201017550 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種辨識系統標籤，詳言之，係關於一種 具有導電基板之無線射頻辨識（Radio Frequency Identification，RFID)標籤。 【先前技術】 一般習知RFID標籤是直接貼附於商品上，所以在使用 上會遭遇到諸多的問題，而造成系統無法讀取到RFID標籤 中的識別資料，例如：商品重疊、金屬材質包裝之商品、 内容物為液態之商品等。因此，在RFID系統的研發上，需 投入較多人力及研發經費。 因良導體對電磁波而言可視為一完美的反射面，故將 RFID標籤貼附於金屬板的表面時，因良導體邊界條件的限 制，使得靠近金屬面的天線無法有效接收及發射電磁波， 造成系統有效讀取距離由數公尺縮減至1〜2公分以内，甚 至完全失效。此外，一般用於紙箱之RFID標籤都是屬於偶 極式天線結構，所以貼附到金屬物上時，會受到金屬導體 鏡像電流效應的影響而無法作動。 一般紙箱用的天線結構包括：meander antenna、slot antenna 、 folded dipole antenna、inductively coupled dipole spiral antenna等，但這些天線一旦貼設至金屬上便 會完全失效，因此無法使用於金屬物上。 RFID標鐵應用於金屬物品上的解決方式，有兩個基本 策略：（1)設法降低金屬效應的影響程度，例如：加入墊高 133345.doc 201017550 介質 '加入高阻抗表面結構特性之介質；（2)將金屬物視為 天線的一部份進行設計，例如：inverted_F antenna、 in vened-F Patch antenna等天線’其具有一接地面結構， 因此貼附到金屬物時，所受到的影響就相對的比較小。雖 然這些天線可貼附於金屬物上，但其成品厚度、尺寸、成 本及耐用性都不適於量產應用，尤其是以吊掛金屬片標籤 牌的應用更是難以導入實行。201017550 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an identification system tag, and more particularly to a radio frequency identification (RFID) tag having a conductive substrate. [Prior Art] Generally, RFID tags are directly attached to products, so many problems are encountered in use, and the system cannot read the identification data in the RFID tags, for example, product overlap, metal packaging. The products and contents are liquid products. Therefore, in the research and development of RFID systems, more manpower and R&D expenditures are required. Because the good conductor can be regarded as a perfect reflecting surface for electromagnetic waves, when the RFID tag is attached to the surface of the metal plate, the antenna near the metal surface cannot effectively receive and emit electromagnetic waves due to the limitation of the boundary condition of the good conductor. The effective reading distance of the system is reduced from several meters to 1~2 cm, or even completely invalid. In addition, the RFID tags generally used in cartons belong to the dipole antenna structure, so when attached to a metal object, they are affected by the effect of the mirror current of the metal conductor and cannot be activated. The antenna structure for a general carton includes: a meaner antenna, a slot antenna, a folded dipole antenna, an inductively coupled dipole spiral antenna, etc., but these antennas are completely ineffective once attached to the metal, and thus cannot be used on a metal object. There are two basic strategies for the application of RFID standard iron on metal objects: (1) Try to reduce the degree of influence of the metal effect, for example: add the height 133345.doc 201017550 medium 'incorporating medium with high-impedance surface structure characteristics; 2) Designing metal objects as part of the antenna. For example, antennas such as inverted_F antenna and in vened-F Patch antenna have a ground plane structure, so when they are attached to metal objects, the impact is relatively Relatively small. Although these antennas can be attached to metal objects, their finished thickness, size, cost, and durability are not suitable for mass production applications, especially in applications where metal plate labels are suspended.
