CN117254243A - Near-field read-write antenna based on bending coplanar waveguide transmission line - Google Patents
Near-field read-write antenna based on bending coplanar waveguide transmission line Download PDFInfo
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- CN117254243A CN117254243A CN202311543916.7A CN202311543916A CN117254243A CN 117254243 A CN117254243 A CN 117254243A CN 202311543916 A CN202311543916 A CN 202311543916A CN 117254243 A CN117254243 A CN 117254243A
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- 210000001503 joint Anatomy 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
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- 238000010276 construction Methods 0.000 abstract description 3
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
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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
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
Abstract
The invention relates to a near-field read-write antenna based on a bent coplanar waveguide transmission line, which is characterized in that a signal bus (2) is arranged based on a main dielectric substrate (1) by using the design idea of the coplanar waveguide, two antenna arms (5) are respectively connected and arranged through a T-shaped power distribution part (3), two ground wires (6) are arranged in a surrounding mode, a feed point (4) and an absorption resistor (7) are combined to realize the construction of the designed near-field read-write antenna, and in the application, the symmetrical design between two parts of structures respectively connected through the T-shaped power distribution part (3) and the impedance matching design under the adjustment of the spacing between the wirings are adopted, so that the magnetic field radiation area corresponding to the antenna is effectively increased, the near-field magnetic field distribution is more uniform, and the read-write success rate of a tag is improved.
Description
Technical Field
The invention relates to a near-field read-write antenna based on a bent coplanar waveguide transmission line, and belongs to the technical field of radio frequency antennas.
Background
The reader antenna is one of the indispensable important components in the RFID system, and the performance of the reader antenna plays a decisive role in the transceiving quality of the whole RFID system. With the development of RFID technology, more and more industries begin to use the technology to manage assets, so that more applications are provided, and more complex functional requirements are put forward one by one. To meet these demands, the design of reader antennas is also continually evolving.
RFID reader antennas can be divided into: far field reader-writer antenna, far, near field reader-writer antenna and near field reader-writer antenna. Representing two different coupling modes respectively, the far field reader antenna and the tag adopt an electric coupling mode, and the near field reader antenna and the tag adopt a magnetic coupling mode. The communication distance between the antenna of the near field reader and the tag is short and is only a few centimeters, but the influence of serial reading can be effectively reduced, so that the antenna has a plurality of application requirements.
The following are common forms of near field reader antennas: loop antennas, two-wire traveling wave antennas, and meander line antennas. 1. The loop antenna is the most used structure in the near field reader-writer, but is limited by the relation of wavelength and phase, the size of the loop antenna is relatively fixed, and the loop antenna is not easy to cascade, so that the read-write area is smaller, and the loop antenna is more suitable for small-area near field read-write. 2. In the double-line traveling wave antenna, a magnetic field distribution with certain intensity can be formed between two parallel opposite transmission lines, and although the traveling wave antenna can realize coverage of a larger area by loading various resonant structures, the traveling wave antenna has lower efficiency and is easy to generate a periodical cavity area, and compared with a use scene of a pure near field, the traveling wave antenna is more suitable for a scene of near-field and far-field coexistence. 3. The folded transmission line antenna passes through the folding of different paths, so that the requirements of different coverage areas can be met. The metal field is loaded, so that the metal-resisting requirement can be met, the far-field gain is low, and the condition of serial reading of labels in different areas can be well avoided.
However, the existing near field reader-writer antenna has limited magnetic field radiation area, and the magnetic field distribution under application has the conditions of local concentration and local sparseness, so that the application problem is brought, namely, the read-write accuracy of the tag is not high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a near-field read-write antenna based on a bent coplanar waveguide transmission line, which is characterized in that a coplanar waveguide structure is designed for feeding, and a magnetic field radiation area is effectively increased through the design of a bent antenna arm, so that the near-field magnetic field distribution is more uniform, and the tag read-write accuracy is improved.
