The Role of Fibre Orientation on the Electromagnetic Performance of Waveguides Manufactured From Carbon Fibre Reinforced Plastic

Bojovschi, A.; Nicholson, Kelvin J.; Galehdar, Amir; Callus, Paul J.; Ghorbani, Kamran

doi:10.2528/pierb12011110

Cited by 19 publications

(17 citation statements)

References 8 publications

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“…There was excellent agreement between the simulated and measured S-parameters for the copper waveguide. The difference in S-parameters between the CFRP and copper waveguides are due to the insertion loss in the CFRP which is well described in [8,[18][19][20]. This resulted in the |S 21 | for the spiral shaped SWA in CFRP to be approximately 1 dB lower than that in the metallic waveguide throughout the band.…”

Section: Experimental Validationmentioning

confidence: 94%

A Spiral Shaped Slot as a Broad-Band Slotted Waveguide Antenna

Daliri¹,

Galehdar²,

Rowe³

et al. 2013

PIER

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Abstract-The utility of slotted waveguide antennas would be maximized if the bandwidth of the radiating elements matched that available in the waveguide. This was achieved using a spiral shaped slot cut through the broad-wall of a rectangular waveguide. The predicted total efficiency and peak realized gain were relatively uniform across the entire bandwidth. The current distribution around the slot was predicted to be similar to that around a conventional, center fed, slot spiral antenna, indicating similarity of radiation mechanisms. Finally, the antenna patterns for spiral shaped slots in waveguides manufactured from copper and carbon fibre reinforced polymer (CFRP) were shown to be similar to that predicted.

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Section: Experimental Validationmentioning

confidence: 94%

A Spiral Shaped Slot as a Broad-Band Slotted Waveguide Antenna

Daliri¹,

Galehdar²,

Rowe³

et al. 2013

PIER

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“…Several groups have been working on characterization of composite materials [7,[12][13][14]. For this study the properties of Cytec IM7/977-3 aerospace-grade prepreg tape has been used.…”

Section: Cfrp Properties and Design Considerationsmentioning

confidence: 99%

“…For this study the properties of Cytec IM7/977-3 aerospace-grade prepreg tape has been used. The conductivity of this CFRP was measured using surface impedance method and calculated to be 30,000 S/m in the direction of the fibers in the X-band [14]. In the direction perpendicular to the fibers the CFRP can be considered as a lossy dielectric with complex permittivity of r = 30 -7.4j in the X-band [7].…”

Section: Cfrp Properties and Design Considerationsmentioning

confidence: 99%

Integration of RF transmission lines in carbon fiber reinforced polymer (CFRP) structures

Ghorbani

Daliri

2013

2013 Asia-Pacific Microwave Conference Proceedings (APMC)

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Multifunctional structures are essential parts of future air vehicles to reduce the weight and add extra capabilities. Recently, integration of various elements in the carbon fiber reinforce polymer (CFRP) panel has been the center of attention among RF and structural engineers. This paper investigates the feasibility of integrating RF transmission lines in CFRP skins. The effect of CFRP conductivity on the performance of common RF transmission lines has been studied. The results of this study suggest coaxial line with CFRP as the outer conductor is the most suitable type of transmission line for this purpose and its insertion loss is about 0.7 dB/m, which is reasonable for UHF-Satcom.

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“…9. A metallic test fixture was used to validate the design in the absence of the complex CFRP conductivity [12]. The MGV-125-08-0805 varactor manufactured by Aeroflex Metelics was used to implement and .…”

Section: Measurement Of Crlh-tl and Slot Antennamentioning

confidence: 99%

Coaxial Right/Left-Handed Transmission Line for Electronic Beam Steering in the Slotted Waveguide Antenna Stiffened Structure

Nicholson

Rowe

Callus

et al. 2014

IEEE Trans. Microwave Theory Techn.

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Abstract-The slotted waveguide antenna stiffened structure (SWASS) utilizes conventional hat-stiffeners or blade stiffeners in aircraft sandwich structures as microwave waveguides. Slotted waveguide antenna arrays may therefore be integrated into the structure by machining slots through the outer skin. However, the primary mechanical load applied to the structure governs the orientation of these slotted waveguides and so dictates the antenna scan plane. This work extends the SWASS concept by demonstrating a means to achieve electronic phase shifting along the waveguide axis for the purpose of beam steering. This is accomplished by incorporating a varactor loaded coaxial composite right/left-handed transmission line into the SWASS for approximate matched tuning of the dispersion diagram about the design frequency.Index Terms-Coaxial, composite material structures, metamaterial, phase shifters, waveguide slot arrays.

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The Role of Fibre Orientation on the Electromagnetic Performance of Waveguides Manufactured From Carbon Fibre Reinforced Plastic

Cited by 19 publications

References 8 publications

A Spiral Shaped Slot as a Broad-Band Slotted Waveguide Antenna

A Spiral Shaped Slot as a Broad-Band Slotted Waveguide Antenna

Integration of RF transmission lines in carbon fiber reinforced polymer (CFRP) structures

Coaxial Right/Left-Handed Transmission Line for Electronic Beam Steering in the Slotted Waveguide Antenna Stiffened Structure

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