JP5176465B2 - Non-contact IC tag and non-contact IC tag encoding method - Google Patents

Description

  The present invention relates to a contactless IC tag and a method for encoding a contactless IC tag. Specifically, the present invention relates to a non-contact IC tag or the like provided with an antenna dedicated to proximity writing in addition to a normal dipole antenna in a UHF band or microwave band non-contact IC tag.

  The non-contact IC tag is also referred to as an RFID (Radio Frequency Identification), and relates to a tag that includes an IC chip that holds information capable of identifying an individual and can read this information by wireless communication in a non-contact manner. Such IC tags are used, for example, in the fields of transportation, distribution, warehouses, factory process management, and handling of luggage.

In recent years, in addition to the conventional 13.56 MHz band or microwave band (2.45 GHz) non-contact IC tag, it has become possible to use the UHF band (952 M to 955 MHz) in Japan due to the revision of the law. Band non-contact IC tags are being put to practical use.
The UHF band IC tag can be collectively read from a long distance (3 to 5 meters) as compared to the electromagnetic induction type 13.56 MHz band non-contact IC tag. Further, the microwave band IC tag can communicate at a distance of 1 to 1.5 meters, and is expected to be widely used in applications that take advantage of these features in the future.
In the classification of radio waves, the UHF band indicates 300 M to 3 GHz, but in the case of an IC tag, it often refers to a tag using 860 M to 960 MHz. An IC tag using the 2.45 GHz band included in the above range is not normally called an UHF band IC tag.

The frequency band in Japan that can use the UHF band IC tag can use 2MHz of 952M to 954MHz for high output type and 3MHz of 952M to 955MHz for low output type by amendment of Radio Law in April 2005. The UHF band IC tag had problems such as the weak response wave of the IC tag being interfered by the transmission wave of other reader / writers, and it was pointed out that it was difficult to read. This prevents this interference.
In other words, the new law adopts the carrier sense method, which requires LBT (Listen Before Talk) to check whether other readers are emitting radio waves before the leaders send radio waves. It is considered that reader / writer devices corresponding to such a new method are also being sold, and the spread of UHF band IC tags is promoted.

  By the way, in the case of UHF band IC tags, there is an advantage that reading from a long distance (3 to 5 meters) is possible as described above, but conversely, when writing from a short distance of about 1 cm to 30 cm, There arises a problem of erroneous writing to the non-contact IC tag. In particular, when writing to an IC tag concatenation that is initially manufactured after IC tags are formed continuously (usually, encoding processing by a manufacturer or continuous writing processing before the start of use by a user), between IC tags. Since the interval is about 2 cm to 5 cm, it is difficult to specify and write one IC tag, and it is necessary to write the target IC tag while strictly shielding it from other IC tags. There's a problem.

  FIG. 9 is a diagram for explaining a conventional UHF band IC tag writing method. In FIG. 9, it seems that the reader / writer 10C is placed in the lateral direction in the same plane as the IC tag connecting body 1R. However, in actuality, both antenna surfaces are placed facing each other in parallel. I want you to see it. Conventionally, different data for each target IC tag is sequentially written while intermittently sending the IC tag connecting body 1R in such a state (for example, in the direction of arrow A). In this case, since the radiation range of the radio wave (C3) of the reader / writer 10C capable of long-distance writing is wide and a plurality of IC tags are included in the range, it is difficult to write to a specific IC tag.

  It is considered that a model such as a proximity write only reader / writer for UHF band IC tags is not commercially available at present. Normally, the output of the handy reader / writer is reduced and other IC tags are shielded and written so as to communicate only to the target IC tag as described above from a relatively short distance, It is performed to separate the IC tag. The microwave band (2.45 GHz) is used in the same way although the communication distance is somewhat shortened.

Therefore, in the present invention, the UHF band IC tag and the microwave band tag are usually provided with a dipole antenna, a one-wavelength loop antenna, and another proximity write antenna for writing from a short distance to the IC tag. It is an object to write with the antenna.
Although the prior art directly related to the present application cannot be detected, Patent Documents 1 to 3 and the like exist regarding UHF band RFID tags. Patent Document 1 describes basic matters regarding an information card having a dipole antenna, and Patent Document 2 describes a technique for adjusting impedance by providing a stub between a dipole antenna and a connection line. 3 describes that an impedance adjustment pattern is provided at the tip of the dipole antenna. However, none is directly related to the present application.

