CN212647516U - Novel dual-frequency smart card - Google Patents
Novel dual-frequency smart card Download PDFInfo
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- CN212647516U CN212647516U CN202021426959.9U CN202021426959U CN212647516U CN 212647516 U CN212647516 U CN 212647516U CN 202021426959 U CN202021426959 U CN 202021426959U CN 212647516 U CN212647516 U CN 212647516U
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Abstract
The utility model relates to a novel dual-frequency smart card, which comprises a rectangular high-frequency coil, a high-frequency chip, an ultrahigh-frequency chip and an ultrahigh-frequency microstrip antenna, wherein a PVC composite substrate is used as a PVC card base and is formed by hot-pressing and punching; the ultrahigh frequency microstrip antenna surrounded by the rectangular high frequency coil; the ultrahigh frequency microstrip antenna is provided with a high-frequency coupling position, and the high-frequency coupling position is used for reducing electromagnetic interference formed by the rectangular high-frequency coil and improving the electromagnetic performance of the surrounded ultrahigh frequency microstrip antenna. The electromagnetic induction type ultrahigh frequency antenna has the advantages of small mutual electromagnetic signal interference between the high frequency coil and the ultrahigh frequency antenna and good double-frequency identification and reading performance.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a radio frequency electronic tags technical field, concretely relates to novel support high frequency and hyperfrequency's dual-frenquency smart card.
[ background of the invention ]
Radio Frequency Identification (RFID) technology is a technology that realizes automatic Identification and wireless data transmission by means of backscatter and electromagnetic field coupling of Radio Frequency signals. In short, the object can be identified by using the radio frequency identification technology, and the operations of reading and writing data transmission, sharing, checking, positioning and the like can be performed on the object data. RFID is a non-contact automatic identification technology, and is widely used in some industries. Such as public transport, entrance guard, NFC and other fields.
With the progress of the scientific and technological society, the smart card becomes an indispensable part in our life, and the smart card is not only used for identification of public transportation, subway and entrance guard; meanwhile, the method is also greatly used in the aspects of asset management and remote reading. Most of the current bus cards and access cards use 13.56MHz high-frequency band and IEC14443 protocol standard. The ultra-high frequency band of 920MHz-925MHz and the ISO18000 protocol standard are mostly used in the market of the remote reading smart card. Therefore, how to make a dual-frequency multifunctional smart card which can satisfy both long-distance reading and short-distance reading is very necessary.
Most smart cards on the market today use RFID technology to achieve non-contact identification. And only single function integration of a single frequency band is supported, and multi-frequency band multifunctional integration cannot be met. Application No. 200920074591.1, patentee's mid-card smart card (shanghai) limited, utility model name "a dual-frequency smart card", discloses a dual-frequency smart card, which comprises a high-frequency antenna, an ultrahigh-frequency antenna, a high-frequency chip and an ultrahigh-frequency chip, wherein the high-frequency chip and the ultrahigh-frequency chip share one substrate; the high-frequency antenna and the ultrahigh-frequency antenna are respectively arranged on the front surface and the back surface of the base material; the ultrahigh frequency chip and the high frequency chip are arranged on the same side plane of the substrate, and the connection point of the high frequency antenna and the high frequency chip and the connection point of the ultrahigh frequency antenna and the ultrahigh frequency chip are also arranged on the same plane. Above utility model is that the tradition can satisfy the smart card of dual-frenquency function, can produce electromagnetic signal interference each other between its high frequency coil and the hyperfrequency antenna, reduces dual-frenquency and knows the reading performance. Therefore, it is very important that a novel dual-frequency smart card supporting high frequency and ultrahigh frequency can meet the above requirements.
[ Utility model ] content
The utility model aims at providing a mutual electromagnetic signal interference is little between high frequency coil and the hyperfrequency antenna, dual-frenquency knows the dual-frenquency smart card that reading performance is good.
In order to achieve the purpose, the technical scheme adopted by the utility model is a novel dual-frequency smart card, which comprises a rectangular high-frequency coil, a high-frequency chip, an ultrahigh frequency chip and an ultrahigh frequency microstrip antenna, wherein a PVC composite substrate is used as a PVC card base and is formed by hot-pressing and punching; the ultrahigh frequency microstrip antenna surrounded by the rectangular high frequency coil; the ultrahigh frequency microstrip antenna is provided with a high-frequency coupling position, and the high-frequency coupling position is used for reducing electromagnetic interference formed by the rectangular high-frequency coil and improving the electromagnetic performance of the surrounded ultrahigh frequency microstrip antenna.
