CN108879077B - Vortex electromagnetic wave generator - Google Patents
Vortex electromagnetic wave generator Download PDFInfo
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- CN108879077B CN108879077B CN201810594288.8A CN201810594288A CN108879077B CN 108879077 B CN108879077 B CN 108879077B CN 201810594288 A CN201810594288 A CN 201810594288A CN 108879077 B CN108879077 B CN 108879077B
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- magnetic ferrite
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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
- H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
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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
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Abstract
The invention discloses a vortex electromagnetic wave generator, which comprises a first metal plate, a soft magnetic ferrite, a second metal plate, a permanent magnetic ferrite and a probe, wherein the soft magnetic ferrite is of a cylindrical structure, the first metal plate is fixedly arranged on the upper surface of the soft magnetic ferrite, and the radius of the first metal plate is smaller than that of the soft magnetic ferrite; the second metal plate is fixedly arranged on the lower surface of the soft magnetic ferrite, and the radius of the soft magnetic ferrite is smaller than that of the second metal plate; the second metal plate is provided with a through hole, and the probe can pass through the through hole; the permanent magnetic ferrite is arranged below the second metal plate, and the cross section area of the permanent magnetic ferrite is larger than that of the soft magnetic ferrite; the second metal plate is connected with a threaded rod, the permanent magnetic ferrite is provided with a through hole, and threads matched with the threaded rod are machined in the through hole. The vortex electromagnetic wave generator can generate vortex electromagnetic waves with different frequency bands and different angular momentum modes, and has the advantages of simple structure, easy processing and easy realization.
Description
Technical Field
The invention belongs to the field of electronic devices of wireless communication systems, and particularly relates to a vortex electromagnetic wave generator.
Background
The vortex electromagnetic wave is an electromagnetic beam having a helical phase plane and an azimuthal component, with orbital angular momentum. The vortex electromagnetic wave of the optical frequency band can be applied to optical tweezers and optical wrenches to realize microscopic operation, and can also be applied to various aspects such as super-resolution imaging and quantum information technology. The vortex electromagnetic waves with the microwave frequency range can be applied to the field of wireless communication, a plurality of channels can be realized under the same frequency by utilizing the vortex electromagnetic waves with different orbital angular momentums, and the capacity of the wireless communication channels is obviously improved, so that the problem of shortage of current wireless communication frequency spectrum resources is solved.
How to generate the vortex electromagnetic waves with different orbital angular momentum is a technical problem to be solved. Currently, various methods of generating vortex electromagnetic waves have been studied. The method mainly comprises the following steps: (1) The planar wavefront is converted into the spiral wavefront by utilizing the phase modulation effect of the step-shaped spiral phase plate, the structure is simple, but the processing requirement is high, and the method is mainly applied to the optical frequency band or the high frequency band above millimeter waves; (2) The vortex wave is realized in the array structure antenna by adopting a spiral phase feeding mode, and the array structure antenna can be used for microwave frequency bands with lower frequency, but the antenna structure and the feeding structure are complex, the phase and amplitude control difficulty of the feeding part is high, and particularly when the number of orbital angular momentum modes is large, the structure tends to be huge and complex, and the realization difficulty is extremely high; (3) The vortex electromagnetic wave is realized by using the orthogonal feed circular traveling wave waveguide, the structure is simple and convenient to process, but the orthogonal feed structure is complex, and once the structure is fixed, the vortex mode and the working frequency are fixed immediately, and tuning cannot be performed; (4) Vortex electromagnetic waves are generated based on an artificial surface plasmon mode, vortex waves with different orbital angular momentum mode numbers can be obtained at different frequencies, but the structure of the vortex waves needs fine design and processing, and multimode regulation and control and frequency band tuning cannot be realized. Therefore, it is necessary to design a vortex electromagnetic wave generator which has a simple structure and adjustable working frequency and can generate different angular momentum modes.
Disclosure of Invention
The invention aims to provide a vortex electromagnetic wave generator which has a simple structure and adjustable working frequency and can generate different angular momentum mode numbers.
