CN113285204B - Ultrahigh frequency RFID anti-metal tag antenna based on microstrip structure - Google Patents
Ultrahigh frequency RFID anti-metal tag antenna based on microstrip structure Download PDFInfo
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- CN113285204B CN113285204B CN202110439790.3A CN202110439790A CN113285204B CN 113285204 B CN113285204 B CN 113285204B CN 202110439790 A CN202110439790 A CN 202110439790A CN 113285204 B CN113285204 B CN 113285204B
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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
- H01Q1/2225—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 active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
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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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Abstract
The invention discloses an ultrahigh frequency RFID anti-metal tag antenna based on a microstrip structure, which comprises a medium substrate and a radiation module arranged on the medium substrate, wherein the medium substrate is a rectangular plate, the radiation module is realized by adopting the microstrip structure, the radiation module comprises a radio frequency chip, a metal layer, a first rectangular groove, a second rectangular groove, a third rectangular groove, a first radiation unit and a second radiation unit, the first radiation unit and the second radiation unit are respectively composed of eight rectangular metal blocks, the first radiation unit and the second radiation unit not only form a symmetrical oscillator antenna structure, but also form a U-shaped groove communicated with the first rectangular groove and the third rectangular groove together with the second rectangular groove, and a gap formed between the first radiation unit and the second radiation unit and a gap arranged inside the first radiation unit and the second radiation unit form an impedance adjusting structure; the advantages are long reading distance, high gain, small size, simple processing technology, low cost and wide frequency band.
Description
Technical Field
The invention relates to an ultrahigh frequency RFID anti-metal tag antenna, in particular to an ultrahigh frequency RFID anti-metal tag antenna based on a microstrip structure.
Background
With the popularization of the internet of things technology in various fields, application scenes of Radio Frequency Identification (RFID) tags gradually tend to be diversified, and some applications require that an RFID tag antenna is mounted on articles made of different materials, such as glass, wood and even metal. RFID tag antennas are typically attached directly to the object to be identified, and metallic objects are very challenging for RFID tag antennas. When a common RFID tag antenna is placed on the surface of a metal object, the radiation resistance of the RFID tag antenna is sharply reduced due to the characteristic that electromagnetic waves are reflected when meeting the metal, and the original performance indexes of the RFID tag antenna are negatively affected to a certain degree, so that the recognizable range of the RFID tag antenna is sharply shortened, the reading distance is short, and the worse condition can not be recognized. In various industries using RFID tag antennas, many scenarios place demands on "identifying metal objects", such as electronic license plates, intermodal container shipments, and large mechanical devices. Therefore, ultrahigh frequency RFID anti-metal tag antennas with anti-metal characteristics have been produced and have been used in the context of metal environments.
The existing ultrahigh frequency RFID anti-metal tag antenna is usually realized based on a microstrip structure, has a metal floor, is less influenced by a metal environment and different metal surface sizes, can effectively reduce the influence of a metal surface, has a longer reading distance, and realizes the purpose of antenna miniaturization on the premise of keeping higher gain. However, the ultrahigh frequency RFID anti-metal tag antenna realized based on the microstrip structure generally needs to adopt a metal via hole, a short circuit patch, or a dielectric substrate with a high dielectric constant, and is complex in processing, high in cost, and narrow in frequency band.
Disclosure of Invention
The invention aims to solve the technical problem of providing the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure, which has the advantages of longer reading distance, higher gain, miniaturization, simple processing technology, lower cost and wider frequency band.
The technical scheme adopted by the invention for solving the technical problems is as follows: an ultrahigh frequency RFID anti-metal tag antenna based on a microstrip structure comprises a medium substrate and a radiation module arranged on the medium substrate, wherein the medium substrate is a rectangular plate, the radiation module is realized by adopting a microstrip structure, the radiation module comprises a radio frequency chip, a metal layer, a first rectangular groove, a second rectangular groove, a third rectangular groove, a first radiation unit and a second radiation unit, the metal layer is attached to the upper surface of the medium substrate, the front end surface of the metal layer is flush with the front end surface of the medium substrate, the rear end surface of the metal layer is flush with the rear end surface of the medium substrate, the left end surface of the metal layer is flush with the left end surface of the medium substrate, the right end surface of the metal layer is flush with the right end surface of the medium substrate, and the first rectangular groove, the second rectangular groove and the third rectangular groove are respectively arranged on the metal layer, the dielectric substrate is sequentially arranged from left to right, the upper surface of the dielectric substrate is exposed at the first rectangular groove, the second rectangular groove and the third rectangular groove, the planes of the front end surfaces of the first rectangular groove, the second rectangular groove and the third rectangular groove are respectively parallel to the plane of the front end surface of the dielectric substrate, the symmetrical plane of the second rectangular groove along the front-back direction and the symmetrical plane of the dielectric substrate along the front-back direction are positioned on the same plane, the symmetrical plane of the second rectangular groove along the left-right direction and the symmetrical plane of the dielectric substrate along the left-right direction are positioned on the same plane, the right end surface of the first rectangular groove is communicated with the left end surface of the second rectangular groove and is in a joint state, and the left end surface of the third rectangular groove is communicated with the right end surface of the second rectangular groove and is in a joint state, the rear end faces of the first rectangular groove, the second rectangular groove and the third rectangular groove are positioned on the same plane, the front end faces of the first rectangular groove and the third rectangular groove are positioned on the same plane, the plane is positioned on the rear side of the plane where the front end face of the second rectangular groove is positioned, the length of the first rectangular groove in the left-right direction is equal to the length of the third rectangular groove in the left-right direction, the plane where the left end face of the first rectangular groove is positioned has a certain distance with the plane where the left end face of the medium substrate is positioned, the first radiation unit comprises a first rectangular metal block, a second rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a fifth rectangular metal block, a sixth rectangular metal block, a seventh rectangular metal block and an eighth rectangular metal block, and the first rectangular metal block, the second rectangular metal block, the third rectangular metal block, the fourth rectangular metal block, the fifth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block, The