CN116435762B - Leaky-wave antenna based on three-dimensional all-metal SSPP structure - Google Patents
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- 239000002184 metal Substances 0.000 title claims abstract description 125
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 125
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- 239000000654 additive Substances 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/22—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation in accordance with variation of frequency of radiated wave
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a leaky-wave antenna based on a three-dimensional all-metal SSPP structure, which comprises waveguide ports, transition structures and radiation structures, wherein two ends of each radiation structure are respectively connected with two transition structures, and one end of each transition structure is connected with a corresponding waveguide port; the radiation structure comprises a metal floor and a plurality of metal plates, wherein the metal plates are modulated in a sine cycle and are arranged on the same side of the metal floor. The invention adopts sine period modulation to realize the conversion of electromagnetic slow waves into fast waves through the radiation structure, and directly generates radiation, so that the efficiency and radiation characteristics of the antenna are improved. The total efficiency of the leaky-wave antenna based on the three-dimensional all-metal SSPP structure in the working frequency band is higher than 75%, and the radiation efficiency is higher than 90%; the technical problems of low radiation efficiency, low power capacity, small beam scanning angle and the like of the conventional leaky-wave antenna with the two-dimensional SSPP structure are solved.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a leaky-wave antenna based on a three-dimensional all-metal SSPP structure.
Background
With the development of antenna technology, antenna scanning technology plays an increasingly important role. A frequency scanning antenna is a type of antenna whose maximum beam has different angular orientations as the operating frequency changes.
Surface plasmons (Surface Plasmon Polariton, SPP) are a mixed excited state formed by the interaction of free electrons and photons propagating along a metal-medium interface, exhibit highly confined surface wave modes in a medium outside the metal, and have near field enhancement, surface confinement, short wavelength, and other characteristics. SPP involves two motions: the electric charge movement of the metal surface and the electromagnetic wave (polariton) in air or dielectric medium act together to form the SPP with unique properties. The electromagnetic waves in which SPPs coexist can be only TM waves. The energy of the SPP wave decreases exponentially in the direction perpendicular to the interface, and substantially one wavelength distance is lost, whereby the energy of the SPP wave is better confined at the interface.
Artificial surface plasmons (Spoof Surface Plasmon Polariton, SSPP) are the dynamic expansion of the SPP concept at low frequency bands. The artificial surface plasmon polariton (SSPP) has the characteristics of local field enhancement and strong dispersion, and has important application value in the design of microwave devices and antennas. The traditional two-dimensional SSPP frequency scanning antenna is mainly designed based on a microstrip structure of a printed circuit board, and the defects of low radiation efficiency, low power capacity, small beam scanning angle and the like limit the development of the traditional SSPP frequency scanning antenna.
Disclosure of Invention
The invention aims to solve the technical problems of low radiation efficiency, low power capacity, small beam scanning angle and the like of the conventional leaky-wave antenna with the two-dimensional SSPP structure, and provides a leaky-wave antenna based on a three-dimensional all-metal artificial surface plasmon (Spoof Surface Plasmon Polariton, abbreviated as SSPP) structure.
In order to achieve the above object, the technical scheme of the present invention is as follows.
The leaky-wave antenna based on the three-dimensional all-metal SSPP structure comprises waveguide ports, transition structures and radiation structures, wherein two ends of each radiation structure are respectively connected with two transition structures, and one end of each transition structure is connected with a corresponding waveguide port;
the radiation structure comprises a metal floor and a plurality of metal plates, wherein the metal plates are modulated in a sine cycle and are arranged on the same side of the metal floor.
Further, the transition structure comprises a first transition section and a second transition section, the first transition section is arranged on the upper side of the second transition section, and one end of the second transition section is connected with the radiation structure.
Still further, an end of the first transition section flares gradually in a direction toward the radiating structure and away from the second transition section.
Still further, one end of the first transition section is smoothly transitioned in a linear variable configuration with a slope of 0.06.
