JP7077760B2

JP7077760B2 - RF tag structure

Info

Publication number: JP7077760B2
Application number: JP2018094563A
Authority: JP
Inventors: 哲治緒方
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 2018-05-16
Filing date: 2018-05-16
Publication date: 2022-05-31
Anticipated expiration: 2038-05-16
Also published as: JP2019201318A

Description

本発明は，無線による個体識別で用いるＲＦタグ（Radio Frequency）に関し，更に詳しくは，電子部品を実装するプリント基板（PCB: printed circuit board）など，比誘電率の高い電気物性を有する板状の物に適したＲＦタグに関する。 The present invention relates to an RF tag (Radio Frequency) used for individual identification by radio, and more specifically, a plate-like material having a high relative permittivity, such as a printed circuit board (PCB) on which an electronic component is mounted. Regarding RF tags suitable for things.

無線による個体識別で用いるＲＦタグラベルが，ＲＦタグラベルを貼付する貼付面の電気物性に適していないと，ＲＦタグラベルの通信性能が著しく悪化することがある。例えば，金属対応を図っていないＲＦタグラベルを金属面に貼付すると，金属面に貼付したＲＦタグラベルの通信性能は著しく悪化する。特許文献１で開示されている発明では，金属対応を図ったＲＦタグラベルとして，放射素子とマッチング回路からなるアンテナをＲＦタグラベルに実装し，放射素子が金属面と電気的に導通することで，ＲＦタグラベルを貼付した金属面をＲＦタグラベルのアンテナの一部として利用できるようにしている。 If the RF tag label used for wireless individual identification is not suitable for the electrical characteristics of the surface to which the RF tag label is attached, the communication performance of the RF tag label may be significantly deteriorated. For example, if an RF tag label that is not compatible with metal is attached to a metal surface, the communication performance of the RF tag label attached to the metal surface is significantly deteriorated. In the invention disclosed in Patent Document 1, as an RF tag label for metal correspondence, an antenna consisting of a radiating element and a matching circuit is mounted on the RF tag label, and the radiating element is electrically conducted with a metal surface to perform RF. The metal surface with the tag label attached can be used as a part of the antenna of the RF tag label.

特開２０１２－１０４９８５号公報Japanese Unexamined Patent Publication No. 2012-104985

ＲＦタグラベルを貼付する貼付面の電気物性にＲＦタグラベルが適していないと，ＲＦタグラベルの通信性能が著しく悪化するケースとして，誘電体の性質を有する貼付面にＲＦタグラベルを貼付するケースがある。 If the RF tag label is not suitable for the electrical properties of the sticking surface to which the RF tag label is affixed, the communication performance of the RF tag label may be significantly deteriorated in the case where the RF tag label is affixed to the sticking surface having a dielectric property.

そこで，本発明は，誘電体に貼り付けたＲＦタグラベルの通信性能が著しく悪化しないように構成したＲＦタグ構造体，および，このＲＦタグ構造体で用いるＲＦタグラベルを提供することを目的とする。 Therefore, an object of the present invention is to provide an RF tag structure configured so that the communication performance of the RF tag label attached to the dielectric is not significantly deteriorated, and an RF tag label used in this RF tag structure.

上述した課題を解決する第１発明は，ＩＣチップを接続させたループ状素子と，導波線路を利用して前記ループ状素子と接続している面状の結合素子を有する構造のアンテナを実装したＲＦタグラベルと，比誘電率の高い材料が用いられた誘電体板を備え，前記ループ状素子の全てと前記導波線路の少なくとも一部が前記誘電体板の端から突設し，前記結合素子の全てが前記誘電体板と重なる状態で，前記ＲＦタグラベルが前記誘電体板に貼られており，前記誘電体板を伝搬する電波の波長は，前記誘電体板が有する波長短縮効果により元の波長よりも短くなることを考慮して，前記ＲＦタグラベルに実装する前記アンテナに係る縦の長さを表１に従うように設計し，更に，前記ＲＦタグラベルの横の長さで，前記ＲＦタグラベルの共振周波数をＵＨＦ帯の周波数帯に調整できるように，前記ＲＦタグラベルに実装する前記アンテナに係る横の長さを，共振周波数が表３に従うように表２に従い設計したことを特徴とするＲＦタグ構造体である。

