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銆�銆�EMI鏈夊叐姊濋�斿緫闆㈤枊鎴栭�插叆涓�鍊嬮浕璺細杓诲皠鍜屽偝灏�(d菐o)淇¤櫉杓诲皠鏄�氶亷澶栨鐨勭斧銆佹Ы銆侀枊瀛旀垨鍏朵粬缂哄彛娉勬紡鍑哄幓锛涜�屼俊铏熷偝灏�(d菐o)鍓囬�氶亷鑰﹀悎鍒伴浕婧�銆佷俊铏熷拰鎺у埗绶氫笂闆㈤枊澶栨锛屽湪闁嬫斁鐨勭┖闁撲腑鑷敱杓诲皠锛屽緸鑰岀敘(ch菐n)鐢熷共鎿�
銆�銆�寰堝EMI鎶戝埗閮介噰鐢ㄥ娈煎睆钄藉拰绺殭灞忚斀绲�(ji茅)鍚堢殑鏂瑰紡渚嗗鐝�(xi脿n)锛屽ぇ澶氭暩(sh霉)鏅傚�欎笅闈㈤�欎簺绨″柈鍘熷墖鍙互鏈夊姪浜庡鐝�(xi脿n)EMI灞忚斀锛氬緸婧愰牠铏曢檷浣庡共鎿撅紱閫氶亷灞忚斀銆侀亷婵炬垨鎺ュ湴灏囧共鎿剧敘(ch菐n)鐢熼浕璺殧闆互鍙婂寮锋晱鎰熼浕璺殑鎶楀共鎿捐兘鍔涚瓑EMI鎶戝埗鎬с�侀殧闆㈡�у拰浣庢晱鎰熸�ф噳(y墨ng)瑭蹭綔鐐烘墍鏈夐浕璺ō(sh猫)瑷堜汉鍝＄殑鐩(bi膩o)锛岄�欎簺鎬ц兘鍦ㄨō(sh猫)瑷堥殠娈电殑鏃╂湡灏辨噳(y墨ng)瀹屾垚
銆�銆�灏嶈ō(sh猫)瑷堝伐绋嬪斧鑰岃█锛岄噰鐢ㄥ睆钄芥潗鏂欐槸涓�绋湁鏁堥檷浣嶦MI鐨勬柟娉曞浠婂凡鏈夊绋娈煎睆钄芥潗鏂欏緱鍒板唬娉涗娇鐢�锛屽緸閲戝爆缃�銆佽杽閲戝爆鐗囧拰绠斿付鍒板湪灏�(d菐o)闆荤箶鐗╂垨鍗峰付涓婂櫞灏勬秱灞ゅ強閸嶅堡(濡傚皫(d菐o)闆绘紗鍙婇媴绶氬櫞娑傜瓑)鐒¤珫鏄噾灞倓鏄秱鏈夊皫(d菐o)闆诲堡鐨勫鏂欙紝涓�鏃﹁ō(sh猫)瑷堜汉鍝＄⒑瀹氫綔鐐哄娈兼潗鏂欎箣鍚�锛屽氨鍙憲鎵嬮枊濮嬮伕鎿囪ク澧�
銆�銆�閲戝爆灞忚斀鏁堢巼
銆�銆�鍙敤灞忚斀鏁堢巼(SE)灏嶅睆钄界僵鐨勯仼鐢ㄦ�ч�茶瑭曚及锛屽叾鍠綅鏄垎璨�锛岃▓绠楀叕寮忕偤
銆�銆�SEdB=A+R+B
銆�銆�鍏朵腑 A锛氬惛鏀舵悕鑰�(dB) R锛氬弽灏勬悕鑰�(dB) B锛氭牎姝ｅ洜瀛�(dB)(閬╃敤浜庤杽灞忚斀缃╁収(n猫i)瀛樺湪澶氬�嬪弽灏勭殑鎯呮硜)
銆�銆�涓�鍊嬬啊鍠殑灞忚斀缃╂渻浣挎墍鐢�(ch菐n)鐢熺殑闆荤鍫村挤搴﹂檷鑷虫渶鍒濈殑鍗佸垎涔嬩竴锛屽嵆SE绛変簬20dB锛涜�屾湁浜涘牬鍚堝彲鑳芥渻瑕佹眰灏囧牬寮烽檷鑷崇偤鏈�鍒濈殑鍗佽惉鍒嗕箣涓�锛屽嵆SE瑕佺瓑浜�100dB
