Wireless Technologies
Introduction
The modern office or home, as far as electrical/electronic
appliances are concerned, differs primarily from one ten years
ago by the fact that wires have almost disappeared for all
practical purposes. Gone is the age of desks cluttered with
tangled wires. Today, except for power transmission wires, all
wires can be done away with. The internet is wireless, phones
are wireless, computer peripherals are wireless. The last
frontier, wireless power transfer, is soon about to be breached.
The time seems ripe for us to delve into the world of wireless
technologies, and the first logical question in this direction
seems to be to ask the exact definition of wireless.
What is wireless?
Put simply – a wireless technology is any technology in which
wires have been eliminated in areas where wires were required
before. Almost all wireless applications have been in the field of
communication (more specifically, in transferring signals and
not just communication between humans). Examples range
from radio and TV broadcasting to mobile phones, Bluetooth
and wireless LAN.
While almost all developments in this direction have been
made possible using electromagnetic waves (explained in detail
later), some very specific applications have also been developed
using ultrasonic (high frequency sound) and infrasonic (low
frequency sound) waves.
Before we go into how exactly wireless communication takes
place, let us take a brief look at its history.
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By Amrut Deshmukh
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