TY - JOUR 
A1 - Díaz Morcillo, Alejandro Benedicto
AU - Lozano Guerrero, Antonio José
AU - Fornet Ruíz, Jaime
AU - Monzó Cabrera, Juan
T1 - Analysis of noise temperature sensitivity for the design of a broadband thermal noise primary standard
Y1 - 2012
SN - 0026-1394
UR - http://hdl.handle.net/10317/3151
AB - A broadband primary standard for thermal noise measurements is presented and its
thermal and electromagnetic behavior is analyzed by means of a novel hybrid
analytical-numerical simulation methodology. The standard consists of a broadband
termination connected to a 3.5mm coaxial airline partially immersed in liquid Nitrogen
and is designed in order to obtain a low reflectivity and a low uncertainty in the noise
temperature. A detailed sensitivity analysis is made in order to highlight the critical
characteristics that mostly affect the uncertainty in the noise temperature, and also to
determine the manufacturing and operation tolerances for a proper performance in the
range 10MHz–26.5GHz. Aspects such as the thermal bead design, the level of liquid
Nitrogen or the uncertainties associated to the temperatures, the physical properties of
the materials in the standard and the simulation techniques are discussed.
KW - Thermal noise
KW - Noise temperature
KW - Broadband
KW - Coaxial line
KW - Primary standard
KW - Microwave
LA - eng
PB - IOP Publishing
ER -