Contrairement aux autres antennes de ce blog, je n'ai pas encore pu realiser physiquement le prototype de cette 16 elements, mais j'envisage de la realiser des que mon emploi du temps me le permettra.

 Je livre donc aux lecteurs le resultat d'une optimisation qui a tourne une nuit entiere sur mon PC . Les criteres d'optimisation etaient le gain , le rapport AV / AR , le SWR et les lobes lateraux .
On remarquera que malgre des centaines de tirages de l'optimiseur, je ne suis pas parvenu a faire descendre les lobes lateraux en dessous de  - 13 dB , malgre differents essais d'espacements entre elements. La raison vient d'un boom relativement court qu'il faudrait rallonger de 2m au moins pour reduire les lobes vers -20dB . A suivre lors d'un autre post.

Les dimensions :
La colonne de gauche  donne les distances cumulees sur le boom en partant du reflecteur . Le boom mesure donc un peu plus de 7.50m
La colonne perimetre  donne les perimetres des elements en metres .

element    distance   perimetre
                     (m)                (m)
reflecteur    0                2.242
radiateur    0.434         2.208
d1               1.000         2.117
d2               1.402         2.093
d3               1.896         2.014
d4               2.430         2.042
d5               2.932         2.014
d6               3.438         2.002
d7               3.944         2.002
d8               4.450         2.002
d9               4.956         2.002
d10             5.462         2.002
d11             5.968         2.002
d12             6.474         2.002
d13             7.028         2.006
d14             7.502         2.066


Le diagramme de rayonnement:

Le diagramme ci dessous est indique en espace libre , a noter les 2 lobes secondaires a -13 dB qui semblent resister aux diverses optimisations , pour cette longueur de boom.

Le gain est de 15.5 dBi
L'impedance de l'antenne est directement de 50ohm + j0  pour une connexion directe du coaxial .





d11



















Ci dessous le diagramme en 3D :




























Et enfin la courbe de SWR

Le fichier MMANA :

Faire copier - coller dans un fichier *.maa le texte suivant :


