Compact Multi-Band Antenna With 3D Folded Structure
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Solution Overview
Problem
Conventional multi-band antennas, such as Planar Inverted-F Antennas, require large planar areas and cannot be structurally reduced in size to meet the needs of compactness and multi-band reception in portable wireless devices.
Innovation Solution
A compact monopole antenna with a three-dimensional bending structure comprising low and high frequency radiation portions, where the low frequency radiation portion extends along non-parallel planes and the high frequency radiation portion bends at a single point, forming a coupling effect that reduces the antenna's size and enhances frequency coupling, allowing for efficient multi-band operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a planar radiation portion is used in conventional multi-band antennas, then the antenna can support multiple frequency bands, but the antenna requires a large planar area and cannot be structurally reduced in size
Solution Approach 1:
The patent transitions from a two-dimensional planar radiation structure to a three-dimensional bent structure. The radiation portion is bent along a curved path in three-dimensional space, allowing the antenna to achieve multi-band operation with a compact footprint. This dimensional change enables the antenna to maintain electrical length for multiple frequencies while occupying minimal planar area on the device housing.
Solution Approach 2:
The bent radiation portion is designed to fit within the limited space of compact portable devices by nesting the antenna structure along the curved surface of the device housing. The antenna follows the contours of the device, effectively utilizing available three-dimensional space rather than requiring large flat areas.
2Adaptability or versatility
If the distance between radiation plane and base plane is fixed in conventional antennas, then the structure is simple, but the frequency/bandwidth cannot be adjusted as desired
Solution Approach 1:
The patent introduces adjustability by making the distance between the radiation portion and base plane variable rather than fixed. The support structure allows the radiation portion to be positioned at different distances from the base plane, enabling dynamic adjustment of resonant frequency and bandwidth characteristics to match different wireless communication standards.
Solution Approach 2:
The patent enables frequency and bandwidth adjustment by changing the physical parameter of distance between radiation and base planes. By varying this distance, the electrical characteristics of the antenna are modified, allowing the same physical structure to operate across multiple frequency bands and bandwidth requirements.
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 three-dimensional structure effectively reduces the antenna's size while improving frequency coupling, expanding the usable bandwidth and supporting multiple frequency bands, including GSM and UMTS, making it suitable for compact portable devices.
Implementation Method 1
a controllable intercoupling between the low/high frequency radiation portions is established, with the intercoupling the overall characteristics and performance of the antenna are improved
Data Source
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AI summary
A multi-band antenna (20) of compact size includes a conductor of uniform cross-section folded to form the antenna (20) with a connection portion (CP), a low-frequency first radiation portion (L), and a high-frequency second radiation portion (H). The connection portion (CP) has a feeding point (S) for signal feeding. The first and second radiation portions (L, H) connect to two ends of the connection portion (CP) . The first radiation portion (L) is folded along two different planes (P1, P2) to form three main sections (L1, L3, L5). The second radiation portion (H) is folded along a plane to form two sections (H1, H2). A terminal section (L5) of the first radiation portion (L) and a terminal section (H2) of the second radiation portion (H) are parallel, such that radiation of these two sections is coupled to enhance radiation characteristics of the antenna (20). Also, the folded structure helps to achieve compact size of the antenna (20).