WO2015063822A1

WO2015063822A1 - Method for attaching rfid tag to tree

Info

Publication number: WO2015063822A1
Application number: PCT/JP2013/079078
Authority: WO
Inventors: 繁山内; 貴章由井
Original assignee: 株式会社日立システムズ
Priority date: 2013-10-28
Filing date: 2013-10-28
Publication date: 2015-05-07

Abstract

A method for attaching an RFID tag to a tree reduces the effects of water and moisture and makes obtaining sufficient communications sensitivity possible, damaging and affecting the tree and the like as little as possible when an RFID tag is attached inside a tree or the like. A representative embodiment has a step for forming a wedge shaped hole oriented in the direction of the center of the tree from the surface of the tree and a step for inserting the RFID tag in the wedge shaped hole such that a surface formed by a coil antenna of the RFID tag is orthogonal to the surface of the tree in a position in the wedge shaped hole.

Description

Attaching RFID tags to trees

The present invention relates to a tree management technique, and in particular, to a technique effective when applied to an RFID tag mounting method for solid-state management of a tree.

Even if it is a tree, for example, if it has a high value (price), such as a seedling such as a cherry tree or a high-class bonsai, or if it is necessary to manage the state individually, such as a roadside tree, realization of authenticity judgment and management・ In some cases, it is desired to perform solid recognition for efficiency.

When a tree or the like is to be solid-recognized, as a general technique, for example, a tag or the like on which identification information is written is attached to the tree. In addition, RFID (Radio Frequency IDentification) tags are incorporated into such tags, and identification information and attribute information are held as electronic data, so that more efficient and effective solid management is performed. Yes.

However, when attaching an identification sign such as a tag to the outside of a tree or the like, it is easy to drop off or replace with the growth or transportation of the tree, and it may be difficult to guarantee the accuracy of solid recognition. It can occur easily. Moreover, in a bonsai etc., aesthetics are important, and it may happen that the aesthetics are impaired by attaching an identification mark such as a bill.

Therefore, it has been studied to perform solid recognition by attaching an RFID tag to a tree or the like itself. As a technique related to this, for example, in Japanese Patent Application Laid-Open No. 2012-24034 (Patent Document 1), as a method of embedding an RFID tag in a tree, a method of opening a hole in a tree and embedding the RFID tag in the hole, More preferably, a method of inserting and embedding an RFID tag so as to make a part of the bark into a semi-peeled state by cutting into the bark and being sandwiched between the trunk and the bark in the semi-peeled state, A method of peeling a part of the bark and fixing the RFID tag between the peeled bark and the tree by a fixing means such as vinyl tape is described.

JP 2012-24034 A

In the prior art, as a suitable method for attaching an RFID tag to a tree or the like, a method in which a part of the bark is partially peeled or peeled off, and an RFID tag is inserted or embedded between the peeled bark and the tree or fixed. Are listed. However, exfoliating the bark increases the area that damages the tree and tends to induce disease due to invasion of germs. Moreover, when the tissue of the exfoliation part adheres and heals, the tissue of the part enlarges and rises, and the aesthetic sense is easily lost.

In addition, in the prior art, as a type of the RFID tag, one that uses radio waves in an HF (High-Frequency) band is more suitable because of its high resistance to moisture and metal. However, when the HF band is used, as will be described later, since a close electromagnetic wave (inductive electromagnetic wave) is used for communication between the reader / writer device and the RFID tag, the reader / writer device is considerably close to the RFID tag (tree). You can't communicate without it.

Even when a UHF (Ultra High Frequency) band is used for communication between the reader / writer device and the RFID tag, the method of inserting the RFID tag between the peeled bark and the tree is usually as described later. Since the surface formed by the antenna of the RFID tag faces the reader / writer device, there is a problem that the sensitivity is greatly reduced for a radiated radio wave having a weak output used for communication in the UHF band. .

Therefore, the object of the present invention is to reduce the influence of water and moisture when mounting an RFID tag inside a tree or the like, and to obtain sufficient communication sensitivity without damaging the tree or the like as much as possible. It is to provide a method of attaching an RFID tag to a tree.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.

