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  • Küçük Resim
    Öğe
    Efficient Deployment of Energy Antenna for Sensor Nodes with RF Charging
    (2019) Zorlu, Ahmet; Kosunalp, Selahattin; Tabakcıoğlu, Mehmet Barış
    A sensor node has processor, antenna, sensor and energy units. A large number of sensor nodes generates wireless sensor network (WSN). The main problem of WSN is limited-energy. A great number of MAC protocols are introduced to compensate the energy problem. In order to supply energy to sensor nodes, an external solar panel, wind turbine and energy harvester are added to the architecture of the nodes. Moreover, wireless energy transfer is used to meet the energy problem of sensor node. Position, height and operating frequency of energy antenna is so important to charge the sensor nodes efficiently. In this study, ray theoretical models are used to calculate the electric field and generate the coverage map. As the energy antenna is deployed to optimum place, charging will complete in a short time.
  • Küçük Resim Yok
    Öğe
    Medium Access Control Protocols for Wireless Sensor Networks with Ambient Energy
    (Ieee, 2016) Kosunalp, Selahattin; Tabakcıoğlu, Mehmet Barış
    Wireless sensor networks (WSNs) have recently been a popular research area with a broad range of applications. One of the most significant constraints of WSNs is energy limitation of sensor nodes. Therefore, energy-efficiency has been considered as primarily design criterion in many medium access control (MAC) protocols developed. In order to solve the issue of limited-energy sources, various recent protocols have focused on energy harvesting from surrounding environment, such as solar, wind and vibration energy, resulting in providing unlimited energy source. Ambient energy exhibits a characteristic of unlimited energy source but not available always due to environmental changes. The focus is now being placed on effective utilization of the time-varying ambient energy. This study aims to provide a review of recently proposed MAC protocols for energy-harvesting WSNs describing their operating principles and underlying features.