This paper presents the analysis, modeling, and measurements of a novel configuration of spiral inductors and transformers to enhance the figure of merits. The present configuration utilizes a Z-shaped multilayer metalization to increase the Q of the monolithic inductors, and increase K without sacrificing the Q of the monolithic transformers. A simple two-port lumped-circuit model derived from inductor S-parameters is used to illustrate the potential of the new design. Several on-chip transformers have been fabricated using the Motorola 0.18-micron copper process. The experimental data shows good agreement with predicted data obtained using the HFSS software simulator. A noticeable increase of mutual coupling and Q is achieved. The transformer can be optimized to achieve high Q or high K or both.

This paper presents novel multilayer tuneable highQ-filters based on hairpin resonators including ferroelectric materials. This configuration allows the miniaturization of these filters to a size that makes them suitable for chip and package integration and narrow-band applications. The main focus was miniaturizing filters with coupled loops using multilayer dielectric substrates. A further goal was to increase the quality factor of these distributed filters by embedding high dielectric materials in a multilayer high- and low-k(dielectric constant) substrate that is supported by LTCC technology. An improved W-shape bandpass filter was proposed with a wide stopband and approximately 5% bandwidth.