Compact MIMO Antenna Array With Reflective Element Isolation
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Solution Overview
Problem
Modern radar systems require large antenna arrays for high isolation between transmitting and receiving antennas, which increases the size and length of the antenna array, affecting sensitivity and dynamic range, and existing methods to achieve high isolation either increase the distance between antennas or result in parasitic signal interference.
Innovation Solution
A compact multiple-input and multiple-output (MIMO) antenna array structure is designed with a reflective element positioned between radiating and re-radiating components, allowing for high isolation without increasing the distance between antennas, using a grounded reflective element to create an additional path for parasitic signals that compensates for the main signal path, thereby minimizing isolation index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between transmitting and receiving antennas is increased to achieve high isolation, then isolation between antennas is improved, but the size and length of the antenna array increases
Solution Approach 1:
A reflective element is introduced as an intermediary component between the transmitting and receiving antennas. This reflective element creates additional signal paths that interfere destructively with the direct parasitic signals, thereby achieving high isolation without requiring large antenna spacing. The reflective element acts as a mediator that enables isolation performance while maintaining compact array dimensions.
Solution Approach 2:
The solution moves from a one-dimensional spacing approach to a multi-dimensional configuration by introducing reflective elements that create signal paths in different spatial dimensions. The reflective elements are positioned at specific angles and distances, creating three-dimensional signal paths that interfere with parasitic signals without requiring increased linear separation between antennas.
2Object-generated harmful factors
If the distance between antennas is increased to reduce parasitic signal interference, then parasitic leakage is reduced, but the antenna array size increases
Solution Approach 1:
The reflective elements are strategically positioned to convert the harmful parasitic signals into beneficial destructive interference patterns. By carefully designing the position and orientation of reflective elements, the parasitic signals that would normally degrade performance are redirected to create cancellation effects, transforming a harmful phenomenon into a useful isolation mechanism.
Solution Approach 2:
Reflective elements serve as intermediary components that manipulate parasitic signal paths. These intermediaries create additional reflection paths that interfere with direct parasitic coupling between antennas, reducing harmful interference without requiring increased physical separation between antenna elements.
3Reliability
If a large antenna array is used to achieve high isolation, then isolation between transmitting and receiving antennas is improved, but losses at high frequencies increase
Solution Approach 1:
The invention extracts and addresses the isolation problem locally between antenna pairs rather than requiring global increases in array dimensions. By placing reflective elements specifically between transmitting and receiving antenna pairs, the solution achieves isolation without expanding the overall array size, thereby minimizing high-frequency losses that would result from larger structures and longer feeding lines.
Solution Approach 2:
The solution changes the geometric parameters of the antenna system by introducing reflective elements at optimized positions and angles. This parameter optimization enables high isolation performance while maintaining compact dimensions, reducing the electrical length of current paths and minimizing high-frequency losses without requiring large array expansions.
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 provides high isolation between antennas, reducing the size and length of the antenna array, minimizing losses at high frequencies, and maintaining performance characteristics while reducing the length of feeding lines and parasitic leakage, enabling a compact MIMO antenna array for 3D/4D radar systems.
Implementation Method 1
reflective components positioned between the first planar re-radiating components and the second planar re-radiating components
Implementation Method 2
first planar re-radiating components and second planar re-radiating components
Data Source
AI summary
An antenna system includes a first antenna including first radiating components and first planar re-radiating components, a second antenna including second radiating components and second planar re-radiating components, and reflective components positioned between the first planar re-radiating components and the second planar re-radiating components.