Stable broadband variable noise source for microwave radiometry

Stable broadband variable noise source for microwave radiometry

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
Electronics Letters — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

A stable broadband microwave reference noise source has been designed using, as radiating elements, carbon-filament indicator lamps mounted in a waveguide. When used as a reference in an accurate radiometer, in place of a gas tube and attenuator, this source has a number of advantages. It is electronically controllable, insensitive to ambient temperature changes and the output may be set to match exactly any hot-load absolute standard of noise.


    1. 1)
      • R.H. Dicke . The measurement of thermal radiation at microwave frequencies. Rev. Sci. Instrum. , 268 - 275
    2. 2)
      • A.J. Estin , C.L. Trembath , J.S. Wells , W.C. Daywitt . Absolute measurement of temperatures of microwave noise sources. IRE Trans. , 209 - 213
    3. 3)
      • J.S. Wells , W.C. Daywitt , C.K.S. Miller . Measurement of effective temperatures of microwave noise sources. IEEE Trans. , 17 - 28
    4. 4)
      • G.J. Halford . Noise comparators and standards for S and X bands. IEEE Trans. , 310 - 317
    5. 5)
      • E.H. Ullrich , D.C. Rogers . An absolute method of measurement of receiver noise factor. J. IEE , 1347 - 1351
    6. 6)
      • Payne-Scott, R.: `A thermal noise generator for the absolute measurement of receiver noise factors at 10cm', report RP 211, Radiophysics Laboratory report, 1944.
    7. 7)
      • E.W. Collings . A filament noise source for 3 Gc/s. Proc. IEE , 97 - 101

Related content

This is a required field
Please enter a valid email address