Wireless Energy Transfer

Wireless power strategies fall largely into two groups, near-field and reach. Energy is transmitted over short distances in near–field or non–radiative techniques through magnetic fields using capacitive coupling between coils of wire, or by electric fields using capacitive coupling between metal electrodes. Inductive coupling is the most commonly used wireless technology; its uses include charging portable devices such as telephones and electrical toothbrushes, RFID tags, induction cooking, and wireless charging or continuous wireless power transfer in implantable medical devices such as cardiac artificial pacemakers or electrical vehicles.

Wireless Energy Transfer


The transmission of electrical energy as a physical connection without wires is wireless power transfer (WPT), wireless power transmission (WET), or electromagnetic power transmission. A transmitter device, powered by electric power from a power source, produces a time–varying electromagnetic field in a wireless power transmission system, which transmits power across space to a receiver device, which collects power from the field and supplies it to an electrical charge. Wireless power transmission technology will reduce the use of wires and batteries, thereby increasing the mobility, comfort, and protection for all users of an electronic device. Wireless power transfer is useful for driving electrical devices where interconnecting wires are uncomfortable, unsafe or not feasible.

Energy is transmitted by electromagnetic radiation beams, such as microwaves or laser beams, in far–field or radiative methods often called energy beaming. Such methods can hold longer distances of energy but must target the receiver. Solar power satellites, and wireless controlled drone aircraft are proposed applications for this type.

An important point involved with all wireless power systems is reducing exposure to potentially injurious electromagnetic fields by humans and other living things.

Wireless power transfer is a common term for the transmission of energy by means of electromagnetic fields in several different technologies. The technologies differ in the distance they can transfer power effectively, whether the transmitter has to be focused (directed) at the receiver, and in the form of electromagnetic energy they use: time-varying electrical fields, magnetic fields, radio waves, microwaves, infrared or visible waves.


Wireless Technologies

In the 19th century, the term wireless communication was coined, and wireless communication technology developed over the years that followed. It is one of the most critical means by which information is transmitted from one system to other. The knowledge can be transmitted through the air in this system without needing any cable, wires or other electronic conductors, using electromagnetic waves such as IR, RF, satellite, etc. Wireless communication technology currently applies to a range of wireless communication devices and systems ranging from smart phones to computers, tables, tablets, Bluetooth technology, and printers. This review covers all aspects of wireless communication and the wireless communication types.

Wireless communication system has become an essential part of different types of wireless communication devices in the present days, allowing users to communicate even from remote operating areas. There are several devices, like mobiles, used for wireless communication. Cordless telephones, applications for Zigbee wireless, GPS, Wi–Fi, satellite TV and wireless computer components. Current wireless phones include 3 G and 4 G networks, Bluetooth technology, and Wi–Fi.

IR wireless networking, satellite communication, broadcast radio, microwave radio, Wifi, Zigbee etc. are the some different types of wireless communication.


Satellite Communication

Satellite communication is one sort of self-contained wireless transmission technology, it is widely spread around the world allowing users to remain connected almost anywhere on earth. When the transmission is sent to near the satellite, the satellite amplifies the signal and returns it to the receiver of the antenna located on the earth's surface. Satellite communication requires two main components, such as the space and ground segments. The ground section consists of stationary or mobile transmission, reception and ancillary facilities, and the space segment, which is primarily the satellite itself.


Infrared Communication

Infrared wireless communication transmits information by IR radiation in a computer or network. IR is electromagnetic energy that is longer than that of red light at a wavelength. It is used for security control, remote TV control and communications within short range. IR radiation lies between microwaves and visible light in the electromagnetic spectrum. That way, they can be used as a contact source.


Broadcast Radio Communication

The first wireless transmission technology to seek widespread use is open radio communications, and this still serves a purpose nowadays. Handy multichannel radios allow a user to communicate on short distances, while citizen's band and maritime radios provide sailors with communication services. Ham radio listeners share their strong broadcasting equipment with data and work emergency communication aids in disasters, and can even transmit digital information over the radio frequency spectrum.

Radio waves are electromagnetic waves that are emitted by an antenna. Such waves have entirely different frequency segments, and by moving into a frequency segment, you will be able to receive an audio signal.


Microwave Communication

Microwave wireless transmission is an efficient method of communication, with this transmission mostly using radio waves and measuring the wavelengths of radio waves in centimeters. The data or information in this correspondence can be transferred using two methods. Another method is orbital, and another method is terrestrial.


Wi – Fi Communication

Wi–Fi is a low–power wireless networking, which is used by various electronic devices such as smartphones, laptops, etc. In this setup, a router operates wirelessly as a communication hub. Such networks require users to connect to a router only within walking distance.

Wi–Fi is very common in wirelessly accessible networking applications. For security purposes these networks need to be protected with passwords, otherwise they will be accessed by others.


Mobile Communication System

Generations elucidate the growth of the mobile networks. Most users communicate through mobile phones over a single frequency band. Mobiles and cellular phones are two examples of devices that use wireless signals. Cell phones typically have a wider range of networks to provide coverage. But there is a limited range of cordless phones. As with GPS devices, some telephones use satellite signals to communicate.


Bluetooth Technology

The primary purpose of the Bluetooth technology is that it helps you to wirelessly connect various electronic devices to a data transfer network. Hands–free earphones, joystick, and wireless keyboard are attached to cell phones. Bluetooth device uses the information from one computer to another. It system has different functions, and is widely used in the industry for wireless communication.


Remote Control

The omnipresent TV remote control is the top choice for ultimate best wireless device. It's so common we take that as a matter of course. Yet most of us use it a lot of times a day. The primary technology is still infrared (IR), but RF remote control is slowly giving way to that. Still, for years to come, IR will be with us, because it's cheap, easy and works well.


Advantages of Wireless Technology

Wireless communication applications include security systems, remote control over television, Wi-Fi, cell phones, wireless power transfer, computer interface devices, and other wireless communication based projects.

  • Some of the advantages of Wireless Transmission are stated as below,
  • Some data or information may be transmitted more quickly and at a high rate.
  • Maintenance and construction of these networks would cost less.
  • Wireless access to the internet can be made from anywhere.
  • With patients, physicians working in remote areas, it's very convenient as they can be in contact with medical centers.

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