CN106252834B - Antenna and tag reading apparatus - Google Patents
Antenna and tag reading apparatus Download PDFInfo
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- CN106252834B CN106252834B CN201610812494.2A CN201610812494A CN106252834B CN 106252834 B CN106252834 B CN 106252834B CN 201610812494 A CN201610812494 A CN 201610812494A CN 106252834 B CN106252834 B CN 106252834B
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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
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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Abstract
The invention provides an antenna and a label reading device with the antenna, wherein the antenna of the anti-interference high-frequency RFID label reading device comprises: at least one pair of high frequency antenna loops; each high frequency antenna loop pair comprises: the antenna comprises a first high-frequency antenna loop and a second high-frequency antenna loop which is the same as the first high-frequency antenna loop, wherein the first high-frequency antenna loop and the second high-frequency antenna loop respectively comprise an initial section antenna, a loop section antenna and a termination section antenna, and the termination section antenna of the first high-frequency antenna loop is connected to the initial section antenna of the second high-frequency antenna; and the first high-frequency antenna loop generates a first resonant current when receiving the interference electromagnetic wave, the second high-frequency antenna loop generates a second resonant current when receiving the interference electromagnetic wave, and the current directions of the first resonant current and the second resonant current are opposite. According to the technical scheme, the interference of electromagnetic waves from the space to the antenna of the high-frequency RFID label reading device can be effectively inhibited, and the signal-to-noise ratio of the output signal of the antenna is improved.
Description
Technical Field
The invention relates to the technical field of radio frequency, in particular to an anti-interference antenna of high-frequency RFID (radio frequency identification) tag reading equipment, the high-frequency RFID tag reading equipment, an antenna of double-frequency RFID tag reading equipment and the double-frequency RFID tag reading equipment.
Background
At present, in the application of Radio Frequency Identification (RFID) in a high Frequency band, various electromagnetic waves from a far space interfere with RFID tag reading equipment through an antenna, so that the distance for reading the tag is greatly reduced. Generally, the RFID in the high frequency band operates at a frequency point of several MHz, such as 6.8MHz or 13.56MHz, and its interference mainly includes two aspects: one is the signal of the short wave broadcasting station; the other is alternating current, which is also subject to interference when the antenna of the RFID tag reading device is close to the ac power supply line. The existing high-frequency antenna is composed of a resonant loop, the resonant loop is formed by crossing a plurality of sections of coaxial lines or is formed by connecting a plurality of resonators in series, the resonators are formed by connecting single-core wires and capacitors in series, the resonant loop generally can only inhibit interference through the bandwidth limitation of the resonant loop or has no anti-interference capability directly, and the anti-interference means is single and the effect is not obvious.
Therefore, how to suppress the interference of electromagnetic waves from the space to the antenna of the high-frequency RFID tag reading apparatus, so as to improve the signal-to-noise ratio of the output signal of the antenna, is a technical problem to be solved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
Therefore, an object of the present invention is to provide a novel anti-interference antenna for a high-frequency RFID tag reading device, in which a pair of high-frequency antenna loops, which are formed by two high-frequency antenna loops having the same shape and size, is used as a basic antenna structure, so that electromagnetic waves from a distant space generate resonance currents having the same size and opposite current directions in the two high-frequency antenna loops, and the purpose of anti-interference is achieved, thereby improving the signal-to-noise ratio of an output signal of the antenna.
Another object of the present invention is to provide a high frequency RFID tag reading apparatus having the antenna.
It is a further object of the present invention to provide an antenna for a dual frequency RFID tag reading device.
Still another object of the present invention is to provide a dual-frequency RFID tag reading apparatus having the antenna.
To achieve at least one of the above objects, according to a first aspect of the present invention, there is provided an antenna of a high frequency RFID tag reading apparatus resistant to interference, comprising: at least one pair of high frequency antenna loops; each of the high frequency antenna loop pairs comprises: the antenna comprises a first high-frequency antenna loop and a second high-frequency antenna loop which is the same as the first high-frequency antenna loop, wherein the first high-frequency antenna loop comprises a first starting section antenna, a first loop section antenna and a first termination section antenna, the second high-frequency antenna loop comprises a second starting section antenna, a second loop section antenna and a second termination section antenna, and the first termination section antenna is connected to the second starting section antenna; and the first high-frequency antenna loop generates a first resonant current when receiving the interference electromagnetic wave, the second high-frequency antenna loop generates a second resonant current when receiving the interference electromagnetic wave, and the current directions of the first resonant current and the second resonant current are opposite.
