The Global Positioning System (GPS) is a satellite-based navigation system that was developed by the U.S. Department of Defense (DOD) in the early 1970s. Initially, GPS was developed...
The name Cellular Phone is derived from the partition of a Geographic Region into smaller areas which are called “Cells”. The Voice and data exchanged between the Mobile...
The optical fibre is the medium for carrying the information from one point to another in the form of light. A basic fiber optic system consists of a...
Sony Ericsson T39m cell phone was the first GPRS enabled phone in world. General Packet Radio Service (GPRS) allows information to be sent and received across a mobile...
Wi-Fi stands for Wireless Fidelity. It is a wireless-based transmission of Internet signals in a form of a radio wave at spot frequency of 2.4 or 5 GHz...
Bluetooth is a low cost, low power, radio interface standard for wireless communication over short distances. It’s an open standard for allowing intelligent devices to communicate with each...
When light is passed through a prism, it is separated into all colors of rainbow, which is known as visible spectrum. Theory of EM spectrum There are some...
Infrared waves have very short wavelengths, which are longer than the visible light at 0.74 micrometers, and extending conventionally to 300 micrometers. These wavelengths correspond to a frequency range...
This part of the Radio Spectrum has wavelengths such short that they are easily absorbed by water and this is the core principle that they are used in...
Radio waves are waves with wavelengths longer than infrared light. Like all other electromagnetic waves, they travel at the speed of light. The lightning and astronomical objects produce...
