Around corners. In open areas. Down hallways and mine shafts. And in places where aesthetics are important. An antenna system comprises numerous components, including the antenna, mounting hardware, connectors, antenna cabling, and, in some cases, a lightning arrestor. Table1 shows the primary categories of Wi-Fi antennas and describes their primary traits and use cases.
Table 1. With directional and omnidirectional antennas, low-loss cable, mounting hardware, and other accessories, you can customize your wireless solution to meet the requirements of even the most challenging applications. Indoor Dipole Antennas, Single Band 2. These include mounting brackets, antenna cables if not included with the antenna , and lightning arrestors.
Mobility Express-even better than before. Aironet vs. Available You are here: Home May Antenna Features and Components An antenna system comprises numerous components, including the antenna, mounting hardware, connectors, antenna cabling, and, in some cases, a lightning arrestor. With increased levels of high data being transferred, often driven by the use of video, the IEEE sought to keep a step ahead of requirements and ensure that Wi-Fi was able to meet the needs of users for the coming years.
The industry came to a substantive agreement about the features for the This gave many chip manufacturers sufficient information to get their developments under way. The draft was finalised in November with its formal publication in July Such was the anticipation of the standard, that many products became available on the market around the time of the standard launch as advance copies had been available for development and further work on the standard.
The idea behind the IEEE When To achieve this a number of new features that have been incorporated into the IEEE The major innovations are summarised below:. Although each of these new innovations adds complexity to the system, much of this can be incorporated into the chipsets, enabling a large amount of the cost increase to be absorbed by the large production runs of the chipsets. To provide the maximum data transfer speeds when all devices in the wireless network are operating on the When earlier devices enter the wireless network, the backward compatibility overhead and features are re-introduced.
As with Therefore operating a net in In view of the features associated with backward compatibility, there are three modes in which an By implementing these modes, These modes have a significant impact on the physical layer, PHY and the way the signal is structured. Orthogonal Frequency Division Multiplex, OFDM is a form of signal format that uses a large number of close spaced carriers that are each modulated with low rate data stream. The close spaced signals would normally be expected to interfere with each other, but by making the signals orthogonal to each other there is no mutual interference.
The data to be transmitted is shared across all the carriers and this provides resilience against selective fading from multi-path effects. The way the OFDM has been used has been tailored to enable it to fulfil the various requirements for These are called High Throughput, HT formats.
In addition to these HT formats, there is also a legacy duplicate format. In order to be able to carry very high data rates on the wireless LAN, often within an office or domestic environment, This gives the maximum use of the available bandwidth. MIMO is a form of antenna technology that uses multiple antennas to enable signals travelling via different paths as a result of reflections, etc.
Read more about MIMO technology. The As might be expected, the number of data streams and hence the overall data capacity is limited by the number of spatial streams that can be carried - one of the limits for this is the number of antennas that are available at either end. To give a quick indication of the capability of a given system or radio a simple notation may be used. Where a is the maximum number of transmit antennas or RF chains at the transmitter; b is the maximum of receive antennas or receive RF chains; and c is the maximum number of data spatial streams.
An example might be 2 x 4 : 2 would be for a radio that can transmit on two antennas and receive on four, but can only send or receive two data streams.
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