Multifunctional Composite Structures

Kumar, Ashok

doi:10.21236/ada521792

2010

DOI: 10.21236/ada521792

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Multifunctional Composite Structures

Ashok Kumar¹

Abstract: This report is published in the interest of scientific and technical information exchange, and its publication does not constitute the Government's approval or disapproval of its ideas or findings.

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Cited by 2 publications

References 70 publications

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Investigations of a Load-Bearing Composite Electrically Small Egyptian Axe Dipole Antenna

Baum¹,

Ziolkowski

Ghorbani³

et al. 2017

IEEE Trans. Antennas Propagat.

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An electrically small, metamaterial-inspired Egyptian Axe Dipole (EAD) antenna has been investigated for use in structural composite materials. The EAD antenna consists of a differentially-fed dipole element integrated with a near-field resonant parasitic (NFRP) EAD element. These elements have been adapted to these materials resulting in a system that is impedance matched and radiates efficiently at 307 MHz. Three cases have been identified and investigated to ascertain the performance of the manufacturing techniques and material properties used to build these electrically small antennas (ESAs), as well as their performance characteristics. Uniquely, an embroidered conductive thread and a new carbon fiber based, non-woven mat have been investigated for use as the conducting elements. Both cases are compared with a copper variant of the EAD antenna. All three prototypes were tested. Measurements confirm that both the non-woven mat and the embroidered versions of the EAD antennas perform similarly, with maximum realized gains ranging from 1.72 -1.90 dBi.

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Investigations of a Load-Bearing Composite Electrically Small Egyptian Axe Dipole Antenna

Baum¹,

Ziolkowski

Ghorbani³

et al. 2017

IEEE Trans. Antennas Propagat.

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Tomographic Characterization of a Multifunctional Composite High-Impedance Surface

Nicholson

Baum

Ziolkowski

et al. 2018

IEEE Trans. Microwave Theory Techn.

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The performance of a multi-functional composite high impedance surface (HIS) has been evaluated using the coherent Doppler tomography (CDT) and finite impulse response (FIR) filtering techniques. The HIS was fabricated using a combination of embroidery and advanced laser manufacturing processes. The result is a new conformable multi-functional glass fiber re-enforced polymer (GFRP) substrate suitable for structural load-bearing smart skin applications. The CDT method was utilized because it enabled the generation of a high resolution tomographic map of the HIS reflectivity. Tomograms generated at high incidence angles (> 80° from normal) were used to localize and FIR filter unwanted scattering associated with the ground plane edges and HIS transition regions. The resulting scattered fields from a defect (metallic block positioned in the center of the tomogram) were then used to assess the surface wave absorption within the HIS. Measured and simulated results are in excellent agreement.

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Multifunctional Composite Structures

Abstract: This report is published in the interest of scientific and technical information exchange, and its publication does not constitute the Government's approval or disapproval of its ideas or findings.

Cited by 2 publications

References 70 publications

Investigations of a Load-Bearing Composite Electrically Small Egyptian Axe Dipole Antenna

Investigations of a Load-Bearing Composite Electrically Small Egyptian Axe Dipole Antenna

Tomographic Characterization of a Multifunctional Composite High-Impedance Surface

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