Multi-band Antenna Using Folded Patches for Mobile Devices
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Solution Overview
Problem
Miniaturization of multi-mode mobile stations is hindered by the need for antennas that can effectively transduce signal energy across multiple disparate frequency bands without increasing dimensions, as traditional antennas like PIFAs have narrow bandwidths and introduce EMI when enhanced with parasitic elements.
Innovation Solution
A compact tri-dimensional antenna configuration using L-shaped and folded patches, where one patch is folded to extend in planar directions offset from another, allowing for operation across a wide range of frequencies, including 850, 900, 1800, 1900, and 2200 MHz bands, while reducing spatial requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional PIFA antenna is used to transduce signal energy at mobile station, then compact size and low profile are achieved, but bandwidth is narrow and EMI is introduced when parasitic elements are added
Solution Approach 1:
The patent transitions from conventional two-dimensional planar antenna designs to a three-dimensional folded patch configuration. The antenna patch is folded along one or more axes to create a立体 structure that achieves multi-band operation and wider bandwidth without requiring additional parasitic elements, thereby avoiding EMI issues while maintaining compact form factor suitable for mobile devices
2Adaptability or versatility
If antenna dimensions are increased to improve multi-band operation, then frequency coverage is enhanced, but spatial requirements increase and miniaturization is limited
Solution Approach 1:
The patent employs a folded patch configuration where the antenna element is bent or folded along one or more axes to create a three-dimensional structure. This dimensional transformation allows the antenna to achieve extended frequency coverage and multi-band operation within a compact volume, effectively packing more electrical length into a smaller physical space without increasing the overall footprint
Solution Approach 2:
The folded patch structure effectively nests additional antenna elements and resonant paths within the folded configuration itself, allowing multiple resonant frequencies and bands to be achieved within a single compact structure rather than requiring separate antenna elements that would increase overall volume
3Adaptability or versatility
If parasitic elements are added to enhance PIFA bandwidth, then frequency range is expanded, but device complexity and EMI increase
Solution Approach 1:
The patent achieves bandwidth enhancement through dimensional transformation of a single patch element rather than adding multiple parasitic elements. The folded configuration creates multiple resonant modes and frequency bands within one integrated structure, simplifying the overall antenna system while avoiding the complexity and EMI issues associated with multiple interacting parasitic elements
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 enables efficient signal energy transduction across multiple frequency bands, facilitating increased miniaturization of mobile stations and reducing EMI, while maintaining compact dimensions suitable for handheld devices.
Implementation Method 1
The antenna is resonant at a lower frequency band and at a higher frequency band
Data Source
AI summary
An antenna, and an associated methodology, for a portable radio device, such as a mobile station capable of operation at a plurality of frequency bands spread across a wide range of frequencies. The antenna includes a first antenna patch and a second antenna patch. The first antenna patch comprises an L-shaped patch disposed upon a substrate. A second antenna patch forms a folded patch formed of three contiguous portions, folded about fold lines in a manner to cause the second antenna patch to include a first contiguous portion that extends upwardly beyond the first antenna patch at an angle perpendicular thereto. Second and third contiguous portions are formed by folding additional portions of the second antenna patch about additional fold lines.