標題: | Novel Broadband Monopole Antennas With Dual-Band Circular Polarization |
作者: | Jou, Christina F. Wu, Jin-Wei Wang, Chien-Jen 電信工程研究所 Institute of Communications Engineering |
關鍵字: | Axial ratio (AR);broadband antennas;circular polarization (CP);monopole antennas |
公開日期: | 1-四月-2009 |
摘要: | Novel broadband monopole antenna designs with dual-band circular polarization (CP) are presented. The proposed antenna comprised of a ground plane embedded with an inverted-L slit, which is capable of generating a resonant mode for broadband impedance-bandwidth, and excites two orthogonal E vectors with equal amplitude and 90 degrees phase difference (PD) for radiating left-hand circular polarization (LHCP) at 2.5 GHz and right-hand circular polarization (RHCP) at 3.4 GHz. A bevel is cut in the rectangular radiator to increase the impedance-bandwidth. The measured result of the impedance-bandwidth is about 4.46 GHz from 2.12 to 6.58 GHz; the 3-dB axial ratio (AR) bandwidths are about 150 MHz at the lower band (2.5 GHz) and 230 MHz at the upper band (3.4 GHz). Furthermore, embedding an I-shaped slit in the rectangular radiator and adding an I-shaped stub in the ground plane, the impedance-bandwidth can be further increased to 6.30 GHz (2.17-8.47 GHz), and the 3-dB AR-bandwidth at the upper band is greatly enhanced from 230 to 900 MHz. |
URI: | http://dx.doi.org/10.1109/TAP.2009.2015827 http://hdl.handle.net/11536/7395 |
ISSN: | 0018-926X |
DOI: | 10.1109/TAP.2009.2015827 |
期刊: | IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION |
Volume: | 57 |
Issue: | 4 |
起始頁: | 1027 |
結束頁: | 1034 |
顯示於類別: | 期刊論文 |