What are the advantages of D-band (110-170 GHz) for high capacity wireless backhaul?
D-band (110-170 GHz) offers several advantages for high-capacity point-to-point wireless backhaul. The primary advantage is approximately 60 GHz of available bandwidth, enabling single-link data rates exceeding 100 Gbps using 256-QAM modulation, roughly 10x the capacity of current E-band (70-80 GHz) links. Atmospheric attenuation at D-band is moderate (0.5-2 dB/km at sea level, similar to E-band), allowing link distances of 1-5 km. Compared to higher terahertz frequencies, D-band benefits from available InP and SiGe semiconductor technology that provides adequate transmitter power (10-100 mW) and low-noise amplification (5-8 dB noise figure). Several companies including Ericsson, Nokia, and startups are developing D-band backhaul products targeting initial deployment in 2026-2028.
D-Band Fixed Wireless Backhaul: Technology and Applications
D-band sits at the sweet spot between established E-band technology and experimental terahertz communication research.
Common Questions
Frequently Asked Questions
How does D-band compare to E-band for backhaul?
D-band offers 5-6x more bandwidth than E-band (60 GHz vs 10 GHz), enabling proportionally higher data rates. Atmospheric loss is slightly higher, and rain attenuation is 2-3x worse, reducing maximum link distance by 30-50%.
What antenna sizes are needed for D-band backhaul?
For a 2 km link at 140 GHz, antennas with approximately 40 dBi gain are needed, corresponding to about 25-30 cm diameter reflectors.
When will commercial D-band backhaul equipment be available?
Several companies have demonstrated prototypes, with initial commercial products expected in the 2026-2028 timeframe.
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