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Diffstat (limited to '3773/CH21/EX21.2/Ex21_2.sce')
| -rw-r--r-- | 3773/CH21/EX21.2/Ex21_2.sce | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/3773/CH21/EX21.2/Ex21_2.sce b/3773/CH21/EX21.2/Ex21_2.sce new file mode 100644 index 000000000..f6021e28f --- /dev/null +++ b/3773/CH21/EX21.2/Ex21_2.sce @@ -0,0 +1,24 @@ +//Chapter 21: Antenna Measurements +//Example 21-2.2 +clc; + +//Variable Initialization +horn_len = 350e-3 //Length of horn (m) +ap_wid = 200e-3 //Aperture width (m) +ap_hei = 150e-3 //Aperture height (m) +del_L = 0.2 //Peak to peak uncertainty (dB) +f = 10e9 //Frequency (Hz) +c = 3e8 //Speed of light (m/s) + +//Calculations +wave_lt = c/f //Wavelength (m) +r_rnf = wave_lt/(2*%pi) ////Outer boundary of reactive near field (m) +r_ff = 2*(ap_wid**2)/wave_lt //Fraunhofer region (m) +r2_ff = r_rnf/(10**(del_L/40)-1) //Minimum distance where effect of near field is small (m) +r3_ff = 2*horn_len/(10**(del_L/10)-1) //Minimum distance where effect of rotation of AUT is small (m) + +//Result +mprintf( "The Outer boundary of reactive near field is at a distance %.4f m",r_rnf) +mprintf( "\nThe Fraunhofer region starts at a distance %.1f m",r_ff) +mprintf( "\nThe Minimum distance where effect of near field is small enough is %.2f m",r2_ff) +mprintf( "\nThe Minimum distance where effect of rotation of AUT is small enough is %.1f m", r3_ff) |