third rectangular metal block, the fourth rectangular metal block, the fifth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block are respectively attached to the upper surface of the medium substrate, the first rectangular metal block, the second rectangular metal block, the third rectangular metal block and the fourth rectangular metal block are sequentially arranged at intervals from front to back, the fifth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block are sequentially arranged from left to right, the front end surface of the first rectangular metal block is parallel to the front end surface of the second rectangular groove, a distance is reserved between the front end surface and the front end surface, the right end surface of the first rectangular metal block is positioned on the left side of the symmetrical surface of the medium substrate along the front-back direction, and a distance is provided between the first rectangular metal block and the second rectangular metal block, the right end faces of the second rectangular metal block, the third rectangular metal block and the fourth rectangular metal block are positioned on the same plane, the plane is positioned on the left side of the plane of the right end face of the first rectangular metal block, the left end faces of the second rectangular metal block and the third rectangular metal block are positioned on the same plane, the plane is positioned on the right side of the plane of the left end face of the fourth rectangular metal block, the left end face of the fourth rectangular metal block is positioned on the right side of the plane of the left end face of the first rectangular metal block, the rear end face of the fourth rectangular metal block is parallel to the rear end face of the second rectangular groove, a distance is provided between the rear end face of the fourth rectangular metal block and the rear end face of the first rectangular metal block, and the front end face of the fifth rectangular metal block is positioned on the same plane, the rear end face of the fifth rectangular metal block and the rear end face of the second rectangular groove are positioned on the same plane, a distance is reserved between the left end face of the fifth rectangular metal block and the left end face of the second rectangular groove, the right end face of the fifth rectangular metal block is attached and connected with the left end face of the first rectangular metal block, the rear end face of the sixth rectangular metal block and the rear end face of the fifth rectangular metal block are positioned on the same plane, the left end face of the sixth rectangular metal block is attached and connected with the right end face of the fifth rectangular metal block, the right end face of the sixth rectangular metal block is attached and connected with the left end face of the fourth rectangular metal block, the front end face of the sixth rectangular metal block and the front end face of the fourth rectangular metal block are positioned on the same plane, and the front end face of the seventh rectangular metal block is flush with the front end face of the second rectangular metal block, the rear end face of the seventh rectangular metal block is flush with the rear end face of the third rectangular metal block, the right end face of the seventh rectangular metal block is respectively attached and connected with the left end face of the second rectangular metal block and the left end face of the third rectangular metal block, the plane where the left end face of the seventh rectangular metal block is located on the right side of the plane where the right end face of the sixth rectangular metal block is located, a distance is reserved between the seventh rectangular metal block and the sixth rectangular metal block, the front end face of the eighth rectangular metal block is attached and connected with the rear end face of the third rectangular metal block, the rear end face of the eighth rectangular metal block is attached and connected with the front end face of the fourth rectangular metal block, and the right end face of the eighth rectangular metal block and the right end face of the third rectangular metal block are located on the same plane, the plane of the left end face of the eighth rectangular metal block is positioned on the right side of the plane of the left end face of the third rectangular metal block; the second radiating unit and the first radiating unit are bilaterally symmetrical relative to the symmetry plane of the second rectangular groove in the front-back direction, a first gap is formed between the first rectangular metal block of the first radiating unit and the rectangular metal block of the second radiating unit which is symmetrical to the first rectangular metal block, the radio frequency chip is arranged at the first gap, the radio frequency chip is respectively connected with the first rectangular metal block of the first radiating unit and the rectangular metal block of the second radiating unit which is symmetrical to the first rectangular metal block, a fourth rectangular groove is further arranged on the metal layer, the upper surface of the dielectric substrate is exposed at the fourth rectangular groove, the fourth rectangular groove is bilaterally symmetrical relative to the symmetry plane of the second rectangular groove in the front-back direction, and the front end face of the fourth rectangular groove is attached to and communicated with the rear end face of the second rectangular groove, the rear end face of the fourth rectangular groove is flush with the rear end face of the metal layer, and the length of the fourth rectangular groove in the left-right direction is greater than that of the first gap in the left-right direction; the left end face of the second rectangular groove, the front end face of the second rectangular groove, the right end face of the second rectangular groove, the fifth rectangular metal block, the first rectangular metal block, the rectangular metal block in the second radiating unit, which is symmetrical to the first rectangular metal block, and the rectangular metal block in the second radiating unit, which is symmetrical to the fifth rectangular metal block, enclose a U-shaped groove, and the U-shaped groove is respectively communicated with the first rectangular groove and the third rectangular groove and then used for adjusting a surface current flowing path of the ultrahigh frequency RFID anti-metal tag antenna, so that the size of the ultrahigh frequency RFID anti-metal tag antenna is reduced; the second radiating unit and the structures in symmetry with the second rectangular metal block, the third rectangular metal block, the fourth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block in the first radiating unit also form a vibrator antenna structure, and the symmetrical vibrator structure formed by the two vibrator antenna structures is used for expanding the frequency band of the ultrahigh frequency RFID anti-metal tag antenna so that the ultrahigh frequency RFID anti-metal tag antenna has the broadband characteristic; the fourth rectangular groove, the first rectangular groove formed among the second rectangular metal block, the third rectangular metal block and the seventh rectangular metal block in the first radiating unit, the second rectangular groove formed among the third rectangular metal block, the fourth rectangular metal block and the eighth rectangular metal block in the first radiating unit, the third rectangular groove formed among the fourth rectangular metal block, the sixth rectangular metal block and the rear end face of the second rectangular groove in the first radiating unit, the rectangular groove symmetrical to the first rectangular groove in the second radiating unit, the rectangular groove symmetrical to the second rectangular groove in the second radiating unit and the rectangular groove symmetrical to the third rectangular groove in the second radiating unit form an impedance adjusting structure for adjusting the impedance of the ultrahigh frequency anti-metal tag antenna to perform impedance matching.
