Nu este vorba de pierderi in antene, ci de ce le provocate de radiatia liniilor de alimentare, care, fiind asezate in apropierea diferitelor obstacole sau corpuri mai mult sau mai…
Aceste pierderi pot deveni foarte importante daca neglijam masurile ce au fost indicate in cap. V. Stim ca o linie de alimentari care se termina pe o sarcina avind impedanta…
Pentru, legatura dintre antena si radioreceptor sau radioemitator se utilizeaza doua tipuri de cabluri, cel panglica de 300 Ω impedanta si cablurile coaxiale de 50—75 Ω impedanta. În special atunci…
Aceste pierderi se manifesta prin scurgeri in izolatoare, mai ales in acele puncte ale antenei unde avem maxime de tensiune, respectiv la capetele antenei. Tensiunea de radiofrecventa la extremitatile antenei…
Orice conductor prin care trece un curent intens se incalzeste. Intensitatea curentului care trece printr-o unitate de suprafata din sectiunea conductorului poarta denumirea de „densitate a curentului". Astfel, pentru curent…
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