Millimeter-Wave Dual-Mode Low Divergence Angle OAM Antennas With High Mode Purity in Wide Bandwidth

IF 4.6 1区 计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Zhiqiang Liu;Xue Ren;Shaowei Liao;Wenquan Che;Quan Xue
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引用次数: 0

Abstract

This communication introduces a new design of millimeter-wave (mmWave) dual-mode, low divergence angle orbital angular momentum (OAM) antennas with high mode purity over a wide bandwidth. Conventional feeding networks for OAM antennas rely on varying transmission line lengths realizing phase shift, which struggles to maintain high mode purity over a wide bandwidth. Therefore, an innovative feeding network scheme is proposed, utilizing a wideband 90° cascaded hybrid coupler and reversible feeding direction of the microstrip-to-slot transition, achieving wideband 90° and 180° phase shifts, respectively, then ensuring wideband high mode purity. Then, ±1 and ±2 mode OAM antennas are designed, where the proposed feeding network excites a lens-loaded uniform circular array (UCA). To ensure high E-field rotational symmetry and thus high OAM mode purity, the aperture of the ±1 mode UCA is shaped by loading an overmoded circular waveguide with notches. Measurement shows that the proposed OAM antennas support two simultaneous modes, with mode purity exceeding 90% and divergence angles of about ±4°/±6° from 25 to 28 GHz (11.3%). Compared to other OAM antennas, these designs excel in terms of high mode purity over a wide bandwidth in the mmWave band, making them ideal for mmWave OAM measurements and wireless communication systems.
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来源期刊
CiteScore
10.40
自引率
28.10%
发文量
968
审稿时长
4.7 months
期刊介绍: IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas, including design and development, and in the propagation of electromagnetic waves, including scattering, diffraction, and interaction with continuous media; and applications pertaining to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques
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