Adjustable Coupling Circuit for Antenna Design Flexibility
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Solution Overview
Problem
Conventional multiple resonant antennas have limited design flexibility due to fixed coupling between radiating elements, which affects their frequency matching and performance, especially when other metal components are nearby.
Innovation Solution
A coupling degree adjustment circuit using coil elements electromagnetically coupled between radiating elements allows for adjustable coupling, enabling flexible pattern design and improved frequency matching without requiring elements to be parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the first radiating element and the second radiating element are arranged close to each other and in parallel to achieve magnetic coupling, then the coupling strength between elements is improved, but the design flexibility of element patterns is reduced and matching becomes difficult when other metal components are nearby
Solution Approach 1:
A coupling element with coil structures is introduced as an intermediary between the first and second radiating elements. The coupling element includes a first coil portion coupled to the first radiating element and a second coil portion coupled to the second radiating element, enabling magnetic coupling without requiring the radiating elements to be in direct parallel proximity. This mediator approach resolves the contradiction by providing coupling strength through the intermediary coils while maintaining design flexibility of the radiating element patterns.
Solution Approach 2:
The invention changes the coupling mechanism from direct spatial proximity to electromagnetic coupling through coil structures. By adjusting parameters such as the number of coil turns, coil dimensions, and magnetic core properties, the coupling strength can be controlled independently of the radiating element arrangement. This allows the radiating elements to be positioned flexibly while maintaining required coupling strength through parameter optimization of the coil structures.
2Strength
If the first radiating element and the second radiating element are arranged close to each other to achieve magnetic coupling, then the coupling strength is improved, but the difficulty of matching feeding circuit and antenna increases
Solution Approach 1:
The coupling element with adjustable coil structures serves as a mediator that provides a controllable coupling interface between the radiating elements and feeding circuit. The coil parameters (turns, dimensions, core material) can be optimized to achieve impedance matching and desired coupling strength, simplifying the overall matching process compared to direct parallel arrangement where coupling strength is fixed by geometry.
3Strength
If the first radiating element and the second radiating element are arranged in parallel to achieve magnetic coupling, then the coupling strength is improved, but the problem that coupling degree changes when other metal components are nearby arises
Solution Approach 1:
The coupling element with coil structures and magnetic cores acts as a shielded intermediary that provides a controlled magnetic coupling path. This isolated magnetic circuit reduces sensitivity to external metal components compared to direct parallel arrangement, where metal objects can easily disrupt the magnetic field. The coupling stability is improved by confining the magnetic flux within the coil structures and magnetic cores.
Solution Approach 2:
By using magnetic core materials with high permeability in the coupling element, the magnetic coupling strength can be enhanced and stabilized against external interference. The parameter optimization of coil structures and magnetic cores creates a robust coupling mechanism that maintains stable coupling degree even when other metal components are present in the vicinity.
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 solution enhances design flexibility and ensures effective frequency matching by allowing the degree of coupling between radiating elements to be set independently, reducing losses and improving high-frequency energy transmission.
Implementation Method 1
a secondary side circuit including a second coil element that is electromagnetically coupled to the first coil element, and is connected to a second radiating element
Data Source
AI summary
A dielectric body includes a first radiating element on a first side and a second radiating element on a second side. The first radiating element and the second radiating element are linear conductors that each extend from a first end to a second end (an open end), and are parallel or substantially parallel to each other in a direction from the first end to the second end. The first end of the first radiating element is connected to a first port of a coupling degree adjustment circuit, and the first end of the second radiating element is connected to a second port of the coupling degree adjustment circuit. The first radiating element and the second radiating element are mainly coupled to each other in the coupling degree adjustment circuit.