The invention adopts the following technical scheme for solving the technical problems: the invention designs a near-field read-write antenna based on a bent coplanar waveguide transmission line, which comprises a main medium substrate, a signal bus, a T-shaped power distribution part, a feed point, two antenna arms, two ground wires and two absorption resistors, wherein the signal bus is arranged on the upper surface of the main medium substrate in a coplanar manner;
the signal bus is in a straight line posture, the feed point is connected with one end of the signal bus, the other end of the signal bus is in butt joint with the summarizing end of the T-shaped power distribution part, the two distribution ends of the T-shaped power distribution part are positioned on two sides of the straight line where the signal bus is positioned, the two antenna arms, the two ground wires, the two absorption resistors and the two distribution ends of the T-shaped power distribution part are in one-to-one correspondence with each other, the two distribution ends of the T-shaped power distribution part are respectively in butt joint with one end of the corresponding antenna arms, the distribution ends of the antenna arms on the T-shaped power distribution part connected with the antenna arms are positioned on the same side of the straight line where the signal bus is positioned, and the antenna arms are respectively in a nonlinear posture;
the two ground wires are wound along the corresponding antenna arm wires respectively, one end of each ground wire extends to two sides of the signal bus respectively and is connected to the feed point, and each absorption resistor is arranged at the tail end of the corresponding antenna arm and is connected with the corresponding ground wire passing through the position where the absorption resistor is arranged.
As a preferred technical scheme of the invention: defining one side of each distribution end on the T-shaped power distribution part facing the summarizing end as the inner side, and defining one side of each distribution end on the T-shaped power distribution part facing away from the summarizing end as the outer side, wherein each ground wire respectively bypasses the tail end of the corresponding antenna arm and is distributed to two sides of the corresponding distribution end of the connected T-shaped power distribution part along two side routing of the antenna arm, the end part of each ground wire positioned at the inner side of the corresponding distribution end is respectively continuously distributed to two sides of a feed point along the side routing of the signal bus, the end parts of the two ground wires respectively positioned at the two sides of the feed point are mutually connected and are connected with the feed point, the end parts of the two ground wires respectively positioned at the outer sides of the corresponding distribution end are not mutually connected, one end of each absorption resistor is respectively connected with the tail end of the corresponding antenna arm, and the other end of each absorption resistor is respectively connected with the corresponding ground wire passing through the set position.
As a preferred technical scheme of the invention: based on the distance between the two sides of the signal bus and the ground wire, the distance between the two sides of each antenna arm and the ground wire is a, the distance between the two sides of the preset length section from the end part connected with the feed point on the signal bus and the ground wire is smaller than a, and therefore impedance matching is achieved on the feed point by the ground wires at the two sides of the position; the distance between the ground wires facing the two sides of the reverse preset length section from the tail end of each antenna arm is smaller than a, and impedance matching is realized on the corresponding absorption resistors by the ground wires at the two sides of the position of each antenna arm; the distance between the two sides of each distribution end of the T-shaped power distribution part and the ground wire facing the distribution end is smaller than a, so that the ground wires at the two sides of the T-shaped power distribution part are connected with the signal bus and the antenna arm to realize impedance matching.
As a preferred technical scheme of the invention: each antenna arm is respectively arranged in an S-shaped wiring or a spiral wiring.
As a preferred technical scheme of the invention: the structures on two sides of the straight line where the signal bus is located are axisymmetrically distributed.
As a preferred technical scheme of the invention: the device also comprises a signal reflecting layer, wherein the signal reflecting layer is arranged on the lower surface of the main medium substrate or below the main medium substrate at a position which is preset to be larger than 0 space, and the signal reflecting layer is parallel to the main medium substrate.
As a preferred technical scheme of the invention: the signal reflection layer comprises a secondary medium substrate and a metal layer arranged on at least one surface of the secondary medium substrate.
