Applications of the method in optimizing arrangement of antennas in small satellite platforms are investigated. Satellite antenna layout EMC simulation modeling, analysis and design optimization has been described in the article. Taking a LEO satellite prototype, we have established a satellite simulation model simulation model and the respective antennas, and calculate the degree of coupling b...

Silicon dioxide and silicon nitride as well as other insulating materials are used in micro-electro-mechanical systems. However, their tendency for electrostatic charging diminishes the device reliability. The charging effect becomes significant when these devices are subjected to ionizing radiation. The irradiation induced charging depends on the nature of irradiation, the underlying metal lay...

This work develops the theory of a backward-wave electron oscillator, which operates in the regime of the socalled super-radiation of short powerful rf pulses. According to simulations, the sectioning of the electron-wave interaction region can provide a significant enhancement of the power of the output rf pulse in relatively short systems.

Experiments in vhich the powers of tvo SLAC klystrons vere combined and fed into a resonant cavity pulse-compression system (SLED) are described. Pulse povers up to 65 MU into SLED vere reached. The corresponding instantaneous peak power out of SLED vas 390 MU. After normal initial aging, no persistent RF breakdown problems were encountered. X-radiation at the SLED cavities vas generally less t...

Introduction In the rapidly developing field of interventional MR, there has been growing concern about RF-induced heating in metallic devices[3]. In the work reported here, we concentrate on the RF heating of a widely used intravascular guidewire, the Terumo guidewire (Tokyo, Japan), having a nitinol (Nickel-Titanium) core. Since nitinol is not ferromagnetic, the Terumo meets an important cond...

Starting from a simple model of the double-mell semiconductor heterostructure capable of generating continuous-wave quantum "Bloch" oscillations, we have calculated analytically their major statistical properties, including spectral density and amplitude distribution. Other characteristics of the structure, pertaining to the Bloch oscillation, such as the dc I-V curve, rf impedance, and dc resp...

We have developed a quantitative theory of resonant tunneling of magnetic flux between discrete macroscopically distinct quantum states in superconducting quantum interference device systems. The theory is based on the standard density-matrix approach. Its elements include the discussion of the two different relaxation mechanisms that exist for the double-well potential, and description of the ...

The analytical and numerical calculations for the dynamic of single electron and beam in RF undulator have been conducted and compared. The transverse and longitudinal velocity, trajectory, energy variation, and the spontaneous radiation are studied. It is found that the forward and backward wave (FW/BW) components have different contribution on electron motion and radiation, most of the energy...

The real-time operation of a linac-MRI system will require proper radio frequency (RF) shielding such that the MRI images can be acquired without extraneous RF noise from the linac. We report on the steps taken to successfully shield the linac from the MRI such that the two devices can operate independently of one another. RF power density levels are reported internally and externally to the RF...

In numerical analyses of radiofrequency (RF) fields for MRI, RF power is often permitted to radiate out of the problem region. In reality, RF power will be confined by the magnet bore and RF screen enclosing the magnet room. We present numerical calculations at different frequencies for various surface and volume coils, with samples from simple spheres to the human body in environments from fre...