CN214153176U - Ultrahigh frequency high-gain double dipole tag antenna with low profile - Google Patents
Ultrahigh frequency high-gain double dipole tag antenna with low profile Download PDFInfo
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- CN214153176U CN214153176U CN202023270349.7U CN202023270349U CN214153176U CN 214153176 U CN214153176 U CN 214153176U CN 202023270349 U CN202023270349 U CN 202023270349U CN 214153176 U CN214153176 U CN 214153176U
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Abstract
The utility model provides a two dipole tag antenna of hyperfrequency high gain of low section adopts the rectangle FR4 medium plane dielectric slab of individual layer to form the antenna. The upper surfaces of the plane dielectric plates are respectively provided with metal dipole antennas, and the middle parts of the metal dipole antennas are in an open arc shape. The middle part of the upper surface of the planar dielectric plate is provided with a radio frequency identification chip antenna interface which is connected with an annular coil. The metal dipole antennas at the bottom layer and the top layer are coupled with the single-opening annular feed ring through the single-opening annular coupling structure and the double-opening annular coupling structure in the middle of the planar dielectric plate, so that good matching and large bandwidth with a 915MHz ultrahigh frequency radio frequency identification chip can be achieved. Meanwhile, by adjusting the current path, the radiation electric fields on the two metal dipole antenna arms at the bottom layer of the planar dielectric slab and the two metal dipole antenna arms at the bottom layer of the top layer are made to be longer, so that the tag antenna has high gain with an extremely low section and length, and the bandwidth can reach 550 MHz.
Description
Technical Field
The utility model relates to a radio frequency identification technical field especially relates to a hyperfrequency high gain dipole tag antenna of low section.
Background
Radio Frequency Identification (RFID) is one of automatic Identification technologies, and performs contactless bidirectional data communication in a Radio Frequency manner, and reads and writes a recording medium (an electronic tag or a Radio Frequency card) in a Radio Frequency manner, thereby achieving the purpose of identifying a target and exchanging data, and is considered to be one of the most promising information technologies in the 21 st century.
The radio frequency identification technology realizes non-contact two-way communication by combining radio wave non-contact quick information exchange and storage technology and wireless communication with data access technology and then connecting a database system, thereby achieving the aim of identification.
As a key technology of data interaction in the internet of things, the RFID technology is widely used for marking and identifying objects at present. The current development direction of the RFID mainly comprises remote data identification communication, identification communication in a complex environment and passive active sensing identification communication.
In the RFID system, an antenna serving as an electromagnetic wave transmitting/receiving function plays a significant role. For a tag to be placed on an article for label identification, the tag antenna usually needs to be impedance matched with the rfid chip. However, the impedance of rfid chips is typically not the standard 50 ohms, which increases the difficulty of antenna matching designs. Most of the currently used tag antennas are dipole meander line antennas. However, with the advent of the internet of things era, the application of the RFID is deepened, and urgent needs are provided for a tag antenna which is high in gain, good in stability and easy to expand and design. The metal dipole antenna is favored by people as the simplest antenna, and the gain of a single metal dipole antenna is about 2.14dB, which is difficult to meet the requirements of people. The antenna gain can be improved by adding a reflecting plate behind the antenna, but the reflecting plate needs to be a quarter wavelength away from the antenna. For RFID antennas operating at ultra high frequencies, the thickness will reach 10cm and above. In recent years, the academic community researches on the electromagnetic band gap structure can improve the gain of the antenna and reduce the distance between the reflecting plate and the antenna, but the structure and the manufacturing process are relatively complex.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings in the prior art, an object of the present invention is to provide a low-profile ultrahigh frequency high-gain dual dipole tag antenna, which is used for solving the problems of high gain, low profile and impedance adjustment of the RFID tag antenna in the ultrahigh frequency band in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a low-profile ultra-high frequency high-gain double dipole tag antenna, which comprises: the planar dielectric plate comprises a planar dielectric plate, and a single-opening annular coupling structure, a single-opening annular feed ring and a double-opening annular coupling structure which are positioned on the upper surface of the planar dielectric plate;
the single-opening annular feed ring is embedded in the single-opening annular coupling structure, a first distance exists between the single-opening annular feed ring and the single-opening annular coupling structure, and the distance value of the first distance can be adjusted;
the double-opening annular coupling structure is embedded in the single-opening annular coupling structure, a second distance exists between the double-opening annular coupling structure and the single-opening annular coupling structure, and the distance value of the second distance can be adjusted;
and the upper surface of the planar dielectric plate is also provided with two groups of metal dipole antennas which are parallel to each other, wherein one group of metal dipole antennas is connected with the single-opening annular coupling structure, and the other group of metal dipole antennas is connected with the double-opening annular coupling structure.
