Transparent orbital angular momentum antenna based on artificial surface plasmon

Abstract

The invention discloses a transparent orbital angular momentum antenna based on artificial surface plasmon. The transparent orbital angular momentum antenna comprises a linear SSPPs transmission line, an index-shaped transition coplanar waveguide, an Archimedes linear radiation patch and an ITO reflecting surface, the index-shaped transition coplanar waveguide is integrated at the feed end of the linear SSPP transmission line, the linear SSPP transmission line comprises a linear structure transmission line and an annular structure transmission line, the linear structure transmission line is connected with the annular structure transmission line, the Archimedes linear radiation patch is arranged on the inner side of the annular structure transmission line, and the Archimedes linear radiation patch is arranged on the outer side of the annular structure transmission line. A metal wire of the linear SSPPs transmission line is etched on the PET substrate through a photoetching process, and the ITO reflecting surface is fixed on the PET substrate. The transparent OAM antenna provided by the invention has a good optical transparency effect and a low profile, can solve the problems of huge equipment size and heavy structure, solves the problem that the OAM mode cannot be reconstructed, and improves the beam generation efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of antenna engineering technology, and in particular to a transparent orbital angular momentum antenna based on artificial surface plasmons. Background Art

[0002] In the development of 6G, orbital angular momentum (OAM) has attracted widespread attention as a revolutionary technology. OAM electromagnetic waves carry a unique spatial structure, with vortex-like phase distributions and circular amplitude distributions that differ significantly from traditional plane waves. Phase singularities exist at the center of these beams, forming complex spatial distributions such as Laguerre-Gaussian beams and high-order Bessel beams. OAM electromagnetic waves possess the property of mutual orthogonality between infinite integer modes, introducing new degrees of freedom beyond polarization, time, and frequency domains to broaden channels. In recent years, with the increasing demand for aesthetically pleasing overall design of RF devices, transparent antennas have emerged as a new type of wireless communication component. These antennas are characterized by being lightweight, transparent, and flexible, and are primarily made of conductive materials such as transparent conductive oxides or metal meshes. These antennas can be effectively integrated with a variety of transparent media, such as window glass and smartphone screens, enabling the embedding of antenna functionality without sacrificing the device's appearance or visual appeal, thus opening up broader application prospects for wireless communication devices.

[0003] Traditional OAM beamforming methods include spiral phase plates / antennas, uniform loop antenna arrays, and electromagnetic metasurfaces. While spiral phase plates can generate OAM beams, they are generally limited by their bulky and heavy structure. On the other hand, while compact structural designs such as uniform loop antenna arrays and periodically phased electromagnetic metasurfaces can reduce the physical size of OAM generation systems, these methods generally lack the ability to reshape the pattern, limiting their flexibility and versatility in practical applications. Commonly used materials for transparent antenna fabrication include indium tin oxide (ITO), AgHT, and metal mesh film (MMF). Transparent antennas designed with ITO and AgHT have high square resistance, resulting in low radiation efficiency, making them suitable only for small patch antenna designs. Antennas designed with MMF, while able to overcome the issue of low conductivity, suffer from low transparency, resulting in poor visual quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a transparent orbital angular momentum antenna based on artificial surface plasmons to solve the problems of low transparency and radiation efficiency in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A transparent orbital angular momentum antenna based on artificial surface plasmons, comprising a linear SSPPs transmission line, an exponentially shaped transition coplanar waveguide, an Archimedean linear radiation patch, and an ITO reflective surface; The exponentially shaped transition coplanar waveguide is integrated into the feeding end of the linear SSPP transmission line. The linear SSPPs transmission line includes a straight structure transmission line and a ring structure transmission line. The straight structure transmission line and the ring structure transmission line are connected. The Archimedean linear radiation patch is arranged on the inner side of the ring structure transmission line. The metal wire of the linear SSPPs transmission line is etched on a PET substrate through a photolithography process, and the ITO reflective surface is fixed on the PET substrate.

[0006] Furthermore, the straight structure transmission line has a gradient geometric structure, and the line width between the feeding end and the ring structure transmission line changes from thin to thick.

[0007] Furthermore, the metal wires are deposited on the surface of the PET substrate through a physical vapor deposition process, and the metal wires are formed into SSPP units through photolithography, development and etching processes.

[0008] Furthermore, a PMMA hard plate is fixedly attached to one side of the PET substrate by UV curing adhesive.

