Miniature Multi-Purpose Antenna for Low-Power Magnetic Stripe Emulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current technologies lack a compact, low-power solution that integrates multiple functions such as remote wake-up, communication, reader detection, variable bit rate, variable power transmission, energy harvesting, and battery recharging within a single antenna for smart and mobile devices, particularly for supporting magnetic stripe and RF-based close-proximity communications.
Innovation Solution
A miniature, multi-purpose antenna system that includes a microprocessor or secure processing component connected to an antenna structure, capable of generating alternating magnetic fields and controlling various transmission parameters, allowing it to function as a multi-band antenna for close-proximity communications and energy transfer, while being compact enough to fit within ISO-standard devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple functions (remote wake-up, communication, energy harvesting, etc.) are integrated into a single antenna system, then device functionality and versatility are improved, but device complexity increases
Solution Approach 1:
The patent implements a single antenna structure that performs multiple functions including magnetic stripe emulation, RF communication, energy harvesting, and wake-up capabilities. The antenna is designed with a resonant frequency of 13.56 MHz and incorporates a core material with permeability between 100 and 1,000,000 to enable both magnetic field generation for magnetic stripe emulation and RF signal transmission, eliminating the need for separate antennas for each function
Solution Approach 2:
The patent combines previously separate components (magnetic stripe emulator coil, RF antenna, energy harvesting coil) into a single integrated antenna structure. This merging reduces the number of components, simplifies the bill of materials, and decreases overall device complexity while maintaining all required functionalities through careful electromagnetic design
2Volume of moving object
If antenna size is reduced to fit within ISO-standard devices, then device compactness is improved, but bandwidth and frequency support capability deteriorate
Solution Approach 1:
The patent uses a core material with adjustable permeability (between 100 and 1,000,000) to control the resonant frequency and electrical length of the antenna. By changing the core material parameters, the antenna can be tuned to 13.56 MHz while maintaining a compact size that fits within ISO-standard devices, and the same structure supports both magnetic stripe and RF frequency bands
Solution Approach 2:
The patent employs a multi-layer PCB structure with the antenna winding pattern distributed across multiple layers. This three-dimensional configuration allows the antenna to achieve the electrical length required for 13.56 MHz operation while maintaining a compact planar footprint that fits within ISO-standard device dimensions, effectively using the vertical dimension to resolve the size-frequency trade-off
3Use of energy by moving object
If power consumption is reduced for low-power operation, then energy efficiency is improved, but transmission power and signal strength deteriorate
Solution Approach 1:
The patent implements a duty-cycled operation mode where the antenna is activated only during brief transmission intervals for magnetic stripe emulation or wake-up events, rather than continuously. The microcontroller enters low-power sleep modes between activations, significantly reducing average power consumption while maintaining sufficient peak transmission power when needed for reliable communication
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
Enables efficient, low-power, and compact operation for multiple functions like data transfer, energy harvesting, and battery recharging across various frequency bands, supporting both magnetic stripe and RF-based communications in smart and mobile devices.
Implementation Method 1
capable of generating alternating magnetic fields
Implementation Method 2
energy harvesting, and battery recharging
Data Source
AI summary
A system for providing information to a magnetic card reader. The system comprises an antenna (in one embodiment comprising a multi-purpose antenna or an antenna module) and a microprocessor for applying a differential signal to the antenna. The differential signal represents data stored in a memory segment of the microprocessor or in a memory connected to the microprocessor. The antenna transmits an alternating magnetic field representing the information the alternating magnetic field is responsive to the differential signal and received by the magnetic card reader.