The antenna of the anti-interference high-frequency RFID tag reading device comprises at least one high-frequency antenna loop pair, each high-frequency antenna loop pair comprises two identical high-frequency antenna loops, the terminal section antenna of the first high-frequency antenna loop is communicated with the initial section antenna of the second high-frequency antenna loop, namely, the same high-frequency antenna is wound to form a basic antenna structure (namely, the high-frequency antenna loop pair) comprising the two identical high-frequency antenna loops, the first high-frequency antenna loop and the second high-frequency antenna loop respectively generate resonant currents with opposite current directions when receiving uniform interference electromagnetic waves from a far space, the resonant currents generated by the two identical high-frequency antenna loops are equal, so that the resonant currents respectively generated by the interference electromagnetic waves in the two high-frequency antenna loops are mutually cancelled, and the high-frequency RFID tag reading device is close to the tag when the antenna of the high-frequency RFID tag reading device reads the high-frequency RFID tag, the generated resonant currents are not uniformly cancelled on the two high-frequency antenna loops, the signal sent by the tag can be received, the anti-interference high-frequency RFID tag reading device can achieve the aim of outputting anti-interference high-frequency RFID signals, and the high-frequency RFID tag reading device can simultaneously ensure that the high-frequency antenna loops can receive the high-frequency RFID tag signals.
The antenna of the anti-interference high-frequency RFID tag reading device according to the above embodiment of the present invention may further have the following technical features:
in the above technical solution, preferably, the method further includes: a receiving circuit; and the first start segment antenna of the first high frequency antenna loop and the second end segment antenna of the second high frequency antenna loop are connected to the receiving circuit.
In the technical scheme, a first starting section antenna of a first high-frequency antenna loop and a second ending section antenna of a second high-frequency antenna loop of each high-frequency antenna loop pair are connected to a receiving circuit so as to decode signals sent by the high-frequency RFID label.
In any of the above technical solutions, preferably, the at least one high-frequency antenna loop pair is a plurality of high-frequency antenna loop pairs.
In the technical scheme, in order to read the signals sent by the high-frequency RFID tag in a relatively large range, the antenna of the anti-interference high-frequency RFID tag reading device may be arranged to include a plurality of high-frequency antenna loop pairs.
In any of the above technical solutions, preferably, the plurality of pairs of high-frequency antenna loops are sequentially arranged side by side.
In the technical scheme, during specific layout, a plurality of high-frequency antenna loop pairs can be sequentially arranged side by side, namely, a second high-frequency antenna loop of a previous high-frequency antenna loop pair is adjacently arranged with a first high-frequency antenna loop of a subsequent high-frequency antenna loop pair, and so on, so as to read signals sent by the high-frequency RFID tag in a relatively large range.
In any of the above technical solutions, preferably, a space is provided between the first high-frequency antenna loop and the second high-frequency antenna loop in each of the high-frequency antenna loop pairs, and the space can accommodate the first high-frequency antenna loop or the second high-frequency antenna loop.
In the technical scheme, further when each high-frequency antenna loop pair is formed by winding, an interval capable of accommodating the first high-frequency antenna loop or the second high-frequency antenna loop can be reserved between the first high-frequency antenna loop and the second high-frequency antenna loop, so that diversified layout among the high-frequency antenna loop pairs is realized.
In any of the above-described aspects, preferably, the plurality of high-frequency antenna loop pairs are divided into a plurality of high-frequency antenna loop groups, each of the high-frequency antenna loop groups includes two high-frequency antenna loop pairs, and the first high-frequency antenna loop of a second high-frequency antenna loop pair of each of the high-frequency antenna loop groups is located in an interval between the first high-frequency antenna loop and the second high-frequency antenna loop of a first high-frequency antenna loop pair, and the second high-frequency antenna loop of the first high-frequency antenna loop pair is located in an interval between the first high-frequency antenna loop and the second high-frequency antenna loop of the second high-frequency antenna loop pair.
