A COMPACT FOUR ELEMENTS UWB MIMO ANTENNA WITH ON-DEMANDWLAN REJECTION
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A four elements frequency reconfigurable Ultra Wideband (UWB) multiple –input-multiple-output (MIMO) Antenna design; capable of rejection on-demand WLAN band ranging from 8 to 6.2 GHz. The proposed design consists of two U-shaped monopole UWB radiators and two circular slotted-monopole radiators .These monopole radiators are orthogonally with respect to each others to exploit polarization diversity. Whereas the PIN diodes are used to connect the band-stop design with the ground plane to introduce the on-demand band rejection feature. An isolation of better than 17 dB between the four UWB –MIMO elements is achieved in the 2.7 to 12 GHZ frequency range for the both PIN diodes biased and unbiased states.
2. Aims & Objectives
In high speed Wire-less communication technologies such as ; Wire-less Personal Area Networks . Ultra Wideband (UWB) multiple-inputs-multiple-outputs (MIMO) Antennas considered to be an integral part of communication system. However, WLAN signals (in 5.15-5.35 and 5.75-5.8225 GHz bands) may interfere with those of UWB (3.1-10.6 GHz) technology and causing detrimental effects. So; for this reason designers have used different techniques in band-reject UWB or UWB-MIMO Antennas [1-9] . in [1 ]slots have been used in the radiator to get the dual band notched characteristics . While in  a pair of slits has been inserted in the radiators to achieve the band-notched functionality. Moreover, related works in [3-5] insertion of stubs to reject the WLAN band and introduction of the polarization diversity to improve the isolation among the elements. An electromagnetic band gap structure has also been implemented to reject the WLAN band along with the band-stop filter for coupling suppression in . Rejection of WLAN band implemented using short stub and parasitic meander lines were inserted to reduce mutual coupling in  . In  , different type of resonators were used to attain the band-functionality and also polarization diversity between nearly placed elements was exploited to attain high isolation. Another technique in  involves insertion of stubs in the ground plane to mitigate the interference between the UWB and WLAN bands. Moreover, A k/2 length of open stub has also been used to the ground plane (55386.5mm2) of the Antenna having a large reflector size . Generally, Previous works dealing the band rejection either emphasized on rejecting the multiple bands or portion of the bands only permanently, Also, Most of the designs in the literature focus on the band rejection feature of two elements UWB MIMO antennas.
An antenna is a metallic device used for transmitting and receiving electromagnetic waves often referred to as radio waves . In other words antenna is a transducer that converts radio frequency current to electromagnetic waves that are then radiated into space and/or converts electromagnetic waves received from space into radio frequency current. Antennas usually find its application in television and radio broadcasting, radar, wireless LAN, mobile phones, space exploration etc. Antennas can either be Omni-directional or directional. Omni-directional antenna radiates equally in all directions whereas directional radiates more in one direction than in the other. In modern days antennas mostly serve as a directional device as they are required to optimize the radiation energy in required directions and suppress it in other directions . In order to improve the overall system performance of wireless communication a good antenna design is required.
3.2 MIMO (Multiple input, Multiple Output)
MIMO (multiple input, multiple output) is an antenna technology for wire-less communication in which multiple Antennas are used at both the source (transmitter) and destination (receiver) . The Antenna at each end of communications circuit are combined to minimize errors and optimized data speed. MIMO one of several forms of smart Antenna technology.
3.3 UWB ( Ultra-Wideband)
Ultra wideband (also known as ultra-wide band and Ultraband) is a radio technology pioneered by Robert A scholtz and others that can use a very low energy level for short range high bandwidth communication over a large portion of Radio spectrum . UWB has traditional applications in none-cooperative Radar imaging . Most recent applications target sensor data collection , precision locating and tracking applications.
4. Methodology of Project
Write methodology of project
i. Mathematical approach
ii. Software approach
iv. Expected results
4.1 Mathematical approach
A mathematical analysis will be presented to show the compact four elements UWB MIMO Antenna.
4.2 Software approach
I will implement this idea in Software. The software I am going to use are HFSS.
The results obtained from simulation are analyzed for the expected results and the results are also compared with the results of existing simple Antennas.
4.4 Result Expected
The expected outcomes from this research are as follows
i. Increased bandwidth
ii. Increased data speed.
iii. Minimize errors
5. Utilization of Project Results
This research idea will be used in applications which require high bandwidth and high data speed and minimum errors in small range communication.