Z0 = 1O(1)

1

• 1????
• Z0 1O (1)
• ?????? (V??,I??,R??or???????)
• V IR (2)
• 1??????,
• V I (3) ???????????
• ???,???
• P IV I2 V2
• SN?(??Signal-??Noise??)?????A?????????A2
• R???? 1????
• V1I1R(??) ???P1I1V1V12/R, V1I1(??) ? ??P1
  I1V1V12
• V2I2R(??) ???P2I2V2 V22/R, V2I2(??) ?
  ??P2I2V2 V22
• SN? ???dB????,???????????????
• P2/P1 V22/V12 P2/P1 V22/V12
• ? SN??,R??????1??????????????,1?????????????????,?
  ???R????????????

2
????????????? ? ???????????? ????? ?
???????????????? ???(?????/?????)???? ???
?????????????????????????????
?????????? ? ????????? ????? ?
??????(?????????????? ???(?????/?????)????
???????? ? ???????? ??? ????? ? ???????????
???
??????
????no.4????
3
???(?????????)??? ????????
1.??? ???(Continuous Wave CW)??
2.??????? ?????
4
??????(AM??)
???????????C(t)????????????? C(t)
Accos(wct qc ) (1) ???,Ac?????,wc????,
qc?????? AM????,wc,qc,??????Ac(???????????)???s(
t)??????????????, Ac(t) A1
ks(t) (2) ???,A,k??????????,AM?jAM(t)???????
????? jAM(t) A1 ks(t)cos (wct qc
) (3) ???,??s(t)??????1???(?????)s1(t)????,
s(t) s0s1(t)?????(3)? jAM(t) A1
ks0s1(t)cos (wct qc ) (4) ??????,m
ks0??????? jAM(t) A1 ms1(t)cos (wct
qc ) (5) ???????m????????s(t)??????coswmt?????
?????????? jAM(t) A1 m coswmtcos (wct
qc ) (6) ???,????m?1????,mgt1??????????,????
????????