In this technical solution, further, a plurality of high frequency antenna loop pairs may be laid to group, so as to obtain a plurality of groups of high frequency antenna loop groups, and specifically, two high frequency antenna loop pairs may be laid in pairs, and the first high frequency antenna loop pair in the second high frequency antenna loop pair in each group may be laid in an interval of the first high frequency antenna loop pair in each group, and the second high frequency antenna loop pair in the first high frequency antenna loop pair may be laid in an interval of the second high frequency antenna loop pair, so as to read a signal sent by a high frequency RFID tag in a relatively large range, and ensure a relatively uniform reading distance, avoid a blind reading zone from occurring in an interval between the first high frequency antenna loop pair and the second high frequency antenna loop pair, and thereby avoid affecting a reading effect of a signal sent by the high frequency RFID tag.
In the above technical solution, when the plurality of high-frequency antenna loop pairs are grouped, other grouping manners may also be used, for example, every three high-frequency antenna loop pairs are grouped into one group, or every two high-frequency antenna loop pairs, every three high-frequency antenna loop pairs are grouped in an intersecting manner, and the like, then an interval between two high-frequency antenna loops in each high-frequency antenna loop pair may be larger at this time, so as to accommodate more high-frequency antenna loops.
In any of the above technical solutions, preferably, the first high-frequency antenna loop and the second high-frequency antenna loop have the same shape and size, and the shape of the first high-frequency antenna loop and the second high-frequency antenna loop includes a rectangle, a circle, or an ellipse.
In the technical scheme, the same first high-frequency antenna loop and the same second high-frequency antenna loop in each high-frequency antenna loop pair have the same shape and size, such as being rectangular, circular or elliptical, and the length and the width of the first high-frequency antenna loop and the length of the second high-frequency antenna loop are the same when the first high-frequency antenna loop and the second high-frequency antenna loop are both rectangular, and the radius of the first high-frequency antenna loop and the radius of the second high-frequency antenna loop are the same when the first high-frequency antenna loop and the second high-frequency antenna loop are both circular, so that the resonance currents generated in the two high-frequency antenna loops can be mutually offset, and the purpose of resisting interference is achieved; of course, it should be understood by those skilled in the art that the high-frequency antenna loop may have other shapes, such as a square shape, besides the above shape, and the purpose of canceling the generated resonant currents is achieved.
In any of the above technical solutions, preferably, the method further includes: and the closed annular conducting wire is positioned at the outer ring of the at least one high-frequency antenna loop pair.
In the technical scheme, in order to further reduce the interference of other external electromagnetic waves on the antenna of the anti-interference high-frequency RFID tag reading equipment when receiving high-frequency electromagnetic waves, a closed loop conductor can be arranged around the antenna to generate an anti-electromagnetic field to prevent the change of an external alternating electromagnetic field, so that the anti-interference capability of the antenna is further improved.
According to a second aspect of the present invention, there is provided a high frequency RFID tag reading apparatus, including the antenna of the anti-interference high frequency RFID tag reading apparatus according to any one of the above technical solutions, so that the high frequency RFID tag reading apparatus has all the beneficial effects of the antenna of the anti-interference high frequency RFID tag reading apparatus according to any one of the above technical solutions, and details thereof are not repeated herein.
According to a third aspect of the present invention, there is provided an antenna of a dual-frequency RFID tag reading apparatus, comprising: a low frequency loop antenna, and an antenna of the anti-jamming high frequency RFID tag reading device of any of the above technical solutions; the low-frequency loop antenna is connected to the transmitting circuit and used for transmitting low-frequency electromagnetic waves to the dual-frequency RFID tag so as to activate the dual-frequency RFID tag; and the antenna of the anti-interference high-frequency RFID tag reading equipment is positioned in an annular area surrounded by the low-frequency annular antenna and is used for receiving high-frequency electromagnetic waves sent by the double-frequency RFID tag.
