CN111682301B - Electromagnetic flying ring generator based on annular antenna array - Google Patents
Electromagnetic flying ring generator based on annular antenna array Download PDFInfo
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- CN111682301B CN111682301B CN202010434917.8A CN202010434917A CN111682301B CN 111682301 B CN111682301 B CN 111682301B CN 202010434917 A CN202010434917 A CN 202010434917A CN 111682301 B CN111682301 B CN 111682301B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
Abstract
The invention discloses an electromagnetic flying ring generator based on a ring antenna array, and belongs to the technical field of microwave antennas. The electromagnetic flying ring generator comprises a circular metal floor, 2N (N +1) antenna units arranged on the front surface of the floor and a coaxial feeder arranged on the back surface of the floor. The 2N × N +1 antenna units are distributed in a concentric circular ring shape, the 1 st ring to the nth ring are respectively arranged from the center of the circle to the outside, the N (N equals to 1 … N) th ring is provided with 4N antenna units, and the antenna units in the same ring have the same structure and are arranged at equal intervals. According to the invention, by constructing the annular antenna array, adopting a mode of direct radiation of the antenna array, selecting the electromagnetic flying ring analytic function as an excitation signal, after the excitation signal is radiated by the antenna array, the electromagnetic flying ring can be repaired into the electromagnetic flying ring by the self-repairing characteristic of the electromagnetic flying ring, and the realization of the toroidal topological structure of the electromagnetic flying ring is completed.
Description
Technical Field
The invention belongs to the technical field of microwave antennas, and particularly relates to an electromagnetic flying ring generator based on a ring antenna array.
Background
The electromagnetic flying ring is used as a finite energy pulse solution of a Maxwell equation set and has a toroidal topology structure. The electric field of the TE electromagnetic flying ring is distributed in a ring shape on the cross section perpendicular to the propagation direction, the magnetic field rotates around the electric field to form a closed loop, the position of the electric field and the position of the magnetic field of the TE electromagnetic flying ring are interchanged to obtain the TM electromagnetic flying ring, and the electromagnetic flying ring has strong longitudinal field components on the propagation axis. Meanwhile, the wave equation solution of the electromagnetic flying ring has the characteristic of inseparability in space and time, so the electromagnetic flying ring has a very wide frequency spectrum and has different frequency spectrum distributions at different radiuses. In addition, the electromagnetic flyring also has a non-diffractive segment that may be much larger than the pulse wavelength. The unique characteristic of the electromagnetic flying ring has potential application in many aspects, and the electromagnetic flying ring has important application prospect in many aspects such as no track acceleration, novel multipole excitation, localized energy/information transmission, high-sensitivity detection and the like. Research has shown that the electromagnetic flying ring can effectively excite a Toroidal dipole, and the strong longitudinal field component of the electromagnetic flying ring on the propagation axis can be used for spatial particle acceleration. The non-diffractive segment of the electromagnetic flying ring can be used for localized energy transmission and communication. However, the practical production of electromagnetic flyrings faces a number of difficulties due to their unique topology and spectral distribution that varies with spatial location.
The document "Properties of Electromagnetic beams generated by Electromagnetic sources-with band bandwidth Pulse-driven arrays (R.W. Ziolkowski IEEE Transactions on Antennas and Propagation,1992,40(8): 888-. The idea proposes that the corresponding position of the antenna array emits electromagnetic waves according to the spatial frequency and amplitude distribution of the EDEPTs, so that the corresponding EDEPTs can be generated. Electromagnetic flyrings, as a special kind of EDEPTs, can in principle also be produced in this way. However, this document only proposes the idea that the antenna arrangement, polarization, excitation signal and the like are not given to the problem when the antenna array is used to generate the electromagnetic flying ring.
Disclosure of Invention
The present invention is to solve the above technical problems, and an object of the present invention is to provide a loop antenna array for generating an electromagnetic flying ring.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an electromagnetic flying ring generator based on a ring antenna array comprises a circular metal floor, 2N (N +1) antenna units arranged on the front surface of the floor and a coaxial feeder arranged on the back surface of the floor.
The 2N × N +1 antenna units are distributed in a concentric circular ring shape, the 1 st ring to the nth ring are respectively arranged from the center of the circle to the outside, the N (N is 1 … N) th ring is provided with 4N antenna units, and the antenna units in the same ring are identical in structure and are arranged at equal intervals. The distance between two adjacent rings is three times of the wavelength of the electromagnetic flying ring, the distance from the 1 st ring to the circle center is also three times of the wavelength of the electromagnetic flying ring, and N is determined by the electric field distribution of the electromagnetic flying ring.
The coaxial feeder line is provided with 2N (N +1) SMA joints, each SMA joint corresponds to one antenna unit, and the excitations fed by different antenna units are obtained by solving the integral of the wave equation of the electromagnetic flying ring.