[0009] Furthermore, the ring-shaped transmission line is formed by periodically arranged "concave"-shaped SSPP units.

[0010] Furthermore, an opening is formed at one end of the exponential-shaped transition coplanar waveguide, and the inner conductor of the SMA connector is welded to the opening through conductive silver glue, and the opening is connected to the linear structure transmission line through the SMA connector.

[0011] Furthermore, the edge of the ground line of the exponentially shaped transition coplanar waveguide is provided with a sawtooth structure.

[0012] Furthermore, the Archimedean linear radiation patch includes a plurality of Archimedean spiral units arranged in a clockwise spiral arrangement, and the Archimedean spiral units are connected to the ring structure transmission line via a wide microstrip line.

[0013] Furthermore, the ITO reflective surface is made of aluminum tin oxide conductive glass with a square resistance of 0.5 Ω / sq, and the size of the ITO reflective surface is consistent with the size of the PET substrate.

[0014] Furthermore, cylindrical pillars are fixed to the four corners of the PET substrate, and the pillars are engaged with the ITO reflective surface through slots.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a transparent orbital angular momentum antenna based on artificial surface plasmons. By introducing artificial surface plasmons, a linear SSPPs transmission line is designed. An exponentially shaped transition coplanar waveguide is integrated into the feed end of the linear SSPP transmission line. This transmission line not only inherits the high field localization and dispersion control capabilities of the traditional SSPPs structure, but also achieves high light transmittance. Based on this, and in accordance with the radiation principle of the SSPPs leaky-wave antenna, an Archimedean spiral-shaped radiating patch with a low axial ratio and high duty cycle is further designed. This patch is positioned inside the ring-shaped transmission line. Combined with the linear SSPPs transmission line, it can radiate a bidirectional OAM beam with dual circular polarization and dual mode numbers. A transparent ITO conductive glass substrate is then used as a reflective surface and fixed to the PET substrate of the linear SSPPs transmission line. This enhances the gain of the radiated beam, solving the problem of low bidirectional OAM beam gain. In the transparent OAM antenna designed by the present invention, the compact structure of the artificial surface plasmons can solve the problems of bulky and heavy equipment, enabling the realization of a smaller OAM device on a subwavelength scale. Its reconfigurability solves the problem of non-reconfigurable OAM modes. By dynamically generating different OAM modes by changing frequency parameters, it increases system flexibility. Its low-loss characteristics reduce transmission loss and improve beamforming efficiency. Performance measurements of the proposed antenna show good correlation with simulation results. The antenna not only exhibits excellent optical transparency and a low profile, but can also be integrated into devices such as automotive glass and VR equipment. This provides new insights into the design of various subsequent transparent SSPPs devices and expands the application of SSPPs antennas in the field of optical transparency.

[0016] The transparent OAM antenna based on artificial surface plasmons provided by the present invention has the following significant advantages over traditional OAM antennas: 1. High optical transparency and low profile: By using a linear SSPPs transmission line structure with ultra-fine metal wires etched on an ultra-thin PET substrate, combined with a high-duty-cycle Archimedean spiral radiation patch, the average intensity of the transmitted light of the antenna in the visible light band (380-780 nm) is measured using a spectrophotometer. I ,pass T =( I / I0) × 100% calculated transmittance, achieving a light transmittance of 78%, a significant improvement over the opaque characteristics of traditional metal patch antennas. Furthermore, the ultra-thin PET substrate gives the antenna an extremely low profile, making it suitable for integrated scenarios such as automotive glass and VR devices that are sensitive to transparency and space constraints. 2. Dual-mode radiation and mode purity optimization: Through the collaborative design of a linear SSPPs transmission line and an Archimedean spiral radiating patch, bidirectional OAM beam radiation with dual circular polarization (left / right) and dual modes is achieved, with a maximum mode purity of 81%. Traditional OAM antennas are often limited to single polarization or insufficient mode purity, typically below 75%. However, this design effectively suppresses mode interference through a spiral structure with a low axial ratio (approximately 3dB). 3. Gain Enhancement and Unidirectional Radiation Control: By incorporating transparent ITO conductive glass as a reflector, theoretical derivation and experimental verification demonstrate polarization conversion of the reflected circularly polarized wave, integrating bidirectional radiation into a single circularly polarized, unidirectional OAM beam. This results in an average gain improvement of 2.1 dB. Conventional bidirectional OAM antennas typically suffer from low gain due to energy dispersion. Furthermore, the ITO reflector maintains the overall high system transmittance (78%), with only a slight decrease in mode purity to 79%, significantly improving upon the sudden drop in transmittance and mode distortion associated with conventional metal reflectors. 4. Process Compatibility and Application Scalability: The linear SSPPs transmission line structure is fabricated using physical vapor deposition and photolithography, achieving micron-level metal line width accuracy and scalable production. Compared to conventional non-transparent OAM antennas that rely on rigid substrates such as FR-4, this invention can be flexibly integrated onto transparent curved surfaces, such as automotive windshields, providing a novel electromagnetic-optical conformal device solution for intelligent cockpits and AR / VR optical convergence systems. 5. Transparent device breakthrough: Under the paradigm of traditional OAM antennas pursuing electromagnetic performance, this invention achieves the synergy of high transmittance (>75%), high mode purity (>79%) and gain optimization (+2.1dB) for the first time, breaking through the technical barriers of the incompatibility between transparent devices and high-performance antennas, providing theoretical support and prototype verification for the next generation of intelligent transparent electronic systems.

