Wireless Node Antenna Tuning via Autonomous Impedance Matching
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Solution Overview
Problem
Existing wireless nodes face challenges with antenna detuning due to environmental influences and manufacturing tolerances, leading to reduced radiated transmit power, receive sensitivity, and increased energy consumption, which are not effectively addressed by existing methods that require external connections and high energy expenditure.
Innovation Solution
A method for adjusting the impedance and resonant frequency of the antenna within the wireless node using a circuit with switchable capacitances and inductances, coupled to the antenna, allowing autonomous tuning without external connections, and utilizing a microcontroller for closed-loop control to optimize antenna matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna tuning is performed using external bidirectional radio communication between smart meter and concentrator, then antenna matching can be improved, but the method requires greater energy expenditure and cannot be performed autonomously
Solution Approach 1:
The wireless node autonomously performs antenna tuning by coupling a test signal through the antenna, measuring the reflected signal, and adjusting matching components without requiring external communication infrastructure. The node serves itself by independently detecting antenna detuning and correcting it through automated impedance matching adjustment.
Solution Approach 2:
The patent extracts the antenna tuning function from the external concentrator system and relocates it entirely within the wireless node. By removing the dependency on bidirectional radio communication with external equipment, the system achieves autonomous operation and reduces energy consumption associated with multiple communication rounds.
2Reliability
If antenna detuning occurs due to environmental influences and manufacturing tolerances, then wireless range and receive sensitivity are reduced, but existing methods require external connections and high energy expenditure
Solution Approach 1:
The patent combines the antenna testing function, measurement function, and impedance adjustment function into a single integrated circuit within the wireless node. The test signal generator, signal analyzer, and matching component controllers are merged into one autonomous system that performs all tuning operations internally without external equipment.
Solution Approach 2:
The wireless node's communication circuit is designed to perform multiple functions: normal data transmission, test signal generation for antenna tuning, and reflected signal analysis. This multi-functional approach eliminates the need for separate dedicated testing equipment and enables autonomous antenna adaptation using existing node resources.
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
Enables independent antenna tuning to compensate for detuning, maintaining transmit power, receive sensitivity, and reducing energy consumption, thereby ensuring efficient and energy-saving operation of wireless nodes.
Implementation Method 1
A circuit which acts on the antenna and adjusts the impedance and/or the resonant frequency of the antenna is provided
Implementation Method 2
utilizing a microcontroller for closed-loop control to optimize antenna matching
Implementation Method 3
a radio signal, for instance a radiofrequency (RF) signal, or at least a portion thereof, is coupled out of the antenna and/or out of the transmit path of the wireless node
Data Source
AI summary
A method improves antenna matching for a wireless node, preferably of a sensor wireless node and/or actuator wireless node. A radio signal, or at least a portion thereof, is coupled out of the antenna and/or out of the transmit path of the wireless node. The impedance and/or the resonant frequency of the antenna is determined therefrom in the wireless node, and the impedance and/or the resonant frequency of the antenna is adjusted according to the determined impedance and/or resonant frequency by a circuit acting on the antenna.