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Diffstat (limited to '3773/CH8/EX8.3/Ex8_3.sce')
| -rw-r--r-- | 3773/CH8/EX8.3/Ex8_3.sce | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/3773/CH8/EX8.3/Ex8_3.sce b/3773/CH8/EX8.3/Ex8_3.sce new file mode 100644 index 000000000..0e809d417 --- /dev/null +++ b/3773/CH8/EX8.3/Ex8_3.sce @@ -0,0 +1,21 @@ +//Chapter 8: Helical Antennas +//Example 8-5.3 +clc; + +//Variable Initialization +n = 10.0 //Number of turns (unitless) +S = 0.236 //Spacing between turns (lambda) +n_a = 4.0 //Number of helical antennas in the array (unitless) + +//Calculation +D = 12*n*S //Directivity of a single antenna(unitless) +Ae = D/(4*%pi) //Effective aperture (lambda^2) + +A = sqrt(Ae) //Area of square/spacing between helixes (lambda) +Ae_total = Ae*n_a //Total effective aperture (lambda^2) +D_array = (4*%pi*Ae_total) //Directivity of the array (unitless) +D_array_db = 10*log10(D_array) //Directivity of the array (dBi) + +//Result +mprintf("The best spacing between the helixes is %.1f lambda",A) +mprintf("\nThe directivity of the array is %d or %.1f dBi",D_array,D_array_db) |