Engineering calculator matrix
Calculators are organized by engineering scenario. Every tool publishes formula classes, model boundaries, versions, and references.
Units, levels, and matching
Handle dB references, linear quantities, and RF reflection relationships—the common language for later engineering calculations.
Fields, waves, and materials
Support early structural, shielding, and field-region decisions with explicit media and near/far-field boundaries.
Wavelength and Critical Dimensions
Calculate wavelength and 1/4λ, 1/10λ, and 1/20λ dimensions from frequency and medium properties.
Skin Depth Calculator
Estimate conductor skin depth from frequency, conductivity, and relative permeability.
Capacitor Network and Anti-Resonance
Combine 1–6 C-ESR-ESL branch types by complex admittance to calculate network impedance, branch self-resonance, and model anti-resonance peaks.
Inductor Impedance and Self-Resonance
Calculate complex impedance, phase, Q, and self-resonance using a first-order series L-DCR branch in parallel with parasitic capacitance Cp.
EMI Filter Response
Use complex ABCD matrices to calculate loaded-voltage insertion loss, transfer, and port impedance for C, L, LC, pi, T, and order-2–5 low-pass ladders.
Order-2–5 Low-Pass Synthesis
Synthesize nominal order-2–5 low-pass ladder values from a cutoff frequency or stopband attenuation target using an equally terminated Butterworth prototype.
EM Field and Power Density
Convert E, H, B, and average power density for a free-space far-field plane wave.
Lumped Coupling Noise
Estimate lumped capacitive and inductive coupling under an electrically short approximation; NEXT/FEXT outputs are withheld until the distributed model has completed authoritative review.
Differential / Common-Mode Radiation
Estimate differential- and common-mode maximum far fields with Paul’s electrically small loop and two-conductor models, then compare the dominant radiation mode.
Shielding Effectiveness
Estimate skin depth, absorption loss, reflection loss, multiple-reflection correction, and aperture leakage for a uniform single-layer shield under a far-field plane-wave approximation.
Characteristic Impedance
Calculate microstrip, symmetric stripline and conventional unbacked CPW impedance, with inverse design on each model’s own geometry variable.
Power, impedance, and radiated links
Connect the transmitter, feed line, antenna, and spatial field strength for bidirectional RF-link calculations.
Measurement chains and field regions
Handle receiver corrections, test distance, and far-field conditions for pre-compliance and measurement review.
Antenna Factor and Field Strength Calculator
Calculate field strength from receiver reading, antenna factor, cable loss, and preamplifier gain.
Test-Distance Extrapolation
Convert field strength to a target distance using FCC 20/40 dB-per-decade rules or a documented custom basis.
Far-Field Distance Calculator
Calculate the Fraunhofer distance from frequency and antenna size, then check measurement-distance margin.