擦老太BBB擦BBB性视频,国内精品人妻无码久久久,6080yy午夜一二三区久久,狠狠人妻久久久久久综合九色91,国产一级a毛一级a看免费视频

RFID射頻識別介紹

摘要:隨著射頻識(shi)別技(ji)術(shu)的(de)(de)應(ying)用不斷(duan)擴大，越來(lai)越多的(de)(de)場(chang)合要(yao)求使用RFID射頻識(shi)別系統(tong)。RFID電(dian)(dian)子(zi)標(biao)簽(qian)天線(xian)作(zuo)為射頻識(shi)別系統(tong)中不可或缺的(de)(de)重要(yao)一環，其設計、生(sheng)產、測試等(deng)均是未(wei)來(lai)研究的(de)(de)主要(yao)內容之(zhi)一由于電(dian)(dian)磁波(bo)的(de)(de)固(gu)有(you)特性(xing)，在(zai)(zai)諸如(ru)臨近(jin)金屬、液體等(deng)環境中，RFID射頻識(shi)別系統(tong)的(de)(de)性(xing)能(neng)將大打折扣。在(zai)(zai)這(zhe)樣的(de)(de)環境中除(chu)了提高(gao)RFID電(dian)(dian)子(zi)標(biao)簽(qian)讀(du)寫器的(de)(de)性(xing)能(neng)之(zhi)外，RFID電(dian)(dian)子(zi)標(biao)簽(qian)天線(xian)的(de)(de)性(xing)能(neng)的(de)(de)提高(gao)更為重要(yao)。目(mu)(mu)前我(wo)們(men)正在(zai)(zai)針對RFID電(dian)(dian)子(zi)標(biao)簽(qian)天線(xian)在(zai)(zai)這(zhe)些復雜環境中的(de)(de)應(ying)用展開研究。另外，柔性(xing)RFID電(dian)(dian)子(zi)標(biao)簽(qian)貼(tie)附在(zai)(zai)非平坦表(biao)面時性(xing)能(neng)也(ye)(ye)會有(you)所惡化。如(ru)何避免柔性(xing)RFID電(dian)(dian)子(zi)標(biao)簽(qian)應(ying)用到非平坦表(biao)面帶來(lai)的(de)(de)影響也(ye)(ye)是目(mu)(mu)前我(wo)們(men)另一個研究重點。

        射(she)(she)頻(pin)(pin)識別(bie)(bie)技(ji)術是一(yi)(yi)(yi)種非(fei)接觸的(de)(de)自動(dong)(dong)識別(bie)(bie)技(ji)術。它(ta)是由電子標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)（Tag/Transponder）、讀(du)寫(xie)器(qi)(qi)（Reader/Interrogator）及(ji)中(zhong)(zhong)間件（Middle-Ware）~部分組(zu)成的(de)(de)一(yi)(yi)(yi)種短距(ju)離無線(xian)(xian)通(tong)信系統。射(she)(she)頻(pin)(pin)識別(bie)(bie)中(zhong)(zhong)的(de)(de)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)是射(she)(she)頻(pin)(pin)識別(bie)(bie)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)芯片(pian)(pian)和(he)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)的(de)(de)結合體。標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)根據其工(gong)作(zuo)模式(shi)不同而(er)分為(wei)主(zhu)動(dong)(dong)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)和(he)被(bei)動(dong)(dong)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)。主(zhu)動(dong)(dong)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)自身(shen)攜(xie)帶電池為(wei)其提供讀(du)寫(xie)器(qi)(qi)通(tong)信所需的(de)(de)能量：被(bei)動(dong)(dong)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)則采用感應(ying)(ying)耦合或反向散射(she)(she)工(gong)作(zuo)模式(shi)，即通(tong)過標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)從讀(du)寫(xie)器(qi)(qi)中(zhong)(zhong)發出的(de)(de)電磁(ci)(ci)場或者電磁(ci)(ci)波(bo)獲(huo)得(de)能量激活芯片(pian)(pian)，并(bing)調節(jie)射(she)(she)頻(pin)(pin)識別(bie)(bie)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)芯片(pian)(pian)與(yu)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)的(de)(de)匹配程(cheng)度(du)，將儲存(cun)在(zai)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)芯片(pian)(pian)中(zhong)(zhong)的(de)(de)信息反饋給讀(du)寫(xie)器(qi)(qi)。因此。射(she)(she)頻(pin)(pin)識別(bie)(bie)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)的(de)(de)阻抗(kang)必(bi)須與(yu)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)芯片(pian)(pian)的(de)(de)輸入阻抗(kang)共(gong)軛匹配，以使得(de)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)芯片(pian)(pian)能夠最(zui)大限度(du)地(di)獲(huo)得(de)射(she)(she)頻(pin)(pin)識別(bie)(bie)讀(du)寫(xie)器(qi)(qi)所發出的(de)(de)電磁(ci)(ci)能量。此外，標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)設(she)計時還必(bi)須考慮(lv)電子標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)所應(ying)(ying)用的(de)(de)場合，如(ru)應(ying)(ying)用在(zai)金屬物體表(biao)面的(de)(de)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)和(he)應(ying)(ying)用在(zai)普通(tong)物體表(biao)面的(de)(de)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)在(zai)天(tian)線(xian)(xian)的(de)(de)結構(gou)和(he)選材上存(cun)有(you)很大的(de)(de)差別(bie)(bie)。適(shi)合于(yu)多(duo)種芯片(pian)(pian)、低成本、多(duo)用途(tu)的(de)(de)標(biao)(biao)(biao)(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)(qian)(qian)天(tian)線(xian)(xian)是射(she)(she)頻(pin)(pin)識別(bie)(bie)在(zai)我國得(de)到廣泛普及(ji)的(de)(de)關鍵(jian)技(ji)術之(zhi)一(yi)(yi)(yi)。