Compared with the prior art, the near-field read-write antenna based on the bent coplanar waveguide transmission line has the following technical effects:
the invention designs a near-field read-write antenna based on a bent coplanar waveguide transmission line, based on a main medium substrate, a signal bus is distributed based on the design idea of the coplanar waveguide, two antenna arms are respectively connected and distributed through a T-shaped power distribution piece, two ground wires are distributed in a surrounding mode, a feed point and an absorption resistor are combined to realize the construction of the designed near-field read-write antenna, and in application, the symmetrical design between two parts of structures respectively connected through the T-shaped power distribution piece and the impedance matching design under the adjustment of the spacing between wirings are adopted, so that the magnetic field radiation area corresponding to the antenna is effectively increased, the near-field magnetic field distribution is more uniform, and the read-write success rate of a tag is improved.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of a near-field read-write antenna based on a folded coplanar waveguide transmission line according to the present invention;
FIG. 2 is a schematic top view of a system of the present invention for designing a near field read/write antenna based on a folded coplanar waveguide transmission line;
FIG. 3 is a diagram of the |S under the application of the present invention 11 Schematic of the results;
FIG. 4 is a schematic diagram of magnetic field strength of near field regions corresponding to different heights for a design application of the present invention;
FIG. 5 is a schematic diagram of the magnetic field strength corresponding to the near field region in the application of the present invention;
FIG. 6 shows the distribution of electric fields corresponding to different heights in the application of the present invention;
fig. 7 is a far field pattern of an antenna in accordance with the design application of the present invention.
The antenna comprises a main medium substrate 1, a signal bus 2, a T-shaped power distribution part 3, a feed point 4, an antenna arm 5, a ground wire 6, an absorption resistor 7, a signal reflection layer 8 and an insulating support rod 9.
Description of the embodiments
The following describes the embodiments of the present invention in further detail with reference to the drawings.
In practical application, as shown in fig. 1 and 2, the invention specifically designs a near-field read-write antenna based on a bent coplanar waveguide transmission line, which comprises a main dielectric substrate (FR 4) 1, a signal bus 2 arranged on the upper surface of the main dielectric substrate (FR 4) 1 in a coplanar manner, a T-shaped power distribution element 3, a feed point 4, two antenna arms 5, two ground wires 6 and two absorption resistors 7.
The signal bus 2 is in a straight line posture, the feeding point 4 is connected with one end of the signal bus 2, the other end of the signal bus 2 is in butt joint with the gathering end of the T-shaped power distribution part 3, the two distribution ends of the T-shaped power distribution part 3 are positioned at two sides of the straight line where the signal bus 2 is positioned, the two antenna arms 5, the two ground wires 6, the two absorption resistors 7 and the two distribution ends of the T-shaped power distribution part 3 are in one-to-one correspondence with each other, the two distribution ends of the T-shaped power distribution part 3 are respectively in butt joint with one end of the corresponding antenna arms 5, each antenna arm 5 is respectively in a nonlinear posture with the distribution end of the T-shaped power distribution part 3 connected with the antenna arms 5 on the same side of the straight line where the signal bus 2 is positioned, namely, the power distribution effect is realized by utilizing the T-shaped power distribution part 3, the signal is divided into two branches with the same phase amplitude, and the two arms of a near field read-write antenna are excited, namely the two antenna arms 5.
Two ground wires 6 are wound along the corresponding antenna arms 5, one ends of the ground wires 6 extend to two sides of the signal bus 2 and are connected to the feed point 4, and each absorption resistor 7 is arranged at the tail end of the corresponding antenna arm 5 and is connected with the corresponding ground wire 6 passing through the arranged position.
Regarding the design of winding the ground wires 6 along the corresponding antenna arms 5 in the scheme, in practical applications, as shown in fig. 1 and 2, one side of each distribution end facing the collecting end on the T-shaped power distribution unit 3 is defined as the inner side, one side of each distribution end facing away from the collecting end on the T-shaped power distribution unit 3 is defined as the outer side, each ground wire 6 bypasses the corresponding antenna arm 5 end, is routed along two sides of the antenna arm 5 to two sides of the corresponding distribution end of the connected T-shaped power distribution unit 3, and the end of each ground wire 6 located at the inner side of the corresponding distribution end continues to be routed along the side of the signal bus 2 to two sides of the feed point 4, the end of each ground wire 6 located at two sides of the feed point 4 is connected with each other and is connected with the feed point 4, the end of each ground wire 6 located at the outer side of the corresponding distribution end is not connected with each other, one end of each absorption resistor 7 is connected with the end of the corresponding antenna arm 5, and the other end of each absorption resistor 7 is connected with the corresponding ground wire 6 passing through the set position, namely, the absorption resistor 7 absorbs redundant energy, in practical applications, namely, the absorption resistor 7 is used as the absorption resistor 50 ohm resistor, and the far-field gain string is suppressed.
