Coplanar Waveguide fed Circular Polarization Slotted Annular Ring Monopole Antenna

• Main Authors: Jing-pei Yeh, 葉璟霈
• Other Authors: Tsen-chieh Chiu
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/96121392848674553596

碩士 === 國立中央大學 === 電機工程研究所 === 98 === The design and analysis of a planar, circularly polarized, and slotted annular ring monopole antenna are presented. In contrast to traditional planar circularly polarized patch antenna and slot antennas poised for narrowband applications, the presented antenna is of relatively broad operating bandwidth by exploiting the broadband monopole antenna structure. Specifically, the proposed antenna consists of a coplanar-waveguide (CPW) fed annular ring monopole with a gap near the CPW feed. The circular polarization is essentially realized with the circular current flow on the slotted annular ring and the unsymmetrical surface current on the ground plane. Furthermore, additional circularly polarized operation bands can be realized with the incorporation of stretched-out quarter-wavelength inverted-L sleeves on the ground plane edges. In this thesis, a single-band and a dual-band CPW-fed slotted annular ring monopole antennas are demonstrated. The single-band antenna features circular polarization at the L1 band, while the dual-band antenna is of circular polarization at the L1 band, as well as at 1.96 GHz. In addition, both antennas is of operating frequencies ranging from 1.5 GHz to 3 GHz for the GPS, DCS, PHS, WCDMA, and Bluetooth applications.