NANOANTENNAS – DETECTING THE VERY SMALL

Date: 2015-10-07; view: 502.

Working on the text

Ex.5. Pronounce the words correctly:

to propagate, electromagnetic, transmitter, embedded, location, circuitry, transmission, connection, accelerated, charge, alternating, electrons, receiver, transmitter, to oscillate, adjusting, modulating, frequency, amplitude, requirement, palladium, interaction, to alter, hydrogen, detectable, explosive, to absorb, hydride, structure, to scatter, intensity, to enhance, resonant.

Ex.6. Read and translate the following text into Russian paying special attention to the constructions of the Passive Voice and particles:

TEXT

How many ways can you think of to detect a single particle or atom? What uses would a tool that could do this have? The nanoantenna can! Read on to find out how and what uses it might have.

An antenna is a device used to propagate, receive, and/or transmit electromagnetic waves which can have information embedded within them. Most people think of radio waves when they think of antennas. Radio waves are just one type of electromagnetic wave. For example, a sound wave may be translated into an electronic signal that is sent to a transmitter (antenna). The antenna creates an electromagnetic wave that carries the original embedded sound information through the atmosphere or space around it. An antenna at a different location, receives the electromagnetic wave, sending it to circuitry (your radio) that then translates it to an electronic signal and then back to a sound wave.

Radio waves are used for wireless transmissions (such as from cell phone towers to the cell phone and wireless internet connections). The radio wave is created by an accelerated charge. This can be done using an alternating current circuit, which forces the electrons in the electrically conducting antenna (a transmitter or receiver) to move back and forth along the antenna. As they move back and forth they speed up and slow down and create an electromagnetic wave. The way in which they oscillate carries the embedded information.

For example, the signal can have information carried on it by adjusting or modulating the frequency of the wave. To do this, one alters how many times the oscillations occur per second. This is known as a frequency modulated wave or FM. Another way to embed information on a wave is to modulate the amplitude of the wave. To do this, one adjusts how far the oscillation goes back and forth. This is called amplitude modulation or AM. One of the important requirements of an antenna is that the antenna's length can be related to the wavelength of the electromagnetic wave that it is trying to transmit or receive.