In practical application, the near-field read-write antenna designed by the above technical scheme considers impedance matching design, specifically, based on that the distance between two sides of the signal bus 2 and the distance between two sides of each antenna arm 5 and the distance between two sides of the ground wire 6 are respectively a, the distance between two sides of the preset length section from the end connected with the feed point 4 on the signal bus 2 and the distance between the two sides of the ground wire 6 are smaller than a, and therefore impedance matching is realized on the feed point 4 by the ground wires 6 at two sides of the position; the distance between the ground wires 6 facing the two opposite sides of the reverse preset length section from the tail end of each antenna arm 5 is smaller than a, and impedance matching is realized on the corresponding absorption resistor 7 by the ground wires 6 at the two sides of the position of each antenna arm 5; the distance between the two sides of each distribution end of the T-shaped power distribution part 3 and the ground wire 6 facing the distribution end is smaller than a, so that the ground wires 6 on the two sides of the position realize impedance matching on the connection between the signal bus 2 and the antenna arm 5. With regard to the pitch design here, the impedance is correspondingly reduced when the pitch is smaller than a, i.e. impedance matching at each position here is achieved.
In practical application, as shown in fig. 1 and 2, the near-field read-write antenna with the above design can be specifically designed that each antenna arm 5 is respectively arranged in an S-shaped wiring or a spiral wiring, and under the arrangement of the S-shaped wiring, the reciprocating lengths of the antenna arms 5 are the same, so that the S-shaped wirings with equal length in a reciprocating period are formed, the antenna paths can be increased, the radiation density is increased, the near-field magnetic field distribution is more uniform, the antenna radiation areas are more densely distributed, and the more uniform near-field magnetic field distribution can be obtained; in the above design structure, further in application, the two side structures of the straight line where the signal bus 2 is located are axisymmetrically distributed with each other, that is, as shown in fig. 1 and fig. 2, the two part structures respectively connected and distributed by the T-shaped power distribution member 3 are axisymmetrically distributed with respect to the straight line where the signal bus 2 is located.
In practical application, in the design of constructing each wiring layout based on the main dielectric substrate (FR 4) 1, as shown in fig. 1 and 2, a signal reflection layer 8 is added for the antenna to transmit and receive signals, and the signal reflection layer 8 is disposed on the lower surface of the main dielectric substrate (FR 4) 1 or at a position below the main dielectric substrate (FR 4) 1, which is preset to be greater than 0 space, and the signal reflection layer 8 is parallel to the main dielectric substrate (FR 4) 1, that is, the signal transmission direction and the signal receiving direction of the designed near-field read-write antenna are limited by the reflection of the signal reflection layer 8, so that more specific signal radiation direction is realized, the working efficiency of transmitting and receiving signals in the direction is improved, and the anti-metal capability of the antenna is improved.
In practical applications, the signal reflecting layer 8 specifically includes a secondary dielectric substrate and a metal layer disposed on at least one surface of the secondary dielectric substrate, so as to implement the construction of the signal reflecting layer 8.
The designed near-field read-write antenna is applied to practice, the traveling wave antenna structure 5 based on the bent coplanar waveguide can effectively increase the bandwidth, S11 is smaller than-10 dB between 890 MHz and 940MHz, and the RFID ultra-high frequency band 902-928MHz can be completely covered. In addition, in the application, the T-shaped power distribution part 3 is utilized to realize power distribution, so that the two antenna arms 5 can be excited simultaneously, and the coverage range of the near-field reader-writer is increased. The size of the dielectric substrate is 166 mm by 200mm, the size of the antenna is 157 mm by 192mm, the intensity of the near field magnetic field is increased and distributed more uniformly by using a bending line mode, and stronger near field magnetic field radiation is arranged at the positions 15mm, 30mm and 45mm from the surface of the antenna.
