磁環/磁珠在(zai)不同(tong)的(de)(de)(de)(de)(de)頻(pin)率下(xia)有(you)不同(tong)的(de)(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)特(te)性，一(yi)(yi)般(ban)在(zai)低(di)(di)頻(pin)時(shi)(shi)阻(zu)(zu)(zu)抗(kang)(kang)很(hen)(hen)小，當信號(hao)(hao)(hao)(hao)頻(pin)率升高(gao)(gao)(gao)磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)表(biao)(biao)現的(de)(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)急劇升高(gao)(gao)(gao)。大家都知道，信號(hao)(hao)(hao)(hao)頻(pin)率越高(gao)(gao)(gao)，越容易輻(fu)射(she)出去（要買優質的(de)(de)(de)(de)(de)電(dian)(dian)腦機(ji)箱(xiang)(xiang)也是(shi)要減小電(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)泄(xie)漏）那么(me)在(zai)磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)/磁(ci)(ci)(ci)(ci)(ci)珠作(zuo)用(yong)(yong)(yong)下(xia)，使(shi)正(zheng)常(chang)有(you)用(yong)(yong)(yong)的(de)(de)(de)(de)(de)信號(hao)(hao)(hao)(hao)很(hen)(hen)好(hao)的(de)(de)(de)(de)(de)通過，又(you)能很(hen)(hen)好(hao)的(de)(de)(de)(de)(de)抑(yi)(yi)制高(gao)(gao)(gao)頻(pin)干擾(rao)(rao)信號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)通過，而且利息低(di)(di)廉。所(suo)以大家在(zai)顯示器信號(hao)(hao)(hao)(hao)線， USB 連(lian)接(jie)線，甚至高(gao)(gao)(gao)檔鍵盤、鼠標上看(kan)的(de)(de)(de)(de)(de)塑料疙(ge)瘩型的(de)(de)(de)(de)(de)一(yi)(yi)體式磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)就不足為(wei)奇了。為(wei)了提高(gao)(gao)(gao)磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)/磁(ci)(ci)(ci)(ci)(ci)珠傳輸速率及穩定性，也為(wei)了減小傳輸線在(zai)傳送數據時(shi)(shi)對其他(ta)設備，如(ru)聲(sheng)卡的(de)(de)(de)(de)(de)干擾(rao)(rao)，設計(ji)了靜電(dian)(dian)屏(ping)蔽(bi)層(ceng)。這(zhe)(zhe)個(ge)屏(ping)蔽(bi)層(ceng)是(shi)由一(yi)(yi)個(ge)較薄(bo)的(de)(de)(de)(de)(de)金屬箔片或者是(shi)多股細銅絲編織成(cheng)(cheng)(cheng)網(wang)狀做成(cheng)(cheng)(cheng)，應用(yong)(yong)(yong)的(de)(de)(de)(de)(de)是(shi)靜電(dian)(dian)場(chang)的(de)(de)(de)(de)(de)表(biao)(biao)面(mian)效(xiao)應原(yuan)理。也就是(shi)將(jiang)數據傳送線的(de)(de)(de)(de)(de)外表(biao)(biao)面(mian)包上一(yi)(yi)層(ceng)金屬膜，并將(jiang)這(zhe)(zhe)個(ge)屏(ping)蔽(bi)層(ceng)與(yu)機(ji)箱(xiang)(xiang)進行接(jie)地(di)，就可以很(hen)(hen)好(hao)地(di)將(jiang)數據線與(yu)空間干擾(rao)(rao)信號(hao)(hao)(hao)(hao)隔離(li)！吸收磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)，又(you)稱(cheng)鐵(tie)氧體磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)，常(chang)用(yong)(yong)(yong)于(yu)可拆卸的(de)(de)(de)(de)(de)分離(li)時(shi)(shi)磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)，它(ta)是(shi)電(dian)(dian)子電(dian)(dian)路中(zhong)常(chang)用(yong)(yong)(yong)的(de)(de)(de)(de)(de)抗(kang)(kang)干擾(rao)(rao)元件，對于(yu)高(gao)(gao)(gao)頻(pin)噪(zao)聲(sheng)有(you)很(hen)(hen)好(hao)的(de)(de)(de)(de)(de)抑(yi)(yi)制作(zuo)用(yong)(yong)(yong)，一(yi)(yi)般(ban)使(shi)用(yong)(yong)(yong)鐵(tie)氧體材料(Mn-Zn)制成(cheng)(cheng)(cheng)。磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)在(zai)不同(tong)的(de)(de)(de)(de)(de)頻(pin)率下(xia)有(you)不同(tong)的(de)(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)特(te)性，一(yi)(yi)般(ban)在(zai)低(di)(di)頻(pin)時(shi)(shi)阻(zu)(zu)(zu)抗(kang)(kang)很(hen)(hen)小，當信號(hao)(hao)(hao)(hao)頻(pin)率升高(gao)(gao)(gao)磁(ci)(ci)(ci)(ci)(ci)環(huan)(huan)(huan)(huan)表(biao)(biao)現的(de)(de)(de)(de)(de)阻(zu)(zu)(zu)抗(kang)(kang)急劇升高(gao)(gao)(gao)。使(shi)正(zheng)常(chang)有(you)用(yong)(yong)(yong)的(de)(de)(de)(de)(de)信號(hao)(hao)(hao)(hao)很(hen)(hen)好(hao)的(de)(de)(de)(de)(de)通過，又(you)能很(hen)(hen)好(hao)的(de)(de)(de)(de)(de)抑(yi)(yi)制高(gao)(gao)(gao)頻(pin)干擾(rao)(rao)信號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)通過，而且成(cheng)(cheng)(cheng)本低(di)(di)廉。

