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Coaxial Cable Characteristic Impedance & Cutoff Calculator

Easily calculate and compute coaxial cable characteristic impedance & cutoff calculator with accurate equations, live formulas, and expert guidance.

Center wire outer diameter.

Inside diameter of outer shield.

Insulator dielectric (e.g. 2.25 for solid Polyethylene / PTFE).

Calculated Result
47.5 Ω

Coax Impedance (Z₀)

Coax Impedance (Z₀)

47.5 Ω

Characteristic Impedance Z0

47.5

Te11 Cutoff Frequency Ghz

33

Capacitance Per Meter Pf

105.4

Diameter Ratio D Over D

3.28

47.5 — Ω

Calculation Breakdown

  1. Applied FormulaCalculates the TEM characteristic impedance Z0, higher-order TE11 modal cutoff frequency, and distributed capacitance for coaxial RF cables (e.g. RG-58, RG-6).C = \frac{2\pi \epsilon_0 \epsilon_r}{\ln(D/d)}, \quad L = \frac{\mu_0}{2\pi} \ln(D/d)

Coaxial Cable Impedance Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.012243648Coax Impedance (Z₀)

What Is the Coaxial Cable Characteristic Impedance & Cutoff Calculator?

This tool computes coaxial cable characteristic impedance & cutoff calculator with high precision arithmetic.

How Does the Coaxial Cable Characteristic Impedance & Cutoff Calculator Work?

Calculates the TEM characteristic impedance Z0, higher-order TE11 modal cutoff frequency, and distributed capacitance for coaxial RF cables (e.g. RG-58, RG-6).

Coaxial Cable Characteristic Impedance & Cutoff Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

C=2πϵ0ϵrln⁡(D/d),L=μ02πln⁡(D/d)C = \frac{2\pi \epsilon_0 \epsilon_r}{\ln(D/d)}, \quad L = \frac{\mu_0}{2\pi} \ln(D/d)

Calculates the TEM characteristic impedance Z0, higher-order TE11 modal cutoff frequency, and distributed capacitance for coaxial RF cables (e.g. RG-58, RG-6).

How to Use the Coaxial Cable Characteristic Impedance & Cutoff Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Coaxial Cable Characteristic Impedance & Cutoff Calculator Example

Input Values:

innerConductorDiameterDMm:0.90
dielectricOuterDiameterDMm:2.95
dielectricRelativePermittivityEr:2.25
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required Ω.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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