In the technical scheme, the circle of low-frequency loop antenna is arranged on the outer ring of the antenna of the anti-interference high-frequency RFID tag reading equipment, so that the low-frequency electromagnetic wave emitted by the low-frequency loop antenna can activate the dual-frequency RFID tag, the high-frequency electromagnetic wave emitted by the dual-frequency RFID tag is received by the antenna of the anti-interference high-frequency RFID tag reading equipment, the anti-interference purpose can be achieved, and the signal to noise ratio of an output signal of the antenna is improved.
In the above technical solution, preferably, the method further includes: and the closed annular conducting wire is positioned on the outer ring of the low-frequency annular antenna.
In order to further reduce the interference of other external electromagnetic waves when the antenna of the whole dual-frequency RFID tag reading device receives high-frequency electromagnetic waves, a closed loop conductor can be arranged around the outer ring of the low-frequency loop antenna to generate a resistance electromagnetic field to prevent the change of an external alternating electromagnetic field, and the anti-interference capability of the antenna of the dual-frequency RFID tag reading device is improved.
According to a fourth aspect of the present invention, there is provided a dual-frequency RFID tag reading apparatus comprising the antenna of the dual-frequency RFID tag reading apparatus according to any one of the above technical solutions, and therefore, the dual-frequency RFID tag reading apparatus has all the advantageous effects of the antenna of the dual-frequency RFID tag reading apparatus according to the above technical solutions.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 shows a schematic block diagram of an antenna of a tamper resistant high frequency RFID tag reading device of an embodiment of the present invention;
FIG. 2 shows a schematic connection diagram of an antenna of a first embodiment of the anti-tamper high frequency RFID tag reading device of the present invention;
FIG. 3 shows a schematic connection diagram of an antenna of a tamper resistant high frequency RFID tag reading device of a second embodiment of the present invention;
FIG. 4 shows a schematic connection diagram of an antenna of a tamper resistant high frequency RFID tag reading device of a third embodiment of the present invention;
FIG. 5 shows a schematic connection diagram of an antenna of the dual-frequency RFID tag reading apparatus of the first embodiment of the present invention;
FIG. 6 shows a schematic connection diagram of an antenna of a dual-frequency RFID tag reading apparatus of a second embodiment of the present invention;
fig. 7 shows a connection diagram of an antenna of a dual-frequency RFID tag reading apparatus of a third embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The antenna of the high-frequency RFID tag reading apparatus resistant to interference according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 4.
As shown in fig. 1, the antenna of the anti-interference high frequency RFID tag reading device according to the embodiment of the present invention includes: at least one pair of high frequency antenna loops 10.
Wherein each of the high frequency antenna loop pairs 10 comprises: a first high frequency antenna loop 102 and a second high frequency antenna loop 104 identical to the first high frequency antenna loop 102, wherein the first high frequency antenna loop 102 comprises a first start segment antenna 1022, a first loop segment antenna 1024 and a first stop segment antenna 1026, the second high frequency antenna loop 104 comprises a second start segment antenna 1042, a second loop segment antenna 1044 and a second stop segment antenna 1046, and the first stop segment antenna 1026 is connected to the second start segment antenna 1042; and the first high frequency antenna loop 102 generates a first resonant current when receiving the interference electromagnetic wave, the second high frequency antenna loop 104 generates a second resonant current when receiving the interference electromagnetic wave, and the first resonant current and the second resonant current have opposite current directions.
The antenna of the anti-interference high-frequency RFID tag reading device comprises at least one high-frequency antenna loop pair 10, each high-frequency antenna loop pair 10 comprises two identical high-frequency antenna loops, and the terminal section antenna 1026 of the first high-frequency antenna loop 102 is communicated with the starting section antenna 1042 of the second high-frequency antenna loop 104, that is, the same high-frequency antenna is wound into a basic antenna structure (namely, the high-frequency antenna loop pair 10) comprising the two identical high-frequency antenna loops, and the first high-frequency antenna loop 102 and the second high-frequency antenna loop 104 respectively generate resonant currents with opposite current directions when receiving uniform interference electromagnetic waves from a far space, and the resonant currents generated by the interference electromagnetic waves in the two high-frequency antenna loops are equal in magnitude, so that the resonant currents generated by the interference electromagnetic waves in the two high-frequency antenna loops are mutually cancelled, and because the antenna of the high-frequency RFID tag reading device is close to the high-frequency RFID tag, the tag is unevenly generated on the two high-frequency antennas, the generated resonant currents are not all not cancelled, so that the signal-to-noise ratio of the anti-interference high-frequency RFID tag reading device can be received, and the high-frequency tag can be ensured.
