A Flexible Phased-MIMO Array Antenna with Transmit Beamforming
A Flexible Phased-MIMO Array Antenna with Transmit Beamforming
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DOI：
10.1155/2012/609598
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发表时间：
2012-04
影响因子：
1.5
通讯作者：
Wen-qin Wang;H. Shao
中科院分区：
文献类型：
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作者：
Wen-qin Wang;H. Shao
虽然相控阵天线已经在现代雷达中得到了广泛的应用，但许多新兴应用的要求要求新的更先进的阵列天线。提出了一种发射波束形成的柔性相控阵多输入多输出(MIMO)阵列天线。该方法将发射天线阵列分成允许重叠的多个子阵列，每个子阵列以不同的发射频率相干地发射不同的波形，该不同的波形与由其他子阵列发射的波形正交。也就是说，在每个子阵列中采用较小的频率增量。每个子阵列形成定向波束，并且所有波束可以被引导到不同的方向。这些子阵共同提供了灵活的工作模式，如提供空间分集增益的MIMO阵列、提供相干方向增益的相控阵和提供距离相关波束方向图的频率分集阵列。通过分析发射-接收波束方向图来检验系统性能。大量的数值仿真结果验证了该方法的有效性。
Although phased-array antennas have been widely employed in modern radars, the requirements of many emerging applications call for new more advanced array antennas. This paper proposes a flexible phased-array multiple-input multiple-output (MIMO) array antenna with transmit beamforming. This approach divides the transmit antenna array into multiple subarrays that are allowed to overlap each subarray coherently transmits a distinct waveform, which is orthogonal to the waveforms transmitted by other subarrays, at a distinct transmit frequency. That is, a small frequency increment is employed in each subarray. Each subarray forms a directional beam and all beams may be steered to different directions. The subarrays jointly offer flexible operating modes such as MIMO array which offers spatial diversity gain, phased-array which offers coherent directional gain and frequency diverse array which provides range-dependent beampattern. The system performance is examined by analyzing the transmit-receive beampatterns. The proposed approach is validated by extensive numerical simulation results.