Complete RF engineering glossary with formulas, tables, and practical examples: S-parameters, VSWR, Smith chart, impedance matching, Touchstone files, noise figure, Q factor, and 60+ terms.
S11 is the input reflection coefficient of a two-port network. Learn the definition, ...
S21 is the forward transmission coefficient: insertion loss for passive devices, forw...
VSWR (Voltage Standing Wave Ratio) measures impedance mismatch on transmission lines....
The Smith chart maps complex impedance to the reflection coefficient plane. Learn con...
Impedance matching transforms source/load impedance to Z₀=50 Ω for maximum power tran...
Touchstone (.s1p .s2p .s3p .s4p) is the standard file format for S-parameter data. Op...
Group delay is the negative phase derivative with frequency. Learn how to calculate i...
Noise figure measures how much an RF device degrades SNR. Learn the definition, Friis...
Microstrip is the most common RF PCB transmission line. Learn impedance formula, widt...
Characteristic impedance Z₀ is the intrinsic impedance of a transmission line. Explai...
RF filters are characterized by frequency response type: Butterworth (flat), Chebyshe...
Q factor is the ratio of energy stored to energy dissipated per cycle. Learn Q formul...
S-parameters describe how RF signals travel through a network in terms of power waves...
P1dB is the input/output power where amplifier gain drops 1 dB from linear value due ...
IIP3 and OIP3 are linearity figures-of-merit for RF amplifiers and mixers. Definition...
The scattering matrix [S] fully describes an N-port network's RF behavior using power...
The ABCD (chain) matrix enables cascade analysis of series-connected two-port network...
De-embedding removes test fixture, PCB launch, and cable effects from VNA measurement...
Mismatch loss is the additional insertion loss caused by impedance mismatch at a port...
Conjugate matching (Z_load = Z_source*) maximizes power transfer. Differs from noise ...
RF amplifier stability is assessed by Rollett's K-factor and the auxiliary stability ...
Butterworth filter provides maximally flat magnitude response in the passband with no...
Chebyshev filters have equal-ripple passband and steeper rolloff than Butterworth for...
Complete conversion table between Return Loss (dB), VSWR, reflection coefficient |Γ|,...
Phase response of S-parameters measures how much a signal is phase-shifted as it pass...
Touchstone file port numbering conventions for S2P, S3P, and S4P files. How port orde...
Rogers RO4350B is a low-loss RF laminate with εr=3.66, tan δ=0.0037. Halogen-free, CA...
RT/Duroid 5880 is a PTFE/glass microfiber substrate with εr=2.20, tan δ=0.0009. Indus...
Skin depth is the depth to which RF current penetrates a conductor. Determines conduc...
A reciprocal network has Sij = Sji for all port pairs. All passive components (filter...
Fractional bandwidth is the 3 dB bandwidth divided by center frequency (BW/f₀). Key p...
Gain compression occurs when RF amplifier gain decreases under large-signal input. P1...
A lossless network has a unitary S-matrix where all incident power is either transmit...
Intermodulation distortion (IMD) occurs when multiple signals mix in nonlinear device...
Phase noise quantifies short-term frequency instability of oscillators. Definition, L...
Harmonic distortion produces 2f, 3f, 4f spurious outputs from nonlinear RF amplifiers...
RF dynamic range is the range of signal levels a system can handle. Types: Spurious-F...
Gain flatness measures how constant an amplifier's S21 gain is across its operating b...
Passband ripple is the peak-to-peak variation of S21 within the filter passband. Cheb...
Stopband rejection is the attenuation provided by an RF filter at frequencies outside...
Antenna S11 and VSWR specifications for different wireless systems. Mobile phones nee...
Bessel (Thomson) filter provides maximally flat group delay and linear phase response...
Elliptic filters achieve the steepest rolloff for a given order by placing transmissi...
A two-port network has two ports with defined incident and reflected waves. S11, S21,...
Port impedance Z₀ defines the reference termination for S-parameter measurements. Ref...
Port isolation measures how much a signal at one port leaks to another port in an RF ...
Coplanar waveguide (CPW) places the ground conductor coplanar with the signal trace, ...
Stripline is a transmission line buried between two ground planes inside a PCB stacku...
VNA calibration removes systematic errors (directivity, source match, tracking) using...
Complete reference for Touchstone (SNP) file format: version 1 and 2 syntax, options ...
Understand noise temperature T_e, its relationship to noise figure F, Friis cascade f...
S-parameter analysis, Smith chart, impedance matching, circuit simulation and SNP batch processing — all free on Android.
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