In this paper, a dual-channel RF-DC microwave rectifier circuit is designed with a 2:1 power distribution ratio in a Wilkinson power splitter. The rectifier circuit works at 2.45 Ghz. After impedance matching and tuning, the structure is able to broaden the dynamic power range of the rectifier circuit while maintaining maximum rectifier efficiency. Compared with the HSMS2820 rectifier branch, this design enhances the power dynamic ranges of 60% efficiency and 50% efficiency by 4 dBm and 3 dBm, respectively. Compared with the HSMS2860 rectifier branch, for the efficiency of 60% and efficiency of 50%, the power dynamic range is expanded by 5 dBm and 2 dBm, respectively. This shows that the technology is helpful for improving the stability of energy conversion at the receiver end of microwave wireless energy transmission systems. Finally, the rationality of this conclusion is verified by establishing a mathematical model.

We present a method to simultaneously measure the temperature and electric current, which can be applied for the all-fiber optic current sensor (AFOCS) temperature compensation. The Faraday rotation mirror is introduced as the temperature sensing unit based on the all-fiber dual-modulation optic current sensor. The temperature and electric current could be distinguished by the sequence of pulse light received by the photodetector. The working principle of temperature and electric current sensing are analyzed by modeling and simulation. The experiments are designed to confirm the temperature compensation scheme. The relative error of AFOCS decreases from 14% to 2% by temperature compensation, which meets the requirements of micro-current fiber sensing.

This paper systematically analyzes the main link that imposes restrictions on the overall efficiency of the Microwave Wireless Power Transfer (MWPT) system–space transmission. Three typical transmission models of aperture transmission in the near-field area, radiation-focused transmission in the middle-field area, and Friis transmission in the far-field area of radiation were analyzed and calculated. Then, the applicable conditions and efficiency of three-models were compared. And the influence of antenna electrical parameters on the efficiency of the MWPT system was discussed. In the end, three typical space transmission models of aerial vehicles, satellites, and islands were studied. The influence of the medium on the transmission efficiency was emphatically analyzed. This paper aims to summarize the general laws of space transmission of microwave energy. Provide a theoretical reference for related scientific research and engineering practice.

The RF safe-operating-area of a variety of both bulk and thick-film SOI SiGe HBTs SiGe has been investigated using DC and pulsed-mode output characteristics, as well as RF gain and linearity measurements. SOI SiGe HBTs are found to suffer more from self-heating than bulk devices under DC operating conditions, as expected, due to their naturally higher thermal resistance. However, in terms of RF performance, operation of SiGe HBTs on SOI beyond the traditionally-defined safe-operating-area showed only minor degradation in RF metrics, and improved RF linearity. High-injection phenomena are suggested as possible explanations for the observed suppression of self-heating-induced degradation and thermal runaway in these SiGe HBTs on SOI operating under RF operating conditions.

A new method for analyzing breakdown phenomena and differentiating between damage created by hot electrons and hot holes under impact ionization induced stress within SiGe HBTs is presented. Measurements demonstrate that electrons are more effective than holes for creating impact ionization induced damage under mixed-mode stress. Lucky electrons and lucky holes can be directly observed using this approach, and the induced hot carrier current yields important insight into understanding reliability of SiGe HBTs under aggressive stress.

We investigate the size of transient artificial pores as a function of the incident laser intensity in femtosecond nearinfrared laser opto-injection into single living Bovine aortic endothelial cells (BAECs). Molecules ranging in size from 457 dalton to 500kD were used in size exclusion experiments. We found that the threshold laser intensity for pore creation was in dependence of the size of the molecule.