A method of attaching an RFID tag to a tree according to a representative embodiment of the present invention is a method of attaching an RFID tag by embedding an RFID tag inside a tree, wherein the wedge is directed from the surface of the tree toward the center of the tree. A step of forming a hole, and a step of inserting the RFID tag into the wedge-shaped hole in a state where a surface formed by a coil antenna of the RFID tag is orthogonal to the surface of the tree at the position of the wedge-shaped hole; It is what has.

Among the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.

That is, according to a typical embodiment of the present invention, when mounting an RFID tag inside a tree or the like, it is possible to reduce the influence of water and moisture, and to prevent damage and influence on the tree as much as possible. Communication sensitivity can be obtained.

(A), (b) is the figure which showed the outline | summary about the example of the mounting method of the RFID tag to the tree which is one embodiment of this invention. It is a figure explaining an outline | summary about the example of the operation | movement principle of communication between the RFID tag and reader / writer apparatus in one embodiment of this invention. It is a figure explaining an outline | summary about the example of the operation | movement principle of communication between the RFID tag of the "vertical installation" state and reader / writer apparatus in one embodiment of this invention. It is the figure which showed the outline | summary of the result of having performed reading experiment about the RFID tag with which the method of one embodiment of this invention was mounted | worn with the tree etc. It is the figure which showed the outline | summary about the example in the case of coating the RFID tag in one embodiment of this invention with resin etc. FIG. (A), (b) is the figure which showed the outline | summary about the example of the mounting method of the RFID tag to the tree in a prior art. (A), (b) is a figure explaining an outline | summary about the example of the operation | movement principle of communication between the RFID tag and reader / writer apparatus of a "flat placement" state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted. In the following, in order to make the features of the present invention easier to understand, the description will be made in comparison with the prior art.

FIG. 6 is a diagram showing an outline of an example of a method for attaching an RFID tag to a tree in the prior art. FIG. 6A shows an example of the process of peeling the bark to attach the RFID tag. As described above, in the prior art, as a suitable method for embedding and mounting the RFID tag in the tree 10, for example, the trunk bark 11 is cut with a tool 21 such as a knife so that a part thereof is in a semi-peeled state. That is, the bark 11 is not cut off, but is peeled in a state in which at least a part is connected to the tree 10 so that the bark 11 is naturally healed over time.

After that, as shown in FIG. 6B, a flat RFID tag 30 is inserted so as to be sandwiched between the xylem 12 and the semi-peeled bark 11, and the semi-peeled bark is inserted. 11 is embedded so as to cover the RFID tag 30. That is, the flat RFID tag 30 is embedded in the portion of the tree part 12 from which the bark 11 has been peeled off. In this case, when assuming that the shape of the trunk of the tree 10 is approximately cylindrical, the flat RFID tag 30 is mounted in a positional relationship so as to be substantially in contact with the outer periphery of the side surface. Become. Hereinafter, the mounting in such a state may be referred to as “flat placement”.

In the method of peeling the bark 11 as shown in the example of FIG. 6, the bark 11 having a certain area is peeled off so that the RFID tag 30 can be attached to the peeled portion by “flat placement”. Become. As a result, various germs and the like easily invade from the peeled portion, and the disease is easily induced. Moreover, when the tissue of the exfoliation part adheres and heals, the tissue of the part enlarges and rises, and the aesthetic sense is easily lost. In the worst case, there is also a high risk that the RFID tag 30 may fall off because the tissue does not adhere and is necrotized.

Further, the inner part of the bark 11 has a vascular bundle forming layer (not shown) (hereinafter sometimes simply referred to as “formed layer”), and the tissue of this part grows and grows in the growth process of the tree 10. . Therefore, in order to appropriately embed the RFID tag 30 by adhesion of the bark 11 accompanying growth, it is necessary to include the formation layer in the peeled bark 11 and embed the RFID tag 30 inside thereof. However, when the peeled bark 11 does not include the formation layer and the RFID tag 30 is embedded outside the formation layer due to a mistake during the peeling, the RFID tag 30 is attached to the tree 10 as the formation layer grows thereafter. There is also a risk that it will be pushed out of the trunk and fall off.