磁珠的作用：主(zhu)要(yao)是(shi)消除(chu)存在(zai)于傳輸線結構（電(dian)(dian)(dian)路(lu)）中的(de)RF噪聲(sheng)，RF能(neng)(neng)(neng)量是(shi)疊加在(zai)直流(liu)傳輸電(dian)(dian)(dian)平上(shang)(shang)的(de)交流(liu)正弦波成分，直流(liu)成分是(shi)需(xu)要(yao)的(de)有用(yong)信號，而(er)(er)射頻(pin)(pin)RF能(neng)(neng)(neng)量卻(que)是(shi)無用(yong)的(de)電(dian)(dian)(dian)磁(ci)(ci)(ci)干擾沿著線路(lu)傳輸和(he)(he)輻射（EMI）。要(yao)消除(chu)這些不需(xu)要(yao)的(de)信號能(neng)(neng)(neng)量。磁(ci)(ci)(ci)珠(zhu)抑(yi)制(zhi)信號線、電(dian)(dian)(dian)源線上(shang)(shang)的(de)高(gao)(gao)頻(pin)(pin)噪聲(sheng)和(he)(he)尖峰干擾，還(huan)具有吸收靜電(dian)(dian)(dian)脈沖的(de)能(neng)(neng)(neng)力。磁(ci)(ci)(ci)珠(zhu)是(shi)用(yong)來吸收超高(gao)(gao)頻(pin)(pin)信號，像(xiang)一(yi)些RF電(dian)(dian)(dian)路(lu)，PLL，振蕩(dang)電(dian)(dian)(dian)路(lu)，含超高(gao)(gao)頻(pin)(pin)存儲器電(dian)(dian)(dian)路(lu)（DDRSDRAM，RAMBUS等(deng)）都需(xu)要(yao)在(zai)電(dian)(dian)(dian)源輸入部分加磁(ci)(ci)(ci)珠(zhu)，而(er)(er)電(dian)(dian)(dian)感(gan)是(shi)一(yi)種蓄能(neng)(neng)(neng)元(yuan)件，用(yong)在(zai)LC振蕩(dang)電(dian)(dian)(dian)路(lu)，中低頻(pin)(pin)的(de)濾波電(dian)(dian)(dian)路(lu)等(deng)，其應用(yong)頻(pin)(pin)率(lv)范圍很少超過(guo)50MHZ。 磁(ci)(ci)(ci)珠(zhu)有很高(gao)(gao)的(de)電(dian)(dian)(dian)阻(zu)率(lv)和(he)(he)磁(ci)(ci)(ci)導率(lv)，等(deng)效于電(dian)(dian)(dian)阻(zu)和(he)(he)電(dian)(dian)(dian)感(gan)串聯，但電(dian)(dian)(dian)阻(zu)值(zhi)和(he)(he)電(dian)(dian)(dian)感(gan)值(zhi)都隨頻(pin)(pin)率(lv)變化(hua)。磁(ci)(ci)(ci)珠(zhu)參數規格

磁珠和電感的區別：電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)是(shi)(shi)儲能(neng)元件，而(er)(er)磁(ci)(ci)珠(zhu)(zhu)是(shi)(shi)能(neng)量轉(zhuan)換(huan)（消耗）器(qi)(qi)件。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)多用(yong)(yong)(yong)(yong)于(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源濾(lv)波回(hui)路(lu)(lu)，磁(ci)(ci)珠(zhu)(zhu)多用(yong)(yong)(yong)(yong)于(yu)(yu)信(xin)號回(hui)路(lu)(lu)，用(yong)(yong)(yong)(yong)于(yu)(yu)EMC對策磁(ci)(ci)珠(zhu)(zhu)主要用(yong)(yong)(yong)(yong)于(yu)(yu)抑(yi)制(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)輻(fu)射干(gan)擾(rao)，而(er)(er)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)用(yong)(yong)(yong)(yong)于(yu)(yu)這(zhe)方面(mian)則(ze)側重于(yu)(yu)抑(yi)制(zhi)傳(chuan)(chuan)導性干(gan)擾(rao)。兩者(zhe)都可(ke)用(yong)(yong)(yong)(yong)于(yu)(yu)處理EMC、EMI問題。磁(ci)(ci)珠(zhu)(zhu)是(shi)(shi)用(yong)(yong)(yong)(yong)來(lai)吸(xi)收超(chao)高頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)號，象(xiang)一些RF電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，PLL，振(zhen)蕩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，含超(chao)高頻(pin)(pin)(pin)(pin)(pin)(pin)存儲器(qi)(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)（DDR SDRAM，RAMBUS等(deng)(deng)(deng)）都需要在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源輸入部(bu)分加磁(ci)(ci)珠(zhu)(zhu)，而(er)(er)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)是(shi)(shi)一種蓄能(neng)元件，用(yong)(yong)(yong)(yong)在(zai)LC振(zhen)蕩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)，中低頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)濾(lv)波電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)等(deng)(deng)(deng)，其應(ying)用(yong)(yong)(yong)(yong)頻(pin)(pin)(pin)(pin)(pin)(pin)率范(fan)圍(wei)很少超(chao)過錯50MHZ。