In practical application, as shown in FIG. 3, it is illustrated that the near field read-write antenna designed by the present invention has good matching (|S) in the general FCC frequency band (902-928 MHz) 11 |<-10 dB), and as shown in fig. 4, shows the distribution of in-plane magnetic field of 15mm, 30mm, 45mm from the antenna surface in the application of the near field read-write antenna of the present invention, wherein the in-plane magnetic field strength is strong (the light area magnetic field strength is greater than-10 a/m at h=15 mm from the antenna surface] dB ) And the distribution is relatively uniform, and the effective reading of the labels can be realized in the area.
In practical application, the higher the characteristic impedance of the coplanar waveguide transmission line is, the higher the near-field radiation intensity is, so that the waveguide transmission line with the characteristic impedance of 140 ohms is designed to be used as a near-field radiation antenna. As shown in fig. 5, the profile of the magnetic field in the side view is shown, the magnetic field gradually decreases with increasing height from the antenna surface, but the field intensity distribution at the same height is more uniform, and as shown in fig. 6, the field distribution at 15mm, 30mm, 45mm from the antenna surface is shown, wherein the field intensity is stronger at the center of the antenna. In addition, as shown in fig. 7, the far field pattern of the antenna is shown, the antenna end is connected with a matching load, which is beneficial to the requirement of magnetic field radiation in the near field and low radiation gain in the far field region, the residual energy is absorbed by the 50 ohm load connected with the end, and the peak gain in the far field at 915MHz is less than-16.7 dBi, which can greatly inhibit the serial reading condition of the reader-writer.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. A near field read-write antenna based on a bending coplanar waveguide transmission line is characterized in that: the antenna comprises a main medium substrate (1), a signal bus (2) which is arranged on the upper surface of the main medium substrate (1) in a coplanar manner, a T-shaped power distribution part (3), a feed point (4), two antenna arms (5), two ground wires (6) and two absorption resistors (7);
the signal bus (2) is in a straight line posture, the feeding point (4) is connected with one end of the signal bus (2), the other end of the signal bus (2) is in butt joint with the gathering end of the T-shaped power distribution part (3), the two distribution ends of the T-shaped power distribution part (3) are positioned on two sides of the straight line where the signal bus (2) is positioned, the two antenna arms (5), the two ground wires (6), the two absorption resistors (7) and the two distribution ends of the T-shaped power distribution part (3) are in one-to-one correspondence with each other, the two distribution ends of the T-shaped power distribution part (3) are respectively in butt joint with one end of the corresponding antenna arm (5), the antenna arms (5) are respectively positioned on the same side of the straight line where the signal bus (2) is positioned with the distribution ends of the T-shaped power distribution part (3) connected with the antenna arms, and the antenna arms (5) are respectively in a nonlinear posture;
two ground wires (6) are wound along the corresponding antenna arms (5) respectively, one end of each ground wire (6) extends to two sides of the signal bus (2) respectively and is connected to the feed point (4), and each absorption resistor (7) is arranged at the tail end of the corresponding antenna arm (5) respectively and is connected with the corresponding ground wire (6) passing through the arranged position of the absorption resistor.
2. The near field read-write antenna based on a folded coplanar waveguide transmission line according to claim 1, wherein: defining one side of each distribution end face of the T-shaped power distribution part (3) to be the inner side, and defining one side of each distribution end face of the T-shaped power distribution part (3) to be the outer side, opposite to the collection end, of each distribution end, each ground wire (6) respectively bypasses the tail end of the corresponding antenna arm (5), is distributed to two sides of the corresponding distribution end of the connected T-shaped power distribution part (3) along two side routing lines of the antenna arm (5), the end part of each ground wire (6) positioned at the inner side of the corresponding distribution end respectively continues to be distributed to two sides of the feed point (4) along the side routing line of the signal bus (2), the end parts of the two ground wires (6) respectively positioned at the two sides of the feed point (4) are mutually connected and are connected with the feed point (4), the end parts of the two ground wires (6) respectively positioned at the outer sides of the corresponding distribution ends are not mutually connected, one end of each absorption resistor (7) is respectively connected with the tail end of the corresponding antenna arm (5), and the other end of each absorption resistor (7) is respectively connected with the corresponding ground wire (6) passing through the set position.
