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Vortex wave generation using single‐fed circular patch antenna with arc segment
Author(s) -
Yang Guang,
Liu Yongcong,
Yan Yongpeng,
Li Weiwen
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32806
Subject(s) - physics , arc (geometry) , degenerate energy levels , vortex , antenna (radio) , optics , angular momentum , radiation pattern , patch antenna , electromagnetic radiation , acoustics , engineering , geometry , telecommunications , classical mechanics , mathematics , mechanics , quantum mechanics
Combined with characteristic mode analysis, the idea of degenerate mode synthesis can be used to guide the construction of a single antenna, which radiates vortex electromagnetic waves carrying orbital angular momentum (OAM). In this paper, an arc segment outside a circular patch is applied to disturb the structure symmetry to achieve a single‐fed antenna with orthogonal degenerate mode synthesis. Experimental results show that degenerated characteristic modes of circular patches radiate vortex waves one order lower than source modes. If two degenerate TM 21 source modes are superimposed, the first‐order OAM mode is generated. Since the arc segment as a disturbance element is independent of the radiation element, OAM modes of different orders can be realized by adjusting its length.