Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
A narrowband channel model (2.4 GHz to 2.5 GHz) for wireless sensors deployed over the external surfaces of a gas turbine engine is reported. The model is empirical and based on a series of transmission loss measurements over the surface of a gas turbine engine.
In this paper, the suitability of using a printed circuit board (PCB) microstrip patch receiving antenna for a novel application - RF energy harvesting to power a wireless soil sensor network deployed in an outdoor environment - is investigated. The performance of a conventional circular microstrip patch antenna using different microwave laminate substrates is evaluated in terms of return loss, radiation...
Wireless Sensor Networks (WSNs) which utilise IEEE 802.15.4 technology offer the potential for low cost deployment and maintenance compared with conventional wired sensor networks, enabling effective and efficient condition monitoring of aged civil engineering infrastructure. We will address wireless propagation for a below to above ground scenario where one of the wireless nodes is located in a below...
In recent years there has been a great deal of activity in the area of Wireless Sensor Networks (WSN) since this concept represents a hugely promising technology for both the present and the future. Motes, the devices which support the WSN concept, are now small enough for application in many industrial areas such as those concerning inventory control. However, as the physical size of the motes has...
Printed monopoles are suitable radiators for sensor nodes, and straightforward enablers of compact arrays. Arrays offer the advantage of diversity, which is a true enabler of mobile sensor networks. However, compact arrays with closely spaced elements become detuned and lose bandwidth, while mutual coupling hinders diversity. Prior studies described a simple and efficient technique to reduce coupling...
This paper presents both stationary and mobile signal strength measurements for a wearable UWB radio channel in a hospital environment. The measurements were made using RF-over-fibre technology to eliminate unwanted electromagnetic effects associated with the use of co-axial cables. The results show that received signal strength values depended on whether transmit and receive antennas are in relative...
This paper presents a design of an inset fed square patch array and singly fed rectangular stacked patch array operating in the 2.45 GHz ISM band for RF energy harvesting. The goal of the design is to harness and store energy from the surrounding environment which can be used in wireless sensor nodes (WSN). On the basis of simulation results obtained by FEKO simulation software, the VSWR, return loss,...
This paper presents a study of subject-specific radio channels in wireless body area networks (WBANs). The simulation tool is based on a parallel finite-difference time-domain method (FDTD) and is well suited to model radio propagations around complex, inhomogeneous objects including human bodies in WBAN. It is found from our study that radio channel characteristics in WBAN are subject specific when...
Multiple-input multiple-output (MIMO) wireless communication systems provide high capacity due to the plurality of modes available in the channel. In this paper, we investigate the achievable capacity when using such systems with body area networks (BANs). Intensive measurements in the 2.45 GHz band have been conducted on the three belt-head, belt-wrist and belt-chest on-body channels. Based on these...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.