HF Shunt Antenna Parallel Plate Structure for Composite Aircraft
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Solution Overview
Problem
Current HF shunt antennas face impedance tuning challenges on composite-bodied aircraft due to reduced conductive material and coupling issues, leading to increased reactance and equivalent parallel resistance, which existing COTS HF couplers struggle to address without increasing antenna footprint.
Innovation Solution
A shunt antenna design featuring a current return structure, grounding structure, and a shunt plate structure with multiple parallel plates connected via contact structures, which enhances radiation resistance and reduces equivalent parallel resistance, making it compatible with COTS HF couplers and improving performance without increasing footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length of the HF shunt antenna is increased to improve Rp, then the radiation resistance improves, but the antenna footprint increases unacceptably
Solution Approach 1:
The patent transitions from a traditional linear antenna configuration to a planar shunt plate structure mounted on the vertical stabilizer surface. This dimensional change allows the antenna to achieve improved radiation resistance through increased effective aperture area without requiring an increase in the linear footprint or length of the antenna element.
Solution Approach 2:
The patent changes the geometric parameters of the antenna structure by introducing a shunt plate with specific dimensions, spacing, and orientation relative to the aircraft surface. By optimizing parameters such as plate area, distance from the aircraft skin, and parallel plate separation, the radiation resistance is improved while maintaining a compact footprint.
2Ease of manufacture
If traditional HF shunt antennas are installed on composite-bodied aircraft, then installation is simplified, but coupling between the antenna and aircraft structure is reduced, increasing reactance and equivalent parallel resistance
Solution Approach 1:
The patent introduces a shunt plate structure that acts as an intermediary between the antenna element and the composite aircraft structure. This shunt plate provides an enhanced coupling mechanism that compensates for the reduced conductivity of composite materials, improving the electrical connection without requiring changes to the installation process.
Solution Approach 2:
The patent employs a shunt plate structure that can be constructed from conductive materials or conductive coatings applied to the composite surface. This creates a hybrid structure that maintains the advantages of composite construction while providing the necessary electrical coupling properties.
3Device complexity
If a single shunt plate is used, then the structure is simple, but the equivalent parallel resistance is too high for COTS HF couplers to tune effectively
Solution Approach 1:
The patent divides the shunt structure into multiple parallel plates instead of using a single plate. This segmentation allows for better control of the equivalent parallel resistance by adjusting the number, area, and spacing of individual plates, making the antenna impedance tunable within the range of commercial HF couplers while maintaining relative structural simplicity.
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 allows for improved HF shunt antenna performance on composite-bodied aircraft by reducing equivalent parallel resistance and maintaining radiation efficiency, ensuring compatibility with COTS HF couplers and enhancing performance beyond existing implementations.
Implementation Method 1
the shunt antenna is configured for radiating the Radio Frequency signals
Data Source
AI summary
The present invention is directed to a High Frequency (HF) shunt antenna which promotes improved performance over currently available antenna solutions. The HF shunt antenna may include a shunt plate structure which includes multiple shunt plates configured in a parallel orientation relative to each other and provides an expansive surface area which may promote reduced inductance and lower equivalent parallel resistance of the HF shunt antenna, thereby allowing the HF shunt antenna to be spec-compliant and tunable by a HF coupler, without increasing the footprint of the HF shunt antenna and without reducing radiation efficiency of the antenna.