CN112103629A - Fabry-Perot resonant cavity antenna applied to wireless power transmission - Google Patents
Fabry-Perot resonant cavity antenna applied to wireless power transmission Download PDFInfo
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- CN112103629A CN112103629A CN202010975881.4A CN202010975881A CN112103629A CN 112103629 A CN112103629 A CN 112103629A CN 202010975881 A CN202010975881 A CN 202010975881A CN 112103629 A CN112103629 A CN 112103629A
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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
- H01Q1/36—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
Abstract
The invention relates to a Fabry-Perot resonant cavity antenna applied to wireless power transmission, and belongs to the technical field of antennas. The Fabry-Perot resonant cavity antenna applied to wireless power transmission is composed of a designed coating layer, a microstrip patch antenna and a metal floor. The upper surface of the structure unit of the coating is a cross aperture type frequency selection surface, the lower surface of the structure unit of the coating is a metal patch type frequency selection surface, the designed coating increases the gain of the feed source antenna by controlling the size and the shape of the frequency selection surface of the structure unit, and simultaneously keeps a lower distance between the coating and a metal floor, thereby realizing the ground profile, high gain, good directionality and miniaturization characteristics of the Fabry-Perot resonant cavity antenna.
Description
Technical Field
The invention belongs to the technical field of antennas, and relates to a Fabry-Perot resonant cavity antenna applied to wireless power transmission.
Background
The internet of things technology increasingly affects our lives nowadays, is more intelligent and brings great convenience to our lives, and becomes an important part in our lives. The problem of energy supply of a wide-range wireless sensor in the field of the internet of things is one of factors hindering the development of the internet of things, and the microwave wireless power transmission technology is one of important means for solving the problem. The microwave transmitting antenna is used as an important component applied to wireless power supply of the wireless sensor, and has the characteristics of miniaturization, high gain, low profile, simple structure and directionality. Fabry-Perot resonator antennas can meet the functional requirements of the above-mentioned transmitting antennas and have been receiving extensive attention from researchers.
The Fabry-Perot resonant cavity antenna mainly comprises an antenna coating, a feed source antenna and a metal floor, wherein the feed source antenna is generally embedded in the metal floor or placed on the metal floor and keeps a certain distance from the coating. The feed source antenna is used for exciting electromagnetic waves in the cavity, when the excited electromagnetic waves are incident on the antenna coating, one part of the excited electromagnetic waves is radiated to a free space through the coating, the other part of the excited electromagnetic waves is reflected to the metal floor, all the electromagnetic waves reflected to the upper layer of the metal floor are reflected, the part of the electromagnetic waves are reflected to the lower surface of the coating again, one part of the electromagnetic waves penetrates through the coating, the other part of the electromagnetic waves are continuously reflected to the metal floor, the circulation is repeated, and the electromagnetic field above the coating is excited by superposition of the electromagnetic waves which are reflected and transmitted for multiple times, so that the gain of the feed source antenna can be greatly improved compared with that before the coating is increased.
Because the electromagnetic wave radiated by the Fabry-Perot resonant cavity antenna is the result of superposition of the electromagnetic wave after multiple reflection and transmission, the reflection amplitude of the electromagnetic wave is influenced by the structure of the coating, namely the reflection and transmission processes of the electromagnetic wave are influenced, and the gain of the Fabry-Perot resonant cavity antenna can be improved by reasonably designing the structure of the coating. The structure of the cladding layer can also influence the reflection phase of the electromagnetic wave, and the reflection phase of the electromagnetic wave at the working frequency can be kept near 0 degree by reasonably designing the structure of the cladding layer, so that the profile of the Fabry-Perot resonant cavity antenna can be reduced, and the miniaturization of the antenna is realized. The invention successfully reduces the profile of the Fabry-Perot resonant cavity antenna based on designing a novel frequency selection surface which has the characteristics of zero crossing of the reflection phase of the electromagnetic wave at the working frequency and high reflection amplitude, and simultaneously leads the antenna to have higher gain.
Disclosure of Invention
Accordingly, the present invention is directed to a Fabry-Perot resonator antenna for wireless power transmission.