Further, the antenna units are arranged along the tangential direction, and then TE electromagnetic flying rings are generated by the electromagnetic flying ring generator; and the antenna units are placed along the radial direction, and the electromagnetic flying ring generator generates TM electromagnetic flying rings.
Further, the antenna unit is a magneto-electric dipole antenna or a vivaldi antenna. The operating frequency of each loop antenna element is determined by the electromagnetic flying ring spectrum at the corresponding position.
The invention has the beneficial effects that:
(1) the invention adopts the mode of direct radiation of the antenna array, further simplifies the design flow on the basis of realizing the generation of the electromagnetic flying ring, has simple structure and reduces the undesirable problem caused by the combination of a plurality of devices.
(2) The invention can realize the toroidal topological structure of the electromagnetic flying ring by constructing the annular antenna array.
(3) The electromagnetic flying ring self-repairing method selects the electromagnetic flying ring analytic function as the excitation signal, and after the excitation signal is radiated by the antenna array, the electromagnetic flying ring can be repaired into the electromagnetic flying ring by the self-repairing characteristic of the electromagnetic flying ring, so that the realization of the electromagnetic flying ring is completed.
Drawings
FIG. 1 is a three-dimensional perspective view of a TE electromagnetic flying ring generator according to the present invention;
FIG. 2 is a top view of the TE electromagnetic fly ring generator of the present invention;
FIG. 3 is a three-dimensional perspective view of the TM electromagnetic flying ring generator of the present invention;
FIG. 4 is a top view of the TM electromagnetic flying ring generator of the present invention;
fig. 5 is a front view of the magnetoelectric dipole antenna unit according to the present embodiment;
FIG. 6 is a reverse side view of the magnetoelectric dipole antenna element according to the present embodiment;
FIG. 7 is a simulation diagram of the propagation state of the electric field of the electromagnetic flying ring radiated by the antenna.
Detailed Description
The invention is further described below with reference to the figures and examples.
The present embodiment provides a TE electromagnetic flying ring generator based on a circular antenna array, which is shown in fig. 1 in a three-dimensional perspective view and fig. 2 in a top view. The antenna comprises a circular metal floor, 112 antenna units arranged on the front surface of the floor and 112 SMA joints correspondingly arranged on the back surface of the floor. The 112 antenna units are distributed in a concentric circular ring shape, are arranged along the tangential direction and are vertically fixed on the metal floor 1, the positions from the center of the circle to the outside are respectively from the 1 st ring to the 7 th ring, and the electric field value of the electromagnetic flying ring processed at the position corresponding to the 7 th ring is reduced to be less than 0.2 of the maximum value. Four identical antenna units 2 are arranged in the 1 st ring, the angular intervals of the adjacent antenna units 2 are 90 degrees, and the distance between the antenna units 2 and the circle center is three times of wavelength; eight same antenna units 3 are arranged in the 2 nd ring, the angular intervals of the adjacent antenna units 3 are 45 degrees, and the distance between the antenna units 3 and the circle center is six times of wavelength; by analogy, twenty-eight identical antenna units 8 are arranged on the 7 th ring, the angular intervals of the adjacent antenna units 8 are 12.86 degrees, and the distance between the antenna units 8 and the circle center is twenty-one times of wavelength.
In this embodiment, 112 SMA connectors are adopted to respectively correspond to one antenna unit, and different excitations are fed in, where an excitation waveform is obtained by integrating solutions of ideal electromagnetic flying ring wave equations at corresponding positions, and the following formula is a solution in a cylindrical coordinate system of the ideal electromagnetic flying ring wave equation:
where σ is z + ct, τ is z-ct, z is the axial propagation distance, t is the propagation time, f0Is a normalization constant, and ρ is the radius. EθIs a tangential electric field in a cylindrical coordinate system, HρIs a radial magnetic field H in a cylindrical coordinate systemzIs a z-direction magnetic field under a cylindrical coordinate system. c is the speed of light in vacuum, epsilon0Dielectric constant in vacuum, μ0Is the permeability in vacuum. q. q.s1Denotes the wavelength, q2Denotes the length of the non-diffraction zone, q in this example1＝0.01m,q2＝800q1。
In this embodiment, the antenna unit is a magnetic-electric dipole antenna, as shown in fig. 5, the front surface of the magnetic-electric dipole is shown, and as shown in fig. 6, the back surface of the magnetic-electric dipole is shown. The antenna unit comprises a rectangular dielectric substrate, a vibrator arm 9 positioned on the front surface of the dielectric substrate and a bent step-shaped feeder line 11 positioned on the back surface of the dielectric substrate. The antenna element substrate is made of F4B and has a thickness of 0.8 mm. The oscillator arm 9 is two shape of falling L metal paster that mirror symmetry set up, and the notch cuttype feeder 11 of buckling comprises the three-step metal paster and the extension section of L type buckling, and the feed port is regarded as to three-step metal paster broadside one end, and the L type extension section of buckling is 90 degrees contained angles with the junction of three-step metal paster. The working frequency of the antenna unit at different radius positions is determined by the electromagnetic flying ring frequency spectrum at the corresponding position, and the working frequency range of the antenna unit covers the frequency range of the electromagnetic flying ring frequency spectrum at the position which is reduced to 95% of the maximum value.