The first invention for solving the above-mentioned problems mounts an antenna having a structure having a loop-shaped element to which an IC chip is connected and a planar coupling element connected to the loop-shaped element by using a dielectric line. The RF tag label and the dielectric plate made of a material having a high specific dielectric constant are provided, and all of the loop-shaped elements and at least a part of the waveguide project from the end of the dielectric plate, and the coupling is performed. The RF tag label is affixed to the dielectric plate in a state where all of the elements overlap with the dielectric plate, and the wavelength of the radio wave propagating through the dielectric plate is originally due to the wavelength shortening effect of the dielectric plate. In consideration of the fact that the antenna is shorter than the wavelength of the RF tag label, the vertical length of the antenna mounted on the RF tag label is designed to follow Table 1, and the horizontal length of the RF tag label is the RF tag label. RF characterized in that the lateral length of the antenna mounted on the RF tag label was designed according to Table 2 so that the resonance frequency follows Table 3 so that the resonance frequency of the UHF band can be adjusted to the frequency band of the UHF band. It is a tag structure.

第１発明に係るＲＦタグ構造体が備えるＲＦタグラベルは，誘電体の性質を有する貼付面に適した構造にするために，誘電体が有する波長短縮効果を考慮して設計され，第１発明に係るＲＦタグ構造体においては，ＲＦタグラベルの設計を考慮して，ＲＦタグラベルが誘電体板に貼り付けられている。 The RF tag label included in the RF tag structure according to the first invention is designed in consideration of the wavelength shortening effect of the dielectric in order to make the structure suitable for the sticking surface having the property of the dielectric, and is described in the first invention. In the RF tag structure, the RF tag label is attached to the dielectric plate in consideration of the design of the RF tag label.

本実施形態に係るＲＦタグ構造体を説明する図。The figure explaining the RF tag structure which concerns on this embodiment. 本実施形態に係るＲＦタグラベルを説明する図。The figure explaining the RF tag label which concerns on this embodiment. 本実施形態に係るＲＦタグ構造体の一例を説明する図。The figure explaining an example of the RF tag structure which concerns on this embodiment.

ここから，本発明の好適な実施形態を記載する。なお，以下の記載は本発明の技術的範囲を束縛するものでなく，理解を助けるために記述するものである。 From here, suitable embodiments of the present invention will be described. The following description does not constrain the technical scope of the present invention, but is intended to aid understanding.

図１は，本実施形態に係るＲＦタグ構造体１を説明する図である。図１で図示したように，本実施形態に係るＲＦタグ構造体１は，比誘電率の高い材料を用いた板状の部材である誘電体板１２と，ＩＣチップ１１３を接続させたループ状素子１１０と，導波線路１１２を利用してループ状素子１１０と接続している面状の結合素子１１１を有する構造のアンテナ１１を実装したＲＦタグラベル１０を備え，ＲＦタグラベル１０は，ループ状素子１１０の全てと導波線路１１２の少なくとも一部が誘電体板１２の端から突設し，結合素子１１１の全てが誘電体板１２と重なる状態で誘電体板１２に貼られている。 FIG. 1 is a diagram illustrating an RF tag structure 1 according to the present embodiment. As shown in FIG. 1, the RF tag structure 1 according to the present embodiment has a loop shape in which a dielectric plate 12 which is a plate-shaped member using a material having a high specific dielectric constant and an IC chip 113 are connected to each other. The RF tag label 10 is provided with an RF tag label 10 having an element 110 and an antenna 11 having a structure having a planar coupling element 111 connected to the loop element 110 by using a waveguide 112, and the RF tag label 10 is a loop element. All of 110 and at least a part of the waveguide 112 project from the end of the dielectric plate 12, and all of the coupling elements 111 are attached to the dielectric plate 12 in a state of overlapping with the dielectric plate 12.

