DESIGN OF CIRCULARLY POLARIZED OMNIDIRECTIONAL BIFILAR HELIX ANTENNAS WITH OPTIMUM WIDE AXIAL RATIO BEAMWIDTH
نویسندگان
چکیده
منابع مشابه
Omnidirectional circularly polarized antennas – a small antenna perspective
1 Abstract—The paper discusses recent developments and challenges in the design of small omnidirectional circularly-polarized (CP) antennas. Although omnidirectional CP coverage is easily achievable using antenna arrays, it is just recently that small and low-cost antennas delivered this functionality. The paper addresses practical design problems for these antennas, not reported in previous pu...
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A broadband circularly polarized patch antenna with high gain and wide axial ratio beamwidths is proposed for ultra-highfrequency (UHF) RF identification (RFID) applications in this paper. The antenna is composed of a square patch, a feed network printed on the bottom side of the substrates and an antenna radome. The CP radiation of the proposed antenna is excited by four cylinder probes which ...
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A wide-beamwidth circularly polarized (CP) asymmetric microstrip antenna is proposed by etching four novel unequal fan-shaped notches at the vertexes of the square radiator. A bandwidth of 1.5% and beamwidth of 156◦ are well achieved for an axial-ratio ≤ 3 dB (3-dB AR) at the central frequency of 1.575GHz. To widen the bandwidth, the asymmetric microstrip antenna is further expanded with the co...
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ژورنال
عنوان ژورنال: Progress In Electromagnetics Research C
سال: 2013
ISSN: 1937-8718
DOI: 10.2528/pierc13022105