A station receiving system operates at 12 GHz and consists o

A station receiving system operates at 12 GHz and consists of 20 m antenna with a gain of 65 db and a T_AR = 60 K. a waveguide with a loss of 2 dB and aphysical temperature of 300 K. LNA with T_e = 50 K and 60 dB gain, and a down converter T_e = 11000 K. using matlab to find (G/T)dB for the receiving system at the input to the LNA, input to the waveguide, input to the down-converter.

Solution

clc;
clear all;
Ga=65; % Antenna Gain in dB
T_AR = 60; % Antenna Noise temperature in K

Gw = -2; % Gain of waveguide (Attenuation) dB
L=1.26; % Attenuation in ratio
Tw=300; % physical temperature
Tew = (L-1)*Tw;

G=60; % Gain of LNA in dB
Te=50; % Noise temperature

% G/T at input of Waveguide

G_T_W=Ga - 10*log10(T_AR); % units dB/K
display(G_T_W);

% G/T at input of LNA
G_T_L=(Ga+Gw)-10*log10(T_AR+Tew);
display(G_T_L);

% G/T at input of LNA
G_T_D=(Ga+Gw+G)-10*log10(T_AR+Tew+Te);
display(G_T_D);