Via-only microwave/millimeter wave bandpass filters for LTCC applications Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pk02cc786

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  • With an increasing number of wireless applications at microwave frequencies, the frequency spectrum is becoming quite crowded. Due to this congestion, the current state of technology is leading towards upper microwave and millimeter wave spectra as they also offer other distinct advantages such as larger bandwidth and smaller component footprint. Low temperature co-fired ceramic (LTCC) has become an enabling technology for a variety of wireless applications at microwave frequencies, as it provides cost-effective, high-density solutions suitable for high-volume production. With the advent of new materials and improved processing techniques, wide range of high quality multi-layered embedded passive components is viable in this technology. Multi chip module (MCM) technology, low-temperature co-fired ceramic (LTCC) has gained extensive popularity over recent years. Interesting features such as tunable dielectric properties, lower dielectric loss and multi-layer realization have given LTCC an edge in the realization of wide-range of embedded passive components. The existing passive component topologies realized in planar configurations such as multi-layered microstrip and stripline offer effective implementation in LTCC for frequencies up to 20 GHz. Conventionally, for frequencies beyond 20 GHz, conducting waveguide based passive components have distinct advantages over planar counterparts in terms of better insertion losses, lower tolerance sensitivities and availability of wide range of analytical techniques. Application of waveguide concepts to a multi-layered technology such as LTCC, can be quite useful as this can effectively blend in the advantages from both sides to realize new configurations of passive components with improved characteristics. However, as frequency increases, the design complexity increases due to the associated parasitics and one requires accurate analytical procedures combined with effective synthesis techniques for efficient modeling of components to meet a given set of specifications. With a large number of electromagnetic solvers available today, synthesis depends on a tradeoff between time and accuracy. Reduction in synthesis time combined with accurate analysis presents an ideal scenario, which any designer would aspire for. This work attempts to resolve some of the above mentioned problems by proposing new waveguide based bandpass filter topologies in LTCC. The work focuses on bandpass filter configurations as they are the most popular passive components and are extensively used for a variety of applications. Field theory based accurate analysis combined with impedance-inverter based synthesis techniques have been developed for designing the proposed configurations. The accuracy of the analysis depends on its uniqueness to consider interactions among high order evanescent modes in a rectangular waveguide. The proposed design procedure can be applied to synthesize wide range of waveguide based bandpass filter configurations. The novelty of these configurations lies in the fact that they can be realized only by using a series of vias. Several issues related to physical realization of these filters are discussed. A detailed sensitivity analysis has been carried out to understand the behavior of the proposed structures. The proposed new filter configurations have been validated with commercially available 3D full-wave electromagnetic simulation tools. This research on new configurations of efficient bandpass filter realization should prove useful for a wide range of applications in the frequency range of 12 to 40 GHz.
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