參考圖1，其顯示美國專利第6,914,562號之無線射頻辨 識系統（RFID)標籤之示意圖。該習知RnD標籤1包括：一 基板11、二導電標籤12、- RFID裝置13及—無線頻率反射 結構⑷該科電標籤12與前觸裝置13設置於該基板u 之-表面’且該RFID裝置13電性連接該等導電標籤12，其 中’該RFID裝置13與該等導電標籤匕之間具有二饋入點 15、16。該無線頻率反射結構14設置於該基板】】之另一表 面。在該習知RFID標籤1中，該無線頻率反射結構Μ係為 一金屬板。Referring to Figure 1, there is shown a schematic diagram of a Radio Frequency Identification System (RFID) tag of U.S. Patent No. 6,914,562. The conventional RnD tag 1 includes: a substrate 11, a second conductive tag 12, an RFID device 13 and a radio frequency reflective structure (4). The electrical tag 12 and the front contact device 13 are disposed on the surface of the substrate u and the RFID The device 13 is electrically connected to the conductive tags 12, wherein the RFID device 13 has two feed points 15, 16 between the conductive tags. The radio frequency reflection structure 14 is disposed on the other surface of the substrate. In the conventional RFID tag 1, the radio frequency reflection structure is a metal plate.
12及該等饋入點 中，該習知RFID 該習知RFID標氬1係藉由該等導電標藏 15、16位置之調整，以改變其阻抗值。其 標籤"系用以設置於不同封裝結構或容器上，但該習知 RFID標戴1之可讀取距離並未改善。 該習知RFID標籤！係適用於金屬待測物之標藏且平設於 待測物之表面。在-般實務上可知…避免該習知刪 標籤i太靠近金屬而降低轄射效率，該基㈣（介電材質）必 須達到-定之厚度，藉以減低該金屬待測物之干擾否則 133345.doc 20101755012 and the feed points, the conventional RFID tag argon 1 is adjusted by the position of the conductive tags 15, 16 to change its impedance value. The label " is used to be placed on different package structures or containers, but the readable distance of the conventional RFID standard 1 has not improved. The conventional RFID tag! It is suitable for the collection of metal analytes and is flat on the surface of the object to be tested. In the general practice, we can know that it is avoided that the label is too close to the metal to reduce the efficiency of the ray. The base (4) (dielectric material) must reach a certain thickness to reduce the interference of the metal analyte. 133345.doc 201017550
Smith Chart圖（複數座標之阻抗數值圖）中之實部阻抗太 小，電磁波無法有效發射。此外，美國專利第6,914,562號 之說明書中亦有明述，在UHF頻段860-950 MHz下，該基 板11之厚度必須厚達3至6公釐，故具有較大之整體厚度及 較南之生產成本（即所需材料較多），且其可讀取距離並未 改善。 因此，有必要提供一創新且富有進步性之具有導電基板 ❹ 之無線射頻辨識標籤’以解決上述問題。 【發明内容】 本發明提供一種具有導電基板之無線射頻辨識標籤，其 包括：一導電基板及一無線射頻辨識裝置。該導電基板具 有一槽孔，該槽孔貫穿該導電基板且具有一設置區段。該 無線射頻辨識裝置具有一無線射頻辨識晶片及二導電帶， 該等導電帶分別設置於該無線射頻辨識晶片之二端，且該 無線射頻辨識晶片及該等導電帶係實質上平行該設置區段 ❹ 設置。 本發明之具有導電基板之無線射頻辨識標籤之結構及生 產流程簡I，故製作容易且製作成本低廉。並且，藉由調 整該槽孔尺寸、形狀，或是調整該RFID裝置之特性，本發 明之具有導電基板之無線射頻辨識標籤具有極佳之幅射效 率，故可增加讀取距離。再者，該導電基板用以支撐及保 護該RFID裝置’因此本發明之具有導電基板之無線射頻辨 識標籤具有極佳之耐用性及較長之使用壽命。 【實施方式】 133345.doc 201017550 參考圖2，其顯示本發明第一實施例具有導電基板之無 線射頻辨識標籤之示意圖。該第一實施具有導電基板之無 線射頻辨識標籤2包括：一導電基板21、一 RFID裝置22及 一結合單元23。該導電基板21具有一槽孔211，該槽孔211 貫穿該導電基板21且具有一設置區段212。該導電基板21 可為金屬基板，其中該導電基板21較佳係為銅材質。 該RFID裝置22具有一 rfID晶片221、二導電帶222及一 ❿ 天線結構223，該等導電帶222分別設置於該RFID晶片221 之二端，且該RFID晶片221及該等導電帶222係實質上平行 該設置區段212設置。其中，該RFm裝置22之操作頻率可 為 860 MHz至 960 MHz之間。 該結合單元23用以結合該RFID裝置22及該導電基板 21較佳地，該結合單元23係為一黏著膠層。此外，該結 合單元23更可用以保護該RFID裝置22。在本實施例中該 RFID裝置22設置於該結合單元23與該導電基板21之間且 籲 °亥s曰片221及該等導電帶222在該設置區段212之相對 位置上（即該RFID晶片221及該等導電帶222之垂直投影不 覆蓋至該導電基板21)〇該天線結構223與該1^?1〇晶片221 及該等導電帶222形成一迴路，該天線結構223之長度小於 該設置區段212之長度，且不跨覆該設置區段212。 其中，本發明具有導電基板之無線射頻辨識標籤2可應 用於一汽車擋風玻璃，如圖3所示。該汽車擋風玻璃24表 面貼設有隔熱紙25，而該隔熱紙25含有金屬成分，故該隔 熱紙25可等效於圖2中之該導電基板2〗。因此，在該隔熱 133345.doc -9- 201017550 紙25形成一槽孔251，將該RFID裝置22貼設於該隔熱紙25 上’使該RFID裝置22之RFID晶片221及導電帶222不覆蓋 至該隔熱紙25，亦即，該RFID晶片221及該等導電帶222在 該槽孔251之設置區段252之相對位置上，即可發揮如圓2 之具有導電基板之無線射頻辨識標籤2之功效。 