The beneficial effect of design like this is: the upper and lower surrounding structures of the rectangular high-frequency coil and the ultrahigh-frequency microstrip antenna are perfectly integrated with the smart cards with two frequency bands; and the existence of the high-frequency coupling position effectively avoids electromagnetic interference formed by the rectangular high-frequency coil, and improves the performance of the surrounding ultrahigh-frequency microstrip antenna.
Preferably, the novel dual-frequency smart card works in a high frequency band of 13.56MHz and a super high frequency band of 860MHz to 960 MHz.
Preferably, the PVC card substrate includes a buried line layer and an inlay layer, the reverse side of the PVC card substrate inlay layer is located below the reverse side of the PVC card substrate buried line layer, and the rectangular high-frequency coil surrounds the ultrahigh-frequency microstrip antenna below; the rectangular high-frequency coil is welded on the front surface of the PVC card base buried layer through a winding spot, and the high-frequency chip is welded on the head and the tail of the rectangular high-frequency coil by using soldering tin; the ultrahigh frequency microstrip antenna is covered on the PVC card base in an aluminum etching mode, is fixed on the front surface of the PVC card base inlay layer through manual spot welding by slitting, and the ultrahigh frequency chip is bound on the ultrahigh frequency microstrip antenna through the panther equipment.
Preferably, the ultrahigh frequency microstrip antenna is shaped like a rectangle with a notch, and comprises a first microstrip rectangular slot, a rectangular microstrip coupling ring, a second microstrip rectangular slot, a high frequency coupling position and a third microstrip rectangular slot; the high-frequency coupling position is located at the lower left corner of the ultrahigh-frequency microstrip antenna, the first microstrip rectangular slot is close to the left edge of the ultrahigh-frequency microstrip antenna, the second microstrip rectangular slot is close to the right edge of the ultrahigh-frequency microstrip antenna, the third microstrip rectangular slot is located at the left side of the second microstrip rectangular slot, the opening directions are opposite, and the rectangular microstrip coupling ring is located at the center of the ultrahigh-frequency microstrip antenna.
The beneficial effect of design like this is: the first micro-strip rectangular slot, the second micro-strip rectangular slot and the third micro-strip rectangular slot jointly adjust the resonance point of the ultra-high frequency micro-strip antenna, and compensate resonance deviation of the ultra-high frequency micro-strip antenna caused by the rectangular high-frequency coil.
Preferably, the ultrahigh frequency microstrip antenna further comprises an inverted U-shaped microstrip patch and an inverted U-shaped microstrip opening; the inverted U-shaped microstrip opening is separated from the rectangular microstrip coupling ring and has a downward opening; the inverted U-shaped microstrip patch is close to the third microstrip rectangular slot and the U-shaped microstrip opening, and the opening faces downwards.
The beneficial effect of design like this is: the impedance matching of the ultrahigh frequency microstrip antenna can be adjusted by the area size of the opening of the inverted U-shaped microstrip and the position of the patch of the inverted U-shaped microstrip; the impedance generated by the rectangular high-frequency coil is disturbed.
Preferably, the ultrahigh frequency microstrip antenna is shaped like a rectangle with a gap, the length of the rectangle is 60 +/-1 mm, and the width of the rectangle is 31 +/-1 mm; the high-frequency coupling bit length is 10 +/-2 mm, the width is 8 +/-2 mm, and the high-frequency coupling bit length is positioned at the lower left corner of the ultrahigh-frequency microstrip antenna and is 3 +/-1 mm away from the high-frequency chip.
The beneficial effect of design like this is: the high-frequency coupling position and the high-frequency chip keep 3mm of offset position, and electromagnetic interference of the rectangular high-frequency coil to the ultrahigh-frequency microstrip antenna is perfectly avoided.
