CN104051847A

CN104051847A - Radio frequency identification antenna

Info

Publication number: CN104051847A
Application number: CN201410304858.7A
Authority: CN
Inventors: 林仲珉
Original assignee: Nantong Fujitsu Microelectronics Co Ltd
Current assignee: Tongfu Microelectronics Co Ltd
Priority date: 2014-06-27
Filing date: 2014-06-27
Publication date: 2014-09-17
Anticipated expiration: 2034-06-27
Also published as: CN104051847B

Abstract

A radio frequency identification antenna comprises an underlying metal layer, a plurality of first metal layers, a plurality of second metal layers, insulating layers and metal connecting layers located in the insulating layers on the second portion, wherein the underlying metal layer comprises a first portion and a second portion, the first metal layers and the second metal layers are located on the first portion and stacked alternately in sequence, each first metal layer comprises a first end and a second end opposite to the first end, each second metal layer comprises a first end and a second end opposite to the first end, the second end of the first metal layer on the first layer is electrically connected with the first portion of the underlying metal layer, the first end of the second metal layer on the Nth layer is electrically connected with the first end of the first metal layer on the Nth layer, the second end of the first metal layer on the (N+1)th layer is electrically connected with the second end of the second metal layer on the Nth layer, the first end of the second metal layer on the (N+1)th layer is electrically connected with the first end of the first metal layer on the (N+1)th layer, the underlying metal layer, the first metal layers and the second metal layers are isolated through the insulating layers, and the metal connecting layers are electrically connected with the second portion of the underlying metal layer. The radio frequency identification antenna is small in size.

Description

RFID antenna

Technical field

The present invention relates to a kind of communication antenna, relate in particular to a kind of RFID antenna.

Background technology

RFID (radio-frequency (RF) identification: Radio Frequency Identification) be a kind of contactless automatic identification technology, it is automatically identified destination object and is obtained related data by radiofrequency signal, identification work need not manual intervention, wireless version as bar code, RFID technology has the not available waterproof of bar code, high temperature resistant, long service life, read that distance is large, on label data can encrypt, store that data capacity is larger, the storage information change advantage such as freely, its application will bring revolutionary variation to industries such as retail, logistics.

Basic rfid system is by reader (Reader) and electronic tag (or transponder, Transponder) two parts form, electronic tag (Tag) wherein: formed by RFID antenna and radio frequency integrated chip, each electronic tag has unique electronic code or preserves the electronic data of agreement form, is attached to and on object, identifies destination object; Reader (Reader): read the equipment of (sometimes can also write) label information, can be designed to hand-hold type or fixed.

Its operation principle of rfid system is: by reader, launch a set specific frequency signal to electronic tag, in order to drive the internal circuit in electronic tag, inner data are sent to (Passive Tag, passive label or passive label), or electronic tag initiatively sends out inner data (Active Tag, active label or active tag), now reader just sequentially receives the data that electronic tag sends, thereby reaches the object of automatic identification destination object.

In prior art, RFID antenna is generally by printing, etching, coiling or directly wire is imbedded to the modes such as carrying tablet and made, and formation electronic tag is then packaged together the RFID antenna of making and radio frequency integrated chip.Wherein, by the mode of etching or printing, make RFID antenna, often need the buying that originally dropped into relevant device of the higher one-tenth of cost, and the RFID antenna the forming structure that is plane, larger space occupied; And in the mode of coiling, metal wire or wire coiling are formed to RFID antenna, RFID antenna can occupy larger space equally, and because RFID antenna size is compared with the too little cause of radio frequency integrated chip size that needs greatly connection, and easily produce contraposition inaccuracy and the problem such as production yields is not good.

Summary of the invention

The problem that the present invention solves is how to reduce the volume that RFID antenna occupies.

For addressing the above problem, the invention provides a kind of RFID antenna, comprising: bottom metal layer, described bottom metal layer comprises the second portion that He Yu first of first is connected, be positioned at some stacking the first metal layer and the second metal levels of replacing successively in the first of bottom metal layer, the first metal layer includes first end and second end relative with first end with the second metal level, the second end of ground floor the first metal layer is electrically connected to the first of bottom metal layer, the first end of the second metal level of N (N >=1) layer is electrically connected to the first end of the first metal layer of N layer, the second end of the first metal layer of N+1 layer is electrically connected to second metal level the second end of N layer, the first end of the second metal level of N+1 layer is electrically connected to the first end of the first metal layer of N+1 layer, insulating barrier, described insulating barrier is by bottom metal layer, the first metal layer and the isolation of the second metal level, be arranged in the metal connecting layer of the insulating barrier on the second portion of bottom metal layer, the bottom of described metal connecting layer is electrically connected to the second portion of bottom metal layer, the top of described metal connecting layer is as external second port of RFID antenna, and the first metal layer of top layer or the second metal level are as external first port of RFID antenna.

Optionally, the material of described insulating barrier is photosensitive polyimides glue, epoxide-resin glue, benzocyclobutene glue or polybenzoxazoles glue.

Optionally, the material of described bottom metal layer, the first metal layer, the second metal level, metal connecting layer is one or more in Al, Cu, Ag, Au, Pt, W.

Optionally, the thickness of every one deck the first metal layer and the second metal level is 100 dust～5 millimeter, and the distance of adjacent the first metal layer and the second metal level is 200 dust～5 millimeter.

Optionally, also comprise: radio frequency integrated chip, described radio frequency integrated chip comprises first interface and the second interface, external first port of RFID antenna is electrically connected to the first interface of radio frequency integrated chip by the first metal wire, and external second port of RFID antenna is electrically connected to radio frequency integrated chip the second interface by the second metal wire.

The present invention also provides a kind of RFID antenna, comprising: bottom metal layer, and described bottom metal layer comprises first, second portion and the third part being connected, first and second portion are about third part plane symmetry, be positioned at some stacking the first metal layer and the second metal levels of replacing successively in the first of bottom metal layer, the first metal layer includes first end and second end relative with first end with the second metal, the second end of ground floor the first metal layer is electrically connected to the first of bottom metal layer, the first end of the second metal level of N (N >=1) layer is electrically connected to the first end of the first metal layer of N layer, the second end of the first metal layer of N+1 layer is electrically connected to second metal level the second end of N layer, the first end of the second metal level of N+1 layer is electrically connected to the first end of the first metal layer of N+1 layer, be positioned at some the 3rd stacking metal level and the 4th metal levels of replacing successively on the second portion of bottom metal layer, the 3rd metal level includes first end and second end relative with first end with the 4th metal, the second end of ground floor the 3rd metal level is electrically connected to the second portion of bottom metal layer, the 4th first end of metal level of N (N >=1) layer and the first end of the 3rd metal level of N layer are electrically connected to, the second end of the 3rd metal level of N+1 layer is electrically connected to the 4th metal level the second end of N layer, the 4th first end of metal level of N+1 layer and the first end of the 3rd metal level of N+1 layer are electrically connected to, and the 3rd metal level of the first metal layer of same layer and same layer is about third part plane symmetry, the 4th metal level of the second metal level of same layer and same layer is about third part plane symmetry, the first metal layer of top layer or the second metal level are as external first port of RFID antenna, and the 3rd metal level of top layer or the 4th metal level are as external second port of RFID antenna, insulating barrier, described insulating barrier is by bottom metal layer, the first metal layer, the second metal level, the 3rd metal level and the 4th metal level electric isolation.

Optionally, the material of described bottom metal layer, the first metal layer, the second metal level, the 3rd metal level and the 4th metal level is one or more in Al, Cu, Ag, Au, Pt, W.

Optionally, the thickness of described the first metal layer, the second metal level, the 3rd metal level and the 4th metal level is 100 dust～5 millimeter, the distance of adjacent the first metal layer and the second metal level is 200 dust～5 millimeter, and the 3rd adjacent metal level and the distance of the 4th metal level are 200 dust～5 millimeter.

Compared with prior art, technical scheme of the present invention has the following advantages:

RFID antenna of the present invention comprises, cover the insulating barrier of bottom metal layer, in insulating barrier on first area, be formed with some the first metal layers that stack gradually and the second metal level, between the first metal layer and the second metal level, pass through insulator separation, each the first metal layer comprises first end and second end relative with first end with the second metal level, the second end of ground floor the first metal layer is electrically connected to the first of bottom metal layer, the first end of N (N >=1) layer the second metal level is electrically connected to the first end of N layer the first metal layer, the second end of N+1 layer the first metal layer is electrically connected to N layer second metal level the second end, the first end of N+1 layer the second metal level is electrically connected to the first end of N+1 layer the first metal layer, in insulating barrier on described second area, be formed with metal connecting layer, the bottom of described metal connecting layer is electrically connected to the second portion of bottom metal layer.The first metal layer of RFID antenna and the second metal level stack gradually distribution, reduced the space that the plane of RFID antenna occupies, the thickness of the first metal layer and the second metal level can be thinner, distance between the first metal layer of adjacent layer and the second metal level can be less, thereby make the small volume of RFID antenna.

RFID antenna of the present invention has symmetrical structure, and (the 3rd metal level of the first metal layer of same layer and same layer is about third part plane symmetry, the 4th metal level of the second metal level of same layer and same layer is about third part plane symmetry), be conducive to reduce outside noise jamming, when receiving and send radio frequency model, improved accuracy and the stability of the radiofrequency signal of transmission.

Accompanying drawing explanation

Fig. 1～Figure 16 is the structural representation of the forming process of one embodiment of the invention RFID antenna;

Figure 17～Figure 32 is the structural representation of the forming process of another embodiment of the present invention RFID antenna.

Embodiment

As background technology is sayed, the RFID antenna that prior art is made occupy larger space, be unfavorable for RFID antenna and radio frequency integrated chip integral packaging.

For this reason, the embodiment of the present invention forms RFID antenna by integration making technology, the first metal layer of RFID antenna and the second metal level are to stack gradually distribution, reduced the space that the plane of RFID antenna occupies, and the RFID antenna of the embodiment of the present invention is to make by integrated technique, the thickness of the first metal layer and the second metal level can be done thinlyyer, distance between the first metal layer of adjacent layer and the second metal level can be less, thereby make the small volume of the RFID antenna of formation.