cubical quad 16 elements 144MHz F6ITS
*
145.0
***Wires***
64
0.0, -0.28025, -0.28025, 0.0, -0.28025, 0.28025, 0.003, -1
0.0, -0.28025, 0.28025, 0.0, 0.28025, 0.28025, 0.003, -1
0.0, 0.28025, 0.28025, 0.0, 0.28025, -0.28025, 0.003, -1
0.0, 0.28025, -0.28025, 0.0, -0.28025, -0.28025, 0.003, -1
0.434, -0.2635, -0.2635, 0.434, -0.2635, 0.2635, 0.003, -1
0.434, -0.2635, 0.2635, 0.434, 0.2635, 0.2635, 0.003, -1
0.434, 0.2635, 0.2635, 0.434, 0.2635, -0.2635, 0.003, -1
0.434, 0.2635, -0.2635, 0.434, -0.2635, -0.2635, 0.003, -1
1.0, -0.264625, -0.264625, 1.0, -0.264625, 0.264625, 0.003, -1
1.0, -0.264625, 0.264625, 1.0, 0.264625, 0.264625, 0.003, -1
1.0, 0.264625, 0.264625, 1.0, 0.264625, -0.264625, 0.003, -1
1.0, 0.264625, -0.264625, 1.0, -0.264625, -0.264625, 0.003, -1
1.402, -0.261625, -0.261625, 1.402, -0.261625, 0.261625, 0.003, -1
1.402, -0.261625, 0.261625, 1.402, 0.261625, 0.261625, 0.003, -1
1.402, 0.261625, 0.261625, 1.402, 0.261625, -0.261625, 0.003, -1
1.402, 0.261625, -0.261625, 1.402, -0.261625, -0.261625, 0.003, -1
7.502, -0.25825, -0.25825, 7.502, -0.25825, 0.25825, 0.003, -1
7.502, -0.25825, 0.25825, 7.502, 0.25825, 0.25825, 0.003, -1
7.502, 0.25825, 0.25825, 7.502, 0.25825, -0.25825, 0.003, -1
7.502, 0.25825, -0.25825, 7.502, -0.25825, -0.25825, 0.003, -1
7.028, -0.25075, -0.25075, 7.028, -0.25075, 0.25075, 0.003, -1
7.028, -0.25075, 0.25075, 7.028, 0.25075, 0.25075, 0.003, -1
7.028, 0.25075, 0.25075, 7.028, 0.25075, -0.25075, 0.003, -1
7.028, 0.25075, -0.25075, 7.028, -0.25075, -0.25075, 0.003, -1
6.474, -0.25025, -0.25025, 6.474, -0.25025, 0.25025, 0.003, -1
6.474, -0.25025, 0.25025, 6.474, 0.25025, 0.25025, 0.003, -1
6.474, 0.25025, 0.25025, 6.474, 0.25025, -0.25025, 0.003, -1
6.474, 0.25025, -0.25025, 6.474, -0.25025, -0.25025, 0.003, -1
5.968, -0.25025, -0.25025, 5.968, -0.25025, 0.25025, 0.003, -1
5.968, -0.25025, 0.25025, 5.968, 0.25025, 0.25025, 0.003, -1
5.968, 0.25025, 0.25025, 5.968, 0.25025, -0.25025, 0.003, -1
5.968, 0.25025, -0.25025, 5.968, -0.25025, -0.25025, 0.003, -1
5.462, -0.25025, -0.25025, 5.462, -0.25025, 0.25025, 0.003, -1
5.462, -0.25025, 0.25025, 5.462, 0.25025, 0.25025, 0.003, -1
5.462, 0.25025, 0.25025, 5.462, 0.25025, -0.25025, 0.003, -1
5.462, 0.25025, -0.25025, 5.462, -0.25025, -0.25025, 0.003, -1
4.956, -0.25025, -0.25025, 4.956, -0.25025, 0.25025, 0.003, -1
4.956, -0.25025, 0.25025, 4.956, 0.25025, 0.25025, 0.003, -1
4.956, 0.25025, 0.25025, 4.956, 0.25025, -0.25025, 0.003, -1
4.956, 0.25025, -0.25025, 4.956, -0.25025, -0.25025, 0.003, -1
4.45, -0.25025, -0.25025, 4.45, -0.25025, 0.25025, 0.003, -1
4.45, -0.25025, 0.25025, 4.45, 0.25025, 0.25025, 0.003, -1
4.45, 0.25025, 0.25025, 4.45, 0.25025, -0.25025, 0.003, -1
4.45, 0.25025, -0.25025, 4.45, -0.25025, -0.25025, 0.003, -1
3.944, -0.25025, -0.25025, 3.944, -0.25025, 0.25025, 0.003, -1
3.944, -0.25025, 0.25025, 3.944, 0.25025, 0.25025, 0.003, -1
3.944, 0.25025, 0.25025, 3.944, 0.25025, -0.25025, 0.003, -1
3.944, 0.25025, -0.25025, 3.944, -0.25025, -0.25025, 0.003, -1
3.438, -0.25025, -0.25025, 3.438, -0.25025, 0.25025, 0.003, -1
3.438, -0.25025, 0.25025, 3.438, 0.25025, 0.25025, 0.003, -1
3.438, 0.25025, 0.25025, 3.438, 0.25025, -0.25025, 0.003, -1
3.438, 0.25025, -0.25025, 3.438, -0.25025, -0.25025, 0.003, -1
2.932, -0.25175, -0.25175, 2.932, -0.25175, 0.25175, 0.003, -1
2.932, -0.25175, 0.25175, 2.932, 0.25175, 0.25175, 0.003, -1
2.932, 0.25175, 0.25175, 2.932, 0.25175, -0.25175, 0.003, -1
2.932, 0.25175, -0.25175, 2.932, -0.25175, -0.25175, 0.003, -1
2.43, -0.25525, -0.25525, 2.43, -0.25525, 0.25525, 0.003, -1
2.43, -0.25525, 0.25525, 2.43, 0.25525, 0.25525, 0.003, -1
2.43, 0.25525, 0.25525, 2.43, 0.25525, -0.25525, 0.003, -1
2.43, 0.25525, -0.25525, 2.43, -0.25525, -0.25525, 0.003, -1
1.896, -0.25175, -0.25175, 1.896, -0.25175, 0.25175, 0.003, -1
1.896, -0.25175, 0.25175, 1.896, 0.25175, 0.25175, 0.003, -1
1.896, 0.25175, 0.25175, 1.896, 0.25175, -0.25175, 0.003, -1
1.896, 0.25175, -0.25175, 1.896, -0.25175, -0.25175, 0.003, -1
*** Source ***
1, 1
w8c, 0.0, 1.0
*** Load ***
0, 1
*** Segmentation ***
800, 80, 2.0, 1
*** G/H/M/R/AzEl/X ***
0, 7.0, 1, 50.0, 90, 90, 0.0
### Comment ###