1-Port Smith Chart Tuning Example - Anritsu MS2024B Manual

VNA Measurements

4-3 1-Port Smith Chart Tuning Example

4-3 1-Port Smith Chart Tuning Example
The Smith Chart is a useful tool for tuning input match. This complex impedance plot reveals
which matching elements are necessary to match a device under test to the reference
impedance (usually 50 ohms). Selecting "Smith Chart" as the graph type provides this
tuning-friendly graph.
In Figure 4-3, the untuned blue trace is overlaid on the tuned yellow trace. The untuned
response resembles a series capacitance and series resistance (starts as open circuit at low
frequency, and approaches center of chart towards higher frequencies). This series
capacitance is tuned out at 375 MHz by placing a shunt inductance in the circuit.
Figure 4-3. Smith Chart Tuning Example
Vector Network Analyzer MG PN: 10580-00289 Rev. K 4-5