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A new control approach for bidirectional DC-DC (BDC) converter is proposed in this paper. This approach aims at controlling a BDC in such a way that makes it behaves like a multi-level virtual conductor. As a matter of fact, the voltage difference between the terminals of any conductor is zero volts. Conversely, the main target of the proposed control approach is to keep the voltage difference between...
A planar antenna for employment in overlay and underlay ultra-wideband cognitive radio is presented in this paper. The antenna can be operated as ultra-wideband, for underlay CR and for sensing in the overlay CR. When used in the overlay CR mode, the proposed antenna can selectively have one, two or three notches in the WLAN, WiMAX, and U-NII bands, to prevent interference to primary users operating...
A polarization-reconfigurable slot antenna, for WLAN applications, is presented in this paper. The antenna incorporates a reconfigurable Wilkinson power divider-based feed network, which couples electromagnetic energy to a decagonal slot in the ground plane. The approach, presented herein, is based on electronically reconfiguring the phase difference, between the antenna's feeding ports, to achieve...
In this paper, a novel printed-circuit-board (PCB) antenna that employs electronic tunability is presented. The antenna is based on a 10 mm times 25 mm times 1.6 mm FR4-epoxy substrate, is microstrip-line fed and has a partial ground plane. The proposed antenna is designed and simulated using the Finite-Element Method (FEM) and the Method of Moments (MoM) for two different switching conditions. The...
Activities have been carried out to determine the best electrical operating conditions of GaN HEMT that enable maximum power added efficiency at L-band for switch mode power amplifiers (class F, inverse class F and class E). Satellite radio navigation applications (Galileo) are targeted. Maximization of power added efficiency is of prime importance to save DC power consumption, reduce self heating...
In this paper, a novel printed-circuit-board (PCB) antenna that employs electronic reconfigurability is presented. The antenna is based on a 1.6 mm-thick FR4-epoxy substrate with dimensions 1 cm ?? 2.5 cm, is microstrip-line fed and has a partial ground plane. The proposed antenna is designed and simulated using the Finite-Element Method (FEM) and the Method of Moments (MoM) for four different switching...
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