The Research On Designing And Modeling Of Embedded Components In Low-Temperature Cofired Ceramic Technology

Low Temperature Cofired Ceramic technology developed fast and became a key technology of many micro-electronics encapsulation field. The module based on LTCC has many excellent features such as design flexibility, reconfigurable structure, compactness, reliability and so on. Due to the advantages mentioned, LTCC has been used in many applications, such as medical minisize detect instruments, radio frequency and microwave module and so on.A great many of achievements has been obtained on the modeling of embedded components for LTCC in recent years, with the complexity of embedded components, the work of modeling become difficult. How to set up appropriate model and finish circuit design according to the model library is the main research aspect, while little research is reported.The thesis discusses about LTCC, manufacture and design flow of embedded passives in the LTCC firstly. Comparison between electromagnetic simulations and measurements functions in the flow of LTCC. In second part we discuss theory and process of establishing modified-T equivalent-circuit model. This model can predict the parallel, series, and ground resonant frequencies via emulator. Different inductor structures will lead to different physical performance and electric parameters. The thesis test the performance of embedded components according to theπ-equivalent circuit, finding the relationship between structure of LTCC components and quality factors, setting up LTCC components model library. The finally part, we try to design embedded bandpass filters in LTCC based on the experience of establishing basic model library for the embedded components in LTCC. The thesis employs the T-prototype to design four type the LTCC bandpass, which has many advantages on signal detecting and signal processing, the performance parameter is stable and the size is small, so that it can be used in medical detect instrucment and communication detect module.For demonstration, this thesis implements the LTCC band-pass filters which insertion loss and return loss in the passband for these LTCC filters is less than 2dB and more than 10dB, respectively. The LTCC filter can meet the standard size, respectively, which are the smallest compared to the other LTCC filters reported for similar applications in the current literature and commercial media.