Radar broadband beamforming technique based on sub-wavelength stepped optical delay line

Ang Liu; Ji-quan Zhai

doi:10.1117/12.2618014

15 February 2022 Radar broadband beamforming technique based on sub-wavelength stepped optical delay line

Ang Liu, Ji-quan Zhai

Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 121667T (2022) https://doi.org/10.1117/12.2618014
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong

Abstract

For the beamforming system of wideband radar, the use of phase shifters will bring obvious directional dispersion. In addition, the bandwidth and in-band performances of electrical delay lines and phase shifters are facing technical bottlenecks. In this paper, the theoretical analysis of beam scanning based on sub-wavelength stepped optical delay lines shows that the beam directional deviation is proportional to the minimum delay interval. The feasibility of the technique is verified by simulations and experiments. Under the circumstance of 8-12GHz microwave frequency range and ±60° azimuthal scanning range, the experimental results demonstrate that the squint of the broadband beam and the in-band directional dispersion can be reduced to less than 0.77° and 0.98°, respectively.

Citation Download Citation

Ang Liu and Ji-quan Zhai "Radar broadband beamforming technique based on sub-wavelength stepped optical delay line", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 121667T (15 February 2022); https://doi.org/10.1117/12.2618014

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