Optionally, each group of metal dipole antennas comprises two metal dipole antenna arms;
the single-opening annular coupling structure is provided with a first opening, and two sides of the first opening are respectively connected with a metal dipole antenna arm;
the double-opening annular coupling structure is provided with a second opening and a third opening, two parallel metal strips extend from two sides of the second opening, and each metal strip is connected with one metal dipole antenna arm; the opening direction of the third opening is close to or overlapped with the opening direction of the first opening, or the opening direction of the third opening is close to or overlapped with the opening direction of the single-opening annular feed ring.
Optionally, the single-aperture annular feed ring, the single-aperture annular coupling structure, and the two metal dipole antenna arms connected to the single-aperture annular coupling structure form a layer of structure on the upper surface of the planar dielectric slab, and the layer of structure is denoted as a top layer structure;
the double-opening annular coupling structure and the two metal dipole antenna arms connected with the double-opening annular coupling structure form a layer of structure on the upper surface of the planar dielectric plate, and the structure is marked as a bottom layer structure; and, the top layer structure is located on the bottom layer structure.
Optionally, the single-aperture annular feed ring has a fourth aperture, an opening of the fourth aperture is connected with two parallel square metal strips, and the two parallel square metal strips and the single-aperture annular feed ring are matched to form a welding port of the radio frequency identification chip.
Optionally, the distance value of the first pitch is smaller than the distance value of the second pitch; the first interval is 0.5mm, and the second interval is 0.65 mm.
Optionally, the planar dielectric slab is FR 4; the dielectric constant of the planar dielectric plate is 4.4, the thickness of the planar dielectric plate is 1mm, the length of the planar dielectric plate is 196mm, and the width of the planar dielectric plate is 28.25 mm.
Optionally, the inner circle radius of the single-opening annular coupling structure is 8.5mm, and the outer circle radius is 10.5 mm; the inner circle radius of the double-opening annular coupling structure is 4.92mm, and the outer circle radius of the double-opening annular coupling structure is 5.85 mm.
Optionally, the inner circle radius of the single-aperture annular feed ring is 6.5mm, and the outer circle radius of the single-aperture annular feed ring is 8 mm.
Optionally, the aperture width of the single aperture annular feeding ring is 1.6 mm; the opening width of the double-opening annular coupling structure is 4 mm; the opening width of the single-opening annular coupling structure is 4 mm.
Optionally, the metal dipole antenna is formed from a metal copper sheet; any metal dipole antenna connected with the single-opening annular coupling structure is 95.5mm long and 2mm wide; and any metal dipole antenna arm connected with the double-opening annular coupling structure is 95mm long and 2.25mm wide.
As described above, the utility model provides a hyperfrequency high-gain dipole tag antenna of low section has following beneficial effect: the utility model adopts the annular nested co-feeding mode, which increases the bandwidth and makes the working performance more stable; the antenna in the utility model is composed of two metal dipole antennas, and can realize high gain under the condition of low profile; the utility model provides an annular feed structure impedance easily adjusts, makes its radio frequency identification chip with various impedances match easily. The utility model can increase the inductive reactance by increasing the width of the coupling feed ring or the annular feed structure; by enlarging the distance between the coupling feed ring and the annular feed structure, the capacitive reactance can be increased.
Drawings
Fig. 1 is a schematic view of an antenna main body of the present invention;
FIG. 2 is a schematic diagram of a dual-opening ring coupling structure;
FIG. 3 is a schematic diagram of a single split ring coupling structure and a single split ring feed ring;
FIG. 4 is a simulation diagram of S parameter in the present invention;
fig. 5 is a schematic view of the radiation direction of the H-plane in the present invention;
fig. 6 is a schematic view of the E-plane radiation direction in the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
Referring to fig. 1 to 6, the present invention provides a low-profile ultrahigh frequency high-gain dual dipole tag antenna, which includes a planar dielectric plate, where the planar dielectric plate is FR 4; the dielectric constant of the planar dielectric plate is 4.4, the thickness is 1mm, the length is 196mm, and the width is 28.25 mm.
