The Limitations of Traditional Indoor Distributed Antenna Systems for Mobile Signal Blocking

An Outdated Approach with Multiple Drawbacks

In recent years, traditional indoor distributed antenna systems (DAS) have been criticized for their limitations in effectively blocking mobile signals. This article aims to shed light on the drawbacks of this outdated approach and highlight the need for more advanced solutions in the field of mobile signal blocking.

The Inefficiency of Traditional DAS:

Customers have reported that the previously installed traditional DAS, which relied on high-power mainframes and RF cables to transmit signals to designated areas, is no longer a viable option. This approach, once popular in China, has become increasingly rare due to its inefficiency and outdated nature.

Challenges Faced by Traditional DAS:

  1. Signal Attenuation: The use of a single high-power mainframe to combine multiple frequency bands into one or two RF cables results in significant signal attenuation. Factors such as cable losses and connector errors further contribute to the degradation of signal quality.
  2. Limited Terminal Capacity: The number of transmission antenna terminals is restricted when using a single mainframe. Typically, no more than twenty terminals can be accommodated by one mainframe, severely limiting the scalability of the system.
  3. Antenna Requirements: The merging of multiple frequency bands places high demands on the antennas used in traditional DAS. It becomes challenging to achieve optimal performance across a wide frequency range, making it difficult to maintain good standing wave transmission characteristics.

The Ineffectiveness of Traditional DAS:

Despite the use of high-power mainframes, the final outcome of the traditional DAS approach is comparable to that of conventional low-power signal blocking devices. The signal distribution achieved through multiple levels of allocation only results in a cellular-style deployment, lacking the desired efficiency and effectiveness.


The limitations of traditional indoor distributed antenna systems for mobile signal blocking have become increasingly apparent. The use of a single high-power mainframe, signal attenuation issues, limited terminal capacity, and antenna requirements have rendered this approach outdated and ineffective. As mobile frequencies and standards continue to expand, it is crucial to adopt more advanced solutions that can efficiently block signals across a wide range of frequencies.