Resonant Loop Antenna for Magnetic Field Communication
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Solution Overview
Problem
Magnetic field communication systems face limitations due to narrow bandwidths, which restrict transmission distances, especially in near-field environments like underwater or underground settings, where signals are rapidly attenuated, and existing technologies struggle to extend communication ranges effectively.
Innovation Solution
The implementation of a resonant loop antenna configuration using multiple resonant coils with different resonant frequencies and adjustable overlap and isolation between them to broaden the bandwidth, allowing for increased transmission distances in magnetic field communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic induction technology without resonance is used, then bandwidth is secured easily, but transmission distance becomes very short
Solution Approach 1:
The patent applies resonance phenomenon to the antenna coil, causing it to vibrate at specific resonant frequencies. This resonance amplifies the magnetic field strength and extends the transmission distance while maintaining adequate bandwidth, resolving the contradiction between easy bandwidth securing and short transmission distance
Solution Approach 2:
The patent changes the operating parameters by tuning the antenna coil to resonate at specific frequencies (e.g., 125 kHz, 13.56 MHz). By adjusting resonant frequency parameters, the system achieves both sufficient bandwidth and extended transmission distance beyond what non-resonant magnetic induction can provide
2Length of stationary object
If loop coil of resonance structure is used, then transmission distance is extended, but narrow band limitation of small antenna occurs
Solution Approach 1:
The patent segments the bandwidth requirement into multiple resonant frequencies. By designing the antenna system to support multiple distinct resonant frequencies, the total operational bandwidth is divided into several narrow bands, each optimized for a specific frequency, collectively providing broad bandwidth coverage while maintaining resonance benefits
Solution Approach 2:
The patent makes the antenna system multi-functional by enabling it to operate at multiple resonant frequencies. This universality allows the same antenna structure to serve multiple frequency bands, overcoming the narrow band limitation while maintaining the transmission distance extension benefits of resonance
3Ease of operation
If signal transmission in near field is performed, then magnetic field communication is achieved, but signal is rapidly attenuated as transmission distance increases
Solution Approach 1:
The patent uses resonant vibration of the antenna coil to amplify the magnetic field signal strength. This resonance effect compensates for the rapid attenuation inherent in near-field magnetic field communication, enabling signals to maintain sufficient strength over extended transmission distances while preserving magnetic field communication capabilities
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 miniaturizes the resonant loop antenna, solves narrowband issues, and secures a broadband, thereby extending transmission distances in near-field magnetic field communication environments, enhancing the overall performance of magnetic field communication systems.
Implementation Method 1
a first coil and a first capacitor form a first resonator, the second coil and the second capacitor form a second resonator, the third coil and the third capacitor form a third resonator, the first to third coils are disposed to overlap each other
Implementation Method 2
an antenna coil may have a non-resonant structure using a magnetic induction technology without using a resonance phenomenon
Implementation Method 3
a first coil and a first capacitor form a first resonator, the second coil and the second capacitor form a second resonator, the third coil and the third capacitor form a third resonator, the first to third coils are disposed to overlap each other, and isolation between the first to third resonators is determined according to a degree of overlaps between the first to third coils
Data Source
AI summary
An antenna device for magnetic field communication may include: a first coil; a second coil; a third coil; a first capacitor connected to a 1-1 terminal of the first coil; a second capacitor connected to a 2-1 terminal of the second coil; a third capacitor connected to a 3-1 terminal of the third coil; and an input port including a first input terminal connected to a 1-2 terminal of the first coil, a 2-2 terminal of the second coil, and a 3-2 terminal of the third coil, and a second input terminal connected to the first capacitor, the second capacitor, and the third capacitor.