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Träfflista för sökning "WFRF:(Vassilev Vessen 1969) "

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  • Güsten, R., et al. (författare)
  • APEX: the Atacama Pathfinder EXperiment
  • 2006
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - 0277-786X .- 1996-756X. ; 6267
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • APEX, the Atacama Pathfinder Experiment, has been successfully commissioned and is in operation now. This novel submillimeter telescope is located at 5107 m altitude on Llano de Chajnantor in the Chilean High Andes, on what is considered one of the world's outstanding sites for submillimeter astronomy. The primary reflector with 12 m diameter has been carefully adjusted by means of holography. Its surface smoothness of 17-18 mu m makes APEX suitable for observations up to 200 mu m, through all atmospheric submm windows accessible from the ground.
  • Hassona, Ahmed Adel, 1988, et al. (författare)
  • A Non-galvanic D-band MMIC-to-Waveguide Transition Using eWLB Packaging Technology
  • 2017
  • Ingår i: IEEE MTT-S International Microwave Symposium Digest. - : Institute of Electrical and Electronics Engineers (IEEE). - 0149-645X. - 9781509063604 ; , s. 510-512
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents a novel D-band interconnect implemented in a low-cost embedded Wafer Level Ball Grid Array (eWLB) commercial process. The non-galvanic transition is realized through a slot antenna directly radiating to a standard air filled waveguide. The interconnect achieves low insertion loss and relatively wide bandwidth. The measured average insertion loss is 3 dB across a bandwidth of 22% covering the frequency range 110-138 GHz. The measured average return loss is -10 dB across the same frequency range. Adopting the low-cost eWLB process and standard waveguides makes the transition an attractive solution for interconnects beyond 100 GHz. This solution enables mm-wave system on chip (SoC) to be manufactured and assembled in high volumes cost effectively. To the authors’ knowledge, this is first attempt to fabricate a packaging solution beyond 100 GHz using eWLB technology.
  • Rahiminejad, S., et al. (författare)
  • Design of micromachined ridge gap waveguides for millimeter-wave applications
  • 2011
  • Ingår i: Procedia Eng.. ; 25, s. 519-522
  • Konferensbidrag (refereegranskat)abstract
    • The ridge gap waveguide is a new transmission line for millimeter-wave applications. Traditionally, rectangular waveguides are used for those applications due to their low loss. However their fabrication requires precision machining, very good electrical contact and alignment between two joining mechanical parts. Ridge gap waveguides can obtain similar performance without requiring conductive sidewalls and this provides more freedom during the fabrication and assembly process as the structure is no longer sensitive to small gaps between the side walls and the upper lid. The ridge gap waveguide has already been validated for 10-20 GHz using conventional fabrication methods. The ridge gap waveguide prototypes presented in this paper are designed to work in the frequency region between 210 and 340 GHz, and fabricated using MEMS technology. MEMS technology provides fabrication precision of the structures and thus opens the path for high-frequency components.
  • Rahiminejad, Sofia, 1987, et al. (författare)
  • Micromachined Ridge Gap Waveguide and Resonator for Millimeter-Wave Applications
  • 2012
  • Ingår i: Sensors and Actuators, A: Physical. - 0924-4247 .- 1873-3069. ; 186:Special Issue: SI, s. 264-269
  • 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.
  • Alexander, N., et al. (författare)
  • IMAGINE project - A low cost, high performance, monolithic passive mm-wave imager front-end
  • 2012
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - 0277-786X .- 1996-756X. ; 8544
  • Konferensbidrag (refereegranskat)abstract
    • The FP7 Research for SME project IMAGINE - a low cost, high performance monolithic passive mm-wave imager front-end is described in this paper. The main innovation areas for the project are: i) the development of a 94 GHz radiometer chipset and matching circuits suitable for monolithic integration. The chipset consists of a W-band low noise amplifier, fabricated using the commercially available OMMIC D007IH GaAs mHEMT process, and a zero bias resonant interband tunneling diode, fabricated using a patented epi-layer structure that is lattice matched to the same D007IH process; ii) the development of a 94 GHz antenna adapted for low cost manufacturing methods with performance suitable for real-time imaging; iii) the development of a low cost liquid crystal polymer PCB build-up technology with performance suitable for the integration and assembly of a 94 GHz radiometer module; iv) the assembly of technology demonstrator modules. The results achieved in these areas are presented.