In order to achieve the purpose, the invention provides the following technical scheme:
a Fabry-Perot resonant cavity antenna applied to wireless power transmission comprises a covering layer, a feed source antenna and a metal floor;
the covering layer is formed by periodically arranging unit structures and is positioned right above the feed source antenna;
the feed source antenna is a microstrip patch antenna with the resonant frequency of 5.8GHz, and the feeding mode is coaxial feeding;
the metal floor is the same size as the cladding and is located at the lowest level of the antenna, directly opposite the cladding.
Optionally, the cladding is formed by arranging unit structures in a 9 × 9 manner, the size of the cladding is 91mm × 2mm, the gain of the microstrip patch antenna is improved by 3.8dBi through the cladding, the distance between the microstrip patch antenna and the floor is reduced to 0.2504 times of the operating wavelength, the reflection amplitude of the cladding on electromagnetic waves at 5.8GHz reaches 0.93, and the reflection phase is 0.27 °.
Optionally, the unit structure comprises a cross-aperture type frequency selective surface, an ArlonAD260A dielectric substrate with a relative dielectric constant of 2.6, and a metal patch type frequency selective surface, and the size is 9mm by 2 mm;
the upper surface of the unit structure is a cross aperture type frequency selection surface and is formed by two 7.7mm 0.6mm rectangular hollow 9mm metal layers positioned right above the unit structure, and the lower surface of the unit structure is a metal patch type frequency selection surface and is formed by 8.3mm metal layers positioned right below the unit structure;
the middle structure of the unit structure is ArlonAD260A dielectric substrate with 9mm 2 mm.
Optionally, the feed source antenna is a microstrip patch antenna, the microstrip patch antenna adopts a coaxial feed mode, the metal patch size of the microstrip patch antenna is 16.2mm × 18.5mm, the dielectric layer is a Rogers5880 substrate with a thickness of 30mm × 40mm × 1mm, the reflection coefficient of the microstrip patch antenna at 5.8GHz is the minimum, the maximum gain value is 8.4dBi, and the direction of the maximum gain value is right above the microstrip patch antenna.
Optionally, the Fabry-Perot resonator antenna has a size of 91mm x 14.95mm, a maximum gain of 12dBi directly above the Fabry-Perot resonator antenna, and a simulated value of 12.23 dBi.
The invention has the beneficial effects that:
(1) the cladding structure resonates at the working frequency of 5.8GHz, has a high reflection amplitude which reaches 0.93, and simultaneously, the reflection phase of electromagnetic waves is 0.27 degree at the working frequency;
(2) according to the formula
In order to reflect the phase, the cladding can reduce the distance between the cladding and the metal floor to 0.2504 times of the working wavelength, namely, the profile of the Fabry-Perot resonant cavity antenna is reduced, meanwhile, the cladding has higher reflection amplitude, the gain of the Fabry-Perot resonant cavity antenna is increased, the gain of the Fabry-Perot resonant cavity antenna reaches 12.234dBi, and the gain is increased by 3.8dBi compared with the original microstrip patch without the cladding.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a diagram of the cell structure of the Fabry-Perot cavity antenna cladding;
FIG. 3 is an upper surface of the cladding;
FIG. 4 is a lower surface of the overlay;
FIG. 5 is a graph of reflection amplitude versus electromagnetic wave frequency for a cladding structure;
FIG. 6 is a plot of reflected phase versus electromagnetic wave frequency for a cladding structure;
FIG. 7 is a block diagram of a microstrip patch antenna;
FIG. 8 is a graph of the reflection coefficient of a microstrip patch antenna as a function of electromagnetic waves;
FIG. 9 is a gain plot at the operating frequency of the microstrip patch antenna;
FIG. 10 is a graph of the gain of a developed Fabry-Perot cavity antenna;
FIG. 11 is the developed measured E-plane directivity pattern of a Fabry-Perot cavity antenna;
FIG. 12 is the H-plane measured pattern of the developed Fabry-Perot cavity antenna.
