Results 41 to 50 of about 79,732 (357)

Microwaves in Chemistry

IEEE Journal of Microwaves, 2021
The unique properties of microwaves make them useful in many diverse applications across a wide range of fields, spanning much of engineering and science. In the chemical sciences, microwaves provide a toolkit of electric and magnetic effects with which,
Daniel R. Slocombe, Adrian Porch
doaj   +1 more source

Group-delay measurement of frequency-converting devices using a comb generator

, 2010
We propose a new method for the measurement of (group) delay from the radio-frequency (RF) input to the intermediate-frequency (IF) output of a mixer or a receiver.
Scott, Jonathan B., Hoy, M.
core   +1 more source

An automated N-port network analyzer for linear and non linear multi-port RF and digital circuits [PDF]

, 1997
A new automated N-port time and frequency domain network analyzer based on the microwave transition analyzer MTA, used as a high speed digital oscilloscope, has been developed.
F. M. Ghannouchi, A. B. Kouki, Ferrero, A., N. Boulejfen, Ferrero, Andrea Pierenrico, Boulejfen, N., Kouki, A.B., Ghannouchi, F.M., Ghannouchi, Fadhel M., Kouki, A. B.   +9 more
core   +1 more source

Microwave measurements Part I: Linear Measurements [PDF]

IEEE Instrumentation & Measurement Magazine, 2007
By convention, radio frequency (RF) and microwave frequencies range between 30 MHz and 300 GHz. Conversely, this means their wavelengths range between 10 m and 1 mm. Intense research in radar development during World War II extended the RF spectrum beyond the usual applications in radio communications.
PIROLA, Marco, TEPPATI, VALERIA, CAMARCHIA, VITTORIO   +2 more
openaire   +1 more source

n+ GaAs/AuGeNi-Au Thermocouple-Type RF MEMS Power Sensors Based on Dual Thermal Flow Paths in GaAs MMIC

Sensors, 2017
To achieve radio frequency (RF) power detection, gain control, and circuit protection, this paper presents n+ GaAs/AuGeNi-Au thermocouple-type RF microelectromechanical system (MEMS) power sensors based on dual thermal flow paths.
Zhiqiang Zhang, Xiaoping Liao
doaj   +1 more source

All-Optical Pulsed Signal Doppler Frequency Shift Measurement System

IEEE Photonics Journal, 2021
A simple and all-optical Doppler frequency shift (DFS) measurement system is presented. It is based on a dual-drive Mach Zehnder modulator (DDMZM) driven by a transmitted signal and an echo signal received by an antenna.
Chongjia Huang, Erwin H. W. Chan
doaj   +1 more source

New thermocouple-based microwave/millimeter-wave power sensor MMIC techniques in GaAs

, 2010
We describe a new RF and microwave power sensor monolithic microwave integrated circuit design. The circuit incorporates a number of advances over existing designs.
Steve Cochran, Scott, Jonathan B., Bob Yeats, Jonathan B Scott, Low, T.S., T. S. Low, Keppeler, B., Ben Keppeler, Yeats, B., John Staroba, Cochran, S., Staroba, J.   +11 more
core   +1 more source

Engineered extracellular vesicles enriched with the miR‐214/199a cluster enhance the efficacy of chemotherapy in ovarian cancer

Molecular Oncology, EarlyView.
Loss of the miR‐214/199a cluster is associated with recurrence in ovarian cancer. Engineered small extracellular vesicles (m214‐sEVs) elevate miR‐214‐3p/miR‐199a‐5p in tumor cells, suppress β‐catenin, TLR4, and YKT6 signaling, reprogram tumor‐derived sEV cargo, reduce chemoresistance and migration, and enhance carboplatin efficacy and survival in ...
Weida Wang, Ayesha Alvero, Yi Qin, Mingjin Wang, Alexandra Fox, Yanfeng Li, Michael Millman, Amy Kemper, Gil Mor, Xian Shuang Liu, Michael Chopp, Zheng Gang Zhang, Yi Zhang   +12 more
wiley   +1 more source

Near-Field Microwave Imaging Method of Monopole Antennas Based on Nitrogen-Vacancy Centers in Diamond

Micromachines
Visualizing the near-field distribution of microwave field in a monopole antenna is very important for antenna design and manufacture. However, the traditional method of measuring antenna microwave near field distribution by mechanical scanning has some ...
Xuguang Jia, Yue Qin, Zhengjie Luo, Shining Zhu, Xin Li, Hao Guo   +5 more
doaj   +1 more source

Intercalibration of FY-3D MWTS Against S-NPP ATMS Based on Microwave Radiative Transfer Model

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021
Accurate and stable in-orbit radiometric calibration of a satellite instrument is fundamental to Earth geophysical parameter estimation. This article addresses the intercalibration of the microwave temperature sounder (MWTS) on the Chinese second ...
Xian-Hui Su, Geng-Ming Jiang
doaj   +1 more source