1298139 九、發明說明： 【潑^明月^属】 發明領域 本發明係有關於天線及裝载該天線之識別卡，且特別 5是有關於以與RFED讀寫器進行收發訊號且適用於非接觸型 識別卡之環形天線所構成的天線，及裝載該天線之&打〇用 識別卡。 • L先前技術3 發明背景 10 近年來，在包含家畜動物等生物之物品上附加記載物 品資訊之識別卡，並以非接觸方式讀取該資訊且實行資料 之管理的系統是很普遍的。 此系統之一例係被稱為!^(無線頻率)ID系統。在該系 統中，使用UHF帶(860〜960MHz)無線訊號並由讀寫器發送 15 出約1W的訊號。 φ 在識別卡側生成用以最初啟動該訊號之電力，且更將 對應包含於該訊號之指令資訊由識別卡側將應答訊號送回 讀寫器侧。藉此可由讀寫器側讀取識別卡内的資料。 物品所附之識別卡，係由天線與連接天線之機能晶片 20所構成。識別卡與讀寫器之間的距離，雖然會受到識別卡 内建天線之增益、晶片之動作電壓或周圍環境等之影響， 但一般說來為3m左右。 在此，識別卡所裝载LSI晶片20之介面部係，如說明天 線與LSI晶片之匹配之第丨圖所示，可利用電阻Rc(例如電阻 1298139 值=1000Ω)與電容c(例如電容值=〇.7pF)之並聯等效地表 不。另一方面’識別卡所裝載之天線(稱為識別卡天線)1可 利用電阻Ra(例如電阻值=1〇〇〇Ω)與電感L(例如電感值 =40nH)之並聯等效地表示。 5 藉由將電阻與天線兩者並聯，使電容值C與電感值L產 生共振’並由式（1)可知，虛數部分匹配成大略為〇，且在識 別卡天線ίο之接收電源充分供給至LSI晶片2〇。 [數學式1] f — 1 “一 2π掘 · ••式（1) 識別卡天線10係通常基本上為全長λ/2共振型之偶極 天線’且UHF帶必須為15〇mm。但，例如考慮到將識別卡 貼附於家畜的耳朵並做管理等情況下，則需作成最大直徑 35mm左右的大小。 但是，以那樣所要求的大小來作成λ/2共振型偶極天 15線幾乎是不可能。 口此如第2圖所示，有人使用由連接於供電端子3之環 形天線1所構成之環形天線。例如，環形天線係具有非專利 文獻1解說之特性者。即，其中制了當連接於供電端子3 20之圓型迴路1 一樣地流動著同相電流時，隨著迴路半徑變 大’電力模式之波瓣數量也隨之增加。 非專利文獻i ••天線工學手冊，咖22(平成畔3月5 曰歐姆社（才一厶社)發行） 【發明内容】 1298139 發明欲解決之問題 在此，如上述使用於RFID系統之識別卡中，如第旧 所示，LSI晶片20側介面部之電容值c與識別卡天線1〇之電 感值L係利用使用頻率產生共振，而這在關於晶片2〇與識別 5 卡天線1〇之間的匹配方面是最重要的。 對此，識別卡天線10若是如第2圖所示只是由環形天線 構造所構成時，由於沒有第！圖所示電感L的部分，則乙幻 晶片20之介面部不能實行良好的匹配，且也不能由識別卡 天線10充分地供給電力至晶片20侧，會有使通訊距離極端 1〇 地減少之不合宜處。 又，為了處理的方便上，識別卡天線10收納於介電體 之盒體中作為一單元用時，必須作成充分一併考慮作為盒 體使用之介電體介電率或厚度之天線形狀。 口此本發明之目的在於提供在有限大小内與具有電 15容組件之RFIDffiLSI晶片共振之識別卡元線，及裝載該天線 之RFID用識別卡。 解決問題之手段 可達成上述目的之本發明天線，其第丨形態包含有： 供電端子； 20 環形天線，連接於前述供電端子；及 方通導電路，旁通前述環形天線之迴路。 可達成上述目的之本發明天線，其第2形態之特徵在於 在第1形態中： 、 刚述旁通導電路配置於與前述環形天線中心相距一距 1298139 * 離處，及刖述距離之大小係設定為使前述旁通導電路之電 感成為顇定電感值者。 町達成上述目的之本發明天線，其第3形態之特徵在於 在第2形態中： 5 前述預定電感值係與連接前述供電端子之LSI晶片的 介面部電容值產生共振之值。 f達成上述目的之本發明RnD用識別卡，其第i形熊 Φ 包含有： 天線；及 10 LSI晶片，與前述天線並聯； 又，前述天線包含有： 供電端子，與前述LSI晶片連接； 環形天線’連接於前述供電端子；及 旁通導電路，旁通前述環形天線之迴路。 15 可達成上述目的之本發明RFID用識別卡，其第2形態 φ 之特徵在於在RFID用識別卡第1形態中·· 如述旁通導電路配置於與前述環形天線中心相距一距 離S處，且前述距離s之大小係設定為使前述旁通導電路之 電感成為預定電感值者。 20 可達成上述目的之本發明RFID用識別卡，其第3形態 之特徵在於在RFID用識別卡第2形態中： 前述預定電感值係與連接前述供電端子之LSI晶片的 介面部電容值產生共振之值。 可達成上述目的之本發明RFID用識別卡，其第4形態 1298139 之特徵在於在RFID用識別卡第1形態中，更包含： 至少配置於前述天線之一面，且可保持前述天線之介 電體板。 可達成上述目的之本發明RFID用識別卡，其第5形能 5之特徵在於在RFID用識別卡第4形態中： 前述介電體板之中心設有貫穿孔。 可達成上述目的之本發明RFID用識別卡，其第6形態 ϋ 之特徵在於在RFID用識別卡第5形態中： 前述旁通導電路，具有避開前述貫穿孔且沿著該貫穿 10孔周邊延伸之弧形。 可達成上述目的之本發明RHD用識別卡，其第7形態 之特徵在於在RFID用識別卡第4形態中： 前述介電體板具有環狀溝槽，前述環狀溝槽對應前述 環形天線’且具有至少可收納前述LSI晶片之寬度與深度。 15 可達成上述目的之本發明RFID用識別卡，其第8形態 # 之特徵在於在RFID用識別卡第4形態中： 前述天線係於薄板上以導體形成者，且該導體係以 鋼、銀、鋁其中之一為主成分。 發明之效果 2〇 藉由本發明，可在直徑35mm左右非常有限的面積内， 提供給與具有電容組件之RFID用片共振之天線，及裝 載該天線之識別卡。 圖式簡單說明 第1圖係說明天線與LSI晶片之匹配。 1298139 ·* 第2圖係說明習知之環形天線。 第3圖係說明本發明天線之構成原理。 第4圖係顯示電感值L與環形天線丨中心至旁通導電線2 之間距離S的關係之圖表。 5 第5A、5B圖顯示依第3圖所示本發明原理之第1實施 例。 第6A、6B圖係考慮到用以將^^仍用識別卡安裝於物品 0 上之構造實施例。 第7A、7B圖係相對於第5圖之實施例，考慮用以將RFm 10用識別卡安裝於物品上之構造實施例。 第8A、8B與8C圖係LSI晶片與識別卡天線一體成形之 實施例。 第9A、9B圖顯示其他實施例之構成。 第10A、10B圖係顯示只有識別卡天線之一側形成介電 15 體之實施例。 # 第11A、圖係顯示本發明天線之電磁場模擬所得之 天線指向特性圖。 第12圖顯示於第u圖中三軸方向X、y、z之定義。 【貧施方式】 2〇實施發明之最佳形態 以下配合圖式說明本發明之實施形態例。又，實施之 形心例係用以理解本發明者，且本發明之技術範圍並不限 定於此。 本發明之原理 1298139 於此，在說明實施例之前，先利用第3圖說明本發明天 線之構成原理。在第3圖中，形成有連接於供電端子3之環 形天線1，且在環形天線丨内部形成旁通導電線以作為匹配 用電感L。又，根據在第3圖中，s係旁通導電線2與所形成 5之環形天線1中心之間的距離，且依據距離S之大小，由旁 通導電線2產生之電感值l之參數(s)會變化。 第4圖係顯示電感值!^與環形天線丨中心至旁通導電線2 之間距離S的關係圖表。第4圖所示之數值係經由電磁場模 擬所得之計算值，且能由此了解電感值[乃依環形天線 10心之距離S而產生變化。因此，藉由適當地選擇距離8可設 定LSI晶片20之介面部的電容值c以及匹配之識別卡天線1〇 之電感值L。