Stacked Chip Ltcc Microwave Filter Design And Research

With the development of mobile communication, it is a main trend to miniaturize further microwave components and devices. A primal method was to use high dielectric constant's ceramic, but it had obvious limit. The design of multilayer structure, based on the low temperature co-fired ceramics technology (LTCC), can reduce the size of components effectively, and that is a shortcut to realize components' miniaturization, integration, high reliability and low costs.Multilayer LTCC microwave filter is a new type filter, and 1980s sees its coming. While domestic scholars began researching till last years. Owing to enormous application markets of LTCC microwave filter in the future, it became the focus of many companies'competition.Not only in each horizontal layer, but also between vertical layers, there are electromagnetic couplings in multilayer LTCC microwave filter. At the same time, some mental strip-lines of different layers are interconnected by mental holes, so there are around of complex electromagnetic cross-couplings in the device. Because of using analytical closed formulation is hard to calculate exactly these couplings, we design and analyze the 3D (three dimensional) structural model of LTCC microwave filter by HFSS (High Frequency Structure Simulator). The important results and innovations are as follows:1. The design of embedded LTCC inductor and capacitor The expressions of 3D rectangle spiral inductor and VIC (Vertically Interdigitated Capacitor) capacitor in two-port admittance were analyzed and concluded. Different equivalent circuit models of 3D rectangle spiral inductor and VIC capacitor were proposed.3D structures and their each equivalent circuit models of rectangle spiral inductor and VIC capacitor had been simulated by ADS and HFSS respectively, and it was found that their each equivalent circuit models are exact enough before their each parallel resonant frequency occurred. The results showed that the equivalent circuit of inductor had maximum error 2.5dB in amplitude response and 16 degrees in phase response of...