3.插入衰减 L,=10l0gs. 201og (1-S.r.X1-S.r)-S.S.FF. S1-T) 1+201og =201o3 1-Sr0-Sr)-S.SD =L+△L3. 插入衰减 ( )( ) ( ) ( )( ) ( ) a i g L g L g L g L g L g L i L L S S S S S S S S S S S L = + D - G G - G - G - G G = + - G G - G - G - G G = = 1 1 1 20log 1 20log 1 1 1 20log 1 10log 11 22 12 21 21 21 11 22 12 21 2 21