  • Algaba Brazalez, Astrid, 1983, et al. (författare)
  • Design of F-Band Transition From Microstrip to Ridge Gap Waveguide Including Monte Carlo Assembly Tolerance Analysis
  • 2016
  • Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480. ; 64:4, s. 1245-1254
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper describes the design and realization of a transition from a microstrip line to a ridge gap waveguide operating between 95 and 115 GHz. The study includes simulations, measurements, and a Monte Carlo analysis of the assembly tolerances. The purpose of this tolerance study is to identify the most critical misalignments that affect the circuit performance and to provide guidelines about the assembly tolerance requirements for the proposed transition design.
  • Belitsky, Victor, 1955, et al. (författare)
  • Superconducting microstrip line models at millimeter and sub-millimeter waves and their comparison
  • 2003
  • Ingår i: Proceedings of the 14th International Symposium on Space and Terahertz technology. ; , s. 456-475
  • Konferensbidrag (refereegranskat)abstract
    • Performance of superconductor — insulator - superconductor (SIS) tunnel junction mixers andtheir instantaneous input RF bandwidth are mostly depending on the integrated tunin g circuit used to resonate out SIS junction capacitance; Nb-based SIS mixers operate in the frequency range of about 80 - 1000 GHz and typically use microstrip-based integrated tuning circuitries.One of the major challenges in designing the tuning circuitry for SIS mixers is accuracy of models for superconducting microstrip line (SML). Modeling gives the only tool to solve the problem of designing SML-based circuits because for such high frequencies no direct measurements of a superconducting transmission line can be made with required high accuracy.However, creating an accurate model for such a superconducting transmission line is a challengeby itself. In the SML, produced usually by thin-film technology, the magnetic field penetrationdepth is comparable with the thicknesses of the dielectric and superconductors comprising theline. As a result the electromagnetic wave is propagated not only in the dielectric media but alsoinside the superconducting strip and ground electrodes constituting the SML. This createsdramatic changes in the transmission line behavior that should be carefully accounted byincluding the superconducting material properties into the modeling. Nb superconductor, as themost commonly exploited material, was used in this study for modeling of the superconductingmicrostrip though the same approach would work for any different BCS superconductingmaterial. The purpose of this paper is to introduce a new model for SML and compare it withpreviously suggested models and results of SML numerical simulation.
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Typ av publikation
konferensbidrag (59)
tidskriftsartikel (31)
doktorsavhandling (1)
licentiatavhandling (1)
Typ av innehåll
refereegranskat (77)
övrigt vetenskapligt (15)
Vassilev, Vessen, 19 ... (92)
Belitsky, Victor, 19 ... (37)
Zirath, Herbert, 195 ... (36)
Pavolotskiy, Alexey, ... (22)
Monje, Raquel, 1979 (21)
Lapkin, Igor, 1963 (21)
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Uz Zaman, Ashraf, 19 ... (18)
He, Zhongxia Simon, ... (16)
Kildal, Per-Simon, 1 ... (13)
Sundin, Erik, 1979 (12)
Risacher, Christophe ... (12)
Pantaleev, Miroslav, ... (10)
Nyström, Olle, 1979 (10)
Gunnarsson, Sten, 19 ... (9)
Desmaris, Vincent, 1 ... (9)
Dochev, Dimitar Milk ... (9)
Meledin, Denis, 1974 (9)
Hassona, Ahmed Adel, ... (9)
Vosoogh, Abbas, 1984 (8)
Kozhuharov, Rumen, 1 ... (7)
Yang, Jian, 1960 (7)
Enoksson, Peter, 195 ... (7)
Pucci, Elena, 1982 (7)
Fredrixon, Mathias, ... (7)
Ferm, Sven-Erik, 196 ... (7)
Henke, Doug, 1974 (7)
Abbasi, Morteza, 198 ... (6)
Carpenter, Sona, 198 ... (6)
Wadefalk, Niklas, 19 ... (6)
Rahiminejad, Sofia, ... (6)
Angelov, Iltcho, 194 ... (5)
Olberg, Michael, 195 ... (5)
Risacher, C. (5)
Kallfass, I. (4)
Leuther, A. (4)
Booth, Roy, 1938 (4)
Bao, Mingquang, 1962 (4)
Billade, Bhushan, 19 ... (4)
Strandberg, Magnus, ... (4)
Karandikar, Yogesh, ... (4)
Dielacher, F. (3)
Svedin, J. (3)
Lundgren, Per, 1968 (3)
Olofsson, Hans, 1952 (3)
Algaba Brazalez, Ast ... (3)
Kishk, Ahmed (3)
Haasl, Sjoerd (3)
Bergman, Per, 1960 (3)
Svensson, Magnus, 19 ... (3)
Li, Yinggang (3)
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Chalmers tekniska högskola (92)
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