3. The near field read-write antenna based on a folded coplanar waveguide transmission line according to claim 2, wherein: based on the distance between two sides of the signal bus (2) and the ground wire (6), the distance between two sides of each antenna arm (5) and the ground wire (6) is a, the distance between two sides of the preset length section from the end part connected with the feed point (4) on the signal bus (2) and the ground wire (6) is smaller than a, and therefore impedance matching is achieved on the feed point (4) by the ground wires (6) at two sides of the position; the distance between the ground wires (6) facing the two sides of the reverse preset length section from the tail end of each antenna arm (5) is smaller than a, and the ground wires (6) on the two sides of the position of each antenna arm (5) realize impedance matching on the corresponding absorption resistor (7); the distance between the two sides of each distribution end on the T-shaped power distribution part (3) and the ground wire (6) facing the distribution end is smaller than a, so that the ground wires (6) on the two sides of the position realize impedance matching on the connection between the signal bus (2) and the antenna arm (5).
4. The near field read-write antenna based on a folded coplanar waveguide transmission line according to claim 1, wherein: each antenna arm (5) is respectively arranged in an S-shaped wiring way or a spiral wiring way.
5. The near field read-write antenna based on a folded coplanar waveguide transmission line according to claim 4, wherein: the structures on two sides of the straight line where the signal bus (2) is located are axisymmetrically distributed.
6. A near field read-write antenna based on a folded coplanar waveguide transmission line according to any one of claims 1 to 5, wherein: the device also comprises a signal reflecting layer (8), wherein the signal reflecting layer (8) is arranged on the lower surface of the main medium substrate (1) or below the main medium substrate (1) at a position which is preset to be larger than 0 interval, and the signal reflecting layer (8) is parallel to the main medium substrate (1).
7. The near field read-write antenna based on a folded coplanar waveguide transmission line according to claim 6, wherein: the signal reflection layer (8) comprises a secondary dielectric substrate and a metal layer arranged on at least one surface of the secondary dielectric substrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311543916.7A CN117254243B (en) | 2023-11-20 | 2023-11-20 | Near-field read-write antenna based on bending coplanar waveguide transmission line |
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| CN202311543916.7A CN117254243B (en) | 2023-11-20 | 2023-11-20 | Near-field read-write antenna based on bending coplanar waveguide transmission line |
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| CN117254243B CN117254243B (en) | 2024-01-19 |
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|---|---|---|---|---|
| KR20150135557A (en) * | 2014-05-21 | 2015-12-03 | 이승호 | near fied high gain antenna for mobile communication |
| CN206163714U (en) * | 2016-10-17 | 2017-05-10 | 河南师范大学 | Dual -band antenna |
| CN110661089A (en) * | 2018-06-29 | 2020-01-07 | 深圳市小麦物联科技有限公司 | High-gain narrow-beam circularly polarized antenna based on metal film array |
| CN214043980U (en) * | 2020-12-16 | 2021-08-24 | 深圳市鸿陆技术有限公司 | RFID antenna and RFID reader |
| US20210320529A1 (en) * | 2020-04-13 | 2021-10-14 | Energous Corporation | Wireless-power transmitting device for creating a uniform near-field charging area |
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2023
- 2023-11-20 CN CN202311543916.7A patent/CN117254243B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150135557A (en) * | 2014-05-21 | 2015-12-03 | 이승호 | near fied high gain antenna for mobile communication |
| CN206163714U (en) * | 2016-10-17 | 2017-05-10 | 河南师范大学 | Dual -band antenna |
| CN110661089A (en) * | 2018-06-29 | 2020-01-07 | 深圳市小麦物联科技有限公司 | High-gain narrow-beam circularly polarized antenna based on metal film array |
| US20210320529A1 (en) * | 2020-04-13 | 2021-10-14 | Energous Corporation | Wireless-power transmitting device for creating a uniform near-field charging area |
| CN214043980U (en) * | 2020-12-16 | 2021-08-24 | 深圳市鸿陆技术有限公司 | RFID antenna and RFID reader |
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