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First of all we have to consider the relationship between current flowing in a twin wire conductor, its resultant magnetic field, the EMF and the electric field between the conductors. The current flow produces a magnetic field that exists at right angles to it. Furthermore, a moving magnetic field will produce the reverse i.e. current. Additionally, the electric field produced by the EMF, exists at right angles to the magnetic field and the conducting surface. This relationship exists for DC, AC and Radio Frequencies (RF). It is essentially the 'golden rule', as electrical transmission cannot exist without these in place. Additionally, Nicola Tesla discovered that at frequencies at and above the radio spectrum, current does not exist throughout the cross-sectional area of the conductor - progressively only on the surface. This is known as skin effect. Thus at radio frequencies, if we shave the outside of a conductor and turn it inside out, the electro-magnetic wave moves along a metallic waveguide on the skin of the inner surface without the outer surface of the waveguide being affected i.e. acting as an insulator. The wave on the inside conforms to the requirements set out above: Current flows on the inside 'skin' at right angles to the magnetic field. This is known as wall current. An electric field exists at right angles to the magnetic field and the conducting surface. The waveguide is a rectangle and its dimensions are designed to support particular wavelengths. The wave formation inside is composed of alternating 'H' loops (magnetic filed) and 'E' diamonds (electric field). Extraction of the energy is only possible by providing an interruption to the wall currents. A slot cut at 90 degrees across the wall currents produces the greatest coupling and therefore the strongest output. It is possible to have a rectangular slot in a waveguide transmitting at great powers without any output i.e. its longer length aligns or is parallel with the wall currents. So the output can be controlled from provided a slot with no output at zero degrees to maximum output when a slot cuts the wall currents at 90 degrees. In summary, as long as the basic rules are met, as described in the first paragraph, a waveguide can transmit energy along its length.
What else can I help you with?
What do electromagnetic waves transmit?
Electromagnetic waves transmit energy and information through the interaction of electric and magnetic fields.
What forms of electromagnetic energy can transmit through glass?
Electromagnetic energy in the form of visible light, ultraviolet light, and infrared radiation can transmit through glass. These wavelengths are able to pass through the structure of glass due to their specific properties and frequencies.
What do electromagnetic waves carry and how do they transmit energy and information?
Electromagnetic waves carry energy and information through the transfer of electric and magnetic fields. They transmit energy by oscillating between electric and magnetic fields, and information by varying their frequency or amplitude.
What property of electromagnetic waves makes it possible to use waves to transmit information between a space shuttle and NASA mission control centers on the ground?
Mainly the fact that such waves can travel through empty space.
How do we know that electromagnetic waves can travel through to vacuum?
Electromagnetic waves are a form of energy that does not require a medium to travel through, so they can propagate through a vacuum. This is due to the nature of electromagnetic fields, which can self-propagate and do not rely on particles to transmit the wave. This property has been extensively demonstrated through various scientific experiments and observations, affirming that electromagnetic waves can travel through a vacuum.
What is a sentence for radio energy?
Radio energy is used to transmit signals from one location to another through waves in the electromagnetic spectrum.
What is the use of conductor in waveguide when em energy propagates through the dielectric material?
A brilliant question. The electromagnetic field is what carries the energy in any electrical circuit. Electrons carry neither information nor energy, but they provide the necessary field to propagate electromagnetic energy. Weird huh?
Is it possible for a electromagnetic wave to travel through a vacuum?
yes, they can travel.
How do electromagnetic waves carry energy?
Electromagnetic waves carry energy through oscillating electric and magnetic fields that propagate through space. The energy is transferred as the waves travel, allowing them to transmit information and power over long distances.
What will happen if the signal frequency is greater than cut-off frequency in a waveguide?
If the signal frequency exceeds the cut-off frequency in a waveguide, the wave will not propagate through the waveguide and will be attenuated. This is because the waveguide is designed to support only certain modes of propagation, and frequencies above the cut-off do not satisfy the waveguide's mode conditions. Instead, the signal will either reflect back or be absorbed, leading to a loss of signal strength.
Is HIV can transmit through the eyes?
Although the risk is lower than other methods of transmission, it is possible.
What is the difference between mechanical and electromagnetic waves with regard to travel?
Mechanical waves need some kind of material to transmit through. They involve the shaking and passing of energy through matter. Electromagnetic waves don't need a medium to travel through. Outer space is considered a vaccuum, there is no matter to shake back and forth to create a wave. This is why electromagnetic waves can travel through solids, liquids, and why they travel faster.
