A glide-symmetry Goubau line leaky-wave antenna for achieving both high scanning rate and wide scanning angle range is introduced. The novelty of the design is its combination of glide symmetry and a single-layer Goubau line. This combination leads to performance enhancement in both scanning rate and scanning angle range. Utilizing a corrugated Goubau line in a glide-symmetry fashion closes its stopband at the cutoff frequency while slowing down its group velocity. As the dispersion around the closed stopband is shifted to the fast-wave region by periodic profile modulation, the space harmonics exhibit high-scanning-rate radiation. In conjunction with this, the single-layer nature of the Goubau line allows the beam to scan from nearly endfire to backfire directions, leading to a wide scanning angle range. Numerical examples and experimental validation are provided to validate the proposed design. These show that the proposed antenna exhibits dual-band operation, where one band scans 152° within 2.2 GHz (corresponding to scanning rate of 69°/GHz) with 67% efficiency, while the second band scans 145° within 0.7 GHz (corresponding to scanning rate of 207°/GHz) with 26% efficiency. A tradeoff between scanning rate and efficiency always exists in high-scanning-rate leaky-wave antennas. One is able to freely choose the preferred scanning rate in this single antenna. A comparison with other related works shows that the proposed antenna exhibits the best performance.

中文翻译：

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基于滑动对称Goubau线的高扫描率广角漏波天线

介绍了一种兼具高扫描速率和宽扫描角度范围的滑行对称Goubau线漏波天线。该设计的新颖之处在于它结合了滑动对称性和单层 Goubau 线。这种组合导致扫描速率和扫描角度范围的性能增强。以滑动对称方式使用波纹 Goubau 线可在截止频率处关闭其阻带，同时减慢其群速度。由于闭合阻带周围的色散通过周期性轮廓调制转移到快波区域，空间谐波表现出高扫描率辐射。与此相结合，Goubau 线的单层性质允许光束从近端射向回射方向进行扫描，从而产生较宽的扫描角度范围。提供了数值例子和实验验证来验证所提出的设计。这些表明所提出的天线表现出双频段操作，其中一个频段在 2.2 GHz 内扫描 152°（对应于 69°/GHz 的扫描速率），效率为 67%，而第二个频段在 0.7 GHz 内扫描 145°（对应于207°/GHz 的扫描速率），效率为 26%。在高扫描率漏波天线中总是存在扫描率和效率之间的权衡。在这根单天线中可以自由选择首选的扫描速率。与其他相关工作的比较表明，所提出的天线表现出最佳性能。2 GHz（对应69°/GHz的扫描速率）效率为67%，而第二频段在0.7 GHz范围内扫描145°（对应207°/GHz的扫描速率）效率为26%。在高扫描率漏波天线中总是存在扫描率和效率之间的权衡。在这根单天线中可以自由选择首选的扫描速率。与其他相关工作的比较表明，所提出的天线表现出最佳性能。2 GHz（对应69°/GHz的扫描速率）效率为67%，而第二频段在0.7 GHz范围内扫描145°（对应207°/GHz的扫描速率）效率为26%。在高扫描率漏波天线中总是存在扫描率和效率之间的权衡。在这根单天线中可以自由选择首选的扫描速率。与其他相关工作的比较表明，所提出的天线表现出最佳性能。