共查询到18条相似文献,搜索用时 140 毫秒
1.
2.
针对微带天线的带内和带外雷达散射截面(radar cross section,RCS)减缩问题,提出了一种加载组合梯度超表面的低RCS天线设计方法,以解决传统RCS减缩技术存在的带宽受限和设计复杂问题.该方法将8个梯度方向间隔45°的梯度超单元依次排列在辐射贴片的周围,由于梯度超单元的奇异反射特性,散射场将会被重新分布至各个方向,表现出漫反射效果,从而实现单站和双站的RCS减缩.仿真和测试结果表明:加载组合梯度超表面前后微带天线的RCS在7.2~18.4 GHz减缩了5 dB以上,且微带天线原有的辐射特性基本保持不变.该设计方法具有设计简单、超宽带工作的特点. 相似文献
3.
4.
《固体电子学研究与进展》2015,(5)
针对微带天线的带内雷达散射截面减缩问题,提出了一种在天线表面加载共面紧凑型电磁带隙结构(UC-EBG),通过散射对消,实现天线雷达散射截面(RCS)减缩的方法。分析了在不同参数下UC-EBG结构同相反射相位带隙随频率的变化情况。仿真和实测结果表明:加载UC-EBG结构后,天线带内RCS得到了很大减缩,最大减缩达到了14dB,同时微带天线回波损耗基本保持不变,天线的增益不仅未受影响而且有所增加。证实了UCEBG可以很好地应用于微带天线的带内隐身。 相似文献
5.
基于互补开口谐振环奇异的折射率特性,研制了一种可用于雷达低可见平台的新型微带天线.采用等效分析方法对CSRR结构的等效媒质参数加以研究,并将其应用于普通微带天线非辐射边一侧的接地板上,在保证天线辐射特性基本不变的同时使散射波远离镜像方向,从而实现在空域中的带外雷达散射截面积减缩.仿真和测试结果表明,加载CSRR结构的微带天线仍为线极化,前向增益仅损失0.32dB,对于不同角度入射波镜像方向RCS均有减缩,其中法线方向RCS最大减缩量达到7.8dB.该设计具有低成本、设计简单、便于加工、利于共形等优点,为天线RCS减缩提供了新思路. 相似文献
6.
7.
8.
9.
10.
11.
Dual-frequency slotted rectangular microstrip antenna 总被引:2,自引:0,他引:2
Kin-Lu Wong Jia-Yi Sze 《Electronics letters》1998,34(14):1368-1370
By embedding a pair of properly-bent narrow slots close to the non-radiating edges of a rectangular microstrip patch, a novel dual-frequency operation of microstrip antennas using a single probe feed is proposed and experimentally studied. The two operating frequencies have parallel polarisation planes and similar broadside radiation patterns, and the frequency ratio of the two frequencies is controlled by the bent angle of the embedded slots. Details of the obtained dual-frequency performance are presented and discussed 相似文献
12.
13.
分析了微带天线RCS(雷达散射截面)缩减的物理机制,对典型的RCS缩减技术进行了综述,评论了几种计算微带天线RCS的理论方法,指出了微带天线RCS研究中值得探索的若干问题。 相似文献
14.
Shyh-Tirng Fang Kin-Lu Wong Tzung-Wern Chiou 《Electronics letters》1998,34(23):2184-2186
By embedding a pair of properly-bent narrow slots in an equilateral-triangular microstrip patch, broadband operation of microstrip antennas with an inset microstrip-line feed can be achieved. With the proposed antenna design, the impedance bandwidth can be as large as ~3.0 times that of a corresponding simple triangular microstrip antenna. Some simple design rules for the proposed antenna have also been determined experimentally. The design rules and experimental results are presented and discussed 相似文献
15.
Hung Y. David Yang 《Antennas and Propagation, IEEE Transactions on》1996,44(8):1127-1132
Switchable antennas consisting of microstrip elements with an in-plane biased ferrite cover layer are introduced. Their radiation and radar cross section (RCS) properties are examined through a full-wave moment-method analysis. For microstrip antennas with a ferrite cover layer, the presence of a decaying extraordinary wave in the ferrite layer can reduce or prohibit incident fields from reaching the antenna resulting in significant RCS reduction. For antenna radiation, most of the power will be converted into magnetostatic waves and little radiates into the air. Under such circumstances, the antennas are “off,” in the sense that they are effectively absent as radiators or scatterers. The aim of this paper is, through the use of an accurate full-wave analysis, to investigate the properties of the switchable microstrip antennas. Both the cases of strip dipoles and rectangular patches are analyzed. The effects of the cover-layer thickness, bias-field strength, and the existence of both ordinary and extraordinary waves on the switchable antenna properties are discussed 相似文献
16.
17.
18.
Ghorbani A. Ansarizadeh M. Abd-alhameed R. A. 《Antennas and Propagation, IEEE Transactions on》2010,58(2):250-257