JP-A-2-19989 Japanese Patent Publication No. 3-71807 JP 2004-104344 A

  As described above, a non-contact IC tag that can reliably write to a target IC tag even when continuously writing in a state where UHF band or microwave band non-contact IC tags are connected. It aims at realization.

The first of the gist of the present invention for solving the above problems is a UHF band or microwave band non-contact type having a half-wave dipole antenna on the base film surface and mounting an IC chip between the left and right quarter-wave antennas. In the IC tag, a small write-only antenna having a total length of 1/3 to 1/10 of the total length of the half-wave dipole antenna connected to the same pad of the IC chip is placed on the same surface of the base film. The contactless IC tag is formed so as to be parallel or orthogonal to the half-wave dipole antenna .

The second of the gist of the present invention for solving the above problems is a UHF band or microwave having a dipole antenna having radiation portions at both ends on the base film surface and mounting an IC chip between the left and right dipole antennas. In a band non-contact IC tag, a small write-only antenna having a total antenna length that is 2/3 to 1/10 of the total length of the dipole antenna connected to the same pad of the IC chip is placed on the same surface of the base film. The non-contact IC tag is formed so as to be parallel or orthogonal to the dipole antenna .

A third aspect of the present invention that solves the above problem is a UHF band or a microwave band that has a dipole antenna having a curved shape on the surface of the base film and has an IC chip mounted between the left and right dipole antennas. In a contact IC tag, a small bar-shaped proximity writing dedicated antenna having a total antenna length of 2/3 to 1/10 of the total length of the dipole antenna connected to the same pad of the IC chip is connected to the same surface of the base film. In the non-contact IC tag, the feeding angle of the dipole antenna is formed so that the angle α between the bars is 45 ° to 180 ° .

A fourth aspect of the present invention that solves the above problem is a UHF band or microwave band non-contact IC tag having a one-wavelength loop antenna on the base film surface and having an IC chip mounted between the antennas. Connected to the same pad of the chip, a small bar-shaped proximity writing dedicated antenna having a total length of 1/5 to 1/20 of the total length of the one-wavelength loop antenna , on the same surface of the base film, The non-contact IC tag is formed so as to be parallel to the feeding portion of the one-wavelength loop antenna .

Fifth aspect of the present invention to solve the above problems, a claim 1 to the encoding method of any UHF band or microwave band non-contact IC tag according to claim 4, articulation of the non-contact IC tag relative proximity write-only antenna 1 of the non-contact IC tag in the connecting state of the body, by using the reader-writer of the communication distance 3 to 10 cm, and radiates a radio wave at a position near. 1 to 5 cm, encoding And a non-contact IC tag encoding method.

The non-contact IC tag of the present invention has a dedicated proximity write antenna that is smaller than a normal dipole antenna or single-wavelength loop antenna. This can be done reliably and efficiently from a position close to the writer.
An encoding method for a non-contact IC tag according to the present invention is a connected body of a non-contact IC tag having an IC chip mounted on a feeding portion of a dipole antenna or a one-wavelength loop antenna and a small proximity write dedicated antenna connected to the IC chip. For a non-contact IC tag in a connected state of 1) , using a reader / writer with a communication distance of 3 to 10 cm and radiating radio waves in the proximity of 1 to 5 cm, it is reliable and efficient Can be encoded.

Embodiments of the present invention will be described below. In the following description, the first form uses a half-wave dipole antenna, and the second and third forms use a dipole antenna that does not satisfy the half-wave requirement for the purpose of widening the bandwidth. The fourth form means that a one-wavelength loop antenna is used.
The first form corresponds to claim 1, the second and third forms correspond to claim 2, and the fourth form corresponds to claim 3.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
1 is a plan view showing a first form of a non-contact IC tag of the present invention, FIG. 2 is a plan view showing another example of the first form, and FIG. 3 is a cross-sectional view taken along line AA in FIG. 4 is a plan view showing the second embodiment, FIG. 5 is a plan view showing another example of the second embodiment, FIG. 6 is a plan view showing the third embodiment, and FIG. FIG. 8 is a plan view showing the form 4 and FIG.

