Bottleneck Microstrip Array Antenna for Cross-Polarization Control
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Solution Overview
Problem
Conventional microstrip patch array antennas face challenges in designing high-gain antennas due to significant cross-polarized conductance caused by transverse direction currents, which complicates the design and degrades the accuracy of beam formation.
Innovation Solution
Employing bottleneck-shaped radiation elements to cancel transverse direction current components, thereby enhancing design accuracy and improving the co-polarized conductance, using a microstrip array antenna with a dielectric substrate, feed line, and ground surface, and incorporating features like microstrip stubs and matching circuits for impedance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional wide rectangular radiation elements are used, then the antenna structure is simple, but cross-polarized conductance increases and design accuracy deteriorates
Solution Approach 1:
The patent applies asymmetry by using a bottleneck-shaped radiation element instead of a conventional wide rectangular shape. The bottleneck shape features a narrow central section connecting two wider regions, creating an asymmetric current distribution that cancels transverse direction current components. This asymmetric geometry eliminates cross-polarized conductance while maintaining manufacturing feasibility through standard PCB fabrication processes.
2Device complexity
If conventional wide rectangular radiation elements are used, then the design process is straightforward, but cross-polarized conductance degrades beam accuracy
Solution Approach 1:
The bottleneck shape introduces controlled asymmetry in the radiation element geometry, creating specific current distribution patterns that eliminate cross-polarized conductance. This asymmetric design improves beam accuracy by ensuring that only the desired polarization component is radiated, while the transverse current components that would degrade beam accuracy are canceled out through the geometric configuration.
3Manufacturing precision
If bottleneck-shaped radiation elements are used, then cross-polarized conductance is eliminated, but the radiation element geometry becomes more complex
Solution Approach 1:
The bottleneck-shaped radiation element can be viewed as a segmented structure with three distinct regions: two wider end sections and a narrow central section. This segmentation allows the element to be designed using standard PCB trace routing techniques, where the bottleneck shape is created by adjusting trace width along the length of the element. The segmentation approach maintains manufacturing simplicity while achieving the desired geometric complexity for eliminating cross-polarized conductance.
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 bottleneck-shaped radiation elements effectively eliminate cross-polarized conductance, allowing for precise antenna design and achieving high gain with improved side lobe levels and beam accuracy, as demonstrated by simulation and measurement results.
Implementation Method 1
bottleneck-shaped radiation elements to cancel transverse direction current components, thereby enhancing design accuracy and improving the co-polarized conductance
Data Source
AI summary
Provided is a microstrip array antenna including a dielectric substrate, a feed line formed on a top surface of the dielectric substrate, a plurality of radiation elements formed on the top surface of the dielectric substrate and electrically connected to the feed line, and a ground surface formed on a bottom surface of the dielectric substrate. At least one radiation element among the plurality of radiation elements may have a bottleneck shape.