Coaxial line impedance calculator
Coaxial cable impedance calculator — characteristic impedance from the inner and shield diameters, cutoff frequency and per-metre parameters, with formulas.
Balanced two-wire line calculator
Balanced two-wire line calculator — characteristic impedance from wire diameter and spacing. What impedance your home-made ladder line will have.
Balanced line with square conductors calculator
Balanced line of two square-section conductors — characteristic impedance for busbars, extrusions and rigid feeders.
Coaxial line with a square shield calculator
Square coax calculator — characteristic impedance and dimensions of a round conductor inside a square shield, for rigid lines.
Stripline in a rectangular shield calculator
Rigid stripline calculator — characteristic impedance and strip width for a flat conductor inside a rectangular shield.
Stub matching calculator
Single-stub matching calculator — distance from the load and the length of a shorted or open stub, with both possible solutions and a drawing of the line.
SWR, Γ and return loss converter
SWR converter — VSWR ↔ reflection coefficient (S11) ↔ return loss in dB ↔ reflected power, plus mismatch loss and load impedance. What your SWR means.
Additional loss from SWR calculator
SWR loss calculator — extra feedline loss from mismatch, total loss, the watts that reach the antenna and why SWR at the radio looks better than at the antenna.
Cable velocity factor calculator
Velocity factor calculator — measure a cable’s VF from a NanoVNA resonance: vf, insulation permittivity, capacitance per metre and a check against the datasheet.
Cable fault distance calculator
Distance to fault (DTF) on coax — find a cable break or short from NanoVNA resonance spacing, reflection delay or S11 phase, using the cable’s velocity factor.
Microstrip line calculator
Microstrip calculator using Hammerstad’s formulas — impedance from geometry, trace width for 50 Ω or any impedance, εeff and guided wavelength.
Coplanar waveguide calculator
Coplanar waveguide calculator for CPW and CPWG — characteristic impedance from complete elliptic integrals, εeff and the guided wavelength, with a drawing.
Coupled lines calculator
Coupled lines calculator — even- and odd-mode impedances for a wanted coupling, the inverse problem, and the length of the coupled section.
Coax power handling calculator
Coax power handling calculator — how many watts a coaxial cable will take: the dielectric breakdown and heating limits, corrected for SWR and temperature.
Coaxial cable loss calculator
Coax cable loss calculator — attenuation in the cable and connectors at your frequency and length, and how many watts reach the antenna. Popular cable presets.
Transmission line length calculator
Quarter-wave and half-wave coax length calculator with the velocity factor applied — for transformers, stubs and phasing lines.