Answer Depends on Component Model Type
| Element Type | Simulation Accuracy | Notes |
|---|---|---|
| S2P DUT block (measured) | Exact (to VNA accuracy) | Uses real measured VNA data — no model error |
| Ideal R/L/C elements | Exact for stated value | No Q, no parasitics — optimistic |
| Ideal T-line (Z₀, θ) | Exact for ideal TL | No dispersion, no loss — optimistic |
| Microstrip T-line (W, L, εr) | ±1% typical | Hammerstad-Jensen formula accuracy |
| Real Match (Murata data) | High accuracy to SRF | Uses manufacturer-measured component S2P |
When Ideal Component Simulation Is Sufficient
Frequency < 500 MHz:
Typical SMD inductor Q > 100 → ideal model gives <0.1 dB error
Component SRF typically > 5 GHz → ideal model valid at UHF
500 MHz to 2 GHz:
Inductor Q drops to 40–80 → ideal model underestimates IL by 0.2–0.5 dB
Use Real Match for more accurate pre-assembly prediction
Above 2 GHz:
SRF of 0402 SMD inductors approaches → ideal model can be very wrong
Always use Real Match or measured S2P component data above 2 GHz
Accuracy Example: 900 MHz L-Network
Design: shunt 6.8 pF C0G + series 3.5 nH inductor for 10 → 50 Ω match
Ideal simulation: S11 = −18 dB at 900 MHz (perfect)
Real Match (Murata LQP 3.3nH, C0G 6.8pF):
S11 = −14.5 dB at 900 MHz (realistic, includes Q and ±tolerance)
After PCB build (measured):
S11 = −12.8 dB (additional layout parasitics)
Lesson: ideal gives optimistic result; Real Match closer to reality;
measurement after PCB build reveals remaining layout effects.
RF View Best Practice: Use ideal elements for initial exploration, switch to Real Match for pre-assembly prediction, then compare with VNA measurement after assembly to identify layout effects. Free on Android.