The medium substrate is realized by an epoxy glass cloth laminated board with the thickness of 1.5mm, and the first rectangular groove, the second rectangular groove, the third rectangular groove, the first gap, the fourth rectangular groove, the first radiation unit and the second radiation unit are respectively formed by adopting an etching process.
The length of the dielectric substrate along the left-right direction is 73mm, and the length of the dielectric substrate along the front-back direction is 24 mm; the length of the first rectangular groove along the left-right direction is 8mm, and the length of the first rectangular groove along the front-back direction is 2 mm; the length of the second rectangular groove along the left-right direction is 37mm, and the length of the second rectangular groove along the front-back direction is 18 mm; the length of the third rectangular groove along the left-right direction is 8mm, and the length of the third rectangular groove along the front-back direction is 2 mm; the length of the first rectangular metal block along the left-right direction is 13.75mm, and the length of the first rectangular metal block along the front-back direction is 2.5 mm; the length of the second rectangular metal block along the left-right direction is 6mm, and the length of the second rectangular metal block along the front-back direction is 2 mm; the length of the third rectangular metal block along the left-right direction is 6mm, and the length of the third rectangular metal block along the front-back direction is 2 mm; the length of the fourth rectangular metal block along the left-right direction is 10mm, and the length of the fourth rectangular metal block along the front-back direction is 2 mm; the length of the fifth rectangular metal block along the left-right direction is 2.5mm, and the length of the fifth rectangular metal block along the front-back direction is 16 mm; the length of the sixth rectangular metal block along the left-right direction is 2mm, and the length of the sixth rectangular metal block along the front-back direction is 4 mm; the length of the seventh rectangular metal block along the left-right direction is 2mm, and the length of the seventh rectangular metal block along the front-back direction is 6 mm; the length of the eighth rectangular metal block along the left-right direction is 2mm, and the length of the eighth rectangular metal block along the front-back direction is 2 mm; the distance between the left end surface of the fifth rectangular metal block and the left end surface of the second rectangular metal block is 2mm, the distance between the left end surface of the seventh rectangular metal block and the right end surface of the fifth rectangular metal block is 4mm, the distance between the plane of the left end surface of the first rectangular metal block and the plane of the left end surface of the dielectric substrate is 10mm, the distance between the front end surface of the first rectangular metal block and the front end surface of the second rectangular metal block is 2mm, the distance between the rear end surface of the fourth rectangular metal block and the rear end surface of the second rectangular metal block is 2mm, the distance between the rear end surface of the first rectangular metal block and the front end surface of the second rectangular metal block is 1.5mm, and the distance between the rear end surface of the second rectangular metal block and the front end surface of the third rectangular metal block is 2mm, the rear end face of the third rectangular metal block and the front end face of the fourth rectangular metal block are 2mm in distance, the length of the fourth rectangular groove in the left-right direction is 2mm, the length of the fourth rectangular groove in the front-back direction is 3mm, the length of the first gap in the left-right direction is 0.5mm, and the length of the first gap in the front-back direction is 2.5 mm.
Compared with the prior art, the antenna has the advantages that the left end face of the second rectangular groove, the front end face of the second rectangular groove, the right end face of the second rectangular groove, the fifth rectangular metal block, the first rectangular metal block, the rectangular metal block in the second radiating unit, which is symmetrical to the first rectangular metal block, and the rectangular metal block in the second radiating unit, which is symmetrical to the fifth rectangular metal block, form a U-shaped groove, the current flowing path can be conveniently changed by changing the size of the U-shaped groove, the electrical size of the antenna is increased in a limited volume, the actual size of the antenna is greatly reduced, and the miniaturization effect is achieved. In addition, a second rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a sixth rectangular metal block, a seventh rectangular metal block and an eighth rectangular metal block in the first radiation unit form a vibrator antenna structure, a symmetrical structure of the second radiation unit and the second rectangular metal block, the third rectangular metal block, the fourth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block in the first radiation unit also forms a vibrator antenna structure, the symmetrical vibrator structure formed by the two vibrator structures excites a new resonance mode on the antenna structure, two resonance points can be positioned in an ultrahigh frequency band through proper size adjustment, the return loss in two bandwidth ranges is smaller than-10 dB, the bandwidth of the antenna is greatly widened, and the result of more than 2 times of the bandwidth of the original common microstrip antenna is achieved, the 10dB bandwidth covers the ultrahigh frequency band and has good broadband characteristic, a fourth rectangular groove, a second rectangular metal block in the first radiating unit, a first rectangular groove formed between the third rectangular metal block and the seventh rectangular metal block, a second rectangular groove formed between the third rectangular metal block in the first radiating unit, the fourth rectangular metal block and the eighth rectangular metal block, a fourth rectangular metal block in the first radiating unit, a third rectangular groove formed between the sixth rectangular metal block and the rear end face of the second rectangular groove, a rectangular groove symmetrical to the first rectangular groove in the second radiating unit, a rectangular groove symmetrical to the second rectangular groove in the second radiating unit and a rectangular groove symmetrical to the third rectangular groove in the second radiating unit form an impedance adjusting structure, the length and the width of the three rectangular grooves are adjusted to adjust the antenna so as to reach the conjugate value of the output impedance of the radio frequency chip, the purpose of impedance matching is achieved, and due to the existence of the symmetrical dipole structure, the internal space of the antenna is greatly utilized, the frequency band can be widened, the whole radiation area of the antenna is not greatly reduced, the gain is still high, the gain is not excessively sacrificed in order to achieve the purpose of broadband, and good balance is achieved. The whole antenna has no metal through hole or short circuit patch structure, and is simple to process and low in cost. Therefore, the invention has the advantages of longer reading distance, higher gain, miniaturization realization, simple processing technology, lower cost and wider frequency band. The antenna has high gain of-3.4 dB, an ultra-long reading distance of more than 10m, impedance matching of more than 99.2 percent, a 10dB bandwidth of 28MHz which is more than twice of the bandwidth of a common microstrip antenna and broadband characteristics.
