Magnetically Coupled Inductance Antenna Circuit for Wideband Matching
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Solution Overview
Problem
Existing antenna circuits experience changes in matching states when resonant frequency is switched, leading to narrow-band characteristics and inadequate frequency band width, particularly when transitioning between different frequency bands.
Innovation Solution
The antenna circuit incorporates a matching circuit with a first inductance element connected in shunt and a frequency-characteristics adjusting circuit with a second inductance element, where both elements are magnetically coupled, allowing the effective reactance of the first inductance element to change with varying reactance, thereby maintaining a necessary frequency band width even as the resonant frequency varies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable reactance circuit is connected in shunt with the frequency-characteristics adjustment port to switch resonant frequency, then the resonant frequency can be changed, but the matching state changes and the band width becomes narrow
Solution Approach 1:
A magnetic coupling element is introduced as an intermediary between the variable reactance circuit and the matching circuit. This mediator transfers the frequency-switching function while isolating the matching state from direct interference, allowing resonant frequency to change without causing matching degradation
Solution Approach 2:
The circuit is segmented into functionally independent modules: the variable reactance circuit for frequency switching, the magnetic coupling element for isolated energy transfer, and the matching circuit for maintaining stable matching. This segmentation allows each module to perform its function without interfering with others
2Adaptability or versatility
If the reactance of the frequency-characteristics adjusting circuit is switched to change resonant frequency, then frequency characteristics can be adjusted, but the band width varies and narrow-band characteristics occur
Solution Approach 1:
The magnetic coupling element acts as a mediator that decouples the frequency-switching operation from the matching operation, allowing the resonant frequency to be adjusted while the matching circuit maintains its optimal matching state independently, thus preserving wide band width
Solution Approach 2:
The system dynamically adjusts the resonant frequency through the variable reactance circuit while the matching circuit maintains dynamic adaptation through magnetic coupling, ensuring that the matching state automatically adjusts to maintain wide bandwidth across different frequency bands
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 configuration ensures consistent wide-band matching characteristics across different resonant frequencies, maintaining performance across various frequency bands without requiring a variable reactance element, thus enabling reliable communication over a wide range.
Implementation Method 1
The first inductance element and the second inductance element are magnetically coupled to each other
Data Source
AI summary
An antenna circuit includes a radiation conductor, a matching circuit disposed between a feeding port in the radiation conductor and a feeder circuit, and a frequency-characteristics adjusting circuit connected between a frequency-characteristics adjustment port in the radiation conductor and a ground and including a variable reactance circuit. The matching circuit includes a first inductance element connected in shunt. The frequency-characteristics adjusting circuit includes a second inductance element. The first inductance element and the second inductance element are magnetically coupled to each other.