Proximity-Fed Dipole Antenna for Dual-Polarization
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Solution Overview
Problem
Conventional dipole antennas face challenges in achieving high bandwidth and reducing intermodulation risks due to direct feeding methods, which also increase manufacturing costs and complexity.
Innovation Solution
The dipole antenna design incorporates two pairs of dipoles arranged around a central region with proximity-fed baluns positioned on opposite sides, splitting feed lines at junctions to reduce the number of feed lines required and eliminate solder joints, allowing for dual-polarization operation and improved isolation between polarizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct feeding methods are used to connect feed lines to dipoles, then connection reliability is improved, but intermodulation risks increase and manufacturing costs increase
Solution Approach 1:
The patent introduces feed probes as intermediary elements that field-couple with the dipoles through proximity coupling rather than direct physical connection. The feed probes act as mediators that transfer energy electromagnetically, eliminating direct solder joints while maintaining reliable energy transfer and reducing intermodulation distortion associated with traditional direct feeding methods
2Stability of the object's composition
If conventional direct feeding methods are used, then connection stability is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical connection system (solder joints and direct physical attachments) with an electromagnetic field coupling system. The feed probes field-couple with the dipoles through proximity coupling, substituting mechanical assembly with electromagnetic energy transfer, thereby reducing manufacturing complexity while maintaining connection stability
3Reliability
If multiple feed lines are used to drive each dipole, then feeding reliability is improved, but manufacturing costs increase
Solution Approach 1:
The patent merges the feeding function into a single integrated feed probe structure that field-couples with the dipole, combining multiple potential connection points into one unified coupling mechanism. This reduces the number of separate feed lines and connection points required, simplifying manufacturing while maintaining reliable energy transfer to the dipole
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
This design enhances bandwidth, reduces intermodulation risks, and lowers manufacturing costs by using a proximity-fed arrangement with fewer feed lines, while maintaining effective dual-polarization capabilities across various frequency ranges.
Implementation Method 1
the feed probes are spaced from the dipoles so as to field-couple with the dipoles
Data Source
AI summary
A dipole antenna comprising a base; first and second pairs of dipoles positioned in front of the base and arranged around a central region; a first feed line which extends from the base towards the dipoles and splits at a first junction positioned in front of the base into a first pair of feed probes each of which is coupled to a respective one of the first pair of dipoles; and a second feed line which extends from the base towards the dipoles and splits at a second junction positioned in front of the base into a second pair of feed probes each of which is coupled to a respective one of the second pair of dipoles. The feed probes are spaced from the dipoles so as to field-couple with the dipoles. In one embodiment, the first pair of feed probes is positioned on a first side of the dipoles and the second pair of feed probes is positioned on a second side of the dipoles opposite to the first side. In another embodiment, the dipoles are printed on a PCB.