Therefore, in the method for attaching an RFID tag to a tree according to an embodiment of the present invention, when the RFID tag 30 is embedded in the tree 10 and attached, the bark 11 is peeled off and “flatly placed”. Rather, a wedge-shaped hole having a size sufficient to embed the RFID tag 30 from the bark 11 toward the center of the tree 10 is formed, and the RFID tag 30 is embedded or pushed into the hole. That is, assuming that the shape of the trunk of the tree 10 is approximately cylindrical, the flat RFID tag 30 is mounted in a positional relationship so as to be substantially orthogonal to the outer periphery of the side surface. Hereinafter, the mounting in such a state may be referred to as “vertical placement”.

FIG. 1 is a diagram showing an outline of an example of a method for attaching an RFID tag to a tree according to an embodiment of the present invention. FIG. 1A shows an example of a process of making a wedge-shaped hole for mounting an RFID tag. Here, for example, the wedge-shaped hole 13 is formed by inserting a tool 20 having a wedge-shaped tip such as a screwdriver or a chisel from the bark 11 into the trunk of the tree 10. Thereafter, as shown in FIG. 1B, the RFID tag 30 can be mounted “vertically” by inserting the RFID tag 30 into the wedge-shaped hole 13.

In order to enable such mounting, the wedge-shaped hole 13 needs to have a size that can accommodate the RFID tag 30 in a “vertical position”. In order to make the size of the wedge-shaped hole 13 as small as possible, the RFID tag 30 is desirably a small one, for example, a size of about 5 mm square and a thickness of about 1 mm or less. In addition, the size of the wedge-shaped hole 13 is desirably a size with a margin of about 1 mm to 3 mm or less from each surface of the RFID tag 30 to be inserted.

In this embodiment, as shown in FIG. 1B, an ultra-small RFID tag 30 (for example, IM5-PK2525 type (2.5 mm square, thickness of Hitachi Chemical Co., Ltd.) that can be generally purchased in the market. 0.4 mm)). In this case, as shown in FIG. 1A, the wedge-shaped hole 13 has a depth of about 4 to 5 mm and an opening of about 4 mm in length and about 2 mm in width, as shown in FIG. The RFID tag 30 can be inserted by “vertical placement”. As long as it has a thickness capable of forming the wedge-shaped hole 13 having such a size, it can be mounted not only on the trunk of the tree 10 but also on a branch or a root portion.

As described above, in the present embodiment, the RFID tag 30 can be embedded and attached only by scratching a part of an extremely small area of the bark 11, and damage to the tree 10 can be minimized. . In addition, the space of the gap after inserting the RFID tag 30 in the wedge-shaped hole 13 may be left as it is, so that the formation layer of the bark 11 grows so that the hole is naturally filled, or an adhesive or It may be filled by injecting resin or the like.

In this embodiment, an ultra-small RFID tag 30 having an IC chip 31 and a coil antenna 32 as shown in FIG. 1B is used. However, other RFID tags having a coil antenna structure are used. There may be. “Vertical placement” of the RFID tag 30 means that the surface formed by the coil antenna 32 is placed in a “vertical placement” state.

FIG. 2 is a diagram for explaining an outline of an example of an operation principle of communication between the RFID tag and the reader / writer device in the present embodiment. Two principles can be inferred as the principle of establishing communication between the RFID tag 30 embedded in the tree 10 and the reader / writer device 40.

One is that the radiated radio wave 41 from the reader / writer device 40 acts on a conductor of ions inside the tree 10 to cause a high frequency current 42 to flow, and this high frequency current 42 excites an induced current in the coil antenna 32 of the RFID tag 30. Thus, it is assumed that the RFID tag 30 operates and can communicate. The other one is speculation that the radio wave 41 from the reader / writer device 40 communicates by directly exciting the RFID tag 30 while receiving a wavelength shortening inside the tree 10. Regardless of the operating principle, the RFID tag 30 can operate when it is “vertically placed” inside the tree 10.

The tree 10 is a living plant, and it is considered that wavelength shortening due to the dielectric constant of the internal moisture has a great influence on communication. On the other hand, for example, in the heating in the microwave oven, the inside of the tree 10 can be cooked by electromagnetic waves in the same manner as the inside of the plant. Therefore, the latter effect becomes more obvious inside the tree 10 among the above assumptions. it is conceivable that.

Therefore, it is considered that some electromagnetic waves enter the inside of the tree 10, and the RFID tag 30 has a coil antenna 32, so that it operates as a magnetic field. In order to efficiently attract a magnetic field (line of magnetic force) that enters the tree 10 from the air to the coil antenna 32, the RFID tag 30 is parallel to the traveling direction of the radiated radio wave 41 output from the reader / writer device 40. In other words, it is desirable that the tree 10 be mounted in a “vertically placed” state rather than “flatly placed”.