Further, in the above embodiment, the same first high-frequency antenna loop 102 and second high-frequency antenna loop 104 in each high-frequency antenna loop pair 10 have the same shape and size, such as both being rectangular, circular or elliptical, and the length and width should be the same when both being rectangular, and the radius should be the same when both being circular, etc., so as to ensure that the resonant currents generated in the two high-frequency antenna loops can cancel each other out for the purpose of interference resistance; of course, it should be understood by those skilled in the art that the high-frequency antenna loop may have other shapes, such as a square shape, besides the above shape, and the purpose of canceling the generated resonant currents is achieved.
Further, as shown in fig. 2, the antenna of the anti-interference high-frequency RFID tag reading apparatus of the present invention further includes: a receiving circuit 20; and the first start segment antenna 1022 of the first high frequency antenna loop 102 and the second end segment antenna 1046 of the second high frequency antenna loop 104 are connected to the receiving circuit 20.
In this embodiment, the first start segment antenna 1022 of the first high frequency antenna loop 102 and the second stop segment antenna 1046 of the second high frequency antenna loop 104 of each high frequency antenna loop pair 10 are connected to the receiving circuit 20 for decoding signals emitted by the high frequency RFID tag.
Specifically, since the interfering electromagnetic waves come from a far space, the interfering electromagnetic waves passing through the two high-frequency antenna loops are uniform, and then according to faraday's law, the winding paths of the two high-frequency antenna loops cancel out the resonant currents generated by the electromagnetic waves passing through each high-frequency antenna loop in the same direction, that is, the current directions of the resonant currents generated by the received interfering electromagnetic waves at the first loop section antenna 1024 of the first high-frequency antenna loop 102 and the second loop section antenna 1044 of the second high-frequency antenna loop 104 are opposite and equal, and the current directions are as shown by arrows in fig. 2, then the resonant current generated by the interfering electromagnetic waves obtained by the receiving circuit 20 is close to zero; the high-frequency RFID label is close to the antenna of the anti-interference high-frequency RFID label reading device, the farthest distance is the same order of magnitude as the size of the antenna, electromagnetic wave signals sent by the high-frequency RFID label are not uniform on the two loops, therefore, resonance currents generated in the two loops by the electromagnetic wave signals of the high-frequency RFID label cannot be completely counteracted, and then the receiving circuit can receive the signals sent by the high-frequency RFID label, so that label information can be read successfully.
For example, when the high frequency RFID tag is located above one of the high frequency antenna loops, the electromagnetic wave signal of the high frequency RFID tag received by the other loop is weak, so that the induced current on the receiving circuit 20 is not completely cancelled; then, in particular in practical applications, the high frequency RFID tag may be read on one high frequency antenna loop or may also be read on two high frequency antenna loops.
In any of the above embodiments, the at least one high frequency antenna loop pair 10 is a plurality of high frequency antenna loop pairs 10.
In this technical solution, in order to read the signal emitted by the high-frequency RFID tag in a relatively large range, the antenna of the anti-interference high-frequency RFID tag reading apparatus may be arranged to include a plurality of high-frequency antenna loop pairs 10.
Further, when the plurality of high-frequency antenna loop pairs 10 are specifically arranged, it can be realized by the following specific embodiments.
The first embodiment is as follows: the plurality of high-frequency antenna loop pairs 10 are arranged side by side in sequence.
In the technical scheme, during specific layout, a plurality of high-frequency antenna loop pairs can be sequentially arranged side by side, namely, a second high-frequency antenna loop of a previous high-frequency antenna loop pair is adjacently arranged with a first high-frequency antenna loop of a subsequent high-frequency antenna loop pair, and so on, so as to read signals sent by the high-frequency RFID tag in a relatively large range.
