Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Olli Luukkonen"'
Publikováno v:
Silva Fennica, Vol 57, Iss 2 (2023)
Uprooting, as a mechanical pre-commercial thinning operation (PCT), removes competitive, undesired trees with roots to prevent or reduce the need for a second PCT. The state of 66 young Norway spruce (Picea abies (L.) H. Karst.) stands was explored 3
Externí odkaz:
https://doaj.org/article/c0117176648d4ad4bdddf974628aa9a8
Autor:
Olli Luukkonen, Constantin Simovski
Publikováno v:
Optics Communications. 285:3397-3402
In this paper we suggest, numerically simulate and discuss a tapered plasmonic nanostructure which allows efficient transmission of the wave beam energy into a weakly subwavelength ( λ /4 … λ /2) spatial region within a broad frequency range. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c1c72437eee269a3363555d3776f405
https://doi.org/10.1016/j.optcom.2012.01.040
https://doi.org/10.1016/j.optcom.2012.01.040
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 11:1398-1401
Study of nonreciprocal devices has been the subject of research interest over the past several decades. In particular, gyrotropic waveguides have received considerable attention, owing to the fact that, under certain conditions, these waveguides may
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::003b519d60a95ae09b288e1a5f15b979
https://doi.org/10.1109/lawp.2012.2228151
https://doi.org/10.1109/lawp.2012.2228151
Autor:
Agostino Monorchio, Constantin Simovski, Olli Luukkonen, Filippo Costa, Sergei A. Tretyakov, P. M. de Maagt
Publikováno v:
IEEE Transactions on Antennas and Propagation. 59:3588-3596
Low-profile antennas comprising a horizontal dipole above a high-impedance surface are analyzed. The emphasis of this paper is on the additional resonances of the radiating structure caused by surface waves propagating on the high-impedance surface.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e379743c56b725885023d274df5d4f7
https://doi.org/10.1109/tap.2011.2163750
https://doi.org/10.1109/tap.2011.2163750
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 10:247-250
High-impedance surfaces (HISs) have been used as artificial magnetic conductors for low-profile dipole antennas. Usually, the desired operation has been designed using the phase-reflection simulations for normal incidence. Here, we study the properti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13bb6bf38ae056b3b5d0e3d8271c1f4e
https://doi.org/10.1109/lawp.2011.2130508
https://doi.org/10.1109/lawp.2011.2130508
Publikováno v:
IEEE Antennas and Wireless Propagation Letters. 10:1295-1298
Approaches of automated evaluation of electromagnetic material parameters have received a lot of attention in the literature. Among others, one method is to retrieve the material parameters from the reflection and transmission measurements of the sam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::77ae6ba86bcf7ba20b83c322652b2ae0
https://doi.org/10.1109/lawp.2011.2175897
https://doi.org/10.1109/lawp.2011.2175897
Autor:
Igor S. Nefedov, Constantin Simovski, Alexander B. Yakovlev, Olli Luukkonen, Sergei A. Tretyakov, Mário G. Silveirinha
Publikováno v:
Aalto University
Several recent works have emphasized the role of spatial dispersion in wire media, and demonstrated that arrays of parallel metallic wires may behave very differently from a uniaxial local material with negative permittivity. Here, we investigate usi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1cd0cf9e7ff4bd15f55356193325411d
https://doi.org/10.1109/tmtt.2009.2032458
https://doi.org/10.1109/tmtt.2009.2032458
Autor:
Constantin Simovski, Olli Luukkonen, Sergei A. Tretyakov, Alexander B. Yakovlev, Igor S. Nefedov, Mário G. Silveirinha
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 57:2700-2714
In this paper, a nonlocal homogenization model is proposed for the analysis of the spectrum of natural modes on sub-wavelength mushroom-type high-impedance surfaces composed of a capacitive grid connected to a grounded wire-medium (WM) slab. Modal ch
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bad74bdc796c6be4e218aaf72b63ee53
https://doi.org/10.1109/tmtt.2009.2031933
https://doi.org/10.1109/tmtt.2009.2031933
Broadband cloaking with volumetric structures composed of two-dimensional transmission-line networks
Publikováno v:
Microwave and Optical Technology Letters. 51:1627-1631
Keywords: transmission-line network ; scattering cross section ; eletromagnetic cloak ; Electromagnetic-Fields Reference LEMA-ARTICLE-2009-003doi:10.1002/mop.24427View record in Web of Science Record created on 2009-02-12, modified on 2016-08-08
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23ed4d9c8d84cf42c39d252f83be5a52
https://doi.org/10.1002/mop.24427
https://doi.org/10.1002/mop.24427
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 56:1624-1632
In this paper propagation properties of a parallel-plate waveguide with tunable artificial impedance surfaces as sidewalls are studied both analytically and numerically. The impedance surfaces comprise an array of patches over a dielectric slab with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8cdc9e5708a701f16749a0467ae6b25a
https://doi.org/10.1109/tmtt.2008.925236
https://doi.org/10.1109/tmtt.2008.925236