RFID射頻識別系統(tong)與天線(xian)分類

   對于(yu)采用被動式(shi)標簽的射頻(pin)識別(bie)系統而言(yan)，根據工(gong)作頻(pin)段的不同具有兩(liang)種(zhong)(zhong)工(gong)作模式(shi)。一種(zhong)(zhong)是感應耦合(he)（Induc.tiveCoupling）T作模式(shi)，這種(zhong)(zhong)模式(shi)也(ye)稱(cheng)為(wei)近(jin)場(chang)工(gong)作模式(shi)，它主要適用用于(yu)低頻(pin)和(he)高頻(pin)RFID系統：另一種(zhong)(zhong)則是反向散射（Backscattering）32作模式(shi)，這種(zhong)(zhong)模式(shi)也(ye)稱(cheng)為(wei)遠場(chang)T作模式(shi)，主要適用于(yu)超高頻(pin)和(he)微波RFID系統。

    感應耦(ou)合模式主(zhu)要是指讀(du)(du)寫器(qi)天線和標(biao)(biao)(biao)(biao)簽(qian)(qian)天線都采用線圈形(xing)式。當讀(du)(du)寫器(qi)在閱(yue)讀(du)(du)標(biao)(biao)(biao)(biao)簽(qian)(qian)時(shi)，發(fa)出未(wei)經(jing)調(diao)制(zhi)(zhi)的(de)(de)(de)信號(hao)。處于讀(du)(du)寫器(qi)天線近(jin)場的(de)(de)(de)電(dian)子標(biao)(biao)(biao)(biao)簽(qian)(qian)天線接收到(dao)該信號(hao)并(bing)激活標(biao)(biao)(biao)(biao)簽(qian)(qian)芯片之后，由標(biao)(biao)(biao)(biao)簽(qian)(qian)芯片根(gen)據內(nei)部存儲的(de)(de)(de)全球(qiu)唯一的(de)(de)(de)識(shi)別號(hao)（ID）控制(zhi)(zhi)標(biao)(biao)(biao)(biao)簽(qian)(qian)天線中的(de)(de)(de)電(dian)流(liu)大小。這(zhe)個電(dian)流(liu)的(de)(de)(de)大小進一步(bu)增(zeng)強或者減小閱(yue)讀(du)(du)器(qi)天線發(fa)出的(de)(de)(de)磁場。這(zhe)時(shi)，讀(du)(du)寫器(qi)的(de)(de)(de)近(jin)場分量展現出被調(diao)制(zhi)(zhi)的(de)(de)(de)特性，讀(du)(du)寫器(qi)內(nei)部電(dian)路(lu)檢鋇0到(dao)這(zhe)個由于標(biao)(biao)(biao)(biao)簽(qian)(qian)而產生的(de)(de)(de)調(diao)制(zhi)(zhi)量并(bing)解調(diao)并(bing)得到(dao)標(biao)(biao)(biao)(biao)簽(qian)(qian)信息。

