WiFi Frontend Architecture
A WiFi frontend (802.11a/b/g/n/ac/ax/be) requires separate TX and RX chains for each supported band (2.4 GHz, 5 GHz, 6 GHz for WiFi 6E). Key components: RF switch, SAW/BAW filter, LNA (RX), PA (TX), and antenna matching network.
WiFi Band S-Parameter Specifications
| Band | Frequency | Max Ch BW | Filter IL Max |
|---|---|---|---|
| WiFi 2.4 GHz | 2400–2484 MHz | 40 MHz (HT40) | 2.5 dB (SAW) |
| WiFi 5 GHz | 5150–5850 MHz | 160 MHz (VHT160) | 2.0 dB (BAW) |
| WiFi 6E (6 GHz) | 5925–7125 MHz | 320 MHz (EHT320) | 2.5 dB (BAW) |
Key Analysis Tasks with RF View
- 2.4 GHz SAW filter: Load .s2p → BW Marker reads 2400–2484 MHz IL (target <2.5 dB), 5 GHz rejection (>40 dB)
- 5 GHz BAW filter: Group Delay view — verify <5 ns ripple across 160 MHz channel BW
- WiFi diplexer (2.4+5 GHz): Load .s3p → extract path1 (2.4 GHz) and path2 (5 GHz) → compare on same chart
- WiFi LNA (dual-band): S21 gain at 2.4 and 5.5 GHz, S11 match at both, S12 isolation
- Dual-band antenna: Load .s1p → VSWR view → verify <2:1 at both 2.4 and 5 GHz bands
WiFi 6E (6 GHz) Specific Challenges
6 GHz band (5925–7125 MHz): wider than previous WiFi bands Supporting 320 MHz channels requires extremely low filter IL BAW filter target for WiFi 6E: IL <2.5 dB across 5925–7125 MHz (1200 MHz wide!) Group Delay ripple <5 ns over any 320 MHz sub-band Shape factor: sharp transition from UNII-5 to cellular C-band Load WiFi 6E BAW .s2p → BW Marker → verify 1200 MHz bandwidth coverage Group Delay across full 6 GHz band → check flatness over 320 MHz blocks
RF View WiFi Analysis: Load 2.4/5/6 GHz filter and LNA .s2p files for complete WiFi frontend qualification. Compare SAW vs BAW performance on same chart. Group delay verification for high-order QAM modulation. Free on Android.