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首页> 外文会议>IEEE Antennas and Propagation Society International Symposium >Analog Dispersive Time Delayer for Beam-Scanning Phased Array Without Beam-Squinting
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Analog Dispersive Time Delayer for Beam-Scanning Phased Array Without Beam-Squinting

机译：用于光束扫描相控阵的模拟分散时间延迟器，无横梁眯眼

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摘要

Beam-scanning phased array antennas are a cornerstone of many point-to-point or point-to-multipoint microwave transmitters/receivers. In most phased arrays, phase shifters are employed to achieve beam-scanning. However, phase-shifters induce beam-squinting, which deteriorates the phased array's performance in terms of its directivity and gain, leading to an increase in SNR [1]. In communication systems, this increases the bit-error-rate, while it decreases the accuracy in target detection/tracking radars and the resolution in synthetic aperture radars. Instead of phase shifters, true-time delayers (TTDs) [2] may be used for beam-scanning while also suppressing beam-squinting [1]. TTDs are conventionally implemented as digital switched-lines, non-linear transmission lines, optical fibers, or ferromagnetic devices. Digital switched-lines suffer from excessive size and cost, in addition to utilizing power-consuming latency-prone active switches. More importantly, their discrete phase shift generally leads to quantization errors. Non-linear transmission lines utilize power-consuming varactors and exhibit a limited total phase shift due to mismatch losses. Optical fibers generate high delay at multi-bands, however they are heavy, bulky, non-planar, and expensive for microwave applications. Finally, ferromagnetic-based TTDs require an external magnet, leading to bulky and non-planar devices. In this work, we propose a new and alternative method to implement a time delayer (TD) using a dispersive delay line, namely the composite right/left-handed (CRLH) [3] transmission line which, when implemented in a scanning phased array, suppresses beam squinting similarly to a TTD.
机译：光束扫描相控阵列天线是许多点对点或点对多点微波发射器/接收器的基石。在大多数相位阵列中，采用相移器来实现光束扫描。然而，相移器诱导光束斜视，这在其方向性和增益方面使相位阵列的性能降低，导致SNR的增加[1]。在通信系统中，这增加了比特差率，而它降低了目标检测/跟踪雷达的精度和合成孔径雷达中的分辨率。代替相移器，真正的延迟器（TTDS）[2]可以用于光束扫描，同时抑制波束斜视[1]。 TTD通常以数字开关线，非线性传输线，光纤或铁磁性设备实现。除了利用消耗功耗延迟 - 易于活动开关之外，数字交换线还患大小和成本。更重要的是，它们的离散相移通常导致量化误差。非线性传输线利用消耗功率变容仪，并且由于不匹配损失而表现出有限的总相移。光纤在多频带产生高延迟，但对于微波应用，它们是重型，笨重的，非平面的且昂贵的。最后，基于铁磁基的TTD需要外部磁铁，导致庞大和非平面装置。在这项工作中，我们提出了一种新的和替代方法来实现使用分散延迟线的时间延迟器（TD），即复合右/左手（CRLH）[3]传输线，当在扫描相控阵列中实现时，抑制与TTD类似的光束眯眼。

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