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Latest posts from topic “propagazione in cavo coassiale 22321” Latest posts from topic “propagazione in cavo coassiale 22321” on “ElectroYou”. 2022-03-19T11:04:40Z https://www.electroyou.it/forum/viewtopic.php?f=36&t=86113 propagazione in cavo coassiale 22321 https://www.electroyou.it/forum/viewtopic.php?f=36&t=86113#p915672 dannywall 2022-03-19T11:04:40Z 2022-03-19T11:04:40Z
Immagine 2022-03-16 173146.jpg


Un cavo coassiale indefinito in aria, di impedenza Z0=50Ω , viene riempito, da un certo punto in
poi, con un dielettrico di permittività εr 2=9 e conducibilità σ=0.05 S /m . Viene anche inserito un
blocchetto di dielettrico di permittività εr 1=4 e lunghezza 18.75 mm. Sapendo che l'ampiezza
massima del campo elettrico incidente dal tratto in aria è di 2 V/m, calcolare:
• il ROS a sinistra del blocchetto dielettrico di lunghezza d;
• il valore del minimo modulo di campo magnetico a distanza s dalla interfaccia tra l’aria e il
dielettrico εr 1 ;
• l'energia elettrica immagazzinata nel blocchetto dielettrico di lunghezza d.
Dati ulteriori: f =2 GHz , ri=0.7 cm , s = 2 cm.

salve mi mostro il procedimento...
ho calcolato i vari parametri...
\beta_0=\frac{40\pi}{3}
z_1=25 \beta_1=\frac{80\pi}{3}
z_2=9-0.45i

per il ros trovo [unparseable or potentially dangerous latex formula] lundo la linea lunga d
trovo [unparseable or potentially dangerous latex formula]
e il ros=\frac{1+\left | \Gamma \right |}{1-\left | \Gamma \right |}

poi per il campo magnetico sono partito dal campo elettrico incidente\left | E_{inc} \right |_{max}=\left | V^{+} \right |\left | e_t \right |_{max}
ricavando che [unparseable or potentially dangerous latex formula]
la corrente totale è \left | I_{tot} \right |=\left | \frac{V^{+}}{z_0} \right |\left | 1-\Gamma e^{2i\beta_0 z} \right |=0.2665 mA
\left | H \right |_{min}=\left | I_{tot} \right |\left | h_t \right |=2.6344m\frac{A}{m}
qui H non l'ho valutato in s considerando che la linea è in aria senza perdite e l'eventuale esponenziale complesso in modulo fa 1

poi per l'energia ho posto [unparseable or potentially dangerous latex formula] considerando [unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]

giusto?