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A novel wideband circularly polarized (CP) microstrip antenna with pattern improvement is proposed. Four vertical conductive walls surrounded with the radiation patch and four metal isosceles triangle patches located at top of the radiation patch are employed for widening beamwidth. To achieve the miniaturization of the antenna, four slots etched along the diagonals of radiation patch and the folded...
This paper presents a Q-band four stage power amplifier (PA) fabricated by 90nm CMOS process. In order to improve the output power of the PA, an eight-way distributed active transformer was used for power combining. The simulated insertion loss of the transformer power combiner is less than 1dB at 45 GHz. This paper also shows a way to design transformer baluns for impedance matching. The measurement...
In this paper, the ac electrical characteristics of metal oxide-based resistive random access memory are investigated based on a developed compact model and the experiment. The voltage–time dilemma phenomenon and the impacts of critical factors on resistive switching speed are addressed. Based on predictions of the model, the small parasitic capacitance, low target high resistance, and large thermal...
An automatic double-electrode submerged arc welding (SAW) system included two SAW sub-systems and one movement bogie, and each of the SAW sub-system was consisted of a power supply and a wire feeder. These devices were electrically isolated to prevent electrical and magnetic interference. A coordinate controller was needed to make these devices working coordinately and form a better welding seam....
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