期刊名称：International Journal of Innovative Research in Computer and Communication Engineering
印刷版ISSN：2320-9798
电子版ISSN：2320-9801
出版年度：2015
卷号：3
期号：8
DOI：10.15680/IJIRCCE.2015. 0308013
出版社：S&S Publications
摘要：Circularly polarized (CP) antennas are widely used in modern wireless communication systems becauseof their immunity to multipath distortion and polarization mismatch losses. On the other hand, unidirectional radiationpatterns are generally desirable since they can provide larger signal coverage and stabilize the signal transmission. As aresult various Omni directional CP antennas have been proposed and investigated over the past few years. The designutilizes two monopole modes of a circular patch which connects to a modified ground plane by a set of conductive pins,to achieve wide-band impedance matching. The curved branches introduced at the edge of circular ground plane excitea degenerate mode and create CP fields. To verify the design, a prototype should be fabricated operating at 2.4GHz-WLAN band and measured reflection coefficient, radiation pattern, and antenna gain should agree well with simulationresults. In this paper simulation carried out using arlonAD320A instead of RogersRT/duroid 5880 because cost ofRogers material is very expensive. But losses in arlon material are more. The losses are reduced by decreasing numberof shorting pins and increase the radius of shorting pins. The prototype as a low profile 0.024𝜆0, a return loss value -30dB and a antenna gain of 4.68dB. To further characterize the design concept, a parametric study of the antenna iscarried out using HFSS.