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna and an identification card for loading the antenna, and in particular, 5 relates to transmitting and receiving signals with an RFED reader and is suitable for non-contact. An antenna composed of a loop antenna of a type identification card, and an identification card for loading the & • L. Prior Art 3 Background of the Invention In recent years, it has become common to attach an identification card that records information on articles including animals such as livestock animals, and to read the information in a non-contact manner and to manage the data. An example of this system is called the !^ (radio frequency) ID system. In this system, a UHF band (860 to 960 MHz) wireless signal is used and a signal of about 1 W is transmitted by the reader. φ generates power for initial activation of the signal on the identification card side, and further sends the response signal to the reader/writer side by the identification card side corresponding to the command information included in the signal. Thereby, the data in the identification card can be read by the reader/writer side. The identification card attached to the article is composed of an antenna and a functional chip 20 connected to the antenna. The distance between the identification card and the reader/writer is affected by the gain of the built-in antenna of the identification card, the operating voltage of the chip, or the surrounding environment, but it is generally about 3 m. Here, the interface system of the LSI chip 20 on which the identification card is mounted, as shown in the second diagram illustrating the matching of the antenna and the LSI chip, can utilize a resistor Rc (for example, a resistor 1298139 value = 1000 Ω) and a capacitor c (for example, a capacitance value). The parallel connection of =〇.7pF) is equivalent. On the other hand, the antenna on which the identification card is loaded (referred to as the identification card antenna) 1 can be represented by the parallel connection of the resistance Ra (e.g., resistance value = 1 〇〇〇 Ω) and the inductance L (for example, inductance value = 40 nH). 5 By connecting the resistor and the antenna in parallel, the capacitance value C and the inductance value L are resonated' and it is known from the equation (1) that the imaginary part is matched to be substantially 〇, and the receiving power supply of the identification card antenna ίο is sufficiently supplied to LSI chip 2〇. [Math. 1] f — 1 “a 2π dig · • • (1) The identification card antenna 10 is usually a substantially full-length λ/2 resonance type dipole antenna 'and the UHF band must be 15 〇 mm. For example, in consideration of attaching an identification card to the ear of a livestock and managing it, it is necessary to make a maximum diameter of about 35 mm. However, the λ/2 resonance type dipole day 15 line is almost the same size. It is impossible. As shown in Fig. 2, a loop antenna composed of a loop antenna 1 connected to the power supply terminal 3 is used. For example, the loop antenna has the characteristics described in Non-Patent Document 1. That is, When the in-phase current flows in the same manner as the circular circuit 1 connected to the power supply terminal 3 20, the number of lobes in the power mode increases as the radius of the circuit becomes larger. Non-Patent Document i • Antenna Engineering Manual,咖 22 (April 5, 成 社 社 才 才 【 【 【 【 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 