Graduate Thesis Or Dissertation
 

Embedded passives in a multilayer medium

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d504rn639

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  • Recent advances in high density low cost RF and microwave three dimensional integration technologies using LTCC(Low Temperature Cofired Ceramics), laminate and other multilayer hybrid and integrated circuits have increased interest in the design of embedded passive components such as inductors, capacitors and filters. The purpose of this study is to develop the design methodology of multilayer components such as coupled line filters in a multilevel inhomogeneous medium. Although multilayer assembly including simple components have been used in the past for digital and low frequency systems, RF and microwave circuits have been fabricated mostly in single level configurations. The use of multilayer three dimensional components and circuits makes microwave circuits more compact and the design more flexible. This thesis describes the basic principles and computational procedure for the design of multilayer components such as, planar single and two-level spirals for applications as an inductive elements for RF and MICs, and coupled line band-pass filter circuits consisting of multiple sections. It is shown that both the quality factor and the inductance values can be enhanced by using multilevel spirals. Design methodology for general multisection filter consisting of asymmetric and multiple coupled lines is formulated and presented. It is shown that given the filter specifications, e.g., bandwidth, selectivity, input and output impedances, single, two and multilevel coupled line filters can be physically realized. The design procedure for narrow band filters is formulated in the conventional manner by using the equivalent circuit with admittance inverters and the component values of the low-pass prototype for Butterworth, Chebyshev and other response functions. Examples of Butterworth and Chebyshev multisection filters are included to demonstrate the design procedure. The physical multilevel filter is then optimized by using the SPICE model for coupled multiconductor lines on commercial CAD tool like LIBRA. The optimized multilevel structure design has been validated by MOMENTUM commercial electromagnetic simulator tool. The design methodology is validated by comparing the theoretical results with measurement data for a strip line filter fabricated on FR-4.
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