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Nodal sampling: a new image reconstruction algorithm for SMOS
(Institute of Electrical and Electronics Engineers (IEEE), 2016-04-01)
Article.
Accés obert
Article.
Accés obert
Soil moisture and ocean salinity (SMOS) brightness temperature (TB) images and calibrated visibilities are related by the so-called G -matrix. Due to the incomplete sampling at some spatial frequencies, sharp transitions ...
Numerical optimization of hybrid dielectric/HTS resonators for surface impedance evaluation of HTS films
(1999-06)
Article.
Accés obert
Article.
Accés obert
This work describes an alternative to the traditional dielectric resonator topology used for measuring surface impedance in high temperature superconducting (HTS) films. A gap is introduced above the dielectric so that ...
Characterization of dynamics and power handling of RF MEMS using vector measurement techniques
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004-11-30)
Article.
Accés obert
Article.
Accés obert
This paper proposes a new method to measure dynamics and power handling of RF microelectromechanical systems (MEMS) devices based on a mobile membrane. The method uses in-phase/quadrature demodulation of an RF signal ...
SMOS instrument performance and calibration after six years in orbit
(2016-07-01)
Article.
Accés obert
Article.
Accés obert
ESA's Soil Moisture and Ocean Salinity (SMOS) mission, launched 2-Nov-2009, has been in orbit for over 6 years, and its Microwave Imaging Radiometer with Aperture Synthesis (MIRAS) in two dimensions keeps working well. The ...
Direct extraction of all four transistor noise parameters from 50 noise figure measurements
(IEE, 1998-02-05)
Article.
Accés obert
Article.
Accés obert
A new method for measuring the four noise parameters (NPs) of a transistor is presented. It is based on the determination of its intrinsic noise matrix elements (C11INT, C22INT, Re(C12INT), Im(C12INT)) by fitting the ...
Splitting of Light Beams with Phase dislocations into Solitons in Quadratic Nonlinear Media
(A. Hidalgo, 1997-05-31)
Article.
Accés obert
Article.
Accés obert
We investigate the propagation of intense light beams in bulk quadratic nonlinear crystals under conditions for second-harmonic generation. We show numerically that input light beams with a spiral phase front dislocation ...
3-D printed UWB microwave bodyscope for biomedical measurements
(2019-02-15)
Article.
Accés obert
Article.
Accés obert
In this letter, a three-dimensional (3-D) printed compact ultrawideband (UWB) extended gap ridge horn (EGRH) antenna designed to be used for biological measurements of the human body is described. The operational frequency ...
Nonlinear performance of BAW filters including BST capacitors
(2014-04-01)
Article.
Accés restringit per política de l'editorial
Article.
Accés restringit per política de l'editorial
This paper evaluates the nonlinear effects occurring in a bulk acoustic wave (BAW) filter which includes barium strontium titanate (BST) capacitors to cancel the electrostatic capacitance of the BAW resonators. To do that ...
Direct identification of extended defects as vortex pinning centers in melt textured YBa2Cu3O7-Y2BaCuO5 composites
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-06-30)
Article.
Accés obert
Article.
Accés obert
Single domain YBa2Cu3O7-Y2BaCuO5 melt textured ceramic composites have revealed a very rich microstructure, which has usually impeded, by using standard measurements, to evaluate the contribution of each defect to the ...
K-band RF-MEMS uniplanar reconfigurable-bandwidth bandpass filter using multimodal immittance inverters
(Institution of Electrical Engineers, 2013-05-23)
Article.
Accés restringit per política de l'editorial
Article.
Accés restringit per política de l'editorial
A K-band RF-MEMS uniplanar second-order bandpass filter with
reconfigurable bandwidth is presented. The filter is based on inductively-coupled
half-wavelength slotline resonators and CPW-slotline
multimodal immittance ...