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Resonant Frequency Response to Mechanical Loading in Conformal Load-Bearing Antenna Systems
Shouxun Lu1, Kelvin J Nicholson2, Joel Patniotis2
1Department of Mechanical & Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia.
Sensors (Basel, Switzerland)
|March 17, 2025
Summary
Mechanical loading impacts conformal load-bearing antenna structures (CLASs). Damage increases substrate permittivity, decreasing resonant frequency, especially under tensile stress. This affects CLAS reliability and service life prediction.
Area of Science:
- Electromagnetics
- Materials Science
- Structural Mechanics
Background:
- Conformal load-bearing antenna structures (CLASs) integrate antennas into structural components.
- Understanding the impact of mechanical stress on antenna performance is crucial for reliability.
Purpose of the Study:
- To investigate how mechanical loading affects the electromagnetic resonant frequency of CLASs.
- To differentiate the effects of quasi-static tensile loading and cyclic fatigue on CLAS performance.
Main Methods:
- Utilized 6-ply [0/90] glass fiber reinforced polymer (GFRP) as the CLAS substrate.
- Conducted quasi-static uniaxial tensile tests and cyclic fatigue tests.
- Employed removeable antenna patch (RAP) and surface-mounted antenna patch (SMAP) configurations.
Main Results:
- Quasi-static tensile loading increased substrate permittivity due to damage, decreasing resonant frequency.
- Cyclic fatigue showed a consistent damage-frequency correlation in RAP configuration.
- SMAP configuration exhibited complex frequency shifts due to combined damage and elongation effects.
- Ply configuration influenced resonant frequency under significant quasi-static elongation.
Conclusions:
- Substrate permittivity changes driven by mechanical loading are key to resonant frequency shifts in CLASs.
- Findings are critical for predicting the reliability and service life of load-bearing antenna systems.
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