Multiband Antenna Slit Configuration for Radiation Efficiency
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Solution Overview
Problem
Conventional multiband antennas face challenges in achieving high radiation efficiency and miniaturization while maintaining compatibility across multiple frequency bands, often resulting in narrow resonance bandwidths.
Innovation Solution
A multiband compatible antenna design featuring a planar conductor with a slit configuration, including a first slit portion and a second slit portion intersecting at an angle, positioned closer to one edge, which allows for resonance at multiple frequencies and miniaturization, enhancing radiation efficiency across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional multiband antenna designs are used, then multiband compatibility is achieved, but radiation efficiency is reduced and resonance bandwidth is narrowed
Solution Approach 1:
The planar conductor is divided into multiple element portions (first element portion and second element portion) separated by slits. Each element portion resonates at a different frequency (first frequency and second frequency), enabling multiband operation while maintaining high radiation efficiency through proper current distribution paths.
Solution Approach 2:
Different regions of the planar conductor are designed with different properties: the first element portion is optimized for first frequency resonance, while the second element portion is optimized for second frequency resonance. The slits are strategically positioned to control current flow and enhance radiation efficiency at each frequency band.
2Volume of moving object
If antenna size is reduced for miniaturization, then device compactness is improved, but radiation efficiency deteriorates
Solution Approach 1:
The antenna transitions from traditional three-dimensional structures to a planar two-dimensional configuration. The planar conductor with strategically placed slits enables miniaturization while maintaining effective current paths for radiation, achieving high radiation efficiency in a compact form factor.
Solution Approach 2:
Multiple resonant elements are nested within a single planar conductor structure. The first element portion and second element portion are integrated into one planar geometry with slits, allowing multiband functionality and miniaturization without compromising radiation efficiency.
3Ease of manufacture
If simple antenna configuration is used, then manufacturing ease is improved, but multiband performance with high radiation efficiency cannot be achieved
Solution Approach 1:
The antenna uses a planar conductor (thin film structure) that can be easily manufactured using standard PCB or thin-film fabrication techniques. The slit patterns are directly formed in the planar conductor, providing a simple yet effective configuration for achieving high radiation efficiency across multiple 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
The antenna achieves high radiation efficiency and miniaturization, widening the resonance frequency band to include both the first and second frequencies, thereby improving performance across multiple frequency bands.
Implementation Method 1
a multiband compatible antenna that resonates at a first frequency and a second frequency higher than the first frequency, and includes: a planar conductor including a feeding portion to which a signal is supplied, a grounding portion which is grounded, and a slit disposed between the feeding portion and the grounding portion
Data Source
AI summary
A multiband compatible antenna that resonates at a first frequency and a second frequency includes: a planar conductor including a feeding portion to which a signal is supplied, a grounding portion, and a slit between the feeding portion and grounding portion. The slit includes a first slit portion extending in a first direction and a second slit portion extending in a second direction intersecting the first direction from an end of the first slit portion. The first slit portion is disposed closer to one edge than a center of the planar conductor in the second direction, and the feeding portion is disposed to a side of the first slit portion closer to the one edge. The planar conductor includes a first element portion and a second frequency portion that resonate at the first frequency and the second frequency, respectively. The second slit portion is disposed in the first element portion.