The planar dielectric plate is characterized by also comprising a single-opening annular coupling structure 2, a single-opening annular feed ring 1, a double-opening annular coupling structure 3 and a metal dipole antenna arm, wherein the single-opening annular coupling structure 2, the single-opening annular feed ring, the double-opening annular coupling structure 3 and the metal dipole antenna arm are positioned on the upper surface of the planar dielectric plate; the single-aperture annular feed ring 1 is embedded in the single-aperture annular coupling structure 2, and a first distance exists between the single-aperture annular feed ring and the single-aperture annular coupling structure; the double-opening annular coupling structure 3 is embedded in the single-opening annular coupling structure 2, and a second distance exists between the double-opening annular coupling structure and the single-opening annular coupling structure; wherein the distance value of the first distance can be adjusted, and the distance value of the second distance can be adjusted; the upper surface of the planar dielectric plate is also provided with two groups of metal dipole antennas which are parallel to each other; one group of metal dipole antennas is connected with the single-opening annular coupling structure 2, and the other group of metal dipole antennas is connected with the double-opening annular coupling structure 3.
Each group of metal dipole antennas comprises two metal dipole antenna arms; the single-opening annular coupling structure 2 is provided with a first opening, and two sides of the first opening are respectively connected with a metal dipole antenna arm. The double-opening annular coupling structure 3 is provided with a second opening and a third opening, two parallel metal strips extend from two sides of the second opening, and each metal strip is connected with one metal dipole antenna arm; the opening direction of the third opening is close to or overlapped with the opening direction of the first opening, or the opening direction of the third opening is close to or overlapped with the opening direction of the single-opening annular feed ring 1. The width of a parallel metal strip extending from the central lower opening of the double-opening annular coupling structure 3 is 1.5mm, and the length of the parallel metal strip is 7.42 mm.
In the embodiment of the present application, as shown in fig. 1 to fig. 3, a single-split ring-shaped feeding ring 1, a single-split ring-shaped coupling structure 2, and two metal dipole antenna arms connected to the single-split ring-shaped coupling structure 2 form a layer of structure on the upper surface of a planar dielectric slab, which is denoted as a top layer structure, and the corresponding metal dipole antenna is denoted as a dielectric slab top layer dipole antenna 4. The double-opening ring-shaped coupling structure 3 and the two metal dipole antenna arms connected with the double-opening ring-shaped coupling structure 3 form a layer of structure on the upper surface of the planar dielectric plate, the structure is recorded as a bottom layer structure, and the corresponding metal dipole antenna is recorded as a dielectric plate bottom layer dipole antenna 5.
The middle part of the upper surface of the planar dielectric plate is provided with a radio frequency identification chip antenna interface which is connected with an open loop coil. The upper and lower layers of metal dipole antennas are coupled with the single-opening annular feed ring 1 through the single-opening annular coupling structure 2 and the double-opening annular coupling structure 3 in the middle, so that good matching and large bandwidth with a 915MHz ultrahigh frequency radio frequency identification chip are achieved. Meanwhile, the three continuous nested coupling structures enable the radiation electric fields on the two metal dipole antenna arms at the bottom layer and the two metal dipole antenna arms at the top layer on the upper surface of the planar dielectric slab to be long by adjusting the current paths, so that the tag antenna realizes high gain with an extremely low section and length, the bandwidth can reach 550MHz, and the tag antenna perfectly covers the whole ultrahigh frequency band (860MHz-960 MHz). As an example, two parallel square metal strips are connected to the opening of the single-opening annular feed ring 1, and the two parallel square metal strips and the single-opening annular feed ring 1 cooperate to form a welding port of the radio frequency identification chip.
In the embodiment of the application, the distance value between the first distance and the second distance can be adjusted. By way of example, the first pitch is 0.5mm and the second pitch is 0.65 mm.