Further, a plurality of the metal plates are arranged on one side of the second transition section; the height of the plurality of metal plates on the second transition section gradually increases in a direction toward the radiation structure.
Further, the waveguide port is used for inputting TE10 mode electromagnetic waves;
the transition structure is used for converting TE10 mode electromagnetic waves and TM mode electromagnetic waves, and enabling the characteristic impedance of the waveguide port to be matched with the characteristic impedance of the feed end of the radiation structure;
the radiating structure is used for responding to TM mode electromagnetic waves and radiating out a beam direction changing with frequency in the far field of the antenna.
Further, the radiation structure comprises a plurality of radiation units, one radiation unit comprises a plurality of SSPP units, one SSPP unit is composed of one metal plate and one metal floor, and one metal floor and a plurality of metal plates corresponding to one sine period form one radiation unit.
Still further, sinusoidal periodic modulation of the plurality of SSPP cells is modulation of metal plate heights within the plurality of SSPP cells;
and carrying out high sinusoidal modulation on the metal plates of different SSPP units in the radiation unit so as to convert the electromagnetic wave in the slow wave mode into the electromagnetic wave in the fast wave mode.
Further, the spacing between two adjacent SSPP units is equal.
Further, the metal plate height and period of each SSPP unit satisfy: a, a<p<2a、0.03<<0.1; wherein a is the distance between two metal plates, p is the periodic distance of the metal plates of the SSPP unit, lambda h Modulating the cut-off wavelength of the waveguide for the sinusoidal period corresponding to the SSPP unit; the height of the sine period modulation waveguide corresponding to the radiation unit is as follows:n is the number of the sine-period metal plates of one radiation unit, and i is the ith metal plate.
The invention provides a manufacturing process of a leaky-wave antenna based on a three-dimensional all-metal SSPP structure, which comprises the following steps: according to the design requirement of a leaky-wave antenna based on a three-dimensional all-metal SSPP structure, adopting a photocuring forming additive manufacturing process, and integrally forming to obtain an antenna matrix; and then carrying out surface metallization treatment on the antenna matrix by adopting an electroless copper plating method to obtain the leaky wave antenna based on the three-dimensional all-metal SSPP structure.
The invention provides a use process of a leaky-wave antenna based on a three-dimensional all-metal SSPP structure, which comprises the following steps: the input waveguide ports are respectively connected with external signal sources, so that the antenna far field can be provided with a directional pattern of beam pointing changing along with frequency.
The invention has the beneficial effects that:
1. the invention adopts sine period modulation to realize the conversion of electromagnetic slow waves into fast waves through the radiation structure, and directly generates radiation, so that the efficiency and radiation characteristics of the antenna are improved. The total efficiency of leaky-wave antennas based on three-dimensional all-metal SSPP structures in the operating band is higher than 75% and the radiation efficiency is higher than 90%.
2. According to the invention, the waveguide SSPP transition structure is adopted to realize impedance matching of the antenna, and the transition structure adopts a two-section gradual change structure to quickly realize mode conversion and impedance matching, so that the transmission efficiency of a main mode TM mode is improved.
3. According to the invention, the antenna matrix is obtained by processing through a photocuring molding additive manufacturing process, and the surface metallization treatment is carried out on the antenna matrix in an electroless copper plating mode, so that an all-metal structure is formed, and the antenna is ensured to have lower loss. The leaky-wave antenna is processed by adopting a 3D printing process, so that the processing precision is improved, the structure is simple, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a three-dimensional all-metal based SSPP leaky-wave antenna according to an embodiment;
FIG. 2 is a cross-sectional view of a three-dimensional all-metal based SSPP leaky wave antenna according to an embodiment;
FIG. 3 is a schematic diagram of a radiating element in an embodiment;
FIG. 4 is a graph of dispersion of an SSPP unit in an embodiment;
FIG. 5 is a graph of simulation results of scattering parameters based on a three-dimensional all-metal SSPP leaky-wave antenna in an embodiment;
FIG. 6 is a diagram of a three-dimensional all-metal based SSPP leaky-wave antenna fed by a left waveguide port in an embodiment;
FIG. 7 is a diagram of a three-dimensional all-metal based SSPP leaky-wave antenna fed by a right side waveguide port in an embodiment;
FIG. 8 is a graph of simulation results of gain versus frequency for a three-dimensional all-metal based SSPP leaky-wave antenna in an embodiment;
fig. 9 is a graph showing simulation results of efficiency of the three-dimensional all-metal-based SSPP leaky-wave antenna according to an embodiment as a function of frequency.