  FIG. 1 is a plan view showing a first form of a non-contact IC tag according to the present invention. As shown in FIG. 1, a half-wave dipole antenna 2 made of a metal foil conductor is formed on the surface of a base film 11 that is a dielectric. In the case of FIG. 1, a pair of left and right quarter-wave antennas 2L and 2R are single dipoles extending in parallel, and an IC chip 4 is mounted between the joints (feeding portions) 2a and 2b of the antennas 2L and 2R (electrical Connected). The IC chip 4 stores the written data and performs data communication through the dipole antenna 2. In addition, a DC power source that is DC-converted by a diode or a capacitor inside the IC chip is acquired from radio waves. It also has the function of adjusting the impedance with the antenna.

The antennas 2L and 2R can adopt various shapes. The bent structure as shown in FIG. 1 is also called a meander structure. Although it does not have to be a bent shape, EPC Global defines the length to be within 4 inches, and is often folded or curved. The width (base material base width) is set to about 1 inch. In FIG. 1, only the single-leaf non-contact IC tag 1 is shown, but at the time of encoding, it is in a connected state as shown in FIG. 9. The same applies to the non-contact IC tags shown in FIGS.
The non-contact IC tag 1 of the present invention is characterized in that a proximity write dedicated antenna 3 smaller than the half-wave dipole antenna 2 is provided in a region close to the IC chip 4. The antenna 3 also includes left and right dipole antennas 3L and 3R, which are connected to the same pads as the antennas 2L and 2R of the IC chip 4, respectively.

  The dipole antenna 2 is set to have a shape in which a current distribution of a half wavelength of the irradiated radio wave is generated. For example, when the UHF band is 954 MHz, one wavelength is 31.4 cm, and a half wavelength is 15.7 cm. When this condition is satisfied, resonance with radio waves is efficiently generated. In principle, the total of the folded line segments of the pair of left and right quarter-wave antennas 2L and 2R is designed to have such a length. One unit of the IC tag of the folded antenna is manufactured to a size (base material size) of about 10 cm in length and about 1 inch to 3 to 4 cm in width. However, as will be described later, for the purpose of realizing a wide band compatible with the bands in Japan and foreign countries, the total length of both line segments may be designed not to match the wavelength. In the case of the microwave band (2.45 GHz), the antenna has a shorter shape.

Further, it has been confirmed that even a small antenna that is not designed according to the calculated value and does not cause resonance can receive radio waves in the UHF band or the microwave band at a distance close to the reader / writer. The proximity write dedicated antenna 3 is based on such a concept, and is provided at a position close to the IC chip 4. The proximity write only antenna 3 may have a shape similar to that of the antenna 2 as shown in FIG. 1 or may be a simple bar pattern. It has been confirmed that when the entire length of the proximity writing antenna 3 is about 1/3 to 1/10 of the half-wavelength dipole antenna 2, erroneous writing does not occur and moderate sensitivity can be maintained. When the proximity write dedicated antenna 3 is provided, the entire structure including the dipole antenna 2 and the dedicated antenna 3 is connected to the pad of the IC chip 4, so that in the case of long-distance communication, the overall shape functions as one antenna that causes resonance. Need to be designed to do.
The position close to the IC chip 4 means that the proximity write dedicated antenna 3 of about 1/3 to 1/10 of the half-wave dipole antenna 2 is closest to the IC chip 4 and the IC chip 4 is point-symmetric. Alternatively, it means that the antennas 3L and 3R on both sides are formed in line symmetry. The same applies to the following second, third, and fourth embodiments.

  FIG. 2 is a plan view showing another example of the first embodiment. In the embodiment of FIG. 2, the proximity write only antenna 3 is formed in a direction orthogonal to the dipole antenna 2. In general, since the dipole antenna has directivity in a direction orthogonal to the length, the mutual influence can be reduced if the direction is orthogonal to the antenna 2.

