S-PARAMETER ANALYSIS · LOCAL BY DEFAULT

Inspect, combine and qualify Touchstone data.

Open RF measurements directly in your browser. Plot S-parameters, use Smith and group-delay views, cascade 2-port networks, place stable named markers and check engineering limits without uploading the files.

No accountNo RF file uploadCommercial engineering use allowed

RF WORKSPACE

Touchstone viewer

Active DUT: No active DUT

R2.13 engineering preview

MEASURESelect a marker, then click the plotΔ1 · place M1 and M2

Measurements

RFELLOW · ANALYZER

Markers & measurements

Choose a marker, search a trace, or compare two points.

Markers

Select a point to measure or change its frequency.

Marker keysPress 1–9 anywhere on this page (except while typing). Uncheck to turn off.

CURSORSAdd a cursor to compare traces here.

Click place the active marker, or move a selected cursor when Move is enabledDrag live panWheel zoom at cursorDelta measurements are separate from markers and may be added independentlyBox zoom choose mode then drag a bandReset view restores the shared frequency span; Full range shows all file frequenciesLocked markers cannot move or clearGroup delay is estimated from discrete phase samples; sparse sweeps can alias

Cascade networksCombine two .s2p files in physical signal-path orderExpand

FULL TWO-PORT NETWORKStage 1 feeds Stage 2Select input-side and output-side networks in the order they are physically connected.

How cascading works →

Stage 1 · input-side network Stage 2 · output-side network

Load at least two 2-port files to combine networks.

What RFellow calculatesFull two-port cascade including interstage reflections—not just S21 dB addition. The files must use the same real Z₀ and share a frequency span. Result is a new derived dataset; source files stay unchanged.

LIMIT CHECK

Engineering requirements

Create several independent requirements such as insertion loss ≤ 2 dB and input return loss ≥ 15 dB. PASS requires every configured requirement to be evaluated and met at the available sampled frequencies. INCOMPLETE means a required parameter or sampled band is unavailable; FAIL means a measured sample exceeded a limit. A sparse sweep cannot prove compliance between measurement points.