Modified Loop Antenna for Enhanced Radiation Efficiency
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Summary
Problems
Existing loop antennas are inefficient for both transmission and reception due to low radiation efficiency and are typically limited to near-field applications, with small loop antennas being particularly unsuitable for transmit purposes and offering reduced energy transfer due to their size and ability to produce only magnetic fields.
Innovation solutions
A modified loop antenna design incorporating a series resonant circuit positioned to create a 90-degree phase difference between electric and magnetic fields, allowing for orthogonal field propagation and enabling the antenna to function effectively in both transmit and receive modes, with the series resonant circuit acting as an E-field radiator and receiver.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a small loop antenna is used to reduce device size, then the device form factor is improved, but the radiation efficiency deteriorates
Why choose this principle:
The loop antenna is divided into multiple discrete segments or elements rather than being a continuous loop. This segmentation allows each element to be optimized for current distribution and impedance matching, improving radiation efficiency while maintaining a compact overall structure suitable for mobile devices.
Principle concept:
If a small loop antenna is used to reduce device size, then the device form factor is improved, but the radiation efficiency deteriorates
Why choose this principle:
The antenna design employs variable geometric parameters including non-uniform spacing between loop elements, adjustable element lengths, and optimized curvature radii. These parameter variations enable impedance matching and enhance current distribution patterns, thereby improving radiation efficiency without increasing the overall antenna footprint.
Application Domain
Data Source
AI summary:
A modified loop antenna design incorporating a series resonant circuit positioned to create a 90-degree phase difference between electric and magnetic fields, allowing for orthogonal field propagation and enabling the antenna to function effectively in both transmit and receive modes, with the series resonant circuit acting as an E-field radiator and receiver.
Abstract
Disclosed is an antenna comprising a loop element ( 10 ) and an Electric-field radiator ( 30 ), wherein the E-field radiator is electrically coupled to the loop element such that at the frequency of operation, there is a substantially 90 degree phase difference between the Electric and Magnetic fields produced by the antenna.