CN113629896A - Microwave energy transmission system based on near-field focusing non-array antenna - Google Patents
Microwave energy transmission system based on near-field focusing non-array antenna Download PDFInfo
- Publication number
- CN113629896A CN113629896A CN202110736006.5A CN202110736006A CN113629896A CN 113629896 A CN113629896 A CN 113629896A CN 202110736006 A CN202110736006 A CN 202110736006A CN 113629896 A CN113629896 A CN 113629896A
- Authority
- CN
- China
- Prior art keywords
- antenna
- microwave
- receiving
- feed source
- ellipsoid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A near-field focused non-array antenna based microwave energy delivery system comprising: the microwave transmitter, the receiving/transmitting antenna system and the microwave rectifying circuit; the receiving/transmitting antenna system is a pair of mutually conjugated near-field focusing antennas, and the antennas adopt an ellipsoid reflecting surface form; determining the aperture and carrier frequency of a transmitting and receiving antenna according to the energy transmission efficiency and the required transmission distance required by the microwave energy transmission system; the microwave transmitter realizes the conversion from direct current power to microwave power, the transmitting antenna transmits microwave energy, the receiving antenna receives the microwave energy after free space transmission, and the microwave rectifying circuit rectifies and converts the microwave energy into direct current energy to complete the power supply of a target. The invention solves the problems that the transmission efficiency is improved by increasing the receiving and intercepting area in the traditional energy transmission scheme, the energy transmission distance is equal to the focusing distance of the antenna, the array antenna has feed network loss, complicated structure and overhigh cost, and the energy loss is caused by the direct current synthesis of a rectifying circuit.
Description
Technical Field
The invention relates to a microwave energy transmission system, and belongs to the field of radio frequency radio transmission.
Background
The wireless energy transmission technology is used as a novel energy transmission mode, energy can be transmitted in a wireless mode in a long distance, and the starting point and the end point of the energy transmission can be any two-two combination among the ground, the air and the sky. The energy transfer is carried out in free space without any guided wave, the transmission speed is the speed of light, and the energy transfer can be flexibly changed by controlling the beam direction. The working process of the microwave energy conversion device is that a microwave source converts direct current energy into microwave energy, the microwave energy is sent to a free space through an antenna, a beam replaces a high-voltage line to achieve remote energy transmission, and a user end receives the microwave energy through the antenna and achieves direct current energy conversion output. The method can be used in the application fields of solar power stations, deep space exploration and the like.
Different from the traditional signal communication system, the core of the microwave wireless energy transmission is high energy transmission efficiency and high energy conversion efficiency, and the microwave wireless energy transmission mainly comprises a high-power high-efficiency microwave emission source, high-efficiency transmitting and receiving antenna transmission, a high-efficiency microwave rectifying circuit, direct current management and other key modules. The total efficiency of the whole system is the product of the efficiencies of all links, so that the efficiency of each link cannot be ignored by the whole energy transmission system.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the microwave energy transmission system based on the near-field focusing non-array antenna overcomes the defects of the prior art, adopts a pair of conjugate ellipsoidal reflecting surface antennas as receiving/transmitting antennas to realize wireless transmission of microwave energy, solves the energy loss caused by a direct current synthesis circuit when a receiving system adopts a rectifying array antenna in the traditional energy transmission scheme, solves the problem that the RF-RF transmission efficiency is improved by increasing the interception area in a microwave energy transmission system, solves the problems that a receiving antenna is arranged at the focus of a transmitting antenna and the energy transmission distance is the antenna focusing distance in the traditional microwave energy transmission scheme, and solves the problems that the array antenna in the traditional microwave energy transmission scheme has feed network loss, complex structure, overhigh cost and the like.
The technical scheme adopted by the invention is as follows: a near-field focused non-array antenna based microwave energy delivery system comprising: the microwave transmitter, the receiving/transmitting antenna system and the microwave rectifying circuit; the receiving/transmitting antenna system is a pair of mutually conjugated near-field focusing antennas, and the antennas adopt an ellipsoid reflecting surface form; determining the aperture and carrier frequency of a transmitting and receiving antenna according to the energy transmission efficiency required by the system and the required transmission distance; in a microwave energy transmission system, conversion from direct current power to microwave power is realized through a microwave transmitter, then microwave energy is transmitted out through a transmitting antenna, the microwave energy is received through a receiving antenna after being transmitted in free space, and finally the microwave energy is rectified and converted into direct current energy through a microwave rectifying circuit to finish power supply to a target.
