Ka-band Frequency Of Component Design And Miniaturization

With the rapid development of millimeter-wave technology in the field of radar navigation, electronic countermeasures, remote sensing and telemetry and so on. The frequency synthesizer, as the "heart" of mm-wave system, whose performance has impact on the overall performance of system directly. Therefore, studying with good performance of spectral purity and frequency actability of mm-wave frequency source has important practical significance and value. In recent years, relying on the fast researching of high performance digital phase lock IC, based on the PLL frequency synthesizer technology is becoming the main way of mm-wave frequency synthesizer.So, in this thesis the phase noise model of the phased locked loop and a mathematical analysis model of the degradation in phase noise-to-carrier ratio of various components in the system are analyzed. Then, the advantages and disadvantages of basing on PLL technique of several common mm-wave frequecncy hybrid synthesis ways have been analyzed and compared briefly.Through the scheme of PLL with quadruples, using the Al2O3ceramic substrates thin film circuit tecnnology to design the25.4GHz frequency resurce for the local oscillator of s frequecncy conversion module. The test results show that the phase noise is better than-85dBc/Hz@10KHz, and more than-60dBc in the spurious rejection.Adopting the way of dual phase locked loop with mixer+quadrupler to achieve a low phase noise dual-channel phase coherent output microwave and millimeter wave frequency source. The test phase noise index to meet:-96dBc/Hz@10KHz (@8GHz)、-82dBc/Hz@10KHz (@35GHz), and more than60dBc in the spurious suppression.With the integration of mm-systems, small volume、good performance frequency synthesizer modules is the future trend of development. In this paper, combing the LTCC (Low-Temperrature Cofired Ceramic) technology with frequency synthesis technique, researching in the miniaturization of the frequency synthesizer.The way of double PLL and mixer frequency synthesizer module has been miniaturized. Finally, a miniature low phase-noise mm-wave phase-locked frequency synthesizer integrated in an entire LTCC substrate in the first time has been achieved. The test result demonstrates that the output frequency covers34.8GHz-35.2GHz with a minimal step of2MHz. the phase noise was better than-83dBc/Hz@10kHz; and the area of this frequency synthesizer is only42mm X49mm, which has been reduced37%compared to reference [16]. All these have indicated the superiority of the LTCC technology in the realization of the small size frequency synthesizer.In order to further improve the phase noise and spurious suppression, through the analysis of the structure of loop output signal noise influence, determining to apply the M/N and Frequency multiplication program, and have a depth study in the design of LTCC layout of the frequency synthesizer. Finally, the whole phase lock loop and the mixer frequency multiplication link have been integrated in a piece of LTCC substrate, which shows the whole substrate area of40mmx35mm. This has established the foundation for the next experiments and further improvement.