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- Aljarosha, Alhassan, 1982, et al.
(författare)
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Performance comparison of silicon substrates for IC-waveguide integration based on a contactless transition at mm-wave frequencies
- 2019
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Ingår i: 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, APSURSI 2019 - Proceedings. ; July 2019, s. 1081-1082
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Konferensbidrag (refereegranskat)abstract
- This paper presents a comparison between different silicon (Si) substrates used in Si-based IC technologies at E-Band (71-86 GHz). A unique low-loss and compact contactless transition from a silicon IC (p-doped substrate) to a metal waveguide is used. The proposed transition incorporates a spatial power combiner to enable direct electromagnetic coupling from an array of patches on the IC to a metal waveguide. This design enables a high-power transition from an IC to a waveguide and/or antenna at millimeter-wave (mm-wave) frequencies, where a galvanic contact between the two parts is avoided.
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- Aljarosha, Alhassan, 1982, et al.
(författare)
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Toward Wide-Band Low-Loss Gap-Waveguide-Integrated Grid Amplifiers
- 2017
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Ingår i: 2017 International Symposium on Antennas and Propagation (ISAP). - 9781538604656
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Konferensbidrag (refereegranskat)abstract
- A passive W-band 19-channel spatial power splitter/combiner is presented, for the applications in grid amplifiers design. The design employs a linear array of chip-to-air-filled waveguide contactless connections, and are directly integrated within a single-layer. The meta-material-based gap waveguide is used; it enables a low-loss low-profile solution. The quasi optical beamformer gives rise to a parallel-plate planar waveguide field which excites an array of contactless chip-to-waveguide transitions via step-tapered ridge gap waveguides. The other beamformer restores the field distribution (after amplification) and excites a wave going towards the waveguide output. Furthermore, the gap waveguide technology isolates the amplifiers from one another and provides a packaging solution in a single unit. The simulated return loss of the back-to-back structure is larger than 12 dB, while the insertion loss is smaller than 1.2 dB over the entire W-band (75-110 GHz).
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- Amani, Navid, 1985, et al.
(författare)
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Towards a Generic Model for MU-MIMO Analysis Including Mutual Coupling and Multipath Effects
- 2019
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Ingår i: 13th European Conference on Antennas and Propagation, EuCAP 2019. ; 2019
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Konferensbidrag (refereegranskat)abstract
- A network model which accounts for antenna mutual coupling and multipath effects in a wireless channel is proposed as a tool to qualitatively evaluate the performance of a multi-user multiple-input multiple-output (MU-MIMO) system. The system performance is assessed when a zero-forcing (ZF) beamformed conventional uniform linear array (ULA) and a sparse array are employed as one sector of a base station antenna (BSA) in a single-cell network. It is shown that highly correlated user equipments (UEs) in a line-of-sight (LOS) scenario can be decorrelated to some extents, by a scattering environment in a non-line-of-sight (NLOS) scenario. This occurs due to increase of the spatial variation by a multipath effect. Furthermore, in both environments a sparse array realized by an increased interelement spacing is also capable for correlation reduction among users due to the narrower beams.
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- Kaul, Piyush, et al.
(författare)
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An E-band silicon-ic-to-waveguide contactless transition incorporating a low-loss spatial power combiner
- 2018
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Ingår i: Asia-Pacific Microwave Conference Proceedings, APMC. - 9784902339451 ; 2018-November, s. 1528-1530
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Konferensbidrag (refereegranskat)abstract
- A novel contactless transition from a (Bi)CMOS Silicon IC (p-doped substrate) to a metal waveguide in E-Band is presented. This transition also incorporates a spatial power combiner in air to enable direct electromagnetic coupling from an array of on-chip microstrip transmission lines to a single waveguide mode, and vice versa. The transition is relatively low loss and is particularly suitable for high-power mm-wave applications. The simulated return loss of a four-channel passive back-to-back transition is better than 10 dB over the frequency band ranging from 60-90 GHz (E-Band). The average insertion loss of a single transition is 1.31 dB over the entire E-Band.
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- Smolders, Simon, et al.
(författare)
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A Titanium(IV)-Based Metal-Organic Framework Featuring Defect-Rich Ti-O Sheets as an Oxidative Desulfurization Catalyst
- 2019
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Ingår i: Angewandte Chemie International Edition. - : Wiley. - 1433-7851 .- 1521-3773. ; 58:27, s. 9160-9165
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Tidskriftsartikel (refereegranskat)abstract
- While titanium-based metal-organic frameworks (MOFs) have been widely studied for their (photo) catalytic potential, only a few Ti-IV MOFs have been reported owing to the high reactivity of the employed titanium precursors. The synthesis of COK-47 is now presented, the first Ti carboxylate MOF based on sheets of (TiO6)-O-IV octahedra, which can be synthesized with a range of different linkers. COK-47 can be synthesized as an inherently defective nanoparticulate material, rendering it a highly efficient catalyst for the oxidation of thiophenes. Its structure was determined by continuous rotation electron diffraction and studied in depth by X-ray total scattering, EXAFS, and solid-state NMR. Furthermore, its photoactivity was investigated by electron paramagnetic resonance and demonstrated by catalytic photodegradation of rhodamine 6G.
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