Abstract:
Ultra Wide Band (UWB) technology has become attractive since the U.S.
Federal Communications Commission allocated the (3.1-10.6) GHz frequency
band for commercial UWB systems, it has become a favorable technology in
the wireless communication area. UWB has promising applications in shortrange,
high-data-rate transmission, medical imaging etc. Another challenge
faced by these systems is multipath fading which can severely degrade the
transmission quality. The use of multiple-input multiple output (MIMO) and
array technology is an effective solution to mitigate this problem and improve
the channel capacity and quality of wireless link.
Issues like Multi path effect and reduction in BER are catered with the help of
MIMO. This technique ensures high data rate. Therefore, a MIMO antenna
operating in the UWB is key technology for next generation. The transmission
capacity and reliability of a system can be improved by using diversity
techniques without increasing the bandwidth and power. Although UWB is
unlicensed band, there is interference due to coexisting narrow frequency
bands. To protect WLAN frequency band from interference notch is added
which act as filter.
An improved model is proposed to reduce isolation between different antennas
which occurs because of neighboring antennas. As a result return losses are
increased which are also catered.UWB also introduces interference on other
bands which is an important issue to be tackled. For these problems a notch is
added to avoid these loopholes.
