Low Height Antenna With Folded Bars And Sideways Feed
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Solution Overview
Problem
Existing antennas are not optimized for low height while maintaining effective performance across multiple frequency bands, particularly for WIFI applications, where space constraints are a significant challenge.
Innovation Solution
The antenna design features a low-profile configuration with a ground plane and antenna plane connected by folded bars, incorporating a feed line that is strategically positioned between the planes to minimize height while ensuring reliable electrical connectivity and performance across dual bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the antenna uses a conventional ground plane configuration, then the antenna structure is simple, but the height is too large for small devices
Solution Approach 1:
The antenna structure is segmented into multiple functional layers: ground plane with ground slots, radiation element with feed slots, and short-circuiting bars. This segmentation allows each layer to be optimized independently for low height while maintaining overall antenna performance
Solution Approach 2:
The patent implements a nested configuration where the radiation element is positioned above the ground plane at a reduced height, with short-circuiting bars connecting them. The feed line is nested within the structure, guided through the ground plane to the radiation element, creating a compact nested arrangement that minimizes height
2Length of moving object
If the antenna plane is placed close to the ground plane to reduce height, then the height is reduced, but the electrical connection and performance are compromised
Solution Approach 1:
Short-circuiting bars are introduced as intermediary elements connecting the ground plane to the radiation element. These bars provide reliable electrical connection while allowing the radiation element to be positioned at a reduced height above the ground plane
Solution Approach 2:
The patent replaces traditional mechanical feed structures with a slot-based feed system. Feed slots in the radiation element and ground slots in the ground plane create electrical connections through electromagnetic coupling, eliminating the need for complex mechanical connectors and enabling lower height
3Reliability
If the feed line is guided through the ground plane to the antenna plane, then the electrical connection is reliable, but the bandwidth is reduced
Solution Approach 1:
The patent implements local quality optimization by creating specific slot geometries in strategic locations: ground slots in the ground plane and feed slots in the radiation element. These locally optimized slot configurations maintain reliable electrical connection while preserving broadband performance across multiple frequency bands including 2.4 GHz and 5 GHz WIFI bands
Data Source
Figure 1
Figure 2~3
AI summary
Low height antenna (1) with a ground plane (3) and an antenna plane (2), whereby the antenna plane is arranged on the ground plane by at least one bar (4,5,6), whereby a feed line is guided sideways between the ground plane and the antenna plane to a feed contact (4) of the antenna plane.