The receiving/transmitting antenna system comprises an ellipsoidal reflector a, an ellipsoidal reflector b, a feed source a and a feed source b, and the schematic diagram is shown in figure 1. The ellipsoid reflector a is positioned in the ellipsoid a, and the surface of the ellipsoid a is obtained by rotating the ellipsoid a around the long axis thereof for a circle; the ellipsoid reflector b is positioned in the ellipsoid b, and the surface of the ellipsoid b is obtained by rotating the ellipsoid b around the long axis thereof for a circle; the major axes of ellipse a and ellipse b coincide, the two foci coincide at point F2, the feed a is placed at the other focus F1 of ellipse a, pointing to the center of ellipsoid reflector a, the feed b is placed at the other focus F3 of ellipse b, pointing to the center of ellipsoid reflector b. The ellipsoid reflecting surface has focusing capacity, electromagnetic waves emitted by the feed source a at a point F1 are reflected by the ellipsoid reflector a, energy convergence is realized at a focus F2, and beams are scattered by the F2, reflected by the ellipsoid reflector b and finally received by the feed source b.
The shape and the size of the ellipse a are the same as those of the ellipse b, and the length of the major axis and the length of the minor axis of the ellipse are set according to requirements; the feed source a and the feed source b have the same structure size and are variable opening angle light wall horns. The ellipsoidal reflector a is a transmitting antenna reflector, the feed source a is a transmitting feed source component, the ellipsoidal reflector b is a receiving antenna reflector, and the feed source b is a receiving feed source component.
The receiving/transmitting antenna is modeled in Grasp software, a moment method is adopted for simulation calculation, ideal transmission efficiency in different states is obtained by optimizing energy transmission distance, reflector profile size and feed source beam width, and a relation curve of RF-RF transmission efficiency and receiving/transmitting distance/Fresnel zone distance is obtained; and determining the Fresnel zone distance of the antenna according to the requirements on the transmission efficiency and the transmission distance of the required receiving/transmitting antenna by the relation curve.
Antenna finny zone distance R ═ 2D2X f/c, wherein the aperture of the antenna is D, the carrier frequency is f, and the speed of light is c. And determining the aperture and carrier frequency of the antenna according to the distance of the Fresnel area, wherein the aperture of the antenna is selected according to requirements.
Compared with the prior art, the invention has the advantages that:
(1) because the receiving end and the transmitting end both adopt the reflecting surface antennas, the invention avoids the energy loss of the direct current synthesis circuit part caused by the rectifier array antenna in the general microwave energy transmission scheme, reduces the complexity of the antenna at the same time, and is suitable for the aerospace field.
(2) According to the invention, a pair of conjugated near-field focusing ellipsoidal reflector antennas are used as receiving/transmitting antennas, so that the focusing point of the antenna is superposed with the center of the system, the energy transmission distance is twice of the focusing distance of the antenna, and a higher RF-RF transmission coefficient can be obtained within the range of an antenna Phillips area with the receiving and transmitting distance of 0.1-0.4 times.
(3) The microwave energy is focused in the aperture range of the antenna, energy leakage hardly exists, and the electromagnetic interference to the surrounding environment is effectively reduced.
(4) The invention can solve the problem that the RF-RF transmission efficiency is improved by increasing the interception area in a microwave energy transmission system, the invention reduces the divergence of microwave energy in the space transmission process by the beam focusing characteristic of the ellipsoid reflecting surface, the receiving/transmitting antenna meets the conjugate impedance matching, the center direction is aligned, the polarization is ideally matched, and higher transmission efficiency can be obtained compared with other energy transmission schemes with the same caliber, transmission distance and carrier frequency;
(5) the invention can solve the problem that the energy transmission distance is the focusing distance of the antenna when the receiving antenna is placed at the focusing point of the transmitting antenna in the traditional microwave energy transmission scheme, and the focusing point of the antenna is positioned at the center of the system in the invention, so that the energy transmission distance is twice of the focusing distance.
