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| 2. |
- Rahiminejad, Sofia, 1987, et al.
(författare)
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Micromachined Ridge Gap Waveguide and Resonator for Millimeter-Wave Applications
- 2012
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Ingår i: Sensors and Actuators, A: Physical. - : Elsevier BV. - 0924-4247 .- 1873-3069. ; 186, s. 264-269
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Tidskriftsartikel (refereegranskat)abstract
- The ridge gap waveguide is a fundamentally new high-frequency waveguide. It does not need any electrical contact between the split blocks which gives it an advantage compared to the rectangular waveguide which is the standard today. These waveguides are conventionally fabricated by milling, although above 100 GHz milling is not adequate anymore. MEMS technology on the other hand, can offer high-precision fabrication and thus opens the path for new types of high-frequency components. In this paper both a ridge gap waveguide and a ridge gap resonator have been fabricated for the frequencies 220–325 GHz using MEMS technology. Support packages have been designed to enable device measurements. Simulations show that the reflection coefficient for the ridge gap waveguide is below −15 dB between 240 and 340 GHz. Two resonance peaks were measured at the frequencies 234 GHz and 284 GHz for the ridge gap resonator with unloaded Q-values of 336 and 527 respectively. Both the waveguide and resonator have the potential to obtain similar performances as the rectangular waveguide without strict requirement on electrical contact, allowing simplified fabrication and assembly technique.
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| 3. |
- Vyas, Agin, 1992, et al.
(författare)
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A micromachined coupled-cantilever for piezoelectric energy harvesters
- 2018
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Ingår i: Micromachines. - : MDPI AG. - 2072-666X. ; 9:5
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a demonstration of the feasibility of fabricating micro-cantilever harvesters with extended stress distribution and enhanced bandwidth by exploiting an M-shaped two-degrees-of-freedom design. The measured mechanical response of the fabricated device displays the predicted dual resonance peak behavior with the fundamental peak at the intended frequency. This design has the features of high energy conversion efficiency in a miniaturized environment where the available vibrational energy varies in frequency. It makes such a design suitable for future large volume production of integrated self powered sensors nodes for the Internet-of-Things
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| 4. |
- Farjana, Sadia, 1983, et al.
(författare)
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Polymer based 140 GHz Planar Gap Waveguide Array Antenna for Line of Sight (LOS) MIMO Backhaul Links
- 2019
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Ingår i: IMWS-AMP 2019 - 2019 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications. - : Institute of Electrical and Electronics Engineers Inc.. - 9781728109350 ; July 2918, s. 148-150
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Konferensbidrag (refereegranskat)abstract
- This paper presents the micromachining based fabrication process of a 140 GHz planar antenna array based on gap waveguide technology to be used in next generation backhauling links. Each antenna element in the bigger 3D-array to be used in LOS MIMO configuration designed to have about 30dBi gain. Each antenna element in the big array consists of several metal layers such as the cavity backed radiation layer and a corporate feed network layer. In this work, we focus on the single antenna array element. Considering some fabrication difficulties as well as focusing on batch fabrication, three different micromachine techniques, SU8 fabrication, PDMS molding and injection molding of polymer OSTEMER has been utilized to fabricate the single antenna device.
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| 5. |
- Farjana, Sadia, 1983, et al.
(författare)
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Realizing a 140 GHz Gap Waveguide–Based Array Antenna by Low-Cost Injection Molding and Micromachining
- 2021
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Ingår i: Journal of Infrared, Millimeter and Terahertz Waves. - : Springer. - 1866-6892 .- 1866-6906. ; 42:8, s. 893-914
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a novel micromachining process to fabricate a 140 GHz planar antenna based on gap waveguide technology to be used in the next-generation backhauling links. The 140 GHz planar array antenna consists of three layers, all of which have been fabricated using polymer-based microfabrication and injection molding. The 140 GHz antenna has the potential to be used as an element in a bigger 3D array in a line-of-sight (LOS) multiple input multiple output (MIMO) configuration to boost the network capacity. In this work, we focus on the fabrication of a single antenna array element based on gap waveguide technology. Depending on the complexity of each antenna layer’s design, three different micromachining techniques, SU8 fabrication, polydimethylsiloxane (PDMS) molding, and injection molding of the polymer (OSTEMER), together with gold (Au) coating, have been utilized to fabricate a single 140 GHz planar array antenna. The input reflection coefficient was measured to be below − 11 dB over a 14% bandwidth from 132 to 152 GHz, and the antenna gain was measured to be 31 dBi at 140 GHz, both of which are in good agreement with the simulations. © 2021, The Author(s).
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| 7. |
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| 8. |
- 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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