銆�銆�鍚告敹鎼嶈�楁槸鎸囬浕纾佹尝绌块亷灞忚斀缃╂檪鑳介噺鎼嶈�楃殑鏁�(sh霉)閲�锛屽惛鏀舵悕鑰楄▓绠楀紡鐐�
銆�銆�AdB=1.314(f脳蟽脳渭)1/2脳t
銆�銆�鍏朵腑 f锛氶牷鐜�(MHz) 渭锛氶妳鐨勫皫(d菐o)纾佺巼 蟽锛氶妳鐨勫皫(d菐o)闆荤巼 t锛氬睆钄界僵鍘氬害
銆�銆�鍙嶅皠鎼嶈��(杩戝牬)鐨勫ぇ灏忓彇姹轰簬闆荤娉㈢敘(ch菐n)鐢熸簮鐨勬�ц唱(zh矛)浠ュ強鑸囨尝婧愮殑璺濋洟灏嶄簬妗跨媭鎴栫洿绶氬舰鐧�(f膩)灏勫ぉ绶氳�岃█锛岄洟娉㈡簮瓒婅繎娉㈤樆瓒婇珮锛岀劧鍚庨毃钁楄垏娉㈡簮璺濋洟鐨勫鍔犺�屼笅闄�锛屼絾骞抽潰娉㈤樆鍓囩劇璁婂寲(鎭掔偤377)
銆�銆�鐩稿弽锛屽鏋滄尝婧愭槸涓�鍊嬪皬鍨嬬窔鍦�锛屽墖姝ゆ檪灏囦互纾佸牬鐐轰富锛岄洟娉㈡簮瓒婅繎娉㈤樆瓒婁綆娉㈤樆闅ㄨ憲鑸囨尝婧愯窛闆㈢殑澧炲姞鑰屽鍔�锛屼絾鐣�(d膩ng)璺濋洟瓒呴亷娉㈤暦鐨勫叚鍒嗕箣涓�鏅�锛屾尝闃讳笉鍐嶈畩鍖栵紝鎭掑畾鍦�377铏�
銆�銆�鍙嶅皠鎼嶈�楅毃娉㈤樆鑸囧睆钄介樆鎶楃殑姣旂巼璁婂寲锛屽洜姝ゅ畠涓嶅儏鍙栨焙浜庢尝鐨勯鍨�锛岃�屼笖鍙栨焙浜庡睆钄界僵鑸囨尝婧愪箣闁撶殑璺濋洟閫欑ó鎯呮硜閬╃敤浜庡皬鍨嬪付灞忚斀鐨勮ō(sh猫)鍌�
銆�銆�杩戝牬鍙嶅皠鎼嶈�楀彲鎸変笅寮忚▓绠�
銆�銆�R(闆�)dB=321.8-(20脳lg r)-(30脳lg f)-[10脳lg(渭/蟽)] R(纾�)dB=14.6+(20脳lg r)+(10脳lg f)+[10脳lg(渭/蟽)]
銆�銆�鍏朵腑 r锛氭尝婧愯垏灞忚斀涔嬮枔鐨勮窛闆�
銆�銆�SE绠楀紡涓�闋呮槸鏍℃鍥犲瓙B锛屽叾瑷堢畻鍏紡鐐�
銆�銆�B=20lg[-exp(-2t/蟽)]
銆�銆�姝ゅ紡鍍呴仼鐢ㄤ簬杩戠鍫寸挵(hu谩n)澧冨苟涓斿惛鏀舵悕鑰楀皬浜�10dB鐨勬儏娉佺敱浜庡睆钄界墿鍚告敹鏁堢巼涓嶉珮锛屽叾鍏�(n猫i)閮ㄧ殑鍐嶅弽灏勬渻浣跨┛閬庡睆钄藉堡鍙︿竴闈㈢殑鑳介噺澧炲姞锛屾墍浠ユ牎姝ｅ洜瀛愭槸鍊嬭矤鏁�(sh霉)锛岃〃绀哄睆钄芥晥鐜囩殑涓嬮檷鎯呮硜
銆�銆�EMI鎶戝埗绛栫暐
