In order to calibrate the network analysers (which is necessary before each measurement is made), mechanical or electronic calibration kits are employed. The Physikalisch-Technische Bundesanstalt (PTB) has now established a method which enables a simple, traced back verification of a conventional network analyser calibration and, moreover, a more accurate secondary calibration.
The procedure is based on a single VNA measurement employing a high precision airline. From this measurement, the error characteristics of the VNA are determined over the entire frequency range using a sophisticated estimation procedure. Virtual experiments were used to optimally tune the parameters of the estimation procedure.
The novel calibration procedure has been confirmed by a comparison with an established but involved reference method. The novel calibration procedure now enables high-accurate calibrations of VNAs at low costs, as well as easy performance checks of mechanical calibration kits and electronic calibration units.Scientific Paper:
Erika Schow | alfa
Gecko adhesion technology moves closer to industrial uses
13.12.2017 | Georgia Institute of Technology
New silicon structure opens the gate to quantum computers
12.12.2017 | Princeton University
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
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