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- Title
Near-field uniformity analysis and compensation for finite-sized beam combiner with the asymmetric layout.
- Authors
Hao, Kaizi; Li, Zhuo; Wang, Xin; Zhou, Lang; Wang, Yiting
- Abstract
In a hardware-in-the-loop simulation system, the insertion of an asymmetric layout beam combiner will seriously affect the near-field uniformity. In this study, the effects of the aperture shape, transverse distance and size of the beam combiner on the near-field uniformity were analysed. The square beam combiner with a transverse distance of 0.51 m and a size of 1.05 m × 1.05 m was regarded as the optimal design, but it still cannot meet the test requirements. In order to obtain excellent near-field uniformity, an asymmetric Uniform + Linear taper compensation method was proposed. The maximum values of the amplitude fluctuation (Epv) and phase ripple (φpv) decreased dramatically from 2.62 dB and 16.79° to 0.78 dB and 7.42°, respectively. Asymmetric Uniform + Linear taper was achieved through serrating the edge of the beam combiner. When the number of serrations N was 22, Epv and φpv were <0.83 dB and 7.50°, respectively, which indicated that the near-field uniformity can be significantly improved by asymmetric Uniform + Linear taper.
- Subjects
HARDWARE-in-the-loop simulation; UNIFORMITY; SIMULATION methods &; models; LASER beams; NEAR-fields
- Publication
IET Microwaves, Antennas & Propagation (Wiley-Blackwell), 2020, Vol 14, Issue 13, p1671
- ISSN
1751-8725
- Publication type
Article
- DOI
10.1049/iet-map.2019.1082