Development of high-performance radiometer calibration switch for millimetre waves

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Sähkötekniikan korkeakoulu | Master's thesis
Ask about the availability of the thesis by sending email to the Aalto University Learning Centre oppimiskeskus@aalto.fi

Authors

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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Citation

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-201611025258

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[dipl] Sähkötekniikan korkeakoulu / ELEC