Folded MIMO Antenna Layout for Low-Profile Element Isolation
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Solution Overview
Problem
Existing MIMO antenna arrangements for vehicles face challenges in achieving a low profile without compromising broadband characteristics, especially for applications requiring multiple antenna elements that operate in multiple bands and provide sufficient isolation.
Innovation Solution
A baseplate with folded monopole antenna elements arranged in a windmill-like configuration, featuring a baseplate with stiffening elements and a radome, houses multiple antenna elements that are spaced and oriented to provide sufficient isolation and broadband characteristics, including a GNSS antenna at the center and additional elements for communication purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If multiple antenna elements are arranged in a compact configuration, then the profile height is reduced, but the isolation between antenna elements deteriorates
Solution Approach 1:
The patent transitions from vertical stacking to horizontal arrangement of antenna elements on a baseplate. Multiple antenna elements are positioned at different radial distances and angular positions around the central axis, utilizing the horizontal plane (x-y plane) rather than the vertical dimension (z-axis) to achieve both compact profile and sufficient isolation.
Solution Approach 2:
The antenna elements are positioned asymmetrically on the baseplate with different radial distances (e.g., first antenna element at distance d1, second at d2 where d1 ≠ d2) and different angular positions. This asymmetric arrangement optimizes isolation between elements while maintaining a compact low-profile configuration.
2Reliability
If antenna elements are spaced further apart to improve isolation, then the overall area increases, but the compactness deteriorates
Solution Approach 1:
The patent utilizes the three-dimensional space around the central axis by arranging antenna elements at different radial distances and angular positions. This allows sufficient isolation to be achieved within a compact circular area on the baseplate, rather than requiring linear spacing that would increase the overall footprint.
Solution Approach 2:
The antenna elements are arranged in a circular pattern around the central axis, with positions defined by radial distances and angular positions. This circular/spheroidal arrangement efficiently packs multiple elements within a compact area while maintaining adequate separation for isolation.
Data Source
AI summary
An antenna arrangement includes a baseplate having a center, a bottom face and a top face. At least two first antenna elements are arranged on the top face and extend radially away from the center, Each of the at least two first antenna elements comprises a with respect to the base plate essentially perpendicular arranged first section, which is arranged radially towards the center. The first section merges into a second section which is arranged with respect to the base plate essentially parallel and extends away from the first section in a first direction. The second section merges into a third section arranged with respect to the base plate essentially perpendicular extending away from the second section above the first section. The third section merges into a fourth section arranged with respect to the base plate essentially parallel extending away from the third section opposite to the first direction.