図２は，本実施形態に係るＲＦタグラベル１０を説明する図で，図２（ａ）は，ＲＦタグラベル１０の層構成を説明する図，図２（ｂ）は，ＲＦタグラベル１０に実装するアンテナ１１を説明する図である。 2A and 2B are diagrams for explaining the RF tag label 10 according to the present embodiment, FIG. 2A is a diagram for explaining the layer structure of the RF tag label 10, and FIG. 2B is an antenna mounted on the RF tag label 10. 11 is a diagram for explaining 11.

ＲＦタグラベル１０を使用する周波数帯はＵＨＦ帯（８６０～９６０ＭＨｚ）で，図２（ａ）で図示したように，ＲＦタグラベル１０は，ＩＣチップ１１３を接続させたアンテナ１１を実装したインレイ１００と，アンテナ１１を実装したインレイ１００の面に積層した第１粘着層１０１と，第１粘着層１０１を保護する剥離紙１０２と，アンテナ１１を実装したインレイ１００の面の裏面に積層した第２粘着層１０３と，第２粘着層１０３を利用してインレイ１００と接着している表面シート１０４から少なくとも構成されている。なお，ＲＦタグラベル１０は，第２粘着層１０３と表面シート１０４を省いた構成にすることもできる。 The frequency band in which the RF tag label 10 is used is the UHF band (860 to 960 MHz), and as shown in FIG. 2A, the RF tag label 10 includes an inlay 100 on which an antenna 11 to which an IC chip 113 is connected is mounted. The first adhesive layer 101 laminated on the surface of the inlay 100 on which the antenna 11 is mounted, the release paper 102 that protects the first adhesive layer 101, and the second adhesive layer laminated on the back surface of the inlay 100 on which the antenna 11 is mounted. It is composed of at least 103 and a surface sheet 104 that is adhered to the inlay 100 by using the second adhesive layer 103. The RF tag label 10 may be configured without the second adhesive layer 103 and the surface sheet 104.

ＲＦタグラベル１０の材料について説明する。インレイ１００のベースフィルムと表面シート１０４には，ポリエチレンテレフタラート（ＰＥＴ），ポリプロピレン（ＰＰ）等の合成樹脂製フィルムに加え，アート紙などを用いることができ，インレイ１００に形成するアンテナ１１にはアルミ箔などの金属箔を利用できる。また，第１粘着層１０１および第２粘着層１０３にはアクリル系やゴム系の粘着剤を利用できる。更に，剥離紙１０２には，シリコーン系などの剥離剤を塗布した合成樹脂製フィルムや剥離剤を塗布した紙を利用できる。なお，結合素子１１１に対応する箇所の剥離紙１２のみを容易に剥がせるようにするための切り込み１０２ａを剥離紙１０２に設けている。 The material of the RF tag label 10 will be described. For the base film and surface sheet 104 of the inlay 100, in addition to synthetic resin films such as polyethylene terephthalate (PET) and polypropylene (PP), art paper or the like can be used, and the antenna 11 formed on the inlay 100 can be used. Metal foil such as aluminum foil can be used. Further, an acrylic or rubber-based adhesive can be used for the first adhesive layer 101 and the second adhesive layer 103. Further, as the release paper 102, a synthetic resin film coated with a release agent such as silicone or paper coated with a release agent can be used. The release paper 102 is provided with a notch 102a so that only the release paper 12 at the portion corresponding to the coupling element 111 can be easily peeled off.

図２（ｂ）を参照しながら，ＲＦタグラベル１０のインレイ１００に実装するアンテナ１１の構造について説明する。インレイ１００に実装するアンテナ１１は，ダイポールアンテナで，ＩＣチップ１１３を接続させたループ状素子１１０および結合素子１１１を有し，導波線路１１２を介してループ状素子１１０が結合素子１１１と接続している構造になっている。 The structure of the antenna 11 mounted on the inlay 100 of the RF tag label 10 will be described with reference to FIG. 2 (b). The antenna 11 mounted on the inlay 100 is a dipole antenna, which has a loop-shaped element 110 and a coupling element 111 to which the IC chip 113 is connected, and the loop-shaped element 110 is connected to the coupling element 111 via a waveguide 112. It has a structure that is.

