Research On The Design And Analysis Of MIMO Antenna For RF

The incessant demand for wireless capacity over the past two decades is pushing the lower radio frequency(RF)spectrum to its limits.As a result,wireless communications at higher frequencies,which can provide tremendous bandwidth,have recently attracted much attention.Because spectrum is an extremely valuable resource,operators are now implementing new wireless systems on higher cellular bands.The most commonly tested and recently deployed band is n78(3500MHz),also known as the 5G 3.5 GHz band or 5G C-band.One rationale for the success of the n78 band is its high availability,as the lower end of the cellular spectrum is already being used by 3G and 4G networks.On the other hand,there are natural limitations to the coverage and connectivity of the n78 band due to the propagation characteristics of higher frequencies,but this effect can be mitigated to some extent by wireless technologies such as MIMO.Toward solving coverage and connectivity problems in wireless systems,finding the feasible antenna structure is a key step.Communications systems engineers have made continuous efforts to develop low-cost,lightweight,and low-profile antennas capable of high-end performance across a wide frequency spectrum.This technological trend has led to a great deal of attention being paid to the development of a microstrip patch antenna design.In this thesis,gain and bandwidth enhancement of patch antennas is studied.The research content is mainly divided into the following two parts:A high gain patch array is developed,that adverse the effect discontinuities in microstrip lines.The design and realization of the single-layer,rectangular patch array is proposed using the parallel feed network.The 2x4 microstrip patch antenna array is designed using Rogers RT/Duroid 5880 as substrate with height 1.575 mm,dielectric constant of 2.2 and loss tangent of 0.0009.A prototype of the single patch element and the eight-elements array are fabricated to validate simulated results.The results show that the antenna array exhibited a peak gain of 16.2d B and a3 d B beamwidth of 19 degree.Analysis of results reveal the fact that,by using array,the performance of an antenna can be easily enhanced.The 10-d B bandwidth of the array covers from3400 MHz to 3520 MHz making it suitable for Band n78 5G access points application.Research and design of two element UWB-MIMO Antenna with modified ground stub.This study aims to address the bandwidth limitation in patch antennas,and for this purpose,a UWB patch antenna has been designed.The proposed structure is then used to perform the analysis of a two-element MIMO antenna system.The single element antenna can be described as an altered variant of the rectangular microstrip antenna.Our antenna design consists of two radiating elements of identical geometry etched on a single FR4 substrate of 1.6 mm height.A relative permittivity of the substrate is 4.4.A 50? microstrip line feeds each patch element separately.In terms of size,the MIMO antenna has a reduced size of 20 mm × 32 mm.The MIMO system can be used for high data rate transmissions and short-range communication devices such as wireless personal area networks.The proposed MIMO antenna system has an operating range of 4.07 to10.03 GHz.