Frequency Tunable Bi-Directional Active Phased-Array Processing
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Solution Overview
Problem
Conventional phased-array antenna designs face challenges in achieving frequency tunability, compact size, high phase and amplitude resolution, and efficient signal processing due to limitations in bi-directional active phase shifters and combiners/splitters, leading to large die areas and signal loss.
Innovation Solution
A frequency tunable bi-directional phased-array processing system utilizing a bi-directional vector modulator with active combining and dividing, employing shared matching networks and complementary transistor cores for variable gain adjustment, eliminating passive components and reducing parasitic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phased-array antenna designs use separate TX and RX paths with high performance amplifiers and switches, then signal processing performance is improved, but die area increases and routing complexity increases
Solution Approach 1:
The patent combines separate TX and RX signal paths into a single shared bi-directional amplifier. The amplifier can operate in transmit mode or receive mode by switching the signal flow direction, eliminating the need for separate amplifiers and reducing die area while maintaining signal processing performance
Solution Approach 2:
The bi-directional amplifier serves multiple functions: it acts as a transmit amplifier when signal flows from input to output, and as a receive amplifier when signal flows from output to input. This multi-functionality replaces what would traditionally require two separate amplifiers, reducing overall device complexity and area
2Adaptability or versatility
If conventional designs use input and output switches for bidirectional amplification, then signal direction switching is enabled, but signal loss increases due to switch losses
Solution Approach 1:
The patent removes the lossy input and output switches from the signal path by using a true bi-directional amplifier architecture. The switching function is achieved internally within the amplifier through controlled signal flow direction rather than external switches, eliminating switch-related signal losses
Solution Approach 2:
The bi-directional amplifier itself acts as an intermediary that enables signal direction switching without requiring external switches. The amplifier's internal architecture allows it to mediate between transmit and receive modes while maintaining signal integrity and minimizing loss
3Adaptability or versatility
If frequency tunability is added to support multiple frequency bands, then adaptability to different frequency bands is improved, but device complexity increases
Solution Approach 1:
The patent implements frequency tuning capability that allows the bi-directional amplifier to dynamically adjust its operating frequency. This dynamic adjustment enables the same amplifier to operate across multiple frequency bands without requiring separate fixed-frequency amplifiers, reducing overall device complexity while maintaining frequency adaptability
Data Source
AI summary
A novel frequency tunable bi-directional phased array processing consisting of variable phase shifting and amplitude adjustment which employs a vector modulator and active combiner and splitter is proposed. Advantages of the proposed bi-directional a phased array processing includes the following 1) compact size; 2) high efficiency; 3) reduced passive trace loss and power consumption; 4) active current combining; 5) high input-output isolation; 6) high resolution and precise gain control and unequal combining or splitting; 7) phase-invariant amplifier design; 8) high accuracy and high-resolution phase shifter; 9) frequency tunability, within a small frequency range and/or a large frequency range; and 10) optimal unequal combining or splitting.