In the figure, 1, a waveguide port; 11. a waveguide flange; 2. a transition structure; 21. a first transition section; 22. a second transition section; 3. a radiating structure; 31. a radiation unit; 311. an SSPP unit; 3111. a metal plate; 3112. a metal floor.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The experimental methods in the following examples are all conventional methods unless otherwise specified; reagents and materials, unless otherwise specified, are commercially available.
Referring to fig. 1 to 2, a leaky-wave antenna based on a three-dimensional all-metal SSPP structure includes a waveguide port 1, a transition structure 2 and a radiation structure 3, wherein two ends of the radiation structure 3 are respectively connected with the two transition structures 2, and one end of each transition structure 2 is connected with its corresponding waveguide port 1.
The waveguide port 1 is used for inputting electromagnetic waves of TE10 mode. The waveguide port comprises an input port body and an input flange; the input flange is fixed on the outer side of the input port body and is used for being connected with a shell externally connected with a signal source; the input end of the input port body is connected with the source end interface of an external signal source, and the output end of the input port body is connected with the input end of the transition structure 2. For example, the input port body is a WR-137 standard waveguide port; the input flange is an FDP70 standard rectangular waveguide flange.
The transition structure 2 is used for realizing effective conversion between electromagnetic waves in a rectangular waveguide TE10 mode and electromagnetic waves in a TM mode based on an SSPP structure, and simultaneously, the characteristic impedance of the waveguide port 1 is matched with the characteristic impedance of the feed end of the radiation structure 3 through the transition structure 2.
The transition structure 2 comprises a first transition section 21 and a second transition section 22, the first transition section 21 being a waveguide first transition section and the second transition section 22 being an SSPP second transition section. One end of the first transition section 21 flares gradually in a direction towards the radiating structure 3 and away from the second transition section 22. For example, one end of the first transition section 21 is smoothly transitioned with a linear varying structure having a slope of 0.06. One end of the second transition section 22 is connected to the radiating structure 3. A plurality of metal plates 3111 are arranged on one side of the second transition section 22; the height of the plurality of metal plates 3111 on the second transition section 22 increases gradually in a direction toward the radiation structure 3. That is, the second transition section 22 gradually transitions from a small height to a large height through the metal plate 3111.
The radiating structure 3 is arranged to respond to the converted TM mode electromagnetic wave and radiate a beam-pointing pattern with frequency in the far field of the antenna. The radiation structure 3 includes a metal floor 3112 and a plurality of metal plates 3111, each of the plurality of metal plates 3111 being modulated with a sinusoidal period and arranged on the same side of the metal floor 3112. Specifically, the radiation structure 3 includes a plurality of radiation units 31, one radiation unit 31 includes a plurality of SSPP units 311, one SSPP unit 311 is composed of one metal plate 3111 and one metal floor 3112, and one SSPP unit corresponding to a sine cycle constitutes one radiation unit 31. Sinusoidal periodic modulation of the plurality of SSPP cells 311 is modulation of the metal plate heights within the plurality of SSPP cells; the radiation structure 3 directly generates radiation by converting electromagnetic waves in a slow wave mode into electromagnetic waves in a fast wave mode by highly periodically sinusoidal modulating the metal plates 3111 of the different SSPP units 311 within the radiation unit. The spacing between two adjacent SSPP units is equal.