For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.When the embodiment of the present invention is described in detail in detail, for ease of explanation, schematic diagram can be disobeyed general ratio and be done local amplification, and described schematic diagram is example, and it should not limit the scope of the invention at this.The three-dimensional space that should comprise in addition, length, width and the degree of depth in actual fabrication.

Fig. 1～Figure 16 is the structural representation that one embodiment of the invention sets the forming process of identification antenna.

Please refer to Fig. 1, support plate 100 is provided, described support plate 100 comprises the second area 12 that first area 11 is adjacent with first area 11.

Described support plate 100 is as the platform of subsequent technique, and described support plate 100 can be semiconductor base (such as silicon substrate, germanium substrate etc.), and described support plate 100 can also be substrate of glass or macromolecule resin substrate.

Some the first metal layers that stack gradually and second metal level of follow-up formation RFID antenna on the first area 11 of described support plate 100, the metal connecting layer of follow-up formation RFID antenna on the second area 12 of support plate 100.

First area 11 on support plate 100 and the quantity of second area 12 can be a plurality of (being more than or equal to 2), each first area 11 is adjacent with corresponding second area 12, in order to be partial to follow-up cutting, some first areas 11 and second area 12 are ranks and arrange on support plate 100.In order to facilitate follow-up description, in the present embodiment, only using a first area 11 on support plate 100 and a second area 12 as example.

Continuation is with reference to figure 1, on described support plate 100, form bottom metal layer 101, described bottom metal layer 101 comprises the second portion that first is connected with first, and first is positioned on the first area 11 of support plate 100, and second portion is positioned on the second area 12 of support plate 100.

Described bottom metal layer 101 is follow-up for the first metal layer of the bottom on first area 11 (or ground floor) is electrically connected to the first metal connecting layer of bottom on second area 12.

The material of described bottom metal layer 101 is the metal materials such as copper, aluminium or tungsten.

The forming process of bottom metal layer 101 is: by sputtering technology, on the surface of support plate 100, form conductive layer (not shown); On conductive layer, form mask layer, have the opening that exposes conductive layer surface in described mask layer, the position of described opening is corresponding with the position of the bottom metal layer forming on follow-up support plate 100; Adopt electroplating technology in opening, to fill metal, form bottom metal layer 101; Remove described mask layer; Conductive layer on the support plate 100 of etching removal bottom metal layer 101 both sides, the bottom metal layer 101 remaining partially conductive layers in bottom are as a part for bottom metal layer.

In other embodiments of the invention, described bottom metal layer can form by sputter and etching technics, and detailed process is: first by sputtering technology, on support plate, form layer of metal layer; On metal level, form patterned mask layer; Take described patterned mask layer as metal level described in mask etching, on support plate, form bottom metal layer.

Please refer to Fig. 2, form ground floor the first insulating barrier 102a that covers described bottom metal layer 101 and support plate 100, in described ground floor the first insulating barrier 102a, there is first opening 104 on the first surface of the bottom metal layer 101 exposing on first area 11, and the second opening 103 that exposes the second portion surface of the bottom metal layer 101 on second area 12.

In the present embodiment, when making RFID antenna, some layers be can form and the first stacking insulating barrier and the second insulating barrier replaced, described ground floor the first insulating barrier 102a refers to the first insulating barrier that is positioned at the bottom or ground floor, and the material of described ground floor the first insulating barrier 102a is photosensitive polyimides glue, epoxide-resin glue, benzocyclobutene glue or polybenzoxazoles glue etc.Described ground floor the first insulating barrier 102a adopts photosensitive macromolecular material, described ground floor the first insulating barrier 102a not only can be used as isolated material, and can in ground floor the first insulating barrier 102a, form very easily the first opening 104 and the second opening 103 by exposure and developing process, reduce the complexity of technique.

In one embodiment, adopt dry film or wet film technique to form ground floor the first insulating barrier 102a, by exposure and developing process, in ground floor the first insulating barrier 102a, form the first opening 104 and the second opening 103.

In another embodiment, adopt screen printing technique to form described ground floor the first insulating barrier 102a, in ground floor the first insulating barrier 102a, form the first opening 104 and the second opening 103 simultaneously.

In other embodiments of the invention, the material of described ground floor the first insulating barrier can also be the isolated materials such as silica, silicon nitride, adopt chemical vapor deposition method to form described ground floor the first insulating barrier, by photoetching and etching technics, in ground floor the first insulating barrier, form the first opening and the second opening.

In the embodiment of the present invention, adopt integrated technique to make RFID antenna, described ground floor the first insulating barrier 102a can do thinlyyer, reduces the volume that the RFID antenna of follow-up formation occupies.The thickness of described ground floor the first insulating barrier 102a can be 200 dust～5 millimeter, concrete, in one embodiment, the thickness of ground floor the first insulating barrier 102a can be 20 nanometer～3 millimeter, in another embodiment, the thickness of ground floor the first insulating barrier 102a can be 0.2 micron～0.5 millimeter.

Please refer to Fig. 3, form the first opening 104 and the second opening 103 in ground floor the first insulating barrier 102a after, at the first opening 104 and the second opening 103 sidewalls and lower surface and ground floor first insulating barrier 102a surface formation ground floor the first conductive layer 105.

Conductive layer when described ground floor the first conductive layer 105 forms ground floor the first metal layer and ground floor the first metal connecting layer as following adopted electroplating technology.

The material of described ground floor the first conductive layer 105 is one or more in Ni, Ti, TiN, TaN, Ta, TaC.Adopt sputtering technology to form described ground floor the first conductive layer 105.

Described ground floor the first conductive layer 105 can also, as diffusion impervious layer, prevent that the ground floor the first metal layer of follow-up formation and the metallic atom in ground floor the first metal connecting layer from spreading in ground floor the first insulating barrier 102a.

Described ground floor the first conductive layer 105 can be single or multiple lift (being greater than 1 layer) stacked structure.When described ground floor the first conductive layer 105 is multiple-level stack structure, in a specific embodiment, described ground floor the first conductive layer 105 can be Ti and TiN double stacked structure, or the double stacked structure of Ta and TaN.

In one embodiment of the invention, after forming ground floor the first conductive layer 105, can also on described ground floor the first conductive layer 105 surfaces, form one deck inculating crystal layer by sputtering technology.

Please refer to Fig. 4, on ground floor the first conductive layer 105, form ground floor the first photoresist layer 106, in described ground floor the first photoresist layer 106, there is the 5th opening 107 and the 6th opening 108, described the 5th opening 107 exposes ground floor first conductive layer 105 of the part ground floor first insulating barrier 102a top of the first opening 104 and first area 11, and described the 6th opening 108 exposes ground floor the first conductive layer 105 in the second opening 103.

By exposure and developing process, in described ground floor the first photoresist layer 106, form the 5th opening 107 and the 6th opening 108.

Please refer to Fig. 5, adopt electroplating technology, in the 5th opening 107 and the first opening 104 (with reference to figure 4), form ground floor the first metal layer 109a, one end that the first with bottom metal layer 101 of described ground floor the first metal layer 109a is electrically connected to is the second end, one end not being electrically connected to bottom metal layer 101 of ground floor the first metal layer 109a is first end, in the 6th opening 108 and the second opening 103 (with reference to figure 4), form ground floor the first metal connecting layer 110a, ground floor the first metal connecting layer 110a is electrically connected to the second portion of bottom metal layer 101.

In the present embodiment, when making RFID antenna, on the first area 11 of support plate 100, can form the first metal layer and the second metal level that some layers stack gradually, described ground floor the first metal layer 109a refers to the first metal layer that is positioned at the bottom or ground floor in some layer (being greater than 1 layer) the first metal layers, on the second area of support plate 100, can form some layers the first metal connecting layer and the second metal connecting layer, described ground floor the first metal connecting layer 110a refers to the first metal connecting layer that is positioned at the bottom or ground floor in some layer (being greater than 1 layer) first metal connecting layer.

The material of described ground floor the first metal layer 109a and ground floor the first metal connecting layer 110a is one or more in Al, Cu, Ag, Au, Pt, W.In the present embodiment, the material of described ground floor the first metal layer 109a and ground floor the first metal connecting layer 110a is Cu.

In the present embodiment, by electroplating technology, form described ground floor the first metal layer 109a and ground floor the first metal connecting layer 110a, in other embodiments of the invention, forming ground floor the first insulating barrier that covers described bottom metal layer and support plate, first opening in described ground floor the first insulating barrier with the first surface of the bottom metal layer exposing on first area, and expose after second opening on second portion surface of the bottom metal layer on second area, on ground floor surface of insulating layer and in the first opening and the second opening, form metal level, metal level can form by sputter and metal film process for pressing, then on metal level, form patterned mask, the described patterned mask of take is mask, and etching is removed the described metal level of part, on the first opening and part ground floor insulating barrier, forms ground floor the first metal layer, forms ground floor the first metal connecting layer in the second opening.

The thickness of ground floor the first metal layer 109a is 100 dust～5 millimeter, concrete, in one embodiment, the thickness of ground floor the first metal layer 109a can be 10 nanometer～3 millimeter, in another embodiment, the thickness of ground floor the first metal layer 109a can be 0.2 micron～0.5 millimeter.

Please refer to Fig. 6, remove described ground floor the first photoresist layer 106 (with reference to figure 5); Etching is removed ground floor first conductive layer 105 of ground floor the first metal layer 109a and ground floor the first metal connecting layer 110a both sides.

Adopt cineration technics to remove described ground floor the first photoresist layer 106.When carrying out cineration technics, the ground floor first insulating barrier 102a of described ground floor first 105 pairs of bottoms of conductive layer protects.

After removing ground floor the first photoresist layer 106, take described ground floor the first metal layer 109a and ground floor the first metal connecting layer 110a is mask, and etching is removed ground floor first conductive layer 105 of ground floor the first metal layer 109a and ground floor the first metal connecting layer 110a both sides.

Remaining part ground floor the first conductive layer 105 in described ground floor the first metal layer 109a bottom can be used as a part of ground floor the first metal layer 109a, and in ground floor the first metal connecting layer 110a bottom and partial sidewall, remaining ground floor the first conductive layer 105 is as a part of ground floor the first metal connecting layer 110a.