(6) The invention can solve the problems of feed network loss, complex structure, high cost and the like of the array antenna in the traditional microwave energy transmission scheme.
Drawings
FIG. 1 is a schematic diagram of a near-field focusing transmit/receive antenna;
fig. 2 is a diagram showing a relationship between transmission efficiency and transmission distance of the transmitting/receiving antenna (the curve in the diagram is a simulation result in an ideal state);
FIG. 3 is a schematic view of a variable flare angle optical wall horn;
fig. 4 is a schematic structural diagram of a near-field focusing transceiving antenna system.
Detailed Description
The invention is described with reference to the accompanying drawings.
As shown in fig. 1, a near-field focusing non-array antenna based microwave energy transmission system includes: the microwave transmitter, the receiving/transmitting antenna system and the microwave rectifying circuit; the receiving/transmitting antenna system is a pair of mutually conjugated near-field focusing antennas, and the antennas adopt an ellipsoid reflecting surface form; determining the aperture and carrier frequency of a transmitting and receiving antenna according to the energy transmission efficiency required by the system and the required transmission distance; in a microwave energy transmission system, conversion from direct current power to microwave power is realized through a microwave transmitter, then microwave energy is transmitted out through a transmitting antenna, the microwave energy is received through a receiving antenna after being transmitted in free space, and finally the microwave energy is rectified and converted into direct current energy through a microwave rectifying circuit to finish power supply to a target.
The receiving/transmitting antenna system comprises an ellipsoidal reflector a, an ellipsoidal reflector b, a feed source a and a feed source b, and the schematic diagram is shown in figure 1. The ellipsoid reflector a is positioned in the ellipsoid a, and the surface of the ellipsoid a is obtained by rotating the ellipsoid a around the long axis thereof for a circle; the ellipsoid reflector b is positioned in the ellipsoid b, and the surface of the ellipsoid b is obtained by rotating the ellipsoid b around the long axis thereof for a circle; the major axes of ellipse a and ellipse b coincide, the two foci coincide at point F2, the feed a is placed at the other focus F1 of ellipse a, pointing to the center of ellipsoid reflector a, the feed b is placed at the other focus F3 of ellipse b, pointing to the center of ellipsoid reflector b. The ellipsoid reflecting surface has focusing capacity, electromagnetic waves emitted by the feed source a at a point F1 are reflected by the ellipsoid reflector a, energy convergence is realized at a focus F2, and beams are scattered by the F2, reflected by the ellipsoid reflector b and finally received by the feed source b.
The shape and the size of the ellipse a are the same as those of the ellipse b, and the length of the major axis and the length of the minor axis of the ellipse are set according to requirements; the feed source a and the feed source b have the same structure size and are variable opening angle light wall horns. The ellipsoidal reflector a is a transmitting antenna reflector, the feed source a is a transmitting feed source component, the ellipsoidal reflector b is a receiving antenna reflector, and the feed source b is a receiving feed source component.
The receiving/transmitting antenna is modeled in Grasp software, a moment method is adopted for simulation calculation, ideal transmission efficiency in different states is obtained by optimizing energy transmission distance, reflector shape surface size and feed source beam width, and the relationship between the RF-RF transmission efficiency and the receiving/transmitting distance/Fresnel zone distance is shown in figure 2. The finny zone distance of the antenna is determined from fig. 2 according to the requirements of the system on the transmission efficiency and transmission distance of the desired receiving/transmitting antenna. In this embodiment, the receiving/transmitting antenna distance is 20m, the transmission efficiency is greater than 90%, the receiving/transmitting distance/finny zone distance is 0.13, and the antenna finny zone distance is 155 m.