Example two: a space 106 is provided between the first high-frequency antenna loop 102 and the second high-frequency antenna loop 104 in each of the high-frequency antenna loop pairs 10, and the space 106 can accommodate the first high-frequency antenna loop 102 or the second high-frequency antenna loop 104; that is, when each high-frequency antenna loop pair 10 is formed by winding, a space 106 capable of accommodating the first high-frequency antenna loop 102 or the second high-frequency antenna loop 104 may be reserved between the first high-frequency antenna loop 102 and the second high-frequency antenna loop 104, so as to implement diversified layout between multiple high-frequency antenna loop pairs 10.
Further, the plurality of high-frequency antenna loop pairs are divided into a plurality of high-frequency antenna loop groups, each of the high-frequency antenna loop groups includes two of the high-frequency antenna loop pairs, and the first high-frequency antenna loop of a second high-frequency antenna loop pair of each of the high-frequency antenna loop groups is located within an interval between the first high-frequency antenna loop and the second high-frequency antenna loop of a first high-frequency antenna loop pair, and the second high-frequency antenna loop of the first high-frequency antenna loop pair is located within an interval between the first high-frequency antenna loop and the second high-frequency antenna loop of the second high-frequency antenna loop pair; the arrangement of the plurality of high-frequency antenna loop pairs can be grouped to obtain a plurality of groups of high-frequency antenna loop groups, specifically, the arrangement can be performed in a pairwise manner, and the groups are crossed, namely, a first high-frequency antenna loop in a second high-frequency antenna loop pair in each group is arranged in an interval of the first high-frequency antenna loop pair in each group, and a second high-frequency antenna loop in the first high-frequency antenna loop pair is arranged in an interval of the second high-frequency antenna loop pair, so that signals sent by the high-frequency RFID label can be read in a larger range, a more uniform reading distance is ensured, a reading blind zone is prevented from occurring in the interval between the first high-frequency antenna loop and the second high-frequency antenna loop of each high-frequency antenna loop pair, and the influence on the reading effect of the signals sent by the high-frequency RFID label is avoided. Wherein, reading the blind area refers to: when the high-frequency RFID tag is positioned at the interval between the two high-frequency antenna loops, the difference between the magnitudes of the resonant currents in the two high-frequency antenna loops is not large, so that the resonant currents are counteracted seriously, and the distance for reading the high-frequency RFID tag is greatly reduced, so that the distance for reading the high-frequency RFID tag between the two high-frequency antenna loops is uneven, the closer to the middle of the two high-frequency RFID loops, the lower the reading distance is, and even a blind area is generated.
Specifically, as shown in the embodiment shown in fig. 3, the antenna of the anti-jamming high-frequency RFID tag reading apparatus includes two pairs of high-frequency antenna loops, which are arranged in a cross manner, and a first high-frequency antenna loop, a second high-frequency antenna loop and a first receiving circuit are combined, a third high-frequency antenna loop, a fourth high-frequency antenna loop and a second receiving circuit are combined, and the third high-frequency antenna loop is located between the first high-frequency antenna loop and the second high-frequency antenna loop, and the second high-frequency antenna loop is located between the third high-frequency antenna loop and the fourth high-frequency antenna loop; however, as shown in the embodiment shown in fig. 4, the antenna of the anti-interference high-frequency RFID tag reading apparatus includes four high-frequency antenna loop pairs, which are arranged side by side after being arranged in a pairwise crossing manner, that is, two antennas of the anti-interference high-frequency RFID tag reading apparatus shown in fig. 3 are arranged side by side, and the crossing arrangement situation between each high-frequency antenna loop pair is similar to that of the embodiment shown in fig. 3, and is not described again.
In other embodiments of the present invention, when the plurality of high-frequency antenna loop pairs are grouped, the grouping may be in other grouping manners, for example, every three high-frequency antenna loop pairs are grouped into one group, or every two high-frequency antenna loop pairs, every three high-frequency antenna loop pairs are grouped in an intersecting manner, and the like, at this time, the interval between two high-frequency antenna loops in each high-frequency antenna loop pair may be larger to accommodate more high-frequency antenna loops.
In any of the above embodiments, further comprising: a closed loop conductor (not shown) located at the outer perimeter of the at least one pair of high frequency antenna loops.