    在反向散射(she)T作(zuo)模式中，讀(du)寫器和電(dian)(dian)(dian)(dian)子(zi)(zi)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)之間采用(yong)(yong)電(dian)(dian)(dian)(dian)磁波(bo)來進(jin)行(xing)信(xin)息的(de)(de)(de)(de)傳輸。當(dang)讀(du)寫器對(dui)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)進(jin)行(xing)閱讀(du)識(shi)(shi)(shi)別時(shi)，首先發出(chu)未經調(diao)制(zhi)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)磁波(bo)，此時(shi)位于(yu)(yu)遠場的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)子(zi)(zi)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)天(tian)線(xian)接收(shou)(shou)到電(dian)(dian)(dian)(dian)磁波(bo)信(xin)號(hao)(hao)并(bing)(bing)在天(tian)線(xian)上產生感(gan)應電(dian)(dian)(dian)(dian)壓(ya)，電(dian)(dian)(dian)(dian)子(zi)(zi)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)內部電(dian)(dian)(dian)(dian)路(lu)將這(zhe)個(ge)感(gan)應電(dian)(dian)(dian)(dian)壓(ya)進(jin)行(xing)整流并(bing)(bing)放大(da)用(yong)(yong)于(yu)(yu)激(ji)(ji)活(huo)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)芯(xin)片。當(dang)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)芯(xin)片激(ji)(ji)活(huo)之后，用(yong)(yong)自身的(de)(de)(de)(de)全球唯(wei)一標(biao)(biao)(biao)(biao)(biao)識(shi)(shi)(shi)號(hao)(hao)對(dui)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)芯(xin)片阻抗(kang)(kang)進(jin)行(xing)變(bian)化，當(dang)電(dian)(dian)(dian)(dian)子(zi)(zi)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)芯(xin)片的(de)(de)(de)(de)阻抗(kang)(kang)和標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)芯(xin)片之間的(de)(de)(de)(de)阻抗(kang)(kang)匹(pi)配(pei)較好(hao)時(shi)則基(ji)本(ben)不反射(she)信(xin)號(hao)(hao)，而阻抗(kang)(kang)匹(pi)配(pei)不好(hao)時(shi)則將幾乎全部反射(she)信(xin)號(hao)(hao)。這(zhe)樣反射(she)信(xin)號(hao)(hao)就出(chu)現了振幅的(de)(de)(de)(de)變(bian)化，這(zhe)種情況類似于(yu)(yu)對(dui)反射(she)信(xin)號(hao)(hao)進(jin)行(xing)幅度調(diao)制(zhi)處(chu)理。讀(du)寫器通過(guo)接收(shou)(shou)到經過(guo)調(diao)制(zhi)的(de)(de)(de)(de)反射(she)信(xin)號(hao)(hao)判斷該電(dian)(dian)(dian)(dian)子(zi)(zi)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)的(de)(de)(de)(de)標(biao)(biao)(biao)(biao)(biao)識(shi)(shi)(shi)號(hao)(hao)并(bing)(bing)進(jin)行(xing)識(shi)(shi)(shi)別。這(zhe)類天(tian)線(xian)主要包(bao)括微帶天(tian)線(xian)、平面偶極子(zi)(zi)天(tian)線(xian)和環形天(tian)線(xian)。圖二是(shi)我(wo)們研制(zhi)的(de)(de)(de)(de)能(neng)工作(zuo)于(yu)(yu)多種識(shi)(shi)(shi)別環境(jing)下(xia)的(de)(de)(de)(de)UHF電(dian)(dian)(dian)(dian)子(zi)(zi)標(biao)(biao)(biao)(biao)(biao)簽(qian)(qian)(qian)天(tian)線(xian)。

RFID電(dian)子標簽(qian)天線的(de)設(she)計與測試

    如(ru)前所述，作于(yu)低頻(pin)與高頻(pin)的射頻(pin)識別(bie)(bie)系(xi)統采(cai)用感應耦合模式進行通信，所以T作于(yu)這(zhe)(zhe)兩個(ge)頻(pin)段的讀(du)寫(xie)器與電子(zi)標簽都(dou)采(cai)用線圈形式的天線。T作在(zai)這(zhe)(zhe)兩個(ge)頻(pin)段的射頻(pin)識別(bie)(bie)系(xi)統都(dou)受制于(yu)近(jin)場作用的范(fan)圍(wei)，從而導致(zhi)其(qi)識別(bie)(bie)距離(li)較短。根據目前的情況(kuang)來看(kan)，采(cai)用近(jin)場通信的射頻(pin)識別(bie)(bie)系(xi)統最大的識別(bie)(bie)距離(li)小于(yu)1米。