Reference numerals: 1-coating, 2-feed source antenna, 3-metal floor and 4-unit structure.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the Fabry-Perot resonator antenna applied to wireless power transmission according to the present invention has a structure of a cladding structure covering an upper layer of a microstrip patch, the cladding structure is formed by periodically arranging 4 structural units in an arrangement mode of 9 × 9, and the size of the cladding structure is 81mm × 81mm, so that the miniaturization of the antenna is achieved, after the cladding is added, the designed antenna gain reaches 12.234dBi as shown in fig. 10, compared with a feed source microstrip patch antenna, the gain is increased by 3.8dBi, and the effect of increasing the gain is achieved. The feed antenna of the designed Fabry-Perot resonant cavity antenna is a 30-40-1 microstrip patch antenna, the microstrip patch antenna is positioned right below the coating structure, the bottom of the microstrip patch antenna is in contact with a metal floor, the metal floor is positioned at the bottommost layer of the antenna, and the size of the metal floor is the same as that of the coating. The Fabry-Perot resonant cavity antenna applied to wireless power transmission is formed by the three structures, wherein the inside of the antenna is air, and the distance between the coating and the metal floor is 12.95mm, so that the ground section design of the Fabry-Perot resonant cavity antenna is realized.
The antenna effect of the invention is realized based on a coating structure with a double-layer frequency selective surface, and the structural unit is shown in figure 2; 1 is a coating, 2 is a feed source antenna, 3 is a metal floor, and 4 is a unit structure. FIG. 3 is an upper surface of a cladding building block; FIG. 4 is a lower surface of a cladding building block; the upper frequency selective surface of the structural unit is a cross aperture structure, the lower frequency selective surface is a metal patch type, and the units form a coating structure 1 according to the arrangement mode of 9 x 9. The cladding structure plays a role in adjusting the reflection amplitude and the reflection phase of the cladding to the electromagnetic wave by designing a unit structure, as shown in fig. 5, by designing a proper structural unit, the reflection amplitude of the cladding to the electromagnetic wave reaches 0.93 at the working frequency of 5.8GHz, a higher reflection amplitude is maintained, which is beneficial to improving the gain of the Fabry-Perot resonator antenna, and meanwhile, in order to make the reflection phase of the cladding to the electromagnetic wave zero-cross, as shown in fig. 6, the reflection phase of the cladding structure to the electromagnetic wave of 5.8GHz is 0.27 °, which enables the cladding to maintain a lower distance from the metal floor even though the Fabry-Perot resonator antenna has a lower profile.
The feed antenna of the invention is a microstrip patch antenna, and the structure of the feed antenna is shown in figure 7. The size of the metal patch is 16.2mm x 18.5mm, the size of the substrate is 30mm x 40mm x 1mm, the material is Rogers5880, the metal patch is used for exciting electromagnetic waves and providing a feed source for a Fabry-Perot resonant cavity antenna, as shown in figure 8, at 5.8GHz, the reflection coefficient of the microstrip patch antenna reaches the minimum, and the 5.8GHz is the working frequency of the designed microstrip patch antenna, so that the basic requirement of the target of the invention is met, and the 5.8GHz is used as the working frequency of microwave wireless power transmission. As shown in fig. 9, at the 5.8GHz working frequency, the maximum gain of the microstrip patch antenna is 8.4dBi, and the direction of the maximum gain is right above the microstrip patch antenna, which meets the design requirement of the Fabry-Perot resonator antenna, as shown in fig. 10, the antenna with the added cladding structure has increased gain compared with the original microstrip patch antenna, i.e., the designed Fabry-Perot resonator antenna has good gain, as shown in fig. 11 and 12, the antenna of the present invention has better directivity.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (5)
1. A Fabry-Perot resonator antenna applied to wireless power transmission is characterized in that: the antenna comprises a coating, a feed source antenna and a metal floor;
the covering layer is formed by periodically arranging unit structures and is positioned right above the feed source antenna;
the feed source antenna is a microstrip patch antenna with the resonant frequency of 5.8GHz, and the feeding mode is coaxial feeding;
the metal floor is the same size as the cladding and is located at the lowest level of the antenna, directly opposite the cladding.