The heights and periods of the metal plates of the SSPP units in each radiation unit are as follows: a, a<p<2a、0.03<<0.1; wherein a is the distance between two metal plates, p is the periodic distance of the metal plates of the SSPP unit, lambda h Modulating the cut-off wavelength of the waveguide for the sinusoidal period corresponding to the SSPP unit; the height of the sine period modulation waveguide corresponding to the radiation unit is as follows:n is the number of the sine-period metal plates of one radiation unit, and i is the ith metal plate.
The manufacturing process of the leaky-wave antenna based on the three-dimensional all-metal SSPP structure comprises the following steps:
according to the design requirement of a leaky-wave antenna based on a three-dimensional all-metal SSPP structure, adopting a photocuring forming additive manufacturing process, and integrally forming to obtain an antenna matrix; and then carrying out surface metallization treatment on the antenna matrix by adopting an electroless copper plating method to obtain the leaky wave antenna based on the three-dimensional all-metal SSPP structure.
The use process of the leaky-wave antenna based on the three-dimensional all-metal SSPP structure comprises the following steps: the input waveguide ports 1 are respectively connected with external signal sources, so that the antenna far field can be provided with a directional pattern of beam pointing changing along with frequency.
The structure of a leaky-wave antenna based on a three-dimensional all-metal SSPP structure is specifically described below.
Example 1
Referring to fig. 1 to 2, in this embodiment, a leaky-wave antenna based on a three-dimensional all-metal SSPP structure is provided, which includes: a waveguide port 1, a transition structure 2 and a radiating structure 3; the input end of the waveguide port 1 is used for being connected with an electromagnetic energy source, the output end of the waveguide port 1 is connected with the input end of the transition structure 2, and the output end of the transition structure 2 is connected with the feed end of the radiation structure 3.
In the present embodiment, the waveguide port 1 is used for inputting electromagnetic waves; the transition structure 2 is used for realizing the effective mode conversion between a rectangular waveguide TE10 mode and an antenna TM mode based on an SSPP structure, and simultaneously matching the impedance of an output port of the input waveguide port 1 with the impedance of a feed end of the radiation structure 3 through the transition structure 2; the radiating structure 3 is arranged to respond to the converted TM mode electromagnetic wave and radiate a beam-pointing pattern with frequency in the far field of the antenna.
As shown in fig. 1 to 3, the respective portions of the leaky-wave antenna based on the three-dimensional all-metal SSPP structure described above in the present embodiment will be described in more detail.
In the embodiment, a leaky-wave antenna based on a three-dimensional all-metal SSPP structure adopts WR-137 standard waveguide feed; the waveguide flange 11 adopts an FDP70 standard rectangular waveguide flange.
The transition structure 2 comprises a rectangular waveguide first transition section and an SSPP second transition section, wherein the rectangular waveguide first transition section adopts a linear change structure with the slope of 0.06 for smooth transition, and the SSPP second transition section is in gradual transition from small to large in sequence through the height of the metal plate.
The SSPP unit 311 is composed of a metal plate 3111 and a metal floor 3112, and the radiation unit 31 is composed of 13 SSPP units 311 modulated in a sinusoidal cycle, and is connected integrally with each other. Several radiating elements 31 constitute the radiating structure 3.
Specifically, in this embodiment, the periodic distance p of the metal plates of the SSPP unit is 3mm, and the distance a between the two metal plates is 2mm.
