Transmission Line Phase <-> Length
Estimate electrical phase, delay, and wavelength from frequency, cable velocity factor, and physical length.
Ready.
Wavelength in line (m)N/A
Electrical length (lambda)N/A
Phase for current length (deg)N/A
Delay for current length (ns)N/A
Length for target phase (m)N/A
Length for target phase (cm)N/A
Length for target phase (mm)N/A
Length for target phase (in)N/A
- lambda(line) = c * VF / f
- Phase(deg) = 360 * length / lambda(line)
- Delay = length / (c * VF)
Design Context for Phase and Length Conversion
Transmission line length directly changes electrical phase, not just physical routing. This tool helps when you need a target phase offset, quarter-wave section estimate, or delay budget check across cables and fixtures.
Typical applications
- Cutting a harness to hit a target phase at a single design frequency.
- Estimating delay mismatch between two receive channels in phased systems.
- Checking whether a mechanical length change is electrically significant at GHz frequencies.
Worked intuition
- At higher frequency, the same physical cable corresponds to larger phase rotation.
- Higher velocity factor means longer in-line wavelength and lower phase per meter.
- Phase wraps every 360 degrees, so equivalent lengths differ by integer multiples of one wavelength.
Model boundaries
The calculator assumes a frequency-independent velocity factor and does not model dispersion, connector transitions, or temperature effects. Use vendor or measured phase-delay data when final tolerance margins are tight.