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2. Cellular repeater - Wikipedia

   en.wikipedia.org/wiki/Cellular_repeater

   A cellular repeater (also known as cell phone signal booster or cell phone signal amplifier) is a type of bi-directional amplifier used to improve cell phone reception. [citation needed] A cellular repeater system commonly consists of a donor antenna that receives and transmits signal from nearby cell towers, coaxial cables, a signal amplifier, and an indoor rebroadcast antenna.

3. Radio over fiber - Wikipedia

   en.wikipedia.org/wiki/Radio_over_fiber

   Electrical RF is directly connected to a TV or set-top box. 1550 nm is more popular because it has less losses in the fiber and by using fiber-optic amplifier known as EDFA it is possible to extend the transport distance. 1310 nm loses about 0.35 dB/km of optical signal, 1550 nm loses only 0.25 dB/km. Optical budget between transmitter and ...

4. In-Building Cellular Enhancement System - Wikipedia

   en.wikipedia.org/wiki/In-Building_Cellular...

   Below ground level, large buildings and high rises are examples where mobile phones are unable to properly reach the carrier's macro or outdoor network. In these environments, the in-building cellular enhancement system will connect to the carrier's signal source which is typically a bi-directional amplifier or a base transceiver station.

5. Power dividers and directional couplers - Wikipedia

   en.wikipedia.org/wiki/Power_dividers_and...

   Since hybrid circuits are bi-directional, they can be used to coherently combine power as well as splitting it. In figure 21, an example is shown of a signal split up to feed multiple low power amplifiers, then recombined to feed a single antenna with high power. [52] Figure 21.

6. Hybrid fiber-coaxial - Wikipedia

   en.wikipedia.org/wiki/Hybrid_fiber-coaxial

   In these coaxial networks, trunk amplifiers were placed along the trunk cables to maintain adequate signal levels in the trunks, [42] [43] distribution feeder cables could be used to distribute signals from the trunks into individual streets, [44] [45] [46] directional couplers were used to improve signal quality, [47] trunk amplifiers could be ...

7. Duplexer - Wikipedia

   en.wikipedia.org/wiki/Duplexer

   A duplexer is an electronic device that allows bi-directional communication over a single path.In radar and radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna.