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1.
  • Bondarik, Alexander, et al. (författare)
  • 60 GHz Microstrip Antenna Array on PTFE Substrate
  • 2012
  • Konferensbidrag (refereegranskat)abstract
    • A microstrip antenna array design for 60 GHz central frequency is presented, with simulated and measured results in good agreement. The antenna is fabricated on a flexible substrate and intended for integration with circuit module to form a wireless communication system.
2.
  • Bondarik, Alexander, et al. (författare)
  • Gridded Parasitic Patch Stacked Microstrip Antenna With Beam Shift Capability for 60 GHz Band
  • 2014
  • Rapport (övrigt vetenskapligt)abstract
    • A microstrip antenna design is introduced in which a rectangular microstrip patch is coupled electromagnetically with a gridded rectangular patch placed above. The gridded patch consists of nine identical rectangular parts separated by a distance which is much smaller than a free space wavelength for a central frequency. The antenna is designed to operate in the 60 GHz band and is fabricated on a conventional PTFE (polytetrafluoroethylene) thin substrate. The antenna return loss bandwidth is comparable to a single parasitic patch aperture coupled antenna, while the proposed antenna gain is higher. Measurement results are in good agreement with simulation. Measured 10 dB return loss bandwidth is from 54 GHz up to 67 GHz. It fully covers the unlicensed band around 60 GHz. The measured antenna realized gain at 60 GHz is close to 8 dB, while the simulated antenna radiation efficiency is 85%. A simple beam shifting method is possible for this antenna structure by connecting adjacent outside parts in the gridded patch. The designed antenna is suitable for a high speed wireless communication system in particular for a user terminal in a fifth generation (5G) cellular network.
3.
4.
  • 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. Journal international du cancer. - WILEY-BLACKWELL. - 0020-7136 .- 1097-0215. ; 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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5.
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6.
  • Engström, Christian, et al. (författare)
  • A comparison of two numerical methods for homogenization of Maxwell's equations
  • 2004
  • Rapport (övrigt vetenskapligt)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 coeffi- cients 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.
7.
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8.
  • Engström, Christian, et al. (författare)
  • Homogenization of the Maxwell equations using Floquet-Bloch decomposition
  • 2003
  • Konferensbidrag (refereegranskat)abstract
    • Using Bloch waves to represent the full solution of the Maxwell equations inperiodic media, we study the limit process where the material's period becomes much smaller than the wavelenght. it is seen that effective material parameters can be extracted and explicity represented in terms of the non-vanishing Bloch waves, providing an alternative means of homogenization.
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9.
  • Engström, Christian, et al. (författare)
  • Numerical methods for homogenization of Maxwell's equations
  • 2004
  • Ingår i: URSI 2004 International Symposium on Electromagnetic Theory. - Pisa Univ. - 88-8492-252-6 - 9788884922526 ; s. 987-989
  • 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. Two numerical methods for the determination of the homogenized coefficients are compared. Numerical examples, where extreme properties of the effective material are achieved in the two dimensional case, are presented
10.
  • Engström, Christian, et al. (författare)
  • On two numerical methods for homogenization of Maxwell's equations
  • 2007
  • Ingår i: Journal of Electromagnetic Waves and Applications. - VSP BV. - 0920-5071. ; 21:13, s. 1845-1856
  • Tidskriftsartikel (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. Moreover, we provide numerical bounds on the effective permittivity. 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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