Please refer to Fig. 7, form ground floor the second insulating barrier 103a that covers described ground floor the first metal layer 109a, ground floor the first metal connecting layer 110a and ground floor the first insulating barrier 102a, in described ground floor the second insulating barrier 103a, there is the 3rd opening 111 on the first end surface that exposes ground floor the first metal layer 109a, and the 4th opening 112 that exposes ground floor the first metal connecting layer 110a.

In the present embodiment, when making RFID antenna, can form some layers and replace the first stacking insulating barrier and the second insulating barrier, described ground floor the second insulating barrier 103a refers to the second insulating barrier that is positioned at the second insulating barrier of ground floor in some layer (being greater than 1 layer) second insulating barriers or is positioned at the lip-deep one deck of ground floor the first insulating barrier 102a.The material of described ground floor the second insulating barrier 103a is photosensitive polyimides glue, epoxide-resin glue, benzocyclobutene glue or polybenzoxazoles glue etc.Described ground floor the second insulating barrier 103a adopts photosensitive macromolecular material, described ground floor the second insulating barrier 103a not only can be used as isolated material, and can in ground floor the second insulating barrier 103a, form very easily the 3rd opening 111 and the 4th opening 112 by exposure and developing process, reduce the complexity of technique.

In one embodiment, adopt dry film or wet film technique to form described ground floor the second insulating barrier 103a, by exposure and developing process, in ground floor the second insulating barrier 103a, form the 3rd opening 111 and the 4th opening 112.

In another embodiment, adopt screen printing technique to form described ground floor the second insulating barrier 103a, in ground floor the second insulating barrier 103a, form the 3rd opening 111 and the 4th opening 112 simultaneously.

In other embodiments of the invention, the material of described ground floor the second insulating barrier can also be the isolated materials such as silica, silicon nitride, adopt chemical vapor deposition method to form described ground floor the second insulating barrier, by photoetching and etching technics, in ground floor the second insulating barrier, form the first opening and the second opening.

The material of described ground floor the second insulating barrier 103a is also identical with the material same thickness of ground floor the first insulating barrier 102a, so that ground floor the first insulating barrier 102a and ground floor the second insulating barrier 103a insulation characterisitic are consistent, and make to there is good adhesiveness and interfacial characteristics between ground floor the first insulating barrier 102a and ground floor the second insulating barrier 103a, prevent when being heated or during extruding, ground floor the second insulating barrier 103a comes off or peels off from ground floor the first insulating barrier 102a surface.In the present embodiment, the material of described ground floor the second insulating barrier 103a is photosensitive polyimides glue.

Please refer to Fig. 8, in ground floor the second insulating barrier 103a, form after the 3rd opening 111 and the 4th opening 112, on the sidewall of described the 3rd opening 111 and the 4th opening 112 and the surface of bottom and ground floor the second insulating barrier 103a, form ground floor the second conductive layer 113.

Conductive layer when described ground floor the second conductive layer 113 forms ground floor the second metal level and ground floor the second metal connecting layer as following adopted electroplating technology.

The material of described ground floor the second conductive layer 113 is one or more in Ni, Ti, TiN, TaN, Ta, TaC.Described ground floor the second conductive layer 113 is identical with the material of ground floor the first conductive layer, adopts sputtering technology to form described ground floor the second conductive layer 113.

Described ground floor the second conductive layer 113 can also be as diffusion impervious layer, prevents that the second metal level of follow-up formation and the metallic atom in the second metal connecting layer are to spreading in ground floor the second insulating barrier 103a.

Described ground floor the second conductive layer 113 can be single or multiple lift (being greater than 1 layer) stacked structure.When described ground floor the second conductive layer 113 is multiple-level stack structure, in a specific embodiment, described ground floor the second conductive layer 113 can be Ti and TiN double stacked structure, or the double stacked structure of Ta and TaN.

In one embodiment of the invention, after forming ground floor the second conductive layer 113, can also on described ground floor the second conductive layer 113 surfaces, form one deck inculating crystal layer by sputtering technology.

With reference to figure 9, on ground floor the second conductive layer 113, form ground floor the second photoresist layer 114, in described ground floor the second photoresist layer 114, there is minion mouth 116 and octavo mouth 115, described minion mouth 116 exposes ground floor the second conductive layer 113 on the 3rd opening 111 and ground floor the first metal layer 109a, and described octavo mouth 115 exposes ground floor the second conductive layer 113 in the 4th opening 112.

By wet film or dry film technique, form described ground floor the second photoresist layer 114, ground floor the second photoresist layer 114 is exposed and developed, in ground floor the second photoresist layer 114, form minion mouth 116 and octavo mouth 115.

The width of described minion mouth 116 can be greater than, equals or be less than the width of ground floor the first metal layer 109a, makes ground floor second metal level of follow-up formation be greater than, equal or be less than the width of ground floor the first metal layer 109a.It should be noted that, the width of minion mouth 116 is that the sidewall surfaces of the close second area 12 of minion mouth 116 arrives the vertical range away from the sidewall surfaces of second area 12, and the width of ground floor the first metal layer 109a is the first end of ground floor the first metal layer 109a and the vertical range between the second end.

The width of described octavo mouth 115 equals the width of ground floor the first metal connecting layer 110a.

Please refer to Figure 10, adopt electroplating technology, in described minion mouth 116 (with reference to figure 9) and the 3rd opening 111 (with reference to figure 9), form ground floor the second metal level 117a, one end being electrically connected to ground floor the first metal layer 109a of ground floor the second metal level 117a is first end, one end not being electrically connected to ground floor the first metal layer 109a of ground floor the second metal level 117a is the second end, forms ground floor the second metal connecting layer 118a in octavo mouth 115 (with reference to figure 9) and the 4th opening 112 (with reference to figure 9).

In the present embodiment, when making RFID antenna, on the first area 11 of support plate 100, can form the first metal layer and the second metal level that some layers stack gradually, described ground floor the second metal level 117a refers in some layer (being greater than 1 layer) second metal levels and is positioned at the second metal level of ground floor or refers to be positioned at lip-deep one deck the second metal level of ground floor the second insulating barrier 103a.

On the second area 12 of support plate 100, can form some layers the first metal connecting layer and the second metal connecting layer, described ground floor the second metal connecting layer 118a refers in some layer (being greater than 1 layer) second metal connecting layer and is positioned at the second metal connecting layer of ground floor, or refers to be positioned at lip-deep one deck the second metal connecting layer of ground floor the second metal connecting layer 11a.

The material of described ground floor the second metal level 117a and ground floor the second metal connecting layer 118a is one or more in Al, Cu, Ag, Au, Pt, W.In order to keep the stability of RFID antenna electric property, described ground floor the second metal level 117a and ground floor the second metal connecting layer 118a are also identical with the material same thickness of described ground floor the first metal layer 109a and ground floor the first metal connecting layer 110a, in the present embodiment, the material of described ground floor the second metal level 117a and ground floor the second metal connecting layer 118a is Cu.

In the present embodiment, the first end of ground floor the second metal level 117a is electrically connected to the first end of ground floor the first metal layer 109a.

Please refer to Figure 11, remove described ground floor the second photoresist layer 114 (with reference to Figure 10); Etching is removed ground floor second conductive layer 113 of ground floor the second metal level 117a and ground floor the second metal connecting layer 118a both sides.

Adopt cineration technics to remove described ground floor the second photoresist layer 114.When carrying out cineration technics, the ground floor second insulating barrier 103a of described ground floor second 103 pairs of bottoms of conductive layer protects.

After removing ground floor the second photoresist layer 114, take described ground floor the second metal level 117a and ground floor the second metal connecting layer 118a is mask, and etching is removed ground floor first conductive layer 105 of ground floor the second metal level 117a and ground floor the second metal connecting layer 118a both sides.

Described ground floor the second remaining part ground floor the second conductive layer 113 in metal level 117a bottom can be used as a part of ground floor the second metal level 117a, and in ground floor the second metal connecting layer 118a bottom and partial sidewall, remaining ground floor the second conductive layer 113 is as a part of ground floor the second metal connecting layer 118a.

Please refer to Figure 12, form the second layer the first insulating barrier 102b that covers described ground floor the second metal level 117a and ground floor the second insulating barrier 103a surface, in the described second layer the first insulating barrier 102b, there is the first opening of the second end surfaces that exposes ground floor the second metal level 117a, and the second opening that exposes ground floor the second metal connecting layer surface 118a; On described the first opening and the part second layer the first insulating barrier 102b surface, form second layer the first metal layer 109b, described second layer the first metal layer 109b is positioned at ground floor the second metal level 117a top, one end being electrically connected to ground floor the second metal level 117a of described second layer the first metal layer 109b is the second end, one end not being electrically connected to ground floor the second metal level 117a of second layer the first metal layer 109b is first end, forms the second layer the first metal connecting layer 110b in described the second opening.

Then, form the second layer the second insulating barrier 103b that covers described second layer the first metal layer 109b, the second layer the first metal connecting layer 110b and the second layer the first insulating barrier 102b, in the described second layer the second insulating barrier 103b, there is the 3rd opening on the first end surface that exposes second layer the first metal layer 109b, and the 4th opening that exposes the second layer the first metal connecting layer 110b; On described the 3rd opening and the part second layer the second insulating barrier 103b surface, form the second layer the second metal level 117b, the described second layer the second metal level 117b is positioned at second layer the first metal layer 109b top, one end being electrically connected to second layer the first metal layer 109b of the second layer the second metal level 117b is first end, one end not being electrically connected to second layer the first metal layer 109b of the second layer the second metal level 117b is the second end, forms the second layer the second metal connecting layer 118b in the 4th opening.

In the present embodiment, on the first area 11 of support plate 100, form two-layer the first metal layer and two-layer the second metal level, the first metal layer and the second metal level stack gradually, on the second area 12 of support plate, form two-layer the first metal connecting layer and two-layer the second metal connecting layer, the first metal connecting layer and the second metal connecting layer stack gradually.

