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Diffstat (limited to '3773/CH21/EX21.1/Ex21_1.sce')
| -rw-r--r-- | 3773/CH21/EX21.1/Ex21_1.sce | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/3773/CH21/EX21.1/Ex21_1.sce b/3773/CH21/EX21.1/Ex21_1.sce new file mode 100644 index 000000000..ae615938d --- /dev/null +++ b/3773/CH21/EX21.1/Ex21_1.sce @@ -0,0 +1,24 @@ +//Chapter 21: Antenna Measurements +//Example 21-2.1 +clc; + +//Variable Initialization +f = 900e6 //Frequency (Hz) +len = 25e-3 //Length of antenna (m) +len_cell = 110e-3 //Length of handset chassis (m) +c = 3e8 //Speed of light (m/s) +del_L = 0.5 //Peak to Peak measurement uncertainty (dB) + +//Calculations +Dm = len + len_cell //Maximum Dimension of antenna (m) +wave_lt = c/f //Wavelength (m) +r_rnf = (wave_lt/(2*%pi)) //Outer boundary of reactive near field (m) +r_ff = 2*(Dm**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*Dm/(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 %.3f m",r_rnf) +mprintf( "\nThe Fraunhofer region starts at a distance %.3f m",r_ff) +mprintf( "\nThe Minimum distance where effect of near field is small enough is %.1f m",r2_ff) +mprintf( "\nThe Minimum distance where effect of rotation of AUT is small enough is %.1f m",r3_ff) |