AL
ApertureLab
Multi-port antenna matching
 All tools

Antenna matching

Optimize impedance match or total antenna efficiency

Choose the antenna port count, upload the corresponding Touchstone file, select the driven main port, and use the remaining ports as reactive tuning ports or 50 Ω terminations. The optimizer uses the full S-matrix, including coupling between ports.

Waiting for Touchstone
Secondary-port model Each secondary port can independently use 0–5 reactive tuning components or a 50 Ω termination.

Auto searches both alternating orientations for the selected component count.

Frequency bands

Optimize one network across multiple bands. Weight 1.0 = full priority; 0 = ignore that band.

S11 mode uses only the Touchstone data and is available for one- and multi-port antennas.

50 Ω referenceFull S-matrix couplingGeneric ideal L/C

Matching component models

Choose ideal parts or real manufacturer S-parameter models

Vendor mode uses imported S2P models, including frequency-dependent loss and parasitics. Select the manufacturer and series separately for inductors and capacitors.

Ideal generic L/C
InductorsIdeal library
Official model source ↗
CapacitorsIdeal library
Official model source ↗
Ideal lossless component values are active.

Switch to real vendor models after importing S2P files for the selected series.

Available online manufacturer catalogs
Upload the selected Touchstone file to begin.

Interactive main-port editor

Explore the selected port self-reflection

Editing S11. Edits are continuous across frequency: magnitude shaping preserves phase, phase shaping preserves magnitude, and Smith-chart shaping changes both. Use Tune frequency to shift the complete complex response lower or higher in frequency. Antenna edits do not automatically synthesize a new network; press Match when you want a new optimum.

Select brush center
Editing action
Vertical drag reshapes a smooth frequency region. Shift: 0 MHz
Imported main-port Sii Modified antenna Current matched result Optimization bands · colors match Band 1/2/… controls · opacity follows weight
|S11| (dB)
Drag vertically · smooth magnitude edit · phase stays fixed
S11 phase (degrees)Drag vertically · smooth phase edit · magnitude stays fixed
Upload the selected Touchstone file to activate the main-port editors.

How this version works

Search space

Main port0–5 component conventional series/shunt matching network to 50 Ω
Component ports0–5 ideal reactive L/C termination networks that load the coupled antenna
Continuous antenna what-if editorSmooth magnitude/phase/Smith edits act across a frequency neighborhood; Tune frequency shifts the complete complex main-port response lower or higher
Explicit Match workflowAntenna edits evaluate the existing network immediately, but a fresh topology/value optimization runs only when you press Match
Multi-band synthesisAdd up to six matching bands and assign each a 0–1 priority weight; the optimizer normalizes each band before combining their scores