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Sökning: LAR1:lu > Sjöberg Daniel > Lunds universitet

  • Resultat 11-20 av 195
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11.
  • Bondarik, Alexander, et al. (författare)
  • Microstrip antenna array integrated with 60 GHz band CMOS injection locked power amplifier
  • 2016
  • Ingår i: 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. - 9788890701863
  • Konferensbidrag (refereegranskat)abstract
    • A microstrip antenna integration with a power amplifier is presented for the 60 GHz band. The antenna is a single layer 4×4 square patches array. The power amplifier is injection locked, designed in a 65 nm CMOS technology, with single-ended input and output signals. The integration is realized by means of bond wire connections. The antenna and the power amplifier are fabricated, characterized and measured separately. The integrated design is fabricated and measured, results are de-embedded to extract the power amplifier parameters and to compare with separate device measurements. At 56.5 GHz the integrated sample has about 12 dB gain increase with respect to the antenna sample without power amplifier. The presented design is targeting 60 GHz band wireless communication system applications.
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12.
  • Bondarik, Alexander, et al. (författare)
  • Pattern Reconfigurable Wideband Stacked Microstrip Patch Antenna for 60 GHz Band
  • 2016
  • Ingår i: International Journal of Antennas and Propagation. - : Hindawi Limited. - 1687-5869 .- 1687-5877. ; 2016
  • Tidskriftsartikel (refereegranskat)abstract
    • A beam shift method is presented for an aperture coupled stacked microstrip antenna with a gridded parasitic patch. The gridded parasitic patch is formed by nine close coupled identical rectangular microstrip patches. Each of these patches is resonant at the antenna central frequency. Using four switches connecting adjacent parasitic patches in the grid, it is possible to realize a pattern reconfigurable antenna with nine different beam directions in broadside, H-plane, E-plane, and diagonal planes. The switches are modeled by metal strips and different locations for strips are studied. As a result an increase in the antenna coverage is achieved. Measurement results for fabricated prototypes correspond very well to simulation results. The antenna is designed for 60 GHz central frequency and can be used in high speed wireless communication systems.
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15.
  • Cappellin, C., et al. (författare)
  • Design and analysis of a reflector antenna system based on doubly curved Circular Polarization Selective Surfaces
  • 2016
  • Ingår i: 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. - 9788890701863
  • Konferensbidrag (refereegranskat)abstract
    • This paper discusses the design and analysis of a reflector antenna system combining two doubly-curved Circular Polarization Selective Surfaces to provide a functionality equivalent to that of a dual gridded reflector but in circular polarization. The key feature of this design is to use a non-resonant CPSS design to avoid the bandwidth limitation of most CPSS designs previously discussed in the literature. A specific design at Ku-band is investigated and promising results are demonstrated, providing a cross-polarization discrimination higher than 25 dB over the full band.
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16.
  • Christensson, Anders, et al. (författare)
  • Association of cancer with moderately impaired renal function at baseline in a large, representative, population-based cohort followed for up to 30 years.
  • 2013
  • Ingår i: International Journal of Cancer. - : Wiley. - 0020-7136. ; 133:6, s. 1452-1458
  • Tidskriftsartikel (refereegranskat)abstract
    • Patients with chronic renal failure show a greater incidence of malignancies. We evaluated whether moderately impaired renal function at baseline influenced risk of all cancers during long-term follow in young persons. Our cohort included 33,346 subjects, aged 26-61 years at baseline, in a representative, population-based study enrolling subjects from 1974 to 1992. Median follow-up time was 28 years. Plasma creatinine was analysed as a single measure at baseline. Incident cases of cancer were identified from the Swedish Cancer Registry. We studied 24,552 subjects from the cohort. To account for the unique sampling design, participants were divided by sex and age at baseline into 1,132 older men (age 60), 14,254 younger men (age 40-52), 7,498 older women (age 47-57) and 1,688 younger women (age 35-43). Glomerular filtration rate (GFR) was estimated using the CKD-EPI formula. Patients were classified as having either normal to mildly impaired kidney function (eGFR≥60 mL/min/1.73m(2) ), or moderate kidney dysfunction (eGFR<60 mL/min/1.73m(2) ). We calculated the risk of all cancers using competing risks regression. Overall, 6,595 participants were diagnosed with cancer, and 854 subjects (3.5%) had moderately impaired renal dysfunction at baseline. There was a significant association between moderately decreased GFR and subsequent risk of kidney cancer in younger men (hazard ratio, 3.38; 95% CI, 1.48 to 7.71; P=0.004). However, we found no association with overall long-term cancer risk. Our confirmation of an association between moderately impaired renal function and risk of kidney cancer in younger men requires further exploration of high-risk groups and biological mechanisms. © 2013 Wiley Periodicals, Inc.
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18.
  • Engström, Christian, et al. (författare)
  • A Comparison of two numerical methods for homogenization of Maxwell's equations
  • 2004
  • Ingår i: Computational Electromagnetics- Methods and Applications (EMB04), Gothenburg, Sweden, October 18-19, 2004. ; , s. 50-57
  • Konferensbidrag (refereegranskat)abstract
    • When the wavelength is much larger than the typical scale of the microstructure in a material, it is possible to define effective or homogenized material coefficients. The classical way of determination of the homogenized coefficients consists of solving an elliptic problem in a unit cell. This method and the Floquet-Bloch method, where an eigenvalue problem is solved, are numerically compared with respect to accuracy and contrast sensitivity. The Floquet-Bloch method is shown to be a good alternative to the classical homogenization method, when the contrast is modest.
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