Compact Volumetric Antenna Reactance Reduction
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Solution Overview
Problem
Conventional antennas face challenges in achieving wide bandwidth while occupying a small volume, maintaining efficient performance, and being cost-effective, particularly in applications requiring stealth and compact designs such as military communications and high-frequency operations.
Innovation Solution
The development of a compact volumetric antenna with a geometric configuration that includes electrically conductive components extending from poles, generating additional magnetic fields to lower total reactance, thereby enhancing bandwidth and performance, allowing for miniaturization without compromising efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to fit in small space, then the volume is reduced, but the bandwidth drastically decreases from 10-12% to 0.1% and less
Solution Approach 1:
The patent transitions from planar/linear antenna structures to a volumetric configuration. The antenna occupies a three-dimensional space with conductive elements arranged in a volumetric pattern, allowing it to achieve wide bandwidth while maintaining electrically small dimensions. This dimensional change enables the antenna to resonate at the fundamental mode with bandwidth exceeding 100% while occupying minimal volume.
Solution Approach 2:
The patent employs a composite structure combining multiple conductive elements (first and second conductive elements) with different orientations and configurations within a single antenna system. This composite arrangement creates multiple resonant paths and impedance characteristics that collectively provide wide bandwidth operation, transforming the antenna from a simple dipole to a multi-element volumetric structure with superior performance.
2Volume of moving object
If the antenna is made electrically small for stealth requirements, then the size is reduced, but the radiation resistance becomes very low and capacitive reactance becomes high, making the antenna inefficient
Solution Approach 1:
By moving to a volumetric configuration, the antenna increases its effective electrical size in three dimensions while maintaining compact physical dimensions. The volumetric arrangement of conductive elements creates multiple current paths and resonant modes that increase radiation resistance and reduce capacitive reactance, thereby improving radiation efficiency without compromising the electrically small property.
Solution Approach 2:
The composite structure of multiple conductive elements working together creates a synergistic effect where the combined radiation resistance is significantly higher than individual elements. This composite approach allows the antenna to maintain low profile and compact size while achieving efficient radiation through constructive interference and multiple resonant pathways.
3Ease of manufacture
If conventional dipole antenna geometry is used, then the manufacturing is simple, but the bandwidth is limited to 10-12% and size cannot be reduced without losing performance
Solution Approach 1:
The patent extends the conventional dipole from a one-dimensional linear structure to a three-dimensional volumetric configuration. This dimensional evolution maintains manufacturing simplicity by using basic conductive elements and standard assembly techniques, while the volumetric arrangement fundamentally transforms the antenna's resonant characteristics to achieve bandwidth exceeding 100%.
Solution Approach 2:
The antenna is segmented into multiple conductive elements (first and second conductive elements) with specific orientations and spacing. This segmentation allows each element to contribute to different aspects of the radiation pattern and impedance characteristics, collectively achieving wide bandwidth while maintaining ease of manufacture through modular construction.
4Volume of moving object
If helical antenna is used for reduced size, then the volume is reduced, but the impedance behavior becomes erratic at low frequencies and radiation efficiency is poor
Solution Approach 1:
The patent replaces the helical three-dimensional winding structure with a volumetric dipole configuration that achieves size reduction through a different geometric principle. This volumetric arrangement provides stable and predictable impedance characteristics across the operating bandwidth, eliminating the erratic impedance behavior associated with compact helical antennas while maintaining reduced volume.
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 achieves a wider bandwidth and more stable pattern than traditional dipole antennas, enabling efficient use of space and improved performance across various frequency bands, including HF and VHF, while maintaining a smaller size and lower manufacturing costs.
Implementation Method 1
The electrically conductive element can include a surface having a portion electrically connected to, and extending from, the first pole or the second pole. The electrically conductive element is capable of conducting a current that generates a magnetic field that lowers a total reactance of the antenna.
Data Source
AI summary
A wide-bandwidth antenna (e.g., a rib-dipole antenna) includes a first pole formed by a first conductive member and/or a second pole formed by a second conductive member. The antenna also includes an antenna feed between the first conductive member and the second conductive member. The antenna also includes at least one electrically conductive element including a surface. A portion of the surface is electrically connected to, and extends from, the first conductive member or the second conductive member. The at least one electrically conductive element is capable of conducting a current that generates a magnetic field. The magnetic field lowers a total reactance of the antenna, thereby resulting in enhanced performance of the antenna and more efficient use of volume.