In order to achieve the above purpose, the invention provides a vortex electromagnetic wave generator, which comprises a first metal plate, a soft magnetic ferrite, a second metal plate, a permanent magnetic ferrite and a probe, wherein the soft magnetic ferrite is of a cylindrical structure, the first metal plate is fixedly arranged on the upper surface of the soft magnetic ferrite, and the radius of the first metal plate is smaller than that of the soft magnetic ferrite; the lower surface of the soft magnetic ferrite is fixedly provided with a second metal plate, and the radius of the soft magnetic ferrite is smaller than that of the second metal plate; the second metal plate is provided with a through hole, and the probe can pass through the through hole; the permanent magnetic ferrite is arranged below the second metal plate, and the cross section area of the permanent magnetic ferrite is larger than that of the soft magnetic ferrite; the second metal plate is connected with a threaded rod, the permanent magnetic ferrite is provided with a through hole, and threads matched with the threaded rod are machined in the through hole.
As a further limiting scheme of the invention, the permanent magnetic ferrite material is strontium ferrite or barium ferrite or neodymium iron boron permanent magnet.
As a further limiting aspect of the present invention, the material of the soft magnetic ferrite is yttrium iron garnet ferrite or magnesium manganese ferrite or nickel zinc ferrite.
As a further limiting scheme of the invention, the permanent magnetic ferrite is of a cylindrical structure.
As a further limiting aspect of the present invention, the first metal plate, the second metal plate and the threaded rod are all made of aluminum alloy.
As a further limiting scheme of the invention, the soft magnetic ferrite and the first metal plate and the soft magnetic ferrite and the second metal plate can be fixed by welding or conductive adhesive.
As a further limiting aspect of the present invention, the first metal plate, the soft magnetic ferrite, the second metal plate, and the permanent magnetic ferrite are arranged in a concentric manner.
After the structure is adopted, the permanent ferrite can provide a bias magnetic field for the soft ferrite, so that magnetic surface plasmons are generated on the surface of the soft ferrite, a probe penetrates through a through hole in the second metal plate to feed, the magnetic surface plasmons are excited, the magnetic surface plasmons are enabled to conduct circumferential propagation on the surface of the soft ferrite, a circumferential traveling wave mode is formed, the circumferential traveling wave can radiate energy to space, and the space phases are distributed in a spiral mode, so that vortex electromagnetic waves are generated. The frequency and the angular momentum mode number of the vortex electromagnetic wave can be adjusted by changing the strength of the bias magnetic field provided by the permanent magnetic ferrite. The permanent magnetic ferrite providing the bias magnetic field is provided with a through hole provided with threads, the second metal plate is connected with a threaded rod, the threaded rod is matched with the threads of the permanent magnetic ferrite through hole, the permanent magnetic ferrite is rotated on the threaded rod, the distance between the permanent magnetic ferrite and the second metal plate is changed, the strength of the bias magnetic field provided by the permanent magnetic ferrite can be changed, the strength of the bias magnetic field is weakened along with the increase of the distance between the permanent magnetic ferrite and the second metal plate, the energy radiated by the annular traveling wave to the space is changed, and finally, the vortex electromagnetic waves with different frequencies and angular momentum modes can be obtained.
The strength of the bias magnetic field can be adjusted by changing the material of the permanent magnetic ferrite besides changing the distance between the permanent magnetic ferrite and the second metal plate. The permanent magnetic ferrite can be made of strontium ferrite, barium ferrite or neodymium iron boron permanent magnet.
The first metal plate, the soft magnetic ferrite, the second metal plate and the permanent magnetic ferrite are arranged in a concentric manner, so that the whole soft magnetic ferrite is effectively ensured to be placed in a magnetic field provided by the permanent magnetic ferrite.
Compared with the existing vortex electromagnetic wave generator, the vortex electromagnetic wave generator provided by the invention has the advantages of simple structure, easiness in processing and realization, adjustable working frequency and capability of generating different angular momentum mode numbers.
Drawings
Fig. 1 is a schematic three-dimensional perspective view of the present invention.
Fig. 2 is a schematic diagram of structural parameters of the present invention.
Fig. 3 is a graph of simulation results of vortex electromagnetic wave vortex phase when angular momentum is 2 and 3.
Fig. 4 is a graph of radiation pattern simulation results for angular momentums 2 and 3.
FIG. 5 is a graph of simulation results of vortex wave frequency modulation when the bias magnetic field has a diagonal momentum of 2.