  3 is a cross-sectional view taken along line AA in FIG. The quarter wavelength antennas 2L and 2R are formed on the surface of the base film 11, and the IC chip 4 is attached to the joints 2a and 2b. A surface protective sheet 5 is laminated on the surfaces of the IC chip 4 and the dipole antenna 2 via an adhesive layer 6. In FIG. 3, it appears that there is a gap between the dipole antenna 2 and the adhesive layer 6, but in actuality it is in close contact. Although not shown, it is usual to provide an adhesive layer and release paper on the side of the base film 11 opposite to the antenna 2 so that it can be used as a label.

4A and 4B are plan views showing the second embodiment, in which FIG. 4A is an overall view, and FIG. 4B is an enlarged view of the periphery of the IC chip (dashed ellipse in FIG. 4A). It is. Although the sectional view is not shown, when the antenna 2 made of a metal foil conductor is formed on the surface of the base film 11 which is a dielectric, and the surface protection sheet 5 is laminated via the adhesive layer 6, it is the same as FIG. Can be analogized.
The second form also includes the dipole antenna 2, but the total length L of the antennas 2L and 2R is about 88 mm (in the case of FIG. 4), and is not designed to be a half wavelength of the UHF band frequency. However, L can be designed in the range of about 60 mm to 160 mm.
The dipole antenna shape that does not have the proximity write antenna 3 is practically used for a UHF band non-contact IC tag and registered as a design (design registration Nos. 1292777 and 1292978).

The dipole antennas 2L and 2R in FIG. 4 have radiating portions Lm and Rm that are widened at the tip portions. The radiating portions Lm and Rm are made of a thin metal foil conductor like a normal dipole antenna and have a size of about 20 mm × 22 mm. The radiating portions Lm and Rm are used to radiate and absorb radio waves as so-called radiation plates. By providing the planar radiating portions Lm and Rm, current paths of various lengths are formed in the inside thereof, which is substantially the same as providing a circuit having a plurality of path lengths, thereby achieving a wide band. It will be.
The frequency band of the UHF band is 952 to 955 MHz in Japan, but is 902 to 928 MHz in the United States and 865 to 868 MHz in Europe, which are different from each other. The radiation portions Lm and Rm can be adapted to such a band in each country.

As shown in FIG. 4B, the pads of the IC chip (semiconductor) 4 are electrically connected to the joint portions (power feeding portions) 2a and 2b. The IC chip 4 has a planar size of about 0.5 mm square or smaller than that. However, an interposer in which a part of an antenna is formed on a base material and an IC chip is mounted may be used to mount the antenna on the power feeding portion.
The patterns 2c and 2d are conductor patterns provided for stabilizing the position of the mounted IC chip 4, and are formed simultaneously with a metal foil of the same material as the antenna, but do not have an electrical role. A circuit that bypasses the upper side of the joint portions (feeding portions) 2a and 2b of the IC chip 4 is an impedance matching circuit 8, and is provided for matching (matching) the impedance of the IC chip 4 and the impedance of the antenna 2. . However, when there is no need for matching, the impedance matching circuit 8 may not be formed.

The left and right antennas 3L and 3R of the proximity write dedicated antenna 3 are also electrically connected to the joints (feeding portions) 2a and 2b. The joint portions (feeding portions) 2 a and 2 b are made of a thin metal foil conductor like the dipole antenna 2 and can be formed simultaneously with the antenna 2.
In the case of FIG. 4, bar-shaped proximity write dedicated antennas (each having a length of 10 to 12 mm) 3L and 3R are formed in parallel with the dipole antennas 2L and 2R, but the length is 2 of the dipole antennas 2L and 2R. The total length may be from / 3 to 1/10. The total length of the antennas 3L and 3R is 10 mm or more and less than 60 mm. It has been confirmed that the performance is about 1/4 or less compared to an antenna of 88 mm at about 60 mm.