The capacitance value c of the side surface of the wafer 20 is The inductance value L of the identification card antenna 1 系 is generated by the use frequency, and this is most important in terms of matching between the wafer 2 〇 and the identification 5 card antenna 1 . For this, the identification card antenna 10 is as 2, when only the loop antenna structure is formed, since there is no part of the inductance L shown in the figure, the interface of the phantom chip 20 cannot be well matched, and cannot be sufficiently supplied by the identification card antenna 10. When the power is applied to the chip 20 side, it is not preferable to reduce the communication distance by an extremely small amount. Further, for the convenience of processing, the identification card antenna 10 must be formed as a unit when it is housed in the case of the dielectric body. The antenna shape of the dielectric dielectric or thickness used as the cartridge is fully considered. The purpose of the present invention is to provide an identification card line that resonates with an RFID ffiLSI chip having an electrical 15-capacity component within a limited size, and An RFID identification card for loading the antenna. The antenna of the present invention for achieving the above object, the third aspect of the invention includes: a power supply terminal; 20 a loop antenna connected to the foregoing An electric terminal; and a square conduction circuit bypassing the loop antenna. The antenna of the present invention which achieves the above object is characterized in that, in the first aspect, the bypass conduction circuit is disposed in the foregoing The center of the loop antenna is separated by a distance of 1298139 *, and the size of the distance is set so that the inductance of the bypass conductive circuit becomes the rated inductance value. The antenna of the present invention which achieves the above object has the characteristics of the third form. In the second aspect, the predetermined inductance value is a value that resonates with the dielectric capacitance value of the LSI wafer to which the power supply terminal is connected. The identification card of the RnD of the present invention which achieves the above object has an i-th shape bear Φ included. An antenna; and a 10 LSI chip connected in parallel with the antenna; wherein the antenna includes: a power supply terminal connected to the LSI chip; a loop antenna 'connected to the power supply terminal; and a bypass conduction circuit bypassing the loop antenna The circuit. An RFID identification card according to the present invention which achieves the above object, wherein the second aspect φ is characterized in that, in the first aspect of the RFID identification card, the bypass conduction circuit is disposed at a distance S from the center of the loop antenna. And the magnitude of the distance s is set such that the inductance of the bypass conduction circuit becomes a predetermined inductance value. According to a second aspect of the RFID identification card, in the second aspect of the RFID identification card, the predetermined inductance value resonates with a dielectric capacitance value of an LSI wafer connected to the power supply terminal. The value. According to a fourth aspect of the present invention, in the first aspect of the RFID