| 单点背馈圆极化微带天线的设计与实现 |
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| 引用本文： | 韩庆文,邓松,王韬.单点背馈圆极化微带天线的设计与实现[J].重庆大学学报(自然科学版),2008,31(1):48-51. |
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| 作者姓名： | 韩庆文 邓松 王韬 |
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| 作者单位： | 重庆大学,通信工程学院,重庆,400030;重庆大学,通信工程学院,重庆,400030;重庆大学,通信工程学院,重庆,400030 |
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| 摘 要： | 采用有限元法对一个5.6 GHz 的单点馈电的五边形宽带圆极化微带天线进行理论分析及设计实现,给出了完整的设计过程,找到了一种确定馈电点位置的合理方法.在此基础上,采用HFSS三维电磁仿真软件进行优化设计,根据优化结果做出实物并测量参数.测试结果与仿真结果吻合,说明该方法是有效可行的.
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| 关 键 词： | 微带天线 圆极化 轴比 五边形 方向图 电压驻波比 |
| 文章编号： | 1000-582X（2008）01-0048-04 |
| 收稿时间： | 2007-09-20 |
| 修稿时间： | 2007年9月20日 |
Entropy of images after wavelet transform |
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| TIAN Feng-chun,JI Yan-li,HAN Liang and KADRI Chaibou.Entropy of images after wavelet transform[J].Journal of Chongqing University(Natural Science Edition),2008,31(1):48-51. |
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| Authors: | TIAN Feng-chun JI Yan-li HAN Liang and KADRI Chaibou |
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| Institution: | College of Communication Engineering, Chongqing University, Chongqing 400030, P.R. China;College of Communication Engineering, Chongqing University, Chongqing 400030, P.R. China;College of Communication Engineering, Chongqing University, Chongqing 400030, P.R. China;College of Communication Engineering, Chongqing University, Chongqing 400030, P.R. China |
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| Abstract: | We studied the variation of image entropy before and after wavelet decomposition, the optimal number of wavelet decomposition layers, and the effect of wavelet bases and image frequency components on entropy. Numerous experiments were done on typical images to calculate (using Matlab) the entropy before and after wavelet transform. It was verified that, to obtain minimal entropy, a three-layer decomposition should be adopted rather than higher orders. The result achieved by using biorthogonal wavelet decomposition is better than that of the orthogonal wavelet decomposition. The results are not directly proportional to the vanishing moment, however. |
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| Keywords: | micro-strip antenna circular polarization axial ratio pentagon antenna pattern VSWR |
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