Adaptive Impedance Matching Network for Antenna Load Correction
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Solution Overview
Problem
Conventional mobile wireless communications devices face inefficiencies in impedance matching between antennas and power amplifiers due to varying environmental conditions and frequency dependencies, leading to high Voltage Standing Wave Ratio (VSWR) and power wastage.
Innovation Solution
A mobile wireless communications device with an adjustable impedance matching network, comprising adjustable capacitance and inductance elements, and an impedance sensor, controlled by a processor that calculates and sets new values for these elements to match the antenna load impedance with the power amplifier impedance, iteratively refining the match until a threshold is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed matching network is used, then the device complexity is reduced, but the impedance matching efficiency deteriorates due to varying environmental conditions and frequency changes
Solution Approach 1:
The patent implements an adjustable matching network where impedance elements (capacitors and inductors) can be dynamically changed based on detected impedance conditions. The processor controls switches to reconfigure the matching network topology, transforming it from a static to a dynamic system that adapts to environmental changes and frequency variations, thereby maintaining optimal power transfer efficiency without excessive complexity
Solution Approach 2:
The patent employs a feedback mechanism where the impedance of the antenna system is continuously detected and fed back to the processor. Based on this feedback, the processor automatically adjusts the matching network configuration to optimize impedance matching. This closed-loop control system resolves the contradiction by enabling adaptive optimization without requiring overly complex manual intervention systems
2Loss of energy
If the matching network is made adjustable to adapt to varying conditions, then the impedance matching efficiency is improved, but the device complexity increases
Solution Approach 1:
The matching network transitions from a fixed to a dynamic configuration using electronically controllable switches (e.g., MOSFETs) that can reconfigure the circuit topology. This dynamic adjustment capability allows the system to optimize power transfer efficiency across varying conditions while keeping the physical structure relatively compact and manageable
Solution Approach 2:
The patent changes the impedance parameters of the matching network by switching between different capacitor and inductor combinations. The processor controls the switching elements to select appropriate impedance values based on detected conditions, enabling efficient adaptation without requiring a completely complex redesign of the entire matching network structure
3Adaptability or versatility
If conventional impedance matching techniques are used, then the initial setup is simple, but the adaptability to environmental changes and frequency hopping deteriorates
Solution Approach 1:
The system uses impedance detection feedback to automatically adjust matching network parameters. The detector monitors the antenna impedance, and the processor uses this information to control the switching elements, creating a self-adjusting system that adapts to environmental changes and frequency hopping without requiring complex manual intervention or overly sophisticated control algorithms
Solution Approach 2:
The matching network system performs self-adjustment through automated detection and control. The impedance detector continuously monitors system conditions, and the processor automatically reconfigures the matching network without external intervention, enabling the system to serve itself and maintain optimal performance across varying conditions while keeping the control architecture relatively simple
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
This solution enables quick and accurate impedance matching, reducing VSWR and power wastage, while allowing the use of cheaper components due to improved convergence and tolerance in tuning, thus enhancing the efficiency and cost-effectiveness of the device.
Implementation Method 1
An impedance detector is coupled to the input of the matching network. The impedance detector measures the impedance at the input of the matching network.
Implementation Method 2
An adjustable impedance matching network may be coupled between the power amplifier and the antenna, and may comprise at least one adjustable impedance element.
Implementation Method 3
The at least one adjustable impedance element may comprise at least one adjustable capacitance and at least one adjustable inductance coupled thereto.
Implementation Method 4
a power amplifier having an amplifier impedance
Data Source
AI summary
A mobile device includes an adjustable impedance matching network coupled between a power amplifier and an antenna and has an adjustable impedance element. An impedance sensor is coupled between the power amplifier and adjustable impedance matching network. A processor is configured to a) calculate a corrected antenna load impedance based upon a sensed impedance at inputs of the impedance matching network and a current value of the adjustable impedance element, and b) determine a new value for the adjustable impedance element based upon the corrected antenna load impedance. The processor is also configured to c) set the adjustable impedance element to the new value, and d) sense a new impedance at the inputs and determine if the sensed new impedance is within a threshold value of the power amplifier impedance, and repeat steps a), b), and c) if the sensed new impedance is not within the threshold value.