Deterministic formulas
Values are calculated by tested code, not guessed by a language model.
TRACEABLE EMC FORMULA LIBRARY
More than a number.Understand why it works.
Reproducible tools for EMC, RF, and hardware engineers. Every result includes formulas, variable definitions, applicability, and authoritative references.
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VERIFIABLE QUICK CHECKLIVE FORMULA
INPUT
- Frequency
- 300 MHz
- Propagation medium
- Free space
- εᵣ
- 1
- μᵣ
- 1
EQUATIONλ = c / f
299 792 458 / (300 × 10⁶)Free-space wavelength0.9993 m
1/20 λ · Early aperture reference49.97 mm
i This is a single-frequency formula result at 300 MHz in free space—not a spectrum or a test limit.
ENGINEERING TOOL MATRIX
View all →Engineering calculator matrix
FOUNDATIONS
Units, levels, and matching
Handle dB references, linear quantities, and RF reflection relationships—the common language for later engineering calculations.
EMC DESIGN
Fields, waves, and materials
Support early structural, shielding, and field-region decisions with explicit media and near/far-field boundaries.
λEMC Design
Wavelength and Critical Dimensions
Calculate wavelength and 1/4λ, 1/10λ, and 1/20λ dimensions from frequency and medium properties.
δEMC Design
Skin Depth Calculator
Estimate conductor skin depth from frequency, conductivity, and relative permeability.
SRFEMC Design
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.
L/CpEMC Design
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.
ILEMC Design
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.
LCEMC Design
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.
E/HEMC Design
EM Field and Power Density
Convert E, H, B, and average power density for a free-space far-field plane wave.
XtalkEMC Design
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.
I_D/I_CEMC Design
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.
SEEMC Design
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.
Z₀EMC Design
Characteristic Impedance
Calculate microstrip, symmetric stripline and conventional unbacked CPW impedance, with inverse design on each model’s own geometry variable.
RF SYSTEMS
Power, impedance, and radiated links
Connect the transmitter, feed line, antenna, and spatial field strength for bidirectional RF-link calculations.
TEST & MEASUREMENT
Measurement chains and field regions
Handle receiver corrections, test distance, and far-field conditions for pre-compliance and measurement review.
AFTest & Measurement
Antenna Factor and Field Strength Calculator
Calculate field strength from receiver reading, antenna factor, cable loss, and preamplifier gain.
dTest & Measurement
Test-Distance Extrapolation
Convert field strength to a target distance using FCC 20/40 dB-per-decade rules or a documented custom basis.
FFTest & Measurement
Far-Field Distance Calculator
Calculate the Fraunhofer distance from frequency and antenna size, then check measurement-distance margin.
DESIGN PRINCIPLES
Engineering decisions need more than an answer.
Explicit assumptions
Media, field region, and model boundaries are stated so valid formulas are not misapplied.
Traceable references
Formulas link to standards, metrology guides, or technical reports with a recorded review date.