πŸ’‘ Left-click plot to add a permanent marker
Freq: β€”
No Data Loaded
Drag & drop SnP files anywhere on the plot
πŸ“₯
Drop SnP files to plot
S1P, S2P, S3P … S10P supported
Freq: β€”
Ready β€” drop SnP files to begin
Β© EECL RF & Microwave Engineering β†—

Graph Title & Screenshot

Cascade S-Parameters

Cascade multiple loaded N-port S-parameter files in series. Choose which port maps to input and output.

Add Marker Target:

S-Parameter Plotter β€” User Guide

Toolbar & Export

  • Drag & drop any Touchstone SnP file directly onto the plot area (S1P–S10P supported).
  • TDR Transform β€” computes the Time Domain Reflectometry (Step Impedance, Reflection, or Impulse Response) from a frequency domain trace. You can specify frequency limits to isolate bands or filter high-frequency noise, and apply DC Extrapolation (Linear or Constant) to improve step integration baseline stability.
  • Screenshot β€” click the Screenshot button to download a high-resolution transparent PNG image of the current plot area.

Navigating the Plot

  • Scroll wheel β€” zoom in/out around the cursor position on the frequency/time axis.
  • Click & drag on the plot β€” pan left/right along the active axis.
  • Auto-Scale button or press A β€” fits the view to all visible trace data, regardless of any manual limits.

Markers

  • Live Marker β€” hover over the plot to see real-time values in the floating tooltip and sidebar. Toggle with the Live Marker button in the toolbar.
  • Pinned Markers (Mx) β€” click anywhere on the plot to place a permanent marker. A popup lets you target all files or a specific file. Markers appear as red dashed lines with labelled tabs.
  • Drag a marker β€” hover over a pinned marker line until the cursor changes to a resize arrow, then drag left/right to move it to a new frequency.
  • Delta Markers (Ξ”Mx) β€” after placing at least one standard marker, click the plot again. The popup shows a Delta Marker section; pick a reference marker and the new marker shows the difference in both frequency/time and amplitude.
  • Remove a marker β€” click its tab at the top of the plot, or use the X button in the Pinned Markers panel.

Axis Limits

  • Set X Axis or Y Axis to Manual to enter precise limits, then click Apply Limits.
  • Press Enter while typing in any manual limit input to instantly apply the new scale limit mappings.
  • The Auto-Scale button (or A) always forces both axes to fit data, even if one or both are set to Manual.

Transmission Line Modeling (Tx Line)

  • Synthesize Ideal Lines β€” Create custom transmission line files by entering a target characteristic impedance (Zβ‚€), electrical length in degrees, and path attenuation in dB at a given reference frequency (Fref).
  • Loss Scaling Laws β€” Choose how line losses scale across the sweep range. Use √f to model skin-effect conductor losses, f for linear dielectric dissipation, or Flat for static, frequency-independent path loss.
  • Mismatched Physics β€” The solver performs dynamic ABCD matrix-to-S-parameter calculations. If you model a line away from 50 Ξ© (e.g., 75 Ξ©), it will accurately generate reflection coefficients (S₁₁/Sβ‚‚β‚‚) and mismatch ripple overlays.
  • Plot & Cascade β€” Use Plot Line to generate the standalone network, or use Plot & Cascade to automatically splice the custom transmission line in series onto the end of all currently active frequency-domain networks.

Cascade Networks

  • Click Cascade Networks in the toolbar to open the cascade dialog.
  • Select which files to cascade (must be 2-port or more), choose the Input and Output ports for each, and reorder with the up/down buttons.
  • Calculate & Plot β€” computes the cascaded S-parameters using T-matrix multiplication and adds the result as a new file. All other files are hidden automatically; re-enable them via the sidebar checkboxes.
  • Download .s2p File β€” exports the cascaded result as a Touchstone S2P file in RI format.