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AbstPact An on-chip fdter using monolithic transformer that can be integrated on a Si substrate is presented. The new filter topology has been fabricated using Motorola 0.18 micron copper process. Measurement results show significant improvement in Q of the present design compared to the inductor implementation. The size and Q advantages of the new topology can be useful in cost sensitive consumer products.

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.

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