Circular HF Antenna Array With Placement-Tolerant Compact Gain
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Solution Overview
Problem
Current high frequency (HF) communication and radar detection systems require large, multiple-element antenna arrays that are difficult to relocate and easily detectable, posing challenges in size, mobility, and surveillance.
Innovation Solution
A compact, transportable HF system with a circular array of antenna elements, each with a radiating element less than half the wavelength, allowing for increased gain by adding more elements while maintaining a resilient radiation pattern and tolerating placement errors, and a hub for signal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multiple-element HF antenna arrays are used, then communication performance is maintained, but the system footprint is large and relocation is difficult
Solution Approach 1:
The system divides the antenna array into multiple independent antenna elements that can be individually positioned and configured. Each antenna element operates semi-independently, allowing the overall array to achieve desired communication performance while reducing the physical footprint through strategic placement of smaller, modular components rather than requiring a single large continuous array structure.
Solution Approach 2:
The patent transitions from traditional planar or linear antenna array configurations to a three-dimensional spatial distribution of antenna elements. By utilizing vertical and horizontal positioning in multiple dimensions, the system achieves effective HF communication performance with a more compact overall footprint, as the antenna elements are distributed throughout a 3D space rather than spread out in a single plane.
2Reliability
If traditional large HF antenna arrays are used, then communication performance is maintained, but the system is easily detected by surveillance
Solution Approach 1:
The antenna system is segmented into multiple small, distributed elements rather than a single large array. This segmentation makes the overall system harder to detect and characterize by surveillance, as the individual elements appear as separate, less significant components rather than a recognizable large-scale communication array, while collectively maintaining full communication performance.
Solution Approach 2:
Each antenna element in the distributed array has localized characteristics and positioning, creating a non-uniform spatial distribution. This local variation in element placement, orientation, and configuration disrupts the regular patterns that surveillance systems typically use to identify and characterize traditional HF arrays, making detection and identification more difficult while preserving overall system performance.
3Area of stationary object
If antenna element size is reduced for compactness, then system footprint is reduced, but efficiency at operating frequency decreases
Solution Approach 1:
The system merges the functionality of multiple smaller antenna elements to achieve the collective performance previously requiring single large elements. By combining the radiating capacity of several compact antennas in a coordinated array configuration, the system recovers the total effective radiated power and communication efficiency that would otherwise require much larger individual antenna elements, thus maintaining footprint reduction while compensating for individual element efficiency limitations.
Solution Approach 2:
The antenna array employs dynamic signal processing and beamforming techniques to optimize the combined performance of multiple smaller elements in real-time. Through adaptive control of phase and amplitude across the distributed elements, the system dynamically enhances the effective radiated power in desired directions, compensating for the lower efficiency of individual small elements and achieving overall system efficiency comparable to or exceeding traditional large-element arrays.
Data Source
AI summary
A transportable, resilient, high frequency system with a compact footprint is provided. The system may include a plurality of antenna elements arranged around a circle. A circular array provides a resilient radiation pattern that does not change based on the number of antennas in the array and is tolerant of errors in antenna placement. The gain of the system may be increased by increasing the number of antenna elements in the array to compensate for reduced efficiency of antenna elements having a radiating element with a length of less than half the wavelength of an operating frequency of the array.