2. A Fabry-Perot resonator antenna for wireless power transfer application as claimed in claim 1, wherein: the cladding is formed by arranging the unit structures in a 9 x 9 mode, the size is 91mm x 2mm, the gain of the microstrip patch antenna is improved by 3.8dBi through the cladding, the distance between the microstrip patch antenna and the floor is reduced to 0.2504 times of the working wavelength, the reflection amplitude of the cladding on electromagnetic waves at 5.8GHz reaches 0.93, and the reflection phase is 0.27 degrees.
3. A Fabry-Perot resonator antenna for wireless power transfer application as claimed in claim 1, wherein: the unit structure comprises a cross-aperture type frequency selection surface, an ArlonAD260A dielectric substrate with a relative dielectric constant of 2.6 and a metal patch type frequency selection surface, and the size is 9mm by 2 mm;
the upper surface of the unit structure is a cross aperture type frequency selection surface and is formed by two 7.7mm 0.6mm rectangular hollow 9mm metal layers positioned right above the unit structure, and the lower surface of the unit structure is a metal patch type frequency selection surface and is formed by 8.3mm metal layers positioned right below the unit structure;
the middle structure of the unit structure is ArlonAD260A dielectric substrate with 9mm 2 mm.
4. A Fabry-Perot resonator antenna for wireless power transfer application as claimed in claim 1, wherein: the feed source antenna is a microstrip patch antenna, the microstrip patch antenna adopts a coaxial feed mode, the size of a metal patch of the microstrip patch antenna is 16.2mm x 18.5mm, a dielectric layer is a Rogers5880 substrate with the thickness of 30mm x 40mm x 1mm, the reflection coefficient of the microstrip patch antenna at the position of 5.8GHz is the minimum, the maximum gain value is 8.4dBi, and the direction of the maximum gain value is right above the microstrip patch antenna.
5. A Fabry-Perot resonator antenna for wireless power transfer application as claimed in claim 1, wherein: the Fabry-Perot cavity antenna size is 91mm 14.95mm, the gain is maximum 12dBi directly above the Fabry-Perot cavity antenna, and the simulation value is 12.23 dBi.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010975881.4A CN112103629A (en) | 2020-09-16 | 2020-09-16 | Fabry-Perot resonant cavity antenna applied to wireless power transmission |
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| CN202010975881.4A CN112103629A (en) | 2020-09-16 | 2020-09-16 | Fabry-Perot resonant cavity antenna applied to wireless power transmission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471676A (en) * | 2021-05-28 | 2021-10-01 | 西北大学 | Fabry-Perot resonant cavity antenna applied to passive sensing system |
| WO2023050087A1 (en) * | 2021-09-28 | 2023-04-06 | 华为技术有限公司 | Electromagnetic energy focusing device, plane wave generator, and wireless charging transmitter |
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| WO2004093244A2 (en) * | 2003-04-11 | 2004-10-28 | The Penn State Research Foundation | Pixelized frequency selective surfaces for reconfigurable artificial magnetically conducting ground planes |
| CN203826554U (en) * | 2014-05-15 | 2014-09-10 | 重庆大学 | Broadband low profile micro strip paster antenna based on complementary split resonance ring |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2004093244A2 (en) * | 2003-04-11 | 2004-10-28 | The Penn State Research Foundation | Pixelized frequency selective surfaces for reconfigurable artificial magnetically conducting ground planes |
| CN203826554U (en) * | 2014-05-15 | 2014-09-10 | 重庆大学 | Broadband low profile micro strip paster antenna based on complementary split resonance ring |
| CN108521018A (en) * | 2018-03-23 | 2018-09-11 | 西安电子科技大学 | A kind of circular polarisation F-P resonant cavity antenna of the low RCS of high-gain |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113471676A (en) * | 2021-05-28 | 2021-10-01 | 西北大学 | Fabry-Perot resonant cavity antenna applied to passive sensing system |
| CN113471676B (en) * | 2021-05-28 | 2022-06-03 | 西北大学 | Fabry-Perot resonant cavity antenna applied to passive sensing system |
| WO2023050087A1 (en) * | 2021-09-28 | 2023-04-06 | 华为技术有限公司 | Electromagnetic energy focusing device, plane wave generator, and wireless charging transmitter |
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