Compact Front-end Prototype for Next Generation RFI-rejecting Polarimetric L-band Radiometer

Brian Sveistrup Jensen, Sten Schmidl Søbjærg, Niels Skou, Viktor Krozer

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Realizing the need for lower noise figure and smaller physical size in todays higly sensitive radiometers, this paper presents a new compact analog front-end (AFE) for use with the existing L-band (1400-1427 MHz) radiometer designed and operated by the Technical University of Denmark. Using subharmonic sampling to sample directly at the RF-frequency, this radiometer obtains a fully polarimetric response and enables detection and removal of radio frequency interference (RFI). A more compact AFE will enable various desired features, as for example the ability to use the front-end with antenna arrays needing one receiver per antenna (Synthetic Aperture Radiometer, SARad), reduced weight for airborne missions and an easy temperature stabilization, i.e. improved instrument stability. The new front-end possesses an improved system noise temperature of only 76 K (roughly 40 K improvement) measured at an AFE physical temperature of 44oC, thus making the radiometer even more sensitive.
Original languageEnglish
Title of host publicationProceedings of the 39th European Microwave Conference
Number of pages4
Publication date2009
ISBN (Print)978-1-4244-4748-0
Publication statusPublished - 2009
Event39th European Microwave Conference - Rome, Italy
Duration: 28 Sep 20092 Oct 2009
Conference number: 39


Conference39th European Microwave Conference
Internet address

Bibliographical note

Copyright: 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


  • Radio Frequency Interference
  • Microwave radiometry
  • Sub-harmonic sampling
  • Calibration
  • Polarimetry
  • Microwave receivers


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