地(di)(di)(di)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)連接一般用(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)連接也用(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)，而(er)(er)對信(xin)號線(xian)(xian)(xian)(xian)(xian)(xian)則(ze)采(cai)用(yong)(yong)(yong)(yong)磁(ci)(ci)珠(zhu)(zhu)？ 但實際上磁(ci)(ci)珠(zhu)(zhu)應(ying)該也能(neng)達到吸(xi)收高頻(pin)(pin)(pin)(pin)(pin)(pin)干(gan)擾(rao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)目(mu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)啊？而(er)(er)且電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)在(zai)高頻(pin)(pin)(pin)(pin)(pin)(pin)諧振(zhen)以(yi)(yi)后(hou)都不(bu)(bu)能(neng)再起電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)作用(yong)(yong)(yong)(yong)了,先必(bi)需明白(bai)EMI的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)兩個(ge)途(tu)徑，即：輻(fu)射和(he)(he)傳(chuan)(chuan)導，不(bu)(bu)同的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)途(tu)徑采(cai)用(yong)(yong)(yong)(yong)不(bu)(bu)同的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)抑(yi)制(zhi)方法。前者(zhe)用(yong)(yong)(yong)(yong)磁(ci)(ci)珠(zhu)(zhu)，后(hou)者(zhe)用(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)。對于(yu)(yu)扳子(zi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)IO部(bu)分，是(shi)(shi)不(bu)(bu)是(shi)(shi)基于(yu)(yu)EMC的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)目(mu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)可(ke)以(yi)(yi)用(yong)(yong)(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)將IO部(bu)分和(he)(he)扳子(zi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)地(di)(di)(di)進(jin)行(xing)隔離，比(bi)如(ru)將USB的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)地(di)(di)(di)和(he)(he)扳子(zi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)地(di)(di)(di)用(yong)(yong)(yong)(yong)10uH的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)隔離可(ke)以(yi)(yi)防止插拔的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)噪(zao)聲干(gan)擾(rao)地(di)(di)(di)平面(mian)？電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)一般用(yong)(yong)(yong)(yong)于(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)匹配和(he)(he)信(xin)號質量的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)控制(zhi)上。在(zai)模擬(ni)地(di)(di)(di)和(he)(he)數字地(di)(di)(di)結合的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)地(di)(di)(di)方用(yong)(yong)(yong)(yong)磁(ci)(ci)珠(zhu)(zhu)。在(zai)模擬(ni)地(di)(di)(di)和(he)(he)數字地(di)(di)(di)結合的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)地(di)(di)(di)方用(yong)(yong)(yong)(yong)磁(ci)(ci)珠(zhu)(zhu)。數字地(di)(di)(di)和(he)(he)模擬(ni)地(di)(di)(di)之間的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)磁(ci)(ci)珠(zhu)(zhu)用(yong)(yong)(yong)(yong)多大(da),磁(ci)(ci)珠(zhu)(zhu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)大(da)小（確切(qie)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)說應(ying)該是(shi)(shi)磁(ci)(ci)珠(zhu)(zhu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)特性曲(qu)線(xian)(xian)(xian)(xian)(xian)(xian)),取決于(yu)(yu)你(ni)需要磁(ci)(ci)珠(zhu)(zhu)吸(xi)收的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)干(gan)擾(rao)波的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)頻(pin)(pin)(pin)(pin)(pin)(pin)率,為(wei)什(shen)么磁(ci)(ci)珠(zhu)(zhu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)單位和(he)(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)是(shi)(shi)一樣的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)呢？都是(shi)(shi)歐(ou)姆(mu)(mu)！！