參考圖4,其顯示本發明第二實施例具有導電基板之無 線射頻辨識標籤之示意圖。該第二實施例具有導電基板之 參 無線射頻辨識標籤3包括：一導電基板31、一 RFID裝置32 及一結合單元33。該第二實施例具有導電基板之無線射頻 辨識標籤3與上述圖2之第一實施例具有導電基板之無線射 頻辨識標籤2不同之處在於，該第二實施例之該結合單元 33係跨覆該導電基板31之槽孔311之部分設置區段312，該 RFID裝置32則固設於該結合單元33且位於該設置區段312 中。 參考圖5’其顯示本發明第三實施例具有導電基板之無 • 線射頻辨識標籤之示意圖。該第三實施例具有導電基板之 無線射頻辨識標籤4包括：一導電基板41、一 RFID裝置42 及一結合單元43。該第三實施例具有導電基板之無線射頻 辨識標籤4與上述圖2之第一實施例具有導電基板之無線射 頻辨識標籤2不同之處在於，該第三實施例中之該1^1〇裝 置42另包括二延伸金屬片421、422，分別電性連接該rfid 裝置42之天線結構423，且該等延伸金屬片421、422係沿 該導電基板41之槽孔411之設置區段412延伸方向，分別朝 該導電基板4 1之相對二側邊延伸，即，該延伸金屬片421 133345.doc -10· 201017550 朝圖5之上方方向延伸，該延伸金屬片422則相對地朝圖5 之下方方向延伸。 要注意的是’ 一般射頻系統天線係設計咸5〇卩的輸入阻 抗’以便能與傳輸訊號用之同軸線阻抗匹配。但是，在無 線射頻辨識標籤的設計上，所設計RFID裝置之天線結構之 輸入阻抗不再是單純的5〇Ω，而是具有實部及虛部同時存 在的阻抗特性，且RFID晶片有充電電路，使其具有高Q值 ❹ 的特性（虛部值>實部值）’因此增加了 RFID標籤天線設計 上的難度。 對於具有複數阻抗特性之無線射頻辨識標籤，需將天線 的阻抗設計成與RFID晶片阻抗呈共軛的值，才能達到阻抗 匹配的設計要求，以達到最大幅射功率輸出。換言之要 增加無線射頻辨識標籤的有效讀取距離，則RFID晶片與天 線之間必須進行有效的能量交換，當二者的阻抗值達到共 軛匹配（complex conjugate match)時，能量轉換的效率即可 達到最佳化。 本發明則係利用上述之天線設計技巧，調整該槽孔尺 寸形狀，或是調整該天線結構之特性，使構成之該天線 結構旎與該RFID晶片達到阻抗共軛匹配，使該RFID裝置 可直接結合於該導電基板，以達到最大幅射功率輸出。經 實際量測結果’本發明之具有導電基板之無線射頻辨識標 籤在空氣中有效讀取距離可達4 〇至5 〇公尺，且具有全向 性之幅射場形，此讀取規格可符合條線產品之實際應用需 求。 133345.doc 201017550 本發明之具有導電基板之無線射頻辨識標籤之結構及生 產流程簡單，故製作容易且製作成本低廉。並且，藉由調 整該槽孔尺寸、形狀，或是調整該天線結構之特性，本發 明之具有導電基板之無線射頻辨識標籤具有極佳之幅射效 率，故可增加讀取距離。再者，該RFID裝置利用該結合單 元與該導電基板結合，該導電基板及該結合單元可用以支 撐及保護該RFID裝置’因此本發明之具有導電基板之無線 ❺ 射頻辨識標籤具有極佳之耐用性及較長之使用壽命。 上述實施例僅為說明本發明之原理及其功效，並非限制 本發明。因此習於此技術之人士對上述實施例進行修改及 變化仍不脫本發明之精神。本發明之權利範圍應如後述之 申請專利範圍所列。 【圖式簡單說明】 圖1顯示美國專利第6,914,562號之無線射頻辨識系統標 籤之示意圖； • 圖2顯示本發明第一實施例具有導電基板之無線射頻辨 識標籤之示意圖； 圖3顯示本發明具有導電基板之無線射頻辨識標籤應用 於一汽車擋風玻璃之示意圖； 圖4顯示本發明第二實施例具有導電基板之無線射頻辨 識標籤之示意圊；及 圖5顯示本發明第三實施例具有導電基板之無線射頻辨 識標籤之示意圖。 【主要元件符號說明】 133345.doc 201017550The real part impedance in the Smith Chart (the impedance figure of the complex coordinates) is too small and the electromagnetic waves cannot be effectively transmitted. In addition, it is also stated in the specification of U.S. Patent No. 6,914,562 that the substrate 11 must have a thickness of 3 to 6 mm in the UHF band of 860-950 MHz, so that it has a large overall thickness and a relatively high production cost. (ie more material is required) and its readable distance has not improved. Therefore, it is necessary to provide an innovative and progressive radio frequency identification tag having a conductive substrate 以 to solve the above problems. SUMMARY OF THE INVENTION The present invention provides a radio frequency identification tag having a conductive substrate, comprising: a conductive substrate and a radio frequency identification device. The conductive substrate has a slot extending through the conductive substrate and having a mounting section. The radio frequency identification device has a radio frequency identification chip and two conductive strips, and the conductive strips are respectively disposed at two ends of the radio frequency identification chip, and the radio frequency identification chip and the conductive strips are substantially parallel to the set area. Paragraph 设置 settings. The structure and production process of the radio frequency identification tag with the conductive substrate of the present invention are easy to manufacture and low in manufacturing cost. Moreover, by adjusting the size and shape of the slot or