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Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos⁡(2θ), features four symmetric lobes, each...

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Published on: April 1, 2020

Two-dimensional optical architecture for time-delay beam forming in a phased-array antenna.

D Dolfi, F Michel-Gabriel, S Bann

|September 24, 2009

Summary

We introduce a novel optical architecture using spatial light modulators to control phased-array antennas, enabling precise time delays and phase control for microwave signals.

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Area of Science:

Optoelectronics
Microwave Engineering
Antenna Technology

Background:

Phased-array antennas require precise control of time delays and signal phases for beam steering.
Optical methods offer potential for high-speed, high-resolution control of microwave signals.

Purpose of the Study:

To propose and demonstrate a novel two-dimensional optical architecture for controlling phased-array antennas.
To achieve 2(N) time delays and 0 to 2pi phase control for microwave signals using optical components.

Main Methods:

Utilizing N spatial light modulators for polarization switching to generate time delays.
Employing a liquid-crystal spatial light modulator in birefringent mode for optical phase control.
Generating microwave signals via coherent detection of a dual-frequency laser beam from an acousto-optic frequency shifter.

Main Results:

Demonstration of a new two-dimensional optical architecture for phased-array antenna control.
Successful implementation of polarization switching for generating multiple time delays.
Optical control of microwave signal phase (0 to 2pi) demonstrated.

Conclusions:

The proposed optical architecture offers a flexible and efficient method for controlling phased-array antennas.
Experimental validation at 1.85 GHz confirms the feasibility of the optical control approach.