The approximate feed point impedance at the center of a two-wire folded dipole antenna will be 300 ohms.
The combined effect of resistance and reactance in a circuit creates impedance, which opposes alternating current.
Consider the flat twin ribbon TV antenna wire with a 300 ohm impedance. A folded dipole's impedance is 4 times that of a half-wave dipole,
A folded dipole's impedance is found as;
Folded dipole's impedance = 4 × half-wave dipole
Half-wave dipole = 73 ohms
Folded dipole's impedance = 73 × 4
Folded dipole's impedance =292 ohms
Folded dipole's impedance ≈ 300 ohms.
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