Circularly polarized wave beamforming using one‐dimensional Fresnel zone plate. Issue 5 (28th January 2019)

• Record Type: Journal Article
• Authors: Youn, Youngno; Hong, Wonbin
• Is Part Of: Microwave and optical technology letters. Volume 61:Issue 5(2019:May)
• Page Start: 1263
• Page End: 1267
• Publication Date: 2019-01-28
• Subjects: circular polarization -- frequency selective surface -- Fresnel zone plate -- near‐field; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.31731
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: This letter entails a methodology to steer circularly polarized (CP) wave main beam in the near‐field region. The letter first demonstrates a planar circular polarizer which can convert an incoming linearly polarized wave into a CP wave from 24.0 to 40.0 GHz. Afterwards a one‐dimensional Fresnel zone plate consisting of electrically opaque and transparent regions is devised to formulate constructive interference for CP near‐field beamsteering at 22°. Measurement ascertains that the axial ratio and TE/TM phase difference at the aforementioned angle is 0.36 dB and 87.1°.