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2,346 results on '"He, Pei"'

251. Atezolizumab versus docetaxel for patients with previously treated non-small-cell lung cancer (POPLAR): a multicentre, open-label, phase 2 randomised controlled trial

Author

Fehrenbacher, Louis, Spira, Alexander, Ballinger, Marcus, Kowanetz, Marcin, Vansteenkiste, Johan, Mazieres, Julien, Park, Keunchil, Smith, David, Artal-Cortes, Angel, Lewanski, Conrad, Braiteh, Fadi, Waterkamp, Daniel, He, Pei, Zou, Wei, Chen, Daniel S, Yi, Jing, Sandler, Alan, and Rittmeyer, Achim

Published
2016
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256. Sensitivity Enhancement in Cardio-Pulmonary Stethoscope Applications Through Artificial Magnetic Conductor-Backed Antenna Design

Author

He, Pei-Yu, Lai, Fei-Peng, and Chen, Yen-Sheng

Abstract

This paper presents an antenna for the cardio-pulmonary stethoscope (CPS) to improve sensitivity in detecting pulmonary edema. The CPS employs a dual-antenna system for monitoring the transmission coefficient. However, conventional patch antennas used in CPS setups often exhibit limited sensitivity due to frequency detuning. This study addresses this limitation through a two-stage approach. Firstly, the design goals of the CPS antenna are characterized. The results prioritize a broad impedance bandwidth, large half-power beamwidth (HPBW), and high front-to-back ratio (FBR) as key design objectives. Secondly, an antenna backed with an artificial magnetic conductor (AMC) is proposed to meet the specified goals. The fabricated prototype, operating at 2.4 GHz with an AMC size of 81.0 × 81.0 mm2, exhibits a fractional bandwidth of 27.6%, a FBR of 18.5 dB, and HPBWs of 60° and 70°. Validation is conducted using phantom models simulating different water content levels. The conventional patch antenna yields transmission coefficients between –49.6 dB and –63.5 dB; in contrast, the proposed antenna achieves transmission coefficients ranging from –35.5 dB to –45.7 dB. The sensitivities for normal and severe water contents are improved by 14.1 dB and 17.8 dB, respectively, indicating higher sensitivity and performance enhancement in CPS remote monitoring.

Published
2024
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257. Design of Compact, Broadband, 2-D Wide-Angle Scanning and Low-RCS Phased Array Using Split Ring Structures

Author

Wei, Cun Yue, Zhang, Hao Chi, Tang, Wenxuan, He, Pei Hang, Qiu, Houtong, Fang, Guangqiang, Zhang, Le Peng, Huang, Yifei, and Cui, Tie Jun

Abstract

We propose a compact wideband phased array with 2-D wide-angle scanning and low radar-cross Section (RCS) performance. The antenna elements comprise two pairs of split-ring (SR) particles and U/E-slot microstrip antennas. Specifically, the SR particles are equivalent to an antiphase metal-plate monopole array in the band to broaden the half-power beamwidth (HPBW) of the microstrip antenna. Meanwhile, the microstrip antenna functions as part of the absorbing structure out of the band to improve the absorption performance. The proposed design provides a simple and universal method to simultaneously manipulate the radiation and scattering characteristics of the microstrip antenna. In particular, an expanded checkerboard $4\times4$ array is presented and investigated using the proposed elements. Precisely, the array examination is conducted to demonstrate the good performance of a wide operating band from 6.9 to 9.3 GHz (29.6%) and wide-angle scanning up to ±60° in the E-/H-plane, and up to ±65° in the D-plane with a gain fluctuation of less than 3.5 dB. The array also achieves ultra-wideband monostatic RCS reductions in the band from 6.5 to 15 GHz (79%) for the co-polarization, and in the band from 6 to 15 GHz (85.7%) for the cross-polarization of incident waves.

Published
2024
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