Phased Array Antenna Current and Voltage Limiters
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Solution Overview
Problem
Phased array antenna systems in 5G cellular handsets face damage from chaotic impedance fluctuations and high voltage standing wave ratios (VSWRs) due to user body placement variations, which can damage radio frequency power amplifiers.
Innovation Solution
A phased array antenna system with amplifier circuitries that include current and voltage limiters to regulate current and voltage within safe ranges, and optional overcurrent and overvoltage detectors to dynamically adjust the bias point and switch between antenna systems for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phased array antenna systems are used in 5G cellular handsets to meet increased bandwidth and data rate demands, then productivity and communication performance are improved, but the power amplifiers become vulnerable to damage from chaotic impedance fluctuations and high VSWRs caused by user body placement variations
Solution Approach 1:
The patent applies preliminary action by implementing protection mechanisms (current limiters, voltage limiters, and detectors) before damage can occur to the power amplifiers. These components are pre-configured to detect and respond to hazardous conditions such as high VSWR and excessive current or voltage, preventing damage before it happens to the power amplifiers driving the phased array antenna system
Solution Approach 2:
The patent implements feedback through overcurrent detectors and overvoltage detectors that continuously monitor the operating conditions of the power amplifiers. When abnormal conditions are detected (such as excessive current or voltage due to impedance fluctuations), the system receives feedback signals and can adjust operation or activate protection mechanisms to maintain reliable operation while preserving productivity
2Reliability
If current limiters and voltage limiters are added to protect power amplifiers, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple protection functions into integrated circuits. The current limiter and voltage limiter are combined within the amplifier circuitry, and overcurrent detectors and overvoltage detectors are integrated to provide comprehensive protection through a unified system rather than separate discrete components, thereby improving reliability while managing device complexity
Solution Approach 2:
The protection system operates autonomously through self-service mechanisms. The overcurrent detectors and overvoltage detectors automatically monitor conditions and trigger protection responses without requiring external control or intervention. The system serves itself by detecting hazards and activating limiters independently, improving reliability while minimizing the complexity of control circuitry
Data Source
AI summary
A phased array antenna system having a plurality of antenna elements arranged into an array is disclosed. Each of a plurality of amplifier circuitries has an output terminal coupled to a corresponding one of the plurality of antenna elements and includes a power amplifier having a control terminal coupled to an input terminal. The power amplifier has a first current terminal coupled to the output terminal and a second current terminal coupled to a fixed voltage node. Further included in each of the plurality of amplifier circuitries is a current limiter having a bias terminal coupled to the control terminal of the power amplifier to adjust a bias point of the power amplifier to limit current flowing through the first current terminal and the second current terminal to within a predetermined current range. Some embodiments also include a voltage limiter to limit voltage amplitude at the output terminal.