Coplanar Waveguide Fed Broadband Circularly Polarized Square Slot Antenna

• Main Authors: Te-Hsing Chen, 陳德興
• Other Authors: We-Hua Tu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/51687270264892438571

碩士 === 國立中央大學 === 電機工程學系在職專班 === 101 === This thesis describes the design with simplification structure and fabrication on the same plane of FR-4 substrate. At first studying the single band CPW-fed slot antenna, and then designing of proposed broadband circular polarization CPW-fed slot antenna, which is achieved by an asymmetry ground plane makes the adjacent resonant mode to merge into a wide operation bandwidth and etching C-shaped ground strip on the edge of left side of ground plane to offer the current path, two orthogonal electric fields with a 90°phase difference for exciting a circular polarization radiation wave. On the other hand, a C-shaped slot is embedded at the bottom right corner of ground plane. It is used for broadband AR and impedance matching. The measured impedance bandwidth (VSWR 2) is 0.92 GHz (46% relative to the center frequency at 2 GHz). The 3-dB axial ratio bandwidth (ARBW) is 0.65 GHz (32.5% relative to the center frequency at 2 GHz), and antenna peak gain is 3.31 dBi with variations of less than 1 dBi. This antenna is suitable for wireless communication system (1.71－2.17 GHz) and navigation system (1.57－1.61 GHz).