Distributed Antenna System DAS

- overview, summary, tutorial about the DAS, Distributed Antenna Systems technology used for gaining better coverage and using a lower power.

The concept of a Distributed Antenna System, DAS has many advantages in some applications. A Distributed antenna system, DAS is a network of antennas spaced apart from each other, but connected to a common source. In this way the DAS is able to provide wireless or radio coverage within a given area.

The idea of a distributed antenna system is being adopted increasingly as it enables a number of advantages to be gained. However this is at the cost of a larger more complicated system. Nevertheless, distributed antenna systems are being used in a variety of areas to enable the right coverage to be gained for several applications.

Although the concept of distributed antenna systems has been known about for many years, it is with the increased deployment of wireless systems within buildings and other difficult coverage areas that the idea of distributed antenna systems has come to the fore.


Distributed antenna system advantages and disadvantages

Advantages of using a distributed antenna system

  • Better defined coverage
  • Fewer coverage holes
  • Same coverage using a lower overall power
  • Individual antennas do not need to be as high as a single antenna for the equivalent coverage

Disadvantages of using a distributed antenna system

  • Higher cost as a result of additional infrastructure required
  • Possible greater visual impact in some applications as a result of greater number of antennas, although they are likely to be much lower in height.

Basic concept of a distributed antenna system

The basic idea behind the distributed antenna system is to utilise several different antennas over the required coverage area. Using this approach the overall power required is less because these more localised antennas can be placed more effectively for a small area, rather than having a single, larger antenna that is a compromise for the wider coverage needed. By adopting a distributed antenna system approach, this helps overcome the shadowing and penetration losses because a line of sight link is available more frequently. As a result the levels of absorption are lower and this means the overall power levels can be reduced.

By Ian Poole

Share this page


Want more like this? Register for our newsletter








Measuring up to the NB-IoT revolution Dr. Stamatis Georgoulis | Cobham Wireless
Measuring up to the NB-IoT revolution
There is a rapidly growing demand for making connections to all kinds of devices as the Internet of Things (IoT) starts to become a reality. Well over 10 different standards are already being proposed for these low-power machine-type communications (MTC) applications.
Training
Online - RF and Wireless Propagation: Key Concepts
Know and understand the basics of RF and wireless propagation

More training courses

Whitepapers
LTE Advanced Pro and Road to 5G
Chapter 1 of the new book by Dahlman et al on the latest cellular developments and current 5G status. Get this free download.

More whitepapers










Radio-Electronics.com is operated and owned by Adrio Communications Ltd and edited by Ian Poole. All information is © Adrio Communications Ltd and may not be copied except for individual personal use. This includes copying material in whatever form into website pages. While every effort is made to ensure the accuracy of the information on Radio-Electronics.com, no liability is accepted for any consequences of using it. This site uses cookies. By using this site, these terms including the use of cookies are accepted. More explanation can be found in our Privacy Policy