Antenna finny zone distance R ═ 2D2X f/c, wherein the aperture of the antenna is D, the carrier frequency is f, and the speed of light is c. And determining the aperture and carrier frequency of the antenna according to the distance of the Fresnel area, wherein the aperture of the antenna is selected according to requirements. In the embodiment, the aperture of the antenna is 2m, the load frequency is 5.8GHz, and the structure sizes of the ellipsoidal reflector a and the ellipsoidal reflector b are the same;
the surface structures of the ellipsoidal reflector a and the ellipsoidal reflector b are designed, in the embodiment, the semimajor axis of the ellipsoidal surface where the ellipsoidal reflecting surface is located is 6m in length, the semiminor axis of the ellipsoidal reflecting surface is 4.05m in length, and the axis of the horn points to the center of the ellipsoidal reflecting surface and forms an included angle of 60 degrees with the elliptic major axis.
The feed source a and the feed source b are variable-opening-angle optical wall horns, as shown in fig. 3. In this embodiment, the size of the feed source a and the feed source b is the first-order opening angle diameter D146mm, height L146.93mm, second step angular diameter D280.66mm, height L262.82mm, third step opening angle diameter D3132.2mm, height L380.60mm, fourth step opening angle diameter D4160mm, height L4＝28.28mm。
The structure of the whole transmit-receive antenna system is shown in fig. 4.
According to the power configuration required by receiving and transmitting, a microwave transmitting and rectifying circuit of a single antenna radio frequency interface is connected with a receiving and transmitting antenna feed source to complete the whole microwave energy transmission system.
According to the actual measurement case of the C frequency band, the caliber of the transmitting reflecting surface and the caliber of the receiving reflecting surface are both 2 meters, and when the distance between the transmitting antenna and the receiving antenna is 20 meters, the transmission coefficient value between the 5.8GHz transmitting antenna feed source and the receiving antenna feed source is-1.3 decibels (namely, the transmission efficiency is 74 percent, and the transmission efficiency comprises the reflecting surface and the feed source system).
The present invention has not been described in detail, partly as is known to the person skilled in the art.
Claims (5)
1. A near-field focused non-array antenna based microwave energy delivery system, comprising: the microwave transmitter, the receiving/transmitting antenna system and the microwave rectifying circuit; the receiving/transmitting antenna system is a pair of mutually conjugated near-field focusing antennas, and the antennas adopt an ellipsoid reflecting surface form; determining the aperture and carrier frequency of a transmitting and receiving antenna according to the energy transmission efficiency and the required transmission distance required by the microwave energy transmission system; the microwave transmitter realizes the conversion from direct current power to microwave power, the transmitting antenna transmits microwave energy, the receiving antenna receives the microwave energy after free space transmission, and the microwave rectifying circuit rectifies and converts the microwave energy into direct current energy to complete the power supply of a target.
2. The near-field focusing non-array antenna based microwave energy transmission system as claimed in claim 1, wherein the receiving/transmitting antenna system comprises an ellipsoidal reflector a, an ellipsoidal reflector b, a feed source a and a feed source b; the ellipsoid reflector a is positioned in the ellipsoid a, and the surface of the ellipsoid a is obtained by rotating the ellipsoid a around the long axis thereof for a circle; the ellipsoid reflector b is positioned in the ellipsoid b, and the surface of the ellipsoid b is obtained by rotating the ellipsoid b around the long axis thereof for a circle; the major axes of the ellipse a and the ellipse b are coincided, the two focuses are coincided at a point F2, a feed source a is placed at the other focus F1 of the ellipse a, the feed source a points to the center of the ellipsoid reflector a, a feed source b is placed at the other focus F3 of the ellipse b, and the feed source b points to the center of the ellipsoid reflector b; after electromagnetic waves emitted by the feed source a at a point F1 are reflected by the ellipsoidal reflector a, energy convergence is realized at a focus F2, and beams are scattered by F2, reflected by the ellipsoidal reflector b and finally received by the feed source b; the shape and the size of the ellipse a are the same as those of the ellipse b, and the structure and the size of the feed source a are the same as those of the feed source b; the ellipsoidal reflector a is a transmitting antenna reflector, the feed source a is a transmitting feed source component, the ellipsoidal reflector b is a receiving antenna reflector, and the feed source b is a receiving feed source component.
3. The microwave energy transmission system based on the near-field focusing non-array antenna is characterized in that the feed sources a and b are variable-flare-angle optical wall horns.