Preferably, the length of the first microstrip rectangular slot is 21 ± 1mm, the width of the first microstrip rectangular slot is 3 ± 0.5mm, and the distance from the left edge of the ultrahigh frequency microstrip antenna is 8 ± 1 mm; the length of the rectangular microstrip coupling ring is 16 +/-2 mm, the width of the rectangular microstrip coupling ring is 7 +/-2 mm, and the rectangular microstrip coupling ring is 5 +/-1 mm away from the upper edge of the ultrahigh frequency microstrip antenna; the second microstrip rectangular slotThe length is 17 +/-1 mm, the width is 3.5 +/-0.5 mm, and the distance from the right edge of the ultrahigh frequency microstrip antenna is 5 +/-0.5 mm; the length of the third microstrip rectangular slot is 20 +/-1 mm, the width of the third microstrip rectangular slot is 3.5 +/-0.5 mm, and the distance between the third microstrip rectangular slot and the right edge of the ultrahigh frequency microstrip antenna is 13 +/-2 mm; the inverted U-shaped microstrip patch is shaped like a rectangle with the length of 20 +/-2 mm, the width of 6 +/-1 mm, the length of 16 +/-2 mm and the width of 4 +/-1 mm, and forms an inverted U-shaped microstrip patch, the distance between the microstrip patch and the third microstrip rectangular slot is 0.5mm, and the distance between the microstrip patch and the inverted U-shaped microstrip opening is 1 mm; the inverted U-shaped microstrip opening is similar to an inverted U-shaped structure with the length of 5 +/-2 mm and the width of 4 +/-1 mm, is positioned at the center of 1mm above the inverted U-shaped microstrip patch, and has the area of 22.5mm2。
Preferably, the rectangular high-frequency coil is shaped like a rectangle with the length of 80mm and the width of 44mm, the number of turns of the coil is 4, the distance between every two turns is 0.43mm, the diameter of the coil is 0.01mm, and the coil is made of copper wire.
The beneficial effect of design like this is: the antenna is an optimal size design, electromagnetic signal interference generated between the high-frequency coil and the ultrahigh-frequency antenna is effectively blocked, and the dual-frequency identification and reading performance is greatly improved.
[ description of the drawings ]
Fig. 1 is a perspective view of a novel dual-frequency smart card.
Fig. 2 is a perspective view of a novel dual-frequency smart card ultrahigh frequency microstrip antenna.
Fig. 3 is a perspective view of a rectangular high-frequency coil of a novel dual-frequency smart card.
The reference numerals and components referred to in the drawings are as follows:
1. the device comprises a PVC card base, 2, a rectangular high-frequency coil, 3, a high-frequency chip, 4, an ultrahigh-frequency chip and 5, an ultrahigh-frequency microstrip antenna;
50. the microstrip patch antenna comprises a first microstrip rectangular slot, a rectangular microstrip coupling ring, a second microstrip rectangular slot, a high-frequency coupling position 53, an inverted U-shaped microstrip patch, an inverted U-shaped microstrip opening, a third microstrip rectangular slot and a fourth microstrip rectangular slot, wherein the first microstrip rectangular slot is 51, the rectangular microstrip coupling ring is 52, the second microstrip rectangular slot is 54, the inverted U-shaped microstrip patch is 55, and the third microstrip rectangular slot is 56.
[ detailed description ] embodiments
The invention will be further described with reference to the following examples and with reference to the accompanying drawings.
Example one
The embodiment realizes a novel dual-frequency smart card, in particular to a novel dual-frequency smart card supporting high frequency and ultrahigh frequency.
A novel dual-frequency smart card is characterized by comprising a rectangular high-frequency coil, a high-frequency chip, an ultrahigh-frequency chip and an ultrahigh-frequency microstrip antenna; the structure is simple, and the PVC card base is made of the PVC composite base material 1 through hot-pressing and punching.