Drawings
FIG. 1 is a top view of an UHF RFID anti-metal tag antenna based on a microstrip structure according to the present invention;
FIG. 2 is a simulation diagram of return loss of the UHF RFID anti-metal tag antenna based on the microstrip structure;
FIG. 3 is a schematic diagram of the input impedance of the UHF RFID anti-metal tag antenna based on the microstrip structure according to the present invention;
fig. 4 is a radiation pattern of the ultra-high frequency RFID anti-metal tag antenna based on the microstrip structure of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example (b): as shown in fig. 1, an ultrahigh frequency RFID anti-metal tag antenna based on a microstrip structure comprises a dielectric substrate and a radiation module arranged on the dielectric substrate, wherein the dielectric substrate is a rectangular plate, the radiation module is implemented by adopting a microstrip structure, the radiation module comprises a radio frequency chip, a metal layer 1, a first rectangular groove 2, a second rectangular groove 3, a third rectangular groove 4, a first radiation unit 5 and a second radiation unit 6, the metal layer 1 is attached to the upper surface of the dielectric substrate, the front end surface of the metal layer 1 is flush with the front end surface of the dielectric substrate, the rear end surface of the metal layer 1 is flush with the rear end surface of the dielectric substrate, the left end surface of the metal layer 1 is flush with the left end surface of the dielectric substrate, the right end surface of the metal layer 1 is flush with the right end surface of the dielectric substrate, the first rectangular groove 2, the second rectangular groove 3 and the third rectangular groove 4 are respectively arranged on the metal layer 1 and are sequentially arranged from left to right, the upper surface of the medium substrate is exposed at the positions of a first rectangular groove 2, a second rectangular groove 3 and a third rectangular groove 4, the planes of the front end surfaces of the first rectangular groove 2, the second rectangular groove 3 and the third rectangular groove 4 are respectively parallel to the plane of the front end surface of the medium substrate, the symmetrical surfaces of the second rectangular groove 3 along the front-back direction and the symmetrical surfaces of the medium substrate along the front-back direction are positioned on the same plane, the symmetrical surfaces of the second rectangular groove 3 along the left-right direction and the symmetrical surfaces of the medium substrate along the left-right direction are positioned on the same plane, the right end surface of the first rectangular groove 2 is communicated with and attached to the left end surface of the second rectangular groove 3, the left end surface of the third rectangular groove 4 is communicated with and attached to the right end surface of the second rectangular groove 3, the rear end surfaces of the first rectangular groove 2, the second rectangular groove 3 and the third rectangular groove 4 are positioned on the same plane, the front end surfaces of the first rectangular groove 2 and the third rectangular groove 4 are positioned on the same plane, the plane is located at the rear side of the plane of the front end face of the second rectangular groove 3, the length of the first rectangular groove 2 in the left-right direction is equal to the length of the third rectangular groove 4 in the left-right direction, the plane of the left end face of the first rectangular groove 2 has a distance with the plane of the left end face of the dielectric substrate, the first radiating unit 5 comprises a first rectangular metal block 51, a second rectangular metal block 52, a third rectangular metal block 53, a fourth rectangular metal block 54, a fifth rectangular metal block 55, a sixth rectangular metal block 56, a seventh rectangular metal block 57 and an eighth rectangular metal block 58, the first rectangular metal block 51, the second rectangular metal block 52, the third rectangular metal block 53, the fourth rectangular metal block 54, the fifth rectangular metal block 55, the sixth rectangular metal block 56, the seventh rectangular metal block 57 and the eighth rectangular metal block 58 are respectively attached to the upper surface of the dielectric substrate, the first rectangular metal block 51, the third rectangular metal block 53, the fourth rectangular metal block 54, the fifth rectangular metal block 55, the sixth rectangular metal block 56, the seventh rectangular metal block 57 and the eighth rectangular metal block 58 are respectively attached to the upper surface of the dielectric substrate, The second rectangular metal block 52, the third rectangular metal block 53 and the fourth rectangular metal block 54 are sequentially arranged at intervals from front to back, the fifth rectangular metal block 55, the sixth rectangular metal block 56, the seventh rectangular metal block 57 and the eighth rectangular metal block 58 are sequentially arranged from left to right, the front end surface of the first rectangular metal block 51 is parallel to the front end surface of the second rectangular slot 3 with a distance therebetween, the right end surface of the first rectangular metal block 51 is positioned at the left side of the symmetrical plane of the dielectric substrate along the front-back direction with a distance therebetween, the right end surfaces of the second rectangular metal block 52, the third rectangular metal block 53 and the fourth rectangular metal block 54 are positioned on the same plane, the plane is positioned at the left side of the plane of the right end surface of the first rectangular metal block 51, the left end surfaces of the second rectangular metal block 52 and the third rectangular metal block 53 are positioned on the same plane, the plane is positioned on the right side of the plane where the left end face of the fourth rectangular metal block 54 is positioned, the left end face of the fourth rectangular metal block 54 is positioned on the right side of the plane where the left end face of the first rectangular metal block 51 is positioned, the rear end face of the fourth rectangular metal block 54 is parallel to the rear end face of the second rectangular groove 3, a distance is reserved between the left end face of the fifth rectangular metal block 55 and the front end face of the first rectangular metal block 51, the rear end face of the fifth rectangular metal block 55 and the rear end face of the second rectangular groove 3 