The utility model discloses in, the opening direction of using single aperture annular feed ring 1 or single aperture annular coupling structure 2 is the upper end. The utility model provides a plane medium board is FR4 material, and its dielectric constant is 4.4, and thickness is 1mm, length 196mm, width 28.25 mm. The inner circle radius of the single-opening annular feed ring 1 is 6.5mm, the outer circle radius is 8mm, the opening width of the upper end of the center of the single-opening annular feed ring 1 is 1.6mm, and the opening is longitudinally connected with two square metal strips which are parallel, 8mm long and 0.7mm wide, namely the chip welding port. Dielectric-slab top-layer dipole antenna 4 comprises two identical metal copper sheets extending left and right, the length of a single metal copper sheet is 95.5mm, the width of the single metal copper sheet is 2mm, and dielectric-slab top-layer dipole antenna 4 and single-opening annular coupling structure 2 are connected to the opening. The inner circle radius of the single-opening annular coupling structure 2 is 8.5mm, the outer circle radius is 10.5mm, the opening direction of the single-opening annular coupling structure 2 is the upper part of the annular center, and the opening width is 4 mm. The single-aperture annular feed ring 1 is embedded in the single-aperture annular coupling structure 2, and the distance between the single-aperture annular feed ring and the single-aperture annular coupling structure is 0.5 mm. The dielectric-slab bottom-layer dipole antenna 5 is composed of two identical metal copper sheets extending leftwards and rightwards, the length of a single metal copper sheet is 95mm, the width of the single metal copper sheet is 2.25mm, and the dielectric-slab bottom-layer dipole antenna 5 is connected with parallel metal strips extending from an opening in the lower portion of the center of the double-opening ring-shaped coupling structure 3. The width of the parallel metal strips extending from the central lower opening of the double-opening annular coupling structure 3 is 1.5mm, and the length of the parallel metal strips is 7.42 mm. The opening width in the middle of the double-opening annular coupling structure 3 is 4mm, the inner circle radius of the double-opening annular coupling structure 3 is 4.92mm, and the outer circle radius is 5.85 mm. The double-opening ring-shaped coupling structure 3 is embedded in the single-opening ring-shaped coupling structure 2, and the distance between the double-opening ring-shaped coupling structure and the single-opening ring-shaped coupling structure is 0.65 mm. The distance, gomphosis shape and the annular structure thickness of gomphosis between two open-ended ring coupling structure 3, single open-ended ring feed ring 1 and the single open-ended ring coupling structure 2 can be adjusted to can adjust and the impedance match between the radio frequency chip, and adjust the current path, make the electric current of two metal dipole antenna arms in the same group can flow to the syntropy, thereby can improve the utility model discloses the gain of well antenna.
The utility model provides an antenna has fine broadband performance and higher gain, and figure 4 to figure 6 show that be the utility model discloses the S parameter emulation picture and E face, the H face radiation direction schematic diagram of antenna. The antenna impedance of the utility model is easy to adjust, and the inductive reactance can be increased by increasing the width of the coupling feed ring or the annular feed structure; by enlarging the distance between the coupling feed ring and the annular feed structure, the capacitive reactance can be increased.
In summary, the utility model adopts the annular nested co-feeding mode, which increases the bandwidth and makes the working performance more stable; the antenna in the utility model is composed of two metal dipole antennas, and can realize high gain under the condition of low profile; the utility model provides an annular feed structure impedance easily adjusts, makes its radio frequency identification chip with various impedances match easily, realizes remote radio frequency identification. The utility model discloses in adopt single-deck rectangle FR4 medium plane dielectric slab to form the antenna. The upper surfaces of the plane dielectric plates are respectively provided with metal dipole antennas, and the middle parts of the metal dipole antennas are in an open arc shape. The middle part of the upper surface of the planar dielectric plate is provided with a radio frequency identification chip antenna interface which is connected with an annular coil, namely a single-opening annular feed ring. The metal dipole antenna at the bottom layer and the metal dipole antenna at the top layer are coupled with the single-opening annular feed ring through the single-opening annular coupling structure and the double-opening annular coupling structure in the middle of the planar dielectric plate, so that the good matching and the large bandwidth with the 915MHz ultrahigh-frequency radio frequency identification chip can be achieved. Meanwhile, by adjusting the current path, the radiation electric fields on the two metal dipole antenna arms at the bottom layer of the planar dielectric slab and the two metal dipole antenna arms at the bottom layer of the top layer are made to be longer, so that the tag antenna has high gain with an extremely low section and length, and the bandwidth can reach 550 MHz.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A low-profile ultrahigh frequency high gain double dipole tag antenna is characterized by comprising a planar dielectric slab, a single-opening annular coupling structure, a single-opening annular feed ring and a double-opening annular coupling structure, wherein the single-opening annular coupling structure, the single-opening annular feed ring and the double-opening annular coupling structure are positioned on the upper surface of the planar dielectric slab;
the single-opening annular feed ring is embedded in the single-opening annular coupling structure, a first distance exists between the single-opening annular feed ring and the single-opening annular coupling structure, and the distance value of the first distance can be adjusted;
the double-opening annular coupling structure is embedded in the single-opening annular coupling structure, a second distance exists between the double-opening annular coupling structure and the single-opening annular coupling structure, and the distance value of the second distance can be adjusted;
and the upper surface of the planar dielectric plate is also provided with two groups of metal dipole antennas which are parallel to each other, wherein one group of metal dipole antennas is connected with the single-opening annular coupling structure, and the other group of metal dipole antennas is connected with the double-opening annular coupling structure.
