Time‐modulated multibeam steered antenna array synthesis with optimally designed switching sequence,International Journal of Communication Systems

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Time‐modulated multibeam steered antenna array synthesis with optimally designed switching sequence
International Journal of Communication Systems ( IF 1.7 ) Pub Date : 2021-04-12 , DOI: 10.1002/dac.4828
Avishek Chakraborty ₁ , Gopi Ram ₂ , Durbadal Mandal ₁

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Steering the radiation pattern of an antenna array towards the desired spatial angle is beneficial for modern‐age communication systems. The generation of multiple steered patterns by enhancing the first‐order harmonics of a time‐modulated antenna array (TMAA) with controlled radiation features is proposed in this paper. Suitable switching sequences are designed to realize an efficient electronic beam steering with these simultaneously generated narrow directional beam patterns. TMAAs are considered the time‐domain counterparts of phased arrays where high‐speed switches are used to achieve a weighted response by periodically modulating the array elements instead of attenuators or phase shifters. This periodic modulation inherently produces spurious harmonic patterns generally considered as power loss in unintended directions. The beam steering aimed in this paper is accomplished by exploiting the first‐order harmonic patterns in some specific directions keeping the fundamental pattern unaltered. The intended first positive and first negative harmonic components of the TMAA are utilized as steered multibeam patterns, whereas all the remaining harmonic components are suppressed to improve the efficiency of the array. To achieve this, suitable switching sequences are designed by optimizing the ON‐time duration and switching intervals of the elements with a wavelet mutation‐based particle swarm optimization (PSOWM). 16‐element linear TMAA is used to generate the desired patterns with low sidelobe levels (SLLs) for enhanced performance. Numerical results obtained for spatially independent steered patterns are presented and compared with the state‐of‐the‐art literature results.

中文翻译：

具有优化设计的切换序列的时间调制多波束转向天线阵列合成

将天线阵列的辐射方向图转向所需的空间角度对于现代通信系统而言是有益的。本文提出了通过增强具有受控辐射特性的时间调制天线阵列（TMAA）的一阶谐波来生成多个转向模式的方法。设计适当的切换顺序，以利用这些同时生成的窄方向性波束方向图实现高效的电子束转向。TMAA被视为相控阵的时域对应物，在该相控阵中，高速开关用于通过周期性地调制阵列元件而不是衰减器或移相器来实现加权响应。该周期性调制固有地产生寄生谐波模式，该寄生谐波模式通常被认为是非预期方向上的功率损耗。本文针对的光束转向是通过在某些特定方向上利用一阶谐波模式来保持基本模式不变的方式完成的。TMAA的预期的第一正和第一负谐波分量被用作转向多光束模式，而所有剩余的谐波分量均被抑制以提高阵列的效率。为此，通过基于小波突变的粒子群算法（PSOWM）优化元素的导通时间和切换间隔，设计了合适的切换序列。16元素线性TMAA用于生成具有低旁瓣电平（SLL）的所需码型，以增强性能。

更新日期：2021-05-04

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