identification card, the RFID identification card of the present invention further includes: a dielectric body that is disposed on at least one of the antennas and that holds the antenna board. The identification card for RFID of the present invention which achieves the above object is characterized in that in the fourth aspect of the RFID identification card, a through hole is provided in the center of the dielectric plate. According to a fifth aspect of the RFID identification card, in the fifth aspect of the RFID identification card, the bypass guide circuit has a bypass hole and a periphery of the through hole 10 Extending the arc. According to a fourth aspect of the present invention, in the fourth aspect of the RFID identification card, the dielectric plate has an annular groove, and the annular groove corresponds to the loop antenna. And having at least the width and depth of the LSI wafer. An identification card for RFID according to the present invention which achieves the above object, characterized in that in the fourth aspect of the identification card for RFID, the antenna is formed by a conductor on a thin plate, and the guide system is made of steel or silver. One of the aluminum is the main component. Advantageous Effects of Invention According to the present invention, an antenna for resonating an RFID chip having a capacitor module and an identification card for mounting the antenna can be provided in a very limited area of about 35 mm in diameter. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates the matching of an antenna to an LSI chip. 1298139 ·* Figure 2 illustrates a conventional loop antenna. Fig. 3 is a view showing the constitution principle of the antenna of the present invention. Fig. 4 is a graph showing the relationship between the inductance value L and the distance S from the center of the loop antenna to the bypass conductive line 2. 5 Figures 5A and 5B show a first embodiment of the principle of the present invention shown in Fig. 3. The 6A and 6B drawings take into consideration a configuration example for mounting the identification card on the article 0. 7A and 7B are structural embodiments for mounting an RFm 10 identification card to an article with respect to the embodiment of Fig. 5. The 8A, 8B, and 8C are embodiments in which the LSI chip and the identification card antenna are integrally formed. Figures 9A and 9B show the construction of other embodiments. Figs. 10A and 10B show an embodiment in which only one side of the identification card antenna forms a dielectric body. #第11A的图图 shows an antenna pointing characteristic diagram obtained by electromagnetic field simulation of the antenna of the present invention. Fig. 12 shows the definition of the three-axis directions X, y, and z in Fig. u. [Effective Mode] 2 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Further, the embodiment of the invention is used to understand the inventors, and the technical scope of the present invention is not limited thereto. Principles of the Invention 1298139 Here, prior to the description of the embodiments, the principle of construction of the antenna of the present invention will be described using FIG. In Fig. 3, a loop antenna 1 connected to the power supply terminal 3 is formed, and a bypass conductive line is formed inside the loop antenna 以 as a matching inductor