adjusting the characteristics of the RFID device, the radio frequency identification tag of the present invention having a conductive substrate has excellent radiation efficiency, thereby increasing the reading distance. Furthermore, the conductive substrate is used to support and protect the RFID device. Thus, the radio frequency identification tag having the conductive substrate of the present invention has excellent durability and a long service life. [Embodiment] 133345.doc 201017550 Referring to FIG. 2, there is shown a schematic diagram of a radio frequency identification tag having a conductive substrate according to a first embodiment of the present invention. The radio frequency identification tag 2 of the first embodiment having a conductive substrate comprises a conductive substrate 21, an RFID device 22 and a bonding unit 23. The conductive substrate 21 has a slot 211 extending through the conductive substrate 21 and having a setting section 212. The conductive substrate 21 can be a metal substrate, wherein the conductive substrate 21 is preferably made of copper. The RFID device 22 has an rfID chip 221, two conductive strips 222, and a 天线 antenna structure 223. The conductive strips 222 are respectively disposed at two ends of the RFID chip 221, and the RFID chip 221 and the conductive strips 222 are substantially The setting section 212 is set in parallel. The RFm device 22 can operate between 860 MHz and 960 MHz. The bonding unit 23 is used to combine the RFID device 22 and the conductive substrate 21. Preferably, the bonding unit 23 is an adhesive layer. Moreover, the combining unit 23 is more useful to protect the RFID device 22. In the embodiment, the RFID device 22 is disposed between the bonding unit 23 and the conductive substrate 21, and the opposite position of the conductive strip 221 and the conductive strips 222 (ie, the RFID) The vertical projection of the 221 and the conductive strips 222 does not cover the conductive substrate 21). The antenna structure 223 forms a loop with the NAND wafer 221 and the conductive strips 222. The length of the antenna structure 223 is less than The length of the section 212 is set and does not span the setup section 212. Wherein, the radio frequency identification tag 2 of the present invention having a conductive substrate can be applied to a windshield of a car, as shown in FIG. The heat insulating paper 25 is attached to the surface of the automobile windshield 24, and the heat insulating paper 25 is equivalent to the conductive substrate 2 in Fig. 2. Therefore, the heat insulation 133345.doc -9- 201017550 paper 25 forms a slot 251, and the RFID device 22 is attached to the heat insulation paper 25. The RFID chip 221 and the conductive tape 222 of the RFID device 22 are not Covering the heat-insulating paper 25, that is, the RFID chip 221 and the conductive strips 222 are located at opposite positions of the set portion 252 of the slot 251, thereby performing radio frequency identification of the conductive substrate such as the circle 2. The effect of label 2. Referring to Figure 4, there is shown a schematic diagram of a radio frequency identification tag having a conductive substrate in accordance with a second embodiment of the present invention. The second embodiment has a