In other embodiments of the invention, the number of plies of described stacking the first metal layer and the second metal level can be greater than two-layer, and the formation technique of the first metal layer of every one deck is identical, and the formation technique of second metal level of corresponding every one deck is also identical.

Concrete, the forming process of described N (N >=2) layer the first metal layer and N (N >=2) layer the first metal connecting layer is: form N layer the first insulating barrier that covers described N-1 layer the second metal level and N-1 layer the second surface of insulating layer, in described N layer the first insulating barrier, there is the first opening of the second end surfaces that exposes N-1 layer the second metal level, and the second opening that exposes N-1 layer the second metal connecting layer surface; In the first opening and the second opening sidewalls and lower surface and N-1 layer the second surface of insulating layer, form N layer the first conductive layer; On N layer the first conductive layer, form N layer the first photoresist layer, in described N layer the first photoresist layer, there is the 5th opening and the 6th opening, described the 5th opening exposes N layer first conductive layer of the first opening and N-1 layer the second metal level top, and described the 6th opening exposes N layer the first conductive layer in the second opening; Adopt electroplating technology, in the 5th opening and the first opening, form N layer the first metal layer, one end being electrically connected to N-1 layer the second metal level of described N layer the first metal layer is the second end, one end not being electrically connected to N layer the second metal level of N layer the first metal layer is first end, in the 6th opening and the second opening, forms N layer the first metal connecting layer; Remove described N layer the first photoresist layer; Etching is removed N layer first conductive layer of N layer the first metal layer and N layer the first metal connecting layer both sides.

After forming N (N >=2) layer the first metal layer and N (N >=2) layer the first metal connecting layer, form N (N >=2) layer the second metal level and N (N >=2) layer the second metal connecting layer, the forming process of described N (N >=2) layer the second metal level and N (N >=2) layer the second metal connecting layer is: form and cover described N layer the first metal layer, N layer second insulating barrier of N layer the first metal connecting layer and N layer the first insulating barrier, the 3rd opening in described N layer the second insulating barrier with the first end surface that exposes N layer the first metal layer, and the 4th opening that exposes N layer the first metal connecting layer, on the sidewall of described the 3rd opening and the 4th opening and the surface of bottom and N layer the second insulating barrier, form N layer the second conductive layer, on N layer the second conductive layer, form N layer the second photoresist layer, in described N layer the second photoresist layer, there is minion mouth and octavo mouth, described minion mouth exposes N layer the second conductive layer on the 3rd opening and N layer the first metal layer, and described octavo mouth exposes N layer the second conductive layer in the 4th opening, adopt electroplating technology, in described minion mouth and the 3rd opening, form N layer the second metal level, one end being electrically connected to N layer the first metal layer of N layer the second metal level is first end, one end not being electrically connected to N layer the first metal layer of N layer the second metal level is the second end, in octavo mouth and the 4th opening, forms N layer the second metal connecting layer, remove described N layer the second photoresist layer, etching is removed N layer second conductive layer of N layer the second metal level and N layer the second metal connecting layer both sides.

The first metal connecting layer and the second metal connecting layer that some layers stack gradually form metal connecting layer, and the first insulating barrier and the second insulating barrier that some layers stack gradually form insulating barrier.

When the first metal layer stacking gradually in formation some (being more than or equal to two-layer) and the second metal level, the metal level that is positioned at top layer can be the first metal layer or the second metal level, and the articulamentum that is positioned at accordingly top layer can the first metal connecting layer or the second metal connecting layer.

Also comprise: on the first metal layer of top layer or the second layer on surface of metal, form the first pad, the first pad is as external first port of RFID antenna; On the first metal connecting layer of top layer or the second metal connecting layer surface, form the second pad, the second pad is as the second external-connected port of RFID antenna; The first metal connecting layer or the second metal connecting layer, the first insulating barrier of top layer or the top insulating layer of the second insulating barrier of the first metal layer of described the first pad of formation covering, the second pad, top layer or the second metal level, top layer, described top insulating layer exposes the top surface of the first pad and the second pad, and described top insulating layer is as a part for insulating barrier.

In other embodiments of the invention, also can be directly external the first port using the first metal layer of top layer or the second metal level as RFID antenna, external the second port using the first metal connecting layer of top layer or the second metal connecting layer as RFID antenna, the first external-connected port and the second external-connected port are follow-up to be electrically connected to radio frequency integrated chip.

In the present embodiment, the metal level that is positioned at top layer is the second metal level (second layer the second metal level 117b), the articulamentum that is positioned at top layer is the second metal connecting layer (second layer metal articulamentum 118b), on the second layer the second metal level 117b surface, form the first pad 119, the first pad 119 is as external the first port, on the surface of second layer metal articulamentum 118b, form the second pad 120, the second pads 120 as external the second port; Form the top insulating layer 121 that covers the described second layer the second metal level 117b, second layer metal articulamentum 118b, the first pad 119, the second pad 120, the second layer the second insulating barrier 103b.

With reference to Figure 13, remove described support plate 100 (with reference to Figure 12), Figure 13 is that Figure 12 removes the perspective view (the first conductive layer and the second conductive layer are not shown) after support plate 100, bottom metal layer 101 comprises first 21 and the second portion 22 being connected, first 21 is positioned on the surface, first area 11 (with reference to Figure 12) of support plate 100, and second portion 22 is positioned on second area 12 (with reference to Figure 12) surface of support plate 100.

Described support plate 100 is removed by stripping technology.After support plate 100 is removed, the thickness attenuation of the RFID antenna of follow-up formation.

In other embodiments of the invention, described support plate 100 can not removed yet, follow-up support plate 100, the formation RFID antenna of simultaneously cutting when cutting.

In conjunction with reference to Figure 13 and Figure 14, edge is across the first 21 of bottom metal layer 101 and the direction of second portion 22 (or along line of cut AB direction), cut described the second metal level (ground floor the second metal level 117a and the second layer the second metal level 117a), the first metal layer (ground floor the first metal layer 109a and second layer the first metal layer 109b), bottom metal layer 101, metal connecting layer (ground floor the first metal connecting layer 110a, ground floor the second metal connecting layer 118a, the second layer the first metal connecting layer 110a, the second layer the second metal connecting layer 118b) and insulating barrier (ground floor the first insulating barrier 102a, ground floor the second insulating barrier 103a, the second layer the first insulating barrier 102b, the second layer the second insulating barrier 103b, top insulating layer 121), form some discrete RFID antenna 14, external first port as RFID antenna 14 of the first metal layer of top layer or the second metal level, the top of metal connecting layer is as external second port of RFID antenna 14.

Described cutting can be blade cuts or laser cutting, by cutting, forms some discrete RFID antenna 14.

When cutting, can also cut the first pad 119 and second pad 120 at top simultaneously.

In the present embodiment, when forming ground floor the first metal layer 109a, the first end of ground floor the first metal layer 109a is electrically connected to the first 21 of bottom metal layer 101, and the second end of ground floor the first metal layer 109a is positioned at the second portion 22 of the upper and close bottom metal layer 101 of ground floor the first insulating barrier 102a.In other embodiments of the invention, please refer to Figure 15, when forming ground floor the first metal layer 109a, the first end of ground floor the first metal layer 109a is electrically connected to the first 21 of bottom metal layer 101, and it is upper and away from the second portion 22 of bottom metal layer 101 that the second end of ground floor the first metal layer 109a is positioned at ground floor the first insulating barrier 102a.

With reference to Figure 16, provide radio frequency integrated chip 122; Radio frequency integrated chip 122 is electrically connected to the first external-connected port and second external-connected port of RFID antenna 14.

Described radio frequency integrated chip 122 and RFID antenna 14 form the transponder (or electronic tag) of radio-frequency recognition system, described radio frequency integrated chip 122 is for storing the information relevant to destination object, the signal that RFID antenna 14 is received is processed, and the relevant information of storage can be sent by RFID antenna 14.Described RFID antenna 14 is for receiving the radiofrequency signal of outside (reader), and for outwards sending radiofrequency signal.

Described radio frequency integrated chip 122 also has identification verification function, and when the read signal of reader, described radio frequency integrated chip 122 can send authorization information the identity of reader is verified.

The transponder of the present embodiment (or electronic tag) can be the transponder (or electronic tag) of passive, active or half active form, described RFID antenna 14 can also produce induced current as coupled apparatus, to radio frequency integrated chip 122 and RFID antenna 14, provides driving-energy.

Described radio frequency integrated chip 122 comprises first interface 124 and the second interface 123, and first interface 124 and the second interface 123 are electrically connected to the internal circuit of radio frequency integrated chip 122.By lead key closing process, form the first metal wire 223 and the second metal wire 224, described the first metal wire 223 is electrically connected to external first port of RFID antenna 14 (or first pad 119) with the first interface 124 of radio frequency integrated chip 122, described the second metal wire 224 is electrically connected to external second port of RFID antenna 14 (or second pad 120) with radio frequency integrated chip 122 second interfaces 123.

Described lead key closing process can be thermocompression bonding, supersonic bonding or hot pressing supersonic bonding.Using and form the first metal wire 223 as example, concrete bonding process is: first the metal wire of chopper and the first interface 124 of radio frequency integrated chip 122 through bonder contacts formation the first solder joint; Then chopper lifts and moves to the first port direction of RFID antenna 14, forms metal camber line; Then chopper is downward, metal wire is contacted with the first port of RFID antenna 14 and form the second solder joint, and cut off metal wire simultaneously, forms the first metal wire 223.

In other embodiments of the invention, can also form plastic packaging layer by radio frequency integrated chip 122 and RFID antenna 14 plastic packagings.