Based on the scheme, the annular distribution of the antenna array can meet the requirement of a toroidal topological structure of the electromagnetic flying ring on the electromagnetic field distribution; the requirements of each position on the frequency spectrum distribution are met by restricting the working frequency of the antenna unit at each position; the ideal electromagnetic flying ring is adopted for excitation, the radiation is carried out through the antenna unit, and after the electromagnetic flying ring is transmitted for a distance, the more ideal electromagnetic flying ring state can be obtained through the self-repairing characteristic of the electromagnetic flying ring.
Fig. 7 shows the electric field distribution of the TE electromagnetic flying ring on the surface in the propagation direction after being radiated by the antenna unit, and the ideal electric field distribution of the electromagnetic flying ring can be obtained after the TE electromagnetic flying ring is propagated for a distance.
In summary, in this embodiment, an electromagnetic flying ring generator is constructed based on an annular electric field or a magnetic field generated by an annular antenna array, and polarization distribution matched with the electromagnetic flying ring is generated, so that a toroidal topological structure of the electromagnetic flying ring is realized. By regulating and controlling the working frequency of the antenna unit, the field generated by the array meets the spectrum distribution of the electromagnetic flying ring. Meanwhile, ideal electromagnetic flying ring excitation is fed in, and a better electromagnetic flying ring generation effect is obtained.
Claims (4)
1. An electromagnetic flying ring generator based on a ring antenna array comprises a circular metal floor, 2N (N +1) antenna units arranged on the front surface of the floor and a coaxial feeder arranged on the back surface of the floor;
the 2N × N +1 antenna units are distributed in a concentric circular ring shape, and are respectively a 1 st ring to an nth ring from the center of the circle to the outside, and the nth ring is provided with 4N antenna units, wherein N is 1 … N, and the antenna units in the same ring have the same structure and are arranged at equal intervals; the distance between two adjacent rings is three times of the wavelength of the electromagnetic flying ring, the distance from the 1 st ring to the circle center is also three times of the wavelength of the electromagnetic flying ring, and the value of N is determined by the electric field distribution of the electromagnetic flying ring;
the coaxial feeder line is provided with 2N (N +1) SMA joints, each SMA joint corresponds to one antenna unit, and the excitations fed by different antenna units are obtained by solving the integral of the wave equation of the electromagnetic flying ring.
2. The electromagnetic flying ring generator based on the loop antenna array as claimed in claim 1, wherein the antenna elements are placed in a tangential direction, so that the electromagnetic flying ring generator generates the TE electromagnetic flying ring; and the antenna units are placed along the radial direction, and the electromagnetic flying ring generator generates TM electromagnetic flying rings.
3. The electromagnetic flying-ring generator based on a loop antenna array as claimed in claim 1, wherein the operating frequency of each loop antenna element is determined by the electromagnetic flying-ring spectrum at the corresponding location.
4. The electromagnetic flying-ring generator based on the circular antenna array as claimed in claim 1, wherein said antenna elements are magnetoelectric dipole antennas or vivaldi antennas.
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| CN202010434917.8A CN111682301B (en) | 2020-05-21 | 2020-05-21 | Electromagnetic flying ring generator based on annular antenna array |
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| CN206471491U (en) * | 2016-10-31 | 2017-09-05 | 宁夏大学 | A kind of multi-modal OAM electromagnetism vortex ripple array antenna of twin nuclei |
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| US5453752A (en) * | 1991-05-03 | 1995-09-26 | Georgia Tech Research Corporation | Compact broadband microstrip antenna |
| US5515060A (en) * | 1995-05-11 | 1996-05-07 | Martin Marietta Corp. | Clutter suppression for thinned array with phase only nulling |
| US8878737B2 (en) * | 2009-06-29 | 2014-11-04 | Blackberry Limited | Single feed planar dual-polarization multi-loop element antenna |
| CN102104191B (en) * | 2010-11-16 | 2013-08-07 | 浙江大学 | Homocentric ring antenna array based on realization of central concave directional diagram |
| CN110289482A (en) * | 2019-05-29 | 2019-09-27 | 深圳大学 | A kind of wide surface antenna unit of broadband dual polarization pair and aerial array |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103943961A (en) * | 2014-04-16 | 2014-07-23 | 厦门大学 | Electric scanning antenna based on space phase shift surface |
| CN206471491U (en) * | 2016-10-31 | 2017-09-05 | 宁夏大学 | A kind of multi-modal OAM electromagnetism vortex ripple array antenna of twin nuclei |
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| Subwavelength Field Shaping Approach Based on Time Reversal Technique and Defective Metasurface;Ren Wang 等;《IEEE Access》;20190628;全文 * |
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