Fig. 1 is a perspective view of a novel dual-frequency smart card. As shown in FIG. 1, the novel dual-frequency smart card of the present embodiment operates in the ultra-high frequency band of 860MHz to 960MHz and the high frequency band of 13.56MHz, and has a length of 86mm, a width of 54mm, and a thickness of 1 mm. The rectangular high-frequency coil is spot-welded on the front surface of the PVC card base buried layer through a winding wire, and the high-frequency chip is welded on the head and the tail of the rectangular high-frequency coil by using soldering tin. The ultrahigh frequency chip is bound on the ultrahigh frequency microstrip antenna through the panther device, and the ultrahigh frequency microstrip antenna is fixed on the front surface of the PVC card base inlay layer through manual spot welding by slitting; the lower left corner of the ultrahigh frequency microstrip antenna is provided with a high-frequency coupling position with the length of 10 +/-2 mm and the width of 8 +/-2 mm, and the upper edge of the high-frequency coupling position is 3 +/-1 mm away from the upper edge of the high-frequency chip. The reverse side of the PVC card base inlay layer is positioned below the reverse side of the PVC card base thread burying layer. The rectangular high-frequency coil surrounds the ultrahigh-frequency microstrip antenna below. The rectangular high-frequency coil and the upper and lower surrounding structures of the ultrahigh-frequency microstrip antenna are perfectly integrated with the smart cards with two frequency bands; and the existence of the high-frequency coupling position effectively avoids the electromagnetic interference formed by the rectangular high-frequency coil, and improves the performance of the surrounded ultrahigh-frequency microstrip antenna.
Fig. 3 is a perspective view of a rectangular high-frequency coil of a novel dual-frequency smart card. As shown in fig. 3, the rectangular high-frequency coil is shaped like a rectangle with a length of 80mm and a width of 44mm, the number of turns of the coil is 4, the distance between every two turns is 0.43mm, the diameter of the coil is 0.01mm, and the coil is made of copper wire; and the rectangular high-frequency coil is spot-welded on the front surface of the PVC card base buried layer through a winding wire. The high-frequency chip is welded on the head and the tail of the rectangular high-frequency coil by using soldering tin, the length of the high-frequency chip is 8mm, and the width of the high-frequency chip is 6 mm; the high-frequency electrical property of the novel dual-frequency smart card is realized. The reverse side of the PVC card base buried line layer is positioned on the PVC card base inlay layer.
Fig. 2 is a perspective view of a novel dual-frequency smart card ultra-high frequency microstrip antenna. As shown in fig. 2, the ultrahigh frequency microstrip antenna is composed of a first microstrip rectangular slot, a rectangular microstrip coupling ring, a second microstrip rectangular slot, a high frequency coupling position, an inverted U-shaped microstrip patch, an inverted U-shaped microstrip opening, and a third microstrip rectangular slot, and is shaped like a rectangle with a gap, the length of which is 60 ± 1mm, and the width of which is 31 ± 1 mm. The ultrahigh frequency microstrip antenna is covered on the PVC card base 1 in an aluminum etching mode and fixed on the front surface of the PVC card base inlay layer through manual spot welding by slitting; the lower left corner of the ultrahigh frequency microstrip antenna is provided with a high-frequency coupling position with the length of 10 +/-2 mm and the width of 8 +/-2 mm, and the upper edge of the high-frequency coupling position is 3 +/-1 mm away from the upper edge of the high-frequency chip.
The length of the first microstrip rectangular slot is 21 +/-1 mm, the width of the first microstrip rectangular slot is 3 +/-0.5 mm, and the distance between the first microstrip rectangular slot and the left edge of the ultrahigh frequency microstrip antenna is 8 +/-1 mm; the length of the rectangular microstrip coupling ring is 16 +/-2 mm, the width of the rectangular microstrip coupling ring is 7 +/-2 mm, and the distance between the rectangular microstrip coupling ring and the upper edge of the ultrahigh frequency microstrip antenna is 5 +/-1 mm; the length of the second micro-strip rectangular slot is 17 +/-1 mm, the width of the second micro-strip rectangular slot is 3.5 +/-0.5 mm, and the distance between the second micro-strip rectangular slot and the right edge of the ultrahigh frequency micro-strip antenna is 5 +/-0.5 mm; the length of the third microstrip rectangular slot is 20 +/-1 mm, the width of the third microstrip rectangular slot is 3.5 +/-0.5 mm, and the distance between the third microstrip rectangular slot and the right edge of the ultrahigh frequency microstrip antenna is 13 +/-2 mm. The first microstrip rectangular slot, the second microstrip rectangular slot and the third microstrip rectangular slot jointly adjust the resonance point of the ultrahigh frequency microstrip antenna, and compensate resonance offset of the ultrahigh frequency microstrip antenna caused by the rectangular high-frequency coil.