由于低頻和高頻頻段的射頻識別系(xi)統采用的是電磁(ci)場(chang)耦合模(mo)式(shi)，所以(yi)系(xi)統中的天線(xian)都采用線(xian)圈(quan)形式(shi)。采用這(zhe)種(zhong)形式(shi)的主要原因如下(xia)：

　　1.電磁(ci)場的(de)耦合在線圈之間比較緊密(mi)：

　　2.天(tian)線(xian)采用線(xian)圈的(de)形(xing)式進(jin)一步減(jian)(jian)小了天(tian)線(xian)的(de)體(ti)積(ji)進(jin)而(er)減(jian)(jian)小了標簽的(de)體(ti)積(ji)：

　　3.標(biao)簽芯片的特性(xing)要求標(biao)簽天線具有一定的電抗。

    在超高頻(pin)和(he)(he)(he)微(wei)波波段(duan)時(shi)，電(dian)(dian)子標(biao)(biao)簽(qian)和(he)(he)(he)讀(du)寫器之(zhi)間的(de)(de)(de)通(tong)信采(cai)用反向散射(she)工(gong)作(zuo)(zuo)方式。這時(shi)候(hou)，連接(jie)電(dian)(dian)子標(biao)(biao)簽(qian)和(he)(he)(he)讀(du)寫器之(zhi)間的(de)(de)(de)橋(qiao)梁不再是(shi)近磁場而(er)是(shi)電(dian)(dian)磁波。此時(shi)，被(bei)動型電(dian)(dian)子標(biao)(biao)簽(qian)處(chu)于讀(du)寫器的(de)(de)(de)電(dian)(dian)磁波遠場中。根據頻(pin)帶的(de)(de)(de)波長(chang)和(he)(he)(he)天線的(de)(de)(de)口徑可以計算出該頻(pin)帶內(nei)射(she)頻(pin)識別(bie)(bie)系統的(de)(de)(de)遠場和(he)(he)(he)讀(du)寫器之(zhi)間的(de)(de)(de)距離(li)。一般來(lai)說，被(bei)動性標(biao)(biao)簽(qian)在超高頻(pin)范(fan)圍內(nei)的(de)(de)(de)丁作(zuo)(zuo)距離(li)可達(da)10米左有(you)，根據現有(you)資料來(lai)看。工(gong)作(zuo)(zuo)于微(wei)波波段(duan)（主(zhu)要(yao)指2.45GHz）的(de)(de)(de)被(bei)動標(biao)(biao)簽(qian)工(gong)作(zuo)(zuo)距離(li)僅為(wei)1米左右。所以目(mu)前(qian)采(cai)用反向散射(she)下作(zuo)(zuo)模式的(de)(de)(de)射(she)頻(pin)識別(bie)(bie)系統主(zhu)要(yao)使(shi)用位于860～960MHz的(de)(de)(de)超高頻(pin)頻(pin)段(duan)。

相關解決(jue)方案：RFID技術(shu)在醫療耗材管理中的(de)應用(yong)介(jie)紹

相關解決方案(an)：RFID高值耗材柜(ju)(ju)/藥(yao)品零售柜(ju)(ju)管理系統

    在由被(bei)動型標簽天線(xian)組成的射頻識別系統(tong)中(zhong)(zhong)，標簽需(xu)(xu)要從瀆(du)寫器產生(sheng)的電(dian)(dian)(dian)(dian)磁(ci)(ci)場或者(zhe)(zhe)電(dian)(dian)(dian)(dian)磁(ci)(ci)波中(zhong)(zhong)獲取能量激活標簽芯(xin)片(pian)(pian)。所以在電(dian)(dian)(dian)(dian)子(zi)標簽中(zhong)(zhong)有一部(bu)分(fen)電(dian)(dian)(dian)(dian)路(lu)專門用(yong)于檢測標簽天線(xian)上(shang)的感生(sheng)電(dian)(dian)(dian)(dian)動勢或者(zhe)(zhe)感應電(dian)(dian)(dian)(dian)壓，并通(tong)過二極管電(dian)(dian)(dian)(dian)路(lu)進行整流并經(jing)過其他電(dian)(dian)(dian)(dian)路(lu)進行電(dian)(dian)(dian)(dian)壓放大(da)等等。這些(xie)電(dian)(dian)(dian)(dian)路(lu)被(bei)集(ji)成存標簽芯(xin)片(pian)(pian)內部(bu)。當(dang)芯(xin)片(pian)(pian)進行封(feng)裝時通(tong)常還會引入一部(bu)分(fen)分(fen)布式電(dian)(dian)(dian)(dian)容(rong)。但是，天線(xian)設(she)計本身并不需(xu)(xu)要知道(dao)芯(xin)片(pian)(pian)中(zhong)(zhong)的具體(ti)電(dian)(dian)(dian)(dian)路(lu)而只需(xu)(xu)要掌握芯(xin)片(pian)(pian)和經(jing)過封(feng)裝之后(hou)的芯(xin)片(pian)(pian)阻抗，并利用(yong)最大(da)能量傳遞的法則設(she)計天線(xian)的輸入阻抗。