In this embodiment, the height h1 of the first SSPP cell metal plate of the radiating cell is 0.39mm; the height h2 of the second SSPP cell metal plate of the radiating cell is 1.50mm; the height h3 of the third SSPP unit metal plate of the radiation unit is 3.10mm; the height h4 of the fourth SSPP cell metal plate of the radiating cell is 4.88mm; the height h5 of the fifth SSPP cell metal plate of the radiating cell is 6.49mm; the height h6 of the sixth SSPP cell metal plate of the radiating cell is 7.60mm; the height h7 of the seventh SSPP unit metal plate of the radiation unit is 8.00mm; the height h6 of the eighth SSPP unit metal plate of the radiation unit is 7.60mm; the height h5 of the ninth SSPP cell metal plate of the radiating cell is 6.49mm; the height h4 of the tenth SSPP unit metal plate of the radiation unit is 4.88mm; the eleventh SSPP cell metal plate of the radiating cell has a height h3 of 3.10mm; the height h2 of the twelfth SSPP cell metal plate of the radiation cell is 1.50mm; the thirteenth SSPP cell metal plate of the radiation cell has a height h1 of 0.39mm.
The dimensions of the antenna radiating structure were 284mm x 10mm x 19.63mm.
FIG. 4 is an SSPP unit dispersion plot for a leaky wave antenna based on a three dimensional all metal SSPP structure. Due to the slow wave nature of SSPP, its k vector in the propagation direction is greater than k in free space 0 The SSPP has the characteristics of short wavelength, local field enhancement and strong dispersion, and the dispersion relation can be changed by modifying the geometric parameters. This implementation is accomplished by varying the heights of the SSPP structural elements, as can be seen in FIG. 4, by the simulated discrete relationship of the SSPP structure with different element heights, the wavenumber k along the propagation direction as the element height increases z The cut-off frequency decreases and gets farther away from the free wave in space. As the cell height increases from 0.39mm to 8.00mm, the intersection of the dispersion curve and the free wave in space decreases, and the dispersion curve decreasesThe cut-off frequency of the wire also decreases from 47.2GHz to 8.4GHz.
In this example, h=8.00 mm was selected to control the cut-off frequency around 8 GHz.
With the leaky-wave antenna based on the three-dimensional all-metal SSPP structure, in this embodiment, the SSPP unit needs to be introduced into sinusoidal periodic modulation, the field of the electromagnetic wave guided by the slow wave structure becomes a superposition of a series of spatial harmonics, and the slow wave is converted into a fast wave mode, even k z <k 0 Thereby performing irradiation. As shown in fig. 3, a=13×p is selected as the distance of one sine-period radiation unit in this embodiment.
The manufacturing process of the leaky-wave antenna based on the three-dimensional all-metal SSPP structure of the embodiment specifically comprises the following steps: according to the design requirement of the antenna, adopting a photocuring forming additive manufacturing process to obtain an antenna matrix; and (3) carrying out surface metallization treatment on the antenna matrix by adopting an electroless copper plating method to obtain the three-dimensional all-metal SSPP structure leaky-wave antenna.
In the embodiment, the antenna is processed by adopting a light curing molding technology (SLA) additive manufacturing technology, and surface metallization is realized through electroless copper plating after light curing molding, so that the antenna has the electromagnetic performance of an all-metal antenna; the antenna adopting the processing method has the advantages of light weight, reduced mechanical load of the system and significantly reduced processing cost compared with the traditional numerical control mechanical milling mode.
The performance of the leaky wave antenna based on the three-dimensional all-metal SSPP structure provided in the above example was tested in the following simulation, and the results are shown in fig. 5 to 9.
Fig. 5 is a diagram of S-parameter simulation results of leaky-wave antennas based on three-dimensional all-metal SSPP structures. As can be seen from fig. 5, the antenna has S11 lower than-10 dB in the operating band range of 6.6GHz-8.2GHz, and S21 lower than-10 dB in the entire operating band range, indicating that the antenna has stable and good radiation characteristics in the entire operating band.
Fig. 6 is a diagram of a leaky-wave antenna based on a three-dimensional all-metal SSPP structure fed by a left side waveguide port. As can be seen from fig. 6, the beam scanning range of the antenna in the entire operating band range is 86 ° to 43 °, and the antenna has a back-to-front scanning characteristic as can be seen from the main lobe direction angles of the respective bands.
