Antenna Case Split-Ring Resonator for Low-Height Radiation
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Solution Overview
Problem
Existing antenna devices face a challenge in achieving a balance between maintaining strength and design flexibility while reducing the height of the case to accommodate antenna elements, as increasing the height compromises flexibility, and reducing the height compromises strength.
Innovation Solution
The antenna device incorporates a case with a split ring resonator opening that functions as an LC resonator, comprising main openings and a coupling opening, allowing for resonance at specific frequencies without altering the case height, thereby enabling a reduced height design while maintaining strength and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the case height is increased to accommodate a high opening for the slot, then the radio wave radiation function is improved, but the design flexibility is worsened
Solution Approach 1:
The opening is segmented into two separate openings (first opening and second opening) positioned apart from each other, connected by a coupling portion. This segmentation allows each opening to be optimized for its specific function while maintaining overall structural integrity, resolving the contradiction between radiation function and design flexibility.
Solution Approach 2:
The opening structure extends in the width direction rather than requiring increased height. By arranging the two openings apart in the width direction and connecting them horizontally, the design achieves the necessary opening dimensions without compromising design flexibility in the height direction.
2Reliability
If the case height is increased to form a high opening, then the slot resonance function is improved, but the case strength is lowered
Solution Approach 1:
Dividing the opening into two separate openings connected by a coupling portion allows the resonance function to be distributed across multiple structural elements. This segmentation maintains the necessary opening area for resonance while preserving more material in the case structure, thereby maintaining strength.
Solution Approach 2:
The opening structure is reconfigured to extend horizontally in the width direction rather than vertically in the height direction. This dimensional change allows the slot to achieve its resonant length without increasing case height, thus maintaining case strength while preserving resonance function.
3Strength
If the opening height is reduced to maintain case strength, then the case strength is improved, but the radio wave radiation efficiency is lowered
Solution Approach 1:
The opening is divided into two openings with a coupling portion, creating a distributed resonant structure. This segmentation allows the total opening area and resonant path length to be maintained even when individual opening heights are reduced, preserving radiation efficiency while allowing reduced case height for strength.
Solution Approach 2:
The opening structure transitions from a vertical configuration to a horizontal configuration in the width direction. This dimensional change allows the resonant length to be achieved through horizontal extension rather than vertical height, maintaining radiation efficiency while enabling reduced case height for improved strength.
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 allows the antenna device to resonate with various frequencies by adjusting the shapes and sizes of the openings, ensuring effective radio wave radiation with a predetermined frequency, even at a reduced case height, thus balancing strength and design flexibility.
Implementation Method 1
The predetermined opening forms a split ring resonator which resonates at the predetermined frequency
Implementation Method 2
The predetermined opening works as an LC resonator which has an inductance component mainly formed of the main openings and a capacitance component mainly formed of the coupling opening
Data Source
AI summary
An antenna device comprises a case and an antenna element. The antenna element is arranged in the case and radiates a radio wave with a predetermined frequency which has a plane of polarization in parallel to a predetermined plane. The case is formed with a predetermined opening. The predetermined opening has two main openings and a coupling opening. The two main openings are apart from each other in a first direction perpendicular to the predetermined plane. The coupling opening couples the two main openings together in the first direction. The coupling opening has a size smaller than another size of each of the two main openings in a second direction perpendicular to the first direction. The predetermined opening forms a split ring resonator which resonates at the predetermined frequency and radiates a radio wave corresponding to the radio wave radiated from the antenna element.