Single-Feed Antenna Layout for Compact Multi-Band MIMO
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Solution Overview
Problem
Current mobile terminals face challenges in achieving good MIMO performance due to limited space, which restricts the frequency bands that a MIMO antenna can cover.
Innovation Solution
The proposed antenna apparatus uses a strip conductor with a feed point at its middle, connected to a feed, and a ground point nearby connected to a grounding stub. This design excites both CM and DM wire antenna modes, allowing the antenna to cover multiple frequency bands when miniaturized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to fit limited mobile terminal space, then the device compactness is improved, but the frequency band coverage capability deteriorates
Solution Approach 1:
The patent divides the antenna structure into multiple segments including a strip conductor with multiple ground points, feeding points, and coupled resonators. This segmentation allows each segment to contribute to different frequency bands, enabling a compact overall structure to cover multiple frequency ranges simultaneously.
Solution Approach 2:
The patent implements nested structures where smaller resonators and ground points are positioned within or alongside larger antenna elements. The coupled resonators are nested along the strip conductor, and multiple ground points are distributed along the strip, creating a nested configuration that maximizes frequency band coverage within limited space.
2Adaptability or versatility
If multiple frequency bands are covered using traditional antenna designs, then the frequency band coverage is improved, but the antenna size increases
Solution Approach 1:
The patent designs the strip conductor and coupled resonators to serve multiple functions simultaneously. The same structural elements support both CM and DM modes, and the distributed ground points enable the antenna to operate across multiple frequency bands without requiring separate antenna structures for each band.
Solution Approach 2:
The patent transitions from traditional planar antenna designs to a multi-dimensional configuration by distributing ground points along the strip conductor and positioning coupled resonators at different locations. This spatial arrangement in multiple dimensions enables compact size while maintaining broad frequency coverage.
3Volume of moving object
If a compact antenna structure is used, then the device integration is improved, but the MIMO performance deteriorates
Solution Approach 1:
The patent applies local quality by creating regions with different electromagnetic characteristics along the strip conductor. The coupled resonators and distributed ground points create localized areas that support different current distributions, enabling both CM and DM modes to coexist in a compact structure while maintaining good MIMO performance.
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 design effectively covers more frequency bands while being miniaturized, enhancing MIMO performance in limited mobile terminal spaces.
Implementation Method 1
Two different resonance frequencies may be generated on the strip conductor. In the first aspect, the first current may be referred to as a first current, and the second current may be referred to as a second current.
Data Source
AI summary
A single feed antenna design is conducted on a radiator of a specific shape (for example, a strip radiator or a slot radiator) to excite a plurality of antenna modes. For example, performing a feed design on a strip radiator may excite a CM wire antenna mode and a DM wire antenna mode. For another example, performing a feed design on a slot radiator may feed a CM slot antenna mode and a DM slot antenna mode. The antenna design may be used to cover a plurality of frequency bands when an antenna is miniaturized.