Fig. 7 is a diagram of a leaky-wave antenna based on a three-dimensional all-metal SSPP structure fed by a right side waveguide port. As can be seen from fig. 7, the beam scanning range of the antenna in the entire operating band range is 94 ° to 133 °, and the antenna has a back-to-front scanning characteristic as can be seen from the main lobe direction angles of the respective bands.
Fig. 8 shows a simulation result graph of gain of a leaky wave antenna based on a three-dimensional all-metal SSPP structure according to frequency. As can be seen from fig. 8, the leaky wave antenna based on the three-dimensional all-metal SSPP structure has a maximum gain of 12.3dBi in the operating band, and the gain variation in the operating band is less than 2.8dBi.
Fig. 9 is a graph showing simulation results of the efficiency of a leaky wave antenna based on a three-dimensional all-metal SSPP structure as a function of frequency. As can be seen from fig. 8, the total efficiency of leaky wave antennas based on three-dimensional all-metal SSPP structures in the operating band is higher than 75% and the radiation efficiency is higher than 90%.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The leaky-wave antenna based on the three-dimensional all-metal SSPP structure is characterized by comprising waveguide ports, transition structures and radiation structures, wherein two ends of each radiation structure are respectively connected with two transition structures, and one end of each transition structure is connected with a corresponding waveguide port;
the radiation structure comprises a metal floor and a plurality of metal plates, wherein the metal plates are modulated in a sine cycle and are arranged on the same side of the metal floor;
the transition structure comprises a first transition section and a second transition section, the first transition section is arranged on the upper side of the second transition section, and one end of the second transition section is connected with the radiation structure;
one end of the first transition section is gradually opened along the direction towards the radiation structure and is far away from the second transition section;
the plurality of metal plates are arranged on one side of the second transition section; the height of the plurality of metal plates on the second transition section gradually increases in a direction toward the radiation structure.
2. The leaky wave antenna based on a three dimensional all metal SSPP structure according to claim 1, wherein an end of the first transition section is smoothly transited in a linearly varying structure having a slope of 0.06.
3. The leaky-wave antenna based on a three dimensional all metal SSPP structure according to claim 1, wherein said waveguide port is for inputting electromagnetic waves in TE10 mode;
the transition structure is used for converting TE10 mode electromagnetic waves and TM mode electromagnetic waves, and enabling the characteristic impedance of the waveguide port to be matched with the characteristic impedance of the feed end of the radiation structure;
the radiating structure is used for responding to TM mode electromagnetic waves and radiating out a beam direction changing with frequency in the far field of the antenna.
4. The leaky wave antenna based on a three dimensional all metal SSPP structure according to claim 1, wherein the radiating structure comprises a plurality of radiating elements, one radiating element comprises a plurality of SSPP elements, one SSPP element is composed of one metal plate and one metal floor, one sine cycle corresponds to the metal floor and a plurality of metal plates to form one radiating element.
5. The leaky wave antenna based on a three dimensional all metal SSPP structure according to claim 4, wherein the sinusoidal periodic modulation of the plurality of SSPP units is a modulation of the metal plate heights within the plurality of SSPP units;
and carrying out high sinusoidal modulation on the metal plates of different SSPP units in the radiation unit so as to convert the electromagnetic wave in the slow wave mode into the electromagnetic wave in the fast wave mode.
6. The leaky wave antenna based on a three dimensional all metal SSPP structure according to claim 5, wherein a pitch between adjacent two SSPP units is equal.
7. The leaky wave antenna based on three dimensional all metal SSPP structure according to claim 6, wherein the metal plate height and period of each SSPP unit satisfy: a, a<p<2a、Wherein a is the distance between two metal plates, p is the periodic distance of the metal plates of the SSPP unit, lambda h Modulating the cut-off wavelength of the waveguide for the sinusoidal period corresponding to the SSPP unit; the height of the sine period modulation waveguide corresponding to the radiation unit is as follows: />n is the number of the sine-period metal plates of one radiation unit, and i is the ith metal plate.
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Citations (8)
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