Electronically controlled phased-array antennas can adaptively scan radiated beams in three-dimensional space without
mechanically moving parts. While most of the research on phased-array antennas has been focusing on broadband beam
steering less attention has been devoted to null steering. Broadband null steering requires a beamformer that can generate
variable and frequency independent true time-delays (TTD). In this paper we propose and demonstrate the concept of an
Opto-VLSI-based tunable true-time delay generation unit for adaptive null steering in phased array antennas, where
arbitrary single or multiple true-time delays can simultaneously be synthesized. Simulated azimuth gain patterns for a 4-
element antenna arrays is presented, and experimental results are shown, which demonstrate the principle of the
proposed true-time delay unit.
This paper presents an integrated MicroPhotonic beamformer that processes RF-modulated optical signals to adaptively
synthesise multiple broadband nulls in smart phased-array antennas. The beamformer is designed to operate at centre
frequency of 5.6 GHz with 1 GHz bandwidth. Designs of the different photonic and RF components are presented.
Simulation results show that a 4-element MicroPhotonic broadband smart antenna beamformer operating in the 5.1-6.1-
GHz range can generate three broadband nulls, with less than 1.121° beam squint.
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