Coaxial line impedance calculator
Online coaxial line calculator — characteristic impedance, cutoff frequency and per-metre parameters from the conductor and shield diameters.
Balanced two-wire line calculator
Online balanced line calculator — the characteristic impedance of a two-wire line from the spacing and the conductor diameter.
Balanced line with square conductors calculator
Online calculator for a balanced line of square section — the characteristic impedance for busbars and extrusions.
Coaxial line with a square shield calculator
Online rigid coaxial line calculator — characteristic impedance and dimensions for a round conductor inside a square shield.
Stripline in a rectangular shield calculator
Online rigid line calculator — characteristic impedance and strip width for a flat conductor inside a rectangular shield.
Stub matching calculator
Online single-stub matching calculator: the distance from the load, the length of a shorted and of an open stub, and both possible solutions.
SWR, Γ and return loss converter
Online converter: SWR ↔ reflection coefficient ↔ return loss ↔ reflected power, plus mismatch loss and load impedance.
Additional loss from SWR calculator
Online calculator of the extra feedline loss caused by mismatch: total loss, how many watts reach the antenna, and why the SWR at the input looks better than the real one.
Cable velocity factor calculator
Online measurement of a cable’s velocity factor from a resonance on a NanoVNA: vf, the permittivity of the insulation, capacitance per metre, and a comparison with the catalogue figure.
Cable fault distance calculator
Online cable fault location: the distance from the resonance spacing on a NanoVNA, from the reflection delay, or from the S11 phase, with the velocity factor applied.
Microstrip line calculator
Online microstrip calculator using Hammerstad’s formulas: characteristic impedance from the geometry, trace width for a wanted impedance, εeff and λg.
Coplanar waveguide calculator
Online coplanar waveguide calculator (CPW and CPWG): characteristic impedance from complete elliptic integrals, εeff and the wavelength in the line.
Coupled lines calculator
Online 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
Online estimate of how much power coaxial cable will take: the dielectric breakdown limit and the heating limit, corrected for SWR and temperature.
Coaxial cable loss calculator
Online coaxial cable loss calculator — power lost in the cable and the connectors at different frequencies.
Transmission line length calculator
Online cable length calculator — quarter-wave and half-wave sections with the velocity factor applied.