The embodiment of the present invention also provides a kind of RFID antenna, please refer to Figure 16, comprising:

Bottom metal layer 101, described bottom metal layer 101 comprises the second portion 22 that 21He Yu first of first 21 is connected;

Be positioned at some stacking the first metal layer (comprising: ground floor the first metal layer 109a and second layer the first metal layer 109b) and the second metal levels (comprising: ground floor the second metal level 117a and the second layer the second metal level 117b) of replacing successively in the first 21 of bottom metal layer 101, the first metal layer includes first end and second end relative with first end with the second metal level, the second end of ground floor the first metal layer 109a is electrically connected to the first 21 of bottom metal layer 101, the first end of the second metal level of N (N >=1) layer is electrically connected to the first end of the first metal layer of N layer, the second end of the first metal layer of N+1 layer is electrically connected to second metal level the second end of N layer, the first end of the second metal level of N+1 layer is electrically connected to the first end of the first metal layer of N+1 layer,

Insulating barrier 125, described insulating barrier 125 is by bottom metal layer 101, the first metal layer (comprising: 109a and 109b) and the second metal level (comprising: 117a and 117b) isolation;

Be arranged in the metal connecting layer 126 of the insulating barrier 125 on the second portion 22 of bottom metal layer 101, the bottom of described metal connecting layer 126 is electrically connected to the second portion 22 of bottom metal layer 101, the top of described metal connecting layer 126 is as external second port one 20 of RFID antenna 14, and the first metal layer of top layer or the second metal level are as external first port 119 of RFID antenna.

In the present embodiment, using two-layer the first metal layer and two-layer the second metal level as example, two-layer the first metal layer comprises ground floor the first metal layer 109a and second layer the first metal layer 109b, two-layer the second metal level comprises: ground floor the second metal level 117a and the second layer the second metal level 117b, ground floor the first metal layer 109a comprises relative first end and the second end, ground floor the first metal layer 109a, ground floor the second metal level 117a, second layer the first metal layer 109b and the second layer the second metal level 117b stack gradually distribution on bottom metal layer 201, ground floor the first metal layer 109a, ground floor the second metal level 117a, second layer the first metal layer 109b includes with the second layer the second metal level 117b the second end that first end is relative with first end, and ground floor the first metal layer 109a, ground floor the second metal level 117a, between second layer the first metal layer 109b and the second layer the second metal level 117b, by insulating barrier 125, (comprise ground floor the first insulating barrier 102a, ground floor the second insulating barrier 103a, the second layer the first insulating barrier 102b, the second layer the second insulating barrier 103b) electric isolation, concrete: ground floor the first insulating barrier 102a covers described bottom metal layer 101, first opening in described ground floor the first insulating barrier 102a with first 21 surfaces that expose bottom metal layer 101, be positioned on ground floor the first insulating barrier 102a and the first opening ground floor the first metal layer 109a, the second end of ground floor the first metal layer 109a is electrically connected to the first of bottom metal layer 101, and one end not being electrically connected to bottom metal layer 101 of ground floor the first metal layer 109a is first end, cover ground floor the second insulating barrier 103a of described ground floor the first metal layer 109a, ground floor the first insulating barrier 102a, in described ground floor the second insulating barrier 103a, there is the 3rd opening on the first end surface that exposes ground floor the first metal layer 109a, be positioned at the lip-deep ground floor second metal level 117a of ground floor the second insulating barrier 103a of the 3rd opening and ground floor the first metal layer 109a top, the first end of ground floor the second metal level 117a is electrically connected to the first end of ground floor the first metal layer 109a, and one end not being electrically connected to ground floor the first metal layer 109a of ground floor the second metal level 117a is the second end, cover the second layer first insulating barrier 102b on described ground floor the second metal level 117a and ground floor the second insulating barrier 103a surface, in the described second layer the first insulating barrier 102b, there is the first opening of the second end surfaces that exposes ground floor the second metal level 117a, be positioned on the first opening of the second layer the first insulating barrier 102b and the second layer the first insulating barrier 102b part surface, described second layer the first metal layer 109b is positioned at ground floor the second metal level 117a top, described second layer the first metal layer 109b the second end is electrically connected to the second end of ground floor the second metal level 117a, and one end not being electrically connected to ground floor the second metal level 117a of second layer the first metal layer 109b is first end, form the second layer the second insulating barrier 103b that covers described second layer the first metal layer 109b and the second layer the first insulating barrier 102b, in the described second layer the second insulating barrier 103b, there is the 3rd opening on the first end surface that exposes second layer the first metal layer 109b, be positioned on the 3rd opening and the part second layer the second insulating barrier 103b surface of the second layer the second insulating barrier 103b, the described second layer the second metal level 117b is positioned at second layer the first metal layer 109b top, the first end of the second layer the second metal level 117b is electrically connected to the first end of second layer the first metal layer 109b, and one end not being electrically connected to second layer the first metal layer 109b of the second layer the second metal level 117b is the second end.

Described metal connecting layer 126 comprises ground floor the first metal connecting layer 110a, ground floor the second metal connecting layer 118a, the second layer the first metal connecting layer 110b, the second layer the second metal connecting layer 118b stacking gradually.

In other embodiments of the invention, the number of plies N of described the first metal layer, the second metal level, the first metal connecting layer and the second metal connecting layer is greater than two-layer.The number of plies N of corresponding the first insulating barrier and the second insulating barrier is also greater than two-layer.

The material of described insulating barrier 125 is photosensitive polyimides glue, epoxide-resin glue, benzocyclobutene glue or polybenzoxazoles glue.

The material of described bottom metal layer 101, the first metal layer, the second metal level, metal connecting layer is one or more in Al, Cu, Ag, Au, Pt, W.

The thickness of every one deck the first metal layer and the second metal level is 100 dust～5 millimeter, and the distance of adjacent the first metal layer and the second metal level is 200 dust～5 millimeter.

Also comprise: be positioned at the first pad 119, the first pads 119 of the second layer the second metal level 117b surface formation as external the first port, be positioned at the second surperficial pad 120, the second pads 120 of second layer metal articulamentum 118b as external the second port; The top insulating layer 121 that covers the described second layer the second metal level 117b, second layer metal articulamentum 118b, the first pad 119, the second pad 120, the second layer the second insulating barrier 103b, top insulating layer 121 is as a part for insulating barrier 125.

Also comprise: radio frequency integrated chip 122, described radio frequency integrated chip 122 comprises first interface 124 and the second interface 123, external first port of RFID antenna 14 (the first pad 119) is electrically connected to the first interface 124 of radio frequency integrated chip 122 by the first metal wire 223, and external second port of RFID antenna 14 (the second pad 120) is electrically connected to the second interface 123 of radio frequency integrated chip 122 by the second metal wire 224.

It should be noted that, associated description and the restriction of the forming process that please refer to aforementioned RFID antenna about other descriptions and the restriction of RFID antenna, do not repeat them here.

With reference to Figure 17, support plate 200 is provided, described support plate 200 comprises first area 11, second area 12 and the 3rd region 12 between first area 11 and second area 12, first area 11 and second area 12 are about the 3rd region 13 plane symmetry.

It should be noted that, plane symmetry specifically refers to: do the reference planes perpendicular to support plate 200 surfaces, and described reference planes divide the 3rd region 13 for symmetrical two parts equally, the first area 11 of support plate 200 and second area 12 are symmetrical about described reference planes.

With reference to Figure 18, on described support plate 200, form bottom metal layer 201, described bottom metal layer 201 comprises first, second portion and the third part of connection, on the second area 12 that first is positioned on the first area 11 of support plate 200, second portion is positioned at support plate 200, third part is positioned on the 3rd region 13 of support plate 200, first and second portion are about the 3rd region 13 plane symmetry; Form ground floor the first insulating barrier 202a that covers described bottom metal layer 201 and support plate 200, first opening 204 in described ground floor the first insulating barrier 202a with the first surface of the bottom metal layer 201 exposing on first area 11, and expose second opening 203, the first openings 204 on second portion 12 surfaces of the bottom metal layer 201 on second area 12 and the second opening 203 about the 3rd region 13 plane symmetry.

Ground floor the first insulating barrier 202a thickness can be 200 dust～5 millimeter, concrete, in one embodiment, the thickness of ground floor the first insulating barrier 102a can be 20 nanometer～3 millimeter, in another embodiment, the thickness of ground floor the first insulating barrier 102a can be 0.2 micron～0.5 millimeter.

With reference to Figure 19, at the first opening 204 and the second opening 203 sidewalls and lower surface and ground floor first insulating barrier 202a surface formation ground floor the first conductive layer 205.

With reference to Figure 20, on ground floor the first conductive layer 205, form ground floor the first photoresist layer 206, in described ground floor the first photoresist layer 206, there is the 5th opening 208 and the 6th opening 207, the 5th opening 208 and the 6th opening 206 are about the 3rd region 13 plane symmetry, described the 5th opening 208 exposes ground floor the first conductive layer 205 on the part ground floor first insulating barrier 202a of the first opening 204 and first area 11, described the 6th opening 207 exposes ground floor the first conductive layer 205 on the part ground floor first insulating barrier 202a of the second opening 203 and second area 12.

With reference to Figure 21, adopt electroplating technology, in the 5th opening 208 and the first opening 204 (with reference to Figure 20), form ground floor the first metal layer 210a, one end that the first with bottom metal layer 201 of described ground floor the first metal layer 210a is electrically connected to is the second end, one end not being electrically connected to bottom metal layer 201 of ground floor the first metal layer 210a is first end, in the 6th opening 207 and the second opening 203 (with reference to Figure 20), form ground floor the 3rd metal level 209a, one end that the second portion with bottom metal layer 201 of described ground floor the 3rd metal level 209a is electrically connected to is the second end, one end not being electrically connected to bottom metal layer of ground floor the 3rd metal level 209a is first end, ground floor the 3rd metal level 209a and ground floor the first metal layer 210a are about the 3rd region 13 plane symmetry.

The thickness of ground floor the first metal layer 210a and ground floor the 3rd metal level 209 equates, the thickness of ground floor the first metal layer 210a and ground floor the 3rd metal level 209a is 100 dust～5 millimeter, concrete, in one embodiment, the thickness of ground floor the first metal layer 210a and ground floor the 3rd metal level 209a can be 10 nanometer～3 millimeter, in another embodiment, the thickness of ground floor the first metal layer 210a and ground floor the 3rd metal level 209a can be 0.2 micron～0.5 millimeter.

With reference to Figure 22, remove described ground floor the first photoresist layer 206 (with reference to Figure 21); Etching is removed ground floor first conductive layer 205 of ground floor the first metal layer 210a and ground floor the 3rd metal level 209a both sides.

