1. Tell about wireless technology with the help of infrared and Bluetooth technology and also discuss the function of Wi-fi, GPS and 4G technology
Answers
WIRELESS COMMUNICATION
Wireless communication is the transfer of information or power between two or more points that are not connected by an electrical conductor. The most common wireless technologies use radio waves. With radio waves distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications include the use of other electromagnetic wireless technologies, such as light, magnetic, or electric fields or the use of sound.
In a first, a British technology start-up has invented a multi-function antenna for laptops that combines Wi-Fi, GPS, bluetooth, 3G/4G LTE and WiGig -- multi-gigabit per second wireless speed -- in one unit.
Developed by scientists from University of Birmingham, the new SAT antenna fits into the extremely limited space of the hinge cavity and replaces as many as five separate antennas found in a standard laptop.
Sampson Hu, who founded SAT in 2013, said that conventional antennas cannot be located immediately next to each other because of signal interference which leads to reduced performance.
“Within the current laptop, the antennas for Wi-Fi or a mobile signal need to be separate so there is no interference of frequencies. If the laptop has a metal casing then it is impossible to embed an antenna on the top of laptop screen or motherboard and the antenna must sit in the hinge cavity,” Hu said in a university statement.
However, the hinge cavity is a very limited space in which laptop manufactures can only fit two conventional antennas, one for Wi-Fi and one for 3G/4G LTE. If conventional antennas are brought so close together interference degrades efficiency and increases battery usage, Hu added.
Hu also noted that if a laptop has metallic covers, there is no other space to locate the second conventional Wi-Fi antenna and 3G/4G LTE antennas to support Multi-Input-Multi-Output (MIMO) function to provide enhanced data download rates.
“That is the problem we have overcome with our integrated MIMO antenna system. All the antennas are combined together as one single system,” Hu said.