    由于(yu)電(dian)子標(biao)簽(qian)芯片(pian)(pian)的輸出阻(zu)(zu)抗(kang)具有電(dian)抗(kang)分(fen)量(liang)，為(wei)了達(da)到能量(liang)的最大傳遞，需(xu)要將天線(xian)的輸入阻(zu)(zu)抗(kang)設(she)計為(wei)標(biao)簽(qian)芯片(pian)(pian)阻(zu)(zu)抗(kang)的共軛(e)。一(yi)般而言(yan)，電(dian)子標(biao)簽(qian)芯片(pian)(pian)的輸入阻(zu)(zu)抗(kang)為(wei)Z=R_X形(xing)(xing)式。為(wei)了獲(huo)得共軛(e)形(xing)(xing)式的阻(zu)(zu)抗(kang)，電(dian)子標(biao)簽(qian)天線(xian)的阻(zu)(zu)抗(kang)應為(wei)Z=R+iX形(xing)(xing)式。

    如前文所(suo)述，工(gong)作在低頻與高頻的(de)射頻識別系統中的(de)被動標簽天線采用(yong)了線圈形(xing)式(shi)，這(zhe)種線圈形(xing)式(shi)即(ji)可引入感抗用(yong)于抵消等效(xiao)電路中的(de)容(rong)抗從而實現標簽芯片和天線之間(jian)的(de)最大能量傳遞。

而(er)對于(yu)T作于(yu)超高(gao)頻和微波頻段的(de)(de)標(biao)簽天線(xian)而(er)言(yan)，為(wei)了(le)引入(ru)感抗以抵(di)消芯片(pian)的(de)(de)容(rong)抗，需要(yao)在天線(xian)設計中加(jia)入(ru)環(huan)形結(jie)(jie)構進行感性饋電，或者加(jia)入(ru)T型(xing)配(pei)『31等結(jie)(jie)構。另外，為(wei)了(le)在規定的(de)(de)等效(xiao)全向輻(fu)射功(gong)率（EIRP）下獲得更遠的(de)(de)閱讀距(ju)離(li)除了(le)要(yao)求(qiu)電子(zi)標(biao)簽天線(xian)也具有高(gao)增益。還要(yao)求(qiu)電子(zi)標(biao)簽天線(xian)和標(biao)簽芯片(pian)之間能夠(gou)有足夠(gou)的(de)(de)匹配(pei)。

