Efficient leaky-wave antennas at terahertz frequencies generating highly directional beams
Efficient leaky-wave antennas at terahertz frequencies generating highly directional beams
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DOI：
10.1063/5.0033126
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发表时间：
2020-12-28
影响因子：
4
通讯作者：
Mittleman, D. M.
中科院分区：
文献类型：
--
作者：
Guerboukha, H.;Shrestha, R.;Mittleman, D. M.
由于其频率相关的角发射，漏波天线最近被引入太赫兹频段，以解决与太赫兹无线通信相关的许多挑战。大多数先前的工作都利用了为微波区域开发的传统漏波波导架构。在本文中，我们详细研究了太赫兹频率下漏波天线的发射特性。我们表明，在这些高频下，波长尺度与孔径的相互作用会导致槽界面处的电场分布不均匀，这是在较低频率下通常不会遇到的独特情况。当缝隙宽度增加到缝隙侧面充当二次泄漏结构的程度时，这种效应甚至更加明显，并且由于给定频率下的能量在较宽的角度范围内辐射，因此不遵守众所周知的频率-角度关系。因此，为了利用将频率与发射角耦合的相位匹配条件，必须使用非常薄的矩形槽d
Due to their frequency-dependent angular emission, leaky-wave antennas have been recently introduced in the terahertz band to tackle many of the challenges associated with THz wireless communications. Most previous works have exploited conventional leaky-wave waveguide architectures developed for the microwave region. In this paper, we study in detail the emission characteristics of leaky-wave antennas at THz frequencies. We show that, at these high frequencies, the wavelength-scale interaction with the aperture causes a nonuniform electric field distribution at the slot interface, which is a unique regime that is not typically encountered at lower frequencies. This effect is even more pronounced as the slot width increases to a point where the sides of the slot act as secondary leaking structures, and the well-known frequency-angle relationship is not obeyed as the energy at a given frequency is radiated in a broad range of angles. Therefore, to exploit the phase matching condition, which couples frequency to emission angle, one must use very thin rectangular slotsd