Helical Antenna Array Conductive Loading for Gain
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Solution Overview
Problem
Conventional helical antenna arrays face limitations in gain, structural efficiency, and spatial constraints, particularly in aircraft communications where spatial limitations restrict the size and scanning volume of the antenna array, leading to reduced performance and increased dissipative losses due to electromagnetic coupling and inefficient use of volume.
Innovation Solution
The design incorporates a ground plane with laterally displaced conductive loading elements and apertures, along with capacitive loading on the helical antenna elements, to enhance the effective aperture and reduce mutual coupling, allowing for increased gain and reduced dissipative losses while maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the antenna array size is increased to achieve higher gain, then the gain improves, but the spatial volume and structural complexity increase
Solution Approach 1:
The patent applies parameter changes by introducing conductive loading elements with specific geometries (plates, rings, or other shapes) at the terminal ends of helical antenna elements. These loading elements have lateral dimensions and are positioned at predetermined distances from the helix terminals, changing the electrical parameters (capacitance, impedance) of the antenna elements. This allows achieving higher gain (20-30 dBi) with a compact array structure by optimizing the loading element parameters rather than simply increasing array size.
Solution Approach 2:
The patent implements local quality by placing conductive loading elements selectively at the terminal ends of specific helical antenna elements where the loading is most effective. The loading elements are positioned at predetermined distances from the helix terminals and have specific lateral dimensions, creating localized electrical property enhancements. This targeted approach optimizes gain improvement while minimizing the overall volume increase, as only specific locations in the antenna structure are modified rather than the entire array.
2Power
If the helical antenna elements are made longer to increase gain, then the gain improves, but the structural volume and dissipative losses increase
Solution Approach 1:
The patent changes the electrical parameters of the antenna elements by introducing conductive loading elements with specific capacitance values and geometries. These loading elements modify the impedance characteristics and resonant frequencies of the helical elements, allowing for optimized current distribution and reduced resistive losses. The loading elements enable achieving higher gain with moderate-length helices by improving the efficiency of energy radiation rather than simply increasing element length.
Solution Approach 2:
The patent converts the potentially harmful effect of mutual coupling and energy dissipation into a benefit by strategically placing conductive loading elements. These loading elements, while adding structural complexity, create capacitive effects that improve current distribution and reduce dissipative losses. The loading elements transform the problem of energy loss in compact structures into an opportunity to optimize electrical performance through controlled capacitance and impedance matching.
3Volume of stationary object
If the antenna array is made more compact to reduce spatial constraints, then the spatial volume decreases, but the gain and scanning performance deteriorate
Solution Approach 1:
The patent achieves compact antenna array design by changing the electrical parameters through conductive loading elements. The loading elements with specific lateral dimensions and positions create electrical lengthening effects and impedance transformations that allow compact physical structures to achieve the electrical performance of larger arrays. This enables maintaining high gain (20-30 dBi) in reduced spatial volumes by optimizing the electrical characteristics rather than increasing physical dimensions.
4Device complexity
If conventional helical antenna elements are used without loading, then the structure is simpler, but the gain and impedance matching performance are suboptimal
Solution Approach 1:
The patent improves gain and impedance matching by introducing conductive loading elements with optimized geometries and positions. The loading elements change the electrical parameters (capacitance, impedance) of the antenna elements, enabling better impedance matching to standard coaxial cables and improving radiative efficiency. While this adds structural complexity, the loading elements can be implemented as simple plates, rings, or other geometric shapes that are relatively easy to manufacture and integrate.
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 configuration improves the overall gain and reduces dissipative losses, enabling higher performance and spatial flexibility in antenna arrays, particularly in aircraft communications, by maintaining a compact structure and allowing for efficient scanning without increasing the antenna's size.
Implementation Method 1
conductive members attached to the helical winding as a means of increasing capacitance and thus facilitating impedance matching
Implementation Method 2
the ground plane can further reflect that part of the electromagnetic wave generated by the antenna elements that propagates in the rearward direction, i.e. the ground plane effectively re-directs this radiation forwards
Implementation Method 3
a conductor, such as a wire, tape, moulded conductor, stamped conductor, extrusion, or printed circuit, having a nominally helical geometry that, when energized, generates a circularly or substantially circularly polarized beam
Data Source
AI summary
The present invention provides a high-performance helical antenna element and array thereof for use in an aircraft communication system or the like, where stringent spatial restrictions and gain requirements generally apply. The performance of the array is enhanced by connecting conductive plates to the windings of the antenna elements at the terminal ends thereof such that the conductive plates are offset from the axes of the antenna elements and toward the center of the array.