🔵 Resonance & LC
LC Circuit Solver
Solve for L, C, or f₀ — fill any two, get the third.
Bandpass Calculator
f₀, Q, and bandwidth from R, L, C for series or parallel RLC.
Coupled Resonators
Mode splitting, bandwidth, and coupling regime for two magnetically coupled LC tanks.
🟣 Transmission Lines
Microstrip
Z₀ and εeff from geometry, or trace width from target Z₀.
Coaxial Line
Z₀, velocity factor, and cutoff frequency for coax cable.
Stripline
Fully shielded TEM stripline between two ground planes.
Coplanar Waveguide
CPW and GCPW Z₀ using elliptic integral conformal mapping.
Differential Pair
Z_diff and Z_odd for edge-coupled microstrip pairs.
Stub Calculator
Open/short stub length for a target shunt susceptance.
Quarter-Wave Transformer
λ/4 impedance transformer Z and physical length.
TL Loss & Delay
Conductor + dielectric insertion loss and propagation delay for microstrip and coax.
🔴 Impedance Matching
Interactive Smith Chart
HiDPI Smith Chart — click to read, pin points, rotate with stubs.
VSWR / Return Loss
Live converter between VSWR, |Γ|, return loss, and mismatch loss.
L-Network Matcher
L, C values for single-frequency impedance matching.
Pi / T Network
Pi and T matching networks with free choice of loaded Q.
Wilkinson Divider
Equal and unequal power splits with isolation resistor.
LC BALUN
Lattice and Pi BALUN design with impedance transformation.
Capacitor Network
Total capacitance for series and parallel combinations.
Impedance Matching Network
L-network for complex ZS→ZL with Smith Chart trajectories.
Coupler & Hybrid
Coupled-line, branchline (90°), and rat-race (180°) hybrid design.
🟡 Filters & Attenuators
LC Filter Designer
Butterworth/Chebyshev LP/HP up to 9th order with BOM.
Attenuator Designer
Pi, T, L-pad, and Bridged-T resistor values for any attenuation.
Stepped-Z LPF
Microstrip stepped-impedance LPF: Butterworth or Chebyshev, with trace dimensions.
🟠 Antennas & Arrays
Dipole Antenna
Half-wave dipole arm length and shortening factor.
Patch Antenna
Patch width, length, and effective permittivity for any substrate.
Array Factor Plotter
Polar radiation pattern for N-element linear arrays with steering.
Helical Antenna
Axial-mode helix gain, HPBW, and dimensions via Kraus formulas.
Yagi-Uda Antenna
Gain, element lengths, and boom size for 2–9 element Yagis (NBS/Viezbicke tables).
🔵 System & RF Analysis
Friis Equation
Received power from EIRP, path loss, and antenna gains.
Cascaded Noise Figure
System NF and gain for up to 8 cascaded stages (Friis).
Link Budget
End-to-end RF link: EIRP, path loss, noise floor, SNR margin.
Radar Range Equation
R_max and received power from transmit power, RCS, and gains.
IP3 & Intermodulation
OIP3, IM3 product power, and IMD ratio from IIP3 and gain.
Power Combining
N-way combiner output power with efficiency and failure analysis.
Amplifier Stability
Rollett K-factor, µ-factor, MAG/MSG from S-parameters. Unconditional stability check.
PLL Loop Filter
Type-2 3rd-order passive loop filter component values from bandwidth and phase margin.
🟤 Utilities & Converters
dBm ↔ Watts
Convert between dBm and watts in either direction.
Wavelength
Free-space λ from frequency and dielectric constant.
Freq / λ / Energy
Live converter: frequency, wavelength, period, photon energy, B₀.
Skin Depth
Conductor skin depth vs frequency and conductivity.
Phase Noise → Jitter
Integrate a piecewise phase noise profile to RMS jitter.
S/Z/Y/ABCD Converter
Convert between all four 2-port parameter representations.
S-Parameter Plotter
Plot Touchstone .s1p–.s4p files with Chart.js.
Bond Wire & Via
Inductance of bond wires (Grover) and PCB vias with SRF.
E-Series Finder
Nearest standard R, C, or L value in E6–E192 with % error.
🟣 MRI Coils & Tools
Loop Inductance
Inductance of a single circular loop (Rosa formula).
Simple RF Coil Designer
Wheeler inductance, wire resistance, Q, and tuning cap for solenoid coils.
Surface Coil Designer
Complete MRI surface receive coil design with matching network.
Birdcage Coil
LP/HP birdcage MRI volume coil: element values and mode frequencies.
SAR Estimator
Local SAR from B₁⁺, frequency, tissue type vs IEC limits.
Array Decoupling
Mutual inductance and overlap/capacitive/preamp decoupling.
📡 Waveguide
🔬 Simulators
📖 Wiki — 57 Reference Articles
dB & dBm
Complex Impedance
Smith Chart Tutorial
VSWR & Return Loss
VNA Measurements
S-Parameters
Impedance Matching
Transmission Lines
Microwave Lines
PCB RF Design
Coax Cable Reference
RF Connectors
Attenuators
RF Filters
Power Dividers
IP3 & IMD
RF Amplifiers
PA Design
Noise in RF
Cascade Analysis
Link Budgets
Superheterodyne Rx
Mixers
Modulation
Oscillators
PLL & Synthesis
Phase Noise
Radar
FMCW Radar
Antennas
Polarisation
Frequency Bands
EMC Shielding
RF Safety
EM Waves
Maxwell's Equations
Skin Effect
Dielectrics
Magnetic Materials
Waveguides
Microwave Components
BALUNs
NMR Basics
Coil Design
Coil Types
Coil SNR
Birdcage Coil
Phased Arrays
Preamp Decoupling
MRI SAR
Gradient Coils
B₁ Mapping
MRI Hardware
MRI Sequences
MRI Contrast
MRI Artefacts
Parallel Imaging
Browse all 57 →