Multi-band Antenna Using Folded Radiation Structure
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Solution Overview
Problem
Existing multi-band antennas, such as Planar Inverted-F Antennas (PIFAs), face challenges in achieving compactness and efficient multi-band reception due to the large planar area required for the radiation portion and the inability to adjust the distance between the radiation and base planes, limiting their suitability for compact portable devices.
Innovation Solution
A multi-band antenna design featuring a coupling portion for signal feeding, with a first and second radiation portion on a shared surface and a third radiation portion above, allowing for adjustable intercoupling to cover various frequency bands, including GSM, GPS, WCDMA, and UMTS, using stamped metal and a non-conductive fixture for compactness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a planar radiation portion is used in a PIFA antenna, then the antenna can support multiple frequency bands, but the planar area required becomes large
Solution Approach 1:
The patent transitions from a planar two-dimensional radiation structure to a three-dimensional folded structure. The radiation portion is folded along a fold line to form multiple sections that extend in different directions and planes, effectively utilizing vertical space rather than requiring large horizontal area. This dimensional transformation allows the antenna to maintain multi-band functionality while significantly reducing the required planar footprint.
Solution Approach 2:
The folded radiation portions are arranged to nest within each other spatially, with inner sections positioned within the bounding box of outer sections. This nested arrangement maximizes space utilization and minimizes the overall antenna footprint while maintaining the electrical length required for multi-band operation.
2Adaptability or versatility
If the distance between radiation plane and base plane is fixed in a PIFA antenna, then the structure is simple, but the frequency/bandwidth cannot be adjusted as desired
Solution Approach 1:
The patent introduces adjustable mechanisms that allow the distance between the radiation portion and base plane to be dynamically changed. By making this distance variable rather than fixed, the antenna can be tuned to different frequency bands and bandwidth requirements. The adjustability is achieved through mechanical or electromagnetic means that modify the effective electrical length and coupling between radiation elements.
Solution Approach 2:
The patent employs parameter adjustment mechanisms that allow key dimensional parameters (such as the distance between radiation plane and base plane, and the lengths of folded sections) to be varied. By changing these parameters, the resonant frequencies and impedance characteristics of the antenna can be optimized for different operating bands, providing flexibility without requiring complete redesign.
3Volume of moving object
If the antenna size is reduced for compact portable devices, then portability is improved, but multi-band reception capability is compromised
Solution Approach 1:
The patent uses three-dimensional folding to pack more electrical length into a smaller volume. By folding the radiation portion multiple times and arranging sections in different spatial planes, the antenna achieves the required electrical dimensions for multi-band operation within a compact footprint suitable for portable devices.
Solution Approach 2:
The adjustable distance mechanism allows the antenna to electrically expand or contract its effective dimensions. When larger electrical length is needed for lower frequency bands, the distance between radiation elements can be increased; for higher frequencies, the distance is reduced. This dynamic adjustment enables multi-band coverage within a compact physical structure.
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 effectively supports multiple wireless communication bands with adjustable characteristics, enabling compact implementation in portable devices while optimizing radiation gain and bandwidth, addressing the limitations of prior art in size and frequency coverage.
Implementation Method 1
a first radiation portion installed on a second surface crossing the first surface and coupled to the coupling portion, the first radiation portion comprising at least one section; and a second radiation portion installed on the second surface and coupled to the coupling portion... the first radiation portion and the second radiation portion have an intercoupling
Implementation Method 2
a third radiation portion installed on the first surface and coupled to the coupling portion, the third radiation portion having an intercoupling with the first radiation portion and second radiation portion
Data Source
AI summary
A multi-band antenna includes a bent flat copper antenna forming a radiation surface to provide GSM-850/900/1800/1900 or GPS multi-band applications, and an auxiliary antenna coupled to the radiation surface provide WCDMA-2100/UMTS-2100 multi-band applications. The radiation surface and the auxiliary antenna are coupled to generate the required bandwidth for multiple radiation bands and to optimize the gain of radiation, so that the multi-band antenna can provide a broad range of services.