Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"RF Switches"”.
-
Study of the electromechanic aspects of RF MEM devices with particular emphasis on the dynamic behavior for the case of RF MEM switches and tuneable capacitors
… appealing MEMS applications are Radio Frequency (RF) switches. These devices have some outstanding advantages like low insertion loss, high isolation and linearity, but they suer from some drawbacks like low switching speed and lack of reliability. In the near future for many applications, like …
-
RF MEMS switches : survey and analysis
… attention recently as a way to produce switches. The technology leverages the fabrication instruments, processing and design techniques of the mature integrated circuit (IC) industry. While MEMS technology has shown great successes in producing commercial devices like accelerometers and …
-
High-Performance Gateless Iii-Nitride Microwave Switches
<p>Radio-frequency (RF) switches using Field-Effect Transistors (FETs) have low loss, fast switching speed, and simple fabrication process, which allows for simple integration with other components such as power amplifiers, phase shifters, arrays etc. Recent advancements in III-nitride …
-
AlGaN/GaN HFET with composite 'slow/fast' gate
… and chemical robustness. Radio Frequency (RF) switches based on such HFETs demonstrate very low insertion loss, high power handling capability and broad range of operating temperatures. </p> <p>However, the maximum operating frequency of these switches is limited by the finite off state …
-
Innovative strategies for the synthesis of Time-modulated antenna systems
… the elements of the array are modulated using RF switches. The sideband radiations have been firstly indirectly handled throughout the reduction of the sideband levels of the patterns of the harmonics by means of the minimization of a suitable cost function using a stochastic optimizer, the …
-
Transceiver Design for Ultra-Wideband Communications
… modulation is accomplished via several stages of RF switches, filters, and amplifiers on a fully designed printed circuit board specifically manufactured for this project. Critical hardware components at the receiver consist of a bank of ADCs performing parallel sampling and an FPGA employed for …
-
Reconfigurable Wideband Circularly Polarized Microstrip Patch Antenna for Wireless Applications
… circular polarization agility with wideband performance, for wireless applications are presented. First, a new technique to achieve circularly polarized (CP) probe feed single-layer microstrip patch antenna with wideband characteristics is proposed. The antenna is a modified form of the popular …
-
Design and modelling of beam steering antenna array for mobile and wireless applications using optimisation algorithms. Simulation and measrement of switch and phase shifter for beam steering antenna array by applying reactive loading and time modulated switching techniques, optimised using genetic algorithms and particle swarm methods.
… printed dipole antenna integrated with a duplex RF switch used for mobile base station antenna beam steering was investigated. A coplanar waveguide (CPW) to coplanar strip (CPS) transition was adopted to feed the printed dipole. A novel RF switch circuit, used to control the RF signal fed to the …
-
Modeling and Simulation of Microelectromechanical Systems in Multi-Physics Fields
… pull-in, and use the latter to design a novel RF-MEMS switch. In the first part of the dissertation, we introduce a new approach to the modeling and simulation of flexible microstructures under the coupled effects of squeeze-film damping, electrostatic actuation, and mechanical forces. The new …