Electrically Coupled Bowtie Antenna for Conformal UAV Installation
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Solution Overview
Problem
Conventional antennas for small aircraft, such as UAVs, face challenges in minimizing aerodynamic drag and radar cross-section while maintaining electrical performance, especially when installed on non-planar surfaces, due to their protruding designs and sensitivity to conductive surfaces.
Innovation Solution
An electrically coupled bowtie antenna assembly with a bowtie-shaped conductive element and a feed line on a dielectric material, where electrical coupling occurs through electric fields within the dielectric material, eliminating direct contact and thus reducing mechanical damage risks, and incorporating a ground plane to minimize performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common monopole and dipole antennas are used, then communication functionality is provided, but aerodynamic drag increases and radar cross-section increases
Solution Approach 1:
The patent replaces the traditional mechanical protruding antenna structure with an electrically coupled planar antenna system. The feed line and bowtie antenna are separated by a dielectric layer, eliminating the need for mechanical contact and protruding structures, thereby reducing aerodynamic drag and radar cross-section while maintaining communication functionality.
Solution Approach 2:
The patent transitions from a three-dimensional protruding antenna structure to a two-dimensional planar configuration. The antenna elements are arranged in separate layers (first layer for bowtie antenna, second layer for feed line) with vertical separation, achieving a low-profile design that minimizes aerodynamic interference while preserving electrical performance.
2Adaptability or versatility
If antennas are installed near conductive surfaces, then conformal installation is achieved, but electrical performance changes occur
Solution Approach 1:
The patent introduces a dielectric layer as an intermediary between the feed line and the bowtie antenna. This dielectric separation layer acts as a mediator that isolates the electrical fields, preventing direct interaction with conductive surfaces and maintaining stable electrical performance while allowing conformal installation on various surface geometries.
3Reliability
If direct electrical contact between feed line and antenna element is used, then electrical coupling is achieved, but mechanical damage risk increases under mechanical stress
Solution Approach 1:
The patent replaces direct mechanical electrical contact with electric field-based electrical coupling. The feed line and bowtie antenna are coupled through electric fields across the dielectric layer, eliminating mechanical contact points that would be vulnerable to damage from bending, vibration, and other mechanical stresses encountered in UAV operations.
Solution Approach 2:
The patent separates the feed line and antenna element into different spatial layers with vertical separation. This three-dimensional arrangement allows electrical coupling through the dielectric medium while physically isolating the components from mechanical stress, thereby improving mechanical durability without compromising electrical performance.
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 solution provides a lightweight, low-profile antenna with improved aerodynamic efficiency and reduced radar cross-section, maintaining electrical performance even on non-planar surfaces and under mechanical stress, while allowing conformal installation on aircraft.
Implementation Method 1
electrical coupling of the conductive elements comprises electric fields within the dielectric material
Data Source
AI summary
Aspects of the disclosure are directed to an antenna assembly having a first conductive element having a bowtie shape, the first conductive element on a dielectric material at a first layer; a feed point within the bowtie; a second conductive element as a feed line, at a second layer, wherein the second conductive element is electrically coupled to the first conductive element at least at the feed point, independently of direct electrical contact between the first conductive element and the second conductive element; and a ground plane. In some implementations, the second conductive element has no direct electrical contact with the first conductive element, and electrical coupling of the conductive elements comprises electric fields within the dielectric. This reduces the risk of electrical performance degradation caused by mechanical damage at the feed point, such as when the antenna assembly is installed to conform to a non-planar surface.