CN114094324A - Integrated waveguide antenna applied to RFID - Google Patents
Integrated waveguide antenna applied to RFID Download PDFInfo
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- CN114094324A CN114094324A CN202111268678.4A CN202111268678A CN114094324A CN 114094324 A CN114094324 A CN 114094324A CN 202111268678 A CN202111268678 A CN 202111268678A CN 114094324 A CN114094324 A CN 114094324A
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- integrated waveguide
- waveguide antenna
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- rfid
- metal patch
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- 239000002184 metal Substances 0.000 claims abstract description 52
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 230000010354 integration Effects 0.000 claims abstract description 7
- 239000002356 single layer Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- H01Q1/36—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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
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- Waveguide Aerials (AREA)
Abstract
本发明公开了一种应用于RFID的集成波导天线，包括介质基板，介质基板的顶部刻蚀有四个的金属贴片单元，四个金属贴片单元共用顶点相邻放置，金属贴片单元上设置有馈电端口，介质板的底部为全覆盖金属地板。在保证相近天线之间隔离度的基础上，以减小基片集成波导天线的尺寸为目的，提高了基片集成波导天线的集成度。
The invention discloses an integrated waveguide antenna applied to RFID, comprising a dielectric substrate, four metal patch units are etched on the top of the dielectric substrate, the four metal patch units share a vertex and are placed adjacent to each other, and the metal patch unit is on the A power feeding port is provided, and the bottom of the dielectric board is a fully covered metal floor. On the basis of ensuring the isolation degree between adjacent antennas, the integration degree of the substrate integrated waveguide antenna is improved for the purpose of reducing the size of the substrate integrated waveguide antenna.
Description
Technical Field
The invention belongs to the technical field of waveguide antennas, and relates to a substrate integrated waveguide antenna applied to RFID.
Background
With the rapid development of the RFID technology, the design and application of the RFID antenna have made great progress, and particularly, the RFID antenna capable of operating in multiple frequency bands has been developed more rapidly in the commercial field. Many researchers have made many results on the research of the frequency bands such as the UHF band (0.88GHz), the S band (2.45GHz and 3.5GHz) and the C band (5.8 GHz). On the other hand, due to the size limitation, it is necessary to realize multi-frequency and miniaturized design on the same antenna at the same time, which presents no small challenge to researchers.
Substrate integrated waveguide the advent of Substrate Integrated Waveguide (SIW) has met the need for low profile antennas that are simple in construction, have high Q and directivity, and are convenient for integration with systems.
Disclosure of Invention
The invention aims to provide a substrate integrated waveguide antenna applied to RFID (radio frequency identification), which aims to reduce the size of the substrate integrated waveguide antenna and improve the integration level of the substrate integrated waveguide antenna on the basis of ensuring the isolation between adjacent antennas.
The invention adopts the technical scheme that the integrated waveguide antenna applied to the RFID comprises a dielectric substrate, wherein four metal patch units are etched on the top of the dielectric substrate, the four metal patch units share the vertex and are adjacently placed, a feed port is arranged on each metal patch unit, and a full-coverage metal floor is arranged at the bottom of a dielectric plate.
The invention is also characterized in that:
and a strip gap is etched on each metal patch unit.
The sizes of the four metal patch units are different.
Two adjacent side surfaces of each metal patch are provided with metalized circular through holes, the adjacent patches share the metal through holes, and the metal through holes are connected with the metal floor.
The four metal patch units are four independent adjustable quarter-mode substrate integrated waveguide units.
The dielectric substrate is a single-layer F4B dielectric plate with the dielectric constant of 2.65, and the working bandwidths of the four metal patch units are 0.88/2.45/3.5GHz and 5.8 GHz.
The invention has the beneficial effects that: the integrated waveguide antenna applied to the RFID aims to reduce the size of the substrate integrated waveguide antenna and improve the integration level of the substrate integrated waveguide antenna on the basis of ensuring the isolation between adjacent antennas. The integration level of the full-mode substrate integrated waveguide antenna is improved, and the size of the full-mode substrate integrated waveguide antenna is reduced. The metal through holes are shared among the metal patch units, and the overall size of the antenna is further reduced on the basis of ensuring coupling among the units. Strip-shaped gaps are etched on the unit patches, so that the bandwidth is further widened, and the working bandwidth is 0.88/2.45/3.5GHz and 5.8GHz, namely the RFID application frequency band. Compared with the traditional full-mode substrate integrated waveguide antenna, the size of the antenna can be reduced by 75%.
Drawings
FIG. 1 is a schematic diagram of an integrated waveguide antenna for RFID applications according to the present invention;
FIG. 2 is a graph showing the variation of S parameter with frequency for an integrated waveguide antenna for RFID application in accordance with the present invention;
FIG. 3 is a graph of the gain of a four-frequency antenna of an integrated waveguide antenna for RFID application according to the present invention;
FIG. 4 is a plane directional diagram of a quad-band antenna at 0.88GHz for an integrated waveguide antenna for RFID application of the present invention;
FIG. 5 is a planar pattern of a quad-band antenna at 2.45GHz for an integrated waveguide antenna for RFID applications according to the present invention;
FIG. 6 is a planar pattern of a quad-band antenna at 3.5GHz according to an integrated waveguide antenna for RFID application of the present invention;
fig. 7 is a plane directional diagram of a quad-band antenna at 5.8GHz in an integrated waveguide antenna for RFID application according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to an integrated waveguide antenna applied to RFID (radio frequency identification), which comprises a dielectric substrate, wherein four metal patch units are etched on the top of the dielectric substrate, the four metal patch units share vertexes and are adjacently placed, a feed port is arranged on each metal patch unit, and a full-coverage metal floor is arranged at the bottom of a dielectric plate. And a strip gap is etched on each metal patch unit. The sizes of the four metal patch units are different. Two adjacent side surfaces of each metal patch are provided with metalized circular through holes, the adjacent patches share the metal through holes, and the metal through holes are connected with the metal floor. The four metal patch units are four independently adjustable quarter-mode substrate integrated waveguide (QMSIW) units. The dielectric substrate is a single-layer F4B dielectric plate with the dielectric constant of 2.65, and the working bandwidths of the four metal patch units are 0.88/2.45/3.5GHz and 5.8 GHz.