The high-frequency coupling bit length is 10 +/-2 mm, the width is 8 +/-2 mm, and the high-frequency coupling bit length is positioned at the lower left corner of the ultrahigh-frequency microstrip antenna 5; the upper edge of the high-frequency coupling position is 3 +/-1 mm away from the high-frequency chip. The high-frequency coupling position and the high-frequency chip keep a 3mm offset position, and electromagnetic interference of the rectangular high-frequency coil on the ultrahigh-frequency microstrip antenna is perfectly avoided. The ultrahigh frequency chip is bound on the ultrahigh frequency microstrip antenna through a panther machine, so that the ultrahigh frequency electrical property of the novel dual-frequency smart card is realized.
The inverted U-shaped microstrip patch is shaped like a rectangle with the length of 20 +/-2 mm and the width of 6 +/-1 mm, and a rectangle with the length of 16 +/-2 mm and the width of 4 +/-1 mm is subtracted from the interior of the rectangle to form the inverted U-shaped microstrip patch; the distance between the inverted U-shaped microstrip patch and the third microstrip rectangular slot is 0.5mm, and the distance between the inverted U-shaped microstrip patch and the inverted U-shaped microstrip opening is 1 mm. The inverted U-shaped microstrip opening is similar to an inverted U-shaped structure with the length of 5 +/-2 mm and the width of 4 +/-1 mm, is positioned at the center of 1mm above the inverted U-shaped microstrip patch, and has the area of 22.5mm2. The impedance matching of the ultrahigh frequency microstrip antenna can be adjusted by the area of the opening of the inverted U-shaped microstrip and the position of the patch of the inverted U-shaped microstrip; the impedance generated by the rectangular high-frequency coil is obstructed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and additions can be made without departing from the principles of the present invention, and these improvements and additions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A novel dual-frequency smart card comprises a rectangular high-frequency coil (2), a high-frequency chip (3), an ultrahigh-frequency chip (4) and an ultrahigh-frequency microstrip antenna (5), wherein a PVC composite substrate is used as a PVC card base (1) and is formed by hot-pressing and punching; the method is characterized in that: the ultrahigh frequency microstrip antenna (5) is surrounded by the rectangular high frequency coil (2); the ultrahigh frequency microstrip antenna (5) is provided with a high frequency coupling position (53), and the high frequency coupling position (53) is used for reducing electromagnetic interference formed by the rectangular high frequency coil (2) and improving the electromagnetic performance of the surrounded ultrahigh frequency microstrip antenna (5).
2. A novel dual-frequency smart card as claimed in claim 1, wherein: the novel dual-frequency smart card works in a high-frequency band of 13.56MHz and an ultrahigh-frequency band of 860MHz to 960 MHz.
3. A novel dual-frequency smart card as claimed in claim 1, wherein: the PVC card base (1) comprises a wire burying layer and an inlay layer, the reverse side of the inlay layer of the PVC card base (1) is positioned below the reverse side of the wire burying layer of the PVC card base (1), and the rectangular high-frequency coil (2) surrounds the ultrahigh-frequency microstrip antenna (5) below; the rectangular high-frequency coil (2) is welded on the front surface of a buried wire layer of the PVC card base (1) through a winding spot welding mode, and the high-frequency chip (3) is welded on the head and the tail of the rectangular high-frequency coil (2) through soldering tin; the ultrahigh frequency microstrip antenna (5) is covered on the PVC card base (1) in an aluminum etching mode, fixed on the front surface of the inlay layer of the PVC card base (1) through manual slitting and spot welding, and the ultrahigh frequency chip (4) is bound on the ultrahigh frequency microstrip antenna (5) through the panther equipment.
4. A novel dual-frequency smart card as claimed in claim 3, wherein: the ultrahigh frequency microstrip antenna (5) is similar to a rectangle with a notch and comprises a first microstrip rectangular slot (50), a rectangular microstrip coupling ring (51), a second microstrip rectangular slot (52), a high frequency coupling position (53) and a third microstrip rectangular slot (56); the high-frequency coupling position (53) is located at the lower left corner of the ultrahigh-frequency microstrip antenna (5), the first microstrip rectangular slot (50) is close to the left edge of the ultrahigh-frequency microstrip antenna (5), the second microstrip rectangular slot (52) is close to the right edge of the ultrahigh-frequency microstrip antenna (5), the third microstrip rectangular slot (56) is located at the left side of the second microstrip rectangular slot (52) and opposite in opening direction, and the rectangular microstrip coupling ring (51) is located at the central position of the ultrahigh-frequency microstrip antenna (5).
