understand radio waves - anandcontrol.com · 2020. 8. 18. · radio waves visible light....
TRANSCRIPT
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Understand Radio wavesANAND SYSTEMS ENGINEERING
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HOUSE CAFE SCHOOL
COLLEGE OFFICE MALL
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RADIO WAVES are traveling Electric and Magnetic Waves
1867
James Maxwell
1887
Heinrich Hertz
Predicted EM waves Confirmed EM Waves
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𝑚𝑎𝑔𝑛𝑖𝑡𝑢𝑑𝑒 𝑜𝑓 𝐸𝑙𝑒𝑐𝑡𝑟𝑖𝑐 𝑓𝑖𝑒𝑙𝑑
𝑚𝑎𝑔𝑛𝑖𝑡𝑢𝑑𝑒 𝑜𝑓 𝑀𝑎𝑔𝑛𝑒𝑡𝑖𝑐 𝑓𝑖𝑒𝑙𝑑= speed of light (3x108 𝑚/𝑠)
Electric Field
Magnetic Field
Magnitude
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Frequency (f) is number of
waves traveling in a Second .
Wavelength (λ) is defined as the
distance between two points of
similar cycles of periodic wave.
λ = 𝑆𝑝𝑒𝑒𝑑 𝑜𝑓 𝑙𝑖𝑔ℎ𝑡
𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦=
3 𝑋 108 𝑚/𝑠
𝑓
Properties
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Radio Waves
Visible Light
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Electromagnetic radiation
Photo credit : NASA
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Radio Wave Travelling properties
Radio waves , like all other EM waves, travel at the speed of light and don't require any medium to travel
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Electromagnetic spectrum
The entire range of frequencies of EM waves is called As Electromagnetic spectrum
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Sound Propagation
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Natural Radio Emissions
Credit: NASA/GSFC Wind Waves Michael L. Kaiser
One Day Radio Emissions of Solar system
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λ = 𝑆𝑝𝑒𝑒𝑑 𝑜𝑓 𝑙𝑖𝑔ℎ𝑡
𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦=
3 𝑋 108 𝑚/𝑠
𝑓
Calculate Length of Antenna
=3 𝑋 108 𝑚/𝑠
98.7 ∗106 ℎ𝑧
Wavelength = λ = 3.0374 m
For A Monopole Antenna You can select
quarter wavelength Antenna = 3.0374/4 = 0.76 meter
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Artificial Radio Emissions
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9 Khz to 400 Ghz
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AM Band RFID
13.56 Mhz
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Television frequency bands FM Radio
88Mhz to 108Mhz band
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In India , 335 MHz band
2G - 800Mhz / 1900Mhz band.
3G - 2100 MHz
4G - 850 MHz / 1900 MHz / 2300 MHz
5G - will use the existing 4g bands as
well as the 24-86 GHz
Mobile Phone Crane Radio Remote Control
Crane Radio Remote Control
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GPS - 1.57542 GHz / 1.2276 GHz band
2.4 GHz and 5ghz band
2.4ghz band
GPS(Global Positioning System) WIFI
Bluetooth
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Hidden Universe
small portion of the sky in visible light same portion of the sky with visible & radio light
The W50 “Manatee” Nebula shown in visible light (Left) and visible + radio light (Right)National Radio Astronomy Observatory
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STAR LINKKa & Ku Band
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