A passive cellular system is a type of wireless communication system that uses a network of passive reflectors to provide coverage over a large geographic area.
Unlike active cellular systems, which use base stations that actively transmit and receive signals, passive cellular systems rely on passive reflectors that reflect signals to mobile devices.
Passive cellular systems are based on the principle of signal propagation, which states that radio waves can be reflected by objects in the environment. By strategically placing passive reflectors, such as walls, buildings, or even vegetation, a passive cellular system can create a network of “virtual” base stations that can provide coverage over a wide area.
One of the key benefits of passive cellular systems is their ability to provide coverage in hard-to-reach or remote areas.
Since passive reflectors do not require power or a connection to a central network, they can be placed in areas where it is difficult or impossible to install active base stations.
This makes passive cellular systems ideal for providing coverage in rural areas, natural disasters, and other emergencies.
Another benefit of passive cellular systems is their low cost. Since passive reflectors do not require power or a connection to a central network, they are much less expensive to install and maintain than active base stations. Additionally, passive cellular systems do not require a license to operate, which can also save on costs.
Passive cellular systems can also be used to enhance the coverage of existing active cellular systems.
By strategically placing passive reflectors, a passive cellular system can create “virtual” base stations that can improve coverage in areas where the active cellular system is weak or non-existent.
Passive cellular systems have some limitations too.
Passive reflectors are dependent on the environment, and their effectiveness can be affected by factors such as terrain, weather, and the presence of other objects in the environment.
Additionally, passive cellular systems are not as reliable as active cellular systems, and their coverage may be limited in certain areas.