Abstract

Conventional narrowband beamforming methods are not effective for wideband antenna arrays. Radiation pattern of such array has various beam width over the frequency. Existing frequency-invariant beamforming methods using finite impulse response filters (FIR-filters) can solve this problem. FIR-filters provide frequency response required for frequency-independent properties of the array radiation pattern but their common feature is a high computational complexity. In this paper, we present the fixed frequency-invariant beamforming method that does not require minimizing functions or the Fourier transform. The beam steering is achieved by using FIR-filters with different slope of the frequency response. The proposed approach is based on the FIR-filters synthesis with special frequency characteristics. The numerical results compared with the existing frequency-invariant beamforming method are shown.

中文翻译：

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基于FIR滤波器的频率不变波束转向

摘要

常规的窄带波束成形方法对于宽带天线阵列无效。这种阵列的辐射图在整个频率上具有不同的束宽。使用有限脉冲响应滤波器（FIR滤波器）的现有频率不变波束形成方法可以解决此问题。FIR滤波器提供了阵列辐射图的频率独立特性所需的频率响应，但它们的共同特点是计算复杂度高。在本文中，我们提出了一种固定频率不变的波束成形方法，该方法不需要最小化函数或傅立叶变换。通过使用具有不同频率响应斜率的FIR滤波器来实现光束转向。所提出的方法基于具有特殊频率特性的FIR滤波器合成。