With reference to Figure 23, form ground floor the second insulating barrier 211a that covers described ground floor the first metal layer 210a, ground floor the 3rd metal level 209a and ground floor the first insulating barrier 202a, the 3rd opening 213 in described ground floor the second insulating barrier 211a with the first end surface that exposes ground floor the first metal layer 210a, and the 4th opening 212 that exposes the first end surface of ground floor the 3rd metal level 209a, described the 3rd opening 213 and the 4th opening 212 are about the 3rd region 13 plane symmetry.

The material of ground floor the second insulating barrier 211a is identical with the material of ground floor the first insulating barrier 202a, and both thickness equates.

With reference to Figure 24, on the sidewall of described the 3rd opening 213 and the 4th opening 212 and the surface of bottom and ground floor the second insulating barrier 211a, form ground floor the second conductive layer 214.

With reference to Figure 25, on ground floor the second conductive layer 214, form ground floor the second photoresist layer 215, in described ground floor the second photoresist layer 215, there is minion mouth 217 and octavo mouth 216, described minion mouth 217 and octavo mouth 216 are about the 3rd region 13 plane symmetry, described minion mouth 217 exposes ground floor the second conductive layer 214 on the 3rd opening 213 and ground floor the first metal layer 210a, and described octavo mouth 216 exposes ground floor the second conductive layer 214 on the 4th opening 212 and ground floor the 3rd metal level 209a.

With reference to Figure 26, adopt electroplating technology, in described minion mouth 217 and the 3rd opening 213 (with reference to Figure 25), form ground floor the second metal level 219a, one end being electrically connected to ground floor the first metal layer 210a of ground floor the second metal level 219a is first end, one end not being electrically connected to ground floor the first metal layer 210a of ground floor the second metal level 219a is the second end, in octavo mouth 216 and the 4th opening 212 (with reference to Figure 25), form ground floor the 4th metal level 218a, one end being electrically connected to ground floor the 3rd metal level 209a of ground floor the 4th metal level 218a is first end, one end not being electrically connected to the 3rd metal level 209a of ground floor of ground floor the 4th metal level 218a is the second end, ground floor the second metal level 219a and ground floor the 4th metal level 218a are about the 3rd region 13 plane symmetry.

Identical and the thickness of the material of ground floor the second metal level 219a and ground floor the 4th metal level 218a and ground floor the first metal layer 210a and ground floor the 3rd metal level 209 equates.

With reference to Figure 27, remove described ground floor the second photoresist layer 215 (with reference to Figure 25); Etching is removed ground floor second conductive layer 214 of ground floor the second metal level 219a and ground floor the 4th metal level 218a both sides.

With reference to Figure 28, form the second layer the first insulating barrier 202b that covers described ground floor the second metal level 219a, ground floor the 4th metal level 218a and ground floor the second insulating barrier 211a surface, first opening in the described second layer the first insulating barrier 202b with the second end surfaces that exposes ground floor the second metal level 219a, and the second opening that exposes ground floor the 4th metal level 218a the second end surfaces, on the second layer the first insulating barrier 202b surface in the first opening and above ground floor the second metal level 219a, form second layer the first metal layer 210b, one end being electrically connected to ground floor the second metal level 219a of described second layer the first metal layer 210b is the second end, one end that is not electrically connected to 219a with second layer the first metal layer of second layer the first metal layer 210b is first end, on the second layer the first insulating barrier 202b surface in the second opening and above ground floor the 4th metal level 218a, form the second layer the 3rd metal level 209b, one end being electrically connected to ground floor the 4th metal level 218a of the described second layer the 3rd metal level 209b is the second end, one end not being electrically connected to ground floor the 4th metal level 218a of the second layer the 3rd metal level 209b is first end, the second layer the 3rd metal level 209b and second layer the first metal layer 210b are about the 3rd region 13 plane symmetry,

Form the second layer the second insulating barrier 211b that covers described second layer the first metal layer 210b, the second layer the 3rd metal level 209b and the second layer the first insulating barrier 202b, in the described second layer the second insulating barrier 211b, there is the 3rd opening on the first end surface that exposes second layer the first metal layer 210b, and the 4th opening that exposes the first end surface of the second layer the 3rd metal level 209b, on the second layer the second insulating barrier 211b surface in described the 3rd opening and above second layer the first metal layer 210b, form the second layer the second metal level 219b, one end being electrically connected to second layer the first metal layer of the second layer the second metal level 219b is first end, one end not being electrically connected to second layer the first metal layer of the second layer the second metal level is the second end, on the second layer the second insulating barrier 211b surface in the 4th opening and above the second layer the 3rd metal level 209b, form the second layer the 4th metal level 218b, one end being electrically connected to the second layer the 3rd metal level 209b of the described second layer the 4th metal level 218b is first end, one end not being electrically connected to the second layer the 3rd metal level 209b of the described second layer the 4th metal level 218b is the second end, the second layer the 4th metal level 218b and the second layer the second metal level 219b are about the 3rd region 13 plane symmetry.

In the present embodiment, only using and form two-layer the first metal layer (comprising ground floor the first metal layer 210a and second layer the first metal layer 210b), two-layer the second metal level (comprising ground floor the second metal level 219a and the second layer the second metal level 219b), two-layer the 3rd metal level (comprising ground floor the 3rd metal level 209a and the second layer the second metal level 209b), two-layer the 4th metal level (comprising ground floor the 4th metal level 218a and the second layer the 4th metal level 218b) as example.

In other embodiments of the invention, the number of plies N of described the first metal layer, the second metal level, the 3rd metal level and the 4th metal level is greater than 2 layers.

Concrete, the forming process of described N (N >=2) layer the first metal layer and N (N >=2) layer the 3rd metal level is: form N layer the first insulating barrier that covers described N-1 layer the second metal level, N-1 layer the 4th metal level and N-1 layer the second surface of insulating layer, in described N layer the first insulating barrier, there is the first opening of the second end surfaces that exposes N-1 layer the second metal level, and the second opening that exposes N-1 layer the 4th metal level the second end surfaces; In the first opening and the second opening sidewalls and lower surface and N-1 layer the second surface of insulating layer, form N layer the first conductive layer; On N layer the first conductive layer, form N layer the first photoresist layer, in described N layer the first photoresist layer, there is the 5th opening and the 6th opening, described the 5th opening exposes N layer first conductive layer of the first opening and N-1 layer the second metal level top, and described the 6th opening exposes N layer first conductive layer of the second opening and N-1 layer the 4th metal level top; Adopt electroplating technology, in the 5th opening and the first opening, form N layer the first metal layer, one end being electrically connected to N-1 layer the second metal level of described N layer the first metal layer is the second end, one end not being electrically connected to N layer the first metal layer of N layer the first metal layer is first end, in the 6th opening and the second opening, form N layer the 3rd metal level, one end being electrically connected to N-1 layer the 4th metal level of described N layer the 3rd metal level is the second end, and one end not being electrically connected to N-1 layer the 4th metal level of N layer the 3rd metal level is first end; Remove described N layer the first photoresist layer; Etching is removed N layer first conductive layer of N layer the first metal layer and N layer the 3rd metal level both sides.

The forming process of described N (N >=2) layer the second metal level and N (N >=2) layer the 4th metal level is: form N layer the second insulating barrier that covers described N layer the first metal layer, N layer the 3rd metal level and N layer the first insulating barrier, in described N layer the second insulating barrier, there is the 3rd opening on the first end surface that exposes N layer the first metal layer, and the 4th opening that exposes the first end surface of N layer the 3rd metal level; On the sidewall of described the 3rd opening and the 4th opening and the surface of bottom and N layer the second insulating barrier, form N layer the second conductive layer; On N layer the second conductive layer, form N layer the second photoresist layer, in described N layer the second photoresist layer, there is minion mouth and octavo mouth, described minion mouth exposes N layer the second conductive layer on the 3rd opening and N layer the first metal layer, and described octavo mouth exposes N layer the second conductive layer on the 4th opening and N layer the 3rd metal level; Adopt electroplating technology, in described minion mouth and the 3rd opening, form N layer the second metal level, one end being electrically connected to N layer the first metal layer of N layer the second metal level is first end, one end not being electrically connected to N layer the first metal layer of N layer the second metal level is the second end, in octavo mouth and the 4th opening, form N layer the 4th metal level, one end being electrically connected to N layer the 3rd metal level of described N layer the 4th metal level is first end, and one end not being electrically connected to N layer the 3rd metal level of described N layer the 4th metal level is the second end; Remove described N layer the second photoresist layer; Etching is removed N layer second conductive layer of N layer the 4th metal level and N layer the second metal level both sides.

The first metal layer and the second metal level that at the some layers of formation (being more than or equal to two-layer), stack gradually, the 3rd metal level and the 4th metal level that during with some layers, (are more than or equal to two-layer) to stack gradually, the metal level that is positioned at the top layer on the first area 11 of support plate 200 can be the first metal layer or the second metal level, and the metal level that is positioned at the top layer on the second area 12 of support plate 200 can be the 3rd metal level or the 4th metal level.

Also comprise: on the top layer the first metal layer on the first area 11 of support plate 200 or the second layer on surface of metal, form the first pad, the first pad is as external first port of RFID antenna; On the 3rd metal level of the top layer on the second area 12 of support plate 200 or the 4th layer on surface of metal, form the second pad, the second pad is as the second external-connected port of RFID antenna; The 3rd metal level or the 4th metal level, the first insulating barrier of top layer or the top insulating layer of the second insulating barrier of the first metal layer of described the first pad of formation covering, the second pad, top layer or the second metal level, top layer, described top insulating layer exposes the top surface of the first pad and the second pad, and described top insulating layer is as a part for insulating barrier.

In other embodiments of the invention, also can be directly external the first port using the first metal layer of top layer on the first area of support plate 200 11 or the second metal level as RFID antenna, external the second port using the 3rd metal level of the top layer on the second area of support plate 200 12 or the 4th metal level as RFID antenna, the first external-connected port and the second external-connected port are follow-up to be electrically connected to radio frequency integrated chip.

