the polarization states of the two beams respectively. For the sake of simplicity, we chose so and

[0067] when and When , there is no phase difference between the orthogonal electric field components of beam 1 and beam 2, and both beams are horizontally polarized. Figure 9(a) shows the simulated near-field distribution on the xoz plane. The results show that the artificial surface plasmon is converted into a horizontally linearly polarized space wave (E x ), radiating to the directions of θ1 and θ2 respectively, without E y Figure 9(b) shows the simulated far-field radiation pattern, which further verifies that the two radiation beams are horizontal linear polarization waves with a cross-polarization level higher than 22dB. and When the first radiation beam is polarized, the phase difference of -180° is introduced into the phase of the two orthogonal electric fields, and the first radiation beam becomes a vertical linear polarization wave. The second radiation beam remains horizontally polarized. Figure 9(c) shows the near-field distribution of Ex and Ey at 9.8 GHz on the xoz plane, indicating that the near-field of the first radiation beam only has the Ey component, while the second radiation beam still only has the Ex component. Figure 9(d) also shows that the first radiation beam is a vertically polarized wave, and the second radiation beam is a horizontally polarized wave. and When the first radiation beam is horizontally linearly polarized, the orthogonal electric field of the second radiation beam becomes a circularly polarized wave due to the introduction of a 90° phase difference. Figure 9(e) shows the simulated near-field distribution on the y=xoz plane. The first radiation beam has only E x component, while the second radiation beam also has E x and E y The components have almost the same amplitude and a phase difference of 90°. Figure 9(f) shows the simulated far-field radiation pattern, which further verifies that the first radiation beam is a horizontal linear polarization wave and the second radiation beam is a left-hand circular polarization wave. and When the phase difference of -90° and 90° is introduced into the two orthogonal electric field components of the first radiation beam and the second radiation beam, the first radiation beam and the second radiation beam will be converted into circularly polarized waves. Figure 9(g) shows the simulated near-field distribution on the xoz plane, indicating that the E x and E y The amplitudes of the components are almost the same, but the E y Phase ratio E x The phase is delayed by 90°, and the E of the second radiation beam is y The phase is 90° ahead of Ex. Figure 9(h) shows the simulated far-field radiation pattern, indicating that the first radiation beam is a right-hand circularly polarized wave, while the second radiation beam is a left-hand circularly polarized wave.

[0068] Figure 10(a) shows the fabricated SSPP waveguides with different phase differences. Figure 10(b) , 10(c) , 10(d), and 10(e) respectively show the simulated and measured S parameters and axial ratios of circularly polarized waves under four polarization combinations. The results show that S11 and S21 are almost less than -10dB, indicating good radiation efficiency. The axial ratios of all circularly polarized waves are less than 2.5dB, indicating good circular polarization performance.

[0069] The present invention proposes an independent control device and method for dual-beam radiation based on SSPP waveguide, and designs the surface impedance of the artificial surface plasmon structure according to the composite periodic modulation to generate dual-wave leakage radiation. By designing the modulation factor and the phase difference between the upper and lower sidebands, the radiation energy and polarization mode of each beam can be independently designed. This is a simple and flexible design method for independently controlling the radiation energy and polarization state of dual beams on a single SSPP waveguide. The present invention is simple to manufacture, easy to operate, easy to integrate, and cost-saving, and has potential application prospects in the fields of satellite communications, multi-network and wireless network coverage.

[0070] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A control method for an independent control device of dual-beam radiation based on SSPP waveguide, characterized in that: The control device comprises a dielectric substrate, a metal strip located on the upper surface of the dielectric substrate and a metal floor covering the lower surface of the dielectric substrate, wherein the metal strip comprises a coplanar waveguide matching structure (1) at two ends and an artificial surface plasmon structure (2) in the middle; The coplanar waveguide matching structure (1) comprises a gradually inclined slot transition structure (11) symmetrically arranged along the central axis, a gradually inclined slot line structure (12) and an arc structure (13) symmetrically arranged along the central axis for realizing an equivalent slot line structure, and the gradually inclined slot transition structure (11) is connected to the artificial surface plasmon structure (2); The artificial surface plasmon structure (2) comprises two upper and lower sidebands, each sideband comprising an artificial surface plasmon unit structure (21) arranged in a composite periodic modulation; The artificial surface plasmon unit structure (21) is a 45° oblique slot unit, and the slot unit structure between the upper and lower side bands of the metal strip forms an angle of 90° and is perpendicular to each other; The surface impedance of the artificial surface plasmon structure (2) satisfies the following formula: Where j is the imaginary unit, X s is the average surface impedance of the impedance surface modulated metal strip, M1 is the modulation factor of the first radiation beam, M2 is the modulation factor of the second radiation beam, both range from 0 to 0.23, P1 is the modulation period of the first radiation beam, P2 is the modulation period of the second radiation beam, ±y1 is the initial phase of the first radiation beam generated by the ±y edges of the SSPP waveguide, is the initial phase of the second radiation beam generated by the ±y side of the SSPP waveguide, and the x direction is the propagation direction of the electromagnetic wave along the impedance surface; using this formula to design the surface impedance can enable the SSPP waveguide to achieve dual-beam leaky wave radiation; The control method comprises the following steps: taking different values ​​of M1 and M2, the relative values ​​of the radiation energies of the first radiation beam and the second radiation beam can be arbitrarily designed, and the ratio of the radiation energies of the first radiation beam and the second radiation beam is equal to M1 2 :M2 2 ; Take different phase differences between upper and lower sidebands and The value of can correspond to any design of the polarization mode of the first radiation beam and the second radiation beam. When is horizontal linear polarization, When is circular polarization, When is vertical linear polarization; When two different modulation factors M1 and M2 are used and the phase difference When the SSPP waveguide has two identical surface plasmon structures (2) on both sides, the SSPP waveguide has the same symmetry, and generates dual-beam leaky wave radiation with different radiation energies but the same polarization mode. When two identical modulation factors M1 and M2 are used and the phase difference is When they are not zero at the same time, the structures of the artificial surface plasmons on both sides of the SSPP waveguide are asymmetric, generating dual-beam leaky wave radiation with the same radiation energy but different polarization modes.

2. The control method of the independent control device of dual-beam radiation based on SSPP waveguide according to claim 1, characterized in that: The unit width and slot width of the artificial surface plasmon unit structure (21) are the same, and the slot depth varies in the range of 0.453 mm to 2.710 mm.

3. The control method of the independent control device of dual-beam radiation based on SSPP waveguide according to claim 1, characterized in that: The cross-sectional shape of the groove of the artificial surface plasmon unit structure (21) along its own axis direction is rectangular, V-shaped or trapezoidal.

4. The control method of the independent control device of dual-beam radiation based on SSPP waveguide according to claim 1, characterized in that: The material of the dielectric substrate is F4BM225.

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