Research On Miniaturized Leet-Handed Metamaterial Patch Antenna

Left-handed material, also known as the anisotropic material, or negativerefractive index material, we can classified it as metamaterial category. Left-handedmaterial is a new type of artificial electromagnetic media which appears in recentyears.It is characterized it has both negative permittivity and negativepermeabilityby in certain frequency band.To some conventional materials,therealization of negative refraction is unattainable. However,left-handed material caneasily achieve negative refraction of electromagnetic properties, which can be veryuseful in sensors, phase shifters, couplers, filters, resonators, radar and other fields.Left-handed material is introduced into the design of microstrip patchantenna,which aims to construct Left-handed material patch antenna with lowprofile, miniaturized size, and research novel antenna radiation patterns afterminiaturized.Center frequency of those patch antennas are set between L andP-band.In the design of Left-handed material miniaturized patch antenna, we did notadd any compelex matching network to achive Line impedance matching of theantenna, such as impedance converter,but directly use the microstrip line, makingthe model relatively simple.This paper introduces the theories on Left-handed material units and microstrippatch antenna, and organizes equivalent circuit models of split ring resonators.Thispaper mainly uses complementary split ring resonators etching to the groud to givebasic model of miniaturized patch antenna.Its operating characteristics are studiedand we focus on the various model parameters and analyse in detail on the antennaperformance.Secondly, following the results of the basic model,various construction of novelLeft-handed material miniaturized patch antennas are proposed.we also discuss theinfluence of the main model parameters which was simulated and optimized to thecharacteristics of antennas,and establish fast and basic methods to design antennas.Finally, the advantages of left-handed material patch antenna are summarized,and furture applications of those patch antennas are put forward.The proposed left-handed material miniaturized patch antennas meet therequirements of basic bandwidth,and available gain for specific need.Their Physicalsize are 25%-50% smaller than the original regular patch antenna,and they achievethe expected miniaturization. Besaed on them, we designed multi-forms ofleft-handed material patch antennas, to meet specific needs.For example,by addingsubtle adjustments to the frequency and achieving dual-band or multi-operation frequency , even widening frequency bandwidth. Each form of the antennas all hasrespective characteristics.In this paper, with various antennas covering a wide exposition of styles,we notonly elaborate working mechanism of left-handed material miniaturized patchantenna, but also process foreshadowing for practical machining.This content canprovide the basis and detailed theory for development of left-handed material, andcan also provide reference for other researchers.