銆�銆�鍙湁濡傞噾灞拰閻典箣椤炲皫(d菐o)纾佺巼楂樼殑鏉愭枡鎵嶈兘鍦ㄦサ浣庨牷鐜囦笅閬斿埌杓冮珮灞忚斀鏁堢巼閫欎簺鏉愭枡鐨勫皫(d菐o)纾佺巼鏈冮毃钁楅牷鐜囧鍔犺�岄檷浣�锛屽彟澶栧鏋滃垵濮嬬鍫磋純寮蜂篃鏈冧娇灏�(d菐o)纾佺巼闄嶄綆锛岄倓鏈夊氨鏄噰鐢ㄦ姊版柟娉曞皣灞忚斀缃╀綔鎴愯(gu墨)瀹氬舰鐙�鍚屾ǎ鏈冮檷浣庡皫(d菐o)纾佺巼缍滀笂鎵�杩�锛岄伕鎿囩敤浜庡睆钄界殑楂樺皫(d菐o)纾佹�ф潗鏂欓潪甯稿京(f霉)闆�锛岄�氬父瑕佸悜EMI灞忚斀鏉愭枡渚涙噳(y墨ng)鍟嗕互鍙婃湁闂�(gu膩n)鍜ㄨ姗熸(g貌u)灏嬫眰瑙ｆ焙鏂规
銆�銆�鍦ㄩ珮闋婚浕鍫翠笅锛岄噰鐢ㄨ杽灞ら噾灞綔鐐哄娈兼垨鍏�(n猫i)瑗潗鏂欏彲閬斿埌鑹ソ鐨勫睆钄芥晥鏋�锛屼絾姊濅欢鏄睆钄藉繀闋堥�ｇ簩(x霉)锛屽苟灏囨晱鎰熼儴鍒嗗畬鍏ㄩ伄钃嬩綇锛屾矑鏈夌己鍙ｆ垨绺殭(褰㈡垚涓�鍊嬫硶鎷夌绫�)鐒惰�屽湪瀵﹂殯涓鍒堕�犱竴鍊嬬劇鎺ョ斧鍙婄己鍙ｇ殑灞忚斀缃╂槸涓嶅彲鑳界殑锛岀敱浜庡睆钄界僵瑕佸垎鎴愬鍊嬮儴鍒嗛�茶鍒朵綔锛屽洜姝ゅ氨鏈冩湁绺殭闇�瑕佹帴鍚�锛屽彟澶栭�氬父閭勫緱鍦ㄥ睆钄界僵涓婃墦瀛斾互渚垮畨瑁濊垏鎻掑崱鎴栬閰嶇祫浠剁殑閫ｇ窔
銆�銆�瑷�(sh猫)瑷堝睆钄界僵鐨勫洶闆ｅ湪浜庡埗閫犻亷绋嬩腑涓嶅彲閬垮厤鏈冪敘(ch菐n)鐢熷瓟闅欙紝鑰屼笖瑷�(sh猫)鍌欓亱琛岄亷绋嬩腑閭勬渻闇�瑕佺敤鍒伴�欎簺瀛旈殭鍒堕��銆侀潰鏉块�ｇ窔銆侀�氶ⅷ(f膿ng)鍙ｃ�佸閮ㄧ洠(ji膩n)娓獥鍙ｄ互鍙婇潰鏉垮畨瑁濈祫浠剁瓑閮介渶瑕佸湪灞忚斀缃╀笂鎵撳瓟锛屽緸鑰屽ぇ澶ч檷浣庝簡灞忚斀鎬ц兘鐩＄婧濇Ы鍜岀斧闅欎笉鍙伩鍏�锛屼絾鍦ㄥ睆钄借ō(sh猫)瑷堜腑灏嶈垏闆昏矾宸ヤ綔闋荤巼娉㈤暦鏈夐棞(gu膩n)鐨勬簼妲介暦搴︿綔浠旂窗鑰冩叜鏄緢鏈夊ソ铏曠殑
銆�銆�浠讳竴闋荤巼闆荤娉㈢殑娉㈤暦鐐�: 娉㈤暦(位)=鍏夐��(C)/闋荤巼(Hz)
銆�銆�鐣�(d膩ng)绺殭闀峰害鐐烘尝闀�(鎴闋荤巼)鐨勪竴鍗婃檪,RF娉㈤枊濮嬩互20dB/10鍊嶉牷(1/10鎴闋荤巼)鎴�6dB/8鍊嶉牷(1/2鎴闋荤巼)鐨勯�熺巼琛版笡閫氬父RF鐧�(f膩)灏勯牷鐜囪秺楂樿“娓涜秺鍤�(y谩n)閲嶏紝鍥犵偤瀹冪殑娉㈤暦瓒婄煭鐣�(d膩ng)娑夊強鍒伴牷鐜囨檪锛屽繀闋堣鑰冩叜鍙兘鏈冨嚭鐝�(xi脿n)鐨勪换浣曡娉�锛屼笉閬庡闅涗笂鍙渶鑰冩叜涓�娆″強浜屾璜ф尝鍗冲彲