FIG. 5 is a plan view showing another example of the second embodiment. In the case of FIG. 5, the dipole antennas 2 </ b> L and 2 </ b> R have substantially the same shape as FIG. 4, but do not have the impedance matching circuit 8.
The left and right antennas 3L and 3R of the proximity write dedicated antenna 3 are electrically connected to the joint portions (feeding portions) 2a and 2b, but are formed to be orthogonal to the dipole antenna 2. This is because the impedance matching circuit 8 is not provided and can be formed in the orthogonal direction. However, even when the impedance matching circuit 8 is provided, it can be formed on the side surface opposite to the dipole antenna 2 through the base film 11 that is a dielectric.

FIG. 6 is a plan view showing the third embodiment. An enlarged view of the periphery of the IC chip 4 is the same as FIG. FIG. 6 is also a dipole antenna, but has a curved shape. This shape can also be realized in a wide band with the shape obtained by simulation. This dipole antenna shape that does not have the proximity write antenna 3 is also practically used for the UHF band IC tag (design registration No. 1296413).
The total length (linear distance) L of the left and right antennas is about 88 mm, but is similarly variable in the range of about 60 mm to 160 mm. The thickness of the curve is about 4 mm. The integrated length of the bent curve is about 120 mm, but it is not designed to be a half wavelength of the UHF band frequency. In the case of FIG. 6, the proximity write-only antenna 3 protrudes from the joint portions (feeding portions) 2 a and 2 b so that the angle α between the bar-shaped antennas 3 </ b> L and 3 </ b> R is 60 °. When the proximity write-only antenna 3 is not linear, the directivity is reduced, but it is sufficient that the antenna has a certain degree of sensitivity, so α may be changed in the range of 45 ° to 180 °.

FIG. 7 is a plan view showing the fourth embodiment. An enlarged view around the IC chip is the same as FIG. However, the IC chip 4 is connected to the power feeding units 2a and 2b arranged in parallel. The conductor patterns 2c and 2d for stabilizing the position of the IC chip 4 are positioned between the proximity write antennas 3L and 3R.
FIG. 7 includes a one-wavelength loop antenna 7, and the total length of the folded curve shape is set to be approximately one wavelength in the UHF band. The width L in the horizontal direction is about 88 mm, and the thickness of the antenna line is about 2 mm. Since the loop antenna 7 has a length of one wavelength, the area increases and the label width does not fit in one inch. In the case of FIG. 7, the proximity write only antenna 3 is formed so that the bar-shaped antennas 3L and 3R are parallel to the main body 1 wavelength loop antenna 7 and connected to the junctions (feeding portions) 2a and 2b. In the case of the one-wavelength loop antenna 7, since the total length of the antenna is long, the total length of the proximity write dedicated antenna 3 can be reduced from 1/5 to 1/20 of the total length of the main body antenna.

FIG. 8 is a diagram illustrating a situation where data is written to the IC tag 1. In the state shown in the figure, the reader / writer 10A seems to be placed in the horizontal direction in the same plane as the IC tag 1, but in reality, the positional relationship is such that the antenna surfaces of both the IC tag 1 and the reader / writer 10A are placed facing each other. Is done.
Since the non-contact IC tag 1 is manufactured from a continuous web, the contactless IC tag 1 is actually in a connected state immediately after manufacturing. This is because it is efficient to write to such a connected body, and it is convenient to specify the non-contact IC tag after writing data.

  When performing continuous writing work exclusively at a position close to the IC tag 1, place the low output reader / writer 10 </ b> A at a close position (a distance of 1 to 30 cm) while intermittently sending the IC tag connecting body. Radiation is performed so that the radio wave (C 1) reaches only the write-only antenna 3 of the IC tag 1. A portion other than the dedicated antenna 3 portion of the IC tag 1 to be written may be shielded for writing. Note that the write-only antenna 3 is also capable of reading the data on the IC chip 4 in the sense that it mainly receives data used for writing from the reader / writer 10 and writes it in the memory of the IC chip 4. It is.

  Such writing is mainly performed when an IC tag manufacturer writes a production lot, a product number, or the like, or when a user continuously writes a product name, a product price, quality, or the like at the start of use. The IC tag 1 on which a product name or the like is written is attached to a product or an article and placed in various places. Subsequent reading and writing (read / write) can use a normal UHF band reader / writer 10B, which emits radio waves (C2) and can read and write from a long distance of 3 to 5 meters.

