Nested MIMO Antenna with Asymmetric Radiators for Size and Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
MIMO antennas face challenges in miniaturization, slimming, and reducing interference between radiators, which affects their performance and side lobe characteristics.
Innovation Solution
The design incorporates a configuration of radiators with varying sizes and symmetric shapes centered around a third feeding line, with specific slot formations to improve beam pattern characteristics, allowing for miniaturization and reduced interference by operating in an orthogonal mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a MIMO antenna includes a plurality of radiators, then multi-input multi-output functionality is achieved, but the overall size of the antenna increases
Solution Approach 1:
The patent implements nested array structures where radiators are arranged in concentric circular patterns with different radii. The first array includes radiators at a first radius from the center, while the second array includes radiators at a second radius, creating a compact nested configuration that achieves MIMO functionality without proportional size increase
Solution Approach 2:
The patent transitions from conventional planar or linear array arrangements to a three-dimensional circular array configuration. Radiators are positioned at different radial distances and angular positions around a central axis, utilizing spatial distribution in multiple dimensions to achieve compact MIMO functionality
2Adaptability or versatility
If a MIMO antenna includes a plurality of radiators, then multi-input multi-output functionality is achieved, but interference phenomenon between beam patterns increases
Solution Approach 1:
The patent employs asymmetric amplitude distribution among radiators, where radiators in different arrays have different excitation amplitudes. The first array has a first amplitude distribution pattern while the second array has a second amplitude distribution pattern, creating asymmetric radiation characteristics that reduce beam pattern interference
Solution Approach 2:
The patent designs the amplitude and phase distributions of radiators to create equipotential radiation patterns in specific directions. By carefully controlling the excitation parameters, the antenna achieves uniform radiation intensity in desired directions while minimizing interference in other directions
3Device complexity
If conventional array configurations are used, then simplicity of structure is maintained, but side lobe characteristics deteriorate
Solution Approach 1:
The patent applies different amplitude distribution patterns to different local regions (arrays) of the antenna structure. The first array has a first amplitude distribution optimized for its region, while the second array has a second amplitude distribution optimized for its region, allowing each local area to contribute optimally to overall side lobe suppression
Solution Approach 2:
The patent optimizes side lobe characteristics by carefully controlling and varying key parameters including the radii of the circular arrays, the angular positions of individual radiators, and the excitation amplitudes and phases. These parameter adjustments enable side lobe suppression without requiring complex structural modifications
Data Source
AI summary
An array antenna includes: a first radiation body of which one end is connected to a first power supply line; a second radiation body of which one end is connected through a second power supply line connected to the other end of the first radiation body; a third radiation body of which one end is connected through a third power supply line connected to the other end of the second radiation body; and a fourth radiation body of which one end is connected through a fourth power supply line connected to the other end of the third radiation body, wherein the first and second radiation bodies are formed to be symmetrical with the third and fourth radiation bodies on the basis of the third power supply line.