GPS Patch and RFID Loop Antenna Magnetic Coupling
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Solution Overview
Problem
Conventional GPS antennas in portable devices experience performance degradation due to interference with RFID/NFC antennas, limiting miniaturization and effective operation when placed in close proximity.
Innovation Solution
A configuration featuring a patch antenna with a resonant frequency for GPS and a loop antenna with a different resonant frequency for RFID, where the loop antenna is designed to generate standing waves and magnetically couple with the patch antenna, allowing for closer placement and enhanced directional performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the GPS antenna and RFID antenna are placed in close proximity to enable miniaturization, then the device size is reduced, but antenna performance degrades due to interference between the antennas
Solution Approach 1:
The loop antenna is designed with specific local characteristics: its loop length is set to generate standing waves at the GPS frequency, and its orientation is optimized to create magnetic coupling with the patch antenna. This localized optimization of the loop antenna's electromagnetic properties allows it to improve GPS signal reception in the vicinity of the patch antenna without requiring large separation distances, thereby resolving the contradiction between miniaturization and antenna performance.
2Reliability
If the antennas are separated by approximately λ/4 to ensure performance without interference, then antenna performance is maintained, but the device cannot be miniaturized
Solution Approach 1:
The invention utilizes magnetic coupling in the near-field magnetic induction region, which operates on a different electromagnetic interaction mechanism than traditional far-field radiation. By configuring the loop antenna to couple magnetically with the patch antenna at GPS frequencies, the system achieves effective antenna performance without requiring the conventional λ/4 separation distance, thus enabling device miniaturization while maintaining reliability.
3Reliability
If the loop antenna is designed to generate standing waves at the GPS frequency, then magnetic coupling with the patch antenna is enhanced, but the loop antenna's resonant frequency for RFID must be different from the GPS frequency
Solution Approach 1:
The antenna system is segmented into two distinct functional components: the patch antenna dedicated to GPS reception and the loop antenna serving dual purposes for RFID operation and GPS signal enhancement. The loop antenna's length is specifically designed to create standing waves at GPS frequency to improve coupling, while its resonant frequency for RFID remains different. This segmentation of functions allows each antenna to operate optimally at its designated frequency without interference, managing the complexity through clear functional separation.
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 antenna performance by increasing directionality and enabling the antennas to operate effectively in multiple directions without interference, facilitating miniaturization and improved radio wave propagation.
Implementation Method 1
a loop length of the loop antenna is such that standing waves are generated in the loop antenna when the loop antenna receives radio waves of the first frequency
Implementation Method 2
the patch antenna is disposed so as to magnetically couple with the loop antenna
Data Source
AI summary
An antenna device of the present invention includes, in one aspect: a patch antenna having a resonant frequency at a first frequency; and a loop antenna having a resonant frequency at a second frequency that is different from the first frequency. A loop length of the loop antenna is such that standing waves are generated in the loop antenna when the loop antenna receives radio waves of the first frequency, and the patch antenna is disposed so as to magnetically couple with the loop antenna.