نتایج جستجو برای: loop antenna
تعداد نتایج: 173956 فیلتر نتایج به سال:
OF THE DISSERTATION Multiple Antenna Wireless Systems and Channel State Information by Dragan Samardzija Dissertation Director: Professor Narayan B. Mandayam The use of multiple antennas in wireless systems have been shown to provide tremendous capacity gains. A key factor in realizing such gains is the knowledge of the channel state information (CSI) at the receiver and transceiver. In this th...
Introduction: Clinical evidence indicates that adjuvant mild hyperthermia (41°C-43°C for 30-60 mins) of tumors significantly increases the effectiveness of radioor chemo-therapy [1-3]. It is not designed to kill cancer cells directly but instead promotes drug and oxygen (radiosensitizer) diffusion through the dilated tumor vasculature. Deep-region heating can be induced by RF electric fields ge...
Transmit antenna diversity using closed loop and open loop modes are compared in environments with line of sight propagation and spatially and temporally non-white noise. The connection between the feedback channel capacity in closed loop modes and the channel coherence time is investigated. It is shown that in LOS environments, the requirements on the feedback channel bit rate is lower. Furthe...
A wide-frequency range (50-300 kHz) power system has been implemented for use with a new RF antenna – the “Shoelace” antenna – built to drive coherent plasma fluctuations in the edge of the Alcator C-Mod tokamak. A custom, dynamically-tunable matching network allows two commercial 1 kW, 50-Ω RF amplifiers to drive the low-impedance, inductive load presented by the antenna. This is accomplished ...
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