L. Further, according to the distance between the s-side bypass conductive line 2 and the center of the loop antenna 1 formed 5 in FIG. 3, and the parameter of the inductance value 1 generated by the bypass conductive line 2 according to the magnitude of the distance S (s) will change. Fig. 4 is a graph showing the relationship between the inductance value and the distance S from the center of the loop antenna 旁 to the bypass conductive line 2. The numerical value shown in Fig. 4 is a calculated value obtained by electromagnetic field simulation, and it can be understood from the inductance value [which varies depending on the distance S of the loop antenna 10 core. Therefore, the capacitance value c of the face portion of the LSI wafer 20 and the inductance value L of the matched identification card antenna 1A can be set by appropriately selecting the distance 8.
例如，用作匹配之LSI晶片20之電容C的電容值 C=0.7pF，根據上述式⑴，f=95〇MHz左右時，會以L=4〇nH 15產生共振。因此根據第4圖，L=40nH時，且如第3圖將天線 置於空中時，空氣之介電率灯(=〇)，則依特性曲線A得知 S=4.2mm，由此可讀取識別卡天線1〇與1^1晶片2〇之匹配情 形。 又’本發明者等人，由多次的試作實驗中確認識別卡 20在天線10之尺寸為最外外型33mm，並使用銅作為導體材 料’且厚度為20μπι，線寬為2mm時之天線並聯電阻Ra的電 阻值約為1000Ω。因此，即使LSI晶片20之實部分電阻Rc為 例如1000Ω〜2000Ω，也能夠充分地匹配。 在第3圖中，可於由環形天線丨及旁通導電線2所構成之 11 1298139 ' m平面的上下或單面上形成介電體板，以固持識別卡天 線ίο。此時，最好可對應介電體板之介電率、厚度來選擇 參數(S)。 實施例 5 帛5圖係顯示依第3圖所示本發明原理之第1實施例。第 5A圖係平面圖而第53圖係中央截面圖。 環形天線1及料導電線2所構紅制卡天線1〇之天 • 、線平面的上下配置介電體板4、5，並央住識別卡天線10以 保持，、1狀。因此’介電體板4、5可利用例如樹脂黏著劑 10等夾住並黏著識別卡天線10。 ,該實施例對應第3圖之原理圖，連接於供電端子3之環 $天線1的中途連接旁通導電線2，並形成電感組件[。 實施例之尺寸係，識別卡天線10之最外外型為33mm， 使用銅作為導雜料，且其厚度為2()师，職為2·。介 15電體板4、5之厚度t=lmm。 • 若以塑膠、橡膠等材料製成之介電體板4、5的介電率， 大約取㈣〜5的值是已知的。目此，以電磁場模擬並以㈣ 及㈣為求得特性時，分別為於顯示為第4圖中之特性曲線 Β、特性曲線c。 同樣&工氣之”電率ει：=()時之特性曲線a中，電感值 L係隨距離S而變化’且由環形天彰之迴路中心〇到旁通導 ^線距離為s。依據上述第顿所示之電磁場模擬所 知之n十开值且根據第5圖顯示之構成中，當介電體板*、$ 之介電率㈣時’對應雜曲線B ;而當叫時，對應特性 12 1298139 曲線C。因此可知’為了以L=4〇nH共振，εΓ=3時以S=6mm 為佳’ εΓ=5時則以S=7.5mm為佳。 在此，必須考慮用以將RFID用識別卡安裝於物品上之 構造。第6圖係對應此必要性之實施例，其中RFID用識別卡 5之中央形成貫穿孔6。利用該貫穿孔6可將識別卡安裝於物 品上。但，由於貫穿孔7形成於中心，貫穿孔6將會與旁通 導電線2重疊。因此，在第6圖之實施例中，為了使旁通導 電線2避開貝穿孔6，沿著貫穿孔6周邊具有孤部2a。固定該 弧部2a，並取得該弧部與旁通導電線2直線形狀的導電線部 10分之間距離S之參數，且做電磁場模擬之結果，與根據第4 圖所顯示ε r=3或ε r=5之特性曲線A、特性曲線B是一致的。 在第6圖中，當貫穿孔6之半徑ri=6.5mm，導體寬度為 2mm，且距離S在（貫穿孔6之半徑+導體寬度）以上（即 S>8.5mm)時，與實施例1同樣地，例如，晶片之電容值為 15 C=0_7pF時’根據式 1，f=95〇MHz左右時，係以L=4〇nHit 振。 根據第4圖’ L=40nH的情況下，ει:=3時則s=6_lmm，且 εΓ=5時則S=7.5mm，因此在第6圖顯示之天線中，藉由選擇 適當的S用以形成所對應之電介質常數，可匹配晶片2〇與天 20 線 10。 苐7圖係$又置貝牙孔6之實施例，且相對於第5圖所干之 實施例，由於貫穿孔6之半徑大小小於旁通導電線2之環形 天線1中心起之距離S ’因此構成上沒有必要設置如第6圖顯 示之弧部2a。 13 1298139 - 在此，LSI晶片20最好可與識別卡天線1〇一體成形。第 8圖係對應該要求之構成實施例。 第8圖係對應第6圖且將晶片20連接至環形天線丨與旁 通導電路2構成之識別卡天線1〇的供電端子。第认圖係於介 5電體板5上裝載有識別卡天線1〇與LSI晶片的圖。 另一方面，第8B圖係介電體板4,且其特徵在於具有對 應環形天線1之環狀溝槽30。溝槽30具有至少可收納厚度為 # 〇.5m_LSI晶片20之寬度與深度，因此，藉由依序重二 合介電體板5、連接LSI晶片之20識別卡天線1〇及介電體板 10 4，可如第8C圖所示地形成一體。 本發明之特徵為重疊組合時，LSI晶片2〇無論在哪個位 置，介電體板4之溝槽30均可確保具有可容納LSI晶片2〇之 空間，因此可使上下介電體板4、5緊密貼合。藉此，可減 少上下介電體板4、介電體板5炎住識別卡天線之工時， 15 並能提供廉價的天線單元。 • 第9圖係其他實施例之構成。於上述各實施例中，環形 天線1及旁通導電體2所構成之識別卡天線1〇的製作方法係 可於紙或PET(聚乙烯板）等非常薄的板4〇(例如〇 lmm)上， 利用以銅、銀、鋁等（例如厚度為20μιη)作為材料而之薄導 20電體形成。或者，亦可使用電線狀的導線來取代薄導電體。 又，於上述實施例中，雖然顯示的是以介電體4、5夾 住由環形天線1及旁通導電體2所構成之識別卡天線1〇之構 造，但由固持識別卡天線10的觀點來看，如第1〇圖所示， 介電體4(5)亦可能只形成識別卡天線1〇之一側。 14 1298139 帛11圖係顯示本發明電磁賴得之天線指 向特性圖。三軸方向x、y、z之定義如第12圖所示，又，X、 y平面中相對X軸之角度為Φ，而相對z軸之角度為β。 、。第ha圖顯示Φ=9〇。，即於y軸方向上相對ζ軸之角度㊀ 5為90及90日夺’具有之最大指向特性。又，第ηΒ圖顯示 Φ=〇。，即於X軸方向上相對ζ軸之角度_〇。及一9〇。時，具 有之最大指向特性。大致上，於第11Α圖、第11Β圖皆顯示 _ 相同的指向特性，但相較於φ==0。（第11Β圖），φ=90。（第以 圖）更趨向於具有指向性並得到環形天線特有之結果。 10 目此’由此指向特性可了解到本發明天線具有較佳之 才曰向特性。