Sierpinski Antenna Assembly With Capacitive Cell Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Sierpinski antennas have insufficient impedance bandwidths for applications in communication and radar systems, limiting their effectiveness in these frequency bands.
Innovation Solution
The antenna assembly incorporates unit cells with dielectric boards and metallic dipole arms, connected by capacitive coupling devices with spaced conductive segments, which capacitively couple neighboring cells to increase impedance bandwidth and maintain a designated separation gap, along with dielectric standoff devices for mounting to a ground plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional Sierpinski antenna designs are used, then the antenna achieves compact design with fractal patterns, but the impedance bandwidth is insufficient for communication and radar systems
Solution Approach 1:
The antenna is divided into multiple unit cells arranged in a grid pattern, where each unit cell contains fractal dipole arms. This segmentation allows the antenna to maintain compact size while achieving wider bandwidth through the collective contribution of multiple cells with different resonant frequencies
Solution Approach 2:
The fractal dipole arms are constructed using nested triangular patterns where smaller triangles are embedded within larger ones. This nesting creates multiple resonant frequencies within a compact structure, enabling the antenna to operate across wide impedance bandwidth while maintaining a small footprint
2Area of stationary object
If unit cells are placed close together to reduce size, then the antenna assembly becomes more compact, but coupling between adjacent cells causes performance degradation
Solution Approach 1:
Dielectric standoff devices are introduced as intermediary elements between adjacent unit cells. These standoffs maintain precise separation distances that prevent harmful electromagnetic coupling while allowing the antenna assembly to remain compact. The dielectric material provides both mechanical support and electrical isolation
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 solution achieves a 2:1 to 5:1 impedance bandwidth enhancement, enabling ultra-wideband communication and scanning without mechanical parts, suitable for vehicles and systems like communication and radar.
Implementation Method 1
The coupling devices can connect the unit cells in the neighboring pairs with the conductive segments contacting the unit cells to capacitively couple the unit cells with each other
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An antenna assembly can include unit cells having dipole arms for communication of radio frequency (RF) signals. The unit cells include first dielectric boards with metallic layers on the dielectric boards forming the dipole arms. The antenna assembly also can include coupling devices connecting neighboring pairs of the unit cells. The coupling devices can have second dielectric boards with conductive segments spaced apart from each other. Each of the coupling devices can be connected with and extending between the unit cells in each of the neighboring pairs of the unit cells with each of the conductive segments of each of the coupling devices contacting the first dielectric boards in the unit cells in each of the neighboring pairs.