    在(zai)標(biao)(biao)簽(qian)(qian)天(tian)(tian)(tian)線(xian)(xian)(xian)進行設計和(he)仿(fang)真(zhen)并獲(huo)得(de)理(li)想結果之后，需(xu)要將天(tian)(tian)(tian)線(xian)(xian)(xian)加工并進行測(ce)(ce)(ce)試(shi)(shi)以驗證設計和(he)仿(fang)真(zhen)的(de)(de)(de)(de)正確性(xing)。也(ye)正兇為前(qian)文中所(suo)介紹的(de)(de)(de)(de)標(biao)(biao)簽(qian)(qian)天(tian)(tian)(tian)線(xian)(xian)(xian)具(ju)有(you)復數(shu)阻(zu)(zu)(zu)抗(kang)(kang)的(de)(de)(de)(de)特性(xing)，其(qi)測(ce)(ce)(ce)試(shi)(shi)方(fang)法和(he)具(ju)有(you)實數(shu)阻(zu)(zu)(zu)抗(kang)(kang)天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)測(ce)(ce)(ce)試(shi)(shi)方(fang)法有(you)所(suo)區別。另外，在(zai)同一(yi)個標(biao)(biao)簽(qian)(qian)天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)測(ce)(ce)(ce)試(shi)(shi)過程巾，根據(ju)所(suo)需(xu)數(shu)據(ju)的(de)(de)(de)(de)不(bu)(bu)(bu)同其(qi)測(ce)(ce)(ce)試(shi)(shi)方(fang)法也(ye)有(you)所(suo)不(bu)(bu)(bu)同通(tong)常(chang)測(ce)(ce)(ce)試(shi)(shi)天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)過程中并不(bu)(bu)(bu)需(xu)要專(zhuan)門(men)測(ce)(ce)(ce)試(shi)(shi)天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)輸入(ru)阻(zu)(zu)(zu)抗(kang)(kang)。但標(biao)(biao)簽(qian)(qian)天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)為負數(shu)阻(zu)(zu)(zu)抗(kang)(kang)，且其(qi)虛部與(yu)實部之比較(jiao)大（通(tong)常(chang)X/R》10），這(zhe)樣(yang)的(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)曲線(xian)(xian)(xian)在(zai)smith 圓(yuan)圖中靠(kao)近短(duan)路圓(yuan)不(bu)(bu)(bu)易通(tong)過smith網圖觀察天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)帶寬。為了獲(huo)得(de)標(biao)(biao)簽(qian)(qian)天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)輸入(ru)阻(zu)(zu)(zu)抗(kang)(kang)。可以將測(ce)(ce)(ce)試(shi)(shi)設備(bei)的(de)(de)(de)(de)輸出端口(kou)直(zhi)接(jie)與(yu)天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)輸入(ru)端口(kou)相(xiang)連由于這(zhe)種方(fang)式并未考慮標(biao)(biao)簽(qian)(qian)天(tian)(tian)(tian)線(xian)(xian)(xian)本身具(ju)有(you)復數(shu)阻(zu)(zu)(zu)抗(kang)(kang)這(zhe)一(yi)特性(xing)。天(tian)(tian)(tian)線(xian)(xian)(xian)和(he)測(ce)(ce)(ce)試(shi)(shi)設備(bei)之間(jian)并沒(mei)有(you)取得(de)共軛匹配，此時(shi)只(zhi)能得(de)到天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)參(can)數(shu)，諸如散(san)射(she)矩陣參(can)數(shu)和(he)駐波比等常(chang)用(yong)來衡量天(tian)(tian)(tian)線(xian)(xian)(xian)的(de)(de)(de)(de)電路參(can)數(shu)不(bu)(bu)(bu)能直(zhi)接(jie)獲(huo)得(de)。

RFID電力(li)行業安全工器具管理柜介紹

相關(guan)解(jie)決(jue)方案：RFID圖書管理(li)解(jie)決(jue)方案

    為了獲得(de)(de)是散(san)射參數(shu)和駐波比(bi)等電(dian)(dian)路(lu)參數(shu)，以便(bian)對(dui)天(tian)線的阻抗帶寬(kuan)特性進行(xing)評價，可(ke)(ke)將實測的阻抗參數(shu)帶入(ru)相(xiang)關公(gong)式進行(xing)計(ji)算或者采用(yong)(yong)阻抗匹(pi)(pi)配(pei)(pei)(pei)的方(fang)法(fa)(fa)在測試(shi)設備(bei)和天(tian)線之間(jian)加入(ru)匹(pi)(pi)配(pei)(pei)(pei)電(dian)(dian)路(lu)。匹(pi)(pi)配(pei)(pei)(pei)電(dian)(dian)路(lu)可(ke)(ke)用(yong)(yong)兩種方(fang)法(fa)(fa)構成，一是采用(yong)(yong)工作頻率較高的分立元(yuan)件構成，二是采用(yong)(yong)微波電(dian)(dian)路(lu)構成。需要注意的是配(pei)(pei)(pei)電(dian)(dian)路(lu)應(ying)該距離天(tian)線端口(kou)足夠近。這樣才(cai)能獲得(de)(de)較大的帶寬(kuan)并避免(mian)天(tian)線和配(pei)(pei)(pei)電(dian)(dian)路(lu)之間(jian)的連接(jie)線路(lu)帶來的負面影響。