磁(ci)(ci)珠(zhu)(zhu)就(jiu)是(shi)(shi)阻(zu)(zu)高頻(pin)(pin)(pin)(pin)(pin)(pin)嘛(ma)，對直(zhi)流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)低，對高頻(pin)(pin)(pin)(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)高，不(bu)(bu)就(jiu)好理解了嗎(ma)， 比(bi)如(ru)1000R@100Mhz就(jiu)是(shi)(shi)說對100M頻(pin)(pin)(pin)(pin)(pin)(pin)率的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)信(xin)號有(you)(you)(you)1000歐(ou)姆(mu)(mu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu),因為(wei)磁(ci)(ci)珠(zhu)(zhu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)單位是(shi)(shi)按照它在(zai)某一頻(pin)(pin)(pin)(pin)(pin)(pin)率產生的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)阻(zu)(zu)抗(kang)(kang)來(lai)標稱(cheng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)，阻(zu)(zu)抗(kang)(kang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)單位也是(shi)(shi)歐(ou)姆(mu)(mu)。磁(ci)(ci)珠(zhu)(zhu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)datasheet上一般會(hui)附(fu)有(you)(you)(you)頻(pin)(pin)(pin)(pin)(pin)(pin)率和(he)(he)阻(zu)(zu)抗(kang)(kang)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)特性曲(qu)線(xian)(xian)(xian)(xian)(xian)(xian)圖(tu)。一般以(yi)(yi)100MHz為(wei)標準。磁(ci)(ci)珠(zhu)(zhu)可(ke)等(deng)(deng)(deng)效(xiao)(xiao)成一個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)，所以(yi)(yi)磁(ci)(ci)珠(zhu)(zhu)在(zai)EMI和(he)(he)EMC電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)中就(jiu)相(xiang)當(dang)于(yu)(yu)一個(ge)抑(yi)制(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)作用(yong)(yong)(yong)(yong)，主要是(shi)(shi)對高頻(pin)(pin)(pin)(pin)(pin)(pin)傳(chuan)(chuan)導干(gan)擾(rao)信(xin)號進(jin)行(xing)抑(yi)制(zhi)。磁(ci)(ci)珠(zhu)(zhu)可(ke)等(deng)(deng)(deng)效(xiao)(xiao)成一個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)，但這(zhe)個(ge)等(deng)(deng)(deng)效(xiao)(xiao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)與(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)線(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)是(shi)(shi)有(you)(you)(you)區別的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)，磁(ci)(ci)珠(zhu)(zhu)與(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)線(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)最大(da)區別就(jiu)是(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)線(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)有(you)(you)(you)分布電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)。因此，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)線(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)就(jiu)相(xiang)當(dang)于(yu)(yu)一個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)與(yu)(yu)一個(ge)分布電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)并聯。如(ru)圖(tu)1所示。圖(tu)1中，LX為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)線(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)等(deng)(deng)(deng)效(xiao)(xiao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)（理想電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)），RX為(wei)線(xian)(xian)(xian)(xian)(xian)(xian)圈(quan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)等(deng)(deng)(deng)效(xiao)(xiao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)，CX為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)的(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)(de)分布電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)。

磁珠符號用FB表示(shi)如FB1 FB2