From first principles to advanced beamforming — our library of guides, tutorials, and deep-dives is free for engineers, students, and enthusiasts worldwide.
Structured topic guides — each covers a complete subject area with articles, equations, and worked examples.
From why a wire becomes a transmission line to a measured RF board — RLGC model, Z₀, propagation, reflections and VSWR, losses, microstrip, CPW, stripline, stubs, discontinuities and resonators.
A practical guide to the most common antenna types — how each works, where it's used, and how to choose the right one for your application.
From electric and magnetic fields to the four equations, electromagnetic waves and boundary conditions — and how they shape lines, waveguides and antennas.
From impedance, reflection coefficient and VSWR to reading the Smith chart and designing L-network and stub matches for real antennas.
How antennas radiate, and every parameter that describes them — patterns, directivity and gain, impedance, S11, efficiency, bandwidth, polarization, aperture and the Friis link.
Part 10: coplanar waveguide structure and fields, impedance by conformal mapping with K(k)/K′(k), effect of gap width and substrate, grounded CPW, CPW versus microstrip, advantages, limitations and calculator design examples.
Read guide →Part 11: symmetric and offset stripline, pure TEM propagation and impedance formulas, grounded CPW with via fences, stripline vs microstrip vs GCPW, and odd- and even-mode differential pairs on multilayer RF boards.
Read guide →Part 12: quarter-wave impedance inversion and transformers, half-wave lines, open and short stubs, bandwidth, bias feeds, harmonic traps and stub matching, with derivations and ten numerical design examples.
Read guide →Part 13: why discontinuities store energy, microstrip steps, open-end extension, bends and optimum mitres, T-junctions and power splitting, equivalent circuits, compensation techniques and EM simulation.
Read guide →Part 14: quarter-wave and half-wave resonators as RLC circuits, Q = β/2α, unloaded, loaded and external Q, microstrip, ring and coupled resonators, and their use in filters and oscillators.
Read guide →Part 15: a complete RF PCB design flow — structure and substrate selection, Z₀ and tolerances, connector launches, grounding and via fences, 2.5D and 3D EM simulation, fabrication, VNA, TRL and TDR verification and troubleshooting.
Read guide →Reach out directly — we're a small team of RF engineers and we actually reply.