Grating lobes suppression in transverse slot linear array with a Dual Parasitic Beam of strip dipoles
Grating lobes suppression in transverse slot linear array with a Dual Parasitic Beam of strip dipoles
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DOI：
10.1093/ietcom/e88-b.6.2320
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发表时间：
2005-06-01
影响因子：
0.7
通讯作者：
Ando, M
中科院分区：
文献类型：
--
作者：
Hossain, MGS;Hirokawa, J;Ando, M
提出了一种双寄生波束抑制矩形波导宽壁横向狭缝阵列中光栅瓣的新技术。该技术涉及到产生DPB的寄生带状偶极子的额外层；在不与原槽阵主梁相对的情况下抑制光栅瓣。利用矩量法（MoM）进行了全波电磁分析，计算了耦合激励系数以及槽电流和偶极电流的远场模式。分析表明，为了达到理想的偶极激发水平，需要适当的偶极子尺寸和排列，以满足光栅抑制条件。研究发现，在寄生偶极子存在的情况下，光栅瓣可被抑制15 dB。通过实验验证了计算结果。
A new technique called the Dual Parasitic Beam (DPB) technique is proposed to suppress grating lobes in a rectangular waveguide broad wall transverse slot array. This technique involves an extra layer of parasitic strip dipoles that generate the DPB; to suppress the grating lobes without opposing the main beam of the original slot linear array. A full wave EM analysis in Method of Moments (MoM) is conducted to compute the coupling excitation coefficients as well as the far field patterns of the slot and dipole currents. Analysis shows that a suitable dimension and arrangement of dipoles are needed to get a desired level of dipole excitations to meet the grating suppression condition. It is found that the grating lobes can be suppressed as much as 15 dB in the presence of the parasitic dipoles. Experiments are conducted to confirm the computed results.