A partial slotted curved waveguide leaky-wave antenna which can directly generate orbital angular momentum (OAM) mode-groups (MG) with high equivalent OAM order $l_{e}=\pm 40$ at 60 GHz is proposed in this letter. This partial arc slotted antenna is designed based on the circular traveling-wave antenna which can generate a single mode conventional OAM wave, so it can be termed as a partial arc transmitting (PAT) scheme compared with the full $2\pi $ aperture slotting of the circular traveling-wave antenna. The full-wave simulation results show that the generated OAM MGs present a high gain beam with a helical phase distribution. Thus it can be used in a MG based line-of-sight (LoS) multiple-in-multiple-out system (MG-MIMO), whose performance is numerically analyzed. These MGs can improve the signal-to-noise ratio (SNR) and decrease the spatial correlation of sub-channels, thereby the MG-MIMO has a better performance in terms of capacity or BER than conventional MIMO.

中文翻译：

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OAM模式组的直接生成及其在LoS-MIMO系统中的应用

一种可直接产生高等效OAM阶的轨道角动量(OAM)模群(MG)的部分开槽弯曲波导漏波天线 $l_{e}=\pm 40$ 在这封信中建议使用 60 GHz。这种偏弧开槽天线是基于圆形行波天线设计的，可以产生单模常规OAM波，因此与全弧发射（PAT）方案相比，它可以称为偏弧发射（PAT）方案。 $2\pi $ 圆形行波天线的孔径开槽。全波仿真结果表明，生成的 OAM MG 呈现出具有螺旋相位分布的高增益光束。因此，它可用于基于 MG 的视距 (LoS) 多入多出系统 (MG-MIMO)，对其性能进行数值分析。这些MG可以提高信噪比（SNR）并降低子信道的空间相关性，因此MG-MIMO在容量或BER方面比传统MIMO具有更好的性能。