Research On X-band Oscillators Based On Substrate Integrated Waveguide Resonators

With the popularity of wireless network and its applications, such as mobile terminals, the market of wireless communications is experiencing rapid growth. Under the impetus of the market, the future wireless communication systems need to be faster data transfer rate, higher operating frequency, much more portable, lower power consumption and lower cost. Moreover, systems’ signals come from oscillation source and its role is irreplaceable. Therefore, to work in the high-performance microwave and millimeter wave oscillator is of great significance.Firstly, parallel feedback oscillator and serial feedback oscillator are analyzed based on the microwave oscillator theories, as well as the push-push oscillators using parallel feedback and serial feedback structures, respectively. Besides, the phase-noise theory of oscillators and designing methods of substrate integrated waveguide(SIW) resonators are also introduced.Secondly, an X-band parallel feedback oscillator and a center frequency of 10 GHz serial feedback voltage controlled oscillator(VCO) are designed and realized by using SIW resonators. In order to improve the performance of phase-noise, an X-band serial feedback oscillator based on active SIW resonator is proposed. And then two K-band push-push oscillators, based on serial feedback type and parallel feedback type oscillation circuits, are designed and realized to break through the restricted operating frequency of transistors.Finally, the designing methods and debugging process of phase locked loop(PLL) based on the serial feedback VCO are described in detail and the 10 GHz phase-locked frequency source is realized in the end.In this thesis, microwave oscillator theories and SIW technique, combing many kinds of electromagnetic simulators, are applied in the analyzing and designing process of oscillators and phase-locked frequency source. The final measurement results show that the expected performances have been met, which indicated its theoretical analysis is correct and design scheme is effective.