5. A novel dual-frequency smart card as claimed in claim 4, wherein: the ultrahigh frequency microstrip antenna (5) further comprises an inverted U-shaped microstrip patch (54) and an inverted U-shaped microstrip opening (55); the inverted U-shaped microstrip opening (55) and the rectangular microstrip coupling ring (51) are separated and have downward openings; the inverted U-shaped microstrip patch (54) is adjacent to the third microstrip rectangular slot (56) and the U-shaped microstrip opening (55), and the opening faces downwards.
6. A novel dual-frequency smart card as claimed in claim 5, wherein: the ultrahigh frequency microstrip antenna (5) is shaped like a rectangle with a gap, the length of the rectangle is 60 +/-1 mm, and the width of the rectangle is 31 +/-1 mm; the length of the high-frequency coupling position (53) is 10 +/-2 mm, the width of the high-frequency coupling position is 8 +/-2 mm, and the high-frequency coupling position is positioned at the lower left corner of the ultrahigh-frequency microstrip antenna (5) and is 3 +/-1 mm away from the high-frequency chip (3).
7. A novel dual-frequency smart card as claimed in claim 6, wherein: the length of the first microstrip rectangular slot (50) is 21 +/-1 mm, the width of the first microstrip rectangular slot is 3 +/-0.5 mm, and the distance from the first microstrip rectangular slot to the left edge of the ultrahigh frequency microstrip antenna (5) is 8 +/-1 mm; the length of the rectangular microstrip coupling ring (51) is 16 +/-2 mm, the width of the rectangular microstrip coupling ring is 7 +/-2 mm, and the rectangular microstrip coupling ring is 5 +/-1 mm away from the upper edge of the ultrahigh frequency microstrip antenna (5); the length of the second microstrip rectangular slot (52) is 17 +/-1 mm, the width of the second microstrip rectangular slot is 3.5 +/-0.5 mm, and the distance from the second microstrip rectangular slot to the right edge of the ultrahigh frequency microstrip antenna (5) is 5 +/-0.5 mm; the length of the third microstrip rectangular slot (56) is 20 +/-1 mm, the width of the third microstrip rectangular slot is 3.5 +/-0.5 mm, and the distance from the third microstrip rectangular slot to the right edge of the ultrahigh frequency microstrip antenna (5) is 13 +/-2 mm; the inverted U-shaped microstrip patch (54) is shaped like a rectangle with the length of 20 +/-2 mm, the width of 6 +/-1 mm, the length of 16 +/-2 mm and the width of 4 +/-1 mm, so that an inverted U-shaped microstrip patch is formed, the distance from the third microstrip rectangular slot (56) is 0.5mm, and the distance from the inverted U-shaped microstrip opening (55) is 1 mm; the inverted U-shaped microstrip opening (55) is shaped like an inverted U-shaped structure with the length of 5 +/-2 mm and the width of 4 +/-1 mm, is positioned at the center of 1mm above the inverted U-shaped microstrip patch (54), and the area of the inverted U-shaped microstrip opening (55) is 22.5mm2。
8. A novel dual-frequency smart card as claimed in claim 7, wherein: the rectangular high-frequency coil (2) is shaped like a rectangle with the length of 80mm and the width of 44mm, the number of turns of the coil is 4, the distance between every two turns is 0.43mm, the diameter of the coil is 0.01mm, and the coil is made of copper wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021426959.9U CN212647516U (en) | 2020-07-20 | 2020-07-20 | Novel dual-frequency smart card |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021426959.9U CN212647516U (en) | 2020-07-20 | 2020-07-20 | Novel dual-frequency smart card |
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| CN212647516U true CN212647516U (en) | 2021-03-02 |
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| CN202021426959.9U Active CN212647516U (en) | 2020-07-20 | 2020-07-20 | Novel dual-frequency smart card |
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