Electromagnetic waves carry information through variations in their amplitude, frequency, or phase
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Reference and peer-reviewed sources establish that information is encoded in electromagnetic and radio waves through variations in amplitude, frequency, or phase.
Abstract
Electromagnetic (EM) waves are indispensable in modern telecommunications. Despite their essential role in modern technology, EM waves are considered to be an abstract concept by many students. In this activity, an inexpensive two-coil system was constructed in a teaching laboratory and used to demonstrate information transfer by non-sinusoidal EM waves. Twenty secondary school students were invited to try out a hands-on activity developed based on this system. The participants were divided into teams, with some members in each team encoding and transmitting a message using EM signals followed by other members receiving the signal and decoding the message. The message was encoded using different frequencies and amplitudes of the sinusoidal components in the EM signal. In this outreach activity, a significant number of participants was found to hold the misconception that all EM waves are sinusoidal. After this hands-on activity, the number of participants holding this misconception decreased.
Chiefly preceded by a descriptive word: modification of an electromagnetic wave or other oscillating carrier wave to apply a signal to it; an instance of this; also, the extent to which such a wave is modified; and the modified wave or signal.: ##* {{quote-book|en|year=2022|author=Elizabeth Rubio|chapter=Transmitting and Receiving Radio Waves|title=Understanding and Using Radio Waves|series=The Electromagnetic Spectrum|location=New York, N.Y.|publisher=w:Enslow Publishing|page=22|pageurl=https://books.google.com/books?id=IY5eEAAAQBAJ&pg=PA22|isbn=978-1-978514-86-7|passage=Modulation is the process in which information is encoded in radio signals. Modulation describes changing an aspect of the wave. There are two main types of radio modulation: amplitude modulation (AM) and frequency modulation (FM). In amplitude modulation the height (amplitude) of the wave is changed. In frequency modulation, the number of waves that pass a given point in a second is changed.}}
Extremely asymmetrical scattering of electromagnetic waves in gradually varying periodic arrays
This paper analyses theoretically and numerically the effect of varying grating amplitude on the extremely asymmetrical scattering (EAS) of bulk and guided optical modes in non-uniform strip-like periodic Bragg arrays with stepwise and gradual variations in the grating amplitude across the array. A recently developed new approach based on allowance for the diffractional divergence of the scattered wave is used for this analysis. It is demonstrated that gradual variations in magnitude of the grating amplitude may change the pattern of EAS noticeably but not radically. On the other hand, phase variations in the grating may result in a radically new type of Bragg scattering - double-resonant EAS (DEAS). In this case, a combination of two strong simultaneous resonances (one with respect to frequency, and another with respect to the phase variation) is predicted to take place in non-uniform arrays with a step-like phase and gradual magnitude variations of the grating amplitude. The tolerances of EAS and DEAS to small gradual variations in the grating amplitude are determined.
of another wave called the MODULATING WAVE . These variations can be amplitude , frequency , phase , or pulse. modulator, n. The component in pulse radar
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