V-Band
Understanding V-Band
V-band encompasses the oxygen absorption peak near 60 GHz, which creates a unique propagation environment. While the high atmospheric attenuation limits range, it also provides inherent security (signals are absorbed before reaching unintended receivers) and dense spatial frequency reuse.
V-Band Characteristics
- Atmospheric absorption: 15 dB/km at 60 GHz (oxygen). Drops to 0.5 dB/km at 40 and 75 GHz.
- 60 GHz (unlicensed): Up to 14 GHz of bandwidth available worldwide. Used for WiGig, short-range backhaul.
- Antenna size: Half-wave dipole at 60 GHz = 2.5 mm. Very compact high-gain arrays possible.
V-Band Applications
- WiGig (802.11ad/ay): Multi-gigabit wireless at 60 GHz. 7 Gbps per channel.
- 5G backhaul: Short-range (< 1 km) high-capacity links between base stations.
- Satellite (Q/V): Next-generation satellite uplinks using 47.2-50.2 GHz for Ka/V gateway links.
Frequently Asked Questions
What is V-band?
V-band covers 40-75 GHz. It includes the 60 GHz oxygen absorption peak, which limits range but enables dense frequency reuse and secure communications. Used for WiGig, 5G backhaul, and satellite uplinks.
Why is 60 GHz special?
At 60 GHz, atmospheric oxygen absorbs RF energy at ~15 dB/km. This limits useful range to about 1-2 km but means signals are naturally confined, enabling frequency reuse every few hundred meters. 14 GHz of unlicensed bandwidth is available.
What data rates are possible at V-band?
With 14 GHz of available bandwidth at 60 GHz, data rates of 7-10 Gbps per channel are achievable using simple modulations. With advanced modulation (256-QAM), 20+ Gbps is possible. This supports multi-gigabit wireless for backhaul and high-speed data links.