Uneori nu acordăm suficientă importanţă simetriei dintre antenă şi linie. Cablurile coaxiale nu sînt linii simetrice, deoarece cele două conductoare (cel central şi cămaşa metalică exterioară) sînt diferite. De aceea, în cazul antenelor simetrice, folosirea unei linii de alimentare asimetrică modifică simetria generală şi chiar pe a antenei propriu-zise.
Este deci preferabilă, în cazul antenelor simetrice, folosirea liniilor de transmisie simetrice.
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