Este prezentată în fig. 71 şi se poate realiza uşor pentru orice frecvenţă din gama undelor scurte. Ea constă dintr-un segment de cablu coaxial cu lungimea electrică de λ /4.
Ţinînd seama de coeficientul de scurtare al cablurilor coaxiale, care în medie este de circa 0,66, lungimea fizică a segmentului va fi (λ/4)—0,66.
Distanţa între segmentul în sfert de undă şi cablul de alimentare trebuie să fie minimum 5 cm. În punctul de conexiune la antenă, cablul şi conductorii buclei de simetrizare se leagă în paralel cu încrucişare.
Toate dispozitivele de simetrizare descrise pîna aici acţionează ca transformatoare cu raportul 1:1, deci impedanţa cablului coaxial de alimentare trebuie să fie egală cu impedanţa de intrare a antenei.
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