Sequentially rotated gap-coupled variations of plus shape microstrip antennas for dual band circular polarized response

摘要

Plus shape microstrip antenna for circular polarized response is proposed which givesVSWR and axial ratio bandwidth of 960 MHz (～42%) and 101 MHz (4.97%),respectively. Using sequential rotation its gap-coupled variations are proposed fordual band circular polarized response. With patches gap-coupled along two coordinateaxis, an optimum dual band response showing axial ratio bandwidth of 97MHz (4.3%) and 313 MHz (10.7%), with VSWR bandwidth of nearly 1000 MHz(>40%) is obtained.