電(dian)路用(yong)于(yu)RFID標簽天線的測試。不(bu)過(guo)采(cai)用(yong)匹配(pei)電(dian)路具有(you)一些(xie)缺點：

　　l.不論使用(yong)分立元件還是使用(yong)微波電(dian)(dian)(dian)路(lu)來構成阻(zu)抗配(pei)電(dian)(dian)(dian)路(lu)，其帶(dai)(dai)寬(kuan)總是受(shou)限的(de)(de)(de)，當天線真(zhen)實帶(dai)(dai)寬(kuan)大于(yu)配(pei)電(dian)(dian)(dian)路(lu)的(de)(de)(de)帶(dai)(dai)寬(kuan)時，所(suo)測試到的(de)(de)(de)帶(dai)(dai)寬(kuan)將不再(zai)準確(que);

　　2.南(nan)于配(pei)電(dian)路總是存在損(sun)耗，所以測試(shi)得(de)到的(de)帶寬和回(hui)波(bo)損(sun)耗值等參數和真實的(de)天線參數有一些差(cha)別;

　　3.引入的配電路(lu)總是和天線(xian)之間存在距離，從而使得測試(shi)現(xian)一定誤差。

    采上述使(shi)用(yong)匹配電(dian)路(lu)進行測試(shi)的方案(an)除了可(ke)以(yi)獲得一定精度的帶寬和同波(bo)損耗(hao)等(deng)參數之外，對于(yu)測試(shi)天線的方向圖和增益(yi)等(deng)輻射(she)特(te)性也(ye)是必須的。只有通(tong)過阻抗配電(dian)路(lu)才能將天線接收到的絕大(da)部(bu)分能量基本無反射(she)地(di)傳遞到測試(shi)系統中，從而測試(shi)相應的輻射(she)參數。

相關RFID產品介紹：

RFID超(chao)高(gao)(gao)(gao)頻（UHF）安卓（Android 11.0(不定期升級(ji))）手持機(ji)MT50A搭載八核2.0GHz高(gao)(gao)(gao)性能(neng)處理(li)器，結(jie)合安卓Android 11.0(不定期升級(ji))系統， 配備3GB RAM + 32GB ROM內存，以及5.5寸(cun)IPS高(gao)(gao)(gao)亮屏，選(xuan)配條(tiao)碼(一維(wei)或二(er)維(wei))，RFID低頻(125KHz)，高(gao)(gao)(gao)頻(13.56MHz)，超(chao)高(gao)(gao)(gao)頻(860MHz-960MHz)高(gao)(gao)(gao)性能(neng)模塊。6面均(jun)可承受1.5米(mi)高(gao)(gao)(gao)度跌落到水泥地面的沖(chong)擊(ji)，IP等級(ji)可達IP65。可廣泛(fan)應(ying)用于物流(liu)快遞、設備巡檢、資產管理(li)、醫(yi)療護理(li)、防(fang)偽(wei)溯源、產品(pin)質檢、水電抄表(biao)、服裝訂貨、移動銷售作(zuo)業等多種無線(xian)射頻識(shi)別（RFID）系統。

RFID高頻HF新(xin)零(ling)售(shou)售(shou)貨柜(ju)讀寫器HR7768，是(shi)一款(kuan)高性能(neng)的ISO/IEC15693、ISO18000-3 Mode1協(xie)議電子標簽(qian)讀寫器，支(zhi)持24路天(tian)線接口，采用全(quan)新(xin)智(zhi)能(neng)信(xin)號(hao)處理設計(ji)，射頻輸出功率0.5-5W可軟(ruan)件調節。廣泛用于新(xin)零(ling)售(shou)無人售(shou)貨柜(ju)，智(zhi)能(neng)圖書柜(ju)、試管(guan)(guan)(guan)試劑管(guan)(guan)(guan)理、機要(yao)文件管(guan)(guan)(guan)理、流(liu)利架、智(zhi)能(neng)檔案(an)柜(ju)、藥品寄售(shou)柜(ju)、智(zhi)能(neng)文件柜(ju)、商品定位、珠(zhu)寶管(guan)(guan)(guan)理、自(zi)助洗衣服務(wu)、生產過程控制等RFID系統(tong)應(ying)用領域(yu)。