conductive substrate. The radio frequency identification tag 3 includes a conductive substrate 31, an RFID device 32, and a combining unit 33. The radio frequency identification tag 3 having the conductive substrate of the second embodiment is different from the radio frequency identification tag 2 having the conductive substrate of the first embodiment of FIG. 2 in that the combining unit 33 of the second embodiment is overlaid. A portion of the slot 311 of the conductive substrate 31 is provided with a section 312, and the RFID device 32 is fixed to the bonding unit 33 and located in the setting section 312. Referring to Figure 5', there is shown a schematic diagram of a radio frequency identification tag having a conductive substrate in accordance with a third embodiment of the present invention. The radio frequency identification tag 4 of the third embodiment having a conductive substrate comprises a conductive substrate 41, an RFID device 42, and a combining unit 43. The radio frequency identification tag 4 having the conductive substrate of the third embodiment is different from the radio frequency identification tag 2 having the conductive substrate of the first embodiment of FIG. 2 in that the device of the third embodiment is different. 42 further includes two extending metal pieces 421 and 422 electrically connected to the antenna structure 423 of the rfid device 42 respectively, and the extending metal pieces 421 and 422 extend along the setting section 412 of the slot 411 of the conductive substrate 41. And extending toward the opposite sides of the conductive substrate 41, that is, the extended metal piece 421 133345.doc -10· 201017550 extends toward the upper direction of FIG. 5, and the extended metal piece 422 is opposite to the lower side of FIG. The direction extends. It should be noted that the 'general RF system antenna system is designed with a 5 〇卩 input impedance' to match the impedance of the coaxial line used for the transmission signal. However, in the design of the RFID tag, the input impedance of the antenna structure of the designed RFID device is no longer a simple 5 〇Ω, but has the impedance characteristics of both the real part and the imaginary part, and the RFID chip has a charging circuit. It has a high Q value (the imaginary value > real value)' thus increasing the difficulty in designing the RFID tag antenna. For RFID tags with complex impedance characteristics, the impedance of the antenna should be designed to be conjugate with the impedance of the RFID chip to meet the impedance matching design requirements to achieve maximum radiated power output. In other words, to increase the effective reading distance of the RFID tag, an effective energy exchange must be performed between the RFID chip and the antenna. When the impedance values of the two are conjugate match, the efficiency of energy conversion can be Optimized. In the present invention, the antenna design technique is used to adjust the size and shape of the slot, or to adjust the characteristics of the antenna structure, so that the antenna structure 构成 is matched with the RFID chip to achieve impedance matching, so that the RFID device can directly The conductive substrate is bonded to achieve maximum radiation power output. According to the actual measurement result, the radio frequency identification tag with the conductive substrate of the present invention can effectively read the distance in the air up to 4 〇 to 5 〇 meters, and has an omnidirectional radiation field shape, and the reading specification can be Meet the actual application needs of the line products. 