Stub Matching Calculator — Single Stub, Double Stub, λ/4 Transformer

Load & Line

Z₀ — Reference impedance (Ω)

Z_L — Load (R + jX)

Frequency (MHz)

Stub Type

Connection & termination

Enter Z_L and click Calculate to see solutions and Smith chart path.

Load & Line

Z₀ (Ω)

Z_L (R + jX)

Frequency (MHz)

Double Stub Setup

Stub separation d

Stub termination

Enter values and click Calculate.

Impedances

Z_S — Source (Ω, real)

Z_L — Load (Ω, real)

f₀ (MHz)

εᵣ_eff (for physical length)

Enter impedances and click Calculate.

Specifications

Z_S (Ω)

Z_L (Ω)

f₀ (MHz)

Sections N

Design

Enter specifications and click Calculate.

Stub & TL Matching Calculator