Modeling And Application Of LTCC Passive Components

With the advanced development of the mobile communication technology, higher performance of the Radio Frequency (RF) devices in the communication equipments is required. The RF devices will develop in the direction of miniaturization, low cost, high frequency and high stability based on the Low Temperature Co-fired Ceramic (LTCC) technology. This dissertation is about the passive components modeling and application based on LTCC technology. The main content of this dissertation includes:Firstly, the characteristics of LTCC technology are given, taking the LTCC filter designing for example, the design principles and process are given in detail.Secondly, based on LTCC capacitance characteristics, the single-Ï€equivalent circuit model of the lumped capacitance is established and the parameter extraction expressions are listed. The equivalent circuit model is verified by Designed 2.5pF and 1.36pF of VIC lumped capacitors.Thirdly, the LTCC inductor structure and the inductor performance curves in pace with the physical structure parameters varying are listed. The LTCC inductor equivalent circuits of the single-Ï€and double-Ï€patterns are modeled. The 3.5-turns of 3nH rectangular spiral inductor simulation verifies with the equivalent single-Ï€circuit model. Meanwhile, the comparison between the S-parameters of the single-Ï€and double-Ï€are carried out.Finally, the LTCC band-pass filter of 2.45GHz center frequency and 360MHz bandwidth is designed. By comparing the two S-parameters of simulation by HFSS and ADS, which can prove the established passive component equivalent circuit model is correct.In this dissertation, double-Ï€equivalent circuit model of planar rectangular spiral inductor is significant for studying and designing the complexity LTCC inductor.