[0017] Furthermore, a linear SSPPs transmission line structure was designed using millimeter-scale thin metal wires. This structure uses physical vapor deposition technology to deposit the metal wires on a polyethylene terephthalate substrate, which can maintain high radiation electromagnetic properties while achieving high transparency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the overall architecture of the transparent orbital angular momentum antenna based on artificial surface plasmons of the present invention.

[0020] Figure 2 This is a physical picture and side view of the non-added ITO substrate of the present invention.

[0021] Figure 3 The figure and side view of the added ITO substrate of the present invention are shown.

[0022] Figure 4 Schematic diagram of return loss parameters of the present invention.

[0023] Figure 5 Schematic diagram of the near-field mode of the present invention.

[0024] Figure 6 Schematic diagram of the radiation pattern of the present invention.

[0025] Figure 7 Schematic diagram of gain and radiation efficiency of the present invention. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0029] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The present invention is described in further detail below with reference to the accompanying drawings: See also Figure 1 The present invention provides a transparent orbital angular momentum antenna based on artificial surface plasmons (SSPPs). The antenna comprises a linear SSPP (artificial surface plasmon polaritons) transmission line, an exponentially shaped transition coplanar waveguide, an Archimedean linear radiating patch, and an ITO reflective surface. The exponentially shaped transition coplanar waveguide is integrated into the feed end of the linear SSPP transmission line.

[0033] The linear SSPPs transmission line utilizes metal wires deposited onto a polyethylene terephthalate (PET) substrate using physical vapor deposition (PVD). SSPP units are then formed on the PET substrate through photolithography, development, and etching. The linear SSPPs transmission line is coupled using a dual structure: a straight line and a ring structure. The straight line features a gradient geometry, with the line width between the feed end and the ring structure transitioning from thin to thick to achieve a smooth impedance transition. The ring structure is constructed from a periodic arrangement of concave SSPP units. A polymethyl methacrylate (PMMA) rigid board is bonded to the underside of the PET substrate using UV-curable adhesive to solidify the antenna, enhancing mechanical stability and suppressing deformation.

[0034] The exponentially shaped transition coplanar waveguide closely adheres to the linear SSPPs transmission line, creating a surface impedance with it. An opening is provided at the end, which connects to the SMA connector's inner conductor via conductive silver glue. The opening then connects to the linear transmission line through the SMA connector, ensuring efficient RF signal transmission. Furthermore, the ground line of the exponentially shaped transition coplanar waveguide features a serrated edge for impedance matching.

[0035] The Archimedean line radiating patch is located inside a ring-shaped transmission line and consists of several Archimedean spiral units arranged in a clockwise pattern. These units are connected to the ring-shaped transmission line via a wide microstrip line, enabling leakage conversion of surface waves into free-space waves.

[0036] The ITO reflective surface is made of aluminum tin oxide conductive glass with a square resistance of 0.5 Ω / sq. The dimensions of the ITO reflective surface match those of the PET substrate. Cylindrical pillars, made of ABS material and evenly fixed to the four corners of the PET substrate via 3D printing, are fixed to the four corners of the PET substrate. The ITO reflective surface and the pillars are fixed to the PET substrate via slots, improving overall light transmittance.