2. The low-profile uhf high-gain dual-dipole tag antenna of claim 1, wherein each set of metal dipole antennas comprises two metal dipole antenna arms;
the single-opening annular coupling structure is provided with a first opening, and two sides of the first opening are respectively connected with a metal dipole antenna arm;
the double-opening annular coupling structure is provided with a second opening and a third opening, two parallel metal strips extend from two sides of the second opening, and each metal strip is connected with one metal dipole antenna arm; the opening direction of the third opening is close to or overlapped with the opening direction of the first opening, or the opening direction of the third opening is close to or overlapped with the opening direction of the single-opening annular feed ring.
3. The low-profile ultrahigh frequency high gain double dipole tag antenna according to claim 2, wherein the single open loop feed ring, the single open loop coupling structure and the two metal dipole antenna arms connected with the single open loop coupling structure form a layer of structure on the upper surface of the planar dielectric slab, and the layer of structure is recorded as a top layer structure;
the double-opening annular coupling structure and the two metal dipole antenna arms connected with the double-opening annular coupling structure form a layer of structure on the upper surface of the planar dielectric plate, and the structure is marked as a bottom layer structure; and the top layer structure is positioned on the bottom layer structure.
4. The low-profile UHF dual-dipole tag antenna of claim 1, wherein the single-split annular feed ring has a fourth split, two parallel square metal strips are connected to the split of the fourth split, and the two parallel square metal strips and the single-split annular feed ring cooperate to form a welding port for an RFID chip.
5. The low profile uhf high gain dual dipole tag antenna of claim 1, wherein the first spacing has a distance value less than the second spacing; the first interval is 0.5mm, and the second interval is 0.65 mm.
6. The low profile uhf high gain dual dipole tag antenna of claim 1, wherein said planar dielectric slab is FR 4; the dielectric constant of the planar dielectric plate is 4.4, the thickness of the planar dielectric plate is 1mm, the length of the planar dielectric plate is 196mm, and the width of the planar dielectric plate is 28.25 mm.
7. The low-profile ultrahigh frequency high gain double dipole tag antenna of claim 1, wherein the inner circle radius of said single open-ended ring coupling structure is 8.5mm and the outer circle radius is 10.5 mm; the inner circle radius of the double-opening annular coupling structure is 4.92mm, and the outer circle radius of the double-opening annular coupling structure is 5.85 mm.
8. The low-profile uhf high-gain dual-dipole tag antenna of claim 1, wherein the inner circle radius of the single-split annular feed loop is 6.5mm and the outer circle radius is 8 mm.
9. The low-profile uhf high-gain dual-dipole tag antenna of claim 1, wherein the aperture width of the single aperture loop feed loop is 1.6 mm; the opening width of the double-opening annular coupling structure is 4 mm; the opening width of the single-opening annular coupling structure is 4 mm.
10. The low profile uhf high gain dual dipole tag antenna of claim 2, wherein the metal dipole antenna is formed from a sheet of metal copper; any metal dipole antenna connected with the single-opening annular coupling structure is 95.5mm long and 2mm wide; and any metal dipole antenna arm connected with the double-opening annular coupling structure is 95mm long and 2.25mm wide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023270349.7U CN214153176U (en) | 2020-12-28 | 2020-12-28 | Ultrahigh frequency high-gain double dipole tag antenna with low profile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023270349.7U CN214153176U (en) | 2020-12-28 | 2020-12-28 | Ultrahigh frequency high-gain double dipole tag antenna with low profile |
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| CN214153176U true CN214153176U (en) | 2021-09-07 |
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| CN202023270349.7U Active CN214153176U (en) | 2020-12-28 | 2020-12-28 | Ultrahigh frequency high-gain double dipole tag antenna with low profile |
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