are positioned on the same plane, a distance is reserved between the left end face of the fifth rectangular metal block 55 and the left end face of the second rectangular groove 3, the right end face of the fifth rectangular metal block 55 is attached and connected to the left end face of the first rectangular metal block 51, the rear end face of the sixth rectangular metal block 56 and the rear end face of the fifth rectangular metal block 55 are positioned on the same plane, the left end face of the sixth rectangular metal block 56 and the right end face of the fifth rectangular metal block 55 are attached and connected, the right end face of the sixth rectangular metal block 56 is attached to the left end face of the fourth rectangular metal block 54, the front end face of the sixth rectangular metal block 56 and the front end face of the fourth rectangular metal block 54 are located on the same plane, the front end face of the seventh rectangular metal block 57 is flush with the front end face of the second rectangular metal block 52, the rear end face of the seventh rectangular metal block 57 is flush with the rear end face of the third rectangular metal block 53, the right end face of the seventh rectangular metal block 57 is respectively attached to the left end face of the second rectangular metal block 52 and the left end face of the third rectangular metal block 53, the left end face of the seventh rectangular metal block 57 is located on the right side of the right end face of the sixth rectangular metal block 56, a distance is reserved between the left end face and the right end face, the eighth rectangular metal block 58 is located between the third rectangular metal block 53 and the fourth rectangular metal block 54, the front end face of the eighth rectangular metal block 58 is attached to the rear end face of the third rectangular metal block 53, the rear end face of the eighth rectangular metal block 58 is attached to and connected with the front end face of the fourth rectangular metal block 54, the right end face of the eighth rectangular metal block 58 and the right end face of the third rectangular metal block 53 are located on the same plane, and the plane where the left end face of the eighth rectangular metal block 58 is located on the right side of the plane where the left end face of the third rectangular metal block 53 is located; the second radiation unit 6 and the first radiation unit 5 are bilaterally symmetrical relative to a symmetrical plane of the second rectangular groove 3 along the front-back direction, a first gap 7 is formed between a first rectangular metal block 51 of the first radiation unit 5 and a rectangular metal block symmetrical to the first rectangular metal block 51 in the second radiation unit 6, the radio frequency chip is arranged at the first gap 7, the radio frequency chip is respectively connected with the first rectangular metal block 51 of the first radiation unit 5 and the rectangular metal block symmetrical to the first rectangular metal block 51 in the second radiation unit 6, the metal layer 1 is also provided with a fourth rectangular groove 8, the upper surface of the medium substrate is exposed at the fourth rectangular groove 8, the fourth rectangular groove 8 is bilaterally symmetrical relative to the symmetrical plane of the second rectangular groove 3 along the front-back direction, the front end surface of the fourth rectangular groove 8 is attached and communicated with the rear end surface of the second rectangular groove 3, and the rear end surface of the fourth rectangular groove 8 is flush with the rear end surface of the metal layer 1, the length of the fourth rectangular groove 8 in the left-right direction is greater than the length of the first gap 7 in the left-right direction; the left end face of the second rectangular groove 3, the front end face of the second rectangular groove 3, the right end face of the second rectangular groove 3, the fifth rectangular metal block 55, the first rectangular metal block 51, the rectangular metal block in the second radiating unit 6, which is symmetrical to the first rectangular metal block 51, and the rectangular metal block in the second radiating unit 6, which is symmetrical to the fifth rectangular metal block 55, enclose a U-shaped groove, and the U-shaped groove is respectively communicated with the first rectangular groove 2 and the third rectangular groove 4 and then used for adjusting the surface current flowing path of the ultrahigh frequency RFID anti-metal tag antenna, so that the size of the ultrahigh frequency RFID anti-metal tag antenna is reduced; a second rectangular metal block 52, a third rectangular metal block 53, a fourth rectangular metal block 54, a sixth rectangular metal block 56, a seventh rectangular metal block 57 and an eighth rectangular metal block 58 in the first radiating unit 5 form a dipole antenna structure, a structure in the second radiating unit 6, which is symmetrical to the second rectangular metal block 52, the third rectangular metal block 53, the fourth rectangular metal block 54, the sixth rectangular metal block 56, the seventh rectangular metal block 57 and the eighth rectangular metal block 58 in the first radiating unit 5, also forms a dipole antenna structure, and the dipole structure formed by the two dipole antenna structures is used for expanding the frequency band of the ultrahigh frequency RFID anti-metal tag antenna, so that the ultrahigh frequency tag antenna has broadband characteristics; the fourth rectangular slot 8, the first rectangular slot 9 formed between the second rectangular metal block 52 in the first radiating element 5, the third rectangular metal block 53 and the seventh rectangular metal block 57, the second rectangular slot 10 formed between the third rectangular metal block 53 in the first radiating element 5, the fourth rectangular metal block 54 and the eighth rectangular metal block 58, the fourth rectangular metal block 54 in the first radiating element 5, the third rectangular slot 11 formed between the sixth rectangular metal block 56 and the rear end surface of the second rectangular slot 3, the rectangular slot in the second radiating element 6 symmetrical to the first rectangular slot 9, the rectangular slot in the second radiating element 6 symmetrical to the second rectangular slot 10, and the rectangular slot in the second radiating element 6 symmetrical to the third rectangular slot 11 constitute an impedance adjusting structure for adjusting the impedance of the uhf RFID tag antenna for impedance matching.
