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Latest posts from topic “esercizio antenne 230318” Latest posts from topic “esercizio antenne 230318” on “ElectroYou”. 2022-01-05T18:45:16Z https://www.electroyou.it/forum/viewtopic.php?f=36&t=85632 Re: esercizio antenne 230318 https://www.electroyou.it/forum/viewtopic.php?f=36&t=85632#p909640 dannywall 2022-01-06T12:43:34Z 2022-01-06T12:43:34Z
[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

Ho riportato solo i passaggi chiave
Re: esercizio antenne 230318 https://www.electroyou.it/forum/viewtopic.php?f=36&t=85632#p909632 IsidoroKZ 2022-01-06T12:08:52Z 2022-01-06T12:08:52Z
Se scrivi \sin e \cos si legge meglio. L'unità immaginaria è \text {j} o ancora meglio \mathrm {j}
Re: esercizio antenne 230318 https://www.electroyou.it/forum/viewtopic.php?f=36&t=85632#p909630 dannywall 2022-01-06T11:33:37Z 2022-01-06T11:33:37Z
facendo i conti mi sono accorto di aver sbagliato...allora ho fatto si lo studio in funzione di moduli uguali e fasi opposte ed ho:
[unparseable or potentially dangerous latex formula] considerando [unparseable or potentially dangerous latex formula]
ricavo che [unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula] allora [unparseable or potentially dangerous latex formula] volendo il valore minimo > di \frac{\lambda}{4}=14.2857mm ho che con n=0 h=0.3265 mmmentre con n=1 h=15.1881mm

per d sfrutto le fasi:
[unparseable or potentially dangerous latex formula]
da cui ho:
[unparseable or potentially dangerous latex formula] quindi prendendo n=0 ho d=10.92 mm ed infatti non è risolta con n=1 ho d=62.7388mm
esercizio antenne 230318 https://www.electroyou.it/forum/viewtopic.php?f=36&t=85632#p909569 dannywall 2022-01-05T18:45:16Z 2022-01-05T18:45:16Z
salve vorrei un parere su questo esercizio:
Immagine 2022-01-05 183015.jpg

la prima specifica chiede le misure minime di d ed h ma >di\lambda/4 tale da avere campo nullo.
r_1=r-h\sin\theta \theta_1=\pi-\theta
r_2=r-d\cos\theta \theta_2=\frac{\pi}{2}-\theta
r_3=r+h\sin\theta \theta_3=\theta
sono arrivato a descrivere il campo e il fattore su cui lavorare è:
[unparseable or potentially dangerous latex formula]
devo quindi verificare i valori di h e d per cui questo sia nullo.
avevo pensato di porre il modulo dei due "fattori" uguali e le fasi sfasate di n\pi ,in questo modo dai moduli ricaverei h e dalle fasi d,così facendo però ho un h dell'ordine dei micro mentre un d di milli.

l'alternativa per h era porre il sin()=0 però così non avrei il controllo sul secondo pezzo, e per d fare uno studio delle fasi di tutto.