Development of high-performance radiometer calibration switch for millimetre waves

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Sähkötekniikan korkeakoulu | Master's thesis
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Date
2016-10-31
Department
Major/Subject
Radio Science and Engineering
Mcode
ELEC 3038
Degree programme
EST_3
Language
en
Pages
8+69
Series
Abstract
In microwave remote sensing radiometers, calibration switches are needed in the application of internal calibration references. Very low insertion loss is beneficial in view of low receiver noise and good radiometric resolution (ΔT). Low insertion loss can be achieved with ferrite junction switches. In developing millimetre wave ferrite junction switches, however, the small dimensions of the ferrite become a challenge. Targeting towards W band (89 GHz), two frequency-scaled switches at Ka band (36.5 GHz) have been developed and manufactured in the current work. One of the switches applies higher order mode operation, resulting in larger ferrite dimensions. A reference switch to apply dominant mode operation has been developed as well. Through the development of two Ka band ferrite switches, the feasibility of both dominant mode and higher order mode operation switches has been confirmed, and relatively good compliance between electromagnetic simulations and measurement results is observed. The switches have average insertion losses of 0.85 dB and 0.3 dB over 1.0 GHz and 4.7 GHz, respectively.
Description
Supervisor
Räisänen, Antti
Thesis advisor
Lahtinen, Janne
Keywords
ferrite switch, radiometer, calibration, higher order modes
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