In this embodiment, the dielectric substrate is implemented by an epoxy glass cloth laminated board with a thickness of 1.5mm, and the first rectangular groove 2, the second rectangular groove 3, the third rectangular groove 4, the first gap 7, the fourth rectangular groove 8, the first radiation unit 5, and the second radiation unit 6 are formed by an etching process.
In the embodiment, the length of the dielectric substrate in the left-right direction is 73mm, and the length in the front-back direction is 24 mm; the length of the first rectangular groove 2 along the left-right direction is 8mm, and the length along the front-back direction is 2 mm; the length of the second rectangular groove 3 in the left-right direction is 37mm, and the length in the front-rear direction is 18 mm; the length of the third rectangular groove 4 in the left-right direction is 8mm, and the length in the front-back direction is 2 mm; the length of the first rectangular metal block 51 in the left-right direction is 13.75mm, and the length in the front-rear direction is 2.5 mm; the length of the second rectangular metal block 52 in the left-right direction is 6mm, and the length in the front-rear direction is 2 mm; the length of the third rectangular metal block 53 in the left-right direction is 6mm, and the length in the front-rear direction is 2 mm; the length of the fourth rectangular metal block 54 in the left-right direction is 10mm, and the length in the front-rear direction is 2 mm; the length of the fifth rectangular metal block 55 in the left-right direction is 2.5mm, and the length in the front-rear direction is 16 mm; the length of the sixth rectangular metal block 56 in the left-right direction is 2mm, and the length in the front-rear direction is 4 mm; the length of the seventh rectangular metal block 57 in the left-right direction is 2mm, and the length in the front-rear direction is 6 mm; the eighth rectangular metal block 58 has a length of 2mm in the left-right direction and a length of 2mm in the front-rear direction; the distance between the left end face of the fifth rectangular metal block 55 and the left end face of the second rectangular metal block 3 is 2mm, the distance between the left end face of the seventh rectangular metal block 57 and the right end face of the fifth rectangular metal block 55 is 4mm, the distance between the plane of the left end face of the first rectangular groove 2 and the plane of the left end face of the dielectric substrate is 10mm, the distance between the front end face of the first rectangular metal block 51 and the front end face of the second rectangular groove 3 is 2mm, the distance between the rear end face of the fourth rectangular metal block 54 and the rear end face of the second rectangular groove 3 is 2mm, the distance between the rear end face of the first rectangular metal block 51 and the front end face of the second rectangular metal block 52 is 1.5mm, the distance between the rear end face of the second rectangular metal block 52 and the front end face of the third rectangular metal block 53 is 2mm, and the distance between the rear end face of the third rectangular metal block 53 and the front end face of the fourth rectangular metal block 54 is 2 mm; the length of the fourth rectangular groove 8 in the left-right direction is 2mm, the length in the front-rear direction is 3mm, the length of the first gap 7 in the left-right direction is 0.5mm, and the length in the front-rear direction is 2.5 mm.
The HFSS is adopted to carry out modeling simulation on the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure, and a Higgs-4 chip is adopted as a radio frequency chip during simulation. The return loss simulation curve of the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure is shown in fig. 2, the schematic input impedance diagram of the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure is shown in fig. 3, and the radiation pattern of the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure is shown in fig. 4. Analyzing fig. 2 shows that: the resonance frequencies of the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure are 0.908GHz and 0.925GHz respectively, and the return loss at the resonance frequency is below-20 dB. In addition, the 10dB bandwidth of the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure is 0.902-0.930GHz, the percentage is 3%, compared with the common anti-metal antenna adopting the microstrip structure, the bandwidth is expanded by more than two times, the ultrahigh frequency RFID anti-metal tag antenna has the characteristic of wide frequency band, and the ultrahigh frequency band is covered by the frequency band, so that the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure has practicability; analysis of FIG. 3 reveals that: the impedance of the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure is in an ascending trend in a frequency range shown in the figure, the impedance at the resonance frequency is 22.23+ j182.08 omega (the impedance of a radio frequency chip at the frequency is 19-j182 omega), the impedance matching effect is achieved, and the transmission efficiency is 99.2%; analysis of FIG. 4 reveals that: the ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure has good directivity, all radiation is basically concentrated on the front side, and the maximum gain in the maximum direction is-3.4 dB.
