CN1959700A - Method for designing electronic labels in winding form prepared through a single molding - Google Patents

Abstract

A method for forming coil shaped electronic countermark by one-time preparation includes applying single circle or designing chip welding pads to chip diagonal line type or distributing said welding pads on long edge of chip to increase space between welding pads then using means of wring between two welding pads to realize one-time preparation of coil shaped electronic countermark.

Description

A kind of method for designing of coil shape electronic tag of the moulding of producing once

Technical field

The invention belongs to electronic technology field, relate to a kind of usefulness electronic tag method for designing cheaply.

Background technology

In recent years, automatic identifying method is in many service fields, aspect sale of goods and the logistics distribution, in commercial department, obtained popularizing fast and promoting in manufacturing enterprise and the material field of circulation.

Several years ago, bar code---paper tape has caused a revolution and has obtained widespread use in the recognition system field.Today, this bar code---paper tape can not satisfy people's demand under increasing situation.Though bar code is very cheap, its weak point is that storage capacity is little and can not rewrite.

A kind of technical best solution be with data storage in a silicon.In daily life, having the IC-card of arranging the contact (phone IC-card, bank card etc.) is the most general structure of electric data carrier.Yet concerning IC-card, in many cases, the connection of mechanical contact is insecure.Data between the reader under data carrier and one are carried out non-contact transmission with much flexible.According to the energy and the data transmission method that use, we are called radio-frequency recognition system (RFID-Radio Frequency Identification) to non-contacting recognition system.Therefore, RFID is that a kind of radiowave that utilizes is read and write programmed recording medium, radio-frequency technique is combined with the IC-card technology and can be used for the technology of remote, moving-target, wireless identification.

Rfid system is in concrete application process, and according to different application purposes and applied environment, the composition of system can be different, but with regard to its principle of work, system generally all is made up of transponder, reader and PC.Transponder should be placed on the object that will discern, can send and receive information, and can do processing such as read/write according to the operational order of receiving; Reader is to gather transponder information and transponder is sent the device of operational order, and the order of sending comprises read/write, selects order such as cancellation selections grade.

Antenna is a critical component in radio communication and the radar system as the equipment of a kind of reception and launching electromagnetic wave, and it is the interface of free space and transmission line, is commonly referred to " electronic eyes " or " electronic ear ".The effect of antenna in various radiotelegraphy equipment is identical basically.Any radiotelegraphy equipment all transmits signal by electromagnetic wave, and it must have the energy radiation or receive electromagnetic device, and antenna is exactly this device, so the effect of antenna at first is exactly radiation and receives electromagnetic wave.Based on such prerequisite, since the generation of wireless communication technique, antenna just has been born thereupon.

The antenna of electronic tag generally is divided into two kinds on the near field pattern that is operated in reader antenna and far field model.The near field pattern is to come work by the magnetic field of reader antenna, and the far field pattern is to lean on the electric field of reader antenna to come work.Nowadays the electronic tag majority of depositing ultrahigh frequency is the far field pattern that is operated in antenna, makes its communication distance can be far.And high and low frequency often adopts near-field working mode.The label antenna of near-field working mode generally is a wire coil, and coupling produces voltage between itself and the reader antenna, and the energy of work is provided for label chip.The antenna of the REID of magnetic field coupling is a wire coil, and under identical magnetic field, the number of turns is many more, and is just big more by the magnetic flux of antenna, and the electromotive force that antenna is inducted is also just big more.All often adopt the antenna of multi-turn in the REID of low frequency and high frequency, the two-port of coil and the two-port of chip weld together for this reason, mean that coil needs wire jumper (gap bridge) to make two ports of coil in same plane.Mean like this and increase the step that antenna is made, and then increase the cost of label.

Two ports of the coil of electronic tag need to link to each other with two ports of chip, and the size of chip is very little, is generally less than the radius of a millimeter.Therefore the antenna of conventional coil shape electronic tag all needs the means of passing a bridge, and for example illustrates 1.Among Fig. 1 10 is metals of coil; Two ports of coil and the coupling part 11 of chip are by laying insulating medium 12 between gap bridge metal 13 and coil metal 10, control 14 and connect by crossing between the double layer of metal; Coil at the 15 place's coil metals of the breach under the chip on same layer; Chip 16 has just constituted an integral body by the pad above it 17 such antenna that links to each other with aerial coil.Such structure or similar bridge structure all need extra making step and material, and therefore eiloid antenna packaging cost is higher than the label of ultrahigh frequency.And the popularization of electronic tag and its cost are closely bound up, and the present invention is exactly the method that reduces the coil antenna packaging cost.

Summary of the invention

The invention belongs to antenna technical field, cheaply the antenna design method of metal in same plane.The present invention adopts individual pen or by bonding pads being designed at the chip diagonal line or being distributed in the method on the long limit of chip, increases the spacing of pad, and the method for cabling realizes the design of isoplanar multi-turn antenna between two pads.Coil in the middle of pad can reduce its width, so that realize the low-cost antenna in the isoplanar of multi-turn.Have a mind to be designed to rectangular in the time of the wiring of chip, make that the distance between the chip bonding pad strengthens.

Doing does not so even need to adopt charge pump construction to be pressed (can lower efficiency like this) still conventional circuit design just can realize bigger induced potential.Because antenna once is being made into type together, its packaging cost can reduce greatly.

Description of drawings

The coil antenna synoptic diagram that the needs of Fig. 1 routine are passed a bridge and connected;

The produce once coil antenna design diagram of moulding of Fig. 2;

Number in the figure: the 10th, the metal of coil; The 11st, two ports of coil and the coupling part of chip; The 12nd, the insulating medium between the double layer of metal; 13 bridging metals; The 14th, the through hole between the double layer of metal; The 15th, the breach of coil under chip; The 16th, chip; The 17th, bonding pads; The 20th, the metal of coil; The 21st, two ports of coil and the coupling part of chip; The 22nd, label chip; The 23rd, chip bonding pad.

Embodiment

Further specifically describe this present invention's antenna design method below in conjunction with the accompanying drawing example.

Fig. 2 is the coil antenna design diagram of moulding of producing once.The present invention is designed at the chip diagonal line by the pad 23 with chip 22 or is distributed in the method on the long limit of chip, increases the spacing of pad, and the method for cabling 20 realizes the moulding of producing once of multi-turn antenna between two pads.Coil 21 in the middle of pad can reduce its width, so that realize the low-cost antenna in the isoplanar of multi-turn.Can have a mind to be designed to rectangular in the time of the wiring of chip 22, make that the distance between the chip bonding pad strengthens.

It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (4)

1. Design the working method of magnetic field coupling cheaply electronic label antenna method for designing, its feature shows as:

   1) the antenna metal is in the electronic label antenna design of the magnetic field of the moulding of producing once coupling working method;
2. 2) implementation method claim 1) is by bonding pads being designed at the chip diagonal line or being distributed in the method on the long limit of chip, increase the spacing of pad, and the method for cabling realizes the design of isoplanar multi-turn antenna between two pads;
3. 3) coil in the middle of pad can reduce its width, and at the normal day line width of other parts;
4. 4) also can be by increasing the resonant capacitance of chip, the method for individual pen antenna realizes antenna metal one-time making moulding.

Images