With the rapid development of modern wireless communication technology,more and more attention has been paid to circularly polarized(CP)antenna because of its advantages in reducing multipath interference,and it has been widely used in wireless communication,radar,satellite communication and other systems.Because of the wide frequency range of signals to be transmitted,it is required to use multiband or wideband CP antennas to transmit and receive signals.Microstrip antenna has the advantages of simple structure,low cost,convenient processing,low profile,flexible design and easy to implement the multiband and wideband CP mode,so it has been widely used and in-depth researches.This paper first introduces the research background and the basic parameters of circular polarization antenna.Then we discuss the basic technology of microstrip antenna to achieve circular polarization,and finally expound several improved technologies of microstrip antenna to achieve multiband and wideband CP.
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