Claims (3)
1. The ultrahigh frequency RFID anti-metal tag antenna based on the microstrip structure comprises a medium substrate and a radiation module arranged on the medium substrate, wherein the medium substrate is a rectangular plate, and the radiation module is realized by adopting a microstrip structure and is characterized in that the radiation module comprises a radio frequency chip, a metal layer, a first rectangular groove, a second rectangular groove, a third rectangular groove, a first radiation unit and a second radiation unit, the metal layer is attached to the upper surface of the medium substrate, the front end surface of the metal layer is flush with the front end surface of the medium substrate, the rear end surface of the metal layer is flush with the rear end surface of the medium substrate, the left end surface of the metal layer is flush with the left end surface of the medium substrate, the right end surface of the metal layer is flush with the right end surface of the medium substrate, and the first rectangular groove is flush with the right end surface of the medium substrate, The second rectangular groove and the third rectangular groove are respectively arranged on the metal layer and are sequentially arranged from left to right, the upper surface of the medium substrate is exposed at the first rectangular groove, the second rectangular groove and the third rectangular groove, the planes of the front end surfaces of the first rectangular groove, the second rectangular groove and the third rectangular groove are respectively parallel to the plane of the front end surface of the medium substrate, the symmetry plane of the second rectangular groove along the front-back direction and the symmetry plane of the medium substrate along the front-back direction are positioned on the same plane, the symmetry plane of the second rectangular groove along the left-right direction and the symmetry plane of the medium substrate along the left-right direction are positioned on the same plane, the right end surface of the first rectangular groove is communicated with the left end surface of the second rectangular groove and is in a joint state, the left end face of the third rectangular groove is communicated with the right end face of the second rectangular groove and is in a fit state, the rear end faces of the first rectangular groove, the second rectangular groove and the third rectangular groove are located on the same plane, the front end faces of the first rectangular groove and the third rectangular groove are located on the same plane, the plane is located on the rear side of the plane where the front end face of the second rectangular groove is located, the length of the first rectangular groove in the left-right direction is equal to the length of the third rectangular groove in the left-right direction, the plane where the left end face of the first rectangular groove is located and the plane where the left end face of the medium substrate is located have a distance, and the first radiation unit comprises a first rectangular metal block, a second rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a fifth rectangular metal block, a sixth rectangular metal block, a fourth rectangular metal block, a fourth metal block, a third rectangular metal block, a fourth rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a second rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a second rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a third rectangular metal block, a second rectangular metal block, a third rectangular metal block, a second rectangular metal block, a fourth rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a second rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a third rectangular metal block, a fourth rectangular metal block, a second rectangular metal block, A seventh rectangular metal block and an eighth rectangular metal block, wherein the first rectangular metal block, the second rectangular metal block, the third rectangular metal block, the fourth rectangular metal block, the fifth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block are respectively attached to the upper surface of the medium substrate, the first rectangular metal block, the second rectangular metal block, the third rectangular metal block and the fourth rectangular metal block are sequentially arranged at intervals from front to back, the fifth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block are sequentially arranged from left to right, the front end surface of the first rectangular metal block is parallel to the front end surface of the second rectangular groove, and a distance is reserved between the front end surface and the front end surface, the right end face of the first rectangular metal block is positioned on the left side of a symmetrical plane of the dielectric substrate along the front-back direction, and a distance is reserved between the right end face of the second rectangular metal block and the right end face of the third rectangular metal block and the right end face of the fourth rectangular metal block, the plane is positioned on the left side of the plane where the right end face of the first rectangular metal block is positioned, the left end faces of the second rectangular metal block and the third rectangular metal block are positioned on the same plane, the plane is positioned on the right side of the plane where the left end face of the fourth rectangular metal block is positioned, the left end face of the fourth rectangular metal block is positioned on the right side of the plane where the left end face of the first rectangular metal block is positioned, the rear end face of the fourth rectangular metal block is parallel to the rear end face of the second rectangular groove, and a distance is reserved between the two rectangular metal blocks, the front end surface of the fifth rectangular metal block and the front end surface of the first rectangular metal block are positioned on the same plane, the rear end surface of the fifth rectangular metal block and the rear end surface of the second rectangular groove are positioned on the same plane, a distance is reserved between the left end surface of the fifth rectangular metal block and the left end surface of the second rectangular groove, the right end surface of the fifth rectangular metal block is attached and connected with the left end surface of the first rectangular metal block, the rear end surface of the sixth rectangular metal block and the rear end surface of the fifth rectangular metal block are positioned on the same plane, the left end surface of the sixth rectangular metal block and the right end surface of the fifth rectangular metal block are attached and connected, the right end surface of the sixth rectangular metal block and the left end surface of the fourth rectangular metal block are attached and connected, and the front end surface of the sixth rectangular metal block and the front end surface of the fourth rectangular metal block are positioned on the same plane, the front end face of the seventh rectangular metal block is flush with the front end face of the second rectangular metal block, the rear end face of the seventh rectangular metal block is flush with the rear end face of the third rectangular metal block, the right end face of the seventh rectangular metal block is respectively connected with the left end face of the second rectangular metal block and the left end face of the third rectangular metal block in an attaching manner, the plane where the left end face of the seventh rectangular metal block is located is positioned on the right side of the plane where the right end face of the sixth rectangular metal block is located, a distance is reserved between the plane and the plane, the eighth rectangular metal block is positioned between the third rectangular metal block and the fourth rectangular metal block, the front end face of the eighth rectangular metal block is connected with the rear end face of the third rectangular metal block in an attaching manner, and the rear end face of the eighth rectangular metal block is connected with the front end face of the fourth rectangular metal block in an attaching manner, the right end face