A5042236704- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Pulsed Power Technology Applications
- Antenna Design and Analysis
- Radio Frequency Integrated Circuit Design
- Electromagnetic Simulation and Numerical Methods
- Advanced Research in Systems and Signal Processing
- GNSS positioning and interference
- Electromagnetic Compatibility and Noise Suppression
- Advanced Antenna and Metasurface Technologies
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Magnetic Field Sensors Techniques
- Power Line Communications and Noise
- Electrostatic Discharge in Electronics
- Advanced Thermodynamics and Statistical Mechanics
- Particle Accelerators and Free-Electron Lasers
- Millimeter-Wave Propagation and Modeling
University of Rome Tor Vergata
2020-2024
High Power Microwave (HPM) sources are widely used as signal in radar, jammer, and Counter Improvised Explosive Devices (CIED). Such devices usually heavy bulky, characteristics that conflict with the small weight power (SWaP) approach so it is practically impossible to mount such HPMs on several platforms reduced spaces (e.g., avionic, UAVs). During last century, have been proposed, all of them due components they need magnetic material Magnetron, Klystron, or Gyrotron. Considering HPM for...
This paper outlines an innovative approach to design a spatial power-combining structure based on waveguide polarizers. It presents the 3D CAD model of new with transversal probes and considerations in positioning optimization them. Exploiting transformation dominant input mode TE10 into elliptically polarized wave, provided by polarizer, it has been possible achieve division power eight, completely carried out space. With insertion made microstrips, RF signal can be sent MMIC solid state...
This paper outlines the design characterization and electromagnetic performance of a millimeter-wave high power combining structure, which exploits spatial combination technique.The input matching is always below 10 dB over entire Q band, overall weight structure about 500 g.Multiphysics simulations show how this suitable for most challenging space missions that will arise in next few years.In fact, 100 W RF above frequency 40 GHz can be delivered while all specifications satellite payloads...
Abstract Due to the disadvantages of vacuum tubes in terms warm-up time, size, and high-voltage needs, solid-state power amplifiers (SSPAs) with gallium nitride (GaN) monolithic microwave integrated circuits (MMICs) are key solution for levels up some kilowatts continuous wave. An SSPA is most convenient these RF due its low weight, small negligible low-voltage operation, high reliability. Spatial (SPAs) combining techniques best candidates SSPAs intrinsic attenuation dividing functions....
This paper outlines a novel approach to design waveguide microstrip Finline transition, that allows division by three of the RF power traveling inside rectangular waveguide. The possibility obtaining and odd microwave millimeter wave signals with such transition is completely unexplored yet harbinger great opportunities. Starting from 3D CAD model structure continuing Electromagnetic simulations, obtained results describe able achieve an almost perfect splitting three. Multyphisics show...
The size and weight of a high power microwave (HPM) source can make difference in strategic use. compactness the virtual cathode oscillator (vircator) is undoubtedly most significant advantage this device. Civil industry agriculture use it to treat objects, food, soils for disinfestation disinfection. Vircators could also generate electromagnetic pulses (EMPs) force arrest vehicles drones; EMPs inhibit or activate improvised explosive devices (IEDs). coaxial type vircator highly compact Due...
An S-band multistage axial virtual cathode oscillator with efficiency enhancement for high pulsed power electromagnetic applications is presented. The Particle-in-Cell (PIC) results of the designed 5-stage Vircator, two-step negative tapering in reflectors, carried out by CST Studio suite 2021 simulation code show a peak value 5.54 GW and an 13.65% at 2.45 GHz, under beam voltage current equal to 520 kV 20 kA, respectively.
A novel spatial power combiner (SPC), exploiting nonbinary and odd divisions working in full Ka-band, is designed measured this letter. Starting from the theory that rules division captured by waveguide-to-microstrip transitions with different factors, a 3-D EM model has been created simulated along manufactured prototype. The measurements demonstrated how all broadband transmission characteristics of Finline ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract In the framework of Compact Light XLS project [1], a Ka-band linearizer with electric field ranging from 100 to 150 MV/m is requested [2, 3, 4]. order feed this structure, proper high power klystron amplifier efficiency needed. This paper reports possible solution for operating on TM 010 mode at 36 GHz, third harmonic 12 GHz linac frequency, an 44% and 10.6 MW radiofrequency output power. We discuss also here high-power DC gun related magnetic focusing system, RF beam dynamics...
In this article an innovative method of studying and removing the resonances, inherently exhibit by some waveguide to microstrip transitions, is presented. By modeling equivalent circuit, new approach allows obtain constructive parameters a finline transition, only using values resistance capacitance components circuit. This procedure will allow small microwave design Companies realize these transitions implementing circuit analysis software, not having afford electromagnetic which are very...
In the framework of Divertor Tokamak Test (DTT) facility, which aims at validation an integrated solution for power exhaust moving to DEMOnstration plant (DEMO), Ion Cyclotron Resonance Heating (ICRH) system is under development. Its final configuration, comprises two independent modules, shall couple 6 MW DTT plasma, in a pulsed regime (pulse length 50 s, duty cycle 1.4%), 60–90 MHz frequency range. The Vacuum Feedthrough (VFT), usually made with one or alumina windows, assures reliable...
This paper presents the Multiphysics Analysis of a High-Power Microwave Window for Ka-Band Klystron providing 16MW peak power. After optimization electromagnetic performances, we analyze effect RF heating and stress pressure on window. We also multipactor effect, that is common cause window failure. Using such approach, it possible to realize virtual prototype capable represent in complete way real be manufactured.
Magnetically Insulated transmission Line Oscillator (MILO) is a relatively new High Power Microwave (HPM) device that has recently received increasing attention because it does not require an external magnetic field and can generate gigawatt (GW) of power from L to Ku bands. Furthermore, compact lightweight tube operate at low impedance <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(\sim 10\ \Omega)$</tex> . The most significant element in...