NFEMI Antenna Hybridizing Magnetic and Electrical Fields
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Solution Overview
Problem
Existing near-field electromagnetic induction (NFEMI) devices face interference from mechanical and electrical components, which degrades their communication range and susceptibility to interference, limiting their performance in wearable devices and other applications.
Innovation Solution
The NFEMI device incorporates a coil antenna coupled with conductive plates and a ground plane, where capacitors are strategically placed to generate or respond to electrical fields, enhancing the communication range by capacitively coupling the antenna structure with the ground plane, thereby reducing interference and improving signal robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil antenna is used for NFEMI communication, then magnetic field generation is achieved, but interference from mechanical and electrical components degrades communication range and signal robustness
Solution Approach 1:
The patent combines a coil antenna with conductive plates and a ground plane to create a hybrid antenna structure. The coil generates magnetic fields for NFEMI communication, while the conductive plates coupled to the ground plane generate electrical fields. This merging of magnetic and electrical field generation capabilities allows the system to achieve both NFEMI communication and reduced susceptibility to interference, as the electrical field component helps cancel out harmful interference from mechanical and electrical components.
Solution Approach 2:
The patent employs a composite antenna structure combining different materials and components: the coil (typically wound wire), conductive plates (conductive material), and ground plane (conductive substrate). This composite structure integrates the magnetic field generation capability of the coil with the electrical field generation and interference rejection capabilities of the conductive plates and ground plane, creating a system that overcomes the limitations of a simple coil antenna.
2Volume of moving object
If the NFEMI device is made smaller for wearable applications, then portability is improved, but communication range and performance may be limited
Solution Approach 1:
The patent merges the functions of magnetic field generation (coil) and electrical field generation (conductive plates with ground plane) into a single integrated antenna structure. This combination allows the compact device to achieve extended communication range and improved performance by utilizing both magnetic and electrical near fields, effectively overcoming the performance limitations typically associated with small-sized NFEMI devices.
3Reliability
If capacitors are added to couple the antenna structure with the ground plane, then electrical field generation is improved, but device complexity increases
Solution Approach 1:
The patent introduces capacitors as intermediary elements that couple the conductive plates to the ground plane. These capacitors serve as mediators that enable electrical field generation while providing several benefits: they block DC components, allow AC signal passage, and can be used to tune the resonant frequency of the antenna structure. The capacitors simplify the overall design by providing a straightforward method to achieve the desired electrical field generation without requiring complex circuitry.
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 configuration enhances the communication range and robustness of NFEMI devices, allowing for smaller dimensions with comparable performance to standard devices, and increases the signal link budget, making them suitable for portable and wearable applications.
Implementation Method 1
the coil is configured to generate or respond to a magnetic field
Implementation Method 2
the first conductive plate in combination with the ground plane is configured to generate or respond to an electrical field
Implementation Method 3
the first conductive plate in combination with the ground plane is configured to generate or respond to an electrical field
Data Source
AI summary
Example of a near-field electromagnetic induction (NFEMI) device, including: an NFEMI antenna, having a first conductive plate, a coil, a first signal feed connection, and a second signal feed connection; wherein the coil is configured to generate or respond to a magnetic field and is coupled to the first and second signal feed connections; wherein the first conductive plate is coupled to the first signal feed connection; and an electrical apparatus, having a ground plane, a first capacitor and a second capacitor; wherein the electrical apparatus is coupled to the first and second signal feed connections; wherein the first capacitor is coupled between the first signal feed connection and the ground plane; wherein the second capacitor is coupled between the second signal feed connection and the ground plane; and wherein the first conductive plate in combination with the ground plane is configured to generate or respond to an electrical field.