This paper presents the design, implementation, and the experimental verifications of a 2.4-GHz multibeam array receiver based on two-dimensional (2-D) spatially bandpass (SBP) digital plane wave (PW) filters. The digital array receiver consists of 2.4-GHz 16-element uniform linear array, and quadrature sampling is employed to process the broadband PWs at the baseband. Both 2-D finite impulse response (FIR) and infinite impulse response (IIR) digital filters having multiple trapezoidal-shaped passbands are employed as the 2-D SBP digital PW filters. Both 2-D FIR and IIR trapezoidal filters are implemented on a Xilinx Virtex 6 sx475t field programmable gate array chip that comes with the reconfigurable open architecture computing hardware version-2 (ROACH-2) platform. The 16 in-phase and quadrature-phase downconverted signals are sampled using the ROACH-2 platform and are processed using the digital architectures to form multiple beams. Example radio-frequency beam patterns corresponding to each filter architecture are measured and reported. The main lobes of the measured multibeam patterns are well aligned with the simulated multibeam patterns.

中文翻译：

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使用二维空间带通数字滤波器的 16 单元 2.4GHz 多波束阵列接收器

本文介绍了基于二维 (2-D) 空间带通 (SBP) 数字平面波 (PW) 滤波器的 2.4 GHz 多波束阵列接收器的设计、实现和实验验证。数字阵列接收机由 2.4 GHz 16 单元均匀线性阵列组成，采用正交采样处理基带上的宽带 PW。具有多个梯形通带的二维有限脉冲响应（FIR）和无限脉冲响应（IIR）数字滤波器都被用作二维 SBP 数字 PW 滤波器。二维 FIR 和 IIR 梯形滤波器均在 Xilinx Virtex 6 sx475t 现场可编程门阵列芯片上实现，该芯片带有可重构的开放式架构计算硬件版本 2 (ROACH-2) 平台。使用 ROACH-2 平台对 16 个同相和正交相位下变频信号进行采样，并使用数字架构进行处理以形成多个波束。测量并报告对应于每个滤波器架构的示例射频波束模式。测量的多波束模式的主瓣与模拟的多波束模式很好地对齐。