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1Tokyo University of Technology; 2Kansai Photon Science Institute, National Institutes for Quantum Science and Technology; 3oining and Welding Research Institute, Osaka University
We developed a new optimization program to design a solar cavity for a solar-pumped laser. The software is based on ray tracing, and it calculates the optimal shape of the solar cavity to maximize total absorbed power into a laser medium. Results changing the co-doped density of Cr3+ in the laser medium of Cr/Nd:YAG ceramics are discussed. Although the maximum absorption efficiency of the laser medium is 0.65 when the traditional cone-shaped solar cavity and 1% of Nd3+ doped Nd:YAG is used, the optimized solar cavity with the same laser medium is expected to have 0.82 of absorption efficiency.
EFFICIENT ANALYSIS OF TWO-DIMENSIONAL RECONFIGURABLE INTELLIGENT SURFACES BY CHARACTERISTIC BASIS FUNCTIONS
Botond T. CSATHÓ1, József PÁVÓ1, Zsolt BADICS1,2, Bálint P. HORVÁTH1
1Budapest University of Technology and Economics, Hungary; 2Tensor Research, LLC, Andover, MA 01810, USA
Reconfigurable intelligent surfaces (RISs) are widely investigated as promising candidates to control and process the environment in modern high-frequency telecommunication applications. In many cases RISs are built as metasurfaces that contain concentrated parameter elements, helping with one can change the geometry of the metasurface to modify the electromagnetic (EM) wave environment according to the requirements. In this paper we present the analysis of a simple two-dimensional RIS that is able to reflect the incident EM wave in wide range of reflection angles. The analysis method used here is recently developed by the authors for the fast calculation of the EM field of metasurfaces. The applied procedure can be used for the fast evaluation of the many possible states of investigated RISs.
A W-BAND LNA USING PARALLEL COUPLED TRANSMISSION LINES
Yen-Chung CHIANG, Pin-Yi HUANG
National Chung Hsing University, Taiwan
A W-band low-noise amplifier (LNA) of four stages of common source topology is proposed in this paper. The chip was fabricated by using 90-nm CMOS process technology. It adopted parallel-coupled transmission lines between the gate terminal and the source terminal of the NMOS. Such structure was applied for optimizing among the noise, input matching and the gain. The measured results showed a peak gain of 13.15 dB at 73 GHz; a minimum noise figure of 4.83 dB at 77.5 GHz; an input P1dB of –7.3 dBm at 78 GHz, and an IIP3 of –1.1 dBm. The chip area is 0.730x0.588 mm^2, and the total power consumption is 28.14 mW under 1.2-V supply.
RESEARCH ON RIDGE REGRESSION WITH INITIAL VALUES USED FOR STRAIN MEASUREMENT IN DVC
Xiangfan SONG, Ke XIONG, Zhilin ZHAO
Nanjing University of Aeronautics and Astronautics, China, People's Republic of
A ridge regression with initial values (RR) is proposed to improve the strain measurement accuracy of Digital Volume Correlation (DVC) for full-gradient strain field. It is a combination of the advantage of power window weighted digital volume correlation (PW-DVC) and widely used pointwise least square (PLS) methods. The calculation examples of synthetic images indicate that, for image with large strain gradient, PW-DIC+RR can reduce the minimum strain error by 20.3% compared with PW-DIC+PLS, but only increase the minimum strain error by 2 microstrains compared with PW-DIC. For image with small strain gradient, PW-DIC+RR can reduce the minimum strain error by 56.7% compared with PW-DIC, but only increase the minimum strain error by 44.7 microstrains compared with PW-DIC+PLS.