[0037] The present invention is described in further detail below through specific embodiments: Example 1: The multi-mode reconfigurable artificial surface plasmon transparent orbital angular momentum antenna provided in this embodiment firstly gives the overall radiation pattern of the antenna as follows:

[0038] On this basis, the antenna is processed and prepared into the structure designed by the present invention using simulation software and PVD technology to obtain the final antenna. The antenna specifically includes the following components: 1. Linear SSPPs transmission line The linear SSPPs transmission line is made of a 1.2 μm thick copper film etched on a 125 μm thick polyethylene terephthalate (PET) transparent substrate using a photolithography process. The linear SSPPs transmission line adopts a linear and circular dual structure coupling design: The straight-line transmission line has a gradient geometry, with the line width gradually increasing from 0.15 mm at the feeding end to 0.3 mm at the connecting end of the ring-shaped transmission line, to achieve a smooth transition to a 50 Ω characteristic impedance.

[0039] The ring structure transmission line is a closed circular ring with a radius of 71.2 mm. It is composed of periodically arranged "concave" SSPP units with a unit period of 5 mm, a groove depth of 1.25 mm, and a line width of 0.15 mm.

[0040] Substrate reinforcement: A 1.5 mm thick polymethyl methacrylate (PMMA) hard plate is attached to the bottom of the PET substrate and fixed with UV curing adhesive, such as Figure 2 As shown, mechanical stability and deformation suppression.

[0041] 2. Exponentially shaped transitional coplanar waveguide The exponentially shaped transitional coplanar waveguide is integrated into the feed end of the linear SSPP transmission line. Specific features include: Geometric design: An exponential taper curve is used to connect a standard 50 Ω SMA connector to the SSPP transmission line. The taper length is 30 mm, the ground line width is 2.3 mm, the center conductor width is 0.5 mm, and the gap is 0.2 mm.

[0042] Impedance matching: HFSS was used to optimize the sawtooth structure of the ground wire edge, with a sawtooth depth of 0.1 mm and a period of 0.5 mm, to achieve a return loss of S in the 5-8 GHz frequency band. 11 <-15 dB, e.g. Figure 4 shown.

[0043] Interface design: A 2.5 mm × 2.5 mm rectangular opening is opened at the end, and the SMA inner conductor is welded with conductive silver glue to ensure efficient transmission of RF signals.

[0044] 3. Archimedean linear radiation patch The Archimedean linear radiation patch consists of 14 Archimedean spiral units arranged in a clockwise spiral. The specific parameters are as follows: Layout: Six SSPP units (30 mm apart) are evenly distributed along the inner side of the ring structure transmission line. The Archimedean spiral has a starting radius of 3 mm, an ending radius of 6.2 mm, and a pitch of 0.39 mm / rad.

[0045] Electromagnetic coupling: Each Archimedean spiral unit is connected to a ring-structured transmission line via a 0.2 mm wide microstrip line with a coupling length of 2 mm to achieve leakage conversion from surface waves to free-space waves.

[0046] Mode control: By adjusting the feeding frequency (6~7.5 GHz), different orders of OAM modes (l=-2~4) are excited, with the highest mode purity reaching 81%.

[0047] 4. ITO reflective surface The ITO reflector is made of aluminum tin oxide (ITO) conductive glass with a square resistance of 0.5 Ω / sq. Its dimensions are the same as the PET substrate, 150 mm × 150 mm. It is integrated in the following way: Support structure: Four cylindrical pillars with a height of 22 mm and a diameter of 5 mm are 3D printed using ABS material. They are evenly fixed at the four corners of the PET substrate and embedded in the ITO reflective surface through slots.

[0048] Functional optimization: The distance between the ITO reflective surface and the PET substrate is 1 / 4 wavelength (11.5 mm) of the 6.5 GHz center frequency, which increases the bidirectional radiation gain from 5.7 dBi to 7.8 dBi, and the axial ratio is <3 dB.

[0049] The metallization of the present invention uses physical vapor deposition (PVD) to deposit a copper film on the surface of the PET substrate, and then forms the pattern of the SSPP unit and the Archimedean line radiation patch through photolithography, development, and etching. Then, the PET substrate, PMMA backplane and ITO reflective surface are stacked in sequence and assembled by bonding with UV curing adhesive. Figure 3 As shown, the overall light transmittance is 78%.