of the eighth rectangular metal block and the right end face of the third rectangular metal block are positioned on the same plane, and the plane where the left end face of the eighth rectangular metal block is positioned on the right side of the plane where the left end face of the third rectangular metal block is positioned; the second radiation unit and the first radiation unit are bilaterally symmetrical relative to a symmetrical plane of the second rectangular groove in the front-back direction, a first gap is formed between a first rectangular metal block of the first radiation unit and a rectangular metal block of the second radiation unit which is symmetrical to the first rectangular metal block, the radio frequency chip is arranged at the first gap, the radio frequency chip is respectively connected with the first rectangular metal block of the first radiation unit and the rectangular metal block of the second radiation unit which is symmetrical to the first rectangular metal block, a fourth rectangular groove is further arranged on the metal layer, the upper surface of the dielectric substrate is exposed at the fourth rectangular groove, the fourth rectangular groove is bilaterally symmetrical relative to the symmetrical plane of the second rectangular groove in the front-back direction, and the front end face of the fourth rectangular groove is attached and communicated with the rear end face of the second rectangular groove, the rear end face of the fourth rectangular groove is flush with the rear end face of the metal layer, and the length of the fourth rectangular groove in the left-right direction is greater than that of the first gap in the left-right direction;
the left end face of the second rectangular groove, the front end face of the second rectangular groove, the right end face of the second rectangular groove, the fifth rectangular metal block, the first rectangular metal block, the rectangular metal block in the second radiating unit, which is symmetrical to the first rectangular metal block, and the rectangular metal block in the second radiating unit, which is symmetrical to the fifth rectangular metal block, enclose a U-shaped groove, and the U-shaped groove is respectively communicated with the first rectangular groove and the third rectangular groove and then used for adjusting a surface current flowing path of the ultrahigh frequency RFID anti-metal tag antenna, so that the size of the ultrahigh frequency RFID anti-metal tag antenna is reduced; the second radiating unit and the structures in symmetry with the second rectangular metal block, the third rectangular metal block, the fourth rectangular metal block, the sixth rectangular metal block, the seventh rectangular metal block and the eighth rectangular metal block in the first radiating unit also form a vibrator antenna structure, and the symmetrical vibrator structure formed by the two vibrator antenna structures is used for expanding the frequency band of the ultrahigh frequency RFID anti-metal tag antenna so that the ultrahigh frequency RFID anti-metal tag antenna has the broadband characteristic; the fourth rectangular groove, the first rectangular groove formed among the second rectangular metal block, the third rectangular metal block and the seventh rectangular metal block in the first radiating unit, the second rectangular groove formed among the third rectangular metal block, the fourth rectangular metal block and the eighth rectangular metal block in the first radiating unit, the third rectangular groove formed among the fourth rectangular metal block, the sixth rectangular metal block and the rear end face of the second rectangular groove in the first radiating unit, the rectangular groove symmetrical to the first rectangular groove in the second radiating unit, the rectangular groove symmetrical to the second rectangular groove in the second radiating unit and the rectangular groove symmetrical to the third rectangular groove in the second radiating unit form an impedance adjusting structure for adjusting the impedance of the ultrahigh frequency anti-metal tag antenna to perform impedance matching.
2. The UHF RFID tag antenna based on the microstrip structure as claimed in claim 1, wherein the dielectric substrate is realized by an epoxy glass cloth laminated board with a thickness of 1.5mm, and the first rectangular slot, the second rectangular slot, the third rectangular slot, the first gap, the fourth rectangular slot, the first radiating element and the second radiating element are respectively formed by etching process.
3. The UHF RFID tag antenna based on the microstrip structure as claimed in claim 1, wherein the length of the dielectric substrate along the left and right direction is 73mm, and the length along the front and back direction is 24 mm; the length of the first rectangular groove along the left-right direction is 8mm, and the length of the first rectangular groove along the front-back direction is 2 mm; the length of the second rectangular groove along the left-right direction is 37mm, and the length of the second rectangular groove along the front-back direction is 18 mm; the length of the third rectangular groove along the left-right direction is 8mm, and the length of the third rectangular groove along the front-back direction is 2 mm; the length of the first rectangular metal block along the left-right direction is 13.75mm, and the length of the first rectangular metal block along the front-back direction is 2.5 mm; the length of the second rectangular metal block along the left-right direction is 6mm, and the length of the second rectangular metal block along the front-back direction is 2 mm; the length of the third rectangular metal block along the left-right direction is 6mm, and the length of the third rectangular metal block along the front-back direction is 2 mm; the length of the fourth rectangular metal block along the left-right direction is 10mm, and the length of the fourth rectangular metal block along the front-back direction is 2 mm; the length of the fifth rectangular metal block along the left-right direction is 2.5mm, and the length of the fifth rectangular metal block along the front-back direction is 16 mm; the length of the sixth rectangular metal block along the left-right direction is 2mm, and the length of the sixth rectangular metal block along the front-back direction is 4 mm; the length of the seventh rectangular metal block along the left-right direction is 2mm, and the length of the seventh rectangular metal block along the front-back direction is 6 mm; the length of the eighth rectangular metal block along the left-right direction is 2mm, and the length of the eighth rectangular metal block along the front-back direction is 2 mm; the distance between the left end surface of the fifth rectangular metal block and the left end surface of the second rectangular groove is 2mm, the distance between the left end surface of the seventh rectangular metal block and the right end surface of the fifth rectangular metal block is 4mm, the distance between the plane of the left end surface of the first rectangular groove and the plane of the left end surface of the medium substrate is 10mm, the distance between the front end surface of the first rectangular metal block and the front end surface of the second rectangular groove is 2mm, the distance between the rear end surface of the fourth rectangular metal block and the rear end surface of the second rectangular groove is 2mm, the distance between the rear end surface of the first rectangular metal block and the front end surface of the second rectangular metal block is 1.5mm, and the distance between the rear end surface of the second rectangular metal block and the front end surface of the third rectangular metal block is 2mm, the rear end face of the third rectangular metal block and the front end face of the fourth rectangular metal block are 2mm in distance, the length of the fourth rectangular groove in the left-right direction is 2mm, the length of the fourth rectangular groove in the front-back direction is 3mm, the length of the first gap in the left-right direction is 0.5mm, and the length of the first gap in the front-back direction is 2.5 mm.
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