The invention relates to an integrated waveguide antenna applied to RFID (radio frequency identification device). A single-layer F4B dielectric plate with the dielectric constant of 2.65, the thickness H and the size L of the dielectric plate is adopted as the dielectric plate1X W, four back-to-back placed metal patch units are positioned on the top surface of the dielectric slab, the metal floor is positioned on the bottom surface of the dielectric slab, and the diameter D of the metal floor issiwAt a distance of PsiwThe metal through hole is connected with the patch and the floor. The integrated waveguide antenna applied to the RFID adopts coaxial feed, and has four feed ports which are respectively marked as a port 1, a port 2, a port 3 and a port 4 according to the sequence of the sizes of patches.
The invention relates to an integrated waveguide antenna applied to RFID (radio frequency identification), which can effectively reduce the size of the antenna, but still has a plurality of inherent limitations, wherein the most prominent problem is the narrow working bandwidth, and in order to improve the working bandwidth, a strip slot is etched on a metal patch unit, and a quasi-eighth mode is introduced. Therefore, the purpose of increasing the working bandwidth can be achieved by overlapping the two modes of the antenna, and the method for improving the working bandwidth by using the mode overlapping is also one of the commonly used means of the broadband antenna. The integrated waveguide antenna applied to the RFID is composed of four independently adjustable metal patch units, and each metal patch unit can be regarded as a quarter-mode substrate integrated waveguide antenna.
Fig. 2 shows a simulation test diagram of the variation of the S parameter with the frequency, and it can be seen from the diagram that the simulated operating bandwidths of the antenna array are respectively 60MHz (0.85GHz-0.91GHz), 90MHz (2.43GHz-2.52GHz), 260MHz (3.38GHz-3.64GHz), and 450MHz (5.5GHz-5.95GHz), while the measured bandwidths are slightly narrower than those of the simulation, respectively 45MHz (0.855GHz-0.9GHz), 90MHz (2.42GHz-2.51GHz), 190MHz (3.39GHz-3.58GHz), and 420MHz (5.64GHz-6.06GHz), and the small difference between the measured bandwidth and the simulated bandwidth may be caused by the influence of the solder joint and the processing error. Coupling (S) between adjacent cells within the operating frequency band12、S13、S14、S23、S24、S34) And if the number of the metal through holes is larger than 20dB, the mutual influence among the similar units is small, the overall performance of the antenna cannot be reduced after array formation, and the feasibility of the design of the common metal through holes is verified. As can be seen from fig. 2, by introducing the additional mode, there are two resonance points in each frequency band, and by overlapping the resonance modes, the operating bandwidth of the antenna is significantly improved.
The invention relates to an integrated waveguide antenna gain simulation actual measurement diagram applied to RFID (radio frequency identification device) along with the change of frequency, wherein the antenna gain is gradually increased along with the increase of the frequency, and in each working frequency band, an antenna unit maintains more stable gain, so that the actual applicability of the antenna is increased. Fig. 4-7 show the simulation and actual measurement curves of the plane directional diagram of the integrated waveguide antenna applied to RFID of the present invention when operating at 0.88/2.45/3.5/5.8GHz, respectively, which is similar to the conventional substrate integrated waveguide antenna, and the integrated waveguide antenna applied to RFID of the present invention maintains a higher front-to-back ratio, has less backward radiation and less energy loss. The maximum radiation direction of the antenna is basically in the axial direction of the antenna, which shows that the metallized through holes are effective for realizing energy isolation between adjacent antenna elements. By selecting the parameters of the proper metalized through holes, an electric wall can be formed on the boundary of the adjacent antenna units, so that the radiation energy is concentrated in the unit, the loss of the energy is avoided, the influence of the unit on other three units is reduced, the coupling between the adjacent antenna units is reduced, and the purpose of independent regulation is finally achieved.
The integrated waveguide antenna applied to the RFID aims to reduce the size of the substrate integrated waveguide antenna on the basis of ensuring the isolation between adjacent antennas, so that the integration level of the substrate integrated waveguide antenna is improved. The metal holes are shared among the metal patch units, and the overall size of the antenna is further reduced on the basis of ensuring coupling among the units. Strip-shaped gaps are etched on the unit patches, so that the bandwidth is further widened, and the working bandwidth is 0.88/2.45/3.5GHz and 5.8GHz, namely the RFID application frequency band. Compared with the traditional full-mode substrate integrated waveguide antenna, the size of the antenna can be reduced by 75%.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111268678.4A CN114094324A (en) | 2021-10-29 | 2021-10-29 | Integrated waveguide antenna applied to RFID |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111268678.4A CN114094324A (en) | 2021-10-29 | 2021-10-29 | Integrated waveguide antenna applied to RFID |
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| CN114094324A true CN114094324A (en) | 2022-02-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548677A (en) * | 2022-09-23 | 2022-12-30 | 西安理工大学 | Miniaturized four-feed self-multiplexing antenna based on substrate integrated waveguide |
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2021
- 2021-10-29 CN CN202111268678.4A patent/CN114094324A/en active Pending
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115548677A (en) * | 2022-09-23 | 2022-12-30 | 西安理工大学 | Miniaturized four-feed self-multiplexing antenna based on substrate integrated waveguide |
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