アンテナ１１を構成するループ状素子１１０は，インレイ１００に実装するＩＣチップ１１３とのインピーダンス整合をとるためのアンテナ素子である。ＩＣチップ１１３の入力端子間には容量性リアクタンス（キャパシタンス）が存在するので，ＩＣチップ１１３と接続するループ状素子１１０の形状をループ形状にし，ＩＣチップ１１３の入力端子間に存在する容量性リアクタンスに対応した誘導性リアクタンス（インダクタンス）をループ状素子１１０に持たせている。 The loop-shaped element 110 constituting the antenna 11 is an antenna element for impedance matching with the IC chip 113 mounted on the inlay 100. Since there is a capacitive reactance (capacitance) between the input terminals of the IC chip 113, the shape of the loop-shaped element 110 connected to the IC chip 113 is made into a loop shape, and the capacitive reactance existing between the input terminals of the IC chip 113. The loop-shaped element 110 is provided with an inductive reactance (inductance) corresponding to the above.

アンテナ１１を構成する結合素子１１１は，ＲＦタグラベル１０を貼付した誘電体板１２と電気的に結合し易いように，プレート電極のような板状の導体で構成されている。結合素子１１１が誘電体と重なるように，ＲＦタグラベル１０を誘電体に貼り付けると，誘電体に放射された電波は，誘電体を伝播し，結合素子１１１を介してＲＦタグラベル１０に伝播され，ＲＦタグラベルが放射する電波は，その逆の経路で誘電体板１２に伝播される。 The coupling element 111 constituting the antenna 11 is composed of a plate-shaped conductor such as a plate electrode so that it can be easily electrically coupled to the dielectric plate 12 to which the RF tag label 10 is attached. When the RF tag label 10 is attached to the dielectric so that the coupling element 111 overlaps with the dielectric, the radio waves radiated to the dielectric propagate through the dielectric and propagate to the RF tag label 10 via the coupling element 111. The radio waves emitted by the RF tag label are propagated to the dielectric plate 12 by the reverse route.

図１で図示したように，ループ状素子１１０の全てと導波線路１１２の少なくとも一部が誘電体板１２から突設し，結合素子１１１の全てが誘電体板１２と重なる状態でＲＦタグラベル１０を誘電体板１２に貼ると，結合素子１１１は，誘電体板１２と電気的に結合する。誘電体板１２を伝搬する電波の波長は，誘電体板１２が有する波長短縮効果により元の波長よりも短くなるので，ＲＦタグラベル１０に実装するアンテナ１１は，縦の長さが表４に従うように設計されている。 As shown in FIG. 1, the RF tag label 10 is in a state where all of the loop element 110 and at least a part of the waveguide 112 project from the dielectric plate 12 and all of the coupling elements 111 overlap with the dielectric plate 12. Is attached to the dielectric plate 12, the coupling element 111 is electrically coupled to the dielectric plate 12. Since the wavelength of the radio wave propagating through the dielectric plate 12 is shorter than the original wavelength due to the wavelength shortening effect of the dielectric plate 12, the antenna 11 mounted on the RF tag label 10 has a vertical length according to Table 4 . Designed for.

更に，ＲＦタグラベル１０を誘電体板１２に貼付すると，誘電体板１２の影響で大きな寄生容量がＲＦタグラベル１０に発生し，ＲＦタグラベル１０の共振周波数が低い方向にシフトしてしまう。ＲＦタグラベル１０の共振周波数を容易に変更可能とするために，線状の導線をジグザグ状に折り曲げたアンテナ素子をループ状素子と接続させることも考えられるが，誘電体板１２から突出する長さが長くなるため，本実施形態では，線状の導線をジグザグ状に折り曲げたアンテナ素子をあえてＲＦタグラベル１０に設けていない。 Further, when the RF tag label 10 is attached to the dielectric plate 12, a large parasitic capacitance is generated on the RF tag label 10 due to the influence of the dielectric plate 12, and the resonance frequency of the RF tag label 10 shifts in a low direction. In order to make it possible to easily change the resonance frequency of the RF tag label 10, it is conceivable to connect an antenna element in which a linear conductor is bent in a zigzag shape to a loop element, but the length protruding from the dielectric plate 12 In this embodiment, the RF tag label 10 is not provided with an antenna element in which a linear conductor is bent in a zigzag shape.

