Grounded Dipole Antenna Feed Structure for EMI Shielding
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Solution Overview
Problem
Electrical interference between antennas and nearby conductors poses challenges in antenna design, particularly for dipole antennas, which are susceptible to electromagnetic interference and require effective shielding and radiation performance improvements.
Innovation Solution
A dipole antenna design featuring a pair of grounded conductive elements that extend in parallel and diverge, providing increased conducting surface area and shielding at the feed point, reducing susceptibility to electromagnetic interference and offering a cheaper alternative to coaxial feedlines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional dipole antenna is used, then the structure is simple, but electrical interference occurs between the antenna and nearby conductors
Solution Approach 1:
The dipole arm is segmented into multiple conductive elements (first, second, third conductive elements) with different orientations. This segmentation allows each element to serve specific functions: the first element provides shielding against interference from conductors in a first direction, the second element provides shielding in a second direction, and the third element maintains resonant length. This resolves the contradiction by breaking down the simple dipole structure into functional segments that address interference without requiring complete structural redesign.
Solution Approach 2:
Different portions of the antenna structure are given different properties: the first conductive element is positioned to provide shielding in one direction, the second element in another direction, and the third element is designed to maintain the resonant frequency. This local differentiation of functionality allows the antenna to combat electrical interference from multiple directions simultaneously while maintaining overall structural simplicity and resonant performance.
2Object-affected harmful factors
If shielding is added to reduce electrical interference, then interference resistance improves, but manufacturing complexity increases
Solution Approach 1:
The shielding function and the resonant element function are merged into a single integrated dipole arm structure. The first, second, and third conductive elements are all part of the same dipole arm, eliminating the need for separate shielding components. This merging approach provides comprehensive interference protection while maintaining manufacturing simplicity, as the entire structure can be fabricated as a single piece or assembly.
Solution Approach 2:
The dipole arm structure serves multiple functions simultaneously: the first conductive element provides shielding in one direction, the second element provides shielding in another direction, and the third element maintains resonant frequency. This multi-functionality eliminates the need for separate shielding components, reducing manufacturing complexity while providing comprehensive interference protection.
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 design enhances radiation performance, reduces interference, and maintains frequency selectivity, as demonstrated by improved co-polar and cross-polar gain plots and scattering parameters, while being easier and cheaper to manufacture.
Implementation Method 1
a dipole antenna, configured for operation with a first polarization, the dipole antenna comprising: a feed; and a pair of conductive elements fed by the feed, wherein the pair of conductive elements are grounded, and extend in parallel on opposing sides of the feed and then diverge
Implementation Method 2
providing increased conducting surface area and shielding at the feed point, reducing susceptibility to electromagnetic interference
Data Source
AI summary
An apparatus including a dipole antenna, configured for operation with a first polarization, the dipole antenna including a feed; and a pair of conductive elements fed by the feed, wherein the pair of conductive elements are grounded, and extend in parallel on opposing sides of the feed and then diverge.