Microwave Oscillator Design

The work focuses on the study, design and
implementation of a C band Microwave oscillator using
coaxial resonators, for the transceiver used in wave
radar. It involves a literature study discussing
different aspects of microwave oscillators, mainly
the shielding of the oscillators, frequency pulling
due to load and supply pulling, tuning range and the
temperature performance of the oscillator. The study
of the shielding resulted in proposing a high quality
metallic shield with high elastic modulus, high
strength and high density, as the wave radar will be
a stationary, standalone system and the weight of the
shield is not a limiting factor. The metallic shield
provides better EMI and EMP performance than the
carbon ferrites. The characterization of the
resonator is critical as a small mistake pulled the
frequency about 300 MHz. This can be achieved by
careful design and measuring the resonator test
circuits for one port. The tuning range of the
oscillator is important as the temperature, bias, and
load mismatches can increase or decrease the
frequency of the oscillator. The varactor in
combination with a capacitor increases the tuning
range to about 10 times.

Autorentext

MSc Electronics/Telecommunications University of Gavle, Sweden.Currently working for Nera Networks AS, Bergen, Norway as aDesign Engineer. My fields of interests are Radio transceivers,Radio Networks, RF and Microwaves, System and module level Designof integrated circuits and MMICs.

Klappentext

The work focuses on the study, design andimplementation of a C band Microwave oscillator usingcoaxial resonators, for the transceiver used in waveradar. It involves a literature study discussingdifferent aspects of microwave oscillators, mainlythe shielding of the oscillators, frequency pullingdue to load and supply pulling, tuning range and thetemperature performance of the oscillator. The studyof the shielding resulted in proposing a high qualitymetallic shield with high elastic modulus, highstrength and high density, as the wave radar will bea stationary, standalone system and the weight of theshield is not a limiting factor. The metallic shieldprovides better EMI and EMP performance than thecarbon ferrites. The characterization of theresonator is critical as a small mistake pulled thefrequency about 300 MHz. This can be achieved bycareful design and measuring the resonator testcircuits for one port. The tuning range of theoscillator is important as the temperature, bias, andload mismatches can increase or decrease thefrequency of the oscillator. The varactor incombination with a capacitor increases the tuningrange to about 10 times.