In the present embodiment, the metal level that is positioned at first area 11 top layers of support plate 200 is the second metal level (second layer the second metal level 219b), the metal level that is positioned at top layer on the second area 12 of support plate 200 is the 4th metal level (second layer the 4th metal level 218b), on the second layer the second metal level 219b surface, form the first pad 222, the first pad 222 is as external the first port, on the surface of the second layer the 4th metal level 218b, form the second pad 221, the second pads 221 as external the second port; Form the top insulating layer 121 that covers the described second layer the second metal level 219b, the second layer the 4th metal level 218b, the first pad 222, the second pad 221, the second layer the second insulating barrier 211b.

With reference to Figure 29, Figure 29 is that Figure 28 removes the perspective view (the first conductive layer and the second conductive layer are not shown) after support plate 200, bottom metal layer 201 comprises first 21, second portion 22 and the third part 23 being connected, first 21 is positioned on the surface, first area 11 (with reference to Figure 12) of support plate 200, second portion 22 is positioned on second area 12 (with reference to Figure 12) surface of support plate 200, third part 23 is positioned on the surface in the 3rd region 13 (with reference to Figure 12) of support plate 200, and first 21 and second portion 22 are about third part 23 plane symmetry.

First 21 specifically refers to about third part 23 plane symmetry with second portion 22: do the reference planes on vertical and bottom metal layer 201 surfaces, and described reference planes divide third part 23 for symmetrical two parts equally.

In conjunction with reference to Figure 29 and Figure 30, remove described support plate 200 (with reference to Figure 28), along the first 21 across bottom metal layer 201, the direction of second portion 22 and third part 23, cut described the second metal level (comprising ground floor the second metal level 219a and the second layer the second metal level 219b), the first metal layer (comprising ground floor the first metal layer 210a and second layer the first metal layer 210b), the 4th metal level (comprising ground floor the 4th metal level 218a and the second layer the 4th metal level 218b), the 3rd metal level (comprising ground floor the 3rd metal level 209a and the second layer the second metal level 209b), bottom metal layer 201 and insulating barrier (comprise ground floor the first insulating barrier 202a, ground floor the second insulating barrier 211a, the second layer the first insulating barrier 202b, the second layer the second insulating barrier 211b, top insulating layer 220), form some discrete RFID antenna 14, the first metal layer of top layer or the second metal level are as external first port of RFID antenna 14, the 3rd metal level of top layer or the 4th metal level 14 are as external second port of RFID antenna.

In the present embodiment, when forming ground floor the first metal layer 210a and ground floor the 3rd metal level 209a, the first end of ground floor the first metal layer 210a is electrically connected to the first 21 of bottom metal layer 101, the second end of ground floor the first metal layer 210a is positioned at the third part 23 of the upper and close bottom metal layer 201 of ground floor the first insulating barrier 202a, the first end of ground floor the 3rd metal level 209 is electrically connected to the second portion 22 of bottom metal layer 101, the second end of ground floor the 3rd metal level 209 is positioned at the third part 23 of the upper and close bottom metal layer 201 of ground floor the first insulating barrier 202a.

In other embodiments of the invention, please refer to Figure 31, when forming ground floor the first metal layer 210a and ground floor the 3rd metal level 209a, the first end of ground floor the first metal layer 210a is electrically connected to the first 21 of bottom metal layer 101, it is upper and away from the third part 23 of bottom metal layer 201 that the second end of ground floor the first metal layer 210a is positioned at ground floor the first insulating barrier 202a, the first end of ground floor the 3rd metal level 209 is electrically connected to the second portion 22 of bottom metal layer 101, it is upper and away from the third part 23 of bottom metal layer 201 that the second end of ground floor the 3rd metal level 209 is positioned at ground floor the first insulating barrier 202a.

In other embodiments of the invention, described support plate 200 can retain, and cuts described support plate 200 when cutting simultaneously, and after cutting, remaining support plate 200 is as a part for RFID antenna 14.

With reference to Figure 32, provide radio frequency integrated chip 122; Radio frequency integrated chip 122 is electrically connected to the first external-connected port (the first pad 222) and second external-connected port (the second pad 221) of RFID antenna 14.

Described radio frequency integrated chip 122 comprises first interface 124 and the second interface 123, by lead key closing process, form the first metal wire 223 and the second metal wire 224, described the first metal wire 223 is electrically connected to external first port 222 of RFID antenna 14 with the first interface 124 of radio frequency integrated chip 122, described the second metal wire 224 is electrically connected to external second port 221 of RFID antenna 14 with radio frequency integrated chip 122 second interfaces 123.

It should be noted that, other descriptions and restriction about RFID antenna in the present embodiment please refer to previous embodiment, do not repeat them here.

The embodiment of the present invention also provides a kind of RFID antenna, please refer to Figure 32, comprising:

Bottom metal layer 201, described bottom metal layer 201 comprises first 21, second portion 22 and the third part 23 being connected, first 21 and second portion 22 are about third part 23 plane symmetry;

Be positioned at some stacking the first metal layer (comprising ground floor the first metal layer 210a and second layer the first metal layer 210b) and the second metal levels (comprising ground floor the second metal level 219a and the second layer the second metal level 219b) of replacing successively in the first 21 of bottom metal layer 201, the first metal layer includes first end and second end relative with first end with the second metal, the second end of ground floor the first metal layer 210a is electrically connected to the first 21 of bottom metal layer 201, the first end of the second metal level of N (N >=1) layer is electrically connected to the first end of the first metal layer of N layer, the second end of the first metal layer of N+1 layer is electrically connected to second metal level the second end of N layer, the first end of the second metal level of N+1 layer is electrically connected to the first end of the first metal layer of N+1 layer,

Be positioned at some the 3rd stacking metal level (comprising ground floor the 3rd metal level 209a and the second layer the 3rd metal level 209b) and the 4th metal levels (comprising ground floor the 4th metal level 218a and the second layer the 4th metal level 218b) of replacing successively on the second portion 22 of bottom metal layer 201, the 3rd metal level includes first end and second end relative with first end with the 4th metal, the second end of ground floor the 3rd metal level 209a is electrically connected to the second portion 22 of bottom metal layer 201, the 4th first end of metal level of N (N >=1) layer and the first end of the 3rd metal level of N layer are electrically connected to, the second end of the 3rd metal level of N+1 layer is electrically connected to the 4th metal level the second end of N layer, the 4th first end of metal level of N+1 layer and the first end of the 3rd metal level of N+1 layer are electrically connected to, and the 3rd metal level of the first metal layer of same layer and same layer is about third part plane symmetry, the 4th metal level of the second metal level of same layer and same layer is about third part plane symmetry, the first metal layer of top layer or the second metal level are as external first port of RFID antenna, and the 3rd metal level of top layer or the 4th metal level are as external second port of RFID antenna,

Insulating barrier 226, described insulating barrier 226 is by bottom metal layer 201, the first metal layer, the second metal level, the 3rd metal level and the 4th metal level electric isolation.

