Mobile Antenna Frame Layout for 4x4 MIMO Isolation
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Solution Overview
Problem
Current mobile antenna solutions for mobile devices face challenges such as compromised performance in 4x4 MIMO operations due to collocation and poor isolation between MIMO antennas, limited low-band efficiency, and incompatibility with metal back covers, which hinder simultaneous multiband operation and mechanical strength.
Innovation Solution
The antenna system features a metal frame with separate and independent MIMO antennas, utilizing dielectric materials in gaps between segments to enhance performance, allowing for optimal coupling to the chassis mode and efficient operation across multiple frequency bands, including LTE FDD and TDD bands, while maintaining mechanical strength and visual appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MIMO antennas are separately allocated and extra space is utilized, then MIMO capability is achieved, but performance is compromised due to collocation and on-ground location
Solution Approach 1:
The antenna system is divided into distinct segments: a first antenna structure for low-band operation and a second antenna structure for mid-to-high band MIMO operation. These segments are spatially separated and functionally independent, allowing each to optimize performance for its specific frequency band without interference from the other, thus resolving the performance compromise issue.
Solution Approach 2:
The patent utilizes the thickness dimension of the mobile device by positioning the first antenna in the bottom portion and the second antenna in the middle portion along the thickness direction. This three-dimensional arrangement allows both antennas to coexist with adequate isolation, transforming a two-dimensional space constraint into a three-dimensional solution.
2Adaptability or versatility
If low band antenna size is reduced to accommodate MIMO antennas, then MIMO capability is enabled, but low band performance is compromised
Solution Approach 1:
The antenna system is divided into distinct segments: a first antenna structure for low-band operation and a second antenna structure for mid-to-high band MIMO operation. These segments are spatially separated and functionally independent, allowing each to optimize performance for its specific frequency band without interference from the other, thus resolving the performance compromise issue.
Solution Approach 2:
Different portions of the mobile device are assigned different antenna functions: the bottom portion houses the low-band antenna while the middle portion contains the MIMO antenna. This local differentiation allows each antenna to be optimally sized and positioned for its specific function, with the low-band antenna having sufficient size for its frequency requirements.
3Ease of operation
If conductive elongate member is connected to exterior metal frame, then antenna function is achieved, but compatibility with metal back covers is lost
Solution Approach 1:
A dielectric member is introduced as an intermediary between the first antenna (conductive elongate member) and the metal back cover. This dielectric barrier prevents direct electrical contact between the conductive antenna element and the metal back cover, eliminating the incompatibility issue while allowing the antenna to maintain its grounding and functioning through the dielectric isolation.
4Volume of moving object
If MIMO antennas are collocated, then device size is reduced, but isolation between antennas deteriorates
Solution Approach 1:
The patent utilizes the thickness dimension of the mobile device by positioning the first antenna in the bottom portion and the second antenna in the middle portion along the thickness direction. This three-dimensional arrangement allows both antennas to coexist with adequate isolation, transforming a two-dimensional space constraint into a three-dimensional solution.
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
This configuration enables efficient multiband 4x4 MIMO operation, maximizes antenna efficiency at low-frequency bands, and minimizes interaction with user tissues, providing improved radio signal propagation and mechanical reliability.
Implementation Method 1
A dielectric member is disposed in a gap between the first corner segment and the central segment
Implementation Method 2
The first corner segment forms a low band antenna that is configured to radiate on multiple cellular frequency bands
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An antenna system for a mobile device includes a first electrically conductive member having a plurality of segments including at least a first corner segment and a central segment that is disposed adjacent to the first corner segment. A dielectric material is disposed in a gap between the first corner segment and the central segment. A second electrically conductive member is disposed within the mobile device. A first end of the second electrically conductive member is connected to the first corner segment. A portion of the second electrically conductive member away from the first end is electrically connected to a first feeding portion. The central segment is connected to a second feeding portion.