Acta Photonica Sinica, Volume. 51, Issue 3, 0306001(2022)
Radar Broadband Beamforming Technique Based on Sub-wavelength Stepped Optical Delay Line
Figures & Tables(11)
Fig. 3. Simulation results of beam squint at different microwave frequencies
Fig. 4. Simulation results of beam peak power at different microwave frequencies
Fig. 5. Simulation results of beam sidelobe power at different microwave frequencies
Fig. 7. Amplitude and phase characteristics of the four-channel photonic subarray module
Fig. 8. Experimental results of antenna patterns at different azimuths and frequencies
Table 1. Parameters of the X-band one-dimensional phased-array antenna
View tableView in ArticleTable 1. Parameters of the X-band one-dimensional phased-array antenna
Unit number Unit spacing/mm Center frequency/GHz Bandwidth/GHz Azimuth coverage/（°） 32 9 10 4 ±60
Table 2. Comparison of beamforming performance of different schemes
View tableView in ArticleTable 2. Comparison of beamforming performance of different schemes
Delay step of 3 ps without phase shifter Delay step of 5 ps without phase shifter Delay step of 83.3 ps with phase shifter Beam pointing/（°） Maximum squint 0.13 0.56 2.51 In-band fluctuation 0 0 2.51 Peak power/dB Maximum loss 0.051 0.055 1.742 In-band fluctuation 0.028 0.031 1.742 Sidelobe power/dB Maximum power -12.5 -11.6 -3.9 In-band fluctuation 0.24 0.53 9.3
Table 3. Broadband beamforming experiment results
View tableView in ArticleTable 3. Broadband beamforming experiment results
Target beam pointing/（°） 0 30 60 Beam pointing/（°） Maximum squint 0.24 0.28 0.77 In⁃band fluctuation 0.21 0.28 0.98 Peak power/dB Maximum loss 0.13 0.18 0.89 In⁃band fluctuation 0.13 0.18 0.89 Sidelobe power/dB Maximum power -11.5 -11.06 -11.82 In⁃band fluctuation 1.46 1.84 1.68
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Ang LIU, Guanghao SHAO, Jiquan ZHAI, Xingwei YE, Guoqiang ZHANG. Radar Broadband Beamforming Technique Based on Sub-wavelength Stepped Optical Delay Line[J]. Acta Photonica Sinica, 2022, 51(3): 0306001
Paper Information
Category: Fiber Optics and Optical Communications
Received: Jun. 28, 2021
Accepted: Sep. 23, 2021
Published Online: Apr. 8, 2022
The Author Email: Ang LIU (la0819@163.com)
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