Tunable Antenna Rejection Circuit for Stable Impedance Matching
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Solution Overview
Problem
Temperature fluctuations and environmental changes cause variations in antenna impedance, leading to performance issues in wireless communication devices, particularly in 5G-NR systems that rely on beamforming techniques, resulting in suboptimal data rates and user experience.
Innovation Solution
An adjustable rejection circuit with tunable impedance is integrated into the impedance tuner, utilizing an LC circuit with variable elements and a variable negative capacitance element to provide strong attenuation in specific frequencies, ensuring impedance matching and signal rejection without increasing the device's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature fluctuations and environmental changes occur, then antenna impedance varies, but beamforming performance deteriorates
Solution Approach 1:
The patent employs dynamic impedance tuning through variable capacitors that can be adjusted in real-time to compensate for environmental changes. The beamforming circuit continuously adapts its impedance parameters to maintain optimal performance across varying temperature and usage conditions, transforming a static impedance assumption into a dynamic adaptation mechanism.
Solution Approach 2:
The invention changes the impedance parameters of the beamforming circuit by adjusting capacitor values in response to detected environmental conditions. This parameter adjustment allows the system to maintain reliable beamforming performance despite variations in antenna impedance caused by temperature fluctuations or user handling.
2Reliability
If an impedance tuner with variable LC elements is used, then impedance matching improves, but circuit complexity increases
Solution Approach 1:
The beamforming circuit is designed to perform multiple functions: it simultaneously executes beamforming operations and impedance tuning. By integrating the impedance tuning capability into the existing beamforming architecture rather than adding a separate dedicated impedance matching circuit, the patent improves impedance matching reliability without proportionally increasing overall circuit complexity.
Solution Approach 2:
The patent merges the impedance tuning function with the beamforming circuit by incorporating variable capacitors directly into the beamforming network. This consolidation allows a single circuit to handle both signal beamforming and impedance adaptation, reducing the total component count compared to having separate dedicated circuits for each function.
3Productivity
If beamforming circuitry is added to enable high-bandwidth communication, then data rates improve, but device footprint increases
Solution Approach 1:
The patent combines multiple functions (beamforming, impedance tuning, and signal filtering) into a single integrated circuit architecture. By merging these functions rather than implementing them as separate discrete circuits, the design achieves high-bandwidth communication capabilities while minimizing the overall device footprint.
Solution Approach 2:
The beamforming circuit is designed as a multi-functional unit that simultaneously performs high-speed signal processing, impedance adaptation, and environmental compensation. This universal design allows the circuit to deliver high data rates without requiring additional dedicated circuits that would increase the device footprint.
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 solution enhances performance by maintaining optimal impedance matching and signal rejection across varying conditions, improving data rates and user experience without expanding the device's physical dimensions.
Implementation Method 1
An adjustable rejection circuit may be placed in parallel with the impedance tuner. In an exemplary aspect, the adjustable rejection circuit may include a variable negative capacitance element that provides strong attenuation in frequencies of interest
Implementation Method 2
The impedance tuner may include an LC circuit (inductor-capacitor circuit) with one or more elements of the LC circuit being variable
Data Source
AI summary
An adjustable rejection circuit with tunable impedance circuit is disclosed. In particular, a circuit is provided with an impedance tuner configured to match impedances for an antenna. The impedance tuner may include an LC circuit (inductor-capacitor circuit) with one or more elements of the LC circuit being variable. An adjustable rejection circuit may be placed in parallel with the impedance tuner. The adjustable rejection circuit may include a variable negative capacitance element that provides strong attenuation in frequencies of interest.