4. The microwave energy transmission system based on the near-field focusing non-array antenna is characterized in that the lengths of the major axis and the minor axis of the ellipse a and the ellipse b are set according to requirements.
5. The near-field focusing non-array antenna-based microwave energy transmission system according to claim 4, characterized in that the receiving/transmitting antenna is modeled in Grasp software, a moment method is adopted for simulation calculation, ideal transmission efficiency in different states is obtained by optimizing energy transmission distance, reflector profile size and feed source beam width, and a relation curve of RF-RF transmission efficiency and receiving/transmitting distance/Fresnel zone distance is obtained; determining the Fresnel zone distance of the antenna according to the requirements on the transmission efficiency and the transmission distance of the required receiving/transmitting antenna and the relation curve of the RF-RF transmission efficiency and the receiving/transmitting distance/the Fresnel zone distance;
according to the distance R-2D2Determining the aperture and carrier frequency of the antenna by xf/c;
wherein D is the antenna aperture, f is the carrier frequency, and c is the speed of light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110736006.5A CN113629896A (en) | 2021-06-30 | 2021-06-30 | Microwave energy transmission system based on near-field focusing non-array antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110736006.5A CN113629896A (en) | 2021-06-30 | 2021-06-30 | Microwave energy transmission system based on near-field focusing non-array antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113629896A true CN113629896A (en) | 2021-11-09 |
Family
ID=78378749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110736006.5A Pending CN113629896A (en) | 2021-06-30 | 2021-06-30 | Microwave energy transmission system based on near-field focusing non-array antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113629896A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725677A (en) * | 2022-03-14 | 2022-07-08 | 中国电子科技集团公司第十四研究所 | Novel wide waveguide feed structure based on variable wavefront |
-
2021
- 2021-06-30 CN CN202110736006.5A patent/CN113629896A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725677A (en) * | 2022-03-14 | 2022-07-08 | 中国电子科技集团公司第十四研究所 | Novel wide waveguide feed structure based on variable wavefront |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111245492B (en) | Intelligent reflector selection method based on received power sequencing | |
| CN108701905B (en) | Horn antenna | |
| CN112332548B (en) | Wireless energy transmission method and system | |
| WO2020015386A1 (en) | Beam reconstruction method, antenna, microwave device, and network system | |
| CN102307062A (en) | Apparatus and method for wireless energy transmission in laser resonant coupling mode | |
| CN206878184U (en) | A kind of Double frequency feed source component and double frequency microwave antenna | |
| CN102570050B (en) | Microwave parabolic antenna with long-focus feedback super-high performance | |
| CN113629896A (en) | Microwave energy transmission system based on near-field focusing non-array antenna | |
| CN110120711B (en) | Autonomous dynamic wireless power receiving device and method based on time reversal | |
| CN109244676B (en) | Dual-frequency feed source assembly and dual-frequency microwave antenna | |
| CN105529538A (en) | High-power millimeter-wave broadband mode converter based on continuous grating structure | |
| CN115621738B (en) | Microwave antenna feed structure and microwave antenna system | |
| CN209119299U (en) | A kind of parabolic antenna feed source of double frequency shared | |
| CN209731215U (en) | A kind of broadband Ka/EHF transmit-receive sharing feed network | |
| CN114928838B (en) | Intelligent reflecting surface assisted symbiotic communication information transmission system and method | |
| CN109411870A (en) | A kind of parabolic antenna feed source of double frequency shared | |
| CN110545545B (en) | Indoor deep coverage system and method for 5G network | |
| CN113608036A (en) | High-efficiency high-precision calibration method for double-reflector antenna system | |
| CN106340978A (en) | Long-distance wireless power transmission system | |
| CN107682873B (en) | Millimeter wave outdoor passive coverage method | |
| CN212874768U (en) | Ku frequency band feed source horn for C, Ku and Ka three-frequency band 3-meter ring-focus antenna | |
| CN213341767U (en) | Flexibly expandable power terminal equipment | |
| CN211743408U (en) | Control device for adjusting electric downtilt of mobile communication antenna | |
| WO2024044956A1 (en) | Antenna and communication device | |
| CN220822710U (en) | Electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |