Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Roshanak Zabihi"'
Autor:
Roshanak Zabihi, Rodney G. Vaughan
Publikováno v:
IEEE Open Journal of Antennas and Propagation, Vol 1, Pp 104-112 (2020)
Propagation analysis and modeling is critical for radio systems design, but remains a challenge for most through-vegetation situations, including forests. Transmission through such inhomogeneous mixed media is complicated by the many different propag
Externí odkaz:
https://doaj.org/article/0cbe3a12d5c04c80a962821814c36dba
Publikováno v:
IEEE Transactions on Antennas and Propagation. 69:7771-7781
Coverage in mobile communications systems requires an acceptable link gain over a maximum service area, with areas of low link gain being problematic. A standard approach to maximize link gain is to deploy multiple-input–multiple-output (MIMO) ante
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a82e391a1275e1f1e7e706643be1f3fb
https://doi.org/10.1109/tap.2021.3076194
https://doi.org/10.1109/tap.2021.3076194
Publikováno v:
IEEE Transactions on Antennas and Propagation. 69:6273-6283
Waveguide arrays comprise slot radiators cut into hollow, single-mode, standing wave structures. Their impedance bandwidth and compactness are limited by the waveguide cutoff. By using the TEM mode of a coaxial waveguide, a more compact structure wit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d165aa233031b85e8c6132a66cffc86f
https://doi.org/10.1109/tap.2021.3070121
https://doi.org/10.1109/tap.2021.3070121
Publikováno v:
2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f75f34837fe76c7b41f66f117184fef7
https://doi.org/10.1109/aps/ursi47566.2021.9704660
https://doi.org/10.1109/aps/ursi47566.2021.9704660
Autor:
Roshanak Zabihi, Rodney G. Vaughan
Publikováno v:
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS).
A simple empirical model for long distance through-foliage propagation is presented. It comprises two parallel propagation mechanisms: direct transmission through a line of trees modelled by a simple linear transmission line; and along the free-space
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69435b8e1798594740fb04fcf710d0dd
https://doi.org/10.23919/ursigass51995.2021.9560420
https://doi.org/10.23919/ursigass51995.2021.9560420
Publikováno v:
2020 XXXIIIrd General Assembly and Scientific Symposium of the International Union of Radio Science.
Diffraction describes propagation into a shadow region, showing increasing attenutation with frequency. This behaviour is relevant to 5G systems where the mmwave frequencies have reduced coverage in non-line-of-sight areas of an urban environment. He
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97e85b0baf0f67c1192e817e33d02082
https://doi.org/10.23919/ursigass49373.2020.9232202
https://doi.org/10.23919/ursigass49373.2020.9232202
Publikováno v:
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting.
For ever-increasing demand for communication capacity, carrier frequencies are increasing, but this brings greater shadowing which compromises the radio coverage. For example, mmWave signals are severely attenuated in the simplest of non-line-of-sigh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9558d364960622660183bdf4decfea2
https://doi.org/10.1109/ieeeconf35879.2020.9330310
https://doi.org/10.1109/ieeeconf35879.2020.9330310
Publikováno v:
2020 14th European Conference on Antennas and Propagation (EuCAP).
Diffraction formulations have infinite boundaries whereas simulations are solved with strictly limited dimensions. Consequently, the simulation of diffraction effects is challenging. Here, 3D electromagnetic simulations are described and compared aga
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60331956fcd0567ee75550018e82f058
https://doi.org/10.23919/eucap48036.2020.9135989
https://doi.org/10.23919/eucap48036.2020.9135989
Publikováno v:
VTC-Fall
The use of extra slots in a slotted waveguide array for improving the impedance bandwidth is investigated. This has not been widely studied previously, probably because the directive pattern is a primary parameter for the waveguide array and extra el
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7a533f3bc39e90ab0a8837138329e4e
https://doi.org/10.1109/vtcfall.2019.8891329
https://doi.org/10.1109/vtcfall.2019.8891329
Publikováno v:
VTC-Fall
The slot array antenna is used for pattern- critical applications including satellite communications and radar. In most mobile communications antennas, the pattern detail at the mobile terminal is not critical because of the distributed target of a m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79f73705f46dabc851af7a7233aaafc5
https://doi.org/10.1109/vtcfall.2019.8891100
https://doi.org/10.1109/vtcfall.2019.8891100