As described above, the frequency band in Japan where UHF band IC tags can be used is 2 MHz from 952 M to 954 MHz for the high output type, and 3 MHz from 952 M to 955 MHz for the low output type. Among the high output type HF band IC tag reader / writers, there is “XR480-JP” of Symbol Technologies as an installation type. These antennas are quite large.
As a low output handy reader / writer, “BHT-230QWID” (952 M to 955 MHz; output 10 mW) will be released soon from Denso Wave Co., Ltd. The reading distance is seen to be about 10 cm. As another low output type UHF band IC tag, a reader / writer of Fujitsu Limited can be used. For example, a CF type reader / writer “TFU-RW526” for accessing the UHF band RFID tag can be used by inserting the Multipad main body “FHT401SS1” into the main body. In this case, the communication distance is about 3 cm to 10 cm.

The non-contact IC tag 1 can be manufactured by the same process as that for manufacturing a conventional non-contact IC tag. As the base film 11, a material obtained by laminating a metal foil (for example, aluminum or copper foil) on the base film surface is used. A photosensitive photoresist is applied to the metal foil surface of the base film 11 and exposed to light using a photomask to form a resist layer. The photomask has patterns of both the dipole antenna 2 and the proximity writing antenna 3. Both antenna patterns may be resist printed.
Next, the metal layer is etched to form a predetermined pattern. After etching, the IC chip 3 is mounted on the dipole antenna 2 of the base film 11 with an anisotropic conductive adhesive film or the like, and then the surface protection sheet 5 is laminated. As the IC chip 3, a UHF band or microwave band compatible IC chip is used. For example, US Impinge “Monza”, US Texas Instruments “UHF-IC-01”, Philips Electronics “UCODE EPCG2”, and the like.

Using a base material obtained by laminating an aluminum foil having a thickness of 12 μm on a polyethylene terephthalate (PET) film having a thickness of 20 μm, the half-wave dipole antenna pattern 2 and the antenna for exclusive use of proximity writing 3 were resist printed and etched. The half-wave dipole antenna pattern 2 has a shape as shown in FIG. 2 and a length of 160 mm.
Further, the proximity writing dedicated antenna 3 has a shape in which the main body half-wave dipole antenna pattern 2 is reduced to a similar shape to about 1/5, and a bar (bar) having a width of 2 mm, a total length (3L + 3R overall length), 20 mm, 25 mm, and 30 mm. ) -Shaped protrusions (4 types for convenience) and orthogonal to the half-wave dipole antenna 2 as shown in FIG. The IC chip 4 was manufactured by Texas Instruments, and was attached to the joint portions (power feeding portions) 2a and 2b using an anisotropic conductive adhesive film. A non-contact IC tag 1 of the present invention was completed by laminating a PET film having a thickness of 12 μm as a surface protective sheet 5 on the antenna surface.

Using a base material obtained by laminating a 12 μm thick aluminum foil on a 20 μm thick polyethylene terephthalate (PET) film, the dipole antenna pattern 2 having the radiation portions Lm and Rm and the proximity writing dedicated antenna 3 were formed by photoetching. .
The dipole antenna 2 is shaped as shown in FIG. 4 so that the total length L is 88 mm. The radiating portions Lm and Rm each have a size of 20 mm × 22 mm. The proximity writing antenna 3 is a rod-shaped protrusion (two types) having a width of 1.0 mm, an overall length (total length of 3L + 3R), 10 mm, and 15 mm so as to be parallel to the dipole antenna 2 as shown in FIG. The IC chip 4 was manufactured by Texas Instruments, and was attached to the joint portions (power feeding portions) 2a and 2b using an anisotropic conductive adhesive film.
A non-contact IC tag 1 of the present invention was completed by laminating a PET film having a thickness of 12 μm as a surface protective sheet 5 on the antenna surface.

