Multi-Loop Antenna Circuit for Wider Magnetic Communication Bandwidth
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Solution Overview
Problem
Magnetic field communication systems face limitations in providing various wireless services due to the narrow frequency bandwidth of loop antennas and the need to minimize radio frequency components for miniaturization.
Innovation Solution
A resonant multi-loop antenna circuit is designed with multiple loop antennas arranged on the same plane and matching circuits connected in series, minimizing reactance and mutual inductance to expand communication bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single loop antenna is used for magnetic field communication, then the system structure is simple, but the frequency bandwidth is narrow
Solution Approach 1:
The patent divides a single antenna system into multiple loop antennas (first loop antenna and second loop antenna) operating at different carrier frequencies. Each loop antenna is equipped with its own matching circuit, creating segmented frequency bands that collectively expand the overall communication bandwidth while maintaining manageable system complexity through modular design.
Solution Approach 2:
The multiple loop antennas are designed to operate at different carrier frequencies simultaneously, enabling the antenna system to perform multiple communication functions across different frequency bands. This multi-functionality allows the system to support various wireless services with different frequency requirements within a single integrated antenna structure.
2Adaptability or versatility
If multiple loop antennas are used to expand bandwidth, then the communication bandwidth increases, but the reactance and mutual inductance between antennas increase
Solution Approach 1:
The patent applies different matching circuit configurations to different loop antennas based on their specific carrier frequencies. The first matching circuit is optimized for the first carrier frequency while the second matching circuit is optimized for the second carrier frequency, allowing each antenna to operate with minimized reactance at its designated frequency while reducing overall system interference.
3Speed
If the carrier frequency is lowered to extend wireless service distance, then the communication distance increases, but the frequency bandwidth becomes narrower
Solution Approach 1:
Instead of using a single very low frequency for long-distance communication, the patent segments the frequency spectrum into multiple carrier frequencies (first carrier frequency and second carrier frequency). This segmentation allows the system to maintain lower frequencies for extended distance while collectively providing broader bandwidth across all frequency segments, supporting both long-distance requirement and various wireless services.
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 increases magnetic field communication efficiency and expands bandwidth, enabling long-distance communication without interference, while maintaining a compact system size.
Implementation Method 1
The first matching circuit may be configured to minimize reactance of the first loop antenna and the first matching circuit connected in series to each other at a first carrier frequency, the second matching circuit may be configured to minimize the reactance of the second loop antenna and the second matching circuit connected in series to each other at a second carrier frequency
Implementation Method 2
magnetic field communication is less affected by the transmission medium, so unlike radio wave communication, stable communication is possible inside a building, subway, or underwater
Data Source
AI summary
Provided is a resonant multi-loop antenna circuit for magnetic field communication. The resonant multi-loop antenna circuit includes a first loop antenna and a second loop antenna arranged substantially on a same plane, and a first/a second matching circuit connected in series to the first and the second loop antenna respectively. The first matching circuit may be configured to minimize reactance of the first loop antenna and the first matching circuit connected in series to each other at a first carrier frequency, the second matching circuit may be configured to minimize the reactance of the second loop antenna and the second matching circuit connected in series to each other at a second carrier frequency, and the first loop antenna and the second loop antenna may be arranged so that a center of the first loop antenna is spaced apart from a center of the second loop antenna by a predetermined distance.