共查询到20条相似文献,搜索用时 124 毫秒
1.
2.
3.
针对共形球面天线阵列,采用有向天线阵元,在保持阵列孔径不变的条件下,以阵元分布位置作为优化变量,以降低最大相对旁瓣电平为优化目标,运用改进的遗传算法对阵列进行稀疏优化,仿真结果表明:该方法能够降低球形阵列的旁瓣电平,达到了减少阵元个数、降低天线系统成本的目的。 相似文献
4.
5.
6.
7.
8.
9.
全向波导裂缝阵列天线的数值分析 总被引:2,自引:0,他引:2
介绍了一种新的分析全向矩形波导裂缝阵列天线方向图的方法 .以电场积分方程为基础 ,选用Rao ,Wilton和Glisson的RWGfunction作为矩量法计算的基函数和检验函数 ,计算了裂缝波导内外壁上的电流分布 ,继而对全向波导裂缝阵的辐射方向图作了计算。数值计算结果也验证了T .Takeshima的实验结论即裂缝对矩形波导的E面全向辐射特性及波导高度对方向图不圆度的影响。同时也说明了文中所介绍的方法的有效性。 相似文献
10.
11.
The design of large waveguide arrays of shunt slots 总被引:3,自引:0,他引:3
It is shown that the method of moments (MM) solution can determine the active admittance of each slot in a finite array and that the infinite array model is quite accurate for the design of large waveguide arrays of shunt slots. Active admittances computed by an infinite array model agree favorably with that of slots in sufficiently large finite arrays. Measured results verify the MM solution, thereby validating the infinite array model accuracy 相似文献
12.
在星载Ku波段谐振式波导缝隙阵列天线设计中,由于结构空间的限制,采用半高非标准波导。考虑到半高波导中更容易产生高次模影响的特点,以及设计成本和效率问题,将基于有限元法的高频电磁仿真软件Ansoft HFSS与Fortran编程相结合应用于该类天线的设计。采用HFSS研究并描述了宽边纵向辐射缝隙和中心倾斜耦合缝隙的特性,结合Elliott提出的经典平面缝隙阵设计理论,用Fortran编程设计了阵元数为80(8×10)的波导缝隙阵列天线实验件,并用HFSS仿真优化了天线阵整体的性能。对实物天线进行了近场测试,结果表明:天线的E面和H面副瓣电平分别是-29 dB和-27.5 dB,1.3以下驻波带宽为340 MHz,与仿真结果基本吻合。良好的测试结果验证了用HFSS获取缝隙特性曲线的正确性及设计方法的有效性,为后期大型阵列设计提供了一种有效的方法。 相似文献
13.
14.
平板缝隙天线的计算机辅助设计 总被引:2,自引:0,他引:2
基于边值积分方程方法的小型平面缝隙阵的机助设计方法。这种计算方法是严格的。但即使对于小型阵,计算量也相当大。对小型阵提出缝列与耦合分支分别设计的方法,并给出模型实验结果。实验结果表明,对于一般指标的方阵,这种方法是可行的。对于低分瓣和超低旁瓣阵,尤其大型阵,还需以严格计算代替大量实验,去寻求简化计算的经验方法,建立一种半经验的机助设计方法。 相似文献
15.
16.
Gonzalez Picazo J.J. Calvo M. Besada J.L. Sahalos J.N. 《Antennas and Propagation, IEEE Transactions on》1990,38(11):1780-1783
A technique for the design of nonuniformly spaced waveguide slot arrays is proposed. The slots are in active resonance, and their position is adjusted so that the sources of the array will have the desired amplitudes and phases. The conductances of the slots depend on the desired pattern and the efficiency. Applications on Taylor and cosec 2&thetas; patterns have shown the validity of the method 相似文献
17.
波导窄边缝隙天线频带特性分析 总被引:1,自引:1,他引:0
给出了波导窄边缝隙天线频带特性的分析方法。对于行波天线,基于缝隙电导在频带内的变化改变了口径分布,进而影响天线波瓣性能。该文对不同缝隙分布的天线带内性能计算,探讨了主要设计参数的选择。制作了一个试验天线,测试结果与理论分析一致。 相似文献
18.
19.
Tzung-Fang Huang Shih-Wen Lu Powen Hsu 《Antennas and Propagation, IEEE Transactions on》1999,47(10):1560-1565
A method for analyzing and designing the slot antenna array excited by a coplanar waveguide (CPW) is presented. The slots are etched on the conducting plane of the CPW and placed in the direction perpendicular to the transmission line. Moment-method analysis and matrix-pencil approach are adopted to calculate the scattering parameters and hence the self-admittance of each slot. The mutual admittances between the slots are calculated from the formulas derived for the complementary strip dipoles based on the reciprocity theorem and via Booker's relation. Then the transmission line theory is used to calculate the input impedance of the array, and an iterative process is employed to obtain a matched design for a desired slot-voltage distribution. A four-element slot array is fabricated and measured using this design procedure. Calculated results are in good agreement with measurements 相似文献
20.
Transverse slots fed by a boxed stripline, with the strip passing centrally under the slot at an angle which controls the coupling, have been investigated theoretically and experimentally. A procedure has been developed which permits the design of arrays of such slots, including the effects of external mutual coupling. Agreement between theory and experiment has been found to be good for both a single slot and a linear array. 相似文献