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Distributed Antenna Systems


A distributed antenna system (DAS) is a network of separate antenna modules connected to a master unit to provide wireless communication service to a specific location.

A DAS can be indoors (iDAS) to provide improved cellular connectivity throughout a building, or outdoors (oDAS) to enhance connectivity in areas where coverage is unreliable.

Distributed Antenna Systems

Illustration of a distributed antenna system

DAS extends network availability through spaced antennas that offer coverage without overlapping. All antennas in a DAS network are extenders connected to a central controller, which is then connected to a carrier’s transceiver.

DAS uses several signal distribution methods, including:

  • Passive DAS: Uses coaxial cables to distribute signals from an antenna across a building or target area, along with components like splitters and couplers.
  • Active DAS: Transmits signals from an external antenna to other antennas within the system through optical cables, while boosting and amplifying the signals.
  • Hybrid DAS: Separates the remote radio units (RRUs) from the antennas, allowing the system to use both coaxial and optical cables.
  • Digital DAS: Connects directly to a master unit via a Base Band Unit (BBU), bypassing analog and digital conversions.

Note: The radio frequency spectrum covered by a DAS is usually licensed to a wireless carrier. Thus, setting up a DAS requires involvement of a carrier, making deployment the most expensive stage of a DAS project.

Example of Distributed Antenna System in a sentence

"Distributed antenna systems are essential for providing necessary coverage in areas with high network usage such as busy sports stadiums."

Synonyms: DAS

Related Terms for Distributed Antenna System