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Related Concept Videos

Reflection of Waves01:07

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Surface wave reflection from a metasurface termination.

S J Berry1, A P Hibbins2, J R Sambles2

  • 1QinetiQ Ltd., Cody Technology Park, Farnborough, GU14 0LX, UK. sjberry@qinetiq.com.

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Summary
This summary is machine-generated.

This study investigates microwave surface wave reflection at metasurface terminations. Results show reflection depends on momentum mismatch and field distribution differences between surface and propagating waves.

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Area of Science:

  • Electromagnetics
  • Metamaterials
  • Surface Waves

Background:

  • Metasurfaces offer unique electromagnetic properties.
  • Controlling surface waves at metasurface edges is crucial for device design.

Purpose of the Study:

  • To explore the reflection coefficient of microwave surface waves at metasurface terminations.
  • To compare two distinct metasurface types: metallic patch arrays and Sievenpiper 'mushroom' arrays.

Main Methods:

  • Experimental measurement of surface-wave reflection spectra.
  • Comparison with analytic theory and numerical modeling.
  • Analysis of two metasurface structures: square metallic patches and Sievenpiper 'mushroom' arrays.

Main Results:

  • The reflection coefficient is influenced by momentum mismatch between surface and freely propagating modes.
  • Field confinement differs between the two metasurface types, affecting wave behavior.
  • Measured spectra align with theoretical and numerical predictions.

Conclusions:

  • Metasurface design significantly impacts surface wave reflection.
  • Understanding momentum mismatch and field distribution is key to controlling reflected waves.
  • The Sievenpiper 'mushroom' array exhibits enhanced surface wave confinement.