Loop Antenna Design for Efficient Impedance Matching
Here’s PatSnap Eureka !
Summary
Problems
Existing loop antennas face impedance mismatch issues when connected to high-frequency circuits with a 50Ω characteristic impedance, requiring an impedance conversion unit to achieve satisfactory characteristics, which increases complexity and size.
Innovation solutions
A loop antenna design featuring a loop element on one surface of a dielectric substrate with a parasitic element on the opposite surface, arranged in a concentric relationship with an opening portion smaller than half the perimeter of the loop element, positioned opposite to the feeding point, allowing direct connection to a 50Ω circuit without the need for an impedance conversion unit.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a loop antenna with basic shape is used, then the input impedance is 75Ω, but impedance mismatch occurs when connected to 50Ω high-frequency circuit
Why choose this principle:
A parasitic element is introduced as an intermediary component between the loop element and the feeding circuit. This parasitic element, when electrically connected to the loop element, transforms the overall input impedance of the antenna system from 75Ω to 50Ω, enabling direct connection to standard 50Ω high-frequency circuits without requiring a separate impedance conversion unit.
Principle concept:
If a loop antenna with basic shape is used, then the input impedance is 75Ω, but impedance mismatch occurs when connected to 50Ω high-frequency circuit
Why choose this principle:
The input impedance parameter of the antenna system is changed from 75Ω to 50Ω by adding the parasitic element. This parameter transformation is achieved through the electromagnetic interaction between the loop element and the parasitic element, allowing the antenna to be directly matched to 50Ω circuits.
Application Domain
Data Source
AI summary:
A loop antenna design featuring a loop element on one surface of a dielectric substrate with a parasitic element on the opposite surface, arranged in a concentric relationship with an opening portion smaller than half the perimeter of the loop element, positioned opposite to the feeding point, allowing direct connection to a 50Ω circuit without the need for an impedance conversion unit.
Abstract
A loop antenna includes a parasitic element arranged at a position almost concentric to a loop element and having an opening portion smaller than the half perimeter of the loop element at a position opposite to the feeding point of the loop element.