RF View Marker Types Overview
| Marker Mode | Function | Best For |
|---|---|---|
| Single Marker | Read frequency + level at one point | Quick spot-reading |
| Table Marker | Read all loaded traces at marker frequency | Multi-file comparison |
| Delta Marker (Δ) | Read difference from reference marker | Bandwidth, rejection measurement |
| BW Marker | Auto-find −X dB bandwidth around a peak or valley | Filter bandwidth, antenna BW |
| FN Marker | Flat noise: find frequency range within ±X dB of average | Amplifier gain flatness |
Single Marker Usage
1. Tap marker icon → tap on trace at desired point 2. Marker bubble shows: frequency (MHz/GHz) + parameter value (dB/VSWR/etc.) 3. Drag marker to different frequency 4. Read value: e.g., "1815 MHz → S21 = −1.83 dB"
Table Marker for Multi-File Comparison
1. Load 3–8 .s2p files in S-Parameter Plot
2. Activate Table Marker → tap on chart at design frequency
3. Table shows all loaded traces' values at that frequency:
File 1: S21 = −1.83 dB
File 2: S21 = −2.14 dB
File 3: S21 = −1.96 dB
4. Move marker → table updates in real time for all files
BW Marker Detailed Usage
BW Marker finds the bandwidth around a peak (for S21 passband)
or around a valley (for S11 matching depth).
For filter passband (S21):
1. Select S21 display → activate BW Marker
2. Set threshold: −3 dB (default), −10 dB (for S11 antenna BW)
3. BW Marker outputs:
- Peak frequency f₀
- Lower crossing f₁
- Upper crossing f₂
- Bandwidth = f₂ − f₁
- Q_L = f₀ / BW
4. Change threshold: set to −10 dB for VSWR<2 antenna bandwidth
Delta Marker for Rejection Measurement
Measure filter stopband rejection relative to passband:
1. Place Marker 1 at passband center (S21 peak)
e.g., 1815 MHz → S21 = −1.8 dB
2. Activate Delta Marker (Δ mode) relative to Marker 1
3. Move Δ marker to stopband frequency (e.g., 1750 MHz)
Reads: Δf = −65 MHz, ΔdB = −50.3 dB
4. Stopband rejection = 50.3 dB relative to passband ✓
RF View Markers: All five marker modes (Single, Table, Delta, BW, FN) work across all plot types: S11 dB, S21 dB, VSWR, phase, group delay, and Smith chart. Free on Android.