As described above, since the wavelength is shortened by the dielectric constant of moisture inside the tree 10, the resonance frequency of the coil antenna 32 of the RFID tag 30 is adjusted in consideration of this, thereby enabling communication. The sensitivity can be further improved. As shown in the figure, when the wavelength of the radiated radio wave 41 in the air is λ and the shortened wavelength inside the tree 10 is λ _p ,
λ _p = λ / √ (relative permittivity inside the tree)
It becomes. Here, since the relative dielectric constant of water is 80, the wavelength is shortened to about 1/9 in the portion where the moisture is high. On the other hand, the relative permittivity of dry wood or the like may be about 2, and in this case, the reduction is only about 1 / 1.4.

FIG. 3 is a diagram for explaining an outline of an example of an operation principle of communication between the RFID tag in the “vertical placement” state and the reader / writer device. Regarding the electromagnetic field of the radiated radio wave 41 output from the reader / writer device 40, the electric field is omitted in the figure and only the magnetic field is indicated by magnetic lines of force, but the magnetic line of force reverses the phase along the traveling direction of the radiated radio wave 41. The generated loop is generated continuously. This is electromagnetically coupled by generating an induced current 33 in a coil antenna 32 (not shown) of the RFID tag 30. In order to effectively capture the loop-shaped magnetic field lines, the RFID tag 30 (coil antenna 32) is desirably “vertically placed” as illustrated.

FIG. 7 is a diagram for explaining an outline of an example of an operation principle of communication between an RFID tag in a “flat” state and a reader / writer device. In FIG. 7A, unlike the example of FIG. 3, the RFID tag 30 is “flatly placed”. In this case, assuming that the angle formed by the direction 44 of the surface of the coil antenna 32 of the RFID tag 30 and the traveling direction 45 of the radio wave is θ, the coil antenna 32 (not shown) is opposite to each other (θ = 90 ° and in phase). The induced current 33 is about to flow. As a result, these induced currents 33 cancel each other on the coil antenna 32, and as a result of no current difference being generated, it becomes difficult for the current to flow, so the communication sensitivity is greatly reduced.

In order to effectively communicate with the RFID tag 30 in the “flat” state, as shown in FIG. 7B, the reader / writer device 40 is brought close to the RFID tag 30 and is not shown by the proximity radio wave 43. The induction current 33 is generated in the coil antenna 32 by mutual induction.

In this case, a difference is likely to occur in the in-phase induced current 33 generated in the coil antenna 32 because the proximity radio wave 43 has a wide finite size, θ shifts from 90 °, and the like. As a result, a differential current flows on the coil antenna 32, and the RFID tag 30 can communicate. However, in this case, since the proximity radio wave 43 is used, the intensity becomes weaker in inverse proportion to the square to the third power of the distance, as is well known in electromagnetics. In other words, there is a restriction that it must be close to the tree 10).

When the radiated radio wave 41 is used as shown in the example of FIG. 3 instead of the proximity radio wave 43, the intensity becomes weaker in inverse proportion to the first power of the distance, as is well known in electromagnetics. The degree of attenuation is less than that of the proximity radio wave 43. In the UHF band, the half-wavelength (diameter per loop) of the magnetic field lines is about 16 cm, and communication is possible even with attenuation if the distance is in this order. On the other hand, in the HF band radiated radio wave 41, the half wavelength of the magnetic field lines is as long as about 11 m, and the output is attenuated to such an extent that communication is impossible at this order distance. Therefore, in order to communicate with the RFID tag 30 by the reader / writer device 40 at an effective distance using the radiated radio wave 41, it is desirable to use the UHF band. In this embodiment, the UHF band is used.

As described above, when the RFID tag 30 is embedded and attached to the inside of the tree 10, the influence of moisture contained in the tree 10 may be a problem. Therefore, from the reader / writer device 40, it is determined whether the RFID tag 30 can be actually embedded and attached by using the method of the present embodiment and read by the reader / writer device 40 for several types of plants having different moisture contents. The readable distance (flying distance sensitivity) was measured for each radio wave output. Note that a plurality of types of radio wave output values are measured because the RFID tag 30 embedded in the tree is positioned relatively inside the tree surface as the tree grows, and the reader / writer device 40 This is for ascertaining whether or not there is an influence when the distance from the RFID tag 30 to the RFID tag 30 increases.

