Folded Monopole Antenna Array with Feedline-Routing Cavity
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Solution Overview
Problem
Vertically stacked multiband antennas face issues with feed cables scattering fields incident on lower antennas, distorting direction-finding accuracy due to their hanging position.
Innovation Solution
The implementation of a folded monopole antenna array design where the parasitic arm of each antenna defines a cavity to house the feedline, preventing it from hanging in front of other antennas and reducing field scattering by routing the feedlines through these cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feed cables are hung down to supply electrical drive signal to upper antennas, then electrical connection is achieved, but field scattering occurs that distorts direction-finding accuracy
Solution Approach 1:
The feedline is nested within the cavity formed by the parasitic arm of the folded monopole antenna. This allows the feedline to be concealed inside the antenna structure itself, preventing it from hanging in front of lower antennas and scattering incident fields, thereby resolving the contradiction between maintaining electrical connection and preserving measurement precision
Solution Approach 2:
The cavity in the parasitic arm serves as an intermediary structure that houses the feedline. This mediator allows the feedline to pass through without being exposed externally, eliminating the harmful field scattering effect while maintaining the necessary electrical connection to the antenna
2Measurement precision
If feedline is routed through cavity in parasitic arm, then field scattering is reduced, but antenna structure complexity increases
Solution Approach 1:
The parasitic arm of the folded monopole antenna serves multiple functions: it acts as a radiating element for the antenna operation and simultaneously provides a cavity structure to house the feedline. This multi-functionality reduces overall system complexity compared to adding a separate feedline management structure
Solution Approach 2:
The feedline routing function is merged with the parasitic arm structure. The cavity is formed as an integral part of the parasitic arm geometry, combining the antenna element and feedline conduit into a single unified structure, thereby minimizing additional complexity
Data Source
AI summary
An antenna array includes a first ground plane; a second ground plane disposed below the first ground plane; a folded monopole antenna disposed between the first ground plane and the second ground plane, the folded monopole antenna comprising a driven arm, a parasitic arm, and a short connecting the driven arm to the parasitic arm; an antenna disposed above the first ground plane; and a feedline in electrical communication with the antenna such that an electrical signal input to the feedline drives the antenna, wherein the feedline extends through a cavity formed within the parasitic arm of the folded monopole antenna.