Este denumită astfel ca urmare a dispozitivului de adaptare folosit pentru adaptarea liniei de alimentare Ia antenă, în formă de Δ (fig. 110).
Lungimea antenei este X/2 şi poate fi determinată din formula
iar dimensiunea
Linia de alimentare de orice lungime are impedanţa caracteristică 600 ohmi şi este formată din doi conductori paraleli avînd diametrul 2 mm, distanţă între conductori 150 mm, izolaţie aeriană.
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