RF and microwave · open source
Calculators that show the physics
Every input redraws the fields or currents along with the number. Every page shows its method and checks itself against published values.
01 · Conductors
Skin effect
Where AC current flows in a wire. Exact Bessel solution, Rac/Rdc, flat-conductor view.
checked: R/R0 table, ber/bei series02 · Transmission lines
Coaxial line
Z0, loss, TE11 cutoff (exact root) and peak power. Why 30, 60 and 77 Ω.
checked: cable data, optima, TE11 roots03 · Planar lines
Microstrip, solved live
A finite-difference Laplace solve in your browser, next to Hammerstad–Jensen. Synthesis and dispersion.
checked: 20-case sweep vs H–J, < 0.4%04 · Waveguides
Rectangular waveguide
TE and TM patterns, the mode chart, λg, vp, vg, impedance, loss and evanescent decay.
checked: Pozar Example 3.105 · Propagation
Path loss and link budget
Spherical spreading and effective aperture, Friis, rain (ITU-R P.838-3) and a waterfall budget.
checked: P.525 values, P.838-3 tableNext on the list
- Striplineconformal map, field picture
- CPW and grounded CPWelliptic integrals vs field solve
- Circular waveguideBessel modes, TE01 low loss
- VSWR and mismatchstanding wave on the line
- Quarter-wave transformerreflections cancelling
- Wilkinson dividereven and odd modes
- Coupled lineseven/odd fields, coupling
- Surface roughnessHammerstad and Huray
- Fresnel zone and two-rayclearance, breakpoint
- Cascaded noise figureFriis noise formula