線状の導線をジグザグ状に折り曲げたアンテナ素子を設けていない本実施形態に係るＲＦタグラベル１０では，ＲＦタグラベル１０の横の長さで，ＲＦタグラベル１０の共振周波数を調整できるので，ＲＦタグラベル１０に実装するアンテナ１１は，横の長さが表５に従い，共振周波数が表６に従うように設計されている。 In the RF tag label 10 according to the present embodiment in which the antenna element in which the linear lead wire is bent in a zigzag shape is not provided, the resonance frequency of the RF tag label 10 can be adjusted by the horizontal length of the RF tag label 10, so that the RF tag label 10 can be adjusted. The antenna 11 mounted on the antenna 11 is designed so that the horizontal length follows Table 5 and the resonance frequency follows Table 6 .

本実施形態に係るＲＦタグ構造体１の一例について説明する。本実施形態に係るＲＦタグ構造体１が備える誘電体板１２は，誘電体の性質を有する様々な部材に置き換えることができる。 An example of the RF tag structure 1 according to the present embodiment will be described. The dielectric plate 12 included in the RF tag structure 1 according to the present embodiment can be replaced with various members having the properties of a dielectric.

図３は，本実施形態に係るＲＦタグ構造体１の一例を説明する図である。図３で図示したＲＦタグ構造体１では，本実施形態に係るＲＦタグ構造体１が備える誘電体板１２を，電子部品を実装するＰＣＢ１２ａ（Printed Circuit Board）に置き換えている。図３では，ループ状素子１１０の全てと導波線路１１２の一部がＰＣＢ１２ａから突設し，結合素子１１１の全てがＰＣＢ１２ａと重なるように，誘電体を基材に用いたＰＣＢ１２ａの一辺にＲＦタグラベル１０を貼り付けている。なお，これ以外の例としては，本実施形態に係るＲＦタグ構造体１が備える誘電体板１２をガラス板に置き換える例が考えられる。 FIG. 3 is a diagram illustrating an example of the RF tag structure 1 according to the present embodiment. In the RF tag structure 1 illustrated in FIG. 3, the dielectric plate 12 included in the RF tag structure 1 according to the present embodiment is replaced with a PCB 12a (Printed Circuit Board) on which electronic components are mounted. In FIG. 3, all of the loop-shaped elements 110 and a part of the waveguide 112 project from the PCB 12a, and RF is formed on one side of the PCB 12a using a dielectric material so that all of the coupling elements 111 overlap with the PCB 12a. The tag label 10 is attached. As another example, an example in which the dielectric plate 12 included in the RF tag structure 1 according to the present embodiment is replaced with a glass plate can be considered.

１ＲＦタグ構造体
１０ＲＦタグラベル
１００インレイ
１０１第１粘着層
１０２剥離紙
１０３第２粘着層
１０４表面シート
１１アンテナ
１１０ループ状素子
１１１結合素子
１１２導波線路
１１３ＩＣチップ
１２誘電体板
１２ａＰＣＢ 1 RF tag structure 10 RF tag label 100 Inlay 101 First adhesive layer 102 Release paper 103 Second adhesive layer 104 Surface sheet 11 Antenna 110 Loop-shaped element 111 Coupling element 112 Waveguide line 113 IC chip 12 Dielectric plate 12a PCB

Claims

An RF tag label with a loop-shaped element to which an IC chip is connected and an antenna having a structure having a planar coupling element connected to the loop-shaped element using a waveguide, and a material having a high relative permittivity. Equipped with a dielectric plate in which
The RF tag label is attached to the dielectric plate in a state where all of the loop-shaped elements and at least a part of the waveguide project from the end of the dielectric plate and all of the coupling elements overlap with the dielectric plate. It is affixed to
Considering that the wavelength of the radio wave propagating through the dielectric plate is shorter than the original wavelength due to the wavelength shortening effect of the dielectric plate, the vertical length of the antenna mounted on the RF tag label is set. Designed to comply with Table 1, and laterally to the antenna mounted on the RF tag label so that the resonance frequency of the RF tag label can be adjusted to the UHF band by the lateral length of the RF tag label. The length was designed according to Table 2 so that the resonance frequency follows Table 3.
An RF tag structure characterized by that.