How Wi-fi and Wireless Communication work?
How Wireless Transmission Works?
How many of us really understand what goes on when you text your friend across the ocean.
Allow me to entertain you with a little thought experiment. When you press "SEND" on your favourite massaging app, where's your message really "Into The Air", you'd say, "like radio waves.." When you press send on whatsapp, you're essentially sending instructions to your mobile processor via tiny copper wires on a printed circuit board in your smart phone. Now, these instructions are essentially electrical impulses, right? And electrical impulses are just electrons flowing along the potential difference. How exactly does your message "jump" into thin air from being electron flows in copper.
At one stage you had a circuit board that you could touch and feel (and even smell) and then suddenly you have radio waves in the invisible part of the spectrum, flying What's in between is this odd looking device: It's an antenna, which translate to a "Pole" An antenna is a metal-tongued voodoo device that swallows electrical impulses and spits It is silent as the dead, but its screams can be heard for miles.
Specifically, a Wi-Fi antenna like in the picture, screams at 2.4 Ghz (2 billion beats per second) and spits out waves of length 12.5 centimeters. Unlike visible light, these waves can pass through walls, and even bend around the corners!
How Does An Antenna Produce Radio Waves?
Before we answer this question, let's take a small detour. Do you remember the recent buzz in pop-science about gravitational waves? They're basically fluctuations in gravitational field, propagating as radiant energy. Einstein's general relativity predicted their existence a hundred years ago, and we've Just like gravitational waves, electromagnetic waves are fluctuations in electromagnetic. And, not much unlike the story of gravitational waves, the existence if invisible electromagnetic waves was predicted by Maxwell's equations well before their discovery by Heinrich Hertz! So, to produce radio waves, you need to create fluctuations in electromagnetic field. And to create those fluctuations, you need electrons moving around in a conductor!
The act of radio waves synthesis is a carefully choreographed, rhythmic dance of electrons Like perturbations in still water that radiate outward from the point of disturbance, the electron flows in an antenna cause perturbations in electromagnetic field which radiate out.
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