Vector-Interpolating Phase Shifter for Fine, Stable Beam Steering
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Solution Overview
Problem
Existing phased array antennas for satellite communications face challenges in achieving high resolution phase shifting with stability over temperature and process variations, while also requiring low power consumption and small form factor.
Innovation Solution
A high resolution phase shifter is designed using low insertion loss phase-inverting variable attenuators, which exhibit high stability over a wide temperature range and process variations, and are configured for low power consumption and small form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive phase shifters (reflective-type or cascade of attenuators) are used, then device complexity is reduced, but phase-shifting resolution and stability deteriorate
Solution Approach 1:
The phase shifter is divided into multiple independent attenuator stages (e.g., 4 stages with 4 bits resolution), where each stage contributes to the overall phase shift through constructive interference. This segmentation allows fine phase resolution without requiring a single complex high-precision component.
Solution Approach 2:
The patent transitions from single-stage phase shifting to multi-stage amplitude modulation with constructive interference. By adding the dimension of multiple cascaded stages with controlled amplitude ratios, the system achieves fine phase resolution through amplitude control rather than direct phase manipulation.
2Reliability
If the number of radiating elements is increased to achieve sufficient EIRP and Gain, then antenna performance is improved, but power consumption increases
Solution Approach 1:
The patent changes the operational parameters of each phase shifter stage to operate at optimal power levels. By controlling the amplitude ratios and bias currents of the attenuators in each stage, the system achieves the required phase resolution with minimized power dissipation in each element.
Data Source
AI summary
A radiation pattern of a phased array antenna, comprising a plurality of antenna elements, may be dynamically modified using phase shifters to apply variable phase shifts between antenna elements. In a phased array antenna designed for airborne applications, the phase shifters may be required to enable a fine phase-shifting resolution and to operate over a wide temperature range. The phase shifters may also be required to perform while exhibiting small process variations, small form factor, low power consumption, and low loss. One possible solution to this is a passive vector-interpolating phase shifter configured to exhibit such characteristics.