In-Building Cellular Repeater Explained

Cellular Signal Booster
Cellular Signal Booster
Cellular Repeater
Cellular Repeater

In-building cellular repeater systems can boost and increase the range of cellular signals within large buildings. They require proper system design and should be installed by certified professionals. There are 3 major components in this system, the outside antenna, amplifier and the inside antenna. This system basically captures a weak outside signal, amplifies it and retransmits to cellular devices; thereby giving better call quality and connectivity. Moreover, this system can also do the reverse and hence they are two-way devices.

Outside Antenna

This captures the signal from outside the building which is then transmitted to the amplifier, and its efficiency determines the quality of the input signal. There are omnidirectional antennas and they are useful for capturing the signal from different towers or service providers. Whereas, directional antennas are useful in focusing in one direction because they have higher gains. Therefore, they are used when you want to pick the strongest signal.


Amplifiers are the most important components of the repeater system because they amplify the outside signal that is rebroadcasted through the inside antennas. Besides, you should know that its performance is determined by key factors like Gain (dB), output power (Watts), frequency (MHz) and oscillation control.  Now, let us try to understand them in detail, and begin with the amplifier gain which measures the relative improvement over the input signal. Hence, a higher gain amplifier can cover a larger area and gives better performance. However, you should know that as the gain increases the separation between outside and inside antenna increases.

The output power is the measurement of power required when communicating with the service providers’ cellular tower. But, you must keep in mind that higher power is not necessarily better, and it is determined by the coverage area inside. Hence, the maximum output power will be restricted by the manufacturer or the service provider. The next is the frequency of the amplifier and it must match with that of the service providers carrier signal. Moreover, the frequencies are different between service providers and you must note it.

Last but not least, signal oscillation control is important because when both the antennas of the repeater system communicate with each other, they should not interfere with the cellular tower. Therefore, if the repeater system is not properly installed it can interfere with the service providers tower.

Inside Antenna

These communicate with the cellular devices inside the building and similar to outside antennas there are directional and omnidirectional antennas. Moreover, there are different types of inside antennas such as ceiling mount antennas and they are usually dome type that broadcast signal in 360 degrees and in every direction. The other type is wall-mounted antennas and they have higher gains and their coverage area is narrow and hence can transmit over longer distances.

These are the components used to build a cellular repeater system and consulting with the service provider will help you to choose the ideal cell phone service booster suitable for you.