To conclude-1 ●●● ●●●● ●●●●● ●●●0 S 4.3 Antenna noise temperature ●●●● ●●●0 ●●● ● ● Brightness Anteen temperature tempenta Background To Attenuator temperature Tp Tg (0.) Ideal antenna L=刘 (e=I) T +(L-1)Tp T4= =emTs+(1-eu)Tr Tp:physical temperature of antenna; L TB:background temperature; Th= ()sinOdod temprature )sin0d0dp J0=0 GP 9%=10ε号(9 N,kT BLs kBLs For a receiver:T=T+TLNE 10To conclude - 1 §4.3 Antenna noise temperature Tp: physical temperature of antenna; TB: background temperature; Tb: Brightness temperature For a receiver: 10     1 1 b P A rad b rad P TLT T eT e T L           2 0 0 2 0 0 , , sin , sin B b T D dd T D dd                              10log   A G G dB dB T K T  i t rt tt r i AS A S S GG P GP G N kT BL T kBL         TTT e A LNB  