FIG. 4 is a diagram showing an outline of a result of a reading experiment performed on an RFID tag attached to a tree or the like by the method of the present embodiment. In the figure, the measurement results of the flight distance sensitivity (communication possible distance) for each radio wave output are shown for each characteristic of the water content of the sample (plant such as a tree). In the experiment, for comparison, the RFID tag 30 attached by the conventional attachment method (“flat placement”) is also measured for the attachment method of the present embodiment (“vertical placement”). And show the results.

As samples with different moisture content characteristics: 1. Sample with relatively little moisture; 2. Sample of general moisture content 3. Sample with relatively high moisture content 4. almost moisture sample, Measurement was performed using five types of samples, samples having a relatively high oil content. Specific attribute information of each sample is as follows.

1. Sample with relatively little moisture Persimmon log (3 days after cutting), 30 years old, 9 cm thick, 30 cm long
2. Sample of general moisture content Weeping cherry tree, 16 years old, RFID tag mounting position is 110cm above ground
3. Sample with relatively high moisture Tree-planted tree, 40 years old, 7.3cm thick, RFID tag is 50cm above ground
4). Almost moisture sample Radish, 6.5cm in thickness, 42cm in length, RFID tag is attached at the center. Sample with relatively high oil content Kuromatsu Bonsai, 60 years old, 3.6 cm thick, RFID tag is 28 cm above ground

In the experimental results shown in FIG. 1. Sample with relatively little moisture; 4. a sample of general moisture content, and The three types of samples having a relatively high oil content can be read only at a very close distance of 1 cm or less when mounted in a “flat” state. On the other hand, when installed in the “vertical position” state, reading is possible up to a distance of several centimeters to several tens of centimeters, and “vertical position” is overwhelming in terms of communication effectiveness. It turns out to be advantageous.

On the other hand, 3. 3. a relatively wet sample, and Two types of samples, almost moisture samples, can be read only at a very close distance of 1 cm or less when mounted in a “flat” state, but the radio wave output is reduced to about 24 dBm. Has a characteristic that it can be read relatively continuously. On the other hand, when mounted in the “vertical position” state, a radio wave output of about 30 dBm can be read up to a distance of a few centimeters, but if the radio wave output is lowered, the flight distance sensitivity becomes unreadable. It has a tendency to fall sharply.

This is because, since the sample has a lot of moisture, the radiated radio wave is subjected to wavelength shortening inside the sample due to the high dielectric constant of water, and the tuning of the coil antenna 32 of the RFID tag 30 embedded in the sample is shifted. It is presumed that the sensitivity has decreased significantly.

Therefore, in the present embodiment, a measure is taken to coat the RFID tag 30 by covering it with a low dielectric constant resin or the like so that the coil antenna 32 of the RFID tag 30 is not directly exposed to a medium having a high dielectric constant. FIG. 5 is a diagram showing an outline of an example in which an RFID tag is coated with resin or the like. As shown in the figure, for example, the entire surface of the RFID tag 30 is coated with a waterproof resin with a thickness of about 0.5 mm to obtain a processed RFID tag 30a. In consideration of the ease of embedding in the tree 10 by the method of the present embodiment illustrated in FIG. 1, it is desirable that the coating is about 1 mm or less even if it is thick so as to be as small as possible.

In the above experiment, two types of RFID tags 30a, “Countermeasure 1” with a coating thickness of 0.5 mm and “Countermeasure 2” with a coating thickness of 1.0 mm, are separately prepared and subjected to the same measurement. (3. Only “Countermeasure 2” was implemented for samples with relatively high water content). FIG. 4 also shows this measurement result. According to this, it is clear that by taking the above-mentioned countermeasure against moisture, the flight distance sensitivity is greatly improved with respect to simple “vertical placement”. It has also been shown that flight distance sensitivity can be maintained to some extent against a decrease in radio wave output.