RFID高(gao)頻大功(gong)率(lv)機(ji)要(yao)文件管(guan)理(li)讀寫(xie)器(qi)HR9886，是(shi)一款(kuan)高(gao)性能的ISO/IEC 15693、ISO18000-3協議電子標(biao)簽(qian)讀寫(xie)器(qi)，工作頻率(lv)13.56MHz，輸出功(gong)率(lv)可達4W，支(zhi)持16路SMA接口天線。可廣泛用(yong)于(yu)機(ji)要(yao)文件管(guan)理(li)、珠寶管(guan)理(li)、藥品監控(kong)、圖書管(guan)理(li)、商(shang)品定位、物流(liu)管(guan)理(li)、個人身份識(shi)別、會議簽(qian)到管(guan)理(li)、開放式門禁考勤、防(fang)偽(wei)、自助(zhu)洗衣(yi)服務(wu)、生產過程控(kong)制等(deng)諸(zhu)多(duo)RFID系統應用(yong)領(ling)域。

RFID高頻(pin)HF（13.56MHz）天線調(diao)諧板HA60XX，是(shi)一款(kuan)高性能(neng)的電(dian)子(zi)標簽(qian)讀(du)寫器天線調(diao)諧板，方便根(gen)據客戶的尺(chi)寸要求(qiu)(qiu)以及現(xian)場環境要求(qiu)(qiu)調(diao)制(zhi)標準(zhun)的13.56MHz天線，適用于搭(da)配我司模擬信號讀(du)寫器使用，可廣(guang)泛應用于工業控制(zhi)、圖(tu)書管(guan)(guan)理(li)(li)(li)、自助借還書機、餐飲(yin)管(guan)(guan)理(li)(li)(li)(智盤)、體育競賽、珠(zhu)寶管(guan)(guan)理(li)(li)(li)、動物(wu)畜牧業管(guan)(guan)理(li)(li)(li)、物(wu)流分揀、個人身份(fen)識別、門(men)禁系(xi)統、檔案管(guan)(guan)理(li)(li)(li)、、防(fang)偽系(xi)統等多(duo)種需要訂(ding)制(zhi)天線的無(wu)線射頻(pin)自動識別（RFID）系(xi)統。

RFID射頻(pin)識別結語

隨著(zhu)RFID射(she)頻識別(bie)(bie)技術的(de)(de)(de)應(ying)用(yong)不斷擴(kuo)大(da)，越(yue)來越(yue)多的(de)(de)(de)場合要(yao)求使用(yong)RFID射(she)頻識別(bie)(bie)系統。RFID電子(zi)(zi)(zi)標(biao)(biao)簽(qian)天(tian)線作為射(she)頻識別(bie)(bie)系統中不可或缺(que)的(de)(de)(de)重要(yao)一環，其設計、生產、測試等(deng)均(jun)是未來研(yan)(yan)究(jiu)的(de)(de)(de)主要(yao)內容之一由(you)于電磁波的(de)(de)(de)固有(you)特性(xing)(xing)(xing)，在諸如臨近(jin)金屬、液體等(deng)環境中，RFID射(she)頻識別(bie)(bie)系統的(de)(de)(de)性(xing)(xing)(xing)能將大(da)打折扣。在這樣的(de)(de)(de)環境中除了(le)提(ti)高(gao)RFID電子(zi)(zi)(zi)標(biao)(biao)簽(qian)讀寫器的(de)(de)(de)性(xing)(xing)(xing)能之外，RFID電子(zi)(zi)(zi)標(biao)(biao)簽(qian)天(tian)線的(de)(de)(de)性(xing)(xing)(xing)能的(de)(de)(de)提(ti)高(gao)更為重要(yao)。目(mu)前我(wo)們正在針對RFID電子(zi)(zi)(zi)標(biao)(biao)簽(qian)天(tian)線在這些復(fu)雜環境中的(de)(de)(de)應(ying)用(yong)展開(kai)研(yan)(yan)究(jiu)。另外，柔性(xing)(xing)(xing)RFID電子(zi)(zi)(zi)標(biao)(biao)簽(qian)貼附在非(fei)平坦表(biao)(biao)面時性(xing)(xing)(xing)能也(ye)(ye)會有(you)所惡化。如何(he)避免柔性(xing)(xing)(xing)RFID電子(zi)(zi)(zi)標(biao)(biao)簽(qian)應(ying)用(yong)到非(fei)平坦表(biao)(biao)面帶來的(de)(de)(de)影(ying)響也(ye)(ye)是目(mu)前我(wo)們另一個(ge)研(yan)(yan)究(jiu)重點。

請繼續瀏(liu)覽相關(guan)產品與解決方案，或點擊右邊下載：