Generation of OAM Radio Waves Using Circular Filter-Antenna Array

Li, Sirong; Liu, Baiyang; Liu, Yin; Wu, K.H.; Zhang, Li; Shen, Fei

doi:10.1109/icmmt49418.2020.9386645

Cited by 1 publication

(2 citation statements)

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“…Hence, the aperture efficiency of the proposed TA is better than the TAs in comparison. In addition, the PCB based TAs in [42,43] can realize gain full-metal 3D TA, due to the fact that the multi-order power divider and phase delay line result in a larger loss. The loss will be multiple accrual, especially for the high-gain array with a large aperture size.…”

Section: Fabrication and Measurement Of The Ta Prototypementioning

confidence: 99%

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Gain and mode purity filtering dual polarized OAM beam generation using cavity waveguide-based 3D transmitarray

Cao,

Zhang,

Yang

et al. 2024

J. Phys. D: Appl. Phys.

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A 3D transmitarray (TA) is proposed to generate dual-polarized orbital angular momentum (OAM) beams with gain and mode purity filtering responses. The TA units are realized by square cavity filters with the same passband and different orders and inner widths, resulting in different coupling cavity numbers. The evanescent modes in the coupling cavities will greatly decrease the propagation constant, thus generating a large phase variation. The square structure of the cavity filter makes it able to support dual-polarized wave propagation with the same phase delay and insert loss. Based on these transmission characteristics, eight different TA units are designed to realize a 3-bit phase gradient within the passband of 25.4 GHz to 26.7 GHz. It should be emphasized that the dispersed transmission phase and magnitude of the eight TA units in the stopbands will deteriorate the purity of the OAM beam. Therefore, the gain and mode purity filtering responses can be realized simultaneously. In order to verify the performance of the proposed OAM TA design, a TA prototype with the mode number l = -1 is fabricated by 3D printing technology. The TA can realize the maximum gain of 25.9 dB in the passband, and the rejection level is below –15.0 dB within the main beam direction. The purities of dual-polarized OAM beams are over 0.5 in the passband, and the cross-polarization is below –16.5 dB. The advantages of the OAM TA, including gain-filtering and mode purity-filtering responses, dual-polarization, and high efficiency make it a promising solution for millimeter-wave OAM sensing and communication applications.

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Section: Fabrication and Measurement Of The Ta Prototypementioning

confidence: 99%

“…To achieve OAM beams with gain-filtering response, several conventional OAM antenna designs are combined with various filters. In [42,43], two types of gain-filtering antenna are used as the units of a circular array. The antenna arrays can achieve OAM beams with around −15.0 dB rejection level.…”

Section: Introductionmentioning

confidence: 99%