Research On Technology Of Circularly Polarly Microstrip Antenna

Nowdays circularly polarized technology is one of important branchs in the microstrip antenna of field , it is used in the communications and electric antagonizes. In this thesis, basing on developing trends of circularly polarized technique about microstrip antenna in the world, firstly basic structure and radialization speciality of triangular microstrip antenna are introduced; secondly it is depicted how to carry on circularly polarized microstrip antenna; again, analyzing aperture-coupled technique of microstrip antenna, There are based upon single layer equilateral triangle, by aperture-coupled manner, a novel prototype of triangular microstrip antenna feed by aperture-coupled is introduced, axial ratio bandwidths of less than 3db which is approximately 2.5% in the paper. And then, excavating a cross- aperture in the center of triangular patch surface again, and that else of antenna structures go without change, it has been validated that antenna can carry on circularly polarized and minitypes by emluator, on the base of this, mostly effect in width and length of aperture to antenna are studied carefully, along with the influence of dielectric cover to resonators frequency and bandwith of micrpstrip antenna; Finally, some photonic bandgap (PBG) structures are introduced in the microstrip antenna field , and then a periodic rectangular air-aperture is excavated in the grounding, by probe-fed technique, and the effect of antenna's property as circularly polarized bandwidth are depicted when PBG structures are applied for microstrip antennae.