Demonstration of Highly Steerable Beamforming System Incorporating a Waveguide of Spatially Distributed Fiber Bragg Grating

• Published in: 2019 6th International Conference on Signal Processing and Integrated Networks (SPIN) pp. 367 - 370
• Main Authors: Kumar Srivastava, Nimish, Kumar Raghuwanshi, Sanjeev
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.03.2019
• Subjects: and Phased array antenna (PAA); Antenna radiation patterns; Bragg gratings; Delay effects; Fiber Bragg grating (FBG); Mach-Zehnder Modulator (MZM); Microwave antenna arrays; Phased arrays; Photonics; True time delay (TTD)
• DOI: 10.1109/SPIN.2019.8711766

This paper, demonstrate a photonic technique based wideband time delay beamforming network employing a spatially distributed array of Bragg grating for controlling the radiation angle of phased array antenna (the directional angle of maximum power containing lobe of PAA's radiation pattern adjusted squint-free between 0° to ±51.68°) widely useful in the area of microwave beamforming near Ku-band. Our setup, pivot on highly dispersive fiber Bragg grating prism (each grating is 4mm in length) and Mach-Zehnder interferometers. The proposed work is experimentally and theoretically appraised as well as squint-free beam steering of microwave waveform is probed by simulation. When the phase shift between the channels is zero, i.e. when the two signals are in phase a constructive addition of the signals occurs and a maximum power level is received. When all the channels are out of phase, a destructive addition of the combined waveforms leads to a minimum received power level. Ultimately, if we make such an offset adjustment so that the phases and the amplitudes of sixteen RF signals are same, a single beam toward the straight forward direction will be formed.