銆�銆�涓�鏃︾煡閬撲簡灞忚斀缃╁収(n猫i)RF杓诲皠鐨勯牷鐜囧強寮峰害锛屽氨鍙▓绠楀嚭灞忚斀缃╃殑鍏佽ū绺殭鍜屾簼妲戒緥濡傚鏋滈渶瑕佸皪1GHz(娉㈤暦鐐�300mm)鐨勮蓟灏勮“娓�26dB,鍓�150mm鐨勭斧闅欏皣鏈冮枊濮嬬敘(ch菐n)鐢熻“娓�锛屽洜姝ょ暥(d膩ng)瀛樺湪灏忎簬150mm鐨勭斧闅欐檪锛�1GHz杓诲皠灏辨渻琚“娓涙墍浠ュ皪1GHz闋荤巼渚嗚瑳锛岃嫢闇�瑕佽“娓�20dB锛屽墖绺殭鎳�(y墨ng)灏忎簬15 mm(150mm鐨�1/10)锛岄渶瑕佽“娓�26dB鏅�锛岀斧闅欐噳(y墨ng)灏忎簬7.5 mm(15mm鐨�1/2浠ヤ笂)锛岄渶瑕佽“娓�32dB鏅傦紝绺殭鎳�(y墨ng)灏忎簬3.75 mm(7.5mm鐨�1/2浠ヤ笂)
銆�銆�鍙噰鐢ㄥ悎閬╃殑灏�(d菐o)闆昏ク澧婁娇绺殭澶у皬闄愬畾鍦ㄨ(gu墨)瀹氬昂瀵稿収(n猫i)锛屽緸鑰屽鐝�(xi脿n)閫欑ó琛版笡鏁堟灉
銆�銆�灞忚斀瑷�(sh猫)瑷堥洠榛�
銆�銆�鐢变簬鎺ョ斧鏈冨皫(d菐o)鑷村睆钄界僵灏�(d菐o)閫氱巼涓嬮檷锛屽洜姝ゅ睆钄芥晥鐜囦篃鏈冮檷浣庤娉ㄦ剰浣庝簬鎴闋荤巼鐨勮蓟灏勫叾琛版笡鍙彇姹轰簬绺殭鐨勯暦搴︾洿寰戞瘮锛屼緥濡傞暦搴︾洿寰戞瘮鐐�3鏅傚彲鐛插緱100dB鐨勮“娓涘湪闇�瑕佺┛瀛旀檪锛屽彲鍒╃敤鍘氬睆钄界僵涓婇潰灏忓瓟鐨勬尝灏�(d菐o)鐗规�э紱鍙︿竴绋鐝�(xi脿n)杓冮珮闀峰害鐩村緫姣旂殑鏂规硶鏄檮鍔犱竴鍊嬪皬鍨嬮噾灞睆钄界墿锛屽涓�鍊嬪ぇ灏忓悎閬╃殑瑗涓婅堪鍘熺悊鍙婂叾鍦ㄥ绺儏娉佷笅鐨勬帹寤ｆ(g貌u)鎴愬瀛斿睆钄界僵瑷�(sh猫)瑷堝熀绀�(ch菙)
銆�銆�澶氬瓟钖勫瀷灞忚斀灞わ細澶氬瓟鐨勪緥瀛愬緢澶�锛屾瘮濡傝杽閲戝爆鐗囦笂鐨勯�氶ⅷ(f膿ng)瀛旂瓑绛夛紝鐣�(d膩ng)鍚勫瓟闁撹窛杓冭繎鏅傝ō(sh猫)瑷堜笂蹇呴爤瑕佷粩绱拌�冩叜涓嬮潰鏄椤炴儏娉佷笅灞忚斀鏁堢巼瑷堢畻鍏紡
銆�銆�SE=[20lg (fc/o/蟽)]-10lg n 鍏朵腑 fc/o锛氭埅姝㈤牷鐜� n锛氬瓟娲炴暩(sh霉)鐩�
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