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*”micro-waves” are a form of ‘electro-magnetic radiation’ with ‘wavelengths’ ranging from ‘1 meter’ – 1 ‘millimeter’) / with ‘frequencies’ between ‘300 MHz’ (aka ‘100 cm’) – ‘300 GHz'(aka ‘0.1 cm’)*
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(this broad definition includes both ‘UHF’ + ‘EHF’ (‘millimeter waves’), and various sources use different ‘boundaries’)
(in all cases, ‘microwave’ includes the entire ‘SHF band’ (‘3′ to ’30’ GHz, or 10 to 1 cm) at a ‘minimum’, with ‘RF engineering’ often restricting the ‘range’ between ‘1’ and ‘100 GHz'(‘300’ and ‘3 mm’).
(the prefix micro- in microwave is not meant to suggest a ‘wavelength’ in the ‘micrometer’ range)
(it indicates that microwaves are “small”, compared to ‘waves’ used in typical ‘radio broadcasting’, in that they have shorter ‘wavelengths’)
(the boundaries between ‘far infrared’ / ‘terahertz radiation’ / ‘microwaves’ / ‘ultra-high-frequency radio waves’ are fairly ‘arbitrary’ and are used variously between different ‘fields of study’)
(beginning at about ’40 GHz’, the ‘atmosphere’ becomes less ‘transparent’ to ‘microwaves’, at lower ‘frequencies’ to ‘absorption’ from ‘water vapor’ and at ‘higher frequencies’ from ‘oxygen’)
(a ‘spectral band structure’ causes ‘absorption peaks’ at ‘specific frequencies’)
*INSERT “GRAPH”*
(above 100 GHz, the ‘absorption’ of ‘electromagnetic radiation’ by earth’s atmosphere is so ‘great’ that it is in effect ‘opaque’, until the ‘atmosphere’ becomes ‘transparent’ again in the so-called ‘infrared’ and ‘optical window’ frequency ranges)
(the term microwave also has a more ‘technical’ meaning in ‘electromagnetics’ and ‘circuit theory’)
(‘apparatus’ and ‘techniques’ may be described qualitatively as “microwave” when the ‘frequencies’ used are ‘high’ enough that ‘wavelengths’ of ‘signals’ are roughly the same as the ‘dimensions’ of the ‘equipment’, so that ‘lumped-element circuit theory’ is inaccurate)
(as a ‘consequence’, practical ‘microwave technique’ tends to move away from the ‘discrete resistors’, ‘capacitors’, and ‘inductors’ used with ‘lower-frequency radio waves’)
Instead, ‘distributed circuit elements’ and ‘transmission-line theory’ are more useful methods for ‘design’ and ‘analysis’)
(‘open-wire’ and ‘coaxial’ transmission lines used at ‘lower frequencies’ are replaced by ‘wave-guides’ and ‘strip-line’, and ‘lumped-element tuned circuits’ are replaced by ‘cavity resonators’ or ‘resonant lines’)
(in turn, at even higher ‘frequencies’, where the ‘wavelength’ of the ‘electromagnetic waves’ becomes ‘small’ in comparison to the ‘size’ of the ‘structures’ used to ‘process’ them, ‘microwave techniques’ become ‘inadequate’, and the methods of ‘optics’ are used)
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👈👈👈☜*“NON-IONIZING RADIATION”* ☞ 👉👉👉
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