Broadband And High-gain Metamaterial Microstrip Antenna

Metamaterial is now a very hot topic in Electromagnetics and microwaveengineering area. However, due to high loss and narrow bandwidth limitations, theapplication of the negative media has always been developing slowly. Metamaterialantenna is very promising to achieve practical application of breakthrough researchareas. This thesis is targeting on design broadband high-gain metamaterial antenna withbetter performances. The work in this thesis will cover from electromagnetic theory,numerical methods, dispersion analysis, and antenna engineering.The basic theory of metamaterial is introduced, some of the unique characteristicsof metamaterial is derived from the Maxwell equations. And the limitation ofmetamaterial is derived from the conservation law. Then transformation optics and theapplication of cloaking device are introduced.A dispersive FDTD method for left-handed materials is introduced, andelectromagnetic characteristcs of left-handed materials is analyzed using thi method.Derived from personal experience on numerical method programming, some specificguidance is given for data structures and redundancy cleanup methods. And two simpleparallel computing acceleration method is introduced.The basic composited left/right handed transmission line theory is introduced, andthe difference between CRLH and resonant type metamaterial is defined fromfundamental physical aspect. Detailed HFSS software eigenmode solver usage isintroduced, and several structure is studied using this method. Dispersion characteristicof the structures are analyzed, then a novel simple structure is proposed.a broadband high-gain metamaterial antenna is analyzed. And by using the novelstructure proposed, along with several antenna tuning techniques a series of enhancedantennas are proposed. Among them, Type IV antenna has a bandwidth of13GHz,which is a almost three-fold increase compared with3.2GHz bandwidth for theprototype antenna. While its radiation characteristics very well in the end-fire direction,and in general the radiation capacity of this antenna will fit the requirements of moderncommunication system, shows a very broad application prospects.