Calculadora de Impedancia de Coaxial — Fórmula
## Coaxial Cable Impedance
### Formula
**Z0 = (138 / sqrt(Er)) x log10(D/d)**
Where D is the outer conductor inner diameter, d is the inner conductor outer diameter, and Er is the relative dielectric constant.
Common cables: RG-58 (50 ohm), RG-59 (75 ohm), RG-6 (75 ohm).
### Formula
**Z0 = (138 / sqrt(Er)) x log10(D/d)**
Where D is the outer conductor inner diameter, d is the inner conductor outer diameter, and Er is the relative dielectric constant.
Common cables: RG-58 (50 ohm), RG-59 (75 ohm), RG-6 (75 ohm).
Ejemplo Resuelto
RG-58-like: D = 3.5 mm, d = 0.9 mm, PTFE dielectric (Er = 2.3).
- Ratio = 3.5 / 0.9 = 3.889
- Z0 = 138 / sqrt(2.3) x log10(3.889)
- Z0 = 91.0 x 0.5898 = 53.7 ohms