Hybrid-Coupler Vector Modulator for Wideband Linear Signal Control
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Solution Overview
Problem
Current vector modulators have limited bandwidth and dynamic range, leading to restricted signal modulation capabilities and inefficiencies in phase and amplitude adjustments, particularly due to their narrowband and nonlinear behavior.
Innovation Solution
A hybrid coupler-based wideband vector modulator design using continuous transmission lines and controllable attenuators, along with gain slope equalizers, to enhance dynamic range and accuracy in phase and amplitude modulation, allowing for wider frequency tuning and improved linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current vector modulator architecture with active components or passive switches is used, then amplitude and phase modulation can be achieved, but dynamic range is limited and nonlinear behavior occurs at high power end
Solution Approach 1:
The patent replaces active components and passive switches with a purely passive transmission line-based architecture. The system uses continuous transmission lines configured as hybrid couplers to achieve signal splitting and combining, eliminating the need for active switching elements. This substitution of mechanical/electronic switching systems with transmission line structures resolves the nonlinearity issue while maintaining full dynamic range capability through purely passive signal manipulation.
Solution Approach 2:
The patent changes the fundamental operating parameters by using transmission line electrical lengths and characteristic impedances to control signal distribution. Instead of using switch states or active component gain settings, the system achieves modulation by varying the electrical path lengths and impedance transformations through the transmission line network. This parameter change enables linear operation across the full dynamic range.
2Device complexity
If narrowband vector modulator design is used, then circuit complexity can be reduced, but bandwidth is limited and frequency tuning range is restricted
Solution Approach 1:
The patent creates a universal transmission line structure that performs multiple functions simultaneously. The same continuous transmission lines serve as signal paths, hybrid couplers, phase shifters, and impedance transformation elements. This multi-functionality eliminates the need for separate narrowband tuning circuits or frequency-specific components, enabling wideband operation without proportionally increasing circuit complexity.
Solution Approach 2:
The patent introduces dynamic adaptability through variable electrical lengths and adjustable impedance transformations in the transmission lines. By making the transmission line parameters dynamically可调 (adjustable), the system can adapt to different frequency ranges and bandwidth requirements while maintaining a relatively simple overall structure compared to multiple fixed narrowband circuits.
3Measurement precision
If ideal I and Q vectors are required, then signal accuracy is improved, but certain magnitudes and phases cannot be achieved with current architecture
Solution Approach 1:
The patent adds an additional dimensional degree of freedom by utilizing the full four-port capability of the transmission line hybrid couplers. Instead of being constrained to traditional two-branch I/Q modulation, the system exploits the complete vector space available through the transmission line network, enabling access to all possible magnitude and phase combinations. This dimensional expansion in the signal space allows ideal I and Q vectors to be achieved across the entire achievable range.
Data Source
AI summary
Vector modulation is illustrated. A method includes receiving an input signal. The input signal is split into a first 0° output and a 90° output. The first 0° output is split into a second 0° output and a first 180° output using a continuous transmission line. The 90° output is split into a third 0° output and a second 180° output using a continuous transmission line. The second 0° output, the first 180° output, the third 0° output, and the second 180° output are modulated. The modulated second 0° output, the first 180° output, the third 0° output, and the second 180° output are recombined to produce an output signal, where all four of the modulated second 0° output, the first 180° output, the third 0° output, and the second 180° output are used to create the output signal.