Bent Monopole Antenna with Shared Segments for Tri-Band WiMAX
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-band antennas are often too large for portable devices and suffer from inefficiencies due to plus-shaped junctions, which lead to uneven signal distribution across frequency bands.
Innovation Solution
A tri-band antenna design featuring three bent monopoles with a shared feedline segment and distinct segment widths, forming a T-junction, allowing for efficient signal distribution across 2.3-2.7 GHz, 3.3-3.7 GHz, and 5.8 GHz WiMAX bands with a compact layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plus-shaped junction is used in multi-band antenna design, then multiple frequency bands can be covered, but the antenna size becomes too large for portable devices
Solution Approach 1:
The patent merges multiple monopole branches into a compact T-junction configuration where branches are positioned closer together and share common feedline segments. This combining approach reduces the overall antenna footprint while maintaining multi-band functionality through shared structural elements and optimized current paths.
Solution Approach 2:
The patent transitions from a planar plus-shaped layout to a three-dimensional bent monopole structure. By bending the monopole branches in multiple directions and utilizing vertical space, the antenna achieves compact horizontal footprint while maintaining the electrical length required for multi-band operation.
2Adaptability or versatility
If a plus-shaped junction is used in multi-band antenna design, then multiple frequency bands can be covered, but signal distribution becomes uneven across bands
Solution Approach 1:
The patent applies different segment widths to different parts of the antenna structure. The feedline segment has a first width, while the monopole branches have different widths optimized for their respective frequency bands. This local variation in dimensional properties enables tailored impedance matching and uniform signal distribution across all three frequency bands.
Solution Approach 2:
The patent modifies the geometric parameters of the antenna structure, specifically varying the width of different segments and the bend angles of monopole branches. These parameter changes are optimized to achieve consistent signal distribution across WiMAX bands 2.3-2.7 GHz, 3.3-3.7 GHz, and 5.8 GHz, preventing the uneven signal distribution characteristic of plus-shaped junctions.
3Reliability
If multiple antennas are used for different frequency bands, then communication performance in each band is optimized, but device complexity increases
Solution Approach 1:
The patent designs a single antenna structure that universally serves multiple frequency bands through three bent monopole branches. Each branch is configured to resonate at a specific WiMAX band, allowing one antenna system to replace multiple separate antennas while maintaining optimized communication performance for each band.
Solution Approach 2:
The patent segments the antenna into three distinct bent monopole branches, each optimized for a specific frequency band. This segmentation allows each branch to be independently tuned for its target band while sharing common feedline infrastructure, reducing overall complexity compared to using three separate complete antenna systems.
Data Source
AI summary
A bent monopole antenna with shared segments is capable of tri-band communication. In an example embodiment, an antenna assembly includes a substrate, a first bent monopole, a second bent monopole, and a third bent monopole. The first, second, and third bent monopoles are disposed on the substrate. The first bent monopole includes a feedline segment and a first segment. The second bent monopole includes the feedline segment and the first segment. The third bent monopole includes the feedline segment and a second segment. The first, second, and third bent monopoles share the feedline segment, while the first and second bent monopoles also share the first segment. A T-junction is formed by the feedline segment, the first segment, and the second segment. In an example implementation, the first segment has a first width, and the second segment has a second width, with the first width being greater than the second width.