Antenna Feeding Structure with Adjustable Reactance Loops
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Solution Overview
Problem
Existing antenna designs face performance degradation at high frequencies due to reduced magnetic flux in feeding loops, leading to narrower bandwidth and sensitivity to standardized capacitance values, making it difficult to achieve optimal resonance at desired frequencies.
Innovation Solution
The antenna apparatus incorporates a feeding structure with multiple loops and reactance devices connected in series or parallel, allowing for adjustable reactance values to control resonance frequency and provide broadband characteristics, enabling efficient signal feeding across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standardized capacitance values are used in antenna design, then manufacturing is simplified, but resonance frequency control precision is reduced
Solution Approach 1:
The patent changes the reactance parameter from fixed standardized capacitance values to variable inductive reactance achieved through multiple adjustable loop structures. By varying the number of loops, their areas, and their configurations, the equivalent inductance can be continuously adjusted to achieve precise resonance frequency control without being constrained by standardized capacitance values.
Solution Approach 2:
The patent replaces the traditional capacitive reactance adjustment mechanism with an inductive reactance adjustment mechanism using multiple loops. Instead of selecting from standardized capacitance values, the equivalent inductance is adjusted by changing the physical configuration (number of turns, loop areas) of the feeding structure, providing continuous and precise control.
2Reliability
If multiple loops with different areas are used to increase magnetic flux, then broadband performance is improved, but device complexity increases
Solution Approach 1:
Multiple feeding loops with different areas are merged into a single integrated feeding structure that simultaneously provides magnetic coupling across multiple frequency bands. The loops are combined in such a way that their individual magnetic flux contributions add up to provide broadband feeding, reducing the need for separate feeding structures for 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 enhances broadband performance and allows for precise control of resonance frequency, enabling antennas to operate effectively across a desired band with non-standardized reactance values, improving efficiency and flexibility in design.
Implementation Method 1
When an RF current provided from the feeding part 21 flows through the feeding loop 25, there is generated an equivalent magnetic current Im. The equivalent magnetic current Im may be considered as a magnetic flux generated in the feeding loop 25
Implementation Method 2
it is possible to derive a reactance device value needed in a resonance by combining optimal reactance devices via performing one of 1) connecting a plurality of reactance devices in series, 2) connecting circuits including one or more reactance devices in parallel
Data Source
AI summary
Embodiments provide connecting various circuits to which capacitive elements are connected to obtain an optimal capacitive reactance value needed in a resonance. Embodiments provide a capacitance value of an optimal capacitive reactance needed in a resonance by connecting a plurality of capacitive elements to a conductive line connecting an emitter and a ground in series or connecting one or more capacitive elements in parallel/series.