Distributed Power Supply for Phased Array Antennas
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Solution Overview
Problem
Phased array systems face challenges with power supply reliability and efficiency due to shared power supplies among radio frequency circuits, leading to potential system failures and increased complexity and cost in PCB fabrication, especially at high frequencies where low voltage and high current requirements are difficult to manage.
Innovation Solution
Implementing a distributed power supply system where each radio frequency circuit has its own local power supply circuit, allowing for independent operation and fault tolerance, reducing parasitic capacitance, and enabling efficient tapering and dynamic power control to minimize DC power consumption and improve beam pattern quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared power supply is used for multiple radio frequency circuits, then the system complexity is reduced, but the reliability decreases because a single point of failure can disrupt the entire system
Solution Approach 1:
The power supply system is divided into multiple independent distributed power supply circuits, each serving specific radio frequency circuits. This segmentation isolates failures to individual segments, preventing system-wide disruptions while maintaining overall system functionality.
Solution Approach 2:
Each distributed power supply circuit is optimized locally to provide specific voltage rails (e.g., 1.8V, 3.3V, 5V) to nearby radio frequency circuits. This local quality approach reduces parasitic effects and improves power delivery while maintaining modular independence for reliability.
2Device complexity
If multiple voltage outputs are provided by a single power supply, then the device complexity is reduced, but the manufacturing cost and PCB fabrication complexity increase due to additional layers required
Solution Approach 1:
Multiple power supply functions are distributed across separate independent circuits rather than integrated into a single multi-output power supply. This segmentation allows each circuit to be implemented on separate PCB layers or modules, simplifying PCB fabrication while achieving the same functional complexity.
Solution Approach 2:
The power supply architecture transitions from a vertical integration approach (multiple outputs in one device) to a horizontal distribution approach (multiple independent circuits across the PCB). This dimensional change simplifies manufacturing by allowing standard single-layer or multi-layer PCB techniques to be used for each distributed circuit.
3Speed
If radio frequency circuits are reduced to lower node size for high frequency operation, then the operating frequency increases, but the supply voltage decreases to under 1 volt making power delivery difficult
Solution Approach 1:
Distributed power supply circuits are placed in immediate proximity to the low-voltage radio frequency circuits they serve. This local placement minimizes parasitic inductance and resistance in the power delivery path, enabling reliable delivery of under 1 volt supplies to high-frequency, low-node circuits.
Solution Approach 2:
The distributed power supply circuits act as intermediary elements between the main power source and the sensitive low-voltage radio frequency circuits. These intermediaries provide localized voltage regulation and buffering, ensuring stable power delivery despite the low voltage requirements imposed by high-frequency operation.
4Reliability
If distributed power supply circuits are implemented for each radio frequency circuit, then the reliability and fault tolerance improve, but the device complexity increases
Solution Approach 1:
The power supply system is segmented into multiple independent distributed circuits, each with its own failure isolation. This segmentation inherently improves reliability through fault tolerance while the modular nature of the segments keeps individual circuit complexities manageable and reusable.
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
The distributed power supply system enhances fault tolerance, reduces power consumption, and simplifies design and testing, while minimizing wire losses and PCB complexity, thereby increasing the mean time between failures and maintaining spectral efficiency in phased array systems.
Implementation Method 1
each of the distributed power supply circuits configured to receive the supply power from the power supply circuit and generate radio frequency supply powers for one of the radio frequency circuits
Data Source
AI summary
A phased array system includes an antenna system includes multiple antennas configured to transmit or receive signals and a power supply circuit configured to generate a supply power and provide the supply power to a plurality of distributed power supply circuits. The phased array system includes distributed power supply circuits, each of the plurality of distributed power supply circuits configured to receive the supply power from the power supply circuit and generate radio frequency supply powers for one multiple radio frequency circuits. The phased array system includes radio frequency circuits, each of the radio frequency circuits configured to cause one of the antennas to transmit or receive the signals based on the plurality of radio frequency supply powers.