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Metamaterial-based Device Engineering--Andrea Al
Pages 99-104

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From page 99...
... In the past decade, metamaterials have opened several exciting directions in basic science, such as the realization of artificial plasmas at microwaves, artificial magnetism in optics, negative refraction, cloaking and extreme scattering manipulation, and large wave control over surfaces significantly thinner than the wavelength. These features not only are shedding light on fascinating new areas for basic research in optics, electromagnetics, acoustics, and beyond, but also are yielding important, direct applications in more applied engineering contexts.
From page 100...
... . Figure 1 shows a cloaked dipole antenna for cellular communications; it largely suppresses radar cross-section at all angles, compared to a bare dipole, while transmitting and receiving radio frequency signals with good matching and isolation performance over the entire cellular band.
From page 101...
... This symmetry, known as reciprocity, is due to the fact that wave propagation in conventional media, including light and sound, is time reversible. Reciprocity is not necessarily desirable, however, especially when one wants to isolate a source from its echo or separate signal flows travelling in opposite directions.
From page 102...
... Very large isolation (over 40 decibels) was realized for airborne acoustic waves using a suitably designed subwavelength acoustic ring cavity in which air was rotated simply by using fans, and the cavity was symmetrically coupled to three acoustic waveguides, which formed the input and output channels of the device.
From page 103...
... 2012. Overcoming mutual blockage between neighboring dipole antennas using a low-profile patterned metasurface.


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