Vehicle Door Handle Antenna Nesting for NFC and LF Range
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Solution Overview
Problem
Existing vehicle door handles face performance impairments due to limited space, affecting both near field communication (NFC) and low frequency (LF) antenna operations, resulting in reduced operation distances for these communication technologies.
Innovation Solution
The integration of a low frequency (LF) antenna and a near field communication (NFC) antenna within the vehicle door handle, where the NFC antenna is designed to encompass the LF antenna, allowing for a stacked arrangement that maximizes operational space and minimizes field coupling, ensuring both antennas operate effectively without impairing each other's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both NFC antenna and LF antenna are integrated in the door handle, then both communication functionalities are provided, but the limited space causes performance impairment and reduced operation distance
Solution Approach 1:
The patent implements a nested antenna configuration where the LF antenna is positioned inside the NFC antenna structure. The NFC antenna comprises an outer conductor and an inner conductor, with the LF antenna located in the space between these conductors. This nesting arrangement allows both antennas to coexist in the limited door handle space while maintaining their respective performance characteristics, as each antenna operates in its own electromagnetic field zone without significant mutual interference.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning the LF antenna in the radial dimension between the inner and outer conductors of the NFC antenna structure. This dimensional separation in the radial direction, combined with frequency separation, allows both antennas to operate simultaneously without performance degradation, effectively resolving the space-constraint contradiction.
2Volume of moving object
If NFC antenna and LF antenna are placed close together to save space, then device compactness is improved, but field coupling occurs and reduces operation distance
Solution Approach 1:
The nested configuration places the LF antenna within the structural boundaries of the NFC antenna, utilizing the space between the inner and outer conductors. This arrangement maintains compact overall dimensions while preserving sufficient electromagnetic field separation through the conductive structures, thereby maintaining operation distance despite compact packaging.
Solution Approach 2:
The inner conductor of the NFC antenna structure serves as an intermediary element that provides electromagnetic shielding between the LF antenna and the outer environment. This intermediary conductive structure helps contain and direct the electromagnetic fields, reducing unwanted coupling while maintaining compact dimensions.
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 operational area of the NFC antenna and maintains the performance of both antennas, allowing for secure and efficient communication, with the NFC field covering the entire door handle area and maintaining a homogeneous strength distribution, thus improving usability and functionality.
Implementation Method 1
a near field communication (NFC) device that is used as an access tool... The operation range of the near field communication technology operating at frequencies of about 13.56 MHz is typically short and therefore secure
Implementation Method 2
a passive entry system that uses low frequency (LF) communication technologies... The low frequency may relate to 125 kHz
Data Source
AI summary
A vehicle door handle for a motor vehicle is described, which includes an integrated transmitting and/or receiving device which comprises an LF antenna and a separately formed NFC antenna. The NFC antenna has a plurality of windings provided on a circuit board. The LF antenna has a plurality of coils wound around a core material formed separately from the circuit board. The NFC antenna encompasses a projection of the LF antenna on the circuit board.