因此，使祕載本發明天狀RF咖識別卡於 物品上而成為RF则朗卡時，也能刺於如動物等會動 的物品，適用範圍相當廣泛。藉由本發明，可在直㈣職 左右非常有限的面積内，提供與具有電容組件之 15曰曰片共振之天、線，及裝載該天線之RFID用識別卡。For example, the capacitance C of the capacitor C used as the matching LSI wafer 20 has a C value of 0.7 pF, and according to the above formula (1), when f = 95 〇 MHz, resonance occurs at L = 4 〇 nH 15 . Therefore, according to Fig. 4, when L=40nH, and when the antenna is placed in the air as shown in Fig. 3, the dielectric light of the air (=〇) is obtained according to the characteristic curve A, S=4.2mm, thereby being readable Take the match between the identification card antenna 1〇 and the 1^1 wafer 2〇. Further, the inventors of the present invention confirmed that the identification card 20 has an outermost outer shape of 33 mm in the size of the antenna 10, and uses copper as a conductor material and has a thickness of 20 μm and a line width of 2 mm. The parallel resistor Ra has a resistance value of about 1000 Ω. Therefore, even if the real partial resistance Rc of the LSI wafer 20 is, for example, 1000 Ω to 2000 Ω, it can be sufficiently matched. In Fig. 3, a dielectric plate can be formed on the upper or lower side or on one side of the 11 1298139 'm plane formed by the loop antenna 丨 and the bypass conductive line 2 to hold the identification card antenna ίο. In this case, it is preferable to select the parameter (S) in accordance with the dielectric constant and thickness of the dielectric board. Embodiment 5 Fig. 5 shows a first embodiment of the principle of the present invention shown in Fig. 3. Fig. 5A is a plan view and Fig. 53 is a central sectional view. The loop antenna 1 and the material conductive wire 2 are configured to form a red card antenna. • The dielectric plates 4 and 5 are disposed above and below the line plane, and the identification card antenna 10 is held to hold the shape. Therefore, the dielectric plates 4, 5 can be sandwiched and adhered to the identification card antenna 10 by, for example, the resin adhesive 10. This embodiment corresponds to the schematic diagram of FIG. 3, and is connected to the loop of the power supply terminal 3 in the middle of the antenna 1 to connect the bypass conductive line 2, and forms an inductance component [. In the size of the embodiment, the outermost shape of the identification card antenna 10 is 33 mm, copper is used as a guide material, and the thickness thereof is 2 (), and the position is 2·. The thickness of the electrical plates 4, 5 is t = 1 mm. • If the dielectric constants of dielectric plates 4 and 5 made of plastic, rubber, etc., are approximately (4) to 5, the values are known. Therefore, when the electromagnetic field is simulated and (4) and (4) are used as the characteristics, they are shown as the characteristic curve 特性 and the characteristic curve c in Fig. 4, respectively. In the characteristic curve a of the same electric power ει:=(), the inductance value L changes with the distance S' and the distance from the center of the loop of the ring to the bypass guide line is s. According to the electromagnetic field simulation shown in the above-mentioned Diton, the n-th opening value is known, and according to the configuration shown in FIG. 5, when the dielectric plate*, the dielectric constant of the dielectric plate (4) is 'corresponding to the miscellaneous curve B; Corresponding characteristic 