There are two different concepts of radio waves behavior which are given below such as Gain, Loss.
Here are some simple concepts that are necessary to your understanding of RF and hence your ability to design, installs, and administers your wireless network. You need to understand the concept of gain, loss, reflection, refraction, diffraction, scattering, absorption, and free space loss.
Gain
Gain describes an increase in a radio frequency signal’s amplitude. Usually, gain is an active process. This means that you can use an external power source (such as an antenna) to amplify a signal, or you can use a high-gain antenna to focus the beam width of a signal to increase its amplitude.
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Bluetooth is a short-range radio link which enables devices to communicate 
between them in the speed of 2.45 GHz ISM band. All of the transmissions are synchronized to the timeslot of 625 microseconds and controlled by one Bluetooth device called as master devices so there is also concept of master and slave devices. There is another concept of Bluetooth that there is about seven slave devices which can be communicate with a piconet. They can share same channels with the help of single piconet at same time. Bluetooth uses the shaped binary frequency modulation with a symbol rate of 1 Ms/s. All the slave devices are addressed by a master device.
Wireless Local Area Networks (WLAN) technology adopted by more and more educational institutes, in homes, businesses and now in every where you can find in public areas. Because of its flexibility and due to reduction in the cost of wires consumers are happy to employ this technology. According to recent survey millions were updated their way of networking because it’s cheapest ad comparing to wired networking technology. It also encouraged due to the upcoming standards.
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