In the figure: 1. the device comprises a first metal plate 2, soft magnetic ferrite 3, a second metal plate 4, permanent magnetic ferrite 5, threaded rods 6 and a probe.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
As shown in fig. 1, the embodiment of the invention discloses a vortex electromagnetic wave generator, which comprises a first metal plate 1, a soft magnetic ferrite 2, a second metal plate 3, a permanent magnetic ferrite 4 and a probe 6, wherein the soft magnetic ferrite 2 is of a cylindrical structure, the upper surface of the soft magnetic ferrite 2 is fixedly provided with the first metal plate 1, and the radius of the first metal plate 1 is smaller than that of the soft magnetic ferrite 2; the lower surface of the soft magnetic ferrite 2 is fixedly provided with a second metal plate 3, and the radius of the soft magnetic ferrite 2 is smaller than that of the second metal plate 3; the second metal plate 3 is provided with a through hole through which the probe 6 can pass; the permanent magnetic ferrite 4 is arranged below the second metal plate 3, the cross section area of the permanent magnetic ferrite 4 is larger than that of the soft magnetic ferrite 2, and the cross section area of the permanent magnetic ferrite is larger than that of the soft magnetic ferrite, so that the soft magnetic ferrite can be ensured to be completely placed in a bias magnetic field provided by the permanent magnetic ferrite; the second metal plate 3 is connected with a threaded rod 5, a through hole is formed in the permanent magnetic ferrite 4, and threads matched with the threaded rod are machined in the through hole.
Fig. 2 shows a schematic structural parameter of an embodiment of the present invention, in which the soft magnetic ferrite material is yttrium iron garnet ferrite, its saturation magnetization is 4pi ms=1800 Gauss, the dielectric constant epsilon=15, the soft magnetic ferrite is a cylindrical structure, its radius rf=9 mm, and the height hf=5 mm. The first metal plate and the second metal plate are aluminum alloy plates, the thickness Ha1=Ha2=1 mm, the radius is Ra 1=8.5 mm, and Ra2=14 mm respectively; the radius of the first metal plate should be smaller than that of the soft magnetic ferrite to ensure that magnetic surface plasmons can be generated on the soft magnetic ferrite and that the toroidal traveling wave can radiate energy outwards after excitation. The threaded rod is made of aluminum alloy, has the length hd=20 mm and the outer diameter md=3 mm; the permanent magnetic ferrite is a neodymium iron boron permanent magnet, the permanent magnetic ferrite is of a cylindrical structure, the radius of the permanent magnetic ferrite is Rm=9.5 mm, and the height of the permanent magnetic ferrite is Hm=5 mm. The distance ht=10mm between the permanent magnetic ferrite and the second metal plate; the first metal plate, the soft magnetic ferrite, the second metal plate and the permanent magnetic ferrite are concentrically arranged. Probe radius rp=0.5 mm, probe height hp=6 mm; the radius of the through hole rh=1.5 mm on the second metal plate, the distance lp=11 mm from the center of the second metal plate, the closer the through hole is to the center of the second metal plate, the higher the excitation efficiency of the probe.
The probe is fed through a through hole inserted in the second metal plate, and vortex electromagnetic waves are generated. Fig. 3 is a simulation diagram of the phase of the vortex electromagnetic wave, wherein fig. 3 (a) shows that at the center frequency of the generator of 5GHz, the electromagnetic wave spatial phase is spirally distributed, namely, the vortex electromagnetic wave. It can be seen that the phase goes through 2 cycles from 0 ° to 360 ° in the circumferential distribution, where the number of angular momentum modes is 2; because of the resonance phenomenon, different frequencies and angular momentum mode numbers are generated under the same parameter condition, and fig. 3 (b) shows that under the parameter condition, when the center frequency of the generator is 6GHz, the electromagnetic wave spatial phase is spirally distributed, and is a vortex electromagnetic wave. The phase at this time goes through 3 cycles from 0 ° to 360 ° in the circumferential distribution, and the number of angular momentum modes is 3.
Fig. 4 is a radiation pattern diagram of the vortex electromagnetic wave generator under the parameter condition, the radiation pattern diagram generated when the center frequency of the generator is 5GHz is shown in fig. 4 (a), and fig. 4 (a) shows that the vortex electromagnetic wave angular momentum mode number is 2 when the center frequency is 5GHz, the gain is 3.8dBi, the main lobe width is 94 degrees, and good radiation characteristics are shown. Fig. 4 (b) shows that the number of eddy electromagnetic wave angular momentum modes generated at the frequency of 6GHz is 3, the gain is 3.3dBi, the main lobe width is 103 °, and good radiation characteristics are exhibited.
