Radar Antenna Layout for Low Mutual Coupling Reception
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Solution Overview
Problem
Existing antenna devices face challenges in achieving high receiving performance due to high mutual coupling between receiving elements, which leads to noise interference and deteriorated detection characteristics, especially in radar systems.
Innovation Solution
The antenna device is designed with a transmitting antenna and a receiving antenna, where the maximum mutual coupling between receiving elements is minimized by optimizing their arrangement and shape, using Substrate Integrated Waveguide (SIW) for transmitting elements and quasi-Yagi antennas for receiving elements, and arranging them such that the receiving elements have reduced inter-element coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If receiving elements are arranged closely to improve receiving sensitivity, then receiving performance is improved, but mutual coupling between receiving elements increases causing noise interference
Solution Approach 1:
The antenna system is segmented into separate transmitting and receiving antenna groups with different element configurations. The receiving antenna elements are designed with specific spacing and geometric arrangements that segment the coupling paths, reducing mutual coupling noise while maintaining receiving sensitivity.
Solution Approach 2:
Different local configurations are applied to transmitting and receiving elements. The receiving elements use specific local arrangements (such as orthogonal polarizations or specific geometric patterns) that locally reduce coupling effects, while transmitting elements use configurations optimized for transmission efficiency.
2Power
If transmitting elements use high-gain configurations to improve transmission distance, then transmission performance is improved, but mutual coupling between transmitting elements increases
Solution Approach 1:
Asymmetric configurations are employed where transmitting elements use high-gain directional patterns while receiving elements use omnidirectional or differently polarized patterns. This asymmetry allows the transmitting side to achieve high power efficiency while the receiving side maintains low coupling through its different configuration.
Solution Approach 2:
The system transitions to using multiple dimensions for element arrangement, including three-dimensional spacing and orthogonal polarizations. This dimensional approach allows high-gain transmission in one dimension while reducing coupling in other dimensions through proper spatial separation and polarization orthogonality.
Data Source
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AI summary
According to one embodiment, an antenna device includes a transmitting antenna including a plurality of transmitting elements, and a receiving antenna including a plurality of receiving elements. A maximum value of a mutual coupling between the plurality of receiving elements is less than a maximum value of a mutual coupling between the plurality of transmitting elements.