133345.doc 201017550 The radio frequency identification tag with the conductive substrate of the present invention has a simple structure and a simple production process, so that the fabrication is easy and the manufacturing cost is low. Moreover, by adjusting the size and shape of the slot or adjusting the characteristics of the antenna structure, the radio frequency identification tag with the conductive substrate of the present invention has excellent radiation efficiency, thereby increasing the reading distance. Furthermore, the RFID device is coupled to the conductive substrate by the bonding unit, and the conductive substrate and the bonding unit can be used to support and protect the RFID device. Therefore, the wireless 射频 RFID tag with the conductive substrate of the present invention has excellent durability. Sex and long service life. The above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention should be as set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a radio frequency identification system tag of US Pat. No. 6,914,562; FIG. 2 is a schematic diagram showing a radio frequency identification tag having a conductive substrate according to a first embodiment of the present invention; FIG. 4 is a schematic diagram showing a radio frequency identification tag having a conductive substrate according to a second embodiment of the present invention; and FIG. 5 is a diagram showing a third embodiment of the present invention. Schematic diagram of the radio frequency identification tag of the substrate. [Main component symbol description] 133345.doc 201017550
1 習知之RFID標藏 11 牆板 12 導電標籤 13 RFID裝置 14 無線頻率反射結構 15、16 饋入點 2 本發明第一實施例具有導電基板之無 線射頻辨識標籤 21 導電基板 211 槽孔 212 設置區段 22 RFID裝置 221 RFID晶片 222 導電帶 223 天線結構 23 結合單元 24 汽車擋風玻璃 25 隔熱紙 251 槽孔 252 設置區段 3 本發明第二實施例具有導電基板之無 線射頻辨識標籤 31 導電基板 311 槽孔 133345.doc -13- 2010175501 conventional RFID tag 11 wall panel 12 conductive tag 13 RFID device 14 wireless frequency reflecting structure 15, 16 feeding point 2 first embodiment of the present invention has a radio frequency identification tag 21 of a conductive substrate conductive substrate 211 slot 212 setting area Section 22 RFID device 221 RFID chip 222 Conductive tape 223 Antenna structure 23 Bonding unit 24 Automobile windshield 25 Insulation paper 251 Slot 252 Setting section 3 The second embodiment of the present invention has a radio frequency identification tag 31 of a conductive substrate 311 slot 133345.doc -13- 201017550
312 32 33 4 41 411 412 42 421 ' 422 423 43 設置區段 RFID裝置 結合單元 本發明第三實施例具有導電基板之無 線射頻辨識標籤 導電基板 槽孔 設置區段 RFID裝置 延伸金屬片 天線結構 結合單元312 32 33 4 41 411 412 42 421 '422 423 43 Setting section RFID device Binding unit The third embodiment of the present invention has a radio frequency identification tag of a conductive substrate. Conductive substrate Slots Setting section RFID device Extension metal piece Antenna structure Combination unit
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