Dband

dband is a term that may refer to D-band, the millimeter-wave portion of the electromagnetic spectrum spanning roughly 110 to 170 GHz. The term is sometimes written as D-band or D band; lowercase "dband" appears in informal contexts or as a label in software or product names but is not the standard nomenclature in technical literature.

In frequency and propagation terms, D-band lies in the millimeter-wave region with wavelengths around 2.7 to 1.8 millimeters. Signals in this band can carry high data rates, but they experience significant atmospheric attenuation, especially due to oxygen and humidity at specific frequencies. Propagation is predominantly line-of-sight and highly directional antennas are commonly used to achieve sufficient link budgets. Practical deployments often require precise alignment, advanced packaging, and careful thermal management.

Applications and use cases for D-band include high-capacity wireless backhaul, short-range point-to-point communications, and research in imaging and sensing. The band is of interest to telecommunications researchers and industry pilots exploring gigabit-plus data rates for campus networks and fixed wireless access. It is also used in scientific instrumentation and spectroscopy in some laboratory settings.

Technology and challenges in D-band cover transceiver design, high-frequency semiconductor devices, and packaging that minimizes loss. Hardware must contend with high path losses, stringent phase noise requirements, and thermal dissipation. Regulatory allocations for D-band vary by country, with many regions offering fixed-service or experimental licenses to support R&D and pilot deployments.

See also: D-band, millimeter-wave, wireless backhaul, terahertz science.