  Proximity writing from a distance of 5 cm by a UHF band (952 to 954 MHz) reader / writer to the completed connection body of non-contact IC tag 1 of Example 1 and Example 2 (IC tag pitch 35 mm) (Fujitsu) "FHT401SS1" manufactured by Co., Ltd. was used, and any IC tag could be written without error. In addition, any non-contact IC tag 1 cut into units could be remotely read / written from a distance of 3 meters (using “XR480-JP” manufactured by Symbol Technologies).

The non-contact IC tag of the present invention is based on the premise that the proximity write dedicated antenna 3 and the normal dipole antenna 2 or the one-wavelength loop antenna 7 transmit and receive a radio wave of a common frequency as described above. May be different. In that case, however, reader / writers having different frequencies are used, and the IC chip 4 also has a circuit for modulating / demodulating radio waves of both frequencies, so that it is possible to write to the memory by the same control.
The present invention is considered to be applicable not only to a dipole antenna and a one-wavelength loop antenna but also to a half-wavelength folded dipole antenna.

It is a top view which shows the 1st form of the non-contact IC tag of this invention. It is a top view which shows the other example of a 1st form. It is the sectional view on the AA line of FIG. It is a top view which shows a 2nd form. It is a top view which shows the other example of a 2nd form. It is a top view which shows a 3rd form. It is a top view which shows a 4th form. It is a figure which shows the condition written in an IC tag. It is a figure explaining the writing method of the conventional UHF band IC tag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Non-contact IC tag 2 Dipole antenna, antenna 3 Proximity writing antenna 4 IC chip 5 Surface protection sheet 6 Adhesive layer 7 1 wavelength loop antenna 8 Impedance matching circuit 10A, 10B, 10C Reader / writer 11 Base film Lm, Rm Radiation part

Claims (7)

In a UHF band or microwave band non-contact IC tag having a half-wave dipole antenna on the base film surface and mounting an IC chip between the left and right quarter-wave antennas, connected to the same pad of the IC chip. A small proximity writing dedicated antenna having an overall length of 1/3 to 1/10 of the total length of the half-wave dipole antenna was formed on the same surface of the base film so as to be parallel or orthogonal to the half-wave dipole antenna. A non-contact IC tag characterized by the above. In a UHF band or microwave band non-contact IC tag having a dipole antenna having a radiating portion at both ends on the base film surface and mounting an IC chip between the left and right dipole antennas, the same pad of the IC chip is used. A small proximity write dedicated antenna having a total length of 2/3 to 1/10 of the total length of the dipole antenna to be connected is formed on the same surface of the base film so as to be parallel or orthogonal to the dipole antenna. Non-contact IC tag characterized by. Connected to the same pad of the IC chip in a UHF band or microwave band non-contact IC tag having a curved dipole antenna on the base film surface and mounting an IC chip between the left and right dipole antennas A small bar-shaped proximity writing dedicated antenna having an overall length of 2/3 to 1/10 of the total length of the dipole antenna is placed on the same surface of the base film and between the bars on the feeding portion of the dipole antenna. A non-contact IC tag , wherein the angle α is 45 ° to 180 ° . The UHF band or microwave band non-contact IC tag having a one-wavelength loop antenna on the base film surface and having an IC chip mounted between the antennas, connected to the same pad of the IC chip. A small bar-shaped proximity write-only antenna having an overall length of 1/5 to 1/20 of the total length was formed on the same surface of the base film so as to be parallel to the feeding portion of the one-wavelength loop antenna. A non-contact IC tag characterized by the above. 3. The non-contact IC tag according to claim 1, wherein the small dedicated write antenna has a shape obtained by reducing a dipole antenna for a non-contact IC tag into a substantially similar shape. The non-contact IC tag according to claim 1 or 2, wherein the small proximity write-only antenna has a straight bar shape. A claim 1 or encoding method of any UHF band or microwave band non-contact IC tag according to claim 4, the proximity of one of the non-contact IC tag in the connecting state of the connecting member of the non-contact IC tag An encoding method for a non-contact IC tag, wherein a reader / writer with a communication distance of 3 to 10 cm is used to radiate and encode a radio wave at a position close to 1 to 5 cm with respect to a write-only antenna .