In the present embodiment, in first 21 with bottom metal layer 201, there is two-layer the first metal layer and two-layer the second metal level, on the second portion of bottom metal layer 201, there is two-layer the second metal level and two-layer the 4th metal level as example, two-layer the first metal layer comprises ground floor the first metal layer 210a and second layer the first metal layer 210b, two-layer the second metal level comprises ground floor the second metal level 219a and the second layer the second metal level 219b, ground floor the first metal layer 210a, ground floor the second metal level 219a, second layer the first metal layer 210b, the second layer the second metal level 219b stacks gradually distribution in the first 21 of bottom metal layer 201, ground floor the first metal layer 210a, ground floor the second metal level 219a, second layer the first metal layer 210b, the second layer the second metal level 219b includes the second segment that first end is relative with first end and (comprises ground floor the first insulating barrier 202a by insulating barrier 226, ground floor the second insulating barrier 203a, the second layer the first insulating barrier 202b, the second layer the second insulating barrier 203b) electric isolation, two-layer the 3rd metal level comprises ground floor the 3rd metal level 209a and the second layer the second metal level 209b, two-layer the 4th metal level comprises ground floor the 4th metal level 218a and the second layer the 4th metal level 218b, ground floor the 3rd metal level 209a, ground floor the 4th metal level 218a, the second layer the second metal level 209b and the second layer the 4th metal level 218b stack gradually distribution on the second portion 22 of bottom metal layer 201, ground floor the 3rd metal level 209a, ground floor the 4th metal level 218a, the second layer the second metal level 209b includes first end with the second layer the 4th metal level 218b and also by insulating barrier 226, (comprises ground floor the first insulating barrier 202a with the second end relative with first end, ground floor the second insulating barrier 203a, the second layer the first insulating barrier 202b, the second layer the second insulating barrier 203b) electric isolation.Concrete, ground floor the first insulating barrier 202a covers described bottom metal layer 201, in ground floor the first insulating barrier 202a, there is first opening in described ground floor the first insulating barrier 202a with the first surface of the bottom metal layer 201 exposing on first area 11, and the second opening that exposes second portion 12 surfaces of the bottom metal layer 201 on second area 12, the first opening and the second opening are about third part 23 plane symmetry, be positioned at the lip-deep ground floor the first metal layer of part ground floor the first insulating barrier 202a 210a in the first opening Nei He first 21, one end that the first with bottom metal layer 201 of described ground floor the first metal layer 210a is electrically connected to is the second end, one end not being electrically connected to bottom metal layer 201 of ground floor the first metal layer 210a is first end, be positioned at the lip-deep ground floor of part ground floor the first insulating barrier 202a the 3rd metal level 209a on the second opening and second portion 22, one end that the second portion with bottom metal layer 201 of described ground floor the 3rd metal level 209a is electrically connected to is the second end, one end not being electrically connected to bottom metal layer of ground floor the 3rd metal level 209a is first end, ground floor the 3rd metal level 209a and ground floor the first metal layer 210a are about the 3rd region 13 plane symmetry, cover ground floor the second insulating barrier 211a of described ground floor the first metal layer 210a, ground floor the 3rd metal level 209a and ground floor the first insulating barrier 202a, the 3rd opening in described ground floor the second insulating barrier 211a with the first end surface that exposes ground floor the first metal layer 210a, and the 4th opening that exposes the first end surface of ground floor the 3rd metal level 209a, described the 3rd opening and the 4th opening are about the 3rd region 13 plane symmetry, be positioned at the lip-deep ground floor second metal level 219a of ground floor the second insulating barrier 211a of the 3rd opening and ground floor the first metal layer 210a layer top, one end being electrically connected to ground floor the first metal layer 210a of ground floor the second metal level 219a is first end, one end not being electrically connected to ground floor the first metal layer 210a of ground floor the second metal level 219a is the second end, the lip-deep ground floor of ground floor the second insulating barrier 211a the 4th metal level 218a above the 4th opening and ground floor the 3rd metal level 209a, one end being electrically connected to ground floor the 3rd metal level 209a of ground floor the 4th metal level 218a is first end, one end not being electrically connected to the 3rd metal level 209a of ground floor of ground floor the 4th metal level 218a is the second end, ground floor the second metal level 219a and ground floor the 4th metal level 218a are about the 3rd region 13 plane symmetry, cover the second layer first insulating barrier 202b on described ground floor the second metal level 219a, ground floor the 4th metal level 218a and ground floor the second insulating barrier 211a surface, in the described second layer the first insulating barrier 202b, there is the first opening of the second end surfaces that exposes ground floor the second metal level 219a, and the second opening that exposes ground floor the 4th metal level the second end 218a surface, be arranged in the lip-deep second layer the first metal layer of the second layer the first insulating barrier 202b 210b of the first opening and ground floor the second metal level 219a top, one end being electrically connected to ground floor the second metal level 219a of described second layer the first metal layer 210b is the second end, one end that is not electrically connected to 219a with second layer the first metal layer of second layer the first metal layer 210b is first end, be arranged in the lip-deep second layer of the second layer the first insulating barrier 202b the 3rd metal level 209b of the second opening and ground floor the 4th metal level 218a top, one end being electrically connected to ground floor the 4th metal level 218a of the described second layer the 3rd metal level 209b is the second end, one end not being electrically connected to ground floor the 4th metal level 218a of the second layer the 3rd metal level 209b is first end, the second layer the 3rd metal level 209b and second layer the first metal layer 210b are about the 3rd region 13 plane symmetry, cover the second layer the second insulating barrier 211b of described second layer the first metal layer 210b, the second layer the 3rd metal level 209b and the second layer the first insulating barrier 202b, in the described second layer the second insulating barrier 211b, there is the 3rd opening on the first end surface that exposes second layer the first metal layer 210b, and the 4th opening that exposes the first end surface of the second layer the 3rd metal level 209b, be arranged in the lip-deep second layer second metal level 219b of the second layer the second insulating barrier 211b of described the 3rd opening and second layer the first metal layer 210b top, one end being electrically connected to second layer the first metal layer of the second layer the second metal level 219b is first end, one end not being electrically connected to second layer the first metal layer of the second layer the second metal level is the second end, be arranged in the lip-deep second layer of the second layer the second insulating barrier 211b the 4th metal level 218b of the 4th opening and the second layer the 3rd metal level 209b top, one end being electrically connected to the second layer the 3rd metal level 209b of the described second layer the 4th metal level 218b is first end, one end not being electrically connected to the second layer the 3rd metal level 209b of the described second layer the 4th metal level 218b is the second end, the second layer the 4th metal level 218b and the second layer the second metal level 219b are about the 3rd region 13 plane symmetry.

In other embodiments of the invention, the number of plies N of described the first metal layer, the second metal level, the 3rd metal the layer by layer with four metal level is greater than two-layer.The number of plies N of corresponding the first insulating barrier and the second insulating barrier is also greater than two-layer.

The material of described insulating barrier 226 is photosensitive polyimides glue, epoxide-resin glue, benzocyclobutene glue or polybenzoxazoles glue.

The material of described bottom metal layer 201, the first metal layer, the second metal level, the 3rd metal level and the 4th metal level is one or more in Al, Cu, Ag, Au, Pt, W.

The thickness of every one deck the first metal layer, the second metal level, the 3rd metal level and the 4th metal level is 100 dust～5 millimeter, the distance of adjacent the first metal layer and the second metal level is 200 dust～5 millimeter, and the 3rd adjacent metal level and the distance of the 4th metal level are 200 dust～5 millimeter.

Also comprise: radio frequency integrated chip 122, described radio frequency integrated chip 122 comprises first interface 124 and the second interface 123, external first port of RFID antenna 14 (or first pad 222) is electrically connected to the first interface 124 of radio frequency integrated chip 122 by the first metal wire 223, and external second port of RFID antenna 14 (or second pad 221) is electrically connected to radio frequency integrated chip 122 second interfaces 123 by the second metal wire 224.

RFID antenna in the present embodiment has symmetrical structure, and (the 3rd metal level of the first metal layer of same layer and same layer is about third part plane symmetry, the 4th metal level of the second metal level of same layer and same layer is about third part plane symmetry), be conducive to reduce outside noise jamming, when receiving and send radio frequency model, improved accuracy and the stability of the radiofrequency signal of transmission.

Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, so protection scope of the present invention should be as the criterion with claim limited range.

Claims

1. a RFID antenna, is characterized in that, comprising:

Bottom metal layer, described bottom metal layer comprises the second portion that He Yu first of first is connected;

Be positioned at some stacking the first metal layer and the second metal levels of replacing successively in the first of bottom metal layer, the first metal layer includes first end and second end relative with first end with the second metal level, the second end of ground floor the first metal layer is electrically connected to the first of bottom metal layer, the first end of the second metal level of N (N >=1) layer is electrically connected to the first end of the first metal layer of N layer, the second end of the first metal layer of N+1 layer is electrically connected to second metal level the second end of N layer, the first end of the second metal level of N+1 layer is electrically connected to the first end of the first metal layer of N+1 layer,

Insulating barrier, described insulating barrier is by bottom metal layer, the first metal layer and the isolation of the second metal level;

Be arranged in the metal connecting layer of the insulating barrier on the second portion of bottom metal layer, the bottom of described metal connecting layer is electrically connected to the second portion of bottom metal layer, the top of described metal connecting layer is as external second port of RFID antenna, and the first metal layer of top layer or the second metal level are as external first port of RFID antenna.

2. RFID antenna as claimed in claim 1, is characterized in that, the material of described insulating barrier is photosensitive polyimides glue, epoxide-resin glue, benzocyclobutene glue or polybenzoxazoles glue.

3. RFID antenna as claimed in claim 1, is characterized in that, the material of described bottom metal layer, the first metal layer, the second metal level, metal connecting layer is one or more in Al, Cu, Ag, Au, Pt, W.

4. RFID antenna as claimed in claim 1, is characterized in that, the thickness of every one deck the first metal layer and the second metal level is 100 dust～5 millimeter, and the distance of adjacent the first metal layer and the second metal level is 200 dust～5 millimeter.

5. RFID antenna as claimed in claim 1, it is characterized in that, also comprise: radio frequency integrated chip, described radio frequency integrated chip comprises first interface and the second interface, external first port of RFID antenna is electrically connected to the first interface of radio frequency integrated chip by the first metal wire, and external second port of RFID antenna is electrically connected to radio frequency integrated chip the second interface by the second metal wire.

6. a RFID antenna, is characterized in that, comprising:

Bottom metal layer, described bottom metal layer comprises first, second portion and the third part being connected, first and second portion are about third part plane symmetry;

Be positioned at some stacking the first metal layer and the second metal levels of replacing successively in the first of bottom metal layer, the first metal layer includes first end and second end relative with first end with the second metal, the second end of ground floor the first metal layer is electrically connected to the first of bottom metal layer, the first end of the second metal level of N (N >=1) layer is electrically connected to the first end of the first metal layer of N layer, the second end of the first metal layer of N+1 layer is electrically connected to second metal level the second end of N layer, the first end of the second metal level of N+1 layer is electrically connected to the first end of the first metal layer of N+1 layer,

Be positioned at some the 3rd stacking metal level and the 4th metal levels of replacing successively on the second portion of bottom metal layer, the 3rd metal level includes first end and second end relative with first end with the 4th metal, the second end of ground floor the 3rd metal level is electrically connected to the second portion of bottom metal layer, the 4th first end of metal level of N (N >=1) layer and the first end of the 3rd metal level of N layer are electrically connected to, the second end of the 3rd metal level of N+1 layer is electrically connected to the 4th metal level the second end of N layer, the 4th first end of metal level of N+1 layer and the first end of the 3rd metal level of N+1 layer are electrically connected to, and the 3rd metal level of the first metal layer of same layer and same layer is about third part plane symmetry, the 4th metal level of the second metal level of same layer and same layer is about third part plane symmetry, the first metal layer of top layer or the second metal level are as external first port of RFID antenna, and the 3rd metal level of top layer or the 4th metal level are as external second port of RFID antenna,

Insulating barrier, described insulating barrier is by bottom metal layer, the first metal layer, the second metal level, the 3rd metal level and the 4th metal level electric isolation.

7. RFID antenna as claimed in claim 6, is characterized in that, the material of described insulating barrier is photosensitive polyimides glue, epoxide-resin glue, benzocyclobutene glue or polybenzoxazoles glue.

8. RFID antenna as claimed in claim 6, is characterized in that, the material of described bottom metal layer, the first metal layer, the second metal level, the 3rd metal level and the 4th metal level is one or more in Al, Cu, Ag, Au, Pt, W.

9. RFID antenna as claimed in claim 6, it is characterized in that, the thickness of described the first metal layer, the second metal level, the 3rd metal level and the 4th metal level is 100 dust～5 millimeter, the distance of adjacent the first metal layer and the second metal level is 200 dust～5 millimeter, and the 3rd adjacent metal level and the distance of the 4th metal level are 200 dust～5 millimeter.

10. RFID antenna as claimed in claim 9, it is characterized in that, also comprise: radio frequency integrated chip, described radio frequency integrated chip comprises first interface and the second interface, external first port of RFID antenna is electrically connected to the first interface of radio frequency integrated chip by the first metal wire, and external second port of RFID antenna is electrically connected to radio frequency integrated chip the second interface by the second metal wire.