In the technical scheme, in order to further reduce the interference of other external electromagnetic waves on the antenna of the anti-interference high-frequency RFID tag reading equipment when receiving high-frequency electromagnetic waves, a closed loop conductor can be arranged around the antenna to generate an anti-electromagnetic field to prevent the change of an external alternating electromagnetic field, so that the anti-interference capability of the antenna is further improved.
Through the embodiment, on one hand, a larger reading range can be covered, and on the other hand, reading blind areas can be avoided.
As an embodiment of the present invention, the antenna of the anti-interference high-frequency RFID tag reading apparatus in any of the above embodiments may be applied to a high-frequency RFID tag reading apparatus, and therefore, the high-frequency RFID tag reading apparatus has all the advantageous effects of the antenna of the anti-interference high-frequency RFID tag reading apparatus described in any of the above embodiments.
As an embodiment of the present invention, the antenna of the anti-interference high frequency RFID tag reading apparatus in any one of the above embodiments may be applied to an antenna of a dual frequency RFID tag reading apparatus, that is, a low frequency loop antenna 50 is arranged at the periphery of the antenna of the anti-interference high frequency RFID tag reading apparatus in any one of the above embodiments, wherein the low frequency loop antenna 50 is connected to a transmitting circuit 60 for transmitting low frequency electromagnetic waves to a dual frequency RFID tag to activate the dual frequency RFID tag; the antenna of the anti-interference high-frequency RFID tag reading device is located in an annular area surrounded by the low-frequency loop antenna 50, and is configured to receive the high-frequency electromagnetic wave emitted by the dual-frequency RFID tag.
In the technical scheme, a circle of low-frequency loop antenna 50 is arranged on the outer ring of the antenna of the anti-interference high-frequency RFID tag reading equipment, so that the dual-frequency RFID tag can be activated through the low-frequency electromagnetic wave emitted by the low-frequency loop antenna 50, then the high-frequency electromagnetic wave emitted by the dual-frequency RFID tag is received through the antenna of the anti-interference high-frequency RFID tag reading equipment, the anti-interference purpose can be achieved, and the signal to noise ratio of the output signal of the antenna is improved.
Specific embodiments of the antenna of the dual-frequency RFID tag reading device corresponding to the antenna of the tamper-resistant high-frequency RFID tag reading device shown in fig. 2, 3 and 4 are shown in fig. 5, 6 and 7, respectively, that is, a loop of low-frequency loop antenna 50 is arranged at the outer ring of the antenna of the tamper-resistant high-frequency RFID tag reading device shown in fig. 2, 3 and 4; further, the shape of the low frequency loop antenna 50 may be consistent with the shape of the high frequency antenna loop.
In any of the above embodiments, preferably, the method further comprises: and a closed loop conductor (not shown) is positioned at the outer circle of the low-frequency loop antenna.
In order to further reduce the interference of other external electromagnetic waves when the antenna of the whole dual-frequency RFID tag reading device receives high-frequency electromagnetic waves, a closed loop conductor can be arranged around the outer ring of the low-frequency loop antenna to generate a resistance electromagnetic field to prevent the change of an external alternating electromagnetic field, and the anti-interference capability of the antenna of the dual-frequency RFID tag reading device is improved.
As an embodiment of the present invention, the antenna of the dual-frequency RFID tag reading apparatus in the above-described embodiment may be applied to the dual-frequency RFID tag reading apparatus, and therefore, the dual-frequency RFID tag reading apparatus has all the advantages of the antenna of the dual-frequency RFID tag reading apparatus according to the above technical solution.