[0050] For the multi-mode reconfigurable artificial surface plasmon transparent orbital angular momentum antenna prepared in Example 1, the actual parameter performance of the antenna was tested through far-field and near-field experiments in a microwave darkroom to verify whether its performance effects such as mode purity met the design expectations.

[0051] The near-field experiment involves connecting the probe and the antenna under test to the two ports of a vector network analyzer via a coaxial cable, with the probe and the antenna placed 250 mm apart. The probe can be moved horizontally and vertically using two-dimensional control to record electric field data. During the measurement, the electric field distribution in the x-polarization direction is first scanned. The probe is then rotated 90° to record the electric field distribution in the y-polarization direction and plot the near-field electric field image.

[0052] Take a point on the circle of radius R corresponding to the average maximum value of the electric field amplitude, process the near-field electric field phase, and use discrete Fourier transform (DFT) to convert the phase point discrete signal x [ n ]Convert to frequency domain representation X [ k ].

[0053]

[0054] After calculation, the legends displayed in order are the near-field electric field images with mode numbers ranging from 2 to -1, such as Figure 5 The relationship between mode purity and frequency is shown in Table 1.

[0055] Table 1 Mode purity and gain at different frequencies

[0056] The far-field experiment steps are as follows: place the antenna under test in the test chamber, ensure that the distance between the antenna and the test system is greater than 5 times the antenna aperture (i.e., the far-field distance), adjust the antenna and receiving probe to the appropriate position, transmit a standard signal, collect the far-field signal radiated by the antenna through the receiving probe, use the test software to analyze the signal, calculate the antenna's radiation characteristic parameters (such as gain, directivity, polarization characteristics, etc.), and finally evaluate the antenna performance based on the test results and draw a radiation pattern image, such as Figure 6 As shown in FIG, as the absolute value of the mode number increases, the beam opening satisfies the trend of gradually increasing from 0.

[0057] like Figure 7 As shown in the figure, the measured results of gain and radiation efficiency of the present invention show that the antenna supports 7 OAM modes in the 6~7.5 GHz frequency band, with a radiation efficiency of >70% and a transmittance of 78%, making it suitable for vehicle-mounted glass integrated communications and transparent electronic device scenarios.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A transparent orbital angular momentum antenna based on artificial surface plasmon, characterized in that: Including linear SSPPs transmission lines, exponentially shaped transition coplanar waveguides, Archimedean linear radiation patches and ITO reflective surfaces; The exponentially shaped transition coplanar waveguide is integrated into the feeding end of the linear SSPP transmission line. The linear SSPPs transmission line includes a straight structure transmission line and a ring structure transmission line. The straight structure transmission line and the ring structure transmission line are connected. The Archimedean linear radiation patch is arranged on the inner side of the ring structure transmission line. The metal wire of the linear SSPPs transmission line is etched on a PET substrate through a photolithography process, and the ITO reflective surface is fixed on the PET substrate.

2. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: The straight structure transmission line has a gradient geometric structure, and the line width between the feeding end and the ring structure transmission line is from thin to thick.

3. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: The metal wires are deposited on the surface of the PET substrate through a physical vapor deposition process, and the metal wires are formed into SSPP units through photolithography, development and etching processes.

4. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: A PMMA hard plate is fixedly attached to one side of the PET substrate by UV curing adhesive.

5. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: The ring structure transmission line is composed of periodically arranged "concave" shaped SSPP units.

6. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: An opening is formed at one end of the exponential-shaped transition coplanar waveguide, and the opening is welded to the inner conductor of the SMA connector through conductive silver glue, and the opening is connected to the linear structure transmission line through the SMA connector.

7. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: The edge of the ground line of the exponential-shaped transition coplanar waveguide is provided with a sawtooth structure.

8. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: The Archimedean linear radiation patch comprises a plurality of Archimedean spiral units arranged in a clockwise spiral arrangement, and the Archimedean spiral units are connected to a ring-shaped transmission line via a wide microstrip line.

9. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: The ITO reflective surface is made of aluminum tin oxide conductive glass with a square resistance of 0.5 Ω / sq, and the size of the ITO reflective surface is consistent with that of the PET substrate.

10. The transparent orbital angular momentum antenna based on artificial surface plasmon according to claim 1, characterized in that: The four corners of the PET substrate are fixed with cylindrical pillars, and the pillars are engaged with the ITO reflective surface through slots.

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