Antenna Array Grounding Structures for ECC Reduction
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Solution Overview
Problem
In multi-antenna systems integrated into handheld communication devices, the increasing envelope correlation coefficient (ECC) due to shared frequency bands leads to attenuation of antenna radiation characteristics, decreased data transmission rates, and design challenges.
Innovation Solution
The design of an antenna array with specific grounding conductor structures forming no-ground radiating areas and breaches, which reduces the correlation coefficient between antennas by constraining excited current within these areas and improving impedance matching, thereby enhancing radiation efficiency and reducing energy coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are designed to operate in the same frequency band within limited antenna space, then communication function integration is improved, but the envelope correlation coefficient (ECC) increases causing radiation characteristic attenuation
Solution Approach 1:
The ground area between multiple antennas is segmented into isolated ground regions by introducing ground isolation structures (such as ground vias or ground walls). These structures divide the continuous ground plane into separate segments, preventing coupling current from spreading across the entire ground area, thereby reducing ECC while maintaining radiation performance
Solution Approach 2:
Ground isolation structures serve as intermediary elements positioned between multiple antennas. These structures act as mediators that block or redirect coupling currents, preventing direct interaction between antenna ground systems. The isolation structures include ground vias connected to ground planes or ground walls extending between antenna elements
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 effectively reduces the envelope correlation coefficient, enhances antenna radiation efficiency, and improves data transmission rates by optimizing the antenna array's design to minimize energy coupling between antennas.
Implementation Method 1
The first signal source excites the first antenna to generate at least one first resonant mode. The second signal source excites the second antenna to generate at least one second resonant mode
Implementation Method 2
a first coupling distance is formed between the first grounding conductor structure and the second grounding conductor structure such that the first no-ground radiating area has a first breach
Data Source
AI summary
An antenna array includes a ground conductor portion, a first antenna and a second antenna. The ground conductor portion has a first edge and a second edge. The first antenna has a first no-ground radiating area and a first feeding conductor portion. The second antenna has a second no-ground radiating area and a second feeding conductor portion. The first no-ground radiating area is formed and surrounded by a first grounding conductor structure, a second grounding conductor structure, and the first edge, and the first no-ground radiating area has a first breach. The second no-ground radiating area is formed and surrounded by a third grounding conductor structure, a fourth grounding conductor structure, and the second edge, and the second no-ground radiating area has a second breach. The first and second feeding conductor portions are respectively and electrically connected to a first signal source and a second signal source.