The technical scheme of the invention is explained in detail with the accompanying drawings, and the high-frequency antenna loop pair formed by two high-frequency antenna loops with the same shape and size is used as a basic antenna structure, so that the electromagnetic waves from a far space generate resonance currents with the same size and the opposite current directions in the two high-frequency antenna loops to be offset, the purpose of resisting interference is achieved, and the signal-to-noise ratio of the output signals of the antenna is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An antenna for an anti-jamming, high frequency RFID tag reading device, comprising: at least one pair of high frequency antenna loops;
each of the high frequency antenna loop pairs comprises: the antenna comprises a first high-frequency antenna loop and a second high-frequency antenna loop which is the same as the first high-frequency antenna loop, wherein the first high-frequency antenna loop comprises a first starting section antenna, a first loop section antenna and a first termination section antenna, the second high-frequency antenna loop comprises a second starting section antenna, a second loop section antenna and a second termination section antenna, and the first termination section antenna is connected to the second starting section antenna; and
the first high-frequency antenna loop generates a first resonant current when receiving interference electromagnetic waves, the second high-frequency antenna loop generates a second resonant current when receiving the interference electromagnetic waves, the first resonant current and the second resonant current are opposite in current direction and equal in current magnitude, and the first resonant current and the second resonant current can be mutually offset;
the at least one high-frequency antenna loop pair is a plurality of high-frequency antenna loop pairs;
a space is provided between the first high-frequency antenna loop and the second high-frequency antenna loop in each of the high-frequency antenna loop pairs, and the space can accommodate the first high-frequency antenna loop or the second high-frequency antenna loop.
2. The antenna for an interference-free, high frequency RFID tag reading device of claim 1, further comprising: a receiving circuit; and
the first start segment antenna of the first high frequency antenna loop and the second end segment antenna of the second high frequency antenna loop are connected to the receiving circuit.
3. The antenna for a tamper resistant high frequency RFID tag reading apparatus of claim 1 or 2, wherein the plurality of pairs of high frequency antenna loops are arranged side by side in sequence.
4. The antenna of an interference-resistant high-frequency RFID tag reading device according to claim 1 or 2,
the plurality of high-frequency antenna loop pairs are divided into a plurality of high-frequency antenna loop groups, each of the high-frequency antenna loop groups includes two of the high-frequency antenna loop pairs, and the first high-frequency antenna loop of a second high-frequency antenna loop pair of each of the high-frequency antenna loop groups is located within an interval between the first high-frequency antenna loop and the second high-frequency antenna loop of a first high-frequency antenna loop pair, and the second high-frequency antenna loop of the first high-frequency antenna loop pair is located within an interval between the first high-frequency antenna loop and the second high-frequency antenna loop of the second high-frequency antenna loop pair.
5. The antenna for a tamper resistant high frequency RFID tag reading device according to claim 1 or 2, wherein the first and second high frequency antenna loops are identical in shape and size, wherein the shape of the first and second high frequency antenna loops comprises a rectangle, a circle or an ellipse.
6. The antenna for a tamper resistant high frequency RFID tag reading device of claim 5, further comprising:
and the closed annular conducting wire is positioned at the outer ring of the at least one high-frequency antenna loop pair.
7. A high frequency RFID tag reading apparatus, comprising: an antenna for an interference resistant high frequency RFID tag reading device as claimed in any one of claims 1 to 6.
8. An antenna for a dual-frequency RFID tag reading device, comprising: a low frequency loop antenna, and an antenna of the tamper resistant high frequency RFID tag reading device of any of claims 1 to 5;
the low-frequency loop antenna is connected to the transmitting circuit and used for transmitting low-frequency electromagnetic waves to the dual-frequency RFID tag so as to activate the dual-frequency RFID tag;
and the antenna of the anti-interference high-frequency RFID tag reading equipment is positioned in an annular area surrounded by the low-frequency annular antenna and is used for receiving high-frequency electromagnetic waves sent by the double-frequency RFID tag.
9. The antenna of the dual-band RFID tag reading device of claim 8, further comprising:
and the closed annular conducting wire is positioned on the outer ring of the low-frequency annular antenna.
10. A dual-frequency RFID tag reading apparatus, characterized by comprising an antenna of the dual-frequency RFID tag reading apparatus according to claim 8 or 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812494.2A CN106252834B (en) | 2016-09-09 | 2016-09-09 | Antenna and tag reading apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812494.2A CN106252834B (en) | 2016-09-09 | 2016-09-09 | Antenna and tag reading apparatus |
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| CN106252834A CN106252834A (en) | 2016-12-21 |
| CN106252834B true CN106252834B (en) | 2022-11-18 |
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| CN106252834A (en) | 2016-12-21 |
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