Hybrid-Coupler Phase Shifter With Impedance Matching for Phase Accuracy
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Solution Overview
Problem
Phase shifters using hybrid couplers face challenges in maintaining phase accuracy due to variations in load impedance and capacitance, leading to instability and difficulty in securing robustness.
Innovation Solution
A phase shifter design incorporating a hybrid coupler circuit with specific impedance matching circuits, including resistance and capacitance elements, and inductive components to stabilize signal phase and amplitude, thereby compensating for capacitance variations and improving phase accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hybrid coupler is used for phase shifting, then phase shift functionality is achieved, but phase accuracy deteriorates due to variations in load impedance and capacitance
Solution Approach 1:
The patent applies parameter changes by introducing variable impedance transformation circuits that dynamically adjust their impedance transformation ratio based on detected capacitance values. This allows the system to compensate for capacitance variations in the hybrid coupler, maintaining stable phase accuracy despite changes in electrical characteristics. The impedance transformation ratio is specifically adjusted to counteract the effects of capacitance variation, thereby resolving the contradiction between phase accuracy and robustness.
2Measurement precision
If impedance matching is performed with fixed parameters, then circuit simplicity is maintained, but phase accuracy deteriorates under varying capacitance conditions
Solution Approach 1:
The patent implements dynamics by transitioning from fixed impedance matching to dynamic impedance matching. The impedance matching circuit now includes variable impedance transformation circuits whose parameters can be adjusted in real-time based on the actual capacitance conditions. This dynamic adaptation allows the system to maintain high phase accuracy across varying capacitance conditions while adding only moderate complexity through the use of controllable impedance transformation elements.
3Measurement precision
If capacitance variation compensation is implemented, then phase accuracy improves, but power consumption increases due to additional active components
Solution Approach 1:
The patent applies self-service by implementing a feedback mechanism where the system automatically detects capacitance variations and adjusts its own impedance transformation ratio accordingly. The phase shifter monitors its own electrical characteristics and performs self-compensation without requiring external intervention or complex control systems. This self-adjusting capability improves phase accuracy while minimizing power consumption by only activating adjustment mechanisms when capacitance variations are detected.
Data Source
AI summary
A phase shifter capable of improving phase accuracy by a simple method is provided. The phase shifter includes a hybrid coupler circuit including inductors with mutual inductances, an amplifying circuit, an impedance matching circuit provided between the hybrid coupler circuit and the amplifying circuit. The impedance matching circuit includes a first resistance element connected to an output node of the hybrid coupler circuit, a capacitance element connected between the first resistance element and the ground line in series, another inductor connected in parallel with the first resistance element, and a second resistance element provided between the inductor and the ground line in series.