Self-Compensation of Alignment Tolerances for Series Capacitors in LTCC Filters with Stepped Impedance Resonators

Conference: GeMIC 2008 - German Microwave Conference
03/10/2008 - 03/12/2008 at Hamburg-Harburg, Germany

Proceedings: GeMIC 2008

Pages: 4Language: englishTyp: PDF

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Höft, Michael (Panasonic Electronic Devices Europe GmbH, Zeppelinstr. 19, D-21337 Lueneburg, Germany)
Tamura, Masaya; Ishizaki, Toshio (2Panasonic Electronic Devices Co., Lt; 1006 Kadoma, Kadoma City, Osaka 571-8506, Japan)

In this paper a new self-compensation technique for series capacitors in LTCC (low temperature co-fired ceramic) filters is presented. The series capacitor is required for controlling coupling and transmission zero of the SIR (stepped impedance resonators) filter setup. The capacitor is realized by electrodes placed on two layers of the laminated multi-layer setup. Due to manufacturing tolerances in the layer alignment process, deviations are caused in the desired value of the series capacitor, which might deteriorate the filter performance. By proper shaping of the series capacitor electrodes in the connection region between the SIR, a selfcompensation of these alignment tolerances can be achieved.