Loop Antenna with Amplifying Closed Loop for Low Power Area Expansion
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Solution Overview
Problem
Existing radio systems using magnetic fields for area expansion face significant power consumption increases when trying to expand the authentication area, as they require higher currents to maintain a larger magnetic field distribution.
Innovation Solution
A loop antenna design featuring a main open loop and an amplifying closed loop, both wound on a magnetic or insulation bar-shaped rod, with resistors and capacitors in series, where the amplifying loop has a lower resistance and higher current accumulation, enhancing magnetic field generation and reception without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the current supplied from the transmitter is increased to expand the radio area, then the radio area can be widely expanded, but the power consumption increases significantly
Solution Approach 1:
A resonant circuit is introduced as an intermediary component between the transmitter and the magnetic field generation. The resonant circuit amplifies the magnetic field through resonance effects, allowing the radio area to be expanded without proportionally increasing the transmitter current, thus reducing power consumption
Solution Approach 2:
The invention changes the operating parameters by utilizing resonant frequency matching between the transmitter loop antenna and the receiver loop antenna. By operating at the resonant frequency, the system achieves maximum magnetic field coupling and area expansion with minimum power input
2Shape
If a loop antenna is used to form authentication area with magnetic field, then spherical magnetic field distribution is formed, but the distance attenuation property is precipitous
Solution Approach 1:
The invention utilizes electromagnetic resonance (analogous to mechanical vibration) in the loop antennas to create a resonant magnetic field that extends further in distance. By tuning the loop antennas to resonate at the same frequency, the magnetic field attenuation with distance is reduced, allowing the authentication area to extend further while maintaining the spherical distribution shape
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 greater magnetic field generation and reception, effectively expanding the radio system's area of operation while maintaining low power consumption by amplifying currents through mutual inductance and optimized resistor and capacitor values.
Implementation Method 1
an amplifying loop that is a closed loop having a same shape as the main loop... a current that is sufficiently greater than a current flowing through the main loop can be accumulated in the amplifying loop; as a result, it is possible to generate a great magnetic field
Implementation Method 2
in a case of using the receiving circuit, due to an effect that a great current is accumulated in the amplifying loop when receiving the magnetic field, the main loop can receive a receiving current that is greater than that in a case of using no amplifying loop
Data Source
Figure 1~2
Figure 3~4
AI summary
A main loop 1 is an open loop that is wound on a bar-shaped rod 3 formed of a magnetic body or an insulation body and that has terminals T and T that couple a signal source 5 or a (not illustrated) receiving circuit to the main loop 1. The number of turns is 1 or more, for example, 5. Fig. 1 is a diagram in which the signal source 5 is coupled as an example. An amplifying loop 2 is wound on a part of the rod 3 that is different from the part on which the main loop 1 is wound. The main loop 1 and the amplifying loop 2 are thus spaced from each other. The amplifying loop 2 is a closed loop including no terminals. The number of turns is 1 or more, for example, 5. The number of turns may be the same as or different from the number of turns of the main loop 1.