Phase-Mode Beam Steering Reduces Phase Shifter Count
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Solution Overview
Problem
Conventional beam-steering systems for planar array antennas face challenges in efficiently steering the main lobe over a limited range in two dimensions due to the need for numerous variable phase shifters and transceiver modules, which are costly and difficult to integrate, especially at shorter wavelengths like millimeter-waves.
Innovation Solution
A two-dimensional phase-mode enabled beam-steering system that uses a fixed number of variable phase shifters, hybrid splitter/combiners, and mixers to steer the electromagnetic radiation beam of a circular or polygonal ring array, allowing for independent control of the beam's direction using a phase-mode feed structure with 0-th, +1-st, and -1-st order phase-modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional beam-steering systems use variable phase shifters and transceiver modules for each antenna element, then beam steering capability is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the beam steering control into three independent phase-mode channels (0-th, +1-st, and -1-st order) instead of controlling each antenna element individually. This segmentation allows the system to achieve 2D beam steering by combining a limited number of phase shifters applied to specific phase-mode excitations, dramatically reducing the total number of phase shifters and transceiver modules required while maintaining full beam steering capability.
2Measurement precision
If more antenna elements are added to improve beam steering precision, then beam control accuracy improves, but the number of required phase shifters and transceiver modules increases
Solution Approach 1:
The patent implements a universal phase-mode feed structure where a fixed set of three phase shifters (applied to the 0-th, +1-st, and -1-st order phase modes) can control beams for antenna arrays of any size. This multi-functional approach allows the same hardware configuration to achieve precise beam control regardless of the number of antenna elements, eliminating the direct correlation between array size and phase shifter quantity.
3Adaptability or versatility
If conventional approaches are used for millimeter-wave frequencies, then beam steering is possible, but cost and complexity increase due to the non-scaling nature of phase shifters and TRs
Solution Approach 1:
The patent fundamentally changes the control parameter from individual element phase control to phase-mode control. By transforming the problem into controlling three specific phase-mode parameters (amplitude and phase for each of the three modes), the system achieves millimeter-wave beam steering with a fixed, minimal hardware configuration that scales independently of frequency, thereby reducing cost and deployment complexity.
Data Source
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AI summary
A method for operating a beam-steering system includes receiving a signal to be tracked, generating a first phase-mode signal, a second phase-mode signal and a third phase-mode signal from the received signal, and generating a first intermediate auxiliary signal, a second intermediate auxiliary signal, and a first intermediate main signal in accordance with the phase-mode signals. The method also includes deriving a first steering signal proportional to a circumferential steering angle of the received signal from the first intermediate main signal and the first auxiliary signal, and deriving a second steering signal proportional to a radial steering angle of the received signal from the second intermediate auxiliary signal and the first intermediate main signal.