TSV Phase Shifter Layout for Low-Loss Beam Steering
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Solution Overview
Problem
Current phased array antenna systems face challenges in achieving efficient beam steering and impedance tuning due to high RF loss and limited design flexibility in on-chip interconnects, which restricts their performance, especially at high-MMW frequencies like 77 GHz and above.
Innovation Solution
The implementation of through-substrate-vias (TSVs) as functional phase shifters and tunable matching circuits provides lower loss and greater design flexibility, allowing for configurable phase shifts and impedance control using inductance and capacitance switches, enabling more effective beam steering and impedance tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If on-chip interconnects are used for phase shifting, then device integration is achieved, but RF loss increases and design flexibility is limited
Solution Approach 1:
The patent transitions from planar on-chip interconnects to three-dimensional TSV structures that extend vertically through the substrate. This dimensional change allows phase shifting functionality to be implemented in the vertical dimension rather than relying solely on horizontal trace routing, achieving lower RF loss while maintaining integration.
Solution Approach 2:
The patent changes the physical parameters of the interconnect structure by using TSVs with specific dimensions (diameter, depth, spacing) and materials (copper, tungsten, nickel) to optimize RF performance. The TSV geometry and material composition are carefully controlled to minimize RF loss while providing the required phase shifting capability.
2Device complexity
If on-chip interconnects are used for phase shifting, then device integration is achieved, but design flexibility is limited
Solution Approach 1:
The patent implements dynamically adjustable phase shifters using TSVs that can be reconfigured through switching mechanisms. The TSV-based structure allows for continuous or discrete phase adjustment, providing adaptability for different beam steering angles and frequency operations while maintaining integrated design.
Solution Approach 2:
The TSV structure serves multiple functions simultaneously: it acts as an interconnect, a phase shifter, and an impedance tuning element. This multi-functionality provides design flexibility for implementing various phased array configurations and beam forming algorithms within a single integrated structure.
3Loss of energy
If TSVs are used as functional phase shifters, then RF loss is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines the TSV formation process with the phase shifter fabrication process. The TSVs are created using standard semiconductor manufacturing techniques (drilling, plating, filling) that are then integrated with the phase shifter circuitry in the same fabrication sequence, reducing the need for additional manufacturing steps.
Solution Approach 2:
The TSV structures are formed and positioned in advance during the substrate preparation phase, before the final phase shifter circuitry is completed. This preliminary action allows the TSVs to serve as pre-configured phase shifting elements that simplify subsequent manufacturing steps and reduce overall process complexity.
4Area of stationary object
If TSVs are used as functional phase shifters, then area usage is minimized, but design complexity increases
Solution Approach 1:
The patent moves phase shifting functionality from the horizontal plane to the vertical dimension using TSVs. This allows the phase shifter to occupy minimal planar area while providing the required electrical length and phase shifting capability through the vertical TSV structure, effectively trading vertical space for horizontal area savings.
Solution Approach 2:
The TSV-based phase shifter structure allows for nested integration where multiple functional elements (interconnects, phase shifters, matching circuits) are combined within the same TSV structure or in close proximity, maximizing area utilization while managing design complexity through hierarchical integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces RF loss per degree phase change, enhances phase tuning range, and offers design flexibility, making it compatible with 6G frequencies and multi-band phased arrays, while minimizing area usage and maximizing performance.
Implementation Method 1
the phase shifter element has one of a first phase shift and a second phase shift, different from the first phase shift, based on a capacitance and an inductance of the signal line TSV
Implementation Method 2
the phase shifter element has one of a first phase shift and a second phase shift, different from the first phase shift, based on a capacitance and an inductance of the signal line TSV
Implementation Method 3
each respective one of the plural phase shifter elements comprises a signal line through-substrate-via (TSV) whose phase shift is configurable using an inductance switch and a capacitance switch
Data Source
AI summary
A phase shifter includes functional actively controlled phase-shift elements formed with TSVs. The phase shifter may include plural phase shifter elements each including: a signal line including a signal line through-substrate-via (TSV) in a substrate; a ground return line including a ground return line TSV in the substrate; a capacitance control line including a capacitance control line TSV in the substrate; and an inductance control line including an inductance control line TSV in the substrate, wherein the phase shifter element has one of a first phase shift and a second phase shift, different from the first phase shift, based on a capacitance and an inductance of the signal line TSV.