Hybrid RF Inductive Loop Antenna for Compact Biometric Devices
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Solution Overview
Problem
Existing biometric monitoring devices are often complex and designed for single activities, and recent advancements in sensor and power source miniaturization have led to the need for compact, versatile devices that can seamlessly integrate multiple functionalities and improve data accuracy while being unobtrusive and user-friendly.
Innovation Solution
The development of a hybrid RF/inductive loop antenna system that includes a ground plane, radio-frequency radiator, shorting post, feed post, and a multi-turn inductive loop, configured to form an inverted-F or planar inverted-F antenna, which enables efficient electromagnetic signal production and reception, and can be integrated with NFC tags and sensors for biometric data collection, while optimizing size and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional antenna design is used, then electromagnetic signal production and reception is achieved, but the device size becomes too large for compact biometric monitoring applications
Solution Approach 1:
The patent combines an inductive loop antenna with an inverted-F antenna (IFA) into a hybrid structure. The inductive loop provides magnetic field coupling for near-field communication, while the IFA provides efficient electromagnetic radiation for longer-range communication. This merging allows a single antenna system to fulfill multiple functions that would traditionally require separate antenna structures, thereby reducing overall device volume while maintaining signal production and reception capabilities.
Solution Approach 2:
The hybrid antenna design enables the antenna system to perform multiple functions: it can operate as an inductive loop for near-field magnetic coupling, as an inverted-F antenna for far-field electromagnetic radiation, and potentially both simultaneously. This multi-functionality eliminates the need for separate specialized antennas, reducing the overall volume required in compact biometric monitoring devices while ensuring reliable signal transmission across different operational modes.
2Adaptability or versatility
If multiple functionalities are integrated into a single device, then device versatility is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple antenna functionalities into a single hybrid structure by combining the inductive loop and inverted-F antenna elements. This merging reduces the number of separate components needed, thereby reducing structural complexity while maintaining the versatility to perform near-field magnetic coupling, far-field electromagnetic radiation, and biometric data collection functions within a unified device architecture.
3Volume of moving object
If the radiator is positioned close to the ground plane, then device size is reduced, but electromagnetic signal performance deteriorates
Solution Approach 1:
The hybrid antenna structure merges the inductive loop and inverted-F antenna in such a way that the IFA's radiator can be positioned close to the ground plane (reducing device size) while the inductive loop provides alternative magnetic field coupling paths that compensate for the degraded electromagnetic signal performance. This combination allows the system to maintain reliable signal transmission even when the radiator-ground plane distance is minimized for compactness.
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 allows for compact, user-friendly biometric monitoring devices that can accurately collect and transmit various physiological and environmental data, enhancing user interaction and data reliability with improved power management and reduced complexity.
Implementation Method 1
the radiator, the ground plane, the shorting post, and the feed post may together form an inverted-F antenna (IFA) or planar inverted-F antenna (PIFA) configured to produce and receive electro-magnetic radio-frequency signals
Implementation Method 2
the inductive loop may be configured to inductively couple with a near-field magnetic field
Data Source
AI summary
Biometric monitoring devices, including various technologies that may be implemented in such devices, are discussed herein. Additionally, techniques, systems, and apparatuses are discussed herein for providing a hybrid antenna including an RF radiator and an electrically coupled inductive loop. The hybrid antenna is capable of providing both RF and induction functionality, e.g., radio frequency transmission/reception capabilities for Bluetooth as well as near-field-communications (NFC) functionality via the inductive loop. The inductive loop may be in conductive contact with the RF radiator or may be inductively coupled with the RF radiator and not in conductive contact with the RF radiator. The inductive loop may act as a planar element of a planar inverted-F antenna (PIFA).