Results 211 to 220 of about 8,642 (263)

Interconversion of Optical to Terahertz Pulses in Nonlinear Beta Barium Borate Crystal

Advanced Physics Research, EarlyView.
ABSTRACT Low‐temperature β‐phase barium borate (β‐BBO) is an important nonlinear crystal, widely utilized for optical second‐harmonic (SH) generation. Recent re‐measurements of refractive indices in the terahertz (THz) range reveal that β‐BBO is a positive uniaxial crystal.
Yingyu Guo, Boyuan Chen, Zhangshun Li, Zhiqiang Lan, Huiping Zhang, Lin Xi, Zuanming Jin, Yan Peng, Yiming Zhu   +8 more
wiley   +1 more source

A comprehensive review of metasurface-assisted direction-of-arrival estimation. [PDF]

Nanophotonics
Huang M, Li R, Zou Y, Zheng B, Qian C, Jin H, Chen H.   +6 more
europepmc   +1 more source

Harnessing Carbon‐Containing Materials for Next‐Generation High‐Temperature Electromagnetic Wave Absorbers

Carbon Energy, EarlyView.
Traditional carbon materials show limited high‐temperature oxidation resistance, which becomes pronounced above 673 K and significantly restricts their practical applicability. To address this challenge, enhancing polarization loss and leveraging its negative temperature dependence to offset the temperature‐induced increase in conductance loss are ...
Yang Li, Yuchang Qing, Wei Li, Chao Ma, Zhongyi Bai, Gang Shao, Hailong Wang, Ming Huang, Xianhu Liu, Bingbing Fan   +9 more
wiley   +1 more source

An ADPLL-Based GFSK Modulator with Two-Point Modulation for IoT Applications. [PDF]

Sensors (Basel)
Kim NS.
europepmc   +1 more source

A Wireless Implantable Closed-Loop Electrochemical Drug Delivery System. [PDF]

IEEE Trans Biomed Circuits Syst
Wang ML, Yeon P, Mofidfar M, Chamberlayne C, Xu H, Annes JP, Zare RN, Arbabian A.   +7 more
europepmc   +1 more source

Low-noise frequency synthesis and terahertz wireless communication driven by compact turnkey Kerr combs. [PDF]

Nat Commun
Jia K, Cai Y, Yi X, Qin C, Zhao Z, Wang X, Liu Y, Zhang X, Cheng S, Jiang X, Sheng C, Huang Y, Yu J, Liu H, Jin B, You X, Zhu SN, Liang W, Zhu M, Xie Z.   +19 more
europepmc   +1 more source

Detection of Communications Channels in VHF Band for Enhanced Maritime Surveillance. [PDF]

Sensors (Basel)
Lopes A, Fernandes L, Chaves P.
europepmc   +1 more source

Towards Heart Rate Estimation in Complex Multi-Target Scenarios: A High-Precision FMCW Radar Scheme Integrating HDBS and VLW. [PDF]

Sensors (Basel)
Dong X, Liu Y, Wang J, Wu S, Wang C, Tang S.   +5 more
europepmc   +1 more source

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Hardware calibration of the modulated wideband converter

2014 IEEE Global Communications Conference, 2014
In the context of Cognitive Radio (CR), opportunistic transmissions can exploit temporarily vacant spectral bands. Efficient and reliable spectrum sensing is key in the CR process. CR receivers traditionally deal with wideband signals with high Nyquist rates and low Signal to Noise Ratios (SNRs).
Etgar Israeli, Shahar Tsiper, Deborah Cohen, Eli Shoshan, Rolf Hilgendorf, Alex Reysenson, Yonina C. Eldar   +6 more
openaire   +1 more source

Wideband spectrum sensing in modulated wideband converter based cognitive radio system

2011 11th International Symposium on Communications & Information Technologies (ISCIT), 2011
Wideband spectrum sensing is a fundamental problem in cognitive radio networks. In this paper, a wideband spectrum sensing procedure which consists of four steps, i.e., coarse support recovery, fine binary detection, band edges detection and clustering, for modulated wideband converter (MWC) based cognitive radio system at sub-Nyquist rate is proposed.
Shilian Zheng, Xiaoniu Yang
openaire   +1 more source