MIMO Antenna Isolation via Grounded Radiators
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Solution Overview
Problem
Designing multiple antennas in a limited space while maintaining isolation and optimal radiation patterns is a challenge due to the increasing demand for miniaturization of electronic devices.
Innovation Solution
A multi-input multi-output antenna structure is configured with two dipole antennas and two second grounded radiators, featuring a bent gap between the second grounded radiators to achieve good isolation, allowing the antennas to be close without interfering, and includes coaxial transmission lines for signal connection, enabling resonance across dual frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple antennas are designed in a limited space to meet miniaturization demands, then the device size is reduced, but the isolation between antennas deteriorates
Solution Approach 1:
The patent introduces second grounded radiators as intermediary elements positioned between the dipole antennas. These radiators are electrically connected to ground and act as shielding structures that block electromagnetic coupling between adjacent dipole antennas, thereby improving isolation without increasing the overall antenna structure size
Solution Approach 2:
The patent divides the antenna system into separate functional modules: dipole antennas for radiation and second grounded radiators for isolation. By segmenting the antenna structure into these distinct components with specific spatial arrangements, the design achieves both compact size and adequate isolation between antenna elements
2Volume of moving object
If multiple antennas are placed close together to reduce device size, then the volume is reduced, but the radiation patterns are affected
Solution Approach 1:
The second grounded radiators serve as intermediary shielding structures that prevent mutual interference between dipole antennas. By blocking unwanted electromagnetic fields between closely spaced antennas, the radiation patterns of each dipole antenna remain intact and omnidirectional, even when antennas are positioned close together for miniaturization
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 antenna structure achieves good isolation and omnidirectional radiation patterns, allowing for efficient dual-frequency operation in a compact size, with improved antenna efficiency and reduced interference.
Implementation Method 1
Each dipole antenna is used for resonating a first frequency band and a second frequency band
Implementation Method 2
Each second grounded radiator has a second grounded end. A positive end of each coaxial transmission line is connected to the feed-in end of the corresponding dipole antenna, and a negative end of each coaxial transmission line is connected to the first grounded end of the corresponding dipole antenna and the second grounded end of the corresponding second grounded radiator
Data Source
AI summary
Provided is an electronic device including a multi-input multi-output antenna structure configured on a substrate, and the multi-input multi-output antenna structure includes two dipole antennas and two second grounded radiators. Each dipole antenna is used for resonating a first frequency band and a second frequency band. Each dipole antenna includes a feed-in radiator and a first grounded radiator. The feed-in radiator has a feed-in end. The first grounded radiator is disposed beside the feed-in radiator and has a first grounded end. The two second grounded radiators are positioned between the two dipole antennas, the two second grounded radiators are separated from the two first grounded radiators and are respectively corresponding to the two first grounded radiators, and a bent gap is formed between the two second grounded radiators.