| Summary: | 碩士 === 臺北城市科技大學 === 機電整合研究所 === 102 === In this thesis, three structures have been extensively studied that includes microstrip line fed loop antenna for circularly polarized (CP),coplanar waveguide (CPW) fed loop antenna for circularly polarized and CPW fedasymmetric patch antennafor circularly polarized. This thesis has provedthat the design of CPW-Fed CP antenna has better characteristics than the conventional microstrip one.It is the purpose of this thesis that the CPW-Fed circularly polarized antenna has been designed successfully with good characteristics.
From our experiments, the microstrip line fed antenna for circularly polarized by loop shows the return loss and 3 dB axial ratio bandwidth of 11.4% and 3.2% respectively. Subsequently,coplanar waveguide-fedantenna by asymmetric patch that demonstrates the return loss and return loss bandwidth of -33.86dB and 7.75% respectively. Finally, the coplanar waveguide-fedfed antenna for circularly polarized by loop results reveal the return loss and 3dB axial ratio bandwidth of 36.32% and 16.73% respectively. From the results above, the coplanar waveguide-fed loop antenna for circularly polarizedhas wider bandwidth and can be suitable for mobile communications applications.
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