Therefore, for example, the above-mentioned countermeasure is based on the radio wave inside the tree 10 when the distance between the RFID tag 30 and the bark 11 becomes large, for example, the RFID tag 30 is left in the vicinity of the center of the trunk as the tree 10 grows. It has the effect that the influence of attenuation can be reduced and the influence caused by the change in the water content of the tree 10 can also be reduced. Naturally, the application of the waterproof coating also has the effect of reducing failure due to the protection of the internal RFID tag 30.

Even if the above measures are taken, if the RFID tag 30 is left near the center of the trunk as the tree 10 grows, the RFID tag 30 cannot be read from the outside of the tree 10 in the future. It is also assumed that In such a case, it is possible to cope with the operation by, for example, newly embedding and mounting the RFID tag 30 for update. The operation method is, for example, when the RFID tag 30 fails and communication is impossible, or the life of the tree 10 is longer than the useful life of the RFID tag 30 (for example, the useful life of the RFID tag 30 is several tens of years). On the other hand, the present invention can be applied to a case where the life of the tree 10 is several hundred years).

Further, in the present embodiment, the target in which the RFID tag 30 is embedded is described as the woody tree 10, but it is the dielectric that is involved in the radio wave, and the type of plant is not directly related. Therefore, for example, it can also be applied to non-woody plants such as foliage plants such as cycads, cactuses, flower buds, and vegetables. Further, not only plants that are planted and alive, but also those that have withered or felled wood can be managed solidly if the mounted RFID tag 30 is normal.

As described above, according to the method for attaching an RFID tag to a tree, which is an embodiment of the present invention, the RFID tag 30 is embedded in the tree 10 by “vertical placement” and attached to the tree bark. The damage in that the tree 10 is scratched can be reduced as compared with the case where 11 is peeled off. In addition, the effectiveness of communication with the reader / writer device 40 can be greatly improved as compared with the case of mounting by “flat placement”. Furthermore, the effectiveness of communication can be further improved by applying a waterproof coating to the RFID tag 30.

In addition, since solid management can be performed accurately by embedding the RFID tag 30 in the tree 10 or the like, for example, growth management, annual ring count management, insecticide treatment history management, epidemics management, and the like are accurately performed. Is possible. In addition, for example, it is possible to manage the production area information of plants that are difficult to grow on seeds, such as seedless grapes, seedless loquats, and seedless sweet potatoes, and to enhance traceability. In addition, it is possible to accurately manage rootstocks and spikelets in grafting, endangered species management, import / export management, and bonsai solid management.

As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the configurations described. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of the above-described embodiment.

The present invention can be used for an RFID tag mounting method for solid-state management of trees.

10 ... tree, 11 ... bark, 12 ... xylem, 13 ... wedge,
20, 21 ... Tool,
30, 30a ... RFID tag, 31 ... IC chip, 32 ... coil antenna, 33 ... induced current,
DESCRIPTION OF SYMBOLS 40 ... Reader / writer apparatus, 41 ... Radiated radio wave, 42 ... High frequency current, 43 ... Proximity radio wave, 44 ... Direction of surface formed by

coil antenna

32, 45 ... Direction of radio wave traveling.

Claims

A method of attaching an RFID tag to a tree, in which an RFID tag is embedded and attached to a tree,
Forming a wedge-shaped hole from the surface of the tree toward the center of the tree;
Inserting the RFID tag into the wedge-shaped hole in a state in which the surface formed by the coil antenna of the RFID tag is orthogonal to the surface of the tree at the position of the wedge-shaped hole. How to wear.
In the mounting method of the RFID tag to the tree of Claim 1,
The RFID tag is a method for attaching an RFID tag to a tree, wherein the RFID tag performs communication using a UHF band.
In the mounting method of the RFID tag to the tree of Claim 1,
The RFID tag has a size of 5 mm square and a thickness of 1 mm or less, and the RFID tag is attached to a tree.
In the mounting method of the RFID tag to the tree of Claim 3,
The wedge-shaped hole has a size such that the distance between the inner surface of the wedge-shaped hole and each surface of the RFID tag inserted into the wedge-shaped hole is 3 mm or less, respectively. How to attach the tag.
In the mounting method of the RFID tag to the tree of Claim 1,
The RFID tag is a method for attaching an RFID tag to a tree, wherein each surface has a coating made of waterproof resin.
In the mounting method of the RFID tag to the tree of Claim 5,
The method for mounting an RFID tag on a tree, wherein the thickness of the coating on each surface of the RFID tag is 1 mm or less.