Narrow-Bezel Multiband Antenna Layout for Thin Metal Tablets
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Solution Overview
Problem
The challenge is to design a compact antenna arrangement that can effectively operate in 5G and LTE WWAN bands within the limited space of low-profile laptop or tablet computer bezels, where metal monocoque shells hinder RF signal passage and traditional antenna designs face signal degradation due to proximity with device screens and electronic components.
Innovation Solution
The proposed antenna arrangement features a ground plane with a feed section, a grounded coupling section, and an extended coupling section, including conductive elements and meander lines, which couple electromagnetically to achieve efficient signal transmission across various frequency bands, including 1.7 GHz to 6 GHz, with parasitic elements and tuning circuits to broaden frequency coverage and adjust electrical length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If metal monocoque shells are used to make devices thinner, then device thickness is reduced, but RF signal passage is hindered
Solution Approach 1:
The antenna is divided into multiple sections (first antenna section, second antenna section, third antenna section) with different orientations and functions. Each section handles specific frequency bands, allowing the antenna system to operate effectively within the constrained space of a thin metal device without requiring large continuous conductive elements that would be blocked by the metal shell.
Solution Approach 2:
The antenna transitions from traditional planar configurations to three-dimensional structures extending in multiple directions (x, y, and z dimensions). The first antenna section extends in a first direction, the second antenna section extends in a second direction perpendicular to the first, and the third antenna section extends in a third direction, creating a spatially distributed antenna system that overcomes the limitations of thin-profile metal enclosures.
2Area of stationary object
If screen area is increased to form larger front real-estate, then display area is improved, but bezel width is reduced making antenna placement difficult
Solution Approach 1:
Different sections of the antenna are assigned to different spatial locations within the device. The first antenna section is positioned in a first region, the second antenna section in a second region, and the third antenna section in a third region. Each location is optimized for specific frequency bands, allowing effective antenna operation in the reduced bezel space without interfering with the large screen area.
3Volume of moving object
If antenna is placed in close proximity to device screen and electronic components, then device compactness is improved, but signal effectiveness is degraded
Solution Approach 1:
The antenna sections are designed with asymmetric orientations and configurations rather than uniform symmetric arrangements. The first antenna section has a different orientation than the second and third sections, allowing each to be optimally positioned relative to nearby electronic components and the screen. This asymmetric布局 minimizes interference while maintaining compact device dimensions.
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 reliable operation in both WLAN and WWAN bands, including challenging low bands like 600-700 MHz, while maintaining a compact form factor, thus addressing the limitations of previous antenna designs in thin, low-profile devices.
Implementation Method 1
The first conductive element of the grounded coupling section is configured to couple electromagnetically with the second portion of the feed line of the feed section during operation of the antenna arrangement.
Implementation Method 2
The extended coupling section comprises a conductive meander line extending generally parallel to the edge of the ground plane
Data Source
AI summary
There is disclosed an antenna arrangement for a portable electronic device, comprising: a ground plane having an edge; and arranged along the edge, in sequence, a feed section, a grounded coupling section, and an extended coupling section. The feed section comprises an RF feed on the ground plane and a feed line extending from the RF feed having a first portion extending substantially perpendicularly from the edge of the ground plane, and a second portion extending from an end of the first portion, substantially parallel to the edge of the ground plane, in a direction away from the grounded coupling section. The grounded coupling section comprises a first conductive element extending substantially parallel to the edge of the ground plane and arranged to overlap or run adjacent to at least a part of the second portion of the feed line of the feed section, and a conductive member to connect the first conductive element to the ground plane. The extended coupling section comprises a conductive meander line extending generally parallel to the edge of the ground plane, one end of the conductive meander line being connected to or configured to couple with a portion of the grounded coupling section, the other end of the conductive meander line being connected to a second conductive element extending substantially parallel to the edge of the ground plane.