And rotating the permanent magnetic ferrite on the threaded rod, changing the distance between the permanent magnetic ferrite and the second metal plate, and accordingly changing the strength of the bias magnetic field, and finally realizing the adjustment of the frequency and the angular momentum mode number. FIG. 5 shows a simulation diagram of the frequency regulation of the vortex electromagnetic wave with the diagonal momentum mode number of 2 after changing the distance between the permanent ferrite and the second metal plate. As can be seen from the figure, when the angular momentum mode number of the vortex electromagnetic wave is 2, when the distance Ht between the permanent magnetic ferrite and the second metal plate is reduced from 10mm to 6mm and then to 4mm, the bias magnetic field provided by the permanent magnetic ferrite is enhanced, when the bias magnetic field is increased from 600Oe to 800Oe and then to 1000Oe, the center frequency is increased from 4.5GHz to 5GHz and then to 5.5GHz, the angular momentum mode number corresponding to the three diagrams a1, b2 and c3 (changing along the direction of the white arrow) in the figure 5 is 2, and the vortex electromagnetic wave cannot be generated at other frequencies corresponding to other diagrams in the figure 5, so that the regulation characteristics of the magnetic field on the frequency and the angular momentum mode number of the vortex electromagnetic wave are proved.
When the number of the vortex electromagnetic wave angular momentum modes is 3, when the distance Ht between the permanent magnetic ferrite and the second metal plate is reduced from 10mm to 6mm and then to 4mm, the bias magnetic field provided by the permanent magnetic ferrite is enhanced, the bias magnetic field is increased from 600Oe to 800Oe and then to 1000Oe, at the moment, the center frequency is increased from 5.7GHz to 6GHz and then to 6.4GHz, and the vortex electromagnetic wave cannot be generated by other frequencies, so that the regulation and control characteristics of the magnetic field on the vortex electromagnetic wave frequency and the angular momentum modes are proved.
The foregoing is only a preferred embodiment of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from its scope.
Claims (6)
1. A vortex electromagnetic wave generator, characterized in that: the magnetic resonance type magnetic resonance device comprises a first metal plate, a soft magnetic ferrite, a second metal plate, a permanent magnetic ferrite and a probe, wherein the soft magnetic ferrite is of a cylindrical structure, the first metal plate is fixedly arranged on the upper surface of the soft magnetic ferrite, and the radius of the first metal plate is smaller than that of the soft magnetic ferrite; the second metal plate is fixedly arranged on the lower surface of the soft magnetic ferrite, and the radius of the soft magnetic ferrite is smaller than that of the second metal plate; the second metal plate is provided with a through hole, and the probe can pass through the through hole; the permanent magnetic ferrite is arranged below the second metal plate, and the cross section area of the permanent magnetic ferrite is larger than that of the soft magnetic ferrite; the second metal plate is connected with a threaded rod, the permanent magnetic ferrite is provided with a through hole, and threads matched with the threaded rod are machined in the through hole;
the permanent magnetic ferrite is of a cylindrical structure;
the first metal plate, the soft magnetic ferrite, the second metal plate and the permanent magnetic ferrite are distributed in a concentric manner.
2. A vortex electromagnetic wave generator as set forth in claim 1 wherein: the permanent magnetic ferrite is made of strontium ferrite, barium ferrite or neodymium iron boron permanent magnet.
3. A vortex electromagnetic wave generator as set forth in claim 1 wherein: the soft magnetic ferrite is made of yttrium iron garnet ferrite or magnesium manganese ferrite or nickel zinc ferrite.
4. A vortex electromagnetic wave generator as set forth in claim 1 wherein: the second metal plate is welded with the threaded rod in a connecting mode.
5. A vortex electromagnetic wave generator as set forth in claim 1 wherein: the soft magnetic ferrite and the first metal plate and the soft magnetic ferrite and the second metal plate can be fixed by welding or conductive adhesive.
6. The vortex electromagnetic wave generator of claim 1 wherein: the first metal plate, the second metal plate and the threaded rod are all made of aluminum alloy.
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| CN201810594288.8A CN108879077B (en) | 2018-06-11 | 2018-06-11 | Vortex electromagnetic wave generator |
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| CN201810594288.8A CN108879077B (en) | 2018-06-11 | 2018-06-11 | Vortex electromagnetic wave generator |
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| CN108879077A CN108879077A (en) | 2018-11-23 |
| CN108879077B true CN108879077B (en) | 2023-07-18 |
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