Loop Antenna Design for Magnetic Field Area Expansion
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Solution Overview
Problem
The steep distance attenuation characteristic of magnetic fields, which is more pronounced than that of radio waves, poses a challenge in increasing the area of a radio system using magnetic fields, requiring increased current supply to achieve larger coverage.
Innovation Solution
A loop antenna design featuring a main open loop connected to a signal source and an amplification closed loop of the same shape, arranged on the same or different surfaces of insulating substrates, which enhances the magnetic field generation by accumulating current in the amplification loop, thereby increasing the area of the radio system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If current supplied from transmitter is increased to increase radio area, then coverage area is improved, but energy consumption and system complexity increase
Solution Approach 1:
The patent introduces a resonant circuit as an intermediary component between the transmitter and the receiving area. This resonant circuit amplifies the magnetic field through resonance effects, allowing the same transmitter current to produce a larger effective radio area without proportionally increasing energy consumption.
Solution Approach 2:
The patent changes the operating parameters by tuning the resonant frequency of the circuit components (inductors and capacitors) to match the transmitter frequency. This parameter adjustment creates resonant conditions that amplify the magnetic field strength and extend the radio area without requiring proportional increases in transmitter current.
2Force
If current supplied from transmitter is increased to overcome steep distance attenuation, then magnetic field strength is improved, but energy consumption increases
Solution Approach 1:
The patent employs periodic oscillating currents at resonant frequencies to generate the magnetic field. The resonant circuit stores and releases energy periodically, creating sustained oscillations that maintain strong magnetic field strength over distance without requiring continuously high current supply from the transmitter.
Solution Approach 2:
By adjusting the resonant frequency and Q-factor of the circuit components, the patent optimizes the magnetic field strength at the desired operating frequency. This allows the system to achieve strong magnetic fields at specific frequencies without proportionally increasing the overall energy consumption.
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 design allows for a significantly larger magnetic field generation and reception current, effectively expanding the area of the radio system without increasing the current supply from the transmitter, thus overcoming the limitations of steep distance attenuation.
Implementation Method 1
an amplification loop which is a closed loop having a same shape as the main loop, and the main loop and the amplification loop are arranged on a same surface of a flat substrate formed of an insulator
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4(a)~4(b)
AI summary
Provided is a loop antenna which can contribute to an increase of an area of a radio system using a magnetic field. The loop antenna includes a main loop 1 which is an open loop connected to a signal source 5 or a reception circuit; and an amplification loop 2 which is a closed loop having the same shape as the main loop 1. The main loop 1 and the amplification loop 2 are arranged on a same surface of a flat substrate formed of an insulator. A first capacitance is connected to the main loop 1, and a second capacitance is connected to the amplification loop.