Rok 2023

• Circularly Polarized Antenna Array design with the Potential of Gain-Size Trade-off and Omnidirectional Radiation for Millimeter-Wave Small Base Station Applications

  Publikacja

  • U. Ubaid
  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - WIRELESS NETWORKS - Rok 2023

  This paper presents the design and validation of a slot-patch-hybrid circularly polarized antenna array for 28 GHz millimeter (mm) wave (mm-wave) applications. The proposed design has a simple geometry that facilitates the fabrication process, which is otherwise a challenging task due to the sub-mm dimensions of the circuit in the mm-wave band. In the proposed structure, aperture-coupled series slot-fed array is utilized to excite...

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Rok 2022

• Design of a Coplanar Waveguide-Fed Wideband Compact-Size Circularly Polarized Antenna and polarization-sense alteration

  Publikacja

  • U. Ubaid
  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • I. Mabrouk

  - WIRELESS NETWORKS - Rok 2022

  This paper presents the design and validation of a geometrically simple circularly polarized(CP) structure featuring flat gain in the sub-6 GHz 5th generation spectrum. The proposed structure is based on coplanar-waveguide-fed, modified wide slot etched in the ground plane. For generating CP waves, the coplanar ground planes are designed with slight asymmetry in both the horizontal and vertical directions. Furthermore, the ground...

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Rok 2015

• Measures of region failure survivability for wireless mesh networks

  Publikacja

  • J. Rak

  - WIRELESS NETWORKS - Rok 2015

  Wireless mesh networks (WMNs) are considered as a promising alternative to wired local, or metropolitan area networks. However, owing to their exposure to various disruptive events, including natural disasters, or human threats, many WMN network elements located close to the failure epicentre are frequently in danger of a simultaneous failure, referred to as a region failure. Therefore, network survivability, being the ability...

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Rok 2010

• Exploiting multi-interface networks: Connectivity and Cheapest Paths

  Publikacja

  • A. Kosowski
  • A. Navarra
  • C. Pinotti

  - WIRELESS NETWORKS - Rok 2010

  Let G = (V,E) be a graph which models a set of wireless devices (nodes V) that can communicate by means of multiple radio interfaces, according to proximity and common interfaces (edges E). The problem of switching on (activating) the minimum cost set of interfaces at the nodes in order to guarantee the coverage of G was recently studied. A connection is covered (activated) when the endpoints of the corresponding edge share at...

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Rok 2009

• Exploiting Multi-Interface Networks: Connectivity and Cheapest Paths

  Publikacja

  • A. Kosowski
  • A. Navarra
  • C. Pinotti

  - WIRELESS NETWORKS - Rok 2009

  Rozważano zagadnienie minimalizacji energii w sieciach bezprzewodowych bez infrastruktury, w których niektóre węzły są wyposażone w więcej, niż jeden interfejs. W przyjętym modelu sieci podano nowe algorytmy przybliżone oraz wyniki dotyczące złożoności obliczeniowej dla dwóch problemów: aktywacji najtańszej spójnej podsieci spinającej oraz aktywacji ścieżki pomiędzy ustaloną parą węzłów.

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