Results 71 to 80 of about 735,881 (338)

A Real-Time Millimeter-Wave Phased Array MIMO Channel Sounder

, 2017
In this paper, we present a novel real-time MIMO channel sounder for 28 GHz. Until now, the common practice to investigate the directional characteristics of millimeter-wave channels has been using a rotating horn antenna.
Bas, C. Umit, Henige, Thomas, Molisch, Andreas F., Monroe, Robert, Park, Jeongho, Psychoudakis, Dimitris, Wang, Rui, Zhang, Jianzhong   +7 more
core   +1 more source

Time-Delay Multiplexing of Two Beams in a Terahertz Imaging Radar [PDF]

, 2010
We demonstrate a time-delay multiplexing technique that doubles the frame rate of a 660–690-GHz imaging radar with minimal additional instrument complexity.
Bryllert, Tomas, Chattopadhyay, Goutam, Cooper, Ken B., Dengler, Robert J., Llombart, Nuria, Siegel, Peter H.   +5 more
core   +1 more source

Wideband H‐plane dielectric horn antenna

IET Microwaves, Antennas & Propagation, 2017
By flaring a dielectric waveguide in the H ‐plane, an H ‐plane dielectric horn is formed, which could be directly excited by an SIW feed. However, matching and radiation performances are poor due to the thinness of the substrate.
Wang, Lei, Garcia-Vigueras, Maria, Alvarez-Folgueiras, Marcos, Mosig, Juan R.   +3 more
openaire   +3 more sources

Photonic Time Crystals and Time‐Varying Electromagnetic Metamatter: A New Direction for Ultrafast Tunable Photonic and Microwave Materials and Devices

Advanced Science, EarlyView.
Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel, Shriram Ramanathan, Ronald P. Jenkins, Michael J. Carter   +3 more
wiley   +1 more source

A Simple Approach to Select the Optimum Design Frequency for Pyramidal Horn Antenna Design

The Journal of Engineering
In this paper, a simple procedure is proposed to select the optimum design frequency for the horn antenna design by combining theory and simulation. The gain of horn antennas often increases and the aperture efficiency decreases while the frequency of ...
Abolfazl Azari, Hadi Aliakbarian
doaj   +1 more source

Gain measurements of standard electromagnetic horns in the kappa and kappa alpha bands [PDF]

Gain measurements of standard electromagnetic horn antennas for use in calibrating millimeter wave, parabolic radio ...
Wrixon, G.
core   +1 more source

Comparison of Focused and Near-Field Imaging of Spray on Foam Insulation (SOFI) at Millimeter Wave Frequencies [PDF]

, 2007
Millimeter wave imaging techniques can provide high spatial-resolution images of various composites. Lens antennas may be incorporated into the imaging system to provide a small incident beam footprint.
Hepburn, F. L., Kharkovshy, S., Zoughi, R.   +2 more
core   +2 more sources

ARCADE: Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission [PDF]

, 2006
The Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE) is a balloon-borne instrument designed to measure the temperature of the cosmic microwave background at centimeter wavelengths.
A. Kogut, Bartlett, Burigana, Burigana, D. Fixsen, E. Wollack, Fixsen, Fixsen, Fixsen, Fixsen, Fornengo, Gnedin, Gush, Haiman, J. Singal, Jungman, Kogut, Kogut, L. Lowe, M. Limon, M. Seiffert, Mather, Oh, P. Lubin, P. Mirel, S. Fixsen, S. Levin, Singal, Sunyaev, Valle, Zeld´ovich   +30 more
core   +2 more sources

Remote Activation of Spinal TRPV1 by Magnetic Nanocubes Confers Cardioprotection Against Myocardial Ischemia‐Reperfusion Injury

Advanced Science, EarlyView.
Fe‐based magnetic nanocubes conjugated with TRPV1 antibodies (FeNCs‐TRPV1) are developed for the specific targeting of TRPV1 channels. Intraspinally injected FeNCs‐TRPV1 induces TRPV1 desensitization in rats exposed to repetitive and transient ACMF.
Xueying Cheng, Shuangyu Liu, Yu Zhang, Kang Peng, Muge Qile, Chao Wu, Mengyun Dou, Liu Liu, Na Yang, Rui Liu, Guiyang Zhang, Liangping Ni, Gaolin Liang, Fang Yang, Ye Zhang, Shufang He   +15 more
wiley   +1 more source

Machine Learning Driven Window Blinds Inspired Porous Carbon‐Based Flake for Ultra‐Broadband Electromagnetic Wave Absorption

Advanced Science, EarlyView.
Inspired by the regulation mechanism of window blinds, this study designs an electromagnetic wave‐absorbing metamaterial. By introducing the magneto‐electric coupling concept and integrating it with an artificial intelligence‐based data‐driven collaborative optimization strategy, the material optimizes impedance matching performance and enhances loss ...
Zhe Wang, Wanchong Li, Lu Feng, Zaiqing Yang, Shicheng Jin, Dongxu Zhao, Xiaoyong Wu, Yan Wang, Yu Mao, Jinsong Zhang   +9 more
wiley   +1 more source