12 1298139 curve C. Therefore, it is known that 'for the resonance of L=4〇nH, εΓ=3 is preferably S=6mm' εΓ=5, then S=7.5mm is preferred. Here, it must be considered A configuration for attaching an RFID identification card to an article. Fig. 6 is an embodiment corresponding to the necessity, wherein a center of the RFID identification card 5 forms a through hole 6. The identification hole can be used to mount the identification card to the article. However, since the through hole 7 is formed at the center, the through hole 6 will overlap with the bypass conductive line 2. Therefore, in the embodiment of Fig. 6, in order to prevent the bypass conductive line 2 from avoiding the perforation 6, The periphery of the through hole 6 has an orphan portion 2a. The arc portion 2a is fixed, and the conductive portion 10 having the linear shape of the arc portion and the bypass conductive line 2 is obtained. The distance between the parameters of S and the result of the electromagnetic field simulation is consistent with the characteristic curve A and the characteristic curve B of ε r=3 or ε r=5 shown in Fig. 4. In Fig. 6, when When the radius ri of the hole 6 is 6.5 mm, the width of the conductor is 2 mm, and the distance S is equal to or larger than the radius (the width of the through hole 6 + the conductor width) (that is, S > 8.5 mm), the capacitance of the wafer is, for example, the same as in the first embodiment. When the value is 15 C=0_7pF, 'According to Equation 1, when f=95〇MHz, the vibration is L=4〇nHit. According to Figure 4, where L=40nH, ει:=3, then s=6_lmm And ε Γ = 5 then S = 7.5 mm, so in the antenna shown in Fig. 6, by selecting the appropriate S to form the corresponding dielectric constant, the wafer 2 〇 and the day 20 line 10 can be matched. The embodiment of the figure is further provided with the beating hole 6, and with respect to the embodiment of the fifth embodiment, since the radius of the through hole 6 is smaller than the distance S' of the center of the loop antenna 1 of the bypass conductive line 2, it constitutes It is not necessary to provide the arc portion 2a as shown in Fig. 6. 13 1298139 - Here, the LSI wafer 20 is preferably integrally formed with the identification card antenna 1 。. Fig. 8 corresponds to The figure 8 is a power supply terminal corresponding to the sixth figure and connecting the wafer 20 to the identification card antenna 1A formed by the loop antenna 丨 and the bypass conduction circuit 2. The first figure is based on the dielectric board. 5 is a diagram of the identification card antenna 1 〇 and the LSI wafer. On the other hand, the 8B is a dielectric plate 4 and is characterized by having an annular groove 30 corresponding to the loop antenna 1. The groove 30 has at least The thickness and depth of the 20.5m_LSI wafer 20 can be accommodated. Therefore, by sequentially multiplexing the dielectric board 5 and connecting the LSI chip 20 identification card antenna 1 and the dielectric board 10 4, Formed in one piece as shown in Fig. 8C. The present invention is characterized in that, in the overlapping combination, the LSI wafer 2 can be positioned at any position, and the trench 30 of the dielectric plate 4 can ensure a space for accommodating the LSI wafer 2, so that the upper and lower dielectric plates 4 can be 5 close fit. Thereby, the working