| 1. |
- Agten, Dries, et al.
(författare)
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Modeling of a scalable coupled resonator array for microshutter applications
- 2011
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Ingår i: MME 22, Micromechanics and Micro systems Europe Workshop, June 19-22, 2011, Toensberg, Norway. - 9788278602249 ; , s. 154-157
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Konferensbidrag (refereegranskat)abstract
- In this paper we present the resultsfrom the finite element analysis of a scalablecoupled resonator array for ultrafast microshutterapplications. This new design concept builds on thedesign of a previous microshutter array, but couplesthe shutters to each other to allow them to move in acoupled antiphase resonance mode. Simulations forarray scalability show that the resonance frequencydoes not change significantly when adding rowsor columns to the array. The desired resonancemode stays present during scaling. Analyzingthe sensitivity to changing dimensions results inslightly different amplitudes but no change inphase difference between adjacent shutters at theresonance frequency.
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| 2. |
- Ahmed, S, 1970, et al.
(författare)
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Fractal-based dual-band small antenna for 2.45 and 5.8 GHz
- 2010
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Ingår i: 21st Micromechanics and Micro systems Europe workshop, 26-29 September 2010, Enschede, The Netherlands. ; , s. 108-111
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Konferensbidrag (refereegranskat)abstract
- Small antennas are becoming important andrequired for many domestic and commercial wireless applications.New design and first experimental results confirmingthe simulations of multi-band patch antenna optimized for the2.45 GHz and 5.8 GHz bands are presented. This design isbased on the practical considerations found for our Minkowski-based fractal antenna that predict the influence ofgeometry modifications on the frequency of operation.
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| 3. |
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| 4. |
- Alavian Ghavanini, Farzan, 1978, et al.
(författare)
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A method to evaluate MEMS bonding
- 2006
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Ingår i: Micro Structure Workshop 2006. ; 1:1, s. 47-B3d
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Konferensbidrag (refereegranskat)
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| 5. |
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| 6. |
- Alavian Ghavanini, Farzan, 1978, et al.
(författare)
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Direct Measurement of the Bending Stiffness of Individual Vertically Aligned Carbon Nanofibers (VACNFs)
- 2011
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Ingår i: NT11 International Conference on the Science and Application of Nanotubes University of Cambridge, Cambridge, 10 – 16 July, 2011.
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Konferensbidrag (refereegranskat)abstract
- Vertically aligned carbon nanofibers (VACNFs) are synthesized in a plasma-enhanced chemical vapor deposition process (PECVD) in which the position, diameter, length, and alignment of individual nanofibers can be controlled accurately. This has provided an unprecedented opportunity to realize a new bottom-up-engineered material with excellent mechanical and electrical properties which could exploit the third dimension at a reasonable cost. VACNFs have been already employed in a number of applications including electron emitters, gene delivery arrays, and nanoelectromechanical systems. However, no direct measurement of the Young’s modulus of VACNFs has been reported yet. Qi et al. have used nanoindentation method to measure the collective response of a forest of VACNFs with a distribution in length and diameter of the constituent nanofibers. Kaul et al., have reported in situ uniaxial compression tests on individual VACNFs but they have not provided enough information to evaluate the accuracy of their measurements. Indirect estimation of the VACNFs Young’s modulus has also been reported by Eriksson et al. from measurements of the resonance frequency of a nanofiber deposited on top of an excitation electrode. Here, we report on direct measurements of VACNFs Young’s modulus using a piezoresistive atomic force microscope (AFM) cantilever implemented inside a scanning electron microscope (SEM). The VACNFs were grown from Ni catalyst seeds, patterned using electron-beam lithography on top of a stoichiometric TiN underlayer. The VACNFs were grown in a commercially available PECVD chamber (AIXTRON BlackMagic™). The nanofibers were approached from the side and pushed at the tip (resembling a cantilever beam) and force-deflection curves were obtained. By calibrating the AFM sensor the bending stiffness of the nanofiber could be determined. The Young’s modulus was then estimated by taking the nanofibers dimensions into account. The sub-nano Newton force precision provided by the AFM force-sensor together with the fact the individual VACNFs could be observed in the SEM simultaneously during the measurements, has enabled us to measure the nanofibers Young’s modulus with a high precision. Preliminary measurements indicate that VACNFs posses a Young’s modulus between 40 to 100 GPa which is comparable to CVD grown carbon nanotubes of similar diameter.
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| 7. |
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| 8. |
- Amin, Muhammad, 1979, et al.
(författare)
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A Carbon nanotubes ridge gap resonator
- 2013
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Ingår i: MEMSWAVE 2013, July 1-3, 2013, Potsdam GERMANY.
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Konferensbidrag (refereegranskat)abstract
- The extra ordinary electronic properties of carbon nanotubes have made them a highly attractive material for applications like interconnects and microwave electronics. Their quick fabrication process has given them further advantage to be chosen as a first material for these applications. In this paper we present a novel process to fabricate a microwave device using carbon nanotubes not as the main active part but as a core material coated with a 1 μm aluminum layer. A carbon nanotube based ridge gap resonator was fabricated and demonstrated for the first time for the frequency range 200-325GHz. The process is not limited to these frequencies and enables the fabrication of gap wave based device using carbon nanotubes as core for a wide range of frequencies and applications.
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| 9. |
- Amin, Muhammad, 1979, et al.
(författare)
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Carbon nanotubes as base material for fabrication of gap waveguide components
- 2014
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Ingår i: Procedia Engineering. - : Elsevier BV. - 1877-7058 .- 1877-7058. ; 87, s. 931-934
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Konferensbidrag (refereegranskat)abstract
- Carbon nanotubes are being used here as a base material for rapid prototyping of a high frequency device. It has beenimplemented on a ridge gap resonator for 220-325 GHz which has previously been fabricated in Si. Microfabrication with Si has its benefits but it is time consuming when etching high ratio structures. CNT based structures offer a rapid and low cost turnover for prototyping. Measurements comparing the CNT-based structure to a previously made Si structure and simulations are presented. The unloaded Q-values and the loss/mm are presented from simulations, Si-based resonator measurements and CNT-based resonator measurements.
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| 10. |
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