Passive Phase Shifter Layout for Accurate mmWave Beam Pointing
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Solution Overview
Problem
Existing mmWave phased array transceivers face challenges with compact design, low power consumption, and accurate beam pointing due to design constraints such as small antenna-in-package area, high heat density, and signal-to-noise degradation from beam broadening.
Innovation Solution
A phase shifting apparatus utilizing a passive phase shifter with bi-directional control, low insertion loss, and calibration-free operation, implemented with a compact chip area and multiple parallel transmission lines connected via transistor switch networks, allowing for accurate phase control and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large-scale phased array transceiver is used to overcome severe path loss and limited performance at mmWave frequencies, then channel capacity and spectral efficiency are improved, but the antenna-in-package area and power consumption increase
Solution Approach 1:
The phased array transceiver is divided into multiple independent antenna elements that can be independently controlled. Each element contains its own phase shifter and signal processing components, allowing the system to achieve large-scale array performance while maintaining compact individual element footprints. This segmentation enables distributed signal processing across the array aperture.
Solution Approach 2:
The patent implements antenna elements with nested or integrated structures where feed networks, phase shifters, and antenna radiating elements are combined in a compact arrangement. The feed network is integrated within the antenna substrate, and phase shifting components are nested within the signal path between the antenna element and the output, maximizing space utilization in the antenna-in-package structure.
2Productivity
If more antenna elements are integrated into a massive MIMO array module to boost spectral efficiency, then spectral efficiency is improved, but heat density and power consumption increase
Solution Approach 1:
The patent implements local thermal management by distributing heat-generating components across the array structure and providing localized heat dissipation paths for each antenna element. The feed network and phase shifter components are positioned to optimize thermal coupling with heat sinks, and the substrate material is selected for its thermal conductivity properties to conduct heat away from active regions.
3Measurement precision
If array calibration is performed to ensure accurate beam pointing, then beam pointing accuracy is improved, but system complexity and processing time increase
Solution Approach 1:
The patent incorporates calibration features directly into the antenna element structure, such as built-in reference signals, test ports, and known phase reference paths that are manufactured as part of the antenna substrate. These preliminary calibration elements are embedded during fabrication, eliminating the need for complex post-assembly calibration procedures and reducing system complexity.
4Area of stationary object
If a compact integrated circuit area per element is used to reduce antenna-in-package size, then area is reduced, but phase control accuracy and signal quality deteriorate
Solution Approach 1:
The patent transitions from planar integration to three-dimensional stacking of circuit layers. Phase shifters, feed networks, and control logic are distributed across multiple vertical layers of the integrated circuit, allowing compact horizontal footprint while maintaining sufficient separation and interconnection length for accurate phase control. This vertical dimensionality change enables high-density integration without sacrificing signal integrity.
Data Source
AI summary
A phase shifting apparatus and process can be configured to provide enhanced control of time delays associated with transmission of data while also helping to avoid data loss that may occur via the transmission of data. Embodiments can be configured to account for frequency to control for time delay and also help avoid data loss via transmission of data that can occur along multiple parallel transmission lines that can be interconnected to teach other via a series of switches, for example. In some embodiments, the transmission lines and switches can be positioned in a chip (e.g. nanochip, microchip, transmission device chip, radio frequency chip, semiconductor on insulator chip, etc.) that can be included in an electronic device (e.g. telecommunication device, computer system, control system, etc.).