Phase-Locked Coil Assembly for Stable Multi-Band Wireless Links
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Solution Overview
Problem
The challenge in wireless communication devices is to maintain stable radio communication across various frequency bands while accommodating multiple antenna modules in a limited space, particularly when the devices interact with external objects, such as the human body, which affects capacitance and impedance.
Innovation Solution
A wireless communication apparatus featuring a coil assembly with a phase locking circuit and a negative resistor, which generates a control signal to lock the oscillation frequency and compensate for variations in capacitance, allowing for biometric data generation and efficient communication across multiple bandwidths by controlling the capacitance of a variable capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antenna modules are mounted to transmit and receive wireless power and signals of various frequency bands, then the wireless power transmission rate and data transmission rate are increased, but the device size and complexity increase
Solution Approach 1:
The coil assembly is designed to serve multiple functions: it acts as both a wireless power transmission antenna and a wireless communication antenna across different frequency bands. By making the coil assembly multi-functional, the patent eliminates the need for separate antenna modules for different purposes, thereby increasing transmission rates while avoiding the size increase that would result from mounting multiple dedicated antenna modules
Solution Approach 2:
The patent combines wireless power transmission and wireless communication functions into a single coil assembly structure. This merging of functions allows the system to achieve both power and data transmission capabilities without requiring physically separate antenna modules, thus improving productivity while constraining device volume
2Volume of moving object
If the coil assembly size is reduced to fit limited mounting space, then the device size is reduced, but the oscillation frequency stability deteriorates
Solution Approach 1:
The patent employs a phase locking circuit that dynamically adjusts the oscillation frequency based on feedback from the oscillator. This dynamic control mechanism compensates for frequency variations caused by the small coil assembly size, environmental factors, and impedance changes, thereby maintaining frequency stability despite the reduced physical dimensions of the coil assembly
Solution Approach 2:
The phase locking circuit implements a feedback mechanism that continuously monitors the oscillation frequency and adjusts the variable capacitor to maintain the desired frequency. This feedback control system ensures that even though the coil assembly is small and susceptible to external influences, the oscillation frequency remains stable through real-time correction
3Adaptability or versatility
If the oscillation frequency is adjusted to adapt to impedance changes, then the adaptability to different environments is improved, but the frequency stability deteriorates
Solution Approach 1:
The phase locking circuit dynamically adjusts the oscillation frequency in response to impedance changes detected in the environment. This dynamic adaptation allows the system to maintain optimal performance across different conditions (such as contact with external objects or implantation in body) while the feedback mechanism ensures that the frequency returns to or maintains the target frequency, thus achieving both adaptability and stability
Solution Approach 2:
The patent changes the capacitance parameter of the variable capacitor controlled by the phase locking circuit to adapt to impedance variations. By adjusting this electrical parameter, the system can accommodate different environmental conditions and impedance levels while maintaining frequency stability through the phase locking mechanism that continuously corrects frequency deviations
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 stable communication across different frequency bands, including body and wireless channels, by maintaining the oscillation frequency and generating biometric data through changes in capacitance, even when the device is in contact with an external object, thus ensuring reliable communication and sensing capabilities.
Implementation Method 1
The oscillation frequency may be determined based on the variable capacitor and a coil included in the coil assembly
Implementation Method 2
The phase locking circuit may be further configured to compensate for a variation in the oscillation frequency by controlling a capacitance of the variable capacitor in response to a change in impedance of the wireless communication apparatus
Implementation Method 3
The controller may be further configured to detect a capacitance of the variable capacitor, and determine that at least a portion of the coil assembly is in contact with an external object, in response to the capacitance of the variable capacitor being less than a threshold capacitance
Data Source
AI summary
A wireless communication apparatus may include: an oscillator including a coil assembly exposed to an outside of the wireless communication apparatus, a variable capacitor, and a negative resistor; and a phase locking circuit connected to the coil assembly and the negative resistor. The phase locking circuit may be configured to generate a control signal to lock an oscillation frequency of the oscillator based on an oscillation signal generated by the oscillator, and provide the generated control signal to the variable capacitor.