Housing-Integrated Parasitic Antenna for Compact Multi-Band Devices
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Solution Overview
Problem
Electronic devices with wireless communications capabilities face challenges in achieving compact form factors while covering multiple communications bands and minimizing interference between antennas and other components.
Innovation Solution
An antenna module is integrated into the rear housing wall of an electronic device, utilizing a flexible printed circuit with ground traces and substrate, featuring patches and conductive interconnects that form parasitic elements, allowing for efficient radiation and communication across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional antenna structures are used in electronic devices, then wireless communication functionality is achieved, but the device form factor increases and space is consumed
Solution Approach 1:
The patent combines the antenna structure with the housing wall by making the housing wall itself conductive and serving as part of the antenna ground plane. The conductive housing wall integrates structural support and antenna functionality, eliminating the need for separate antenna components and reducing overall device volume while maintaining wireless communication performance.
Solution Approach 2:
The housing wall serves multiple functions: it provides mechanical structural support, acts as a conductive ground plane for the antenna, and enables wireless radiation. This multi-functionality reduces the number of separate components needed, thereby reducing the volume occupied by antenna structures while preserving communication reliability.
2Area of stationary object
If antenna size is reduced to achieve compact form factor, then device size decreases, but communication band coverage and performance deteriorate
Solution Approach 1:
The patent transitions from planar antenna elements to a three-dimensional configuration where patches are positioned at different heights above the conductive housing wall. This vertical dimensionality allows the antenna to achieve multiple resonant frequencies and broader band coverage while maintaining a compact footprint area, as the effective radiating area extends into the third dimension.
Solution Approach 2:
The antenna structure employs nested patches where smaller patches are positioned within or near larger patches at different vertical levels. This nesting arrangement allows multiple resonant modes to coexist in a compact space, enabling broad bandwidth coverage without increasing the overall antenna footprint area.
3Adaptability or versatility
If multiple antennas are incorporated to cover more bands, then communications coverage increases, but interference between antennas and components increases
Solution Approach 1:
The patent employs patches of different sizes at different vertical positions, where each patch is optimized for specific frequency ranges. Larger patches handle lower frequencies while smaller patches handle higher frequencies, reducing mutual interference between elements. This local optimization of patch characteristics minimizes harmful interactions while maintaining broad band coverage.
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 enables antennas to occupy minimal space within the device while maintaining satisfactory performance and efficiency in wireless communications, maximizing display area by reducing the need for larger antenna regions.
Implementation Method 1
The first patch may indirectly feed the second patch across the first gap. The second patch may form a first parasitic element for the antenna.
Implementation Method 2
The first patch may indirectly feed the third patch across the second gap. The third patch and the conductive interconnect may form a second parasitic element for the antenna.
Implementation Method 3
An electronic device may be provided with an antenna module having an antenna that radiates through a rear housing wall.
Data Source
AI summary
An electronic device may be provided with an antenna that radiates through a rear housing wall. The antenna may include a first patch and a second patch in a first plane and may include a third patch in a second plane. The antenna may include a conductive interconnect that couples the third patch to a ground trace. The first patch may be separated from the second patch by a first gap. The first patch may be separated from the third patch by a second gap. The first patch may be directly fed, may indirectly feed the second patch across the first gap, and may indirectly feed the third patch across the second gap. The third patch may be formed from a conductive support plate of the rear housing wall.