%0 Journal Article 
%A Díaz Morcillo, Alejandro Benedicto
%A Lozano Guerrero, Antonio José
%A Fornet Ruíz, Jaime
%A Monzó Cabrera, Juan
%T Analysis of noise temperature sensitivity for the design of a broadband thermal noise primary standard
%D 2012
%@ 0026-1394
%U http://hdl.handle.net/10317/3151
%X 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.
%K Thermal noise
%K Noise temperature
%K Broadband
%K Coaxial line
%K Primary standard
%K Microwave
%~ GOEDOC, SUB GOETTINGEN