hours of the upper and lower dielectric plates 4 and the dielectric plate 5 to insulate the identification card antenna can be reduced, and an inexpensive antenna unit can be provided. • Figure 9 is a block diagram of other embodiments. In the above embodiments, the identification card antenna 1A formed by the loop antenna 1 and the bypass conductor 2 can be formed on a very thin board such as paper or PET (polyethylene sheet) (for example, 〇lmm). The thin conductor 20 is formed by using copper, silver, aluminum or the like (for example, a thickness of 20 μm) as a material. Alternatively, a wire-like wire may be used instead of the thin conductor. Further, in the above embodiment, the structure in which the identification card antenna 1A composed of the loop antenna 1 and the bypass conductor 2 is sandwiched by the dielectric bodies 4, 5 is shown, but the identification card antenna 10 is held by From the point of view, as shown in Fig. 1, the dielectric body 4 (5) may also form only one side of the identification card antenna 1 。. 14 1298139 The Fig. 11 shows the antenna pointing characteristic diagram of the electromagnetic ray of the present invention. The three-axis directions x, y, and z are defined as shown in Fig. 12, and the angles with respect to the X-axis in the X and y planes are Φ, and the angles with respect to the z-axis are β. ,. The ha chart shows Φ=9〇. That is, the angle of the y-axis in the y-axis direction is 5 and the 90-day y has the largest directivity characteristic. Also, the ηΒ diagram shows Φ=〇. , that is, the angle _〇 relative to the x-axis in the X-axis direction. And one-9. It has the largest pointing characteristics. In general, both the 11th and 11th figures show the same directional characteristic, but compared to φ==0. (Figure 11), φ = 90. (Picture) tends to be more directional and has the unique result of loop antennas. It is understood from the fact that the antenna of the present invention has a better directional characteristic. Therefore, when the secret RF coffee identification card of the present invention is applied to the article and becomes RF, it can also be used for objects such as animals, and the scope of application is quite wide. According to the present invention, it is possible to provide a day, a line, and an RFID identification card for loading the antenna with a radius of 15 pieces of the capacitor assembly in a very limited area of the direct (four) position.
_ X本^明在預先計算時，可輕易判斷構成具有與LSI 曰曰片之；丨面。卩的電容c共振之電感[之旁通導電路的配置、 Μ電體板的電率或對應於厚度之最合適尺寸等。 又，在製造步驟上，無論LSI晶片置於哪個位置，都可 2〇使上下之介電體輕易地重疊組合。 【圖式簡單說^明】 第1圖係說明天線與LSI晶片之匹配。 第2圖係說明習知之環形天線。 第3圖係說明本發明天線之構成原理。 15 1298139_ X 本 ^ Ming can be easily judged in the pre-calculation of the composition with the LSI 丨 丨;卩 Capacitance c Resonance inductance [the configuration of the bypass circuit, the electrical potential of the Μ electric plate or the most suitable size corresponding to the thickness. Further, in the manufacturing step, the upper and lower dielectric bodies can be easily overlapped and combined regardless of the position of the LSI wafer. [Simple diagram of the figure] Fig. 1 illustrates the matching of the antenna to the LSI chip. Figure 2 illustrates a conventional loop antenna. Fig. 3 is a view showing the constitution principle of the antenna of the present invention. 15 1298139
Rc...電阻Rc...resistance
1717