Integrated LF HF Antenna with Replaceable Metallized Cap
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Solution Overview
Problem
Existing inductive antenna devices for HF and LF communication struggle to integrate both functionalities efficiently, often requiring multiple components and physical space, while also lacking the ability to operate effectively across the desired frequency ranges and offering variable HF antenna performance.
Innovation Solution
An integrated antenna device with a magnetic core and windings for LF operation, combined with an electrically insulated cap that houses a metallized HF coil, allowing for independent adjustment and replacement of the HF antenna, which provides protection and improves reliability across frequencies from 20 kHz to 150 kHz and 3-30 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate components are used for LF and HF antennas, then each antenna can be optimized for its specific frequency range, but the device complexity and physical space requirements increase
Solution Approach 1:
The patent combines LF and HF antenna functionalities into a single integrated antenna device. The LF antenna uses windings around a magnetic core, while the HF antenna uses a metallized surface on the cap, allowing both frequency ranges to coexist in one device without requiring separate components.
Solution Approach 2:
The antenna device is designed to perform multiple functions across different frequency ranges. The same device structure supports both LF operation (20-150 kHz) through the magnetic core windings and HF operation (3-30 MHz) through the metallized surface, making it a universal solution for keyless entry systems.
2Ease of manufacture
If a fixed HF antenna design is used, then manufacturing is simplified, but adaptability to different frequency ranges and performance optimization is limited
Solution Approach 1:
The antenna device is segmented into replaceable parts: a base structure with the LF antenna and a separate cap containing the HF antenna. This segmentation allows the HF cap to be independently replaced or modified to optimize for different frequency ranges without affecting the LF antenna or requiring complete device replacement.
Solution Approach 2:
The replaceable cap design introduces dynamic adaptability to the otherwise fixed manufacturing structure. Different caps can be manufactured for different HF frequency requirements and swapped as needed, providing flexibility while maintaining simple manufacturing processes for each individual component.
3Adaptability or versatility
If the HF antenna is integrated into a replaceable cap, then adaptability and performance optimization are improved, but device complexity increases
Solution Approach 1:
The HF antenna is nested within the cap structure, which itself is part of the larger antenna device. This nested arrangement allows the HF component to be independently accessed and replaced without disassembling the entire device, minimizing the practical complexity despite the modular design.
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
The solution enables a compact, reliable, and adaptable antenna device that efficiently operates across both LF and HF frequencies, enhancing performance and reducing component count, while the replaceable cap ensures optimal quality factor and sensitivity for each frequency band.
Implementation Method 1
one or more windings wound around said magnetic core providing a LF antenna adapted to work at a frequency comprised in a range between 20 and 150 kHz
Implementation Method 2
at least one metallized surface high frequency coil with two ends being arranged on said upper surface wherein the metallized surface high frequency coil works as an antenna and is electrically connected... to said metallic tabs
Data Source
AI summary
The antenna comprises a magnetic core (2), three windings (31, 32, 33) wound around the magnetic core (2) and an electrically insulated base (1) on which the magnetic core (2) wound with these windings (31,32,33) is arranged. The insulated base (1) includes metallic tabs (121 . . . 128) electrically connected to said windings (31, 32, 33) and the base (1) has a bottom surface with electrically conductive plates (131 . . . 138) with connection to the metallic tabs (121 . . . 128) and providing a layout for a SMT mounting, The antenna comprises an electrically insulated cap (4), having an upper surface (4U) including a metallized surface high frequency coil (42) working as a HF antenna and a side surface